Investigating the effect of heat input on mechanical properties and microstructural in dissimilar joint between A283 Gr C steel and 304L stainless steel in SMAW welding methods

In this research, the effect of heat input on the microstructure and mechanical properties of 304L stainless steel connection to A283 grade C plain carbon steel has been investigated by shielded metal arc welding method. E-309L electrode was used for this purpose. In order to investigate the microstructure and mechanical properties of the weld metal, heat affected zone and the base metal, macrographic, metallographic, microhardness and uniaxial tensile tests were performed. The results showed that due tothe increase in heat input, the depth and penetration of the weld metal is less affected and in the first place the width of the welding line increases. The tensile test obtained from the samples showed that with increasing the heat input, the final strength and ductility of the samples decreased due to grain growth in the areas around the weld metal. Also, with increasing the heat input, the hardness of the weld metal area and the hardness of the heat affected area decreased due to grain growth and the formation of delta ferrite phase in the area affected by the heat of the base metal 304L. In contrast, as the heat input decreased, black holes were observed in the junction of the base metal side of the A283 base, which were caused by a lack of melting and reduced heat.

کلیدواژه ها:

Heat Input ، Mechanical Properties ، DissimilarWelding Joint ، Stainless steel