新一代运载火箭2219铝合金配用焊丝研制

针对新一代运载火箭贮箱材料2219铝合金，研制出了适用于常、低温贮箱焊接的焊丝。综合评价结果表明，新研制的焊丝具有良好的制造工艺性能、成分稳定；焊接2219铝合金裂纹敏感性低、气孔敏感性低、焊接工艺性好，接头性能满足指标要求，焊缝组织正常，补焊性能良好，拉伸、冲击均呈韧性断裂特征；接头综合性能优于2A14／BJ-380接头。

Welding Wire Matched 2219 Aluminum Alloy in New Generation Launch Vehicle

The welding wire used in welding lanch tank of normal temperatures and low temperatures are manufactured considering 2219 aluminum alloy which will be used in new generation launch vehicle. The integrated results show that the new welding wire has well manufactured properties and components are stability. The weldability of 2219 aluminum alloys which have low crack sensitivity, low air hole sensitivity, are fairly good, and the properties of welded joints which have normal microstructures and good properties of renewed welding can satisfy employed request. The integrated properties of welded joints are more excellent than welded joints of 2A14/BJ -380.