OUTER-LOOP CONTROL FOR USE WITH NICKEL AND DUPLEX STAINLESS STEEL FILLER ALLOYS AND CARBON DIOXIDE CONTAINING SHIELDING GAS

摘要

A method of welding with high nickel content and duplex stainless steel electrodes using adaptive outer loop control to change at least one of a peak current or pulse frequency of a pulse waveform used for welding. The pulse waveform is changed based on a detected change in contact tip to work distance between the electrode and the work piece. The arc generated between the work piece and the electrode is shielded by a shielding gas which contains carbon dioxide and an inert gas.