铝锂合金自动钨极氩弧焊接工艺研究  

Process Investigation on Automatic Tungsten Inert Gas Welding of Aluminium-lithium Alloy

作　　者：李小飞[1] 李晓红[1] 熊华平[1] 李艳[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《材料工程》2008年第3期13-17,共5页Journal of Materials Engineering

摘　　要：采用自行研制的两种焊丝,进行了新型铝锂合金自动钨极氩弧焊接,测量了焊态下两种焊丝焊接接头的室温力学性能,观察了接头的显微组织和拉伸断口形貌。并采用鱼骨形抗裂实验,评定了该合金的热裂纹敏感性。实验结果表明,焊接工艺规范显著影响接头的焊缝成形,采用交流脉冲焊接方法和研制焊丝作填充材料可明显改善合金的抗裂性能,焊态下两种研制焊丝的接头强度系数均能达到60%。With two developed wires, aluminium-lithium（A1-Li） alloy was welded by Automatic Tung-sten Inert Gas Welding. The mechanical properties, microstructure of the joint and fracture morphol- ogy of tensile samples were investigated. The susceptibility to hot crack of the test alloy was also assessed through houldcroft cracking test. The experimental results show that the process specifications greatly affect the formation of weldment. Using alternating current（AC） impulse welding and with the developed wires as filler metal, the resistance to hot crack of the experimental alloy was improved significantly. The as-welded joint strength reach 60% of that of the base metal.

关 键 词：铝锂合金 自动钨极氩弧焊 显微组织 力学性能 

分 类 号：TG457.19[金属学及工艺—焊接]