Study of Additional Compensation Shielding Gas Technique for Pulsed MIG Seam Welding

摘要

This paper proposes a novel additional compensation shielding gas technique for seam welding as a method to overcome weld defects caused by atmospheric exposure of high-temperature solid and liquid state welding seams. This technique can be used to appropriately modify the existing pulsed MIG welding system through the addition of a gas control branch channel, allowing for control of compensation shielding gas flow to the system. A plate overlay experiment was carried out with 18-8 austenitic stainless steel base metal and a modified pulsed MIG welder with a modified a gas control branch channel. The results suggest that this technique can be used to meliorate weld defects, improve welding seam shape and enhance welding efficiency.