| Summary: | Dynamic variations in distribution of arc light radiation in micro-plasma arc welding with pulsed current (P-MPAW) are complicated, especially, those abnormal variations influenced by high frequency. It can be seen in the study that there are three areas with obvious difference in arc light radiation during micro-plasma arc welding (MPAW). The variations of light radiations and dimensions in arc three areas mainly followed the transient changes in value of pulsed current when frequency was low. However, with an increasing in frequency of pulsed current, these regular dynamic variations following pulsed current were disturbed by high frequency effects, for instance, dynamic inertia effect, high frequency steady effect, and high frequency compression. In addition, resonation phenomenon occurred at some frequency, leading to a large value either in arc light radiation or in arc dimension. Moreover, the transient variations in arc light radiation and arc dimensions were not synchrotrons because of their different dynamic inertia effect. Keywords: P-MPAW, Dynamic variations, Arc light radiation, Dynamic inertia effect, High frequency steady effect, High frequency compression
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