The High Frequency Induction Welding Technology of 316 Austenitic Stainless Steel with 0.3 mm Thickness

A high-speed high-frequency induction welding technology was used to weld a 316 austenitic stainless steel pipe with a wall thickness of 0.3 mm, and themacroscopic morphology, weld structure and mechanical properties of welded pipe joints under different high-frequency induction welding parameters were studied. The results show that in order to ensure the good weld formability of thin-walled 316 austenitic stainless steel under high-frequency induction welding conditions, the burrs formed on both sides of the weld must be continuous and consistent, and the heat input and extrusion must match, when the heat input increases, the amount of extrusion should decrease, and when the amount of extrusion increases, the heat input should decrease. When the welding heat input is 49.5 KJ/m and the extrusion amount is 0.36mm, the macroscopic surface of the joint is well formed and the grains in the weld zone are fine. The microstructure of the weld is dominated by austenite and δ-ferrite, and the weld hardness can reach more than 300HV, which is significantly increased compared with the base metal matrix hardness (236HV), which is the result of the refinement of weld grains. © 2021, Materials Review Magazine. All right reserved.