低周波パルスミグ溶接法によるAl合金溶接金属の結晶粒微細化と凝固割れ感受性の改善 : 低周波パルスミグ溶接の研究(第2報)

概要

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Vibration of molten puddle is achieved with the low frequency pulsed MIG welding process of new current waveform to switch over two preset unit pulse 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.
社団法人溶接学会の論文
1992-11-05