电流波形对7A04铝合金脉冲TIG焊接头组织及强度的影响  

Effect of Welding Current Waveform on Microstructure and Strength of 7A04 Aluminum Alloy Pulse TIG Joint

作　　者：郭新宇 王娟[1] 孙宝壮 刘民 GUO Xinyu;WANG Juan;SUN Baozhuang;LIU Min(Key Laboratory of Liquid-solid Structure Evolution and Processing of Materials Ministry of Education,Shandong University,Ji'nan 250061,China;Shandong Special Industry Group Co.LTD,Zibo 255201,China)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061 [2]山东特种工业集团有限公司,山东淄博255201

出　　处：《热加工工艺》2022年第21期30-34,共5页Hot Working Technology

基　　金：山东省自然科学基金资助项目(ZR9MEE17)。

摘　　要：为研究电流波形对7A04铝合金脉冲TIG焊接质量的影响,采用ER5183焊丝对8 mm厚的7A04铝合金板进行脉冲TIG焊,研究矩形波、正弦波、三角波焊接电流对接头组织及强度的影响。结果表明,不同电流波形的周期性变化引起熔池搅拌效果和热输入不同,影响熔池晶粒细化程度及组织形态。采用脉冲三角波形电流焊接时,可以获得晶粒细小的焊缝组织,接头的屈服强度优于其他两种电流波形获得的接头,屈强比达0.95。ER5183 welding wire was used to weld 8 mm thick 7A04 aluminum alloy plates by pulse TIG welding to study the effect of current waveform on the welding quality. The influence of welding current form in rectangular wave,sinusoidal wave and triangular wave on the microstructure and strength of the joint was studied. The results show that the stirring effect of molten pool and heat input are different due to the periodic change of different current waveforms, therefore the grain refinement degree and the microstructure of molten pool are affected. The weld microstructure with fine grain can be obtained by using pulse triangular waveform current welding, and the yield strength of the joint is better than that of the joint obtained by the other two current waveforms, and the yield to strength ratio of the joint is up to 0.95.

关 键 词：7A04铝合金 TIG焊 电流波形 组织 

分 类 号：TG444.74[金属学及工艺—焊接]