Abstract
Shrinkage and bending deformations are difficult to be controlled for large thick plates joined by friction stir welding (FSW). In this paper, a new elastic pre-compensation method is proposed to reduce the shrinkage and bending deformations simultaneously. The analytical model of welding-induced inherent strain with elastic pre-deformations is established, by which the correlation of elastic pre-deformations and the welding inherent strain is revealed. The optimal parameters for the elastic pre-deformations are determined by using the Newton–Raphson algorithm. The experiment for AA2024-T351 thick plates is conducted, in which the welding deformations of thick plates are effectively mitigated by using the optimal elastic pre-deformations. The proposed method may be useful for the process control of FSW for large thick structures.
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