不同填充材料对含Sc和Zr铝合金TIG焊接头组织与性能的影响  

Effect on structure and Properties of Aluminium Alloy Containing Minor Scandium and Zirconium TIG Welded Joint by Using Different Filler Metals

作　　者：王少刚[1,2] 王宗祥[2] 顾冰芳[1] 

机构地区：[1]解放军理工大学工程兵工程学院,南京210007 [2]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《航空材料学报》2010年第5期30-34,共5页Journal of Aeronautical Materials

摘　　要：对采用不同填充材料获得的含Sc和Zr铝合金钨极氩弧焊(TIG)接头的组织与性能进行研究,优化了试验条件下的焊接工艺参数。拉伸试验表明,采用Al-Mg焊丝和母材焊丝焊接获得接头的抗拉强度明显高于采用Al-Si焊丝和纯Al焊丝获得接头的强度。对接头的微观组织结构分析表明,采用Al-Mg焊丝和母材焊丝获得的接头组织致密、未见有微裂纹和夹渣等缺陷,拉伸断口呈韧性断裂特征,XRD测试发现在接头中含有Al3Sc、Al3Zr和Al3Zr4等强化相,有利于提高接头的强度。The microstructure and mechanical properties of aluminium alloy containing minor scandium and zirconium joint were investigated by using different filler metals in tungsten inert gas arc welding（TIG）,and the optimized welding parameters were obtained in the experiment condition.The tensile test results show that the joint tensile strength with Al-Mg wire or base material wire is obvious higher than that of with Al-Si wire or pure Al wire.Microstructure analysis of welded joint suggests that the joint structure with Al-Mg wire or base material wire is dense and no weld defects such as micro-crack and inclusion can be found in weld metal,and the tensile fracture of joint presents the characteristics of toughness.XRD test indicates that there are some strengthening phases of Al3Sc,Al3Zr,Al3Zr4,and etc in the weld metal,which are advantageous to improve the joint strength.

关 键 词：铝合金 Sc和Zr 钨极氩弧焊 填充材料 组织与性能 

分 类 号：TG457.14[金属学及工艺—焊接]