Abstract:Residual stress distributions in partial repair welds exhibit 3-D characteristics. It is necessary to perform measurement on internal stresses to investigate the effects of partial repair on welding residual stresses. The internal stress distributions in a 50 mm -thick specimen with a partial repair weld are measured by the contour method with multiple cuts, and the longitudinal and transverse stress distributions in the initial weld, the longitudinal stress distribution in the repair

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... eld are obtained. The effect of the partial repair weld on the welding longitudinal stress distribution is studied. The extent of stress release induced by the transeverse cut at the middle-length location is also investigated. Investigated results show that the full maps of the welding longitudinal and transverse stress distributions can be obtained by the multiple-cut contour method; the peak longitudinal stress within the repair weld increases by 30% as compared with that in the initial weld; due to the heat effect exerted by the multipass welding of the repair weld, the peak longitudinal stress in the region above the partial repair weld decreases by 60% in relation to the peak stress in the initial weld; the * 国家重点研发计划(2018YFC0310400)、国家自然科学基金(51575251)和 江苏省研究生科研与实践创新计划(KYCX18_2319)资助项目。20181112 收到初稿,20190613 收到修改稿