Abstract
To enhance the strength of the skin-stringer structures for aircraft, comparative tests between single-pass and double-pass welding by friction stir welding (FSW) were implemented. 1.8mm 2524-T3 aluminum alloy was used as the skin and 2.4mm 7150-T77511 aluminum alloy was used as the stringer with equilateral right-angle structure, and perfect joints without internal defects were obtained. Moreover, the tensile, peel and metallographic tests were implemented, and the results show that the average peel strength of double-pass FSW is 2 times or more than single-pass FSW. Therefore double-pass FSW can effectively improve the connection strength of aircraft skin and stringers structure.
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