Microstructure evaluation of dissimilar aa2024 and aa7050 aluminum joints made by corner stationary-shoulder friction stir welding

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SUMMARY

    Friction stir welding (FSW) typically produces lower peak HAZ temperatures and results in less HAZ softening than fusion welds, showing great promise in replacing riveting. After successful static and dynamic testing, Friction stir welds proved equal and sometimes superior to riveted joints. For the Eclipse aircraft, a total weld length of 136 m consisting of 263 separate FSW welds replaced 7378 conventional rivets. Conventional FSW was only possible inside the structure, as the rough surface brought about aerodynamic resistance (turbulences) around the weld seams, requiring surface grinding after welding. The method not only offers . . .

     

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