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论文类型：期刊论文

发表时间：2013-02-01

发表刊物：OPTICS AND LASERS IN ENGINEERING

收录刊物：SCIE、EI

卷号：51

期号：2

页面范围：96-103

ISSN号：0143-8166

关键字：Laser pulse action; Laser keyhole; Laser-arc welding; Mg atom behavior; Arc plasma

摘要：This paper presents the investigation on effect of laser pulse on the recovery delay of arc plasma during pulsed laser-arc hybrid welding of Mg alloy based on the dynamic behavior of Mg atoms. High-speed camera and spectrograph are employed to monitor the behaviors of Mg atom in the arc plasma and to characterize the effect of laser pulse on the arc plasma, respectively. It is found that the arc plasma cannot recover to its original state immediately after laser pulse action and it takes 0-5 ms for the excessive Mg atoms to escape from the arc plasma depending on the given parameters. According to the calculation, time for Mg ions to travel from the anode to the cathode in the conduction channel of the arc plasma is less than 0.1 ms. The high temperature of the laser keyhole region on the base material surface still exists when the laser pulse is removed and sustaining supply of the Mg ions from this region is the essential factor influencing recovery delay of the arc plasma. (C) 2012 Elsevier Ltd. All rights reserved.