CN107378286A - The preparation method for the composite hard layer that roller surface built-up welding remelting is combined - Google Patents
The preparation method for the composite hard layer that roller surface built-up welding remelting is combined Download PDFInfo
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- CN107378286A CN107378286A CN201710486006.8A CN201710486006A CN107378286A CN 107378286 A CN107378286 A CN 107378286A CN 201710486006 A CN201710486006 A CN 201710486006A CN 107378286 A CN107378286 A CN 107378286A
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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Abstract
A kind of preparation method for the composite hard layer being combined the present invention relates to roller surface built-up welding remelting, it is characterised in that：The preparation method is to coordinate resurfacing welding material, overlaying method surfacing roll surface using submerged arc overlay welding or open arc built-up welding mode, and after built-up welding certain thickness, remelting is carried out to bead welding using plasma arc.The present invention is using plasma arc temperature is high, energy is concentrated, stability is good, and surface thermal deformation it is small the advantages that, realize roller surface crystal grain refinement, tissue, composition are uniform, S inside overlay cladding, the amount of inclusions such as P are reduced, it is achieved thereby that the raising of roller surface hardness and mechanical uniformity energy, reduces the probability that surface after high-performance roll works produces light and dark striped.
Description
Technical field
It is compound that built-up welding is combined the present invention relates to a kind of submerged arc or open arc hardfacing alloy and plasma arc remelting welding bead
（Again）The technique for manufacturing roller surface, belongs to welding technology field.
Background technology
Iron and steel metallurgical industry is the basic activity of country, and the heavy industry of country, main zero in its production equipment are standby
Part --- roll, be largely high alternate stress, high thermal stress adverse circumstances under work, such as Continuous Casting Rolls, alignment roller, support
Roller, Wrapping Roll, pinch roll, working roll etc., cause roll is too fast to scrap.Bead weld repair is mainly using suitable technique and properly
Resurfacing welding material the roll of abrasion is returned into original size, research is found, to roller surface carry out built-up welding processing, can be obvious
Extend roll campaign, reduce steel rolling consumption.
The method of Bead weld repair roll mainly has at present：Submerged arc overlay welding, gas shielded arc welding built-up welding, self-shield built-up welding, wait from
Sub- cladding, laser cladding, high-power electron beam weldering, strip surfacing etc..Due to traditional submerged arc overlay welding, gas shielded arc welding built-up welding, from
Protecting built-up welding to have, column crystal is thick, and alloying component segregation is serious, uneven microstructure, occasionally has the defects of slag inclusion, seriously limits
The built-up welding of high-performance roll is compound to remanufacture application.And new welding such as plasma cladding built-up welding, laser cladding built-up welding, electronics
Although the plasma arc that its heat is concentrated, protective atmosphere and controllability are good, packing material is mainly powdered alloy for beam built-up welding,
Weld deposit process is stable, and overlay cladding mother metal dilution ratio is low, and shaping is smooth, smooth, and the high alloy such as base, Ni-based is bored especially suitable for built-up welding
Material.But on the one hand finally made because the powder of mechanical mixture may be layered or skewness due to various particle specific gravity differences
Into the stifled powder phenomenon of uneven and normal appearance for preparing overlay performance, equipment can not normal work；On the other hand production effect be present
Rate is low, and cost of alloy is high, and the built-up welding for also seriously limiting high-performance roll compound remanufactures application.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of roller surface built-up welding remelting phase for above-mentioned prior art
With reference to composite hard layer preparation method, on the one hand utilize traditional submerged arc or open arc surfacing roll, improve built-up welding efficiency；It is another
Aspect, beneficial to crystal grain thinning, reduces alloy and just analysed, remove to carrying out rapid remelting to bead welding using plasma remelting technology
Be mingled with, slag inclusion the defects of, really realize the compound new built-up welding skill for remanufacturing application of the built-up welding of high-performance roll in complete meaning
Art.
Technical scheme is used by the present invention solves the above problems：A kind of roller surface built-up welding remelting is combined compound
The preparation method of hardstanding, including two parts of arc surfacing and plasma remelting：
First, roll overlaying：
Overlaying method includes SMAW, melting pole gas shielded arc welding（Including consumable electrode non gas shielded welding）, Tungsten Inert
Gas shielded arc welding, filament submerged-arc welding and combinations thereof.Coordinate suitable resurfacing welding material, bead-welding technology carries out surfacing roll.
General step is：
1.1 roll surface built-up welding should be carried out by bead-welding technology guiding book；Repair welding should be carried out by repair welding guiding book.Particularly built-up welding
Electric current, voltage, roller rotational speed, the head speed of travel, amount of lap, leading, electrode extension, heat treatment, resurfacing welding material,
The Proper Match of the parameters such as detection.
Drying, use, the keeping of 1.2 resurfacing welding materials should meet the requirement of the specification of resurfacing welding material manufactory offer.
1.3 roller stocks preferably select heating furnace to be preheated.Roll surface built-up welding preheating temperature and interlayer temperature should be according to procedure qualifications
As a result choose.During preheating, in room temperature in the range of 100 DEG C, programming rate should not be greater than 40 DEG C/h；After 100 DEG C, should not
Higher than 50 DEG C/h, uniformly heating.
In 1.4 weld deposit process, built-up welding environmental requirement relative closure, insulation can use gas heating or insulation stove heat two
Kind mode.Gas heating must be prevented from carbon black caused by combustion gas and pollute.
1.5 weld deposit process must take continual interlayer temperature and the welding quality of carrying out of automatic or manual mode
Monitoring, defect occur should immediately treat, must not the direct built-up welding on defective layer.
When 1.6 built-up welding one-sided thickness are more than 20mm, in order to reduce the harm of stress and hydrogen, prevent crackle from producing, holding group
Knit and the uniformity of mechanical property, corresponding intermediate heat-treatment can be carried out.
2nd, roll remelting
Roll overlaying carries out plasma remelting processing to after certain size：
2.1 roll surface remeltings should be carried out by bead-welding technology guiding book.Particularly welding current, voltage, roller rotational speed, head row
Walk the Proper Match of the parameters such as speed, amount of lap, leading, throughput, tungsten electrode pattern, tungsten electrode extension elongation, detection.And especially
It is the matching between optimization built-up welding layer and plasma remelting.
Before 2.2 remeltings, answer repair welding and cleaning roller surface, surface defect repair welding is finished as far as possible, after clean out surface
Dust.
During 2.3 plasma remelting, to improve remelting efficiency, the surface temperature of roll is improved as far as possible, not less than facing surface
Temperature.
Occur defect during 2.4 plasma remelting and answer timely processing, also can carry out secondary remelting in defect area, must not have
Direct built-up welding on the layer of defect.
Particularly：
To ensure the wear-resisting of roller surface, corrosion-resistant, the performance such as endurance and good meltability, the selection of resurfacing welding material should be joined
According to：
1）Resurfacing welding material hardness selects：The hardness of resurfacing welding material is typically higher 3~8HRC than the hardness of traditional resurfacing welding material.
2）The selection of alloying component：The alloying component of resurfacing welding material is typically higher than the alloying component of traditional resurfacing welding material by 3
~15%.
3) impurity such as S, P：On the premise of resurfacing welding material facing surface does not crack, the impurity content such as S, P can be carried suitably
Height, but be not higher than<0.04%
4）Facing surface crackle：Surface cracks during to prevent hardfacing alloy weld seam remelting, typically requires the carbon of resurfacing welding material
Content is not higher than 0.8%, and normal temperature section elongation is not less than 6%.
Compared with prior art, the advantage of the invention is that：
The present invention combines the advantages of technique for overlaying and plasma remelting technology, and the refinement for realizing bead welding is brilliant
Grain, alloy just analyses, is mingled with, and reduction the defects of slag inclusion, it is compound to breach current single mode built-up welding（Again）Manufacture high-performance is rolled
The limitation of roller, really realize that the built-up welding of high-performance roll in complete meaning is compound and remanufacture.Using present invention process reparation
Roll has been successfully applied in hot strip mill strip pinch roll, Wrapping Roll；The composite manufacturing by hard surfacing of cold rolling support roller, upper machine
The advantages that functional using rear surface oxidation-resistant, and surface is without glutinous slag, and light and dark striped is not notable, and surface is smooth, can
Meet roll working condition requirement, the obvious bead-welding technology more common than market of service life.The present invention can be exploited to other surfaces engineering
Apply in field.
Embodiment
The above embodiments of the present invention are only intended to the embodiment of the explanation present invention, rather than for limiting this hair
Bright protection domain, it is every for person skilled in the art, as long as can without departing from the technical characteristic scope of the present invention
Various change or amendment are done, its essence is identical with that technical scheme of the present invention, belongs to the protection category of the present invention.
The built-up welding of embodiment 1, remelting are compound（Again）The technique for manufacturing Cr5 cold rolling support rollers
A kind of roller diameter is the submerged arc overlay welding and plasma remelting restorative procedure of Φ 1525mm cold rolling Cr5 support rollers, including
Following processing step and parameter are：
1）The wear surface of lathe turning processing roll is first used, removes face crack and hole, and carry out Non-Destructive Testing.It is final true
It is 18mm that size is repaired on order side.
2）Welding procedure is formulated according to procedure qualification guiding book.
3）Roll preheats, 350 DEG C of preheating temperature, is incubated 30 hours.
4）The bead-welding technology parameter used for：
By taking Φ 3.2mm flux-cored wires as an example, for Φ 3.2mm flux-cored wires, it is desirable to：
Welding current：420~480A
Weldingvoltage：29~32V
Speed of welding：400~550mm/min
Welding bead overlaps：Adjacent welding bead overlap joint must be more than 50%, and specific amount of lap should regard welding bead flat smooth situation.
Weld polarity：Using DC reverse connection.
Electrode extension：16~28mm
Welding bead interlayer temperature：260~380℃
5）In the high tough transition zone of roller surface built-up welding, two layers of built-up welding.
6）Roller surface is cleared up, carries out plasma remelting afterwards.
Melting current：160~280A
Weld rotating speed：100~180mm/min,
Working gas：Argon gas is typically selected during built-up welding, throughput is 3~5L/min
Protective gas：Throughput is 8~12L/min
Fusion penetration：3~5mm
Molten wide：8~13mm
Tungsten electrode retraction length：1.5~3.0mm.
Welding bead overlaps：Adjacent welding bead overlap joint about 18%
7）Skull on surface, carries out built-up welding capping layer after cleaning remelting, per built-up welding two layers surface layer, a remelting is carried out, with this
Carry out, until a diameter of Φ 1532mm of Bead weld repair sum.
8）The roller surface of built-up welding remelting is heat-treated, including：
Roll is cooled to room temperature laggard furnace treatment reason, and in room temperature within 100 DEG C, programming rate not should be greater than 40 DEG C/h, afterwards
50 DEG C/h is not should be greater than, and cooling rate not should be greater than 25 DEG C/h.
It is 565 DEG C to be tempered maximum temperature, is incubated 36 hours.When furnace temperature is reduced to 150 DEG C, it can come out of the stove and be placed in dedicated box
Or slow cooling is covered to room temperature with asbestos.
9）Last turning is refined to given size and precision.
10）The detection of roll, including the defects of hardness and crackle.It was found that heap postwelding case hardness is in 51 ± 1.5HRC, table
Face and internal equal zero defect.Visible by hardness, the roll hardness uniformity after Bead weld repair is significantly improved.
The built-up welding of embodiment 2, remelting are compound（Again）The technique for manufacturing hot-strip Wrapping Roll
A kind of roller diameter is the submerged arc overlay welding and plasma remelting restorative procedure of Φ 380mm Wrapping Roll, including following technique
Step：
1）The wear surface of lathe turning processing roll is first used, removes face crack and hole.And carry out Non-Destructive Testing.It is final true
It is 15mm that size is repaired on order side.
2）Welding procedure is formulated according to procedure qualification guiding book.
3）Roll preheats, 350 DEG C of preheating temperature, is incubated 8 hours.
4）The bead-welding technology parameter used for：
By taking Φ 3.2mm flux-cored wires as an example, for Φ 3.2mm flux-cored wires, it is desirable to：
Welding current：360~480A
Weldingvoltage：27~32V
Speed of welding：380~500mm/min
Welding bead overlaps：Adjacent welding bead overlap joint must be more than 50%, and specific amount of lap should regard welding bead flat smooth situation.
Weld polarity：Using DC reverse connection.
Electrode extension：16~28mm
Welding bead interlayer temperature：260~380℃
5）In the high tough transition zone of roller surface built-up welding, one layer of built-up welding.
6）Roller surface is cleared up, carries out plasma remelting afterwards.The parameter of plasma remelting is：
Melting current：160~260A
Weld rotating speed：100~180mm/min,
Working gas：Argon gas is typically selected during built-up welding, throughput is 3~5L/min
Protective gas：Throughput is 8~12L/min
Fusion penetration：3~5mm
Molten wide：8~13mm
Tungsten electrode retraction length：1.5~3.0mm.
Welding bead overlaps：Adjacent welding bead overlap joint about 20%
7）Skull on surface, carries out built-up welding capping layer after cleaning remelting, per one layer of capping layer of built-up welding, a remelting is carried out, with this
Carry out, until a diameter of Φ 386mm. of Bead weld repair sum
8）The roller surface of built-up welding remelting is heat-treated, including：
Roll is cooled to room temperature laggard furnace treatment reason, and in room temperature within 100 DEG C, programming rate not should be greater than 40 DEG C/h, afterwards
50 DEG C/h is not should be greater than, and cooling rate not should be greater than 25 DEG C/h.
It is 550 DEG C to be tempered maximum temperature, is incubated 12 hours.When furnace temperature is reduced to 150 DEG C, it can come out of the stove and be placed in dedicated box
Or slow cooling is covered to room temperature with asbestos.
9）Last turning is refined to given size and precision.
10）The detection of roll, including the defects of hardness and crackle.It was found that heap postwelding case hardness is in 57 ± 1.5HRC, table
Face and internal equal zero defect.Visible by hardness, the roll hardness uniformity after Bead weld repair is significantly improved.
The built-up welding of embodiment 3, remelting are compound（Again）The technique for manufacturing Continuous Casting Rolls
A kind of roller diameter is the open arc oscillating build-up welding and plasma remelting restorative procedure of Φ 180mm Continuous Casting Rolls, including following
Processing step：
1）The wear surface of lathe turning processing roll is first used, removes face crack and hole.And carry out Non-Destructive Testing.It is final true
It is 5mm that size is repaired on order side.
2）Welding procedure is formulated according to procedure qualification guiding book.
3）Roll preheats, 150 DEG C of preheating temperature, is incubated 2 hours.
4）In one layer of Cr17 of roller surface built-up welding transition zone, the bead-welding technology parameter used for：
By taking Φ 2.4mm flux-cored wires as an example, for Φ 2.4mm flux-cored wires, it is desirable to：：
Arc voltage：26.0~28.5V,
Welding current：270~300A
Wire feed rate：125~130in/min
Transverse moving speed：0.22~0.25ipm
Welding wire extends：22~28mm
Tip angle of inclination：3~5 degree backward
Swing width (final size) is about 48mm, beats 8~12mm of the amount of connecing
Delay：Press the local multiple-time delay in road about 0.5 second, the place in Bu Ya roads is delayed about 0.3 second less.
Electrode extension：20~35mm
5）Built-up welding capping layer, two layers of built-up welding, parameter is consistent with bottoming.
6）Carry out a remelting.The parameter of plasma remelting is：
Melting current：160~260A
Weld rotating speed：90~150mm/min,
Working gas：Argon gas is typically selected during built-up welding, throughput is 3~5L/min
Protective gas：Throughput is 8~12L/min
Fusion penetration：4~5mm
Molten wide：8~13mm
Tungsten electrode retraction length：1.5~3.0mm.
Welding bead overlaps：Adjacent welding bead overlap joint about 20%
7）The roller surface of built-up welding remelting carries out slow cooling insulation, has ready conditions thermally processable.
8）Last turning is refined to given size and precision.
9）The detection of roll, including the defects of hardness and crackle.It was found that heap postwelding case hardness is on 44 ± 1.5HRC, surface
And internal equal zero defect.Visible by hardness, the roll hardness uniformity after Bead weld repair is significantly improved.
Claims (6)
- A kind of 1. preparation method for the composite hard layer that roller surface built-up welding remelting is combined, it is characterised in that：The preparation side Method is to coordinate resurfacing welding material, overlaying method surfacing roll surface, built-up welding certain thickness using submerged arc overlay welding or open arc built-up welding mode Afterwards, remelting is carried out to bead welding using plasma arc.
- 2. the preparation method for the composite hard layer that a kind of roller surface built-up welding remelting according to claim 1 is combined, its It is characterised by：1）The hardness of resurfacing welding material is higher 3~8HRC than the hardness of traditional resurfacing welding material before remelting；2）The alloying component of resurfacing welding material is higher than the alloying component of traditional resurfacing welding material by 3~15% before remelting；3）Impurity content can properly increase, but be not higher than<0.04%；4）The carbon content of resurfacing welding material is not higher than 0.8%, and normal temperature section elongation is not less than 6%.
- 3. the preparation method for the composite hard layer that a kind of roller surface built-up welding remelting according to claim 1 is combined, its It is characterised by：Overlaying method includes SMAW, melting pole gas shielded arc welding, gas tungsten arc welding, filament Submerged-arc welding and combinations thereof.
- 4. the preparation method for the composite hard layer that a kind of roller surface built-up welding remelting according to claim 1 is combined, its It is characterised by：Roll overlaying certain thickness refers to reach optimum performance or cost performance, optimization overlay cladding and plasma remelting layer it Between matching.
- 5. the preparation method for the composite hard layer that a kind of roller surface built-up welding remelting according to claim 1 is combined, its It is characterised by：Roll surface built-up welding preheating temperature and interlayer temperature should be chosen according to procedure qualification result, during preheating, in room temperature to 100 In the range of DEG C, programming rate should not be greater than 40 DEG C/h；After 100 DEG C, 50 DEG C/h is should not be greater than, uniformly heating；Interlayer temperature Spend because being higher than interlayer temperature when individually using built-up welding.
- 6. the preparation method for the composite hard layer that a kind of roller surface built-up welding remelting according to claim 1 is combined, its It is characterised by：The roller surface of built-up welding remelting is heat-treated, including：Roll is cooled to the laggard furnace treatment reason of room temperature, in room temperature To within 100 DEG C, programming rate not should be greater than 40 DEG C/h, not should be greater than 50 DEG C/h afterwards, and cooling rate not should be greater than 25 DEG C/h； Soaking time is not less than roller diameter divided by 50.5, unit hour；When furnace temperature is reduced to 150 DEG C, it can come out of the stove and be placed in dedicated box It is interior or cover slow cooling to room temperature with asbestos.
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| CN201710486006.8A CN107378286A (en) | 2017-06-23 | 2017-06-23 | The preparation method for the composite hard layer that roller surface built-up welding remelting is combined |
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| CN201710486006.8A CN107378286A (en) | 2017-06-23 | 2017-06-23 | The preparation method for the composite hard layer that roller surface built-up welding remelting is combined |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110293131A (en) * | 2019-06-27 | 2019-10-01 | 西峡龙成特种材料有限公司 | A kind of heat resistant and wear resistant roller and its production technology |
| CN114669840A (en) * | 2022-05-09 | 2022-06-28 | 苏州威奥得焊材科技有限公司 | Method for repairing nodular cast iron roller |
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