外加轴向磁场对短路过渡的影响

为提高短路过渡频率、减少焊接飞溅,分别通过施加直流与交变轴向磁场,研究了轴向磁场对短路过渡的影响规律,分析了高速摄像、电流电压信号以及熔滴在磁场作用下的短路过渡受力情况.结果表明:当直流磁场励磁电流为4 A时,短路过渡频率达到最大值;当交流磁场励磁电流为9 A、磁场频率为100 Hz时,短路过渡频率达到最大值,这与电流-电压波形波动频率基本一致,并且施加适当的磁场能够有效促进液桥缩颈并断开,提高短路过渡频率、减少飞溅.

Influence of external axial magnetic field on metal argon arc welding short circuit transition

In order to increase the short-circuit transfer frequency and reduce the welding spatter, the influence of axial magnetic field on short-circuit transfer was investigated by applying DC and alternating axial magnetic field respectively. The high-speed camera, current and voltage signals and the short-circuit transfer force of droplets under the action of magnetic field were analyzed as well. All results show that the short circuit transition frequency reaches the maximum when the DC magnetic field excitation current takes 4 A. When the AC magnetic field excitation current becomes 9A and the magnetic field frequency reaches 100 Hz, the short circuit transition frequency reaches the maximum, which is basically consistent with the fluctuation frequency of the current-voltage waveform. Appropriate application of magnetic field parameters can effectively promote the necking and disconnection of the liquid bridge, increase the short circuit transition frequency and reduce the spatter.