Effects of weld reinforcement on tensile behavior and mechanical properties of 2219-T87 aluminum alloy TIG welded joints  

焊缝余高对2219-T87铝合金TIG焊接头拉伸行为及力学性能的影响（英文）

作　　者：王国庆[1] 李权[2] 李艳军[3,4] 吴爱萍[3,4] 麻宁绪 鄢东洋[1] 吴会强[1] 

机构地区：[1]中国运载火箭技术研究院,北京100076 [2]首都航天机械公司,北京100076 [3]清华大学机械工程系,北京100084 [4]清华大学先进成形制造教育部重点实验室,北京100084 [5]Joining and Welding Research Institute,Osaka University,Osaka,Ibaraki 567-0047,Japan

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第1期10-16,共7页中国有色金属学报（英文版）

摘　　要：Tungsten inert gas （TIG） welded joints for 2219-T87 aluminum alloy are often used in the fuel tanks of large launch vehicles. Because of the massive loads these vehicles carry, dealing with weld reinforcement on TIG joints represents an important issue in their manufacturing and strength evaluation. Experimental and numerical simulation methods were used to investigate the effects of weld toe shape and weld toe position on the tensile behavior and mechanical properties of these joints. The simulation results indicated that the relative difference in elongation could be as large as 96.9% caused by the difference in weld toe shape. The joints with weld toes located in the weld metal or in the partially melted zone （PMZ） exhibited larger elongation than joints with weld toes located at the juncture of the weld metal and the PMZ.运载火箭燃料贮箱通常采用2219-T87铝合金钨极氩弧焊(TIG)生产。由于贮箱服役时的承载环境比较严苛,TIG焊接头的余高控制是贮箱生产及其性能评价中的重要问题。采用实验和数值模拟的方法研究焊趾形状和焊趾位置对接头拉伸行为及力学性能的影响。研究结果表明,焊趾形状对接头的伸长率影响显著,数值计算的结果中伸长率最低值与最高值相差达96.9%;启裂侧焊趾处于焊缝和部分熔化区时接头伸长率高于焊趾处于焊缝与部分熔化区交界处的。

关 键 词：tensile strength weld reinforcement 2219-T87 aluminum alloy TIG welding digital image correlation （DIC） technique 

分 类 号：TG457.14[金属学及工艺—焊接]