搅拌摩擦焊接头隧道类缺陷等强补焊工艺

针对搅拌摩擦焊接头隧道类缺陷等强补焊的应用要求,开发了基于TIG焊熔补材料、搅拌摩擦焊增强组织性能的等强补焊工艺,对补焊后的接头进行了微观组织观察与力学性能分析,评价了补焊工艺对接头性能的影响.结果表明,对焊缝同一位置进行不大于三次的重复搅拌摩擦焊,接头力学性能不会明显下降；TIG熔补焊缝经再次搅拌摩擦焊后,其焊缝组织与搅拌摩擦焊焊缝组织特征相似,不会导致接头组织恶化.采用本文开发的等强补焊工艺对某型号火箭液氧贮箱纵缝的隧道缺陷进行了等强补焊,表明该方法有效可行.

Repair Welding Technique for Tunnel Defects of FSW Joints

Arc welding and multipass friction stir welding(Multi-FSW) were applied as the repair welding technique for tunnel defects of FSW joints.Microstructures and mechanical properties of repaired joints were analyzed and the influences of the repair welding process on joint properties were evaluated.The experimental results indicate that mechanical properties of Multi-FSW joints will not decrease obviously.Compared with FSW joints,repaired joints made using TIG + FSW have similar microstructures and show no microstructural deterioration.The repair welding method is proved to be effective and feasible for the repair of the longitude welding tunnel defect of a rocket fuel tank.