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辛立军,林三宝,刘旭平,陈明华,伍复发.脉冲激光-电弧复合焊接镁合金过程中熔池行为与气孔产生的关系研究[J].稀有金属材料与工程(英文),2020,49(6):1894~1900.[辛立军,Lin Sanbao,Liu Xuping,Chen Minghua and Wu Fufa.Relationship between molten pool behavior and keyhole-induced porosity in pulsed laser-arc hybrid welding of magnesium alloy[J].Rare Metal Materials and Engineering,2020,49(6):1894~1900.]
Relationship between molten pool behavior and keyhole-induced porosity in pulsed laser-arc hybrid welding of magnesium alloy
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Received:February 25, 2019  Revised:April 03, 2019
DOI:
Key words: magnesium alloy, molten pool, laser-arc welding, porosity, laser keyhole
Foundation item:the National Natural Science Foundation of China (Grant Nos 51571006 and 51805236), the Natural Science Foundations of Liaoning Province (Nos. JQL201715402 and 20180510.40) and the Program for Liaoning Distinguished Professor.;哈尔滨工业大学先进焊接与连接国家重点实验室开放项目
Author NameAffiliation
辛立军,Lin Sanbao,Liu Xuping,Chen Minghua and Wu Fufa  
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Abstract:
      The porosity is an important kind of weld defects in deep-penetration laser-arc welds. This paper gives an Experimental study on relationship between molten pool behavior and keyhole-induced porosity in pulsed laser-arc hybrid welding. In this research, the impact effect of laser pulse on the weld pool, and live behavior of the laser keyhole and the porosities in the weld were investigated in detail. Results show that the impact effects from the laser pulse depend on the laser pulse parameters and stronger impact effect helps restrain the porosity formation. The laser keyhole state dominants the welding pool behavior. The keyhole dimension and open-close state directly influences the porosity formation. Extremely high laser pulse power always brings about porosities after welding. Lengthening the laser keyhole opening time and giving the gas enough time to escape will be an effectively way to restrain the porosity.