Magnetic field auxiliary rolling laser welding device

Abstract

The invention relates to the technical field of laser welding, and provides a magnetic field auxiliary rolling laser welding device which comprises a welding platform, a supporting frame is fixedly connected to the bottom of the welding platform, a mounting frame is fixedly connected to the top of the supporting frame, and a movable seat penetrating through the top wall of the mounting frame is slidably connected to the top of the mounting frame. A translation mechanism for driving the movable seat to reciprocate in the horizontal direction is arranged at the top end of the movable seat, a laser welding assembly for welding a metal part is arranged on one side of the movable seat, and a protective gas injection mechanism is arranged on the other side of the movable seat; a rolling mechanism used for rolling the welding position of the metal piece is arranged at the bottom of the movable base, and a magnetic field generator is fixedly installed on the inner side of the welding platform. By means of the magnetic field generator arranged in the welding platform, a controllable electromagnetic field is applied in the welding process, the magnetic field acts on a molten pool, turbulent flow and metal steam splashing are restrained, and the defects of air holes, inclusions and microcracks are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and in particular to a magnetic field assisted roller laser welding device. Background Art

[0002] Laser welding technology is widely used in the field of precision manufacturing due to its advantages such as high energy density, small heat-affected zone and low deformation.

[0003] After searching, the Chinese patent (publication number: CN113165112A) disclosed "a laser welding device, provided with a gas nozzle including an optical path hole and an injection portion, the laser passes through the optical path hole, the injection portion is toward the irradiation direction side of the laser and toward the optical axis side, and an inert gas is injected into the optical path hole, and the inert gas is used to shield the metal vapor ejected from the workpiece toward the laser transmission window side when the workpiece is welded using the laser. Therefore, unlike the case where the workpiece is only filled with inert gas, by making the inert gas injected from the injection portion toward the irradiation direction side of the laser and toward the optical axis side contact the metal vapor from the workpiece toward the laser transmission window when the welding workpiece is welded, the intensity of the metal vapor ejected from the workpiece can be weakened and pushed back, thereby effectively blocking the metal vapor from the workpiece toward the laser transmission window."

[0004] However, this type of device still has the following technical bottlenecks when welding high-reflectivity metals (such as aluminum alloys, copper alloys) or dissimilar materials:

[0005] First, the molten pool has poor stability: the metal molten pool is affected by factors such as surface tension and thermal convection, which easily produces turbulence, resulting in defects such as pores, inclusions and microcracks in the weld, which is especially significant during high-speed welding.

[0006] Second, insufficient oxidation and protection: Existing shielding gas injection mechanisms mostly use fixed nozzles, which have limited gas coverage. When welding long welds, the gas cannot evenly cover the dynamic weld pool, causing localized oxidation and reducing joint strength and corrosion resistance.

[0007] Third, insufficient joint strength: When the metal surfaces are not tightly fitted during welding, unfused welds can easily occur. Traditional roller pressing devices typically apply pressure statically, making it difficult to dynamically adjust the pressure in real time to reflect the welding heat process.

[0008] Fourth, residual stress and grain coarsening: rapid cooling leads to residual stress in the weld area, and disordered crystallization in the molten pool easily forms coarse grains, which reduces the mechanical properties of the joint.

[0009] In view of this, the present invention proposes a magnetic field assisted roller laser welding device. Summary of the Invention

[0010] The present invention provides a magnetic field assisted roller laser welding device, which solves the problem of poor molten pool stability in the prior art.

[0011] The technical solution of the present invention is as follows: A magnetic field-assisted roller-pressing laser welding device comprises a welding platform, the bottom of the welding platform is fixedly connected to a support frame, the top of the support frame is fixedly connected to a mounting frame, the top of the mounting frame is slidably connected to a movable seat that passes through the top wall of the mounting frame, the top of the movable seat is provided with a translation mechanism for driving the movable seat to reciprocate in the horizontal direction, one side of the movable seat is provided with a laser welding assembly for welding metal parts, the other side of the movable seat is provided with a protective gas injection mechanism for spraying protective gas onto the welding point of the metal part, the bottom of the movable seat is provided with a rolling mechanism for rolling the welding point of the metal part, and a magnetic field generator is fixedly installed on the inner side of the welding platform.

[0012] Preferably, the translation mechanism includes two fixed seats arranged in parallel, and the two fixed seats are respectively fixedly connected to the two ends of the top of the mounting frame. A reciprocating screw is rotatably connected between the two fixed seats, and the reciprocating screw passes through the movable seat and is threadedly connected to the movable seat. A motor is fixedly installed on the outer side of one of the fixed seats, and the output shaft of the motor is fixedly connected to the reciprocating screw. A guide groove that slides with the movable seat is provided on the top of the mounting frame.

[0013] Preferably, a guide plate is fixedly connected to the top of the movable seat, and guide wheels are rotatably connected to both ends of the guide plate, and the bottom ends of the two guide wheels are in contact with the top wall of the mounting frame.

[0014] Preferably, the laser welding assembly includes a connecting frame 1 fixedly connected to one side of the movable seat, one end of the connecting frame 1 is fixedly connected to a mounting seat 1, the inner side of the mounting seat 1 is rotatably connected to a laser emitter, the input end of the laser emitter is fixedly connected to a fiber optic connector, the bottom end of the connecting frame 1 is hinged to a cylinder, and the output end of the cylinder is hinged to the outer wall of the laser emitter.

[0015] Preferably, the rolling mechanism includes a connecting plate fixedly connected to the bottom of the movable seat, both ends of the connecting plate are fixedly connected to electric push rods, the output ends of the two electric push rods are fixedly connected to the same mounting seat 2, and the inner side of the mounting seat 2 is rotatably connected to a pressure roller.

[0016] Preferably, the protective gas injection mechanism includes a connecting frame 2 fixedly connected to one side of the movable seat, one end of the connecting frame 2 is fixedly connected to the mounting frame, the bottom end of the inner side of the mounting frame is rotatably connected to a plurality of nozzles equidistantly distributed along the length direction of the mounting frame, the inlet ends of several of the nozzles are fixedly connected to an air guide hose, the inlet ends of several of the air guide hoses are fixedly connected to the same diverter pipe, and the inlet end of the diverter pipe is externally connected to a protective gas supply device.

[0017] Preferably, the protective gas injection mechanism also includes several gears 1 coaxially fixedly connected to the nozzle, a gear 2 is meshed between two adjacent gears 1, the gears 2 are rotatably connected to the bottom wall of the mounting frame, and the top of one of the gears 2 is fixedly connected to a rotating shaft, and the top of the rotating shaft is provided with a linkage part that drives the rotating shaft to rotate back and forth by cooperating with the translation of the movable seat.

[0018] Preferably, the linkage part includes a pulley 1 fixedly connected to the top of the rotating shaft, one end of the top of the mounting frame is rotatably connected to the pulley 2 through a pin shaft, the pulley 2 is connected to the pulley 1 through a belt transmission, the pulley 2 is coaxially fixedly connected to a gear 3, the inner wall of the mounting frame is fixedly connected to a plurality of tooth plates equidistantly distributed along the length direction of the mounting frame, the gear 3 is intermittently meshed with the tooth plate by cooperating with the translation of the movable seat, a torsion spring is sleeved on the pin shaft of the gear 3, the top end of the torsion spring is welded to the gear 3, and the bottom end of the torsion spring is welded to the top wall of the mounting frame.

[0019] Preferably, a control box is fixedly connected to the outer side of the mounting frame, and the control box is provided with a laser adjustment device electrically connected to the laser emitter. The control box is also provided with a flow control device electrically connected to the protective gas supply equipment.

[0020] Preferably, the control box is also provided with a magnetic field regulating device electrically connected to the magnetic field generator. The magnetic field regulating device adjusts the strength and size of the magnetic field by adjusting the current size and current frequency in the magnetic field generator. The maximum current is 30mA and the maximum magnetic field frequency is 50Hz.

[0021] The working principle and beneficial effects of the present invention are:

[0022] 1. The welding platform's built-in magnetic field generator applies a controllable electromagnetic field during the welding process. The magnetic field acts on the molten pool, suppressing turbulence and metal vapor splashing, reducing porosity, inclusions, and microcracks. Simultaneously, the magnetic field refines the grain structure and optimizes the weld's mechanical properties (such as tensile strength and toughness). This makes it particularly suitable for welding highly reflective metals (aluminum alloys, copper alloys) and dissimilar materials.

[0023] 2. The shielding gas injection mechanism drives multiple nozzles to synchronously reciprocate through a linkage. As the movable seat translates, gear 3 meshes with the toothed plate, driving the nozzles to rotate, which then automatically resets in conjunction with a torsion spring. This dynamic injection pattern expands gas coverage, ensuring uniform oxygen isolation across the weld pool, preventing localized oxidation in the weld and improving corrosion resistance.

[0024] 3. The roller pressing mechanism uses an electric push rod to control the roller height, applying forced pressure to the metal parts during the welding process. The pressure value can be dynamically adjusted according to the welding heat process to ensure a tight fit between the metal layers and eliminate the lack of fusion defects. It is particularly suitable for high-speed welding scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a schematic diagram of the structure of a magnetic field assisted roller laser welding device of the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the structure of a magnetic field assisted roller laser welding device of the present invention. Figure 2 ;

[0028] Figure 3 It is a schematic diagram of the local structure of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the translation mechanism of the present invention;

[0030] Figure 5 It is a schematic structural diagram of the laser welding assembly of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the rolling mechanism of the present invention;

[0032] Figure 7 Schematic diagram of the structure of the protective gas injection mechanism of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the linkage part of the present invention.

[0034] Figure: 1, welding platform; 2, support frame; 3, mounting frame; 4, movable seat; 5, translation mechanism; 51, fixed seat; 52, reciprocating screw; 53, motor; 54, guide groove; 55, guide plate; 56, guide wheel; 6, laser welding assembly; 61, connecting frame 1; 62, mounting seat 1; 63, laser transmitter; 64, optical fiber connector; 65, cylinder; 7, rolling mechanism; 71, connecting plate; 72, electric push rod; 7 3. Mounting seat 2; 74. Pressure roller; 8. Protective gas injection mechanism; 81. Connecting frame 2; 82. Mounting frame; 83. Gear 1; 84. Nozzle; 85. Gear 2; 86. Air guide hose; 87. Diverter pipe; 88. Rotating shaft; 89. Linkage part; 891. Pulley 1; 892. Pulley 2; 893. Gear 3; 894. Tooth plate; 895. Torsion spring; 9. Control box; 10. Metal parts; 11. Magnetic field generator. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] like Figures 1 to 8 As shown, this embodiment proposes a magnetic field-assisted roller-pressing laser welding device, including a welding platform 1, the bottom of the welding platform 1 is fixedly connected to a support frame 2, the top of the support frame 2 is fixedly connected to a mounting frame 3, the top of the mounting frame 3 is slidably connected to a movable seat 4 that passes through the top wall of the mounting frame 3, the top of the movable seat 4 is provided with a translation mechanism 5 for driving the movable seat 4 to reciprocate in the horizontal direction, one side of the movable seat 4 is provided with a laser welding assembly 6 for welding a metal part 10, the other side of the movable seat 4 is provided with a protective gas injection mechanism 8 for injecting protective gas into the welding part of the metal part 10, the bottom of the movable seat 4 is provided with a rolling mechanism 7 for rolling the welding part of the metal part 10, and a magnetic field generator 11 is fixedly installed on the inner side of the welding platform 1.

[0037] The laser welding assembly 6 provides a high-energy laser beam to heat and melt the joint area of ​​the metal part 10 to form a molten pool and complete the welding task. At the same time, the translation mechanism 5 is started to drive the movable seat 4 to reciprocate in the horizontal direction, so that the rolling mechanism 7 applies a certain pressure during the welding process to ensure that the metal surfaces in the welding area are in close contact, thereby improving the fluidity of the metal, enhancing the bonding of the joint, and preventing the generation of pores or cracks; the protective gas injection mechanism 8 can inject protective gas into the joint area of ​​the metal part 10 to protect the welding area from oxygen contamination and prevent oxidation or the formation of other harmful gases; the magnetic field generator 11 helps control the fluidity and grain structure of the metal molten pool by generating an electromagnetic field, avoiding the generation of welding defects (such as bubbles, inclusions) and cracks, inhibiting the generation of intermetallic compounds, and improving the quality of the welded joint.

[0038] Furthermore, the translation mechanism 5 includes two parallel fixed seats 51, and the two fixed seats 51 are respectively fixedly connected to the two ends of the top of the mounting frame 3. A reciprocating screw 52 is rotatably connected between the two fixed seats 51, and the reciprocating screw 52 passes through the movable seat 4 and is threadedly connected to the movable seat 4. A motor 53 is fixedly installed on the outer side of one of the fixed seats 51, and the output shaft of the motor 53 is fixedly connected to the reciprocating screw 52. A guide groove 54 that slides with the movable seat 4 is provided on the top of the mounting frame 3, and a guide plate 55 is fixedly connected to the top of the movable seat 4. Both ends of the guide plate 55 are rotatably connected to guide wheels 56, and the bottom ends of the two guide wheels 56 are in contact with the top wall of the mounting frame 3.

[0039] By starting the motor 53 to drive the reciprocating screw 52 to rotate, the movable seat 4 is reciprocated along the axial direction of the reciprocating screw 52, ​​so that the laser welding assembly 6 is synchronously translated and the metal part 10 is continuously welded. At the same time, the rolling mechanism 7 is synchronously rolled on the joint area of ​​the metal part 10 to ensure that the metal surface of the welding area is in close contact; the two guide wheels 56 can provide auxiliary support force for the movable seat 4 to ensure that the guide plate 55 moves smoothly.

[0040] Furthermore, the laser welding assembly 6 includes a connecting frame 61 fixedly connected to one side of the movable seat 4, one end of the connecting frame 61 is fixedly connected to a mounting seat 62, the inner side of the mounting seat 62 is rotatably connected to a laser emitter 63, the input end of the laser emitter 63 is fixedly connected to a fiber optic connector 64, the bottom end of the connecting frame 61 is hinged to a cylinder 65, and the output end of the cylinder 65 is hinged to the outer wall of the laser emitter 63.

[0041] The optical fiber transmission system is connected through the optical fiber connector 64 to transmit the laser beam from the laser emitter to the welding area. The optical fiber has a high transmission efficiency and can efficiently transmit laser energy. The laser emitter 63 is driven to rotate to adjust the angle by controlling the cylinder 65, so as to meet the actual welding angle requirements; the laser emitter 63 emits a high-energy laser beam to heat and melt the joint area of ​​the metal part 10 to form a molten pool and complete the welding task. The optical fiber laser 63 has the advantages of high efficiency and long life, and is suitable for high-precision welding operations.

[0042] Furthermore, the rolling mechanism 7 includes a connecting plate 71 fixedly connected to the bottom of the movable seat 4, and both ends of the connecting plate 71 are fixedly connected to electric push rods 72. The output ends of the two electric push rods 72 are fixedly connected to the same mounting seat 2 73, and the inner side of the mounting seat 2 73 is rotatably connected to a pressure roller 74.

[0043] By controlling the electric push rod 72 to drive the mounting seat 2 73 to move downward, the pressure roller 74 moves downward to contact the metal part 10, so that the pressure roller 74 applies pressure to the welding area of ​​the metal part 10, ensuring that the metal surface of the welding area is in close contact, thereby improving the fluidity of the metal, enhancing the bonding of the joint, and preventing the generation of pores or cracks.

[0044] Furthermore, the protective gas injection mechanism 8 includes a connecting frame 2 81 fixedly connected to one side of the movable seat 4, one end of the connecting frame 2 81 is fixedly connected to the mounting frame 82, and the bottom end of the inner side of the mounting frame 82 is rotatably connected to a plurality of nozzles 84 equidistantly distributed along the length direction of the mounting frame 82, the inlet ends of the plurality of nozzles 84 are fixedly connected to a gas guide hose 86, the inlet ends of the plurality of gas guide hoses 86 are fixedly connected to the same diversion pipe 87, the inlet end of the diversion pipe 87 is externally connected to a protective gas supply device (nitrogen or argon supply device), the plurality of nozzles 84 are coaxially fixedly connected to a gear 1 83, a gear 2 85 is engaged between two adjacent gears 1 83, the gear 2 85 is rotatably connected to the bottom wall of the mounting frame 82, the top of one of the gears 2 85 is fixedly connected to a rotating shaft 88, and the top of the rotating shaft 88 is provided with a linkage member 89 that drives the rotating shaft 88 to rotate back and forth by cooperating with the translation of the movable seat 4.

[0045] The shielding gas is introduced into the diversion pipe 87 through the shielding gas supply equipment, and then introduced into the corresponding nozzle 84 through each gas guide hose 86, and the shielding gas is sprayed onto the welding area of ​​the metal part 10 through the nozzle 84, so that the welding area can be protected from oxygen contamination and oxidation or the formation of other harmful gases can be prevented; at the same time, the translation of the movable seat 4 is coordinated to make the rotating shaft 88 rotate back and forth, so that the corresponding gear 2 85 mechanically rotates back and forth, so that all gears 1 83 rotate back and forth synchronously, and all nozzles 84 swing back and forth, so that the nozzle 84 can dynamically spray the shielding gas, which can greatly increase the coverage area of ​​the shielding gas, so that the welding area of ​​the metal part 10 can be completely covered by the shielding gas, thereby improving the protection effect of the welding area of ​​the metal part 10.

[0046] Furthermore, the linkage part 89 includes a pulley 1 891 fixedly connected to the top of the rotating shaft 88, and one end of the top of the mounting frame 82 is rotatably connected to the pulley 2 892 through a pin shaft. The pulley 2 892 is connected to the pulley 1 891 through a belt drive, and the pulley 2 892 is coaxially fixedly connected to the gear 3 893. The inner wall of the mounting frame 3 is fixedly connected to a plurality of tooth plates 894 equidistantly distributed along the length direction of the mounting frame 3. The gear 3 893 intermittently meshes with the tooth plate 894 by cooperating with the translation of the movable seat 4. A torsion spring 895 is sleeved on the pin shaft of the gear 3 893, the top end of the torsion spring 895 is welded to the gear 3 893, and the bottom end of the torsion spring 895 is welded to the top wall of the mounting frame 82.

[0047] When the movable seat 4 is in translation, the mounting frame 82 will move synchronously, causing the gear three 893 to intermittently mesh with the tooth plate 894. When the gear three 893 is meshed with the tooth plate 894, the gear three 893 rotates. At this time, the torsion spring 895 is wound up and accumulates potential energy. When the gear three 893 is disengaged from the tooth plate 894, the torsion spring 895 releases the potential energy and causes the gear three 893 to rotate in the opposite direction. In this cycle, the gear three 893 rotates back and forth, which also causes the pulley two 892 to rotate back and forth synchronously, so that the pulley one 891 drives the rotating shaft 88 to rotate back and forth, so that the corresponding gear two 85 mechanical energy rotates back and forth, thereby causing all the gears one 83 to rotate back and forth synchronously, causing all the nozzles 84 to swing back and forth, so that the nozzles 84 can dynamically spray the shielding gas, which can greatly increase the coverage area of ​​the shielding gas, so that the welding area of ​​the metal part 10 can be completely covered by the shielding gas, thereby improving the protection effect of the welding area of ​​the metal part 10.

[0048] Furthermore, a control box 9 is fixedly connected to the outside of the mounting frame 3. The control box 9 is provided with a laser adjustment device electrically connected to the laser emitter 63. The control box 9 is also provided with a flow control device electrically connected to the shielding gas supply equipment. The flow control device can control the flow, pressure and type of gas. According to different welding requirements, the flow of shielding gases such as argon and nitrogen can be adjusted to ensure a suitable gas environment.

[0049] The control box 9 is also provided with a magnetic field regulating device electrically connected to the magnetic field generator 11. The magnetic field regulating device adjusts the strength and size of the magnetic field by adjusting the current size and current frequency in the magnetic field generator. The maximum current is 30mA and the maximum magnetic field frequency is 50Hz.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A magnetic field assisted roller laser welding device, comprising a welding platform (1), wherein the bottom of the welding platform (1) is fixedly connected to a support frame (2), characterized in that: The top of the support frame (2) is fixedly connected to a mounting frame (3), the top of the mounting frame (3) is slidably connected to a movable seat (4) that penetrates the top wall of the mounting frame (3), the top of the movable seat (4) is provided with a translation mechanism (5) for driving the movable seat (4) to reciprocate in the horizontal direction, one side of the movable seat (4) is provided with a laser welding assembly (6) for welding a metal part (10), the other side of the movable seat (4) is provided with a protective gas injection mechanism (8) for injecting protective gas onto the welding part of the metal part (10), the bottom of the movable seat (4) is provided with a rolling mechanism (7) for rolling the welding part of the metal part (10), and a magnetic field generator (11) is fixedly installed on the inner side of the welding platform (1).

2. The magnetic field assisted roller laser welding device according to claim 1, characterized in that: The translation mechanism (5) includes two fixed seats (51) arranged in parallel, the two fixed seats (51) are fixedly connected to the two ends of the top of the mounting frame (3), and a reciprocating screw rod (52) is rotatably connected between the two fixed seats (51). The reciprocating screw rod (52) passes through the movable seat (4) and is threadedly connected to the movable seat (4). A motor (53) is fixedly installed on the outer side of one of the fixed seats (51), and the output shaft of the motor (53) is fixedly connected to the reciprocating screw rod (52). A guide groove (54) that slides with the movable seat (4) is provided on the top of the mounting frame (3).

3. The magnetic field assisted roller laser welding device according to claim 2, characterized in that: The top of the movable seat (4) is fixedly connected to a guide plate (55), both ends of the guide plate (55) are rotatably connected to guide wheels (56), and the bottom ends of the two guide wheels (56) are in contact with the top wall of the mounting frame (3).

4. The magnetic field assisted roller laser welding device according to claim 1, characterized in that: The laser welding assembly (6) includes a connecting frame (61) fixedly connected to one side of the movable seat (4), one end of the connecting frame (61) is fixedly connected to a mounting seat (62), the inner side of the mounting seat (62) is rotatably connected to a laser emitter (63), the input end of the laser emitter (63) is fixedly connected to a fiber optic connector (64), the bottom end of the connecting frame (61) is hinged to a cylinder (65), and the output end of the cylinder (65) is hinged to the outer wall of the laser emitter (63).

5. The magnetic field assisted roller laser welding device according to claim 3, characterized in that: The rolling mechanism (7) includes a connecting plate (71) fixedly connected to the bottom of the movable seat (4), both ends of the connecting plate (71) are fixedly connected to electric push rods (72), the output ends of the two electric push rods (72) are fixedly connected to the same mounting seat (73), and the inner side of the mounting seat (73) is rotatably connected to a pressure roller (74).

6. The magnetic field assisted roller laser welding device according to claim 5, characterized in that: The protective gas injection mechanism (8) includes a second connecting frame (81) fixedly connected to one side of the movable seat (4), one end of the second connecting frame (81) is fixedly connected to a mounting frame (82), the bottom end of the inner side of the mounting frame (82) is rotatably connected to a plurality of nozzles (84) equidistantly distributed along the length direction of the mounting frame (82), the inlet ends of the plurality of nozzles (84) are fixedly connected to an air guide hose (86), the inlet ends of the plurality of air guide hoses (86) are fixedly connected to the same diverter pipe (87), and the inlet end of the diverter pipe (87) is externally connected to a protective gas supply device.

7. The magnetic field assisted roller laser welding device according to claim 6, characterized in that: The protective gas injection mechanism (8) also includes a plurality of gears (83) coaxially fixedly connected to the nozzle (84), a gear (85) meshing between two adjacent gears (83), the gears (85) being rotatably connected to the bottom wall of the mounting frame (82), the top of one of the gears (85) being fixedly connected to a rotating shaft (88), the top of the rotating shaft (88) being provided with a linkage (89) which drives the rotating shaft (88) to rotate back and forth by cooperating with the translation of the movable seat (4).

8. The magnetic field assisted roller laser welding device according to claim 7, characterized in that: The linkage member (89) includes a pulley 1 (891) fixedly connected to the top of the rotating shaft (88); one end of the top of the installation frame (82) is rotatably connected to a pulley 2 (892) through a pin shaft; the pulley 2 (892) and the pulley 1 (891) are connected through a belt transmission; the pulley 2 (892) is coaxially fixedly connected to a gear 3 (893); the inner wall of the installation frame (3) is fixedly connected to a plurality of tooth plates (894) equidistantly distributed along the length direction of the installation frame (3); the gear 3 (893) intermittently meshes with the tooth plate (894) by cooperating with the translation of the movable seat (4); a torsion spring (895) is sleeved on the pin shaft of the gear 3 (893); the top end of the torsion spring (895) is welded to the gear 3 (893); and the bottom end of the torsion spring (895) is welded to the top wall of the installation frame (82).

9. The magnetic field assisted roller laser welding device according to claim 8, characterized in that: A control box (9) is fixedly connected to the outside of the mounting frame (3), and the control box (9) is provided with a laser adjustment device electrically connected to the laser emitter (63). The control box (9) is also provided with a flow control device electrically connected to the protective gas supply equipment.

10. The magnetic field assisted roller laser welding device according to claim 9, characterized in that: The control box (9) is also provided with a magnetic field regulating device electrically connected to the magnetic field generator (11). The magnetic field regulating device adjusts the intensity and size of the magnetic field by adjusting the current size and current frequency in the magnetic field generator. The maximum current is 30mA and the maximum magnetic field frequency is 50Hz.

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