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Abstract
In this paper, quantitative analyses regarding the effect of dynamic characteristics of SCR arc welding rectifiers on spatter have been made using microcomputer experimental and data analysing systems. Statistical data derived from welding tests show that there is a qualitative relationship between arc welding spatter and the dynamic criterion Ihd/Ih, i.e. the ratio of overshoot current to load current on the load/short circuit transition of welders. Further studies with high speed photography and synchronous measurement of welding current revealed that the said relationship is caused mainly by the influence of the dynamic behaviour of the rectifier on the transient current value at the moment when the short circuit transfer is over. When the value of the Ihd/Ih is over 2.0, the current output from the rectifier necessary to restrike the arc at that moment is so large that the molten pool is strongly impacted so causing spatter.