This work aimed to determine the feasibility of dissimilar weld joints between high-manganese austenitic stainless-steel pipes of grades 201LN and 214 using the autogenous gas tungsten arc welding (GTAW) process. Three different welding speeds, designated as 1.5, 2.5, and 3.5 mm/sec, were used, and the weld joints produced were subjected to analysis of weld bead shape integrity, microstructure in solidification mode and delta-ferrite content, mechanical properties, and pitting corrosion resistance. The dissimilar weld joints were confirmed to be free of defects upon completion. As welding speed increased, the weld bead size decreased, delta-ferrite content decreased, micro-hardness increased, and ultimate tensile strength increased, whereas percentage elongation decreased. The pitting corrosion resistance increased to levels higher than those of both base metals. It was concluded that increasing the welding speed enhanced productivity and could potentially resolve issues encountered in the seafood production industry. • This study investigates the use of high manganese stainless steel (series 200: low cost materials) as a substitute for high nickel austenitic stainless steel (series 300: high cost materials) in the seafood processing industry, focusing on dissimilar welding. • Stainless steel grade high manganese stainless steel (series 200) is low-cost and widely used in Southeast Asian countries. • The research findings are expected to be highly beneficial to manufacturing and assembly industries in developing countries. • This research also supports the application of low-cost Group series 200 stainless steel in other regions interested in reducing material costs.
Chuaiphan et al. (Fri,) studied this question.