College of Aerospace Engineering;
Shenyang Aerospace University;
Shenyang;
110136;
China;
Guangdong Key Laboratory of Enterprise Advanced Welding Technology for Ships;
CSSC Huangpu Wenchong Shipbuilding Company Limited;
Guangzhou;
510715;
China;
Non-keyhole friction stir welding; Welding tool simplification; Microstructures; Material flow; Mechanical properties;