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Indexed by:期刊论文

Date of Publication:2009-11-01

Journal:IEEE TRANSACTIONS ON PLASMA SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:37

Issue:11

Page Number:2197-2201

ISSN No.:0093-3813

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

Abstract: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.