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论文类型：期刊论文

发表时间：2009-11-01

发表刊物：IEEE TRANSACTIONS ON PLASMA SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：37

期号：11

页面范围：2197-2201

ISSN号：0093-3813

关键字：Concentrate; electric conducting route; laser keyhole; low-power laser/arc hybrid welding; negative wave of ac arc

摘要：Low-power laser/arc hybrid welding process of magnesium alloy shows that the weld capability of tungsten-inert-gas arc is improved under the action of laser pulses. The effect of laser pulse on arc plasma is analyzed by studying the plasma spectra, plasma shapes, and arc voltage in this paper. On the one hand, laser pulse attracts arc plasma to laser keyhole and improves the stability of arc plasma; on the other hand, laser pulse expands the arc plasma and concentrates the electric conducting route of arc plasma. All these increase the output power and energy density of arc plasma, so the welding penetration is improved. In addition, laser pulses are controlled to act on the negative wave of alternating-current arc (the target metal has negative polarity) in hybrid welding process to improve the stability of arc plasma and weld penetration.