CN109317787A - A kind of steel conduit all positon narrow gap TIG automatic welding process - Google Patents
A kind of steel conduit all positon narrow gap TIG automatic welding process Download PDFInfo
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- CN109317787A CN109317787A CN201811354522.6A CN201811354522A CN109317787A CN 109317787 A CN109317787 A CN 109317787A CN 201811354522 A CN201811354522 A CN 201811354522A CN 109317787 A CN109317787 A CN 109317787A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/222—Non-consumable electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a kind of steel conduit all positon narrow gap TIG automatic welding process, include the following steps: the selection of step S1, welding material；Step S2, the determination of welding position；Step S3,2G and 5G pipeline is both designed as U-shaped groove；Step S4, technological parameter determines；Step S5, heat treatment process is set, and welding pre-heating temperature is 150 DEG C -250 DEG C, and interlayer temperature is maintained at 150 DEG C -250 DEG C；After the completion of weld seam integral solder, welding point progressively cools to 100 DEG C, and keeps the temperature two hours, it is ensured that entire joint area temperature has dropped down to Ms or less；Bulk heat treatmet method is taken to postwelding steel pipe, carries out high tempering.The present invention is using narrow gap TIG automatic welding welded pipe line as welding object, and by two kinds of welding procedure welding points of single track multilayer and multiple tracks multilayer, acquisition completely reliably seeks new technological parameter, so that the steel pipe after welding obtains more excellent comprehensive performance.
Description
Technical field
The invention belongs to TIG automatic welding technique field more particularly to a kind of steel conduit all positon narrow gap TIG automatic weldings
Technique.
Background technique
A kind of welding technique of the narrow gap automatic welding technique as maturation, welding stability with higher and excellent weldering
Quality is connect, is widely used in the welding of power plant's main pipeline.With the extensive use of the tubing and plate of big thickness, traditional craft
Welding groove is too wide to be difficult to process, and welding quality and welding efficiency are low, and thermoelectricity scene still mostly uses the side of human weld
The stability of formula, this welding manner is general, can be because of excessive defect caused by human factor, hence it is evident that restrict large welded structures
Development.Main steam header road welding quality requirement in thermoelectricity is very high, and narrow gap automatic welding technique has efficient advantage, first
Groove cross-sectional area can first be greatly lowered, reduce heat input, need less metal loading, secondly weld metal and heat
The tissue of the zone of influence obviously refines, and residual stress and residual deformation are small, stress corrosion resistant sensitive capability and fatigue crack-resistant
Ability is high, and mechanical property includes that plasticity and toughness such as significantly improve at the unique advantages.The increasingly automated spy of narrow gap automatic welding simultaneously
Point reduces the welding technique requirement to operator, therefore thermoelectricity main pipeline is welded, especially the material under hot operation
Expect that this technology has very big development prospect.
Summary of the invention
It is an object of the invention to overcome problem above of the existing technology, steel conduit all positon narrow gap TIG is provided
Automatic welding process.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of steel conduit all positon narrow gap TIG automatic welding process, includes the following steps:
Step S1, the selection of welding material
Step S2, the determination of welding position
Welding position 2G and 5G are often used using thermal power plant；
Step S3, groove designs
2G and 5G pipeline is both designed as U-shaped groove；
Step S4, technological parameter determines
A, the position 2G welding procedure:
Tungsten electrode rocking action includes three movements in the welding process of the position 2G:
Tungsten electrode movement 1: bottom welding and cover welding are used for；
Tungsten electrode movement 2: the upside welding bead being used to support in welding bead, filler pass and levelling welding bead；
Tungsten electrode movement 3: the downside welding bead being used to support in welding bead, filler pass and levelling welding bead；
Remelting is carried out using the movement of corresponding tungsten electrode respectively when the bad curve with incomplete fusion occurs sprawling in upper and lower sides welding bead
Adjustment；
B, the position 5G welding procedure:
It includes four movements that tungsten electrode, which waves dynamic, in the welding process of the position 5G:
Tungsten electrode movement 21: bottom welding and cover welding are used for；
Tungsten electrode movement 22: the upside welding bead and adjustment being used to support in welding bead, filler pass and levelling welding bead are sprawled not
Good welding bead；
Tungsten electrode movement 23: the downside welding bead and adjustment being used to support in welding bead, filler pass and levelling welding bead are sprawled not
Good welding bead；
Tungsten electrode movement 24: for adjusting the side wall incomplete fusion of welding bead；
Step S5, heat treatment process is set
Welding pre-heating temperature is 150 DEG C -250 DEG C, and interlayer temperature is maintained at 150 DEG C -250 DEG C；This is kept in welding process
One preheating temperature and all subsequent minimum interlayer temperatures, preheating temperature and interlayer temperature are before each welding bead is by striking welding
It is checked；
After the completion of weld seam integral solder, welding point progressively cools to 100 DEG C, and keeps the temperature two hours, it is ensured that entirely connects
Head region temperature has dropped down to Ms or less；
Then heat treatment work removes heat preservation, heating tape, and reinstalls thermocouple, heating tape, insulating layer, is at postwelding heat
Reason is ready；
Bulk heat treatmet method taken to postwelding steel pipe, carries out high tempering, heating temperature range 750 DEG C -770 DEG C it
Between.
Further, packing material is selected as ER90S-G welding wire in step S1, and specification is Φ 1.2mm.
Further, the welding position 2G is vertical fixed position, horizontal position welding；Welding position 5G is horizontal fixed position,
The fixed weldering of pipe level.
Further, U-shaped groove face described in step S3 requires smooth, must not have crackle layering be mingled with groove it is broken
Undermine veining defect；Answer the cleaning of the sundries such as Jiang Shui, oil, paint, dirt and oxide skin dry within the scope of groove and its outer wall two sides 15-20mm
Only, until exposing metallic luster；Encountering tube wall mismatch value is more than 1mm, should be by DL/T 869-2012 predetermined processing, to protect
Tube wall is held to flush.
Further, according to DL/T869 " thermal power plant welding technique regulation " and DL/T819, " firepower is sent out in step S5
Power plant weld heat treatment technics regulation " regulation, bulk heat treatmet method is taken to postwelding steel pipe.
Beneficial effects of the present invention:
The present invention passes through single track multilayer (position 5G) and multiple tracks using narrow gap TIG automatic welding welded pipe line as welding object
Two kinds of welding procedure welding points of multilayer (position 2G), acquisition completely reliably seek new technological parameter, so that the steel after welding
Pipe obtains more excellent comprehensive performance；
The present invention has carried out weld preheating and post weld heat treatment process during welded still pipe, to steel pipe, pre- before welding
Heat be it is cracked in welding process in order to prevent, constant temperature two hours before post weld heat treatment are to carry out dehydrogenation, hydrogen
The control of content can effectively reduce the tendency that connector generates cold crack, and post weld heat treatment is in order to brittle martensite group
Carry out tempering is knitted, while reducing welding residual stress.
Detailed description of the invention
The present invention will be further described below with reference to the drawings.
Fig. 1 is the structural schematic diagram of the U-shaped groove of 2G pipeline；
Fig. 2 is the structural schematic diagram of the U-shaped groove of 2G pipeline；
Fig. 3 is tungsten electrode rocking action schematic diagram in the welding process of the position 2G；
Fig. 4 is tungsten electrode rocking action schematic diagram in the welding process of the position 5G；
Fig. 5 is post weld heat treatment process curve figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " aperture ", "upper", "lower", " thickness ", "top", " in ",
Indicating positions or the positional relationship such as " length ", "inner", " surrounding ", are merely for convenience of description of the present invention and simplification of the description, without
It is that the component of indication or suggestion meaning or element must have a particular orientation, is constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.
A kind of steel conduit all positon narrow gap TIG automatic welding process, includes the following steps:
Step S1, the selection of welding material
The present embodiment selection is P92 steel pipe two, and specification is φ 440mm × 72mm, length 500mm；Packing material is
ER90S-G welding wire, specification are Φ 1.2mm；
Step S2, the determination of welding position
Welding position 2G (vertically fixing position, i.e. horizontal position welding) and 5G (the fixed position of level, i.e. pipeline are often used using thermal power plant
The fixed weldering of level)；
Step S3, groove designs
2G and 5G pipeline is both designed as U-shaped groove, and welding bead arrangement is as illustrated in fig. 1 and 2 respectively；
U-shaped groove face require it is smooth, must not have crackle layering be mingled with the defects of groove is damaged and burr；Groove and
The sundries such as Jiang Shui, oil, paint, dirt and oxide skin are answered to clean out within the scope of the 15-20mm of its outer wall two sides, until exposing metal light
Pool；To keep tube wall to flush, encountering tube wall mismatch value is more than 1mm, should be by DL/T 869-2012 predetermined processing；
Step S4, technological parameter determines
(1) position 2G welding condition is as shown in table 1:
The position table 12G welding condition
As shown in figure 3, tungsten electrode rocking action includes three movements in the welding process of the position 2G:
Tungsten electrode movement 1: bottom welding and cover welding are used for；
Tungsten electrode movement 2: the upside welding bead being used to support in welding bead, filler pass and levelling welding bead；
Tungsten electrode movement 3: the downside welding bead being used to support in welding bead, filler pass and levelling welding bead；
Remelting is carried out using the movement of corresponding tungsten electrode respectively when the bad curve with incomplete fusion occurs sprawling in upper and lower sides welding bead
Adjustment；
(2) position 5G welding condition is as shown in table 2:
The position table 25G welding condition
As shown in figure 4, it includes four movements that tungsten electrode, which waves dynamic, in the welding process of the position 5G:
Tungsten electrode movement 21: bottom welding and cover welding are used for；
Tungsten electrode movement 22: the upside welding bead and adjustment being used to support in welding bead, filler pass and levelling welding bead are sprawled not
Good welding bead；
Tungsten electrode movement 23: the downside welding bead and adjustment being used to support in welding bead, filler pass and levelling welding bead are sprawled not
Good welding bead；
Tungsten electrode movement 24: for adjusting the side wall incomplete fusion of welding bead；
Step S5, heat treatment process is set
Welding pre-heating temperature is 150 DEG C -250 DEG C, and interlayer temperature is maintained at 150 DEG C -250 DEG C；It must be protected in welding process
This preheating temperature and all subsequent minimum interlayer temperatures are held, preheating temperature and interlayer temperature must will draw in each welding bead
It is checked before arc welding；
After the completion of weld seam integral solder, welding point progressively cools to 100 DEG C, and keeps the temperature two hours, it is ensured that entirely connects
Head region temperature has dropped down to Ms, and (Ms is the initial temperature of martensite transfor mation, is the difference of austenite and martensite two-phase free energy
Temperature needed for reaching phase transformation when simulation power) below；Then heat treatment work removes heat preservation, heating tape, and reinstalls
Thermocouple, heating tape, insulating layer, are ready for post weld heat treatment；
" heat treatment technics is welded in thermal power plant according to DL/T869 " thermal power plant welding technique regulation " and DL/T819
Regulation " regulation, bulk heat treatmet method taken to postwelding P92 steel pipe, carries out high tempering, heating temperature range 750 DEG C-
Between 770 DEG C, specific heat treatment cycle curve as shown in Figure 5 (remove at 100 DEG C and protect by wherein, 300 DEG C or less natural coolings
Temperature)；
Weld preheating be it is cracked in welding process in order to prevent, be within constant temperature two hours before post weld heat treatment in order into
Row dehydrogenation, the control of hydrogen content can effectively reduce the tendency that connector generates cold crack, and post weld heat treatment is in order to right
Brittle martensitic structure carries out tempering, while reducing welding residual stress.
Above content is only to structure of the invention example and explanation, affiliated those skilled in the art couple
Described specific embodiment does various modifications or additions or is substituted in a similar manner, without departing from invention
Structure or beyond the scope defined by this claim, is within the scope of protection of the invention.
Claims (5)
1. a kind of steel conduit all positon narrow gap T I G automatic welding process, which comprises the steps of:
Step S1, the selection of welding material
Step S2, the determination of welding position
Welding position 2G and 5G are often used using thermal power plant；
Step S3, groove designs
2G and 5G pipeline is both designed as U-shaped groove；
Step S4, technological parameter determines
A, the position 2G welding procedure:
Tungsten electrode rocking action includes three movements in the welding process of the position 2G:
Tungsten electrode movement 1: bottom welding and cover welding are used for；
Tungsten electrode movement 2: the upside welding bead being used to support in welding bead, filler pass and levelling welding bead；
Tungsten electrode movement 3: the downside welding bead being used to support in welding bead, filler pass and levelling welding bead；
Remelting adjustment is carried out using the movement of corresponding tungsten electrode respectively when the bad curve with incomplete fusion occurs sprawling in upper and lower sides welding bead；
B, the position 5G welding procedure:
It includes four movements that tungsten electrode, which waves dynamic, in the welding process of the position 5G:
Tungsten electrode movement 21: bottom welding and cover welding are used for；
Tungsten electrode movement 22: the upside welding bead and adjustment being used to support in welding bead, filler pass and levelling welding bead are sprawled undesirable
Welding bead；
Tungsten electrode movement 23: the downside welding bead and adjustment being used to support in welding bead, filler pass and levelling welding bead are sprawled undesirable
Welding bead；
Tungsten electrode movement 24: for adjusting the side wall incomplete fusion of welding bead；
Step S5, heat treatment process is set
Welding pre-heating temperature is 150 DEG C -250 DEG C, and interlayer temperature is maintained at 150 DEG C -250 DEG C；Keep this pre- in welding process
Hot temperature and all subsequent minimum interlayer temperatures, preheating temperature and interlayer temperature are subject to before being by striking welding in each welding bead
Verification；
After the completion of weld seam integral solder, welding point progressively cools to 100 DEG C, and keeps the temperature two hours, it is ensured that entire connector area
Domain temperature has dropped down to Ms or less；
Then heat treatment work removes heat preservation, heating tape, and reinstalls thermocouple, heating tape, insulating layer, does for post weld heat treatment
It is good to prepare；
Bulk heat treatmet method is taken to postwelding steel pipe, carries out high tempering, heating temperature range is between 750 DEG C -770 DEG C.
2. a kind of steel conduit all positon narrow gap T I G automatic welding process according to claim 1, which is characterized in that step
Packing material is selected as ER90S-G welding wire in rapid S1, and specification is Φ 1.2mm.
3. a kind of steel conduit all positon narrow gap T I G automatic welding process according to claim 1, which is characterized in that institute
Stating welding position 2G is vertical fixed position, horizontal position welding；Welding position 5G is horizontal fixed position, the fixed weldering of pipe level.
4. a kind of steel conduit all positon narrow gap T I G automatic welding process according to claim 1, which is characterized in that step
U-shaped groove face described in rapid S3 requires smooth, must not have crackle layering be mingled with groove is damaged and veining defect；Groove and
The sundries such as Jiang Shui, oil, paint, dirt and oxide skin are answered to clean out within the scope of the 15-20mm of its outer wall two sides, until exposing metal light
Pool；Encountering tube wall mismatch value is more than 1mm, should be by DL/T 869-2012 predetermined processing, to keep tube wall to flush.
5. a kind of steel conduit all positon narrow gap T I G automatic welding process according to claim 1, which is characterized in that step
" heat treatment technics rule are welded in thermal power plant according to DL/T869 " thermal power plant welding technique regulation " and DL/T819 in rapid S5
Journey " regulation, bulk heat treatmet method is taken to postwelding steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811354522.6A CN109317787A (en) | 2018-11-14 | 2018-11-14 | A kind of steel conduit all positon narrow gap TIG automatic welding process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811354522.6A CN109317787A (en) | 2018-11-14 | 2018-11-14 | A kind of steel conduit all positon narrow gap TIG automatic welding process |
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| CN109317787A true CN109317787A (en) | 2019-02-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111843262A (en) * | 2020-06-16 | 2020-10-30 | 中煤北京煤矿机械有限责任公司 | High-toughness matching narrow gap welding method for forging alloy steel and quenched and tempered high-strength steel |
| CN112475556A (en) * | 2020-11-11 | 2021-03-12 | 鞍钢股份有限公司 | Composite blank assembly welding method adopting narrow-gap MAG transverse welding method |
| CN115139000A (en) * | 2022-05-27 | 2022-10-04 | 中国能源建设集团天津电力建设有限公司 | Jumping and centering welding method |
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| CN112475556A (en) * | 2020-11-11 | 2021-03-12 | 鞍钢股份有限公司 | Composite blank assembly welding method adopting narrow-gap MAG transverse welding method |
| CN115139000A (en) * | 2022-05-27 | 2022-10-04 | 中国能源建设集团天津电力建设有限公司 | Jumping and centering welding method |
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Application publication date: 20190212 |