Corrosion Resistance of Fe-Based Stainless Steel Composite Layer Prepared by TWIAW

In this study, Fe-based stainless steel composite layer was prepared by Twin-Wire Indirect Arc Welding (TWIAW). Weld penetration increased with the increasing of the welding current and the amount of CO2 in Ar+CO2 protective gas. However, the CO2 content exceeded 20% led to serious welding spatters. The phase of the surfacing layer was austenite plus ferrite. As no sensitization or slight sensitization occurred, the composite layers show better intergranular corrosion resistance, which can be attributed to the low heat input in TWIAW. The pitting corrosion resistance depends on the point defects formed on the surface of the layers, which is relevant to the stability of the process and the oxidation of the protective gas.