2219铝合金对接+搭接接头TIG焊接工艺研究  

Study on Welding Process of 2219 Aluminum Alloy butt+Overlap Joints

作　　者：唐瑜 杨康 林鹏 倪龙 李兴 廖东俊 曾文昆 李乔 TANG Yu;YANG Kang;LIN Peng;NI Long;LI Xing;LIAO Dongjun;ZENG Wenkun;LI Qiao(Sichuan Aerospace Changzheng Equipment Manufacturing,Chengdu 610100,China)

机构地区：[1]四川航天长征装备制造有限公司,四川成都610100

出　　处：《电焊机》2022年第1期89-94,共6页Electric Welding Machine

摘　　要：以5 mm+7 mm厚2219铝合金板材为研究对象,研究了装配间隙、焊接速度、焊接电流对5 mm+7 mm对接+搭接板焊接接头组织和性能的影响。针对2219铝合金的焊接特性设计了三种不同的工艺参数,采用TIG焊对5 mm+7 mm对接+搭接2219铝合金板进行焊接,并对焊接接头进行了组织和力学性能分析。结果表明:三种参数下的对接+搭接接头均成形良好,背面焊漏光滑且均匀,焊缝表面均不存在咬边、急剧过渡、飞溅类缺陷;小间隙、大电流的焊接参数下的接头性能更好,抗拉强度能够达到母材的72%,合适的焊接速度和电流可以抑制第二相的析出和聚集,从而使熔合线处组织更加均匀,提高接头的力学性能。对相关材料的焊接具有一定的参考价值。In this paper,the effects of assembly gap,welding speed and welding current on the structure and performance of butt joint+lap joint are studied by taking 2219 aluminum alloy plate with 5 mm+7 mm thickness as the object.The 5 mm+7 mm butt+overlap joints of 2219 is welded by TIG as different process parameters according to the welding characteristics of 2219 aluminum alloy,and the structure analysis and mechanical properties test of the joints are carried out.The results show that,the butt and lap joints under the three parameters are all well formed,the back welding leakage is smooth and uniform,and there is no undercut,sharp transition and spatter defects on the surface of the weld,the joints welded by smaller gap and larger current have better performance,and tensile strength can reach 72%of the base material.Suitable welding speed and current can inhibit the precipitation of the second term,thereby making the structure at the fusion line more uniform and improving the mechanical properties of the joint.It has certain reference value for welding process of the 2219 aluminum.

关 键 词：2219铝合金 对接+搭接接头 焊接工艺 装配间隙 焊接电流 

分 类 号：TG457.14[金属学及工艺—焊接]