Comparative Residual Stress Analysis in Welded Joints Using Both Experimental and Numerical Techniques

摘要

During cooling of the welds, the outer weld generally shrinks and the inner weld expands due to the differential cooling of outer and inner weld geometries. Due to this, tensile stresses can be observed in the inner weld and compressive stresses can be observed on the outer weld which forms the residual stress formation in the joints. Life and the load carrying capacity of the structures are very much influenced by the extent of residual stress in the joints. Estimation of this stress helps in estimating the safety of the structure subjected to various types of loads. Especially the tensile stresses are the possible causes of reduction in strength as well as for fatigue fracture failures. X-ray diffraction technique (XRD), a non-destructive testing method, is used to find the residual stress in the present problem and the same problem is validated through finite element analysis. Comparison shows matching results between experimental and finite element analysis. The work is to show the efficiency of Finite element analysis as good alternative to the experimental techniques which are costly and need precise, costly equipment along with longer time for testing. XRD pattern was also represented to find the peaks in the XRD measurement.