Effect of Micro Solidification Crack on Mechanical Performance of Remote Laser Welded AA6063-T6 Fillet Lap Joint in Automotive Battery Tray Construction

Remote laser welding (RLW) has shown a number of benefits joining 6xxx aluminium alloys such as high processing speed and process flexibility. However, the crack susceptibility during RLW is still an open problem. This paper experimentally assesses impact transverse micro cracks on joint strength fatigue durability in remote extruded AA6063-T6 fillet lap joints. Distribution morphology were acquired by scanning electron microscope (SEM) cross-sections. Grain weld zone was determined backscatter diffraction (EBSD) while static tensile dynamic tests carried out to evaluate mechanical performance. Results revealed that increasing from 2 m/min 6 did not introduce additional cracks. Additionally, at resulted improvement 30% compared due expansion fusion zone, measured throat thickness, refinement columnar grains near lines. Furthermore, significantly higher when fracture occurs root instead zone. can be achieved angle with optimum around 55°.