Device for welding battery tray through robot CMT and FSW technologies

Abstract

The invention discloses a device and method for welding a battery tray through robot CMT and FSW technologies. The device comprises a workpiece conveying and carrying system, a CMT robot welding system, an FSW robot welding system and a safety protection device, wherein the workpiece conveying and carrying system comprises a conveying chain, a carrying robot and a carrying robot control cabinet; the CMT robot welding system comprises a CMT welding robot, a CMT welding robot control cabinet, a CMT welding assembly, a five-axis double-station rotation positioner and a CMT station tool clamp; and the FSW robot welding system comprises an FSW welding robot, an FSW welding robot control cabinet, an FSW welding assembly, a double-station rotation positioner and an FSW station tool clamp. A CMT and FSW combined process is provided, so that weld joints of the battery trays are completely welded thoroughly, the air tightness is improved, deformation control meets product requirements, and devices such as the robot CMT, the robot FSW, the carrying robot and the conveying chain are used for cooperatively and efficiently producing the battery trays.

Description

technical field [0001] The invention relates to the technical field of production of new energy vehicle auxiliary devices, in particular to a device and method for welding battery trays using robot CMT and FSW technologies. Background technique [0002] CMT is cold metal transition welding technology (Cold Metal Transfer). When the short-circuit current is generated, the welding wire is stopped and retracted automatically, and the voltage and current are reduced at the same time, so as to achieve spatter-free transition and reduce heat input; FSW is Friction Stir Welding (Friction Stir Welding) is a method that uses the heat generated by the friction between the high-speed rotating stirring head and the workpiece to melt the weldment material to complete the welding; when CMT is welding aluminum alloy, it can clean the oxide film, reduce heat input, and reduce deformation , improve the welding quality; and FSW welding aluminum alloy in addition to small deformation, high wel...

AI Technical Summary

Problems solved by technology

[0003] The manufacture of aluminum alloy battery trays is an important means for new energy vehicles to achieve lightweight, and battery trays have high requirements for performance, requiring small deformation, good air tightness and high welding quality in manufacturing, but the traditional use of MIG welding for batteries The pallet is welded, which is prone to defects such as cracks and pores, and is prone to large deformation after welding, resulting in poor sealing of the product and difficulty in assembly.

[0004] In today's aluminum alloy welding process, MIG welding has high production efficiency, good weld shape, and small spatter, but high heat input and large deformation; TIG welding has stable arc, easy control of heat input, and no spatter, but low production efficiency and deep penetration Small; CMT welding technology has the advantages of small deformation, small heat input and good welding quality. However, most of the battery trays are fillet welds. Focus on the quality of the weld seam, and the deformation problem during the welding process does not meet the performance requirements of the battery tray product; and FSW cannot handle the fillet weld welding, and it needs to install the back when welding the unequal thickness butt weld seam between the frame of the battery tray and the bottom plate support

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