Lap welding refers to welding one board on the other. Welding structure that is not on a plane after laser pointer welding. This type of method is more commonly used in the welding of automobile body-in-white. Due to the high reflectivity of the aluminum alloy to the laser and the high thermal conductivity of the material, the single-beam laser cannot achieve self-melting lap welds. If the high-power laser wire welding is used, there are also defects: part of the laser energy is used to melt the welding wire to form a weld, and the other part is used to melt the base material. The laser energy absorbed when the molten pool formed by the melting wire fluctuates also With this change, at this time, part of the laser energy of the molten wire will suddenly enter the weld base material, causing excessive energy to form a through-type air hole, which becomes a weld defect. The laser pointer plasma composite welding process is used to weld the lap welds of aluminum alloy thin plates. The plasma arc energy can effectively melt the metal at the corners of the lap welds and spread to form a continuous lap weld. The welding seam has a certain penetration depth in the lower plate, forming a reliable connection effect.
Green laser pointer plasma composite lap self-fusion welding can replace the existing resistance spot welding and glue coating traditional body manufacturing process, the strength of the weld is greater than that of the optical fiber brazing weld, its weld connection width and surface over-molding effect meet automotive vehicles Body manufacturing requirements, continuous welds can improve the overall strength and rigidity of the whole car body, improve the sealing effect of the car body, and improve the anti-fatigue ability and anti-vibration ability of the car body. Stack welding (seam welding) is to overlap two boards together, and there can be a close gap between the two boards. When welding, only one side is welded, so that the molten pool penetrates the upper plate and melts a part of the lower plate. Connect the two pieces to be welded. This technology can replace a part of the lap weld, and can also firmly connect the ribs in a small space.