Abstract
Summary Vibration of the weldpool is achieved in the low‐ frequency pulsed MIG welding process using a new current waveform for alternate switching of two unit pulse conditions. This paper describes an investigation of the beneficial effect of reducing blowholes, which often cause problems during MIG welding of A1 and its alloys, using the above process in 99.9%Ar‐0.1%H2 shielding gas. A switching frequency of the unit pulse conditions in the fs = 10–25 Hz range is shown to have a beneficial effect of reducing blowholes in various wire‐parent metal combinations, at various welding speeds, and in flat, vertical‐up, and horizontal positions. This process is also effective in reducing blowholes in Al cast alloys.
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