Abstract
The stress distributions in a thick welded specimen with a partial repair weld were measured with the three-cut contour method. The longitudinal stress maps in the original weld and the repair weld were obtained and the transverse stress map at the weld centerline in the original weld was acquired. The difference between the longitudinal stress in the partial repair weld and that in the original weld was investigated. Results show that the longitudinal stress increases significantly within the entire repair region with a peak tensile longitudinal stress close to the yield strength of weld material; and the longitudinal stress in the region above the repair weld decreases distinctly after repair; the introduction of the partial repair weld does not affect the stress distribution trend in the original weld (whether it is beyond or above the repair weld), and it has a slight effect on the tensile stress distribution width in the repair region.
Highlights
Welding residual stresses, developed due to localized heating and non-uniform cooling accompanied with steep thermal gradients that arise in the weld zone, have been known as one of the most critical factors in weldments
An automated were measured by the X-ray diffraction (XRD) to method the measured results by the method
Should be affected the repair weld should be plane the as-welded longitudinal the by thebylongitudinal stressand on itthe first cut measured by the CMstress
Summary
Welding residual stresses, developed due to localized heating and non-uniform cooling accompanied with steep thermal gradients that arise in the weld zone, have been known as one of the most critical factors in weldments. The detrimental effects of welding residual stresses on the structural integrity, fatigue performance, service security, and remaining life of the welded structures are significant [1]. Repair welds can influence the magnitude and distribution of the as-welded residual stresses in the weldments. The stress distribution and variation in repair welds have attracted much attention during recent decades. Dong et al [2,3] found that the weld repairs typically increase the magnitude of transverse residual stresses along the repair compared with the original weld and that the shorter the repair length the greater the increase in the transverse stress. Song and Dong [4] suggested that a weld repair should be designed as long as possible, as narrow as possible, and as shallow as possible
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