2219/5A06异种铝合金脉冲VP-TIG焊工艺
Investigation of pulse VP-TIG welding process of 2219/5A06 dissimilar aluminum alloy
徐光霈 1魏耀光 1冉洸奇 1陈瑶 1李桓2
作者信息
- 1. 航空工业成都飞机工业(集团)有限责任公司,成都, 610073
- 2. 天津大学,天津市现代连接技术重点实验室,天津, 300072
- 折叠
摘要
为了获取最优的焊接接头性能,采用脉冲VP-TIG焊方法,对 5.5 mm厚的 2219-T87和 5A06-H112异种铝合金进行单层单道对接试验,设计了 5种工艺参数 3个因素水平的L27(39)型正交试验,同时考虑 3种因素间的交互作用,分析各因素对接头抗拉强度的影响,结果显示工艺参数对接头性能的影响从主到次依次为:焊接速度—坡口角度—峰值电流—脉冲频率—送丝速度;通过正交优化,获得了理想的无缺陷焊接接头,对优化后焊接接头的力学性能、微观组织与腐蚀性能进行试验.结果表明,接头断裂沿着 2219侧熔合线附近最大应变处发生,该位置是整个接头中硬度最低的区域,2219侧熔合线和焊缝耐蚀性最差,是点蚀优先发生的位置.
Abstract
In order to obtain the best performance of welded joints,dissimilar aluminum alloys of 2219-T87 and 5A06-H112 with a thickness of 5.5 mm was joined by pulsed VP-TIG butt welding.The L27(39)type orthogonal table with five process parameters and three levels were designed,and the in-teraction between three factors was considered at the same time.The influence of each factor on the tensile strength of the joints was analyzed,and the results show that the influence of the process parameters on the joint performance is in the order:welding speed>groove angle>peak current>pulse fre-quency>wire feeding speed.Through orthogonal optimiza-tion,an ideal defect-free welded joint was obtained.The mech-anical properties,microstructure and corrosion properties of the optimized welded joint were tested.The results show that the fracture edge of the joint was near the fusion line on the 2219 side,where the strain was the largest and the hardness was the lowest.The corrosion resistance of the 2219 side fusion line and the weld area is the worst,and it is the location where pit-ting corrosion occurs preferentially.
关键词
正交试验/脉冲VP-TIG焊/异种铝合金/力学性能/腐蚀性能Key words
orthogonal experimental/plused VP-TIG weld-ing/dissimilar aluminum alloy/mechanical property/corros-ive property引用本文复制引用
基金项目
国家自然科学基金资助项目(51675375)
出版年
2024
NETL
NSTL
万方数据