The Effects of Welding Speed on Microstructure and Mechanical Properties of Dissimilar Welded Joints by CO2 Laser Welding

This study investigated the effects of welding speed on microstructure and mechanical properties of dissimilar welded joints (AISI 430 ferritic stainless steel and AISI 1010 low-carbon steel) by using CO2 laser beam welding. Laser beam welding (LBW) experiments were carried out under argon and helium shielding gas atmosphere at 2500 W constant heat input and 100-200-300 cm/min welding speeds. The microstructures of the welded joints were examined by optical microscopy, SEM, EDS, and X-ray analysis. The tensile strength of the welded joints was measured. The results of this study demonstrated that the best properties were observed at the specimens welded at a welding speed of 100 cm/min.