CN114682913A - Laser tailor-welding device and method with welding back chilling - Google Patents
Laser tailor-welding device and method with welding back chilling Download PDFInfo
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- CN114682913A CN114682913A CN202210328778.XA CN202210328778A CN114682913A CN 114682913 A CN114682913 A CN 114682913A CN 202210328778 A CN202210328778 A CN 202210328778A CN 114682913 A CN114682913 A CN 114682913A
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- 238000003466 welding Methods 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 69
- 230000009471 action Effects 0.000 claims abstract description 11
- 238000003860 storage Methods 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 76
- 229910052757 nitrogen Inorganic materials 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 37
- 239000007921 spray Substances 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 9
- 229910000734 martensite Inorganic materials 0.000 abstract description 5
- 239000004033 plastic Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 13
- 239000000835 fiber Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
-
- 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
- B23K26/08—Devices involving relative movement between laser beam and workpiece
-
- 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
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
- B23K26/1462—Nozzles; Features related to nozzles
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to a welding-following back-chilled laser tailor-welding device and a method, which comprises a back welding-following active cooling module, a self-walking welding clamping platform and a laser welding system, wherein the back welding-following active cooling module comprises a storage device, a lead-in device and a back cooling base, a nozzle is arranged on the upper surface of the back cooling base, a gap is reserved between the nozzle and a workpiece, the central lines of the nozzles on two sides and the laser welding action position are positioned on the same plane, and the nozzle is divided into two sides to cool a heat-affected zone on the back surface of a welding seam; and the self-walking welding clamping platform is used for clamping a workpiece and driving the workpiece to move. The advantages are that: forced convection cooling is added to the back of the weld joint, particularly aiming at heat affected zones on two sides of the weld joint, the cooling speed of the heat affected zones on the two sides is improved, a tempered martensite generation area is reduced, and the range of a softening area is controlled; the heat transfer from the molten pool to the periphery is blocked, and the uncoordinated strain area is reduced; the plastic deformation of the high temperature area is compensated by the temperature difference stretching effect of the two sides.
Description
Technical Field
The invention belongs to the technical field of welding, and relates to a laser tailor-welding device and method with a welding back chilling function.
Background
In order to meet the increasingly stringent requirements for light weight of automobiles, the strength level of advanced high-strength steel is continuously improved, and laser tailor-welding is widely applied as a common light-weight structure. At present, the problems of softening of a heat affected zone, stress concentration of a welding line and the like generally exist in the laser tailor-welding process of dual-phase steel, quenching distribution steel and hot forming steel above 1180 MPa. The ultra-high strength automobile steel generally contains a martensite strengthening phase, and martensite tempering is performed on one side of a heat affected zone close to a base material during laser welding, so that the zone is softened. Compared with the ultrahigh strength of the parent material, the hardness and the strength of the area are obviously reduced, and the area can be preferentially broken when being loaded. On the other hand, due to uneven heating of all areas of the welding seam, the tensile plastic strain generated in the cooling stage of the welding seam is not enough to compensate the compressive plastic strain generated in the heating process, and the residual plastic strain after welding results in welding residual stress and deformation. The higher the strength grade of the high-strength steel, the greater the generated post-weld residual stress, the higher the risk of cracking, and the lower the bearing capacity of the joint.
In order to solve the problems of joint softening and residual stress after welding, methods such as prestretching, local heating, chilling along with welding, ultrasonic impact along with welding, rolling along with welding and the like are adopted at home and abroad. Such as: the publication number is CN110834149A, and Chinese patent discloses a laser welding device with a cooling system and a method, and the method cools a welding seam through laser coaxial water mist front side, thereby avoiding crystal grains in the welding seam from growing up, reducing softening phenomenon and improving welding seam strength. However, the water mist coaxially sprayed by the laser influences plasma sprayed by the small laser holes to a certain extent, and welding heat input is reduced; on the other hand, the front coaxial cooling water mist is easy to enter the welding seam to cause pollution.
The publication number is CN108453384A, and Chinese patent discloses a laser welding joint softening method for reducing manganese steel in high strength-elongation product, which improves the cooling speed of a welding seam and reduces the martensite tempering degree of a heat affected zone by heat conduction between an active cooling base made of red copper on the back and the back of the welding seam. The effect of improving the cooling speed by the heat conduction of the red copper base is limited, and the method is only applied to high-strength steel with the tensile strength of 756-819MPa and has a narrow application range.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a laser tailor-welding device and a laser tailor-welding method with welding back chilling, which solve the problem of joint softening generated in the laser tailor-welding process of high-strength steel, can add forced convection cooling to the back of a welding seam, effectively reduce the range of a softening region and reduce the residual stress after welding.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a laser tailor-welding device with welding-following back chilling comprises a back weld-following active cooling module, a self-walking welding clamping platform and a laser welding system, wherein the back weld-following active cooling module comprises a storage device, a leading-in device and a back cooling base, a nozzle is arranged on the upper surface of the back cooling base, a gap is reserved between the nozzle and a workpiece, the central lines of the nozzles on two sides and the action position of laser welding are located on the same plane, and the nozzle is divided into two sides to cool a heat affected zone on the back side of a welding seam; and the self-walking welding clamping platform is used for clamping a workpiece and driving the workpiece to move.
The liquid nitrogen cooling device is characterized by further comprising a liquid nitrogen tank, a liquid nitrogen pump and a spray gun, wherein the liquid nitrogen tank is connected with the spray gun through the liquid nitrogen pump, and the liquid nitrogen is introduced into a nozzle of the back cooling base through the spray gun.
The self-walking welding clamping platform comprises a clamp and a base, a workpiece to be welded is fixed on the base through the clamp, the cross section of a back cooling base is trapezoidal, a trapezoidal opening matched with the cross section of the back cooling base is formed in the back of the base, and a rubber gasket with the thickness of 1-2mm is arranged between the back cooling base and the base.
The back cooling base in be equipped with the buffer memory platform, the lateral part of back cooling base is opened has the spraying input port, and the top is fixed with the spout, the intercommunication has the buffer memory platform between spraying input port and the spout.
The bottom surface of the cache platform is an arc surface.
The buffer storage platform is communicated with the spray input port through a transition flow passage.
The nozzles are arranged in more than one row, and each row of nozzles corresponds to one buffer platform.
A laser tailor-welding method with welding back chilling comprises the following steps:
1) clamping and fixing a workpiece to be welded on a self-walking welding clamping platform, wherein a nozzle, a laser welding action point and a part to be welded are coaxially arranged, and the nozzle is arranged below two sides of a welding line formed after welding;
2) adjusting a liquid nitrogen pump to change the flow of a cooling medium and the temperature of the cooling medium at an input end, adjusting the distance between the nozzles at two sides to change the cooling range at two sides of the back, and obliquely designing the nozzles to change the angle of the discharged cooling medium;
3) simultaneously starting a laser heat source and a liquid nitrogen tank of the laser welding system, inputting liquid nitrogen into a nozzle, wherein the distance between the outlet of the nozzle and a laser action point is 0-40 mm;
4) the workpiece to be welded moves along with the self-walking welding clamping platform to be welded to form a linear or curved welding line.
The workpiece is made of high-strength steel.
Compared with the prior art, the invention has the beneficial effects that:
forced convection cooling is added to the back of the weld joint, particularly aiming at heat affected zones on two sides of the weld joint, the cooling speed of the heat affected zones on the two sides is increased, a tempered martensite generation area is reduced, and the range of a softening area is controlled; the heat transfer from the molten pool to the periphery is blocked, and the uncoordinated strain area is reduced; the plastic deformation of the high temperature area is compensated by the temperature difference stretching effect of the two sides. Specifically, the method comprises the following steps:
1. the invention adopts a back strong cooling mode to control the softening of the high-strength steel laser welding joint, and the back is applied with a cooling medium, so that the pollution effect of front cooling on the welding seam can be avoided, and the phenomenon that the cooling medium is agglomerated at a laser small hole to influence the heating effect of photoinduced plasma on the surface of the material can be avoided.
2. The back is subjected to forced convection and welding chilling aiming at heat affected zones on two sides of a welding seam, cooling media are output intensively, and the joint softening control effect is good; the cooling output is linear and continues for a certain distance, so that the chilling time is prolonged, and the control effect of softening the joint under the condition of high-speed welding is ensured.
3. In the welding process, the laser source and the back chilling source are kept still, and a workpiece to be welded moves, so that the heat energy absorption effect is prevented from being weakened in the moving process of the cooling source, the synchronization difficulty of the welding system and the back cooling system is reduced, and the continuous and stable welding process and cooling process are ensured.
Drawings
FIG. 1 is a schematic structural diagram of a laser tailor-welding device with welding back chilling.
FIG. 2 is a schematic view of the working state of the laser tailor-welding device with the back chilled.
FIG. 3 is a first schematic view of a back cooling base.
FIG. 4 is a second schematic structural view of the backside cooling base.
Fig. 5 is a schematic view of the internal structure of the back cooling base.
In the figure: 1-base 2-workpiece 3-laser head 4-clamp 5-spray input port 6-transition flow channel 7-buffer storage platform 8-spray output pipeline 9-back cooling seat 10-liquid nitrogen pump 11-liquid nitrogen tank.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.
Referring to the figures 1-5, the back-along-welding chilling laser tailor-welding device comprises a back-along-welding active cooling module, a self-walking welding clamping platform and a laser welding system, wherein the back-along-welding active cooling module comprises a storage device, a guide-in device and a back cooling base, a nozzle is arranged on the upper surface of the back cooling base, a gap is reserved between the nozzle and a workpiece 2, the central lines of the nozzles on two sides and the laser welding action position are located on the same plane, and the nozzle is divided into two sides to cool a heat-affected zone on the back surface of a welding seam; the self-walking welding clamping platform is used for clamping the workpiece 2 and driving the workpiece 2 to move.
The laser tailor-welding device with the welding back chilling further comprises a liquid nitrogen tank 11, a liquid nitrogen pump 10 and a spray gun, wherein the liquid nitrogen tank 11 is connected with the spray gun through the liquid nitrogen pump 10, and liquid nitrogen is introduced into a nozzle of the back cooling base through the spray gun. The liquid nitrogen storage tank, the liquid nitrogen pump 10 and the middle transmission pipe are externally insulated and wrapped.
The self-walking welding clamping platform comprises a clamp 4 and a base 1, a workpiece 2 to be welded is fixed on the base 1 through the clamp 4, the cross section of a back cooling base is trapezoidal, a trapezoidal opening matched with the cross section of the back cooling base is formed in the back of the base 1, and a rubber gasket with the thickness of 1-2mm is arranged between the back cooling base and the base 1.
Be equipped with buffer memory platform 7 in the back cooling base, the lateral part of back cooling base is opened there is spraying input port 5, and the top is fixed with the spout, and the intercommunication has buffer memory platform 7 between spraying input port 5 and the spout, and the liquid nitrogen vaporizes at buffer memory platform 7, and buffer memory platform 7's bottom surface is the cambered surface, makes the nitrogen flow of each spout balanced. The buffer platform 7 is communicated with the spray input port 5 through a transition flow passage 6. A temperature sensor for measuring the temperature of the liquid nitrogen stream is provided at the spray inlet 5. The nozzles are arranged in more than one row, each row of nozzles corresponds to one cache platform 7, taking two rows as an example, the two rows of nozzles correspond to two sides of a welding line, the laser action points coaxially correspond to the back of the bottom side of the workpiece 2 by a certain distance, and heat affected zones on two sides of the welding line can be cooled on two sides.
In addition, the welding system includes a welding laser head 3 for forming a weld or a weld spot by laser heating, such as laser tailor welding, laser lap welding, and laser spot welding, and a transverse air blowing curtain, a coaxial or non-coaxial shielding gas system, and the like.
A laser tailor-welding method with welding back chilling comprises the following steps:
1) clamping and fixing the workpiece 2 to be welded on a self-walking welding clamping platform, or fixing the workpiece 2 to be welded on the base 1 by adopting a magnetic suction mode and the like; the centers of the nozzles at the two sides, the laser welding action point and the part to be welded are coaxially arranged, and the nozzles are arranged below the two sides of a welding line formed after welding; and (4) observing and judging the interval of the heat affected zone through the macroscopic morphology of the weld joint, and selecting the back cooling base with the same nozzle interval.
2) Test conditions are set according to the strength grade and the expected cooling effect of the welded workpiece 2, the liquid nitrogen pump 10 is adjusted to change the flow of the cooling medium and the temperature of the cooling medium at the input end, the distance between the nozzles at the two sides is adjusted to change the cooling range at the two sides of the back, and the nozzles are obliquely designed to change the angle of the discharged cooling medium.
3) Simultaneously starting a laser heat source of the laser welding system and a liquid nitrogen tank 11, inputting liquid nitrogen into a nozzle, wherein the distance between the outlet of the nozzle and a laser action point is 0-40 mm; the base 1 integrally moves in the welding process, and the laser source and the back cooling source are stable and do not move;
4) the workpiece 2 to be welded moves along with the self-walking welding clamping platform to be welded to form a linear or curved welding line.
The workpiece 2 is made of high-strength steel or ultrahigh-strength steel, and the method is particularly suitable for welding plates.
Example 1:
a fiber laser is adopted to perform laser tailor-welding on a DP1180 ultra-high-strength steel sheet with the thickness of 1.4mm, and the sheet is machined into a size of 300mm multiplied by 100mm before welding.
The laser tailor-welding method with the welding back chilling is realized based on the following devices in the embodiment: work piece 2 is installed on base 1 through key anchor clamps 4, and 2 tops of work piece have laser head 3 to carry out optic fibre laser welding to the tailor-welded position, treat that welding work piece 2 below solder joint back 15mm department sets up the 9 spouts of back cooling seat, and 3 focuses of laser head, 9 both sides spouts centers of back cooling seat and tailor-welded weld are on same straight line. Liquid nitrogen is led out from a liquid nitrogen tank 11, is led into a spray input port 5 through a liquid nitrogen pump 10, is shunted to buffer platforms 7 on two sides through a transition flow channel 6, is upwards output through an upper spray output pipeline 8, is output through a nozzle, and is subjected to forced convection cooling. In the present case, 10 vertical spray outlet pipes 8 are provided in a single row with a continuous spacing of 20 mm. The laser welding heat affected zone characteristic is welded by DP1180 laser, and four rows of spray output pipelines 8 are arranged on two sides of the laser welding heat affected zone characteristic, the distance between the two sides is 1.2mm, and the distance between the two rows of output pipelines on one side is 1 mm.
The welding process is shown in tables 1 and 2, the microhardness of the softening zone at the same position from the center of the welding seam before and after measurement is carried out, and the result is shown in tables 1 and 2, so that the hardness of the tempering softening zone of the welding seam is effectively improved. After the back chilling regulation and control along with welding, the single-side buckling deformation after welding is effectively controlled. The surface residual stress of the center position of the welding seam is detected through X-ray nondestructive testing, and the residual tensile stress is obviously reduced.
TABLE 1DP1180 Pre-Regulation Process parameters
TABLE 2DP1180 Process parameters following backside quench control
Example 2:
and (3) carrying out laser tailor-welding on the QP980 ultrahigh-strength steel sheet with the thickness of 2mm by adopting a fiber laser, and machining into 300mm multiplied by 100mm before welding.
A laser tailor-welding method with welding back chilling is realized in the embodiment based on the following devices: work piece 2 is installed on base 1 through key anchor clamps 4, and 2 tops of work piece have laser head 3 to carry out optic fibre laser welding to the tailor-welded position, treat that welding work piece 2 below solder joint back 15mm department sets up the 9 spouts of back cooling seat, and 3 focuses of laser head, 9 both sides spouts centers of back cooling seat and tailor-welded weld are on same straight line. Liquid nitrogen is led out from a liquid nitrogen tank 11, is led into a spray input port 5 through a liquid nitrogen pump 10, is shunted to cache platforms 7 on two sides through a transition flow channel 6, is upwards output through an upper spray output pipeline 8, is output through a nozzle, and is subjected to forced convection cooling.
In this case, 9 vertical spray outlet pipes 8 are provided in a single row with a continuous spacing of 18 mm. The laser welding heat affected zone characteristic is welded by DP1180 laser, and four rows of output pipelines are arranged on two sides of the laser welding heat affected zone characteristic, wherein the distance between the two sides is 1.4mm, and the distance between the two rows of output pipelines on one side is 1 mm.
The welding process is shown in tables 3 and 4, the microhardness of the softening zone at the same position from the center of the welding seam before and after measurement is carried out, and the result is shown in tables 3 and 4, so that the hardness of the tempering softening zone of the welding seam is effectively improved. In addition, after the back chilling regulation and control along with welding, the single-side warping deformation after welding is effectively controlled. After the back chilling regulation and control along with welding, the single-side buckling deformation after welding is effectively controlled. The surface residual stress of the center position of the welding seam is detected through X-ray nondestructive testing, and the residual tensile stress is obviously reduced.
TABLE 3QP980 Pre-Regulation Process parameters
TABLE 4QP980 post-regulation process parameters with welding back chilling
Claims (9)
1. A laser tailor-welding device with a welding-following back chilling function is characterized by comprising a back welding-following active cooling module, a self-walking welding clamping platform and a laser welding system, wherein the back welding-following active cooling module comprises a storage device, a leading-in device and a back cooling base, a nozzle is arranged on the upper surface of the back cooling base, a gap is reserved between the nozzle and a workpiece, the central lines of the nozzles on two sides and the laser welding action position are located on the same plane, and the nozzle is divided into two sides to cool a heat affected zone on the back side of a welding seam; the self-walking welding clamping platform is used for clamping a workpiece and driving the workpiece to move.
2. The welding-following back-chilled laser tailor-welding device according to claim 1, further comprising a liquid nitrogen tank, a liquid nitrogen pump and a spray gun, wherein the liquid nitrogen tank is connected with the spray gun through the liquid nitrogen pump, and the liquid nitrogen is introduced into a nozzle of the back cooling base through the spray gun.
3. The back-chilled laser tailor-welding device with welding according to claim 1, wherein the self-walking welding clamping platform comprises a clamp and a base, a workpiece to be welded is fixed on the base through the clamp, the cross section of the back cooling base is trapezoidal, the back of the base is provided with a trapezoidal opening matched with the cross section of the back cooling base, and a rubber gasket with the thickness of 1-2mm is arranged between the back cooling base and the base.
4. The back-chilled laser tailor-welding device according to claim 1, wherein a buffer platform is arranged in the back cooling base, a spray inlet is arranged on the side of the back cooling base, a nozzle is fixed on the top of the back cooling base, and the buffer platform is communicated between the spray inlet and the nozzle.
5. The laser tailor-welded device with back chilled according to claim 4, wherein the bottom surface of the buffer platform is a cambered surface.
6. The back-chilled along with welding laser tailor-welded assembly according to claim 4, wherein the buffer platform is in communication with the spray inlet via a transition flow channel.
7. A weld-backing chilled laser tailor-welding apparatus according to claim 4, wherein the nozzles are arranged in more than one row, each row corresponding to a buffer platform.
8. A welding-back-chilled laser tailor-welding method realized by the device according to the claim 1-7, characterized by comprising the following steps:
1) clamping and fixing a workpiece to be welded on a self-walking welding clamping platform, wherein a nozzle, a laser welding action point and a part to be welded are coaxially arranged, and the nozzle is arranged below two sides of a welding line formed after welding;
2) adjusting a liquid nitrogen pump to change the flow of a cooling medium and the temperature of the cooling medium at an input end, adjusting the distance between the nozzles at two sides to change the cooling range at two sides of the back, and obliquely designing the nozzles to change the angle of the discharged cooling medium;
3) simultaneously starting a laser heat source and a liquid nitrogen tank of the laser welding system, inputting liquid nitrogen into a nozzle, wherein the distance between the outlet of the nozzle and a laser action point is 0-40 mm;
4) the workpiece to be welded moves along with the self-walking welding clamping platform to be welded to form a linear or curved welding line.
9. The welding-following back-chilled laser tailor-welding method according to claim 8, wherein the workpiece is made of high-strength steel.
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| CN110860795A (en) * | 2019-12-12 | 2020-03-06 | 大连理工大学 | Laser welding method combining welding-following ultrasound and chilling |
| CN113245701A (en) * | 2021-04-14 | 2021-08-13 | 哈尔滨焊接研究院有限公司 | Method and device for reducing stress and deformation of narrow-gap laser filler wire welding head of titanium alloy thick plate |
| CN113547215A (en) * | 2021-08-23 | 2021-10-26 | 上海交通大学 | Welding device for strengthening and toughening ultrahigh-strength steel welding joint based on self-distribution |
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