Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第11期    总第176期    2013年11月

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文章编号:1004-0609(2013)11-3141-06
复合助焊剂对AZ31镁合金TIG焊接头组织与性能的影响
彭 建1, 2,朱 熹1,童小山1,潘复生1, 2

(1. 重庆大学 材料科学与工程学院,重庆 400044;
2. 重庆市科学技术研究院,重庆 401123
)

摘 要: 采用钨极氩弧焊(TIG)方法对AZ31镁合金进行焊接实验,研究新型复合助焊剂对AZ31镁合金焊接接头组织的性能的影响,探索优化镁合金焊接质量的方法和工艺。结果表明:实验所使用的新型助焊剂可通过“电弧收缩”和“表面张力”复合效应来优化焊接热循环;部分助焊剂以原子态进入电弧区域作用于焊接电弧,而熔入熔池的助焊剂则是通过改变熔池表面张力来加大AZ31镁合金焊接熔深,减小熔宽;助焊剂增加熔合区晶粒形核能力,细化该区晶粒,使第二相呈网状分布,提高AZ31镁合金焊接接头的综合力学性能。

 

关键词: AZ31镁合金;新型复合助焊剂;焊接接头;显微组织

Effect of compound flux on microstructure and properties of TIG welded joints of AZ31 magnesium alloy
PENG Jian1, 2, ZHU Xi1, TONG Xiao-shan1, PAN Fu-sheng1, 2

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Chongqing Academy of Science and Technology, Chongqing 401123, China

Abstract:GTAW (TIG) method was applied to the AZ31 magnesium alloy’s welding and the effects of new compound flux on the microstructure and properties of TIG welding of AZ31 magnesium alloy were investigated to develop new method and technology for promoting the quality of magnesium alloy welding. The results show that the new compound flux can optimize the welding thermal cycle through combining the arc-contraction effect and surface tension effect. Part of the flux runs into the arc region and acts on the welding arc. The melting flux into the pool increases the welding penetration of AZ31 magnesium and reduces the melting width by changing the surface tension of the molten pool significantly. The new flux increases fusion zone grain nucleation capacity, refines the grain, and makes the second phase distribute as network, which improves the mechanical properties of welded joints of AZ31 magnesium alloy.

 

Key words: AZ31 magnesium alloy; new compound flux; welded joints; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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