Abstract
The process characteristics of inverter type gas metal arc welding (GMAW) power source under static and dynamic operating conditions of welding have been studied during weld bead on plate deposition of 12 mm thick mild steel plate by using 80%Ar + 20%CO2 gas shielding. The power source characteristics considered in the present investigation is response to voltage and current variation under different modes of the power source operations as conventional GMAW, pulsed gas metal arc welding (P-GMAW), dual pulse gas metal arc welding (DP-GMAW), and modified short circuit (waveform controlled metal transfer) gas metal arc welding (MS-GMAW) processes. It is observed that in all the modes of power source operations under different conditions of welding, the increase of wire feed rate (WFR) linearly enhances the welding/mean current and arc voltage. It is further observed that using MS-GMAW process provides better weld quality with respect to less spatter generation than those of the GMAW, P-GMAW, and DP-GMAW processes.
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