对比分析了搅拌摩擦和氩弧焊两种工艺方法对铝合金焊接接头疲劳性能的影响，建立了焊接接头的S-N曲线，结果表明：在相同的载荷条件下，搅拌磨擦焊接接头的疲劳性能优于氩弧焊接头。搅拌摩擦焊接头疲劳寿命N=106次的疲劳强度值约为59~65MPa之间。对焊接接头显微组织的分析表明：搅拌摩擦焊接接头具有比氩弧焊接头更为细小的晶粒和狭窄的焊接热影响区，阻碍了滑移带的形成和裂纹的扩展，从而提高了接头的疲劳性能。TIG焊接接头疲劳端口分析显示，焊接缺陷是主要的疲劳裂纹源。
The effect of welding processes friction stir welds (FSW) and (TIG) on fatigue properties of LF2 aluminum welded joints were analyzed and the S-N curve of the welded joints were established. The results show that the fatigue properties of FSW welded joints are better than that of TIG welded joints. Fatigue strength of friction stir welds is determined as 59~65MPa under N=106. Microstructures of joints are comparatively fine grain and narrow HAZ zone in the FSW welds which inhibit the growth of crack and produce high fatigue life compared to that of the TIG welds. Fracture morphologies of TIG welds show that the fatigue fracture occurs from weld defects.
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