A double-sided symmetrical laser composite wire-filled arc welding method for medium-thick aluminum alloy

Abstract

The invention provides a medium-thickness plate aluminum alloy double-surface symmetric laser composite wire filling arc welding method. Firstly, the front surface welding is performed through annularlaser wire filling welding; the groove depth is about 2 mm; the groove angle is 30-40 degrees; the welding depth is about 5 mm; meanwhile, the back surface welding is performed through annular laser-arc composite welding; the back surface groove depth is about 3 mm; the groove angle is 45-50 degrees; the welding depth is 6 mm; and finally, the two welding depths are just fused as a seamless complete welding line. The method effectively controls a series of welding defects of easy generation of cracks and air holes and difficult formation in medium-thickness plate aluminum alloys, and meanwhile, solves the problem of insufficient laser power in medium-thickness plate aluminum alloy welding; and in addition, the overburning phenomenon of materials by gauss light spot centers is prevented through annular light spots. The welding method macroscopically improves the welding line formation, and microscopically refines microscopic structures.

Description

technical field [0001] The invention relates to the field of battery pack brackets for new energy vehicles and the technical field of material processing. Specifically, it is a double-sided symmetrical laser composite filling wire arc welding method for medium-thick aluminum alloy. Background technique [0002] Aluminum alloy has become the material of choice for the new energy automobile industry due to its high specific strength and specific stiffness, good corrosion resistance, non-magnetic properties, good electrical and thermal conductivity, and good processing and mechanical properties. With the rapid development of the modern new energy automobile industry, higher requirements are put forward for the strength and comprehensive performance of the aluminum alloy welded joints of medium and thick plates. The structural parts of new energy vehicles are mainly formed by welding, so welding performance is an important process performance index. The following major difficu...

AI Technical Summary

Problems solved by technology

At present, vacuum electron beam welding is a common welding method for medium and thick aluminum alloys. Although the welding quality is good, the welding limitations and adaptability are extremely poor, and the welding cost is high, which is unaffordable for small and medium-sized enterprises.

Images