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激光电弧复合焊接AZ31B镁合金

Hybrid Laser-Arc Welding of AZ31B Mg Alloy

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摘要

采用激光束与电弧复合焊接AZ31B镁合金,研究了这种复合热源对焊接熔深、表面成型的影响,探索了激光-电弧不同复合方式对焊接过程中电弧稳定性的影响。结果表明,激光束与焊接电弧共同组成的复合热源在正向焊接镁合金时形成的焊接熔深,比单独采用钨极氩弧焊(TIG)焊接增加了1倍左右,同时复合热源焊接电弧稳定性也较钨极氩弧焊接提高了1倍以上,是一种理想的镁合金焊接方法;而当激光-电弧复合热源反向焊接时,电弧稳定性较正向焊接进一步增大。对复合热源的电弧稳定性和激光吸引电弧的现象以及熔深增加的机理进行了讨论。

Abstract

Hybrid laser-arc welding was used to join AZ31B Mg alloy. Weld penetration, surface formation were researched, and effect of arc stability was investigated in positive and negative welding directions during hybrid welding. The results showed that the weld penetration was increased by more than about one times and the weld stability increased by more than one times, compared the positive direction hybrid welding with gas tungsten arc welding only. It has been proved that the welding for magnesium is a perfect process. For negative direction hybrid welding, welding stable was further improved, but weld penetration was not increased. In addition, arc stability in hybrid welding and arc root location were discussed.

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中图分类号:TG 456.7

所属栏目:激光制造

基金项目:国家863计划(2002AA331160)和教育部优秀青年教师资助计划资助项目。

收稿日期:2003-08-04

修改稿日期:2003-08-04

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作者单位    点击查看

刘黎明:大连理工大学材料工程系, 辽宁 大连 116024
王继锋:大连理工大学材料工程系, 辽宁 大连 116024
宋刚:大连理工大学材料工程系, 辽宁 大连 116024

联系人作者:刘黎明(liulm@dlut.edu.cn)

备注:刘黎明(1967―),男,大连理工大学材料工程系工学博士、教授,主要从事新材料焊接工艺及焊接过程数值模拟等方面的研究。

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