Abstract
Vibration of molten puddle is achieved with the low frequency pulsed MIG welding process of new current waveform to switch over two preset unit nulse conditions alternately.The degree of this vibration depended on switching frequency of unit pulse conditions, fs and there was an optimum frequency range of fs=10-30 Hz, and moreover large difference between two pulse current values promoted the molten puddle vibration.It was made clear that the stirring effect of molten puddle was expected by this process and this resulted in the remarkable grain refinement of weld structure of commercial avairable Al-Mg alloy base metal and wire within the optimum frequency range, especially fs=30 Hz.Moreover, this process.had a beneficial effect to improve the solidification crack susceptibility of Al-Mg alloy weld metal due to the grain refinement.
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