Microstructures and Mechanical Properties of Welded Joints for 1.4003 Ferritic Stainless Steel and Q235-C Steel

Microstructures and properties of welded joints for 1.4003 ferritic stainless steel and Q235-C steel by MAG were investigated by neams of room-temperature tensile test,variant temperature impact test ,hardness test and metallographic analyse. The results showed that the joints had good tensile strength which was no less than base metal. The impact properties of welded joints was little under base metal. HAZ on 1.4003 ferritic stainless steel side had bad impact properties. The microstructure of the welded seam was ferritie and austenitie duplex organize. HAZ on Q235-C steel side existed obvious interface between perlite and austenitie organize.But carbon diffusion phenomenon was not evident. HAZ on 1.4003 ferritic stainless steel side had unity coarsening ferritic grain.