对2219铝合金搅拌摩擦焊接头中出现的未焊透和孔洞缺陷进行一次、二次搅拌摩擦补焊实验。结果表明：在合适的补焊工艺参数下，可有效消除接头原有缺陷，获得成形美观，性能良好的接头；随补焊次数的增加，接头软化区域显著增加；含有上述两种缺陷接头一次补焊后拉伸性能显著提高，二次补焊接头相比于一次补焊接头拉伸性能有所降低；含有缺陷的原始接头拉伸时均于缺陷处起裂导致接头塑性较低，补焊后接头都断裂于后退侧热影响区与热机影响区交界处，呈韧性断裂模式。
The primary and secondary friction stir repair welding experiments had been untaken for the lack of penetration and cavity of 2219 aluminum alloy joints welded by friction stir welding.The results show that the original defects can be removed with proper weld-ing process parameters and thus we can achieve joints with smooth appearance and good properties.But the area of joint softened zone is increased dramatically by the increase of repair welding times.The tensile properties of primary repaired joints are satisfactory and better than that of secondary repaired for both lack of penetration and cavity defects.In the original joints,fractures all are started in the defects which led to a low ductility.However,after repair,joints fractured show a ductile fracture character at the interface of heat-affected zone and thermal-mechanical affected zone in retreating side.
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