The evaluation of the local residual stress after weld repair is very important for the integrity of the weld. The non-destructive evaluation technology of hysteresis is based on the fact that the hysteresis behavior of the material is very sensitive to the change of the microstructure and stress condition of the material. By measuring the hysteresis parameters of the welded structural parts, the residual stress in the weld repair area can be evaluated and classified effectively.
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