5A06铝合金TIG悬空焊接参数及接头组织性能研究  

Parameters and Properties Analysis of 5A06 Aluminum Alloy without Substrate TIG Welding Joint

作　　者：姜玉恒 张海 任海玢 杨文博[1] JIANG Yuheng;ZHANG Hai;REN Haibin;YANG Wenbo(Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所,甘肃兰州730000

出　　处：《热加工工艺》2022年第9期56-59,共4页Hot Working Technology

摘　　要：采用无衬底填丝TIG悬空焊接方法进行厚度6.5 mm的5A06铝合金环缝焊接试验。通过焊接参数的优化,焊缝成型良好,并对不同焊接参数下焊接接头的金相组织、力学性能和显微硬度进行分析。结果表明,母材为原始轧制态组织,焊接接头为柱状树枝晶,枝晶间和晶界处分布着析出的β相块状沉积物,焊缝组织较为均匀。焊接接头平均屈服强度、抗拉强度及伸长率分别为151.11MPa、374.59MPa和18.28%,分别达到母材的82.3%、98.7%和63.6%。对比接头各区域金相组织、力学性能和显微硬度发现,在焊接热输入较低的位置,焊缝组织更加均匀,力学性能更好,显微硬度略高。The Girth welding experiment of 5A06 aluminum alloy with thickness of 6.5 mm was carried out by filler wire and without substrate TIG welding process. Through the optimization of welding parameters, the appearance of weld was well,meanwhile, the microstructure, mechanical properties and microhardness analysis of the welding joint under different welding parameters were analyzed. The results show that the base metal is the original rolled structure,the welding joint is the dendrite structure of the β distributed on the solid α-Al solution grain boundary. The average yield strength, tensile strength and elongation of the welding joint is 151.11MPa, 374.59 MPa, 18.28%, which is 82.3%,98.7% and 63.6% of the base metal.Compared with the microstructure, mechanical properties and microhardness of the different welding joint area, it is found that the microstructure is more uniform, the mechanical properties are better and the microhardness is slightly higher at the position with lower welding heat input.

关 键 词：铝合金厚板 填丝TIG悬空焊 金相组织 力学性能 显微硬度 

分 类 号：TG444.74[金属学及工艺—焊接]