CN109604934A - A kind of method for laser welding of hot-rolled stainless steel - Google Patents
A kind of method for laser welding of hot-rolled stainless steel Download PDFInfo
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- CN109604934A CN109604934A CN201811603378.5A CN201811603378A CN109604934A CN 109604934 A CN109604934 A CN 109604934A CN 201811603378 A CN201811603378 A CN 201811603378A CN 109604934 A CN109604934 A CN 109604934A
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Abstract
The present invention relates to a kind of method for laser welding of hot-rolled stainless steel, comprising: clamps two pieces of strips to be welded；The welding ends of two strips to be welded is sheared respectively；Two strips to be welded after shearing are subjected to piece；Two strips to be welded are subjected to using hybrid Laser-Arc Welding technique；Welded seam area is made annealing treatment.Hybrid Laser-Arc Welding technique is applied in the welding production of hot-rolled stainless steel by the present invention, suitably increase pool depth while guaranteeing big fusion penetration, reduce setting rate, it can make the coarse clean diffusion and refinement of weld dimensions, the defects of to improve the extensibility and toughness of weld seam, avoid weld seam that low-temperature cracks occur；In addition, may be implemented to obtain bigger fusion penetration and speed of welding under lower laser power using hybrid Laser-Arc Welding technique, is conducive to improve welding efficiency, reduces cost.
Description
Technical field
The invention belongs to strip welding technology fields, and in particular to a kind of method for laser welding of hot-rolled stainless steel, especially
Be for 400 be hot-rolled stainless steel method for laser welding.
Background technique
Stainless steel sour rolling mill welds strip steel head and tail portion using laser welder, to guarantee the company of production line
Continuous property.Sour rolling mill raw material is derived from hot-rolled stainless steel material, wherein being that hot-rolled stainless steel is difficult to weld with 400.
400 be that stainless steel is divided into martensite type and ferrite type.When martensitic stain less steel is welded, there are brittleness, low
Warm toughness deteriorates, and the ductility decline generated with hardening, the tissue of welding heat affected zone are usually not only hard but also crisp.Ferrite is not
Rust steel has good welding performance in the case where phosphorus content is low, and sensibility is relatively low in weld crack；But due to being heated to
900 DEG C or more of heat affected area crystal grain is significantly thicker, so that lack extensibility and toughness at room temperature, Yi Fasheng low-temperature cracks.
Laser welder is welded frequently with following steps: clamping strip → shearing → piece → pre- induction heating → laser
Welding → annealing.It is the weld seam of stainless steel using welding procedure welding 400, even if configuration of surface is full, is examined in weldquality
It surveys in cupping experimental machine and can not also pass through when cupping experiment；This weld seam is easy to happen weld seam when rolling on tandem mill
Thermoinduction area fracture, so as to cause disconnected band.
Summary of the invention
The present embodiments relate to a kind of method for laser welding of hot-rolled stainless steel, can at least solve the part of the prior art
Defect.
The present embodiments relate to a kind of method for laser welding of hot-rolled stainless steel, include the following steps:
Step 1 clamps two pieces of strips to be welded；
Step 2 shears the welding ends of two strips to be welded respectively；
Two strips to be welded after shearing are carried out piece by step 3；
Step 4 is subjected to two strips to be welded using hybrid Laser-Arc Welding technique；
Step 5 makes annealing treatment welded seam area.
As one of embodiment, the annealing includes online annealing, while hybrid Laser-Arc Welding
It anneals to molded weld seam.
As one of embodiment, hybrid Laser-Arc Welding operation is carried out by hybrid Laser-Arc Welding head, along weld seam
Extending direction carries out online annealing operation in hybrid Laser-Arc Welding head rear setting load coil.
As one of embodiment, the annealing further includes making annealing treatment offline, and offline annealing is being moved back online
It is carried out after fire processing.
As one of embodiment, offline anneal the distance between station and welding post are 3~5m.
As one of embodiment, strip is run from welding post to offline annealing station, passes through control strip fortune
Scanning frequency degree is to adjust the cooling degree of weld seam, and temperature is down to 450~600 DEG C when weld seam being made to reach offline annealing station.
As one of embodiment, hot-rolled stainless steel is 400 when being ferritic stainless steel, the annealing power made annealing treatment offline
For 40KW~60KW, annealing speed is 3~4m/min.
As one of embodiment, hot-rolled stainless steel is 400 when being martensitic stain less steel, the annealing power made annealing treatment offline
For 20KW~45KW, annealing speed is 1~2m/min.
As one of embodiment, online annealing, which is handled, is all made of load coil with offline annealing, and two inductions add
Heat coil shares an intermediate frequency induction heating power supply and water cooling unit.
As one of embodiment, the annealing power of online annealing processing is 20KW~40KW, annealing speed and speed of welding
It is identical.
The embodiment of the present invention at least has the following beneficial effects:
Hybrid Laser-Arc Welding technique is applied in the welding production of hot-rolled stainless steel by the present invention, is guided using electric arc
Hybrid Laser-Arc Welding technique welded, electric arc first acts on strip, using the pre- heat effect of electric arc, guarantee it is big molten
Suitably increase pool depth while deep, reduce setting rate, the coarse clean diffusion and refinement of weld dimensions can be made,
The defects of to improve the extensibility and toughness of weld seam, avoid weld seam that low-temperature cracks occur；In addition, using laser-arc hybrid welding process
Technique is connect, may be implemented to obtain bigger fusion penetration and speed of welding under lower laser power, is conducive to improve welding efficiency, drop
Low cost.
The embodiment of the present invention further has the following beneficial effects:
The present invention welds hot-rolled stainless steel using hybrid Laser-Arc Welding+online annealing processing group technology
Processing, can effectively improve the quality of weld seam, especially extensibility and toughness, guarantee the product quality of hot-rolled stainless steel.
The embodiment of the present invention further has the following beneficial effects:
Hot-rolled stainless steel method for laser welding provided by the invention, using the processing of hybrid Laser-Arc Welding+online annealing+
The group technology made annealing treatment offline can improve the quality of weld seam, the extensibility of the weld dimensions of product significantly
Good, not easily broken band guarantees the product quality of hot-rolled stainless steel.This method simple process, easy to operate, production cost is low.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow diagram of the method for laser welding of hot-rolled stainless steel provided in an embodiment of the present invention.
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.
Such as Fig. 1, the embodiment of the present invention provides a kind of method for laser welding of hot-rolled stainless steel, includes the following steps:
Step 1 clamps two pieces of strips to be welded；
Step 2 shears the welding ends of two strips to be welded respectively；
Two strips to be welded after shearing are carried out piece by step 3；
Step 4 is subjected to two strips to be welded using hybrid Laser-Arc Welding technique；
Step 5 makes annealing treatment welded seam area.
Hybrid Laser-Arc Welding technique is the prior art in technical field of laser welding, is not described further herein.This reality
It applies in example, hybrid Laser-Arc Welding technique is applied in the welding production of hot-rolled stainless steel, the laser guided using electric arc
Electric arc hybrid welding technology is welded, and electric arc first acts on strip, using the pre- heat effect of electric arc, is guaranteeing the same of big fusion penetration
When suitably increase pool depth, reduce setting rate, the coarse clean diffusion and refinement of weld dimensions can be made, to mention
The extensibility and toughness of high weld seam, avoid weld seam occur low-temperature cracks the defects of；In addition, using hybrid Laser-Arc Welding work
Skill may be implemented to obtain bigger fusion penetration and speed of welding under lower laser power, be conducive to improve welding efficiency, reduce at
This.
" welding ends of two strips to be welded is distinguished in " clamp two pieces of strips to be welded " in above-mentioned steps one, step 2
Sheared " and step 3 in " two strips to be welded after shearing are subjected to pieces " all with existing hot-rolled stainless steel laser
The relevant operation process of welding is no different, and is not repeated herein.
Above-mentioned method for laser welding is advanced optimized, for above-mentioned annealing treating process, in the present embodiment, is preferably adopted
With online annealing, i.e., the described annealing includes online annealing, to molded weldering while hybrid Laser-Arc Welding
Seam is annealed.By online annealing, it can further make the coarse clean diffusion and refinement of weld dimensions, improve weldering
The extensibility and toughness of seam, avoid weld dimensions occur low-temperature cracks the defects of.
Therefore, the present embodiment is using hybrid Laser-Arc Welding+online annealing processing group technology to hot-rolled stainless steel
Soldering is carried out, the quality of weld seam, especially extensibility and toughness can be effectively improved, guarantee the product of hot-rolled stainless steel
Quality.
Specifically, can be realized by such as flowering structure: above-mentioned hybrid Laser-Arc Welding for the processing of above-mentioned online annealing
It is subjected to by hybrid Laser-Arc Welding head, along weld seam extending direction at hybrid Laser-Arc Welding head rear
Load coil is set and carries out online annealing operation.It is to be appreciated that hybrid Laser-Arc Welding head rear is laser electricity
The side close to molded weld seam of arc composite welding head.
Further, the annealing speed of online annealing processing is identical as speed of welding, and the two synergistic effect guarantees weld seam matter
Amount.In addition, the annealing power of online annealing can be designed according to steel strip thickness, in the present embodiment, online annealing power is
20KW~40KW, be applicable to the 400 of various steel strip thicknesss be stainless steel production needs, obtain good weldquality.
Above-mentioned method for laser welding is advanced optimized, the annealing further includes making annealing treatment offline, and anneal offline
Processing carries out after online annealing processing, i.e., after welding finishes, strip is run to offline annealing station, to weld seam carry out from
Line annealing.
It is heated again by making annealing treatment offline to being cooled to a degree of weld seam after online annealing, may make weldering
Seam is detached from its brittle zone, to improve the plasticity of weld seam.
Hot-rolled stainless steel method for laser welding provided in this embodiment, at hybrid Laser-Arc Welding+online annealing
The group technology manage+made annealing treatment offline can improve the quality of weld seam, the extension of the weld dimensions of product significantly
Good, the not easily broken band of property, guarantees the product quality of hot-rolled stainless steel.This method simple process, easy to operate, production cost is low.
It is further preferred that offline annealing the distance between station and welding post (namely online annealing station) for 3~
5m, preferably control guarantee the annealing effect for online annealing+anneal offline in 3m or so.Wherein, strip is from welding post
During operation to offline annealing station, the cooling degree of weld seam is adjusted by control strip speed, reaches weld seam
Temperature is down to 450~600 DEG C when offline annealing station, is further preferably reduced to 500 DEG C or so, to being reduced to the temperature model
The weld seam enclosed is heated again, and the effect annealed offline is preferable, the weldquality of acquisition include its plasticity, toughness etc. all compared with
It is good.
It is made annealing treatment offline as specific preferred embodiment when hot-rolled stainless steel is ferritic stainless steel for 400
Annealing power be 40KW~60KW (being selected according to steel strip thickness), annealing speed be 3~4m/min, preferably 3m/min,
400 obtained are that the weldquality of ferritic stainless steel is preferable.
It is made annealing treatment offline as specific preferred embodiment when hot-rolled stainless steel is martensitic stain less steel for 400
Annealing power is 20KW~45KW (being selected according to steel strip thickness), and annealing speed is 1~2m/min, preferably 1.5m/
Min, the 400 of acquisition are that the weldquality of martensitic stain less steel is preferable.
It is further preferred that online annealing processing is all made of load coil, two induction heatings with offline annealing
Coil shares an intermediate frequency induction heating power supply and water cooling unit by flexible cable, can reduce production cost.Further, two induction
Heating coil switching works, and the output of two channels has self-locking function；For example, when the output heating of online load coil
When, offline load coil does not start.
For above-mentioned load coil formula annealing device, which is mounted on strip lower surface, by small
Vehicle driving, moves with trolley along bead direction, specific structure is omitted herein.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method for laser welding of hot-rolled stainless steel, which comprises the steps of:
Step 1 clamps two pieces of strips to be welded；
Step 2 shears the welding ends of two strips to be welded respectively；
Two strips to be welded after shearing are carried out piece by step 3；
Step 4 is subjected to two strips to be welded using hybrid Laser-Arc Welding technique；
Step 5 makes annealing treatment welded seam area.
2. the method for laser welding of hot-rolled stainless steel as described in claim 1, it is characterised in that: the annealing is included in
Line annealing, anneals to molded weld seam while hybrid Laser-Arc Welding.
3. the method for laser welding of hot-rolled stainless steel as claimed in claim 2, it is characterised in that: pass through laser-arc hybrid welding process
Connector carries out hybrid Laser-Arc Welding operation, is arranged along weld seam extending direction at hybrid Laser-Arc Welding head rear and feels
Heating coil is answered to carry out online annealing operation.
4. the method for laser welding of hot-rolled stainless steel as claimed in claim 2, it is characterised in that: the annealing further includes
Offline annealing, and offline annealing carries out after online annealing processing.
5. the method for laser welding of hot-rolled stainless steel as claimed in claim 4, it is characterised in that: offline annealing station and welding
The distance between station is 3~5m.
6. the method for laser welding of hot-rolled stainless steel as claimed in claim 5, it is characterised in that: strip is run from welding post
To offline annealing station, the cooling degree of weld seam is adjusted by control strip speed, reaches weld seam offline
Temperature is down to 450~600 DEG C when annealing station.
7. the method for laser welding of hot-rolled stainless steel as claimed in claim 4, it is characterised in that: hot-rolled stainless steel is 400 systems
When ferritic stainless steel, the annealing power made annealing treatment offline is 40KW~60KW, and annealing speed is 3~4m/min.
8. the method for laser welding of hot-rolled stainless steel as claimed in claim 4, it is characterised in that: hot-rolled stainless steel is 400 systems
When martensitic stain less steel, the annealing power made annealing treatment offline is 20KW~45KW, and annealing speed is 1~2m/min.
9. the method for laser welding of hot-rolled stainless steel as claimed in claim 4, it is characterised in that: online annealing processing with it is offline
Annealing is all made of load coil, and two load coils share an intermediate frequency induction heating power supply and water cooling unit.
10. the method for laser welding of hot-rolled stainless steel as claimed in claim 2, it is characterised in that: online annealing processing is moved back
Fiery power is 20KW~40KW, and annealing speed is identical as speed of welding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811603378.5A CN109604934B (en) | 2018-12-26 | 2018-12-26 | Laser welding method for hot-rolled stainless steel |
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| CN201811603378.5A CN109604934B (en) | 2018-12-26 | 2018-12-26 | Laser welding method for hot-rolled stainless steel |
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| CN109604934B CN109604934B (en) | 2021-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112077165A (en) * | 2020-08-31 | 2020-12-15 | 日照宝华新材料有限公司 | Rolling method of 50Mn thin high-carbon cold-rolled steel sheet |
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| EP3153271A1 (en) * | 2015-10-08 | 2017-04-12 | Liburdi Engineering Limited | Method of repairing and manufacturing of turbine engine components and turbine engine component repaired or manufactured using the same |
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| CN112077165A (en) * | 2020-08-31 | 2020-12-15 | 日照宝华新材料有限公司 | Rolling method of 50Mn thin high-carbon cold-rolled steel sheet |
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