Arc Characteristics of Aluminum Alloy Double-Wire High-Frequency Pulsed GMAW

Abstract

The present study used a novel double-wire pulsed gas metal arc welding (GMAW) method, enhanced with high-frequency pulses, for welding aluminum (Al) alloy. A digital oscilloscope and high-speed photography were used to capture the voltage and current waveforms at various phases and high-frequency pulse frequencies, along with the corresponding double arc profiles. The influence mechanism of high-frequency pulse frequency on the arc average current density and arc conductivity was combined to investigate the effects of phase and high-frequency pulse frequency on arc characteristics. The experimental results revealed that arc voltage, arc power, and arc length initially decreased and then increased as the high-frequency pulse frequency rose. The phase had a significant impact on the deflection angle of the arc. The reverse phase exhibited a smaller peak deflection angle compared to the synchronous phase due to the different ratios of leading and trailing currents. However, the deflection angle of the arc remained relatively unaffected by the high-frequency pulse frequency.