2219厚板铝合金钨极和熔化极惰性气体保护焊焊接接头组织与性能对比  

Comparison of Microstructure and Properties of Welded Joints in Tungsten&Metal Inert Gas Welding of 2219 Thick Plate Aluminum Alloy

作　　者：丁吉坤 宋建岭 蒙丹阳 高泽峰 王亚森 DING Jikun;SONG Jianling;MENG Danyang;GAO Zefeng;WANG Yasen(Tianjin Long March Launch Vehicle Manufacturing Co.Ltd,Tianjin 300462)

机构地区：[1]天津航天长征火箭制造有限公司,天津300462

出　　处：《宇航材料工艺》2020年第5期93-97,共5页Aerospace Materials & Technology

摘　　要：对15 mm厚2219-C10S铝合金分别进行钨极惰性气体保护焊(TIG)、熔化极惰性气体保护焊(MIG)对接试验,对接头焊缝成形、内部质量、组织形貌及力学拉伸性能进行对比分析。结果表明,TIG焊缝表面光洁,鱼鳞纹美观,焊缝内部近无缺陷;MIG焊缝飞溅较多,焊缝表面较为粗糙,焊缝内部存在少数单个小气孔。TIG焊缝晶粒尺寸较为细小,分布均匀;MIG焊盖面的焊缝组织晶粒则比较粗大,分布不均,热影响区比TIG焊接头的晶粒更为粗大。两种接头的熔合区组织不均匀,晶粒大小不一。常温拉伸试验中,两种接头均沿熔合区断裂,TIG焊接头强度和塑性要优于MIG接头。The tungsten inert gas(TIG)and metal inert gas(MIG)welding tests were carried out on the 15mmthick 2219 aluminum plates.The shape,internal quality,microstructure and tensile properties of the joints were compared and analyzed.The results show that the surface of TIG weld is bright and clean while the MIG welds are rough.There are a few tiny pores in MIG weld while the inside of the TIG weld is very clean.The grain size in weld seam of TIG joint is finer and more uniformly distributed than that of MIG joints.The grain size in heat affected zone(HAZ)of MIG joints is coarser than that of TIG joints.The grain size in fusion zone of both joints is quite uneven.Two kinds of joints cracked along the fusion zone in the tensile test at room temperature.The strength and plasticity of TIG joint is better than that of MIG joint.

关 键 词：2219铝合金 焊缝成形 组织形貌 力学拉伸性能 

分 类 号：TG442[金属学及工艺—焊接]