CN108838541B - Laser welding method and welding joint of cold-rolled steel plate for automobile - Google Patents
Laser welding method and welding joint of cold-rolled steel plate for automobile Download PDFInfo
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- CN108838541B CN108838541B CN201811075073.1A CN201811075073A CN108838541B CN 108838541 B CN108838541 B CN 108838541B CN 201811075073 A CN201811075073 A CN 201811075073A CN 108838541 B CN108838541 B CN 108838541B
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
- B23K26/703—Cooling arrangements
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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
- 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
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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
- 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
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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
- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/302—Cu as the principal constituent
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0408—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work for planar work
Abstract
A laser welding method of cold-rolled steel plates for automobiles comprises the following specific steps: s1, taking two cold-rolled steel plates, removing oil stains on the surfaces, and preparing a welding fixture for later use; s2, placing the two cold-rolled steel plates subjected to decontamination treatment in the step S1 on a workbench in a splicing mode and fixing the two cold-rolled steel plates by using a welding clamp, wherein a gap exists between the two cold-rolled steel plates; s3, filling manganese-copper alloy welding filler in the gap between the two cold-rolled steel plates in the step S2; s4, selecting a laser and setting laser processing parameters; and S5, irradiating the splicing part of the two cold-rolled steel plates by using the laser in the step S4, melting, solidifying and cooling the splicing part to form a high-quality welding seam, and completing the welding of the two cold-rolled steel plates. The method can fully solve the problems in the prior art, improve the mechanical property of the welding joint and reduce the alloying degree of the welding seam and the production cost.
Description
Technical Field
The invention relates to the technical field of welding of ultrahigh-strength steel, in particular to a laser welding method of an automobile cold-rolled steel plate and a welding joint thereof.
Background
The rapid development of the automobile industry plays an important role in the development of national economy and society. However, due to the influence of the problems of energy shortage, environmental pollution and the like, the reduction of energy consumption is an important measure for the sustainable development of the automobile industry. Under the background, the application of lightweight automobile and ultrahigh strength steel becomes an important development direction.
Hot formed steel sheets, which are typical ultra high strength automotive steels, have extremely high material strength and ductility. The tensile strength of a general high-strength steel plate is about 400-450 MPa, the tensile strength of the hot-formed steel plate before heating reaches 500-800 MPa, and the tensile strength of the hot-formed steel plate after heating is improved to 1300-1600 MPa, which is 3-4 times of that of a common steel material, the hardness of the steel plate is second to that of ceramics, and the steel plate has the toughness of the steel material. The hot-formed steel plate is widely applied to the front bumper framework, the rear bumper framework, the A column, the B column and other heavy points because of high mechanical safety, can effectively reduce the deformation of a cockpit when collision occurs, particularly when the collision occurs on the front side and the side, improves the anti-collision capacity and the overall safety of a vehicle body, and can play a good role in protecting people in the vehicle during collision.
Because the steel plate needs to be heated to 900-950 ℃ and kept warm for 5-10 min in the hot forming process, and then hot stamping is carried out to obtain parts, an Al-Si coating needs to be prepared on the surface of the steel plate in advance in order to avoid surface oxidation in the hot stamping forming process. However, due to the existence of the aluminum plating layer, the Al-Si plating layer is melted into the welding pool during the welding process, which seriously affects the phase change process in the welding pool, so that the high-temperature ferrite remains to room temperature, and the mechanical properties of the welded joint are remarkably deteriorated, specifically, as shown in fig. 2, the scanning electron microscope image of the welded joint obviously contains ferrite, so that whether the tailored welding of the hot-formed steel plates with the Al-Si plating layer is successful depends on the high quality and low quality of the welded joint between the hot-formed steel plates. Therefore, in the actual production process, the Al-Si coating on the surface needs to be removed by laser ablation or mechanical polishing and then welded so as to avoid the adverse effect brought by the Al-Si coating, but the method has various working procedures and greatly reduces the production efficiency.
The prior patent CN201380001259.1 discloses a tailor welded blank and a manufacturing method thereof, and a hot stamped part using the tailor welded blank, in which the manufacturing method provided in the patent realizes full martensite in the laser welded region of the Al — Si plated hot formed steel by filling a welding wire containing a large amount of austenitizing elements. Although the method passes a large amount of austenitizing elements such as manganese and carbon, the filled welding wire still contains other austenitizing elements, so that the formation of high-temperature ferrite cannot be clearly inhibited by which element, thereby inevitably causing excessive alloying of the welding line, increasing the production cost and causing unnecessary resource waste.
In view of the above problems in the prior art, it is urgently needed to provide a new welding method for an automotive cold-rolled steel sheet with an Al-Si coating, which can not only improve the mechanical properties of a welded joint, but also reduce the degree of alloying of a weld joint and the production cost.
Disclosure of Invention
In view of the above, the present invention provides a laser welding method for cold-rolled steel sheets for automobiles, which can not only fully solve the problems in the prior art, but also improve the mechanical properties of the welded joint, and reduce the alloying degree of the weld joint and the production cost.
In order to achieve the purpose, the invention adopts the technical scheme that:
a laser welding method of cold-rolled steel plates for automobiles comprises the following specific steps:
s1, taking two cold-rolled steel plates, removing oil stains on the surfaces, and preparing a welding fixture for later use;
s2, placing the two cold-rolled steel plates subjected to decontamination treatment in the step S1 on a workbench in a splicing mode and fixing the two cold-rolled steel plates by using a welding clamp, wherein a gap exists between the two cold-rolled steel plates;
s3, filling manganese-copper alloy welding filler in the gap between the two cold-rolled steel plates in the step S2;
s4, selecting a laser and setting laser processing parameters;
and S5, irradiating the splicing part of the two cold-rolled steel plates by using the laser in the step S4, melting, solidifying and cooling the splicing part to form a high-quality welding seam, and completing the welding of the two cold-rolled steel plates.
Preferably, the thickness of the cold-rolled steel sheet in the step S1 is 0.8 to 2.0mm, and at least one of the two cold-rolled steel sheets is a hot-formed steel sheet with an Al — Si coating.
Preferably, the gap between the cold-rolled steel plates in the step S2 is equal to or less than the thickness of the manganin alloy welding filler in the step S3.
Preferably, the manganin alloy welding filler in the step S3 is a manganin alloy foil and only contains austenitizing elements manganese and copper.
Preferably, in step S3, the welding filler is a manganese-copper alloy wire containing only austenitizing elements manganese and copper, and the welding filler is fed by a wire feeder during laser welding, wherein the speed of the wire feeder is 1.0-6.0 m-min-1。
Preferably, the manganese element content in the manganese-copper alloy welding filler is 5-15%, and the copper element content is 85-95%.
Preferably, the thickness of the manganese-copper alloy foil or the manganese-copper alloy wire is 0.01-0.10 mm.
Preferably, in step S4, the laser is a fiber laser or a CO laser2One of a laser and a semiconductor laser, the laser processing parameters are set as follows: the laser power is 1000-6000W, the welding speed is 5-10 m/min, the defocusing amount is-3- +5mm, and the diameter of a light spot is 0.20-0.50 mm.
Preferably, in step S5, the laser welding operation is performed in air or an oxidizing atmosphere.
Meanwhile, the welded joint prepared by the laser welding method is provided, and the microstructure of the welded joint is lath martensite.
Compared with the prior art, the laser welding method of the cold-rolled steel plate for the automobile, provided by the invention, has the following advantages:
1. after the manganese-copper alloy foil preset in the welding gap is melted and enters a welding pool, the manganese element expands a gamma phase region, reduces a high-temperature existing temperature range of the phase region, promotes the → gamma phase transition, inhibits the precipitation of high-temperature ferrite, realizes the full martensite of a weld joint structure, and improves the mechanical property of a welding joint.
2. The manganese-copper alloy foil is adopted in the invention, and does not contain other alloy elements, thereby effectively reducing the alloying degree of the welding line and reducing the generation cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart illustrating a laser welding method for a cold-rolled steel sheet for an automobile according to the present invention;
FIG. 2 is a scanning electron micrograph of a welded joint obtained without the welding method provided by the present invention;
FIG. 3 is a scanning electron micrograph of a welded joint obtained using the welding method provided by the present invention.
Detailed Description
The interior of the hot-formed steel plate obtained by heat treatment quenching is of a martensite structure, due to the existence of the aluminum coating, the Al-Si coating enters a welding seam after being melted in the laser welding process, and the Al element and the Fe element form a brittle Al-Fe intermetallic compound, so that the phase change process in a welding molten pool is seriously influenced, high-temperature ferrite is kept to room temperature, the mechanical property of a welding joint is obviously deteriorated, and whether the hot-formed steel plate with the Al-Si coating is successfully welded depends on the high quality and the low quality of the welding joint between the hot-formed steel plates. The quality of the welded joint depends on whether the full martensite of the weld joint structure can be realized, and only the precipitation of high-temperature ferrite in the weld joint structure needs to be inhibited. From the basic principle of material science, only one alloying element is added to inhibit the phenomenon.
Manganese, a typical austenite forming element, expands the gamma phase region and facilitates the → gamma phase transition. Therefore, the above design can be achieved if a metal foil or wire containing manganese is added during welding. Meanwhile, from the perspective of reducing the alloying degree of the welding seam, the invention confirms that the design can be realized by adding the manganese-copper alloy foil through repeated tests, and the corrosion resistance of the welding seam can be improved by copper element, so that the service life of the welding joint is prolonged.
A laser welding method of cold-rolled steel plates for automobiles comprises the following specific steps:
s1, taking two cold-rolled steel plates with the thickness of 0.8-2.0 mm, wherein at least one cold-rolled steel plate is a hot-formed steel plate with an Al-Si coating, removing the Al-Si coating on the surface of the hot-formed steel without removing oil stains on the surface of the steel plate by using acetone, and preparing a welding fixture for later use.
And S2, placing the two cold-rolled steel plates subjected to decontamination treatment in the step S1 on a workbench in a splicing mode, and fixing the two cold-rolled steel plates by using a welding clamp, wherein a gap exists between the two cold-rolled steel plates, and the gap distance is less than or equal to the thickness of the filled manganese-copper alloy welding filler.
S3, filling a manganese-copper alloy welding filler in the gap between the two cold-rolled steel plates in the step S2, wherein the manganese-copper alloy welding filler can be a manganese-copper alloy foil or a manganese-copper alloy wire, the thickness of the manganese-copper alloy welding filler is 0.01-0.10 mm, the manganese-copper alloy welding filler only contains austenitizing elements manganese and copper and does not contain other austenitizing alloy elements, the manganese element content in the manganese-copper alloy is 5% -15%, and the copper element content in the manganese-copper alloy is 95% -85%.
After the manganin alloy foil preset in the welding gap is melted into a welding pool, the manganese element in the manganin alloy foil is not only used for inhibiting the formation of brittle intermetallic compounds, but also is used for inhibiting the formation of high-temperature ferrite, and the ferrite is also a brittle structure, which is a problem to be considered. The manganese element enlarges a gamma phase region, reduces a high-temperature existing temperature range of the phase region, promotes the → gamma phase transformation, inhibits the precipitation of high-temperature ferrite, realizes the full martensite of a weld joint structure and improves the mechanical property of a welding joint.
According to the carbon equivalent formula recommended by the international welding society, the following can be seen:
CE＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15(％)
only manganese and copper are added in the method, the lower carbon equivalent can obviously reduce the cracking tendency and the hardening tendency of the welding line, and the subsequent stamping performance is facilitated.
S4, selecting a laser, setting laser processing parameters, selecting a fiber laser and CO for the laser2One of a laser and a semiconductor laser, the laser processing parameters are set as follows: the laser power is 1000-6000W, the welding speed is 5-10 m/min, the defocusing amount is-3- +5mm, and the diameter of a light spot is 0.20-0.50 mm.
S5, irradiating the splicing part of the two cold-rolled steel plates in the air or oxidizing atmosphere by adopting the laser in the step S4, and if the manganin alloy welding filler adopts manganin alloy wires, needing a wire feeder to feed the manganin alloy wires at a speed of 1.0-6.0 m.min-1And feeding the wires at the speed of the welding line to enable the spliced part to be melted, solidified and cooled to form a high-quality welding line, and completing the welding of the two hot forming steel plates.
Thus, after laser welding of cold-rolled steel sheets using the above method, the microstructure of the inside of the resulting welded joint is lath martensite, as shown in fig. 3.
The technical solution of the present invention will be clearly and completely described by the following detailed description. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a laser welding method of a cold-rolled steel plate for an automobile comprises the following steps:
s1, two cold-rolled steel plates with the thickness of 1.5mm are taken, the base material structure is lath martensite, at least one cold-rolled steel plate is a hot forming steel plate with an Al-Si coating, oil stains on the surface of the hot forming steel plate are removed by acetone, and a welding clamp is prepared for standby.
And S2, placing the two cold-rolled steel plates subjected to decontamination treatment in the step S1 on a workbench in a splicing mode, and fixing the two cold-rolled steel plates by using a welding clamp, wherein a gap exists between the two cold-rolled steel plates, and the gap distance is 0.02 mm.
S3, filling a manganese-copper alloy foil in the gap between the two cold-rolled steel plates in the step S2, wherein the manganese element content in the selected manganese-copper alloy foil is 5%, the copper element content is 95%, and the thickness is 0.02 mm;
s4, performing laser welding on the cold-rolled steel plate by using an IPG-6kW fiber laser, wherein the welding power is 2000W, the welding speed is 5m/min, the defocusing amount is +5mm, and the diameter of a light spot is 0.30 mm;
and S5, irradiating the splicing part of the two cold-rolled steel plates by the laser in the step S4 in air or oxidizing atmosphere, so that the splicing part is melted, solidified and cooled to form a high-quality welding seam, and welding the two cold-rolled steel plates.
After welding, the observed welding seam has excellent macroscopic appearance and no obvious splash, high-temperature ferrite is not separated out from the welding seam tissue, the welding seam tissue is a full-lath martensite tissue, a welded joint is broken in a softer heat affected zone, and the strength of the welded joint reaches 1340 MPa.
Example two:
a laser welding method of a cold-rolled steel plate for an automobile comprises the following steps:
s1, selecting two cold-rolled steel plates with the thickness of 1.5mm, wherein the base material structure is lath martensite, at least one cold-rolled steel plate is a hot-formed steel plate with an Al-Si coating, removing oil stains on the surface of the hot-formed steel plate by using acetone, and preparing a welding clamp for standby.
And S2, placing the two cold-rolled steel plates subjected to decontamination treatment in the step S1 on a workbench in a splicing mode, and fixing the two cold-rolled steel plates by using a welding fixture, wherein a gap exists between the two cold-rolled steel plates, and the gap distance is 0.06 mm.
S3, filling a manganese-copper alloy wire in the gap between the two cold-rolled steel plates in the step S2, wherein the manganese element content in the selected manganese-copper alloy wire is 10%, the copper element content is 90%, and the thickness is 0.06 mm;
s4, carrying out laser welding on the cold-rolled steel plate by using an IPG-6kW fiber laser, wherein the welding power is 2000W, the welding speed is 5m/min, the defocusing amount is +5mm, and the diameter of a light spot is 0.30 mm.
S5, irradiating the joint of the two cold-rolled steel plates in the air or oxidizing atmosphere by the laser in the step S4, and feeding the steel plates by a wire feeder at a speed of 3.0 m-min-1The manganese-copper alloy wires are conveyed to the gap at the speed of the welding line, so that the spliced part is melted, solidified and cooled to form a high-quality welding line, and the welding of the two hot forming steel plates is completed.
After welding, the observed macroscopic appearance of the welding seam is excellent, obvious splashing does not exist, high-temperature ferrite is not separated out from the welding seam tissue, the welding seam tissue is a full-lath martensite tissue, the welded joint is broken in a softer heat affected zone, and the strength of the welded joint reaches 1350 MPa.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A laser welding method of a cold-rolled steel plate for an automobile is characterized in that: the method comprises the following specific steps:
s1, taking two cold-rolled steel plates, removing oil stains on the surfaces, and preparing a welding fixture for later use;
s2, placing the two cold-rolled steel plates subjected to decontamination treatment in the step S1 on a workbench in a splicing mode and fixing the two cold-rolled steel plates by using a welding clamp, wherein a gap exists between the two cold-rolled steel plates;
s3, filling a manganese-copper alloy welding filler in the gap between the two cold-rolled steel plates in the step S2, wherein the manganese-copper alloy welding filler only contains austenitizing elements of manganese and copper, the content of manganese is 5-15%, and the content of copper is 85-95%;
s4, selecting a laser and setting laser processing parameters;
and S5, irradiating the splicing part of the two cold-rolled steel plates by using the laser in the step S4, melting, solidifying and cooling the splicing part to form a high-quality welding seam, and completing the welding of the two cold-rolled steel plates.
2. The laser welding method of a cold rolled steel sheet for an automobile according to claim 1, wherein: and the thickness of the cold-rolled steel plate in the step S1 is 0.8-2.0 mm, and at least one of the two cold-rolled steel plates is a hot-formed steel plate with an Al-Si coating.
3. The laser welding method of a cold rolled steel sheet for an automobile according to claim 1, wherein: the gap between the cold-rolled steel plates in the step S2 is less than or equal to the thickness of the manganin alloy welding filler in the step S3.
4. The laser welding method of a cold rolled steel sheet for an automobile according to claim 1, wherein: and in the step S3, the manganese-copper alloy welding filler is a manganese-copper alloy foil.
5. The laser welding method of a cold rolled steel sheet for an automobile according to claim 1, wherein: and in the step S3, the manganin alloy welding filler is a manganin alloy wire, and a wire feeder is used for feeding the manganese in laser welding, wherein the speed of the wire feeder is 1.0-6.0 m.min < -1 >.
6. The laser welding method of a cold rolled steel sheet for automobiles according to claim 4 or 5, wherein: the thickness of the manganese-copper alloy foil or the manganese-copper alloy wire is 0.01-0.10 mm.
7. The laser welding method of a cold rolled steel sheet for an automobile according to claim 1, wherein: in the step S4, the laser selects a fiber laser and CO2One of laser and semiconductor laser, laser processingThe parameters are set as follows: the laser power is 1000-6000W, the welding speed is 5-10 m/min, the defocusing amount is-3- +5mm, and the diameter of a light spot is 0.20-0.50 mm.
8. The laser welding method of a cold rolled steel sheet for an automobile according to claim 1, wherein: in step S5, the laser welding operation is performed in air or an oxidizing atmosphere.
9. A welded joint produced by the laser welding method according to claims 1 to 8, characterized in that: the microstructure of the welded joint is lath martensite.
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| CN111215751B (en) * | 2019-03-29 | 2022-06-28 | 宝山钢铁股份有限公司 | Steel poor-strength welding part with aluminum or aluminum alloy coating and manufacturing method thereof |
| CN110293312A (en) * | 2019-07-26 | 2019-10-01 | 苏州大学 | A kind of preparation method of the drop stamping material of aluminium silicon cladding steel |
| CN110587135B (en) * | 2019-08-14 | 2021-09-24 | 上海宝钢阿赛洛激光拼焊有限公司 | Welding method for preventing laser tailor-welded blank from stamping and cracking |
| CN110681997B (en) * | 2019-10-08 | 2021-10-15 | 上海交通大学 | Pulse laser tailor-welding method for hot-formed steel plate with Al-Si coating |
| CN112404129B (en) * | 2020-10-27 | 2023-05-02 | 苏州大学 | Welding method of steel plate for hot-rolled automobile |
| CN114473237B (en) * | 2022-02-18 | 2023-09-22 | 广东亚图科技股份有限公司 | Four-class library and laser processing method thereof |
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