New Metal Transfer Control Technology by Gas Composition Changes - Pulsed Gas MAG Welding Process -

Abstract

CO₂ gas shielded arc welding, which is widely used in the industrial world, has been recognized as an efficient and economical GMA welding process. However, it’s characteristic repelled transfer produces a large amount of spatter which results in costly cleanup and, thus, practical methods to overcome this weakness have been highly demanded. In this study, ‘Pulsed Gas MAG’ welding was proposed as a new approach to reducing spatter. The amount of spatter was reduced to the levels as low as that of the conventional MAG welding with 80%Ar + 20%CO₂ shielding gas mix and penetration profiles were round shape like those obtained in CO₂ arc welding.