Solution to problems of arc interruption and stable arc length control in tandem pulsed GMA welding. Study of arc stability in tandem pulsed GMA welding (Report 2)

摘要

In this study, the prevention of arc interruption and control methods for the arc length stabilisation during tandem pulsed GMA welding were investigated. The results may be summarised as follows: 1 When the value of the base current in the trailing arc is increased, the frequency of the occurrence of abnormal arc voltage rises and arc interruptions decrease, and these problems can be avoided with the value of the base current set to 120 A. However, with the set base current value at 120 A, 1 pulse 1 globule transfer synchronised with the pulse becomes difficult and this becomes a primary factor for the occurrence of spatter. 2 In-phase pulse timing control, where pulse peak current flows simultaneously to the leading and trailing wires, had the effect of reducing the occurrence of abnormal arc voltage rise and arc interruption; however, these could not be prevented entirely for the trailing arc.