通过单道与双道焊搭接接头试样疲劳试验,对铝合金6061-T6搅拌摩擦焊搭接焊缝缺陷和疲劳性能进行了比较分析.结果表明:搅拌摩擦焊搭接接头连接界面处总存在钩状缺陷,对搭接接头疲劳性能产生严重影响,其疲劳强度不高于母材抗拉强度的5.6％.单道焊试样疲劳性能优于双道焊试样,单道焊和双道焊试样疲劳强度特征值△σk(应力比R=0.1)分别为17.45MPa和13.91MPa,双道焊工艺不能改善钩状缺陷分布特征.单道焊搭接接头疲劳断口为多重起裂,且裂纹源均位于上板底部钩状缺陷处,疲劳裂纹扩展区表现为穿晶断裂特征,具有典型的疲劳条带且存在二次裂纹;双道焊试样起裂位置和二次裂纹数量均比单道焊多,且起裂位置有沿晶断裂特征,是降低其疲劳性能的主要原因.
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