Improved Mechanical Properties of SUS304/AA5083 Dissimilar Joint by Laser Ablation Pretreatment in Vortex- Friction Stir Lap Welding

To obtain a high-quality Al/steel dissimilar joint, micro-groove-assisted vortex-friction stir lap welding (MG-VFSLW) process was developed. Through prefabricating micro-grooves on the steel plate surface by laser ablation, mechanical interlock and metallurgical bonding were obtained simultaneously in MG-VFSLW process. The weld formation, interface microstructure, properties, failure mode studied comparing them with those VFSLW. results showed that line load of AA5083/SUS304 joint up to 485.9 N/mm MG-VFSLW, which is 40.1% higher than Remarkable intermetallic compound layers cracks found closely related oxides interface. However, cross-riveting aluminum rivets formed due flashes made ablation. Good also between AA5083 SUS304. No remarkable occurred. During tensile shear tests, cut off some dimples tear ridges existed fracture surface. In short, high strength attributed bonding.