INFLUENCES OF THE HEAT INPUT ON A 2205 DUPLEX STAINLESS STEEL WELD

摘要

In arc welding, the energy is transferred from the electrode to the base metal via an electric arc. The energy transferred per unit length is measured as the heat input. The heat input is an important factor that influences the cooling rate and affects the metallurgical and mechanical properties of welds. In this study, the flux-cored arc-welding process was used to join duplex stainless steel. The experiment was conducted on the basis of a three-factor, five-level central composite rotatable design using the full-replication technique. A mathematical model was developed for the heat input. The effects of the welding-process parameters on the heat input are discussed. Metallographic techniques were employed to study the microstructure produced at low, medium, high and optimum heat-input conditions.