2219铝合金双丝焊热影响区组织及力学性能

Microstructure and mechanical properties of 2219 Al-alloy heat-affected zone with twin wire welding

摘要: 采用焊接热模拟试验方法研究了2219铝合金双丝焊热影响区的微观结构和力学性能的变化规律。结果表明,2219铝合金双丝焊软化区温度区间为400~500℃,450℃时软化最为严重。正常冷速时热影响区最低强度仅为母材的60%。慢的冷却速度更加损害热影响区性能,因此可考虑增大冷速方法强化热影响区。峰值温度对断裂类型影响不大,合金断裂均属于韧性断裂。

Abstract: Microstructure and mechanical properties changing rules of 2219 Al-alloy HAZ(heat-affected zone) with twin wire welding were studied using welding thermal simulation method.The result shows that the temperature interval of soften zone is 400-500℃ for 2219 Al-alloy twin wire welding,and 450℃ is the most serious temperature.The minimum strength is only 60% of the base metal with normal cooling rate.And property of HAZ is damaged more seriously with slower cooling rate,so increasing cooling rate can be used to strengthening HAZ.Effect of peak temperature on fracture type is small,and the alloy fractures are all ductile rupture.