AN APPARATUS AND A PROCESS FOR ALTERNATING SUPPLY OF TWO SHIELDING GASES TO A GAS METAL ARC WELDING (GMAW) TORCH AT A PRE-SET ALTERNATING/ PULSING FREQUENCY

摘要

Accordingly, there is provided an apparatus and process for alternate supply of shielding gas to the GMAW torch. The proposed method delivers two different shielding gases alternatively to the GMAW torch directly without any pre-mixing. The pulsing frequency is adjustable from 20 to 120 cycles/min. The welding parameters and the alternate shielding gas supply frequency for improved weld quality is also established.