Post-welding heat treating properties of 316L stainless steel and 600 nickel base alloy dissimilar weldment by GTAW

This study employed the inert gas tungsten arc welding technique to perform dissimilar joining of Inconel 600 nickel-based alloy and 316L stainless steel. The welding configuration adopted for the specimens was a butt joint. Additionally, the completed weldments underwent separate heat treatment processes: 24 hours of aging treatment at 700°C and 30 minutes of solution treatment at 1100°C. The experimental results revealed that after the inert gas tungsten arc welding, the hardness of welding zone, tensile strength, and elongation all exhibited a decrease, with the tensile fracture point located in the fusion zone of the weld. Following the 700°C aging treatment for 24 hours, there was an observable trend of improvement in the hardness of welding zone, tensile strength, and elongation. Upon undergoing the 1100°C solution treatment for 30 minutes, the elongation of weldments notably increased, while a decrease was observed in both yield strength and hardness.