CN113188929B - Method for testing impact strength of metal welded pipe fitting joint - Google Patents
Method for testing impact strength of metal welded pipe fitting joint Download PDFInfo
- Publication number
- CN113188929B CN113188929B CN202110413922.5A CN202110413922A CN113188929B CN 113188929 B CN113188929 B CN 113188929B CN 202110413922 A CN202110413922 A CN 202110413922A CN 113188929 B CN113188929 B CN 113188929B
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- field coil
- annular
- pipe fitting
- tested
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002184 metal Substances 0.000 title claims description 16
- 229910052751 metal Inorganic materials 0.000 title claims description 16
- 238000004021 metal welding Methods 0.000 claims abstract description 89
- 230000006698 induction Effects 0.000 claims description 18
- 238000003466 welding Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000009864 tensile test Methods 0.000 description 11
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 239000004917 carbon fiber Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910000976 Electrical steel Inorganic materials 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000013077 target material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/317—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by electromagnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Electromagnetism (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A method for testing the impact strength of a metal welding pipe fitting joint comprises a first constant magnetic field coil and a second constant magnetic field coil, wherein the first constant magnetic field coil and the second constant magnetic field coil are used for generating a radial constant magnetic field at the end part of the metal welding pipe fitting to be tested; first and second pulsed magnetic field coils for generating induced eddy currents at ends of the metal welding pipe fitting to be tested; first and second ring-shaped yokes for constituting a constant magnetic field magnetic circuit; the sections of the first and the second ring-shaped magnetic yokes are rectangular frame-shaped with gaps; annular through grooves are formed in the middle of the first pulse magnetic field coil and the second pulse magnetic field coil; the annular through groove type annular magnetic yoke is provided with a gap corresponding to the gap; the upper end of the upper half part of the metal welding pipe fitting to be tested is positioned in the gap of the first annular magnetic yoke; the lower end of the lower half part of the metal welding pipe fitting to be tested is positioned in the gap of the second annular magnetic yoke. The invention can provide uniform unidirectional stretching pulse electromagnetic force for the metal welding pipe fitting to be tested; meanwhile, by changing the pulse width of electromagnetic force, loading with different strain rates can be realized.
Description
Technical Field
The invention belongs to the field of metal material testing, and particularly relates to a method for testing the impact strength of a metal welding pipe fitting joint.
Background
The quality of the metal welded pipe fitting joint directly influences the mechanical performance of the whole part, and the impact strength of the metal welded pipe fitting joint can be verified by carrying out unidirectional tensile impact strength test on the metal welded pipe fitting joint. Then, in the existing unidirectional tensile test, mechanical force loading is adopted, and the following problems exist: stress concentration exists at the mechanical clamping force application points, so that the unidirectional tensile test result can be influenced; the loading speed is low, and the unidirectional tensile impact strength under high strain rate cannot be simulated, which belongs to quasi-static loading.
The Chinese patent (CN 106424176A) discloses a large-size metal welding pipe fitting stretching method, which adopts a round groove body on an auxiliary groove to ensure that the two ends of the metal welding pipe fitting are not easy to deform the part of the metal welding pipe fitting which is not provided with the auxiliary groove in the process of beating and tightening. However, with mechanical loading, stress concentrations at the clamping points are unavoidable.
The Chinese patent (CN 105403457B) discloses a method for testing the tensile property of a carbon fiber reinforced resin-based thin-wall composite pipe fitting, which comprises the steps of preparing a mechanical tensile test piece of the carbon fiber reinforced resin-based thin-wall composite pipe fitting by adopting a cementing connection technology instead of a mechanical connection technology, designing a transfer clamp to clamp the tensile test piece on a mechanical testing machine, loading the tensile test piece, and finally obtaining a damage load and a corresponding deformation value. The invention solves the problem that the existing mechanical property test method of the carbon fiber reinforced resin matrix composite pipe is not suitable for the thin-wall composite pipe, and by adopting the novel tensile test piece preparation method, the problem that the pipe is damaged by a metal joint caused by mechanical connection is avoided, and provides a novel test method for the carbon fiber thin-wall composite pipe. However, this method is only applicable to carbon fiber materials, and is not applicable to metal welded pipe fittings.
The Chinese patent (CN 102109436B) provides an electromagnetic impact dynamic tensile test method and device, wherein a tensile test piece passes through a central hole of an electromagnetic pulse device, the electromagnetic pulse device excites a strong pulse magnetic field, and electromagnetic force is generated between a target material and an electromagnetic pulse coil, so that the tensile test piece arranged between the target material and a bracket obtains direct instant tensile force, and the dynamic tensile test of the tensile test piece is completed. However, this method is not suitable for electromagnetic force application of metal welded pipe.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for testing the impact strength of a joint of a metal welding pipe fitting, which can provide uniform unidirectional stretching pulse electromagnetic force for the metal welding pipe fitting to be tested; because no clamping point exists, the stress concentration phenomenon of the clamping point does not exist; meanwhile, by changing the pulse width of electromagnetic force, loading with different strain rates can be realized.
The technical scheme adopted by the invention is as follows:
an apparatus for testing impact strength of a metal welded pipe fitting joint, comprising:
the first constant magnetic field coil and the second constant magnetic field coil are used for generating a radial constant magnetic field at the end part of the metal welding pipe fitting to be tested;
the first pulse magnetic field coil and the second pulse magnetic field coil are used for generating induced eddy currents at the end part of the metal welding pipe fitting to be tested;
a first annular magnetic yoke and a second annular magnetic yoke for forming a constant magnetic field magnetic circuit;
the first and second ring-shaped magnetic yokes comprise a cavity, the sections of the first and second ring-shaped magnetic yokes are rectangular frame-shaped with gaps, the gaps of the first ring-shaped magnetic yoke are arranged at the lower side, and the gaps of the second ring-shaped magnetic yoke are arranged at the upper side;
the first constant magnetic field coil is positioned at the upper part of the first annular magnetic yoke cavity, and the second constant magnetic field coil is positioned at the lower part of the second annular magnetic yoke cavity; the constant magnetic field coil is connected with a direct current power supply;
the first pulse magnetic field coil is positioned at the lower part of the first annular magnetic yoke cavity, and the second pulse magnetic field coil is positioned at the upper part of the second annular magnetic yoke cavity; the pulse magnetic field coil is connected with a pulse power supply;
annular through grooves are formed in the middle of the first pulse magnetic field coil and the second pulse magnetic field coil; annular through grooves of the first pulse magnetic field coil and the second pulse magnetic field coil respectively correspond to gaps formed in the first annular magnetic yoke and the second annular magnetic yoke;
the upper end of the upper half part of the metal welding pipe fitting to be tested is positioned in the gap of the first annular magnetic yoke; the lower end of the lower half part of the metal welding pipe fitting to be tested is positioned in the gap of the second annular magnetic yoke.
The inner annular edge of the gap of the first annular magnetic yoke is 0.2-0.5mm smaller than the inner diameter of the upper half part of the metal welding pipe fitting to be tested, and the outer annular edge of the gap of the first annular magnetic yoke is 0.2-0.5mm larger than the outer diameter of the upper half part of the metal welding pipe fitting to be tested; the inner annular edge of the gap of the second annular magnetic yoke is 0.2-0.5mm smaller than the inner diameter of the lower half part of the metal welding pipe fitting to be tested, and the outer annular edge of the gap of the second annular magnetic yoke is 0.2-0.5mm larger than the outer diameter of the lower half part of the metal welding pipe fitting to be tested.
The first and the second ring type magnetic yokes are formed by laminating insulating silicon steel sheets with the thickness of 0.2 mm.
The inner annular edge of the annular through groove of the first pulse magnetic field coil is 0.2-0.5mm smaller than the inner diameter of the upper half part of the metal welding pipe fitting to be tested, and the outer annular edge of the gap of the annular through groove of the first pulse magnetic field coil is 0.2-0.5mm larger than the outer diameter of the upper half part of the metal welding pipe fitting to be tested; the inner annular edge of the annular through groove of the second pulse magnetic field coil is 0.2-0.5mm smaller than the inner diameter of the lower half part of the metal welding pipe fitting to be tested, and the outer annular edge of the gap of the annular through groove of the second pulse magnetic field coil is 0.2-0.5mm larger than the outer diameter of the lower half part of the metal welding pipe fitting to be tested.
The ratio of the number of turns of the first pulse magnetic field coil to the number of turns of the second pulse magnetic field coil is equal to the ratio of the inner diameter of the lower half part of the metal welding pipe fitting to be tested to the inner diameter of the upper half part of the metal welding pipe fitting to be tested.
A method for testing the impact strength of a metal welded pipe fitting joint,
placing a first constant magnetic field coil in the upper area of the cavity of the first annular magnetic yoke, and placing a second constant magnetic field coil in the lower area of the cavity of the second annular magnetic yoke; placing a first pulse magnetic field coil in the first annular magnetic yoke, and aligning an annular through groove of the first pulse magnetic field coil with a gap of the first annular magnetic yoke; placing a second pulse magnetic field coil in the second annular magnetic yoke, and aligning the annular through groove of the second pulse magnetic field coil with the gap of the second annular magnetic yoke;
placing the upper end of the upper half part of the metal welding pipe fitting to be tested in a gap of a first annular magnetic yoke, and placing the lower end of the lower half part of the metal welding pipe fitting to be tested in a gap of a second annular magnetic yoke;
the first constant magnetic field coil, the first pulse magnetic field coil, the metal welding pipe fitting to be tested, the second constant magnetic field coil, the second pulse magnetic field coil, the first annular magnetic yoke and the second annular magnetic yoke are overlapped in central axis;
a direct current power supply is adopted to supply power to the first constant magnetic field coil and the second constant magnetic field coil which are connected in series, and a radial constant magnetic field is generated in a gap of the annular magnetic yoke;
a pulse power supply is adopted to supply power to the first pulse magnetic field coil and the second pulse magnetic field coil which are connected in series, pulse current and a changed magnetic field are generated, and the changed magnetic field generates circumferential induction eddy current in the metal welding pipe fitting to be tested;
the radial constant magnetic field interacts with the annular induction eddy current to generate axial pulse electromagnetic force;
the upper end of the upper half part of the metal welding pipe fitting to be tested is subjected to upward axial electromagnetic force, and the lower end of the lower half part of the metal welding pipe fitting to be tested is subjected to downward axial electromagnetic force at the same time, so that the impact strength test of the welding joint is completed.
The radial outward constant magnetic field acts with the clockwise annular induction eddy current to generate upward axial electromagnetic force; or the radially inward constant magnetic field acts with the counter-clockwise circumferentially induced eddy currents to generate an upward axial electromagnetic force.
The radial outward constant magnetic field acts with the counter-clockwise annular induction eddy current to generate downward axial electromagnetic force; or the radial inward constant magnetic field and the clockwise annular induction vortex act to generate downward axial electromagnetic force.
The pulse current of the pulse magnetic field coil is regulated, so that the loading of different electromagnetic forces and strain rates can be realized.
The invention relates to a device and a method for testing the impact strength of a joint of a metal welding pipe fitting, which have the advantages that:
1. the uniform unidirectional stretching pulse electromagnetic force can be provided for the metal welding pipe fitting to be tested;
2. because no clamping point exists, the stress concentration phenomenon of the clamping point does not exist;
3. meanwhile, by changing the pulse width of electromagnetic force, loading with different strain rates can be realized.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic 2/3 cross-sectional view of an apparatus for testing the impact strength of a metal welded pipe fitting joint.
Fig. 2 is a schematic diagram of the pulse current of the pulsed magnetic field coil.
Wherein:
1.1-a first constant magnetic field coil and 1.2-a second constant magnetic field coil;
2.1-a first pulsed magnetic field coil, 2.2-a second pulsed magnetic field coil; 2.3-annular through slots of the first pulsed magnetic field coil; 2.4-annular through slots of the second pulsed magnetic field coil.
3.1-a first annular magnetic yoke, 3.2-a second annular magnetic yoke; 3.3-gap;
4-pulse power supply;
5-direct current power supply;
6.1-upper half part of the metal welding pipe fitting to be tested, 6.2-lower half part of the metal welding pipe fitting to be tested, and 6.3-welding joint; 7-pulse current of the pulse magnetic field coil.
Detailed Description
An apparatus for testing impact strength of a metal welded pipe fitting joint, comprising:
a first constant magnetic field coil 1.1 and a second constant magnetic field coil 1.2 for generating a radial constant magnetic field at the end part of the metal welding pipe fitting to be tested;
a first pulse magnetic field coil 2.1 and a second pulse magnetic field coil 2.2 for generating induced eddy currents at the end of the metal welding pipe fitting to be tested;
a first annular magnetic yoke 3.1 and a second annular magnetic yoke 3.2 for forming a constant magnetic field magnetic circuit.
The first and second ring-shaped magnetic yokes comprise a cavity, the sections of the first and second ring-shaped magnetic yokes are rectangular frame-shaped with gaps, the gaps of the first ring-shaped magnetic yoke 3.1 are arranged at the lower side, and the gaps of the second ring-shaped magnetic yoke 3.2 are arranged at the upper side;
the first constant magnetic field coil 1.1 is positioned at the upper part of the cavity of the first annular magnetic yoke 3.1, and the second annular magnetic yoke 3.2 is positioned at the lower part of the cavity of the first annular magnetic yoke 3.1; the constant magnetic field coil is connected with a direct current power supply 5; the first constant magnetic field coil and the second constant magnetic field coil have consistent geometric parameters and are connected in series to provide direct current by a direct current power supply 5.
The first pulse magnetic field coil 2.1 is positioned at the lower part of the cavity of the first annular magnetic yoke 3.1, and the second pulse magnetic field coil 2.2 is positioned at the upper part of the cavity of the second annular magnetic yoke 3.2; the pulse magnetic field coil is connected with a pulse power supply 4. The first and second pulse magnetic field coils are connected in series, and pulse current is supplied by a pulse power supply 4.
The first constant magnetic field coil is a conventional coil wound with copper wire, and the geometry is limited in such a way that the first constant magnetic field coil can be placed inside the rectangular frame-shaped cavity of the first ring-shaped yoke 3.1 at the same time.
The second constant magnetic field coil is a traditional coil, is wound by copper wires, and has a geometric dimension limited by being capable of being placed in the rectangular frame-shaped cavity of the second annular magnetic yoke 3.2 simultaneously with the second pulse magnetic field coil.
The first pulsed magnetic field coil is a conventional coil wound from copper wire, and the geometry is limited in that it can be placed inside the rectangular frame-shaped cavity of the first annular yoke 3.1 simultaneously with the first constant magnetic field coil.
The second pulsed magnetic field coil is a conventional coil wound from copper wire, and the geometry is limited in such a way that it can be placed inside the rectangular frame-shaped cavity of the second ring-shaped yoke 3.2 simultaneously with the second constant magnetic field coil.
The pulse power supply 4 employs a pulse capacitor 100uF.
The dc power supply 5 employs a dc battery 400V.
Annular through grooves are formed in the middle of the first pulse magnetic field coil and the second pulse magnetic field coil; the annular through grooves of the first pulse magnetic field coil and the second pulse magnetic field coil respectively correspond to the gaps formed by the first annular magnetic yoke and the second annular magnetic yoke.
The upper end of the upper half part 6.1 of the metal welding pipe fitting to be tested is positioned in the gap of the first annular magnetic yoke 3.1; the lower end of the lower half part 6.2 of the metal welding pipe fitting to be tested is positioned in the gap of the second annular magnetic yoke 3.2.
The inner annular edge of the gap of the annular magnetic yoke is 0.2-0.5mm smaller than the inner diameter of the metal welding pipe fitting to be tested, and the outer annular edge of the gap of the annular magnetic yoke is 0.2-0.5mm larger than the outer diameter of the metal welding pipe fitting to be tested.
The annular through groove is formed in the middle of the first pulse magnetic field coil, so that an axial space is reserved when the upper half part 6.1 of the metal welding pipe fitting to be tested stretches upwards, and meanwhile, the radial electromagnetic force can be reduced as far as possible because the annular through groove is positioned in the middle of the winding of the first pulse magnetic field coil; the annular through groove is formed in the middle of the second pulse magnetic field coil, so that an axial space is reserved when the lower half part 6.2 of the metal welding pipe fitting to be tested stretches downwards, and meanwhile, the annular through groove is positioned in the middle of the winding of the second pulse magnetic field coil, so that radial electromagnetic force can be reduced as far as possible.
The upper end of the upper half part 6.1 of the metal welding pipe fitting to be tested is positioned in the gap of the first annular magnetic yoke 3.1; the lower end of the lower half part 6.2 of the metal welding pipe fitting to be tested is positioned in the gap of the second annular magnetic yoke 3.2, so that the radial constant magnetic field is large enough to generate enough axial electromagnetic force; the annular edge at the inner side of the gap of the annular magnetic yoke is 0.2-0.5mm smaller than the inner diameter of the metal welding pipe fitting to be tested, and the annular edge at the outer side of the gap of the annular magnetic yoke is 0.2-0.5mm larger than the outer diameter of the metal welding pipe fitting to be tested, so that the metal welding pipe fitting to be tested has enough moving space in the gap, and the metal welding pipe fitting to be tested is free of contact and friction.
The first and the second ring type magnetic yokes are formed by laminating insulating silicon steel sheets with the thickness of 0.2 mm. The first and second ring magnetic yokes can be made to have no induced eddy current, so that loss is reduced. The cost of the silicon steel sheet is increased when the thickness is too thin, and the loss is increased when the thickness is too thick.
The inner annular edge of the annular through groove is 0.2-0.5mm smaller than the inner diameter of the metal welding pipe fitting to be tested, and the outer annular edge of the clearance of the annular magnetic yoke is 0.2-0.5mm larger than the outer diameter of the metal welding pipe fitting to be tested. In order to obtain enough moving space in the gap for the metal welding pipe fitting to be tested, the metal welding pipe fitting has no contact and no friction.
In order to ensure that the downward axial electromagnetic force and the upward axial electromagnetic force keep the constraint given by equal magnitude and opposite directions. The ratio of the number of turns of the first pulsed magnetic field coil 2.1 to the number of turns of the second pulsed magnetic field coil 2.2 is equal to the ratio of the inner diameter of the lower half 6.2 of the metal welding pipe to be tested to the inner diameter of the upper half 6.1 of the metal welding pipe to be tested.
A method for testing the impact strength of a metal welding pipe fitting joint is characterized in that a first constant magnetic field coil 1.1 is arranged in the upper area of a cavity of a first annular magnetic yoke 3.1, and a second constant magnetic field coil 1.2 is arranged in the lower area of a cavity of a second annular magnetic yoke 3.2; the first pulse magnetic field coil 2.1 is arranged inside the first annular magnetic yoke 3.1, and the annular through groove of the first pulse magnetic field coil is aligned with the gap of the first annular magnetic yoke 3.1; placing the second pulsed magnetic field coil 2.2 inside the second annular magnetic yoke 3.2 with its annular through slot aligned with the gap of the second annular magnetic yoke 3.2;
the upper end of the upper half part 6.1 of the metal welding pipe fitting to be tested is placed in the gap of the first annular magnetic yoke 3.1, and the lower end of the lower half part 6.2 of the metal welding pipe fitting to be tested is placed in the gap of the second annular magnetic yoke 3.2;
the first constant magnetic field coil 1.1, the first pulse magnetic field coil 2.1, the upper half part 6.1 of the metal welding pipe fitting to be tested, the welding joint 6.3, the lower half part 6.2 of the metal welding pipe fitting to be tested, the second pulse magnetic field coil 2.2 and the first pulse magnetic field coil 2.1 are sequentially arranged from top to bottom; and their central axes coincide;
a direct current power supply is adopted to supply power to the first constant magnetic field coil and the second constant magnetic field coil which are connected in series, and a radial constant magnetic field is generated in a gap of the annular magnetic yoke;
a pulse power supply is adopted to supply power to the first pulse magnetic field coil and the second pulse magnetic field coil which are connected in series, pulse current and a changed magnetic field are generated, and the changed magnetic field generates circumferential induction eddy current in the metal welding pipe fitting to be tested;
the radial constant magnetic field interacts with the annular induction eddy current to generate axial pulse electromagnetic force;
the upper end of the upper half part 6.1 of the metal welding pipe fitting to be tested is subjected to upward axial electromagnetic force, and the lower end of the lower half part 6.2 of the metal welding pipe fitting to be tested is subjected to downward axial electromagnetic force at the same time, so that the impact strength test of the welding joint 6.3 is completed.
The radial outward constant magnetic field acts with the clockwise annular induction eddy current to generate upward axial electromagnetic force; or the radially inward constant magnetic field acts with the counter-clockwise circumferentially induced eddy currents to generate an upward axial electromagnetic force. F=j×b, and the direction is determined by the left hand rule.
The radial outward constant magnetic field acts with the counter-clockwise annular induction eddy current to generate downward axial electromagnetic force; or the radial inward constant magnetic field and the clockwise annular induction vortex act to generate downward axial electromagnetic force. F=j×b, and the direction is determined by the left hand rule.
The pulse current of the pulse magnetic field coil is regulated, so that the loading of different electromagnetic forces and strain rates can be realized. F=j×b. The magnitude of the axial electromagnetic force applied to the metal welding pipe fitting to be tested is determined by a radial constant magnetic field and a circumferential induction vortex. At the moment, the magnitude of the pulse current of the pulse magnetic field coil is adjusted, and the magnitude of the axial electromagnetic force applied to the metal welding pipe fitting to be tested can be changed, so that the loading of different electromagnetic forces is realized; the pulse width of the pulse current of the pulse magnetic field coil is regulated, so that the pulse width of the axial electromagnetic force applied to the metal welding pipe fitting to be tested can be changed, and the loading of the strain rate is realized;
examples:
as shown in fig. 1, a first constant magnetic field coil 1.1 is arranged in the upper area of the cavity of a first annular magnetic yoke 3.1, and a second constant magnetic field coil 1.2 is arranged in the lower area of the cavity of a second annular magnetic yoke 3.2;
placing the first pulsed magnetic field coil 2.1 in the lower region of the cavity of the first annular magnetic yoke 3.1, and aligning the annular through groove with the gap of the first annular magnetic yoke 3.1;
placing the second pulsed magnetic field coil 2.2 inside the second annular magnetic yoke 3.2 with its annular through slot aligned with the gap of the second annular magnetic yoke 3.2;
the upper end of the upper half part 6.1 of the metal welding pipe fitting to be tested is placed in the gap of the first annular magnetic yoke 3.1, and the lower end of the lower half part 6.2 of the metal welding pipe fitting to be tested is placed in the gap of the second annular magnetic yoke 3.2;
the first constant magnetic field coil 1.1, the first pulse magnetic field coil 2.1, the upper half part 6.1 of the metal welding pipe fitting to be tested, the welding joint 6.3, the lower half part 6.2 of the metal welding pipe fitting to be tested, the second pulse magnetic field coil 2.2 and the first pulse magnetic field coil 2.1 are sequentially arranged from top to bottom; and their central axes coincide;
a direct current power supply is adopted to supply power to the first constant magnetic field coil and the second constant magnetic field coil which are connected in series, and a radial constant magnetic field is generated in a gap of the annular magnetic yoke; a pulse power supply is adopted to supply power to the first pulse magnetic field coil and the second pulse magnetic field coil which are connected in series to generate a pulse current 7 and a changed magnetic field, and the changed magnetic field generates a circumferential induction vortex in the metal welding pipe fitting to be tested; the interaction of the radial constant magnetic field and the annular induction vortex generates axial pulse electromagnetic force; the upper end of the upper half part 6.1 of the metal welding pipe fitting to be tested is subjected to upward axial electromagnetic force, and the lower end of the lower half part 6.2 of the metal welding pipe fitting to be tested is subjected to downward axial electromagnetic force at the same time, so that the impact strength test of the welding joint 6.3 is completed.
Impact strength, namely the maximum load which can be borne by the metal welding pipe fitting to be tested under the impact load, and the weakest link of the metal welding pipe fitting to be tested is a welding joint; in the method, pulse electromagnetic force is applied to two ends of the metal welding pipe fitting to be tested, and the maximum electromagnetic force which can be born by the welding joint is observed to determine the impact strength of the metal welding pipe fitting.
Claims (4)
1. A method for testing the impact strength of a metal welded pipe fitting joint, characterized by: the first constant magnetic field coil (1.1) is arranged in the upper area of the cavity of the first annular magnetic yoke (3.1), and the second constant magnetic field coil (1.2) is arranged in the lower area of the cavity of the second annular magnetic yoke (3.2); placing a first pulsed magnetic field coil (2.1) inside a first annular magnetic yoke (3.1), and aligning an annular through groove (2.3) of the first pulsed magnetic field coil with a gap of the first annular magnetic yoke (3.1); placing a second pulsed magnetic field coil (2.2) inside the second annular magnetic yoke (3.2) and aligning the annular through groove (2.4) of the second pulsed magnetic field coil with the gap of the second annular magnetic yoke (3.2); the gap of the first annular magnetic yoke (3.1) is arranged at the lower side, and the gap of the second annular magnetic yoke (3.2) is arranged at the upper side; the upper end of the upper half part (6.1) of the metal welding pipe fitting to be tested is placed in the gap of the first annular magnetic yoke (3.1), and the lower end of the lower half part (6.2) of the metal welding pipe fitting to be tested is placed in the gap of the second annular magnetic yoke (3.2);
the first constant magnetic field coil (1.1), the first pulse magnetic field coil (2.1), the upper half part (6.1) of the metal welding pipe to be tested, the welding joint (6.3), the lower half part (6.2) of the metal welding pipe to be tested, the second pulse magnetic field coil (2.2), the second constant magnetic field coil (1.2), the first annular magnetic yoke (3.1) and the second annular magnetic yoke (3.2) are overlapped in central axis, and the first constant magnetic field coil (1.1), the first pulse magnetic field coil (2.1), the upper half part (6.1) of the metal welding pipe to be tested, the welding joint (6.3), the lower half part (6.2) of the metal welding pipe to be tested, the second pulse magnetic field coil (2.2) and the second constant magnetic field coil (1.2) are sequentially arranged from top to bottom;
the ratio of the number of turns of the first pulse magnetic field coil (2.1) to the number of turns of the second pulse magnetic field coil (2.2) is equal to the ratio of the inner diameter of the lower half part (6.2) of the metal welding pipe fitting to be tested to the inner diameter of the upper half part (6.1) of the metal welding pipe fitting to be tested;
a direct current power supply is adopted to supply power to the first constant magnetic field coil and the second constant magnetic field coil which are connected in series, and a radial constant magnetic field is generated in a gap of the annular magnetic yoke;
a pulse power supply is adopted to supply power to the first pulse magnetic field coil and the second pulse magnetic field coil which are connected in series, pulse current and a changed magnetic field are generated, and the changed magnetic field generates circumferential induction eddy current in the metal welding pipe fitting to be tested;
the radial constant magnetic field interacts with the annular induction eddy current to generate axial pulse electromagnetic force;
the upper end of the upper half part (6.1) of the metal welding pipe fitting to be tested is subjected to upward axial electromagnetic force, and the lower end of the lower half part (6.2) of the metal welding pipe fitting to be tested is subjected to downward axial electromagnetic force at the same time, so that the impact strength test of the welding joint (6.3) is completed.
2. A method for testing the impact strength of a metal welded pipe fitting joint according to claim 1, wherein: the radial outward constant magnetic field acts with the clockwise annular induction eddy current to generate upward axial electromagnetic force; or the radially inward constant magnetic field acts with the counter-clockwise circumferentially induced eddy currents to generate an upward axial electromagnetic force.
3. A method for testing the impact strength of a metal welded pipe fitting joint according to claim 1, wherein: the radial outward constant magnetic field acts with the counter-clockwise annular induction eddy current to generate downward axial electromagnetic force; or the radial inward constant magnetic field and the clockwise annular induction vortex act to generate downward axial electromagnetic force.
4. A method for testing the impact strength of a metal welded pipe fitting joint according to claim 1, wherein: the pulse current of the pulse magnetic field coil is regulated, so that the loading of different electromagnetic forces and strain rates can be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110413922.5A CN113188929B (en) | 2019-03-18 | 2019-03-18 | Method for testing impact strength of metal welded pipe fitting joint |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110413922.5A CN113188929B (en) | 2019-03-18 | 2019-03-18 | Method for testing impact strength of metal welded pipe fitting joint |
| CN201910205189.0A CN109946181B (en) | 2019-03-18 | 2019-03-18 | Device and method for testing impact strength of metal welding pipe fitting joint |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910205189.0A Division CN109946181B (en) | 2019-03-18 | 2019-03-18 | Device and method for testing impact strength of metal welding pipe fitting joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113188929A CN113188929A (en) | 2021-07-30 |
| CN113188929B true CN113188929B (en) | 2024-03-29 |
Family
ID=67008403
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110413922.5A Active CN113188929B (en) | 2019-03-18 | 2019-03-18 | Method for testing impact strength of metal welded pipe fitting joint |
| CN201910205189.0A Active CN109946181B (en) | 2019-03-18 | 2019-03-18 | Device and method for testing impact strength of metal welding pipe fitting joint |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910205189.0A Active CN109946181B (en) | 2019-03-18 | 2019-03-18 | Device and method for testing impact strength of metal welding pipe fitting joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN113188929B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855432B (en) * | 2020-07-20 | 2021-03-30 | 华中科技大学 | Device and method for testing stress-strain curve of titanium alloy material under high-temperature high-strain rate |
| CN112792202A (en) * | 2020-12-14 | 2021-05-14 | 三峡大学 | Device and method for improving forming uniformity of light alloy pipe fitting |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU934301A1 (en) * | 1980-06-09 | 1982-06-07 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Горной Геомеханики И Маркшейдерского Дела | Device for tensile testing of specimens |
| DE3334570A1 (en) * | 1983-09-24 | 1985-04-11 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München | DEVICE FOR DETECTING THE START OF A CRACK IN A BREAK MECHANICAL SAMPLE |
| JPS62228132A (en) * | 1986-03-28 | 1987-10-07 | Shimadzu Corp | Material tester |
| WO1999065636A1 (en) * | 1998-06-14 | 1999-12-23 | Pulsar Welding Ltd. | Inducing physical changes in metal objects |
| KR20030045358A (en) * | 2001-12-03 | 2003-06-11 | 주식회사 포스코 | Method for grain oriented electrical steel sheet with low magnetostriction by magnetic field-heating treatment to use pulse magnetic field with DC magnetic field and magnetic flux-heating treatment appartus used therein |
| CN103586324A (en) * | 2013-10-30 | 2014-02-19 | 华中科技大学 | Electromagnetic internal stress shape adjusting method for metal plate |
| CN105728541A (en) * | 2016-04-28 | 2016-07-06 | 华中科技大学 | Coil-free electromagnetic-pulse forming device and method of metal plates |
| CN206523367U (en) * | 2017-01-19 | 2017-09-26 | 北京东方德兴科技有限公司 | A kind of high-speed tester (HST) |
| EP3392643A1 (en) * | 2015-12-18 | 2018-10-24 | Northwestern Polytechnical University | Electromagnetic induction type hopkinson tension-compression bar loading device and experiment method |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100825298B1 (en) * | 2006-09-28 | 2008-04-25 | 국방과학연구소 | Apparatus for measuring impact induced tensile-fracture |
| CN102109436B (en) * | 2010-12-24 | 2013-10-23 | 江苏大学 | Electromagnetic impact dynamic tensile test method and device |
| CN102944474B (en) * | 2012-11-29 | 2014-11-05 | 哈尔滨工业大学 | High-speed one-way tensile test method |
| CN203459492U (en) * | 2013-08-05 | 2014-03-05 | 三峡大学 | Radial-axial two-way loading type metal pipe fitting electromagnetic forming device |
| CN103406418B (en) * | 2013-08-05 | 2015-01-07 | 三峡大学 | Method and device for electromagnetically forming metal pipe fitting in radial and axial loading mode |
| RU2613618C1 (en) * | 2015-11-19 | 2017-03-21 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет" (СПбГУ) | Testing device of constructional materials for dynamic tension |
| CN206925192U (en) * | 2017-03-06 | 2018-01-26 | 华中科技大学 | A kind of electromagnetic forming device of metal tube |
| CN107030172B (en) * | 2017-05-12 | 2018-08-21 | 华中科技大学 | A kind of electromagnetic casting method and device based on tubing under background magnetic field |
| CN206990351U (en) * | 2017-07-12 | 2018-02-09 | 河北工业大学 | Metal electromagnetism loading system based on lorentz force |
| CN116511328A (en) * | 2017-11-08 | 2023-08-01 | 三峡大学 | Pipe fitting non-contact flanging device without arranging inside pipe fitting |
| CN108469379A (en) * | 2018-06-13 | 2018-08-31 | 三峡大学 | A kind of contactless Tensile Strength of Rock test device based on electromagnetic principle |
-
2019
- 2019-03-18 CN CN202110413922.5A patent/CN113188929B/en active Active
- 2019-03-18 CN CN201910205189.0A patent/CN109946181B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU934301A1 (en) * | 1980-06-09 | 1982-06-07 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Горной Геомеханики И Маркшейдерского Дела | Device for tensile testing of specimens |
| DE3334570A1 (en) * | 1983-09-24 | 1985-04-11 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München | DEVICE FOR DETECTING THE START OF A CRACK IN A BREAK MECHANICAL SAMPLE |
| JPS62228132A (en) * | 1986-03-28 | 1987-10-07 | Shimadzu Corp | Material tester |
| WO1999065636A1 (en) * | 1998-06-14 | 1999-12-23 | Pulsar Welding Ltd. | Inducing physical changes in metal objects |
| KR20030045358A (en) * | 2001-12-03 | 2003-06-11 | 주식회사 포스코 | Method for grain oriented electrical steel sheet with low magnetostriction by magnetic field-heating treatment to use pulse magnetic field with DC magnetic field and magnetic flux-heating treatment appartus used therein |
| CN103586324A (en) * | 2013-10-30 | 2014-02-19 | 华中科技大学 | Electromagnetic internal stress shape adjusting method for metal plate |
| EP3392643A1 (en) * | 2015-12-18 | 2018-10-24 | Northwestern Polytechnical University | Electromagnetic induction type hopkinson tension-compression bar loading device and experiment method |
| CN105728541A (en) * | 2016-04-28 | 2016-07-06 | 华中科技大学 | Coil-free electromagnetic-pulse forming device and method of metal plates |
| CN206523367U (en) * | 2017-01-19 | 2017-09-26 | 北京东方德兴科技有限公司 | A kind of high-speed tester (HST) |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113188929A (en) | 2021-07-30 |
| CN109946181B (en) | 2021-05-14 |
| CN109946181A (en) | 2019-06-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113188929B (en) | Method for testing impact strength of metal welded pipe fitting joint | |
| CN109967593B (en) | Device and method for achieving electromagnetic bulging axial compression of pipe fitting by adopting radial constant magnetic field and induced eddy current | |
| JP6422994B2 (en) | Rolled iron core main transformer for vehicles | |
| JP5743446B2 (en) | Method for manufacturing solenoid magnet coil and solenoid magnet coil | |
| US8436506B2 (en) | Electric motor assemblies and systems and methods associated with joining wires of electric motor assemblies | |
| CN107931948B (en) | The prosthetic device and method of micro-crack in a kind of non-ferromagnetic metal pipe fitting | |
| CN103555915B (en) | Device for performing heat treatment correction on titanium alloy spoke structure welded case | |
| CN109946182B (en) | Pulse force loading device and method suitable for sheet metal biaxial tension test | |
| CN106026556B (en) | A kind of assembled piece type motor stator integrally spells round method | |
| CN113340730B (en) | Pulse force loading method suitable for unidirectional tensile test of metal pipe fitting | |
| CN103831578A (en) | Magnetic pulse forming equipment and method for connecting dissimilar metal rod and metal plate structural member | |
| WO2013078845A1 (en) | Single phase transformer | |
| CN202344113U (en) | Device for local demagnetization | |
| CN107192758B (en) | Energy-saving eddy current flaw detection magnetic saturation device | |
| Isono et al. | Fabrication of an insert to measure performance of ITER CS conductor | |
| CN109888969A (en) | A kind of rotor based on hollow shaft structure | |
| CN104319082A (en) | Reactor | |
| CN110085394B (en) | Double-opening magnetic circuit I-shaped iron core column clamping and fixing device and use method thereof | |
| CN205166259U (en) | Jumbo size thin wall section of thick bamboo spelling anchor clamps | |
| CN111613953A (en) | Magnetic pulse quick connection device and connection method for power cable | |
| CN205166304U (en) | Jumbo size thin wall section of thick bamboo spelling frock | |
| CN102437778B (en) | Magnetostrictive linear driver with linear output | |
| CN109946179A (en) | A kind of electromagnetism force loading device and its method suitable for metal tube one directional tensile test | |
| CN207782616U (en) | A kind of servo motor assembled piece type stator iron core coiling clamping device | |
| CN214702676U (en) | Variable magnetic circuit vibration test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |