Study on microstructure evolution in welded lap joint configuration of dissimilar advanced high-strength steels using low-frequency laser wobble welding.

Laser wobble welding (oscillating laser beam) experiments were performed on high-strength micro-alloyed steels (HSLA) in both a low-carbon state (top plate) and carburized state (lower plate) using various process parameters. The welds were characterized regarding microstructure and microhardness. The cross sections of the welds had a predominantly symmetric geometry and were free of defects.

Modeling of Probeless Friction Stir Spot Welding of AA2024/AISI304 Steel Lap Joint.

In the present study, AA2024 aluminum alloy and AISI304 stainless steel were welded in a lap joint configuration by Probeless Friction Stir Spot Welding (P-FSSW) with a flat surface tool. A full factorial DOE plan was performed. The effect of the tool force (4900, 7350 N) and rotational speed (500, 1000, 1500, 2000 RPM) was analyzed regarding the microstructure and microhardness study.