In oder to investigate the effects of prefabricated groove length(Lc)and remanufacturing path on thermal cycle curve,cooling rate and peak residual stress of molten pool,based on the thermal elastoplastic theory and finite element method,a thermo mechanical coupled finite element model of 17-4PH plate remanufacturing was established using Simufact welding software,and the distribution of temperature field and residual stress of the remanufacturing parts are analyzed.The results show that the variation trend of remanufacturing temperature cycle curve is the same between the same path and the cross path.In addition to the prefabricated groove length of 12W,the cooling rate gradually increases with the increase of the number of welds.The peak value of the residual stress in the cross path is slightly less than that in the same path,and the value of the residual stress in the vertical weld direction is less than that along the weld direction.The maximum value of the residual tensile stress along the weld direction is in the arc extinguishing end of the last weld and the adjacent base metal area,and the peak value of the residual stress in the vertical weld direction occurs in the middle of the first weld and the adjacent base metal area.In order to avoid high residual tensile stress,the length of the prefabricated groove should not be less than 16W,and the residual stress of the prefabricated groove when the length of the prefabricated groove is 4W is greater than that of other prefabricated groove lengths.Therefore,the length of the prefabricated slot should not be too short during remanufacturing.The research results provide reference for the design of prefabricated groove,the optimization of remanufacturing path and the regulation of residual stress of 17-4PH parts.
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