Abstract

At different levels of mean current (150, 180 and 210A) the effect of pulse frequency, varied from 0 to 100 Hz, on the extent to recrystallization at heat affected zone (HAZ) and the microstructure and porosity content of weld deposit are investigated, during pulsed metal inert gas (MIG) welding of an Al-Zn-Mg alloy. The observations of pulsed current welding are compared with those found in conventional continuous current welding process

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