PROCESS PARAMETERS AND THE STRUCTURE OF MAG PULSED DUPLEX STAINLESS STEEL WELDED JOINTS

The paper sets out a synergic program by MAG pulsed welding of Duplex stainless steel plates with thickness of 12 mm. The selected filler material was a E2209-16 wire with a diameter of 1.2 mm and as shielding gas Cronigon 2 was used. The root layer was obtained at lower linear energy, of 6.9 kJ/cm, and for the filling layers the heat input was different namely: 10 kJ/cm, 15 kJ/cm and 20.7 kJ/cm. Macro-and micrographic analysis showed that variation of linear energy for obtaining the filling layers, by reducing the welding speed or increasing the welding current, permitted the obtaining of welded joints without continuous metallic defects and of a free defects surface such as marginal notches.