Verification of prediction method of plastic collapse stress for pipe with weld overlay

Weld Overlays (WOL) have been widely used in many countries as effective methods to repair pipes with stress corrosion cracks in nuclear power plants. Authors have developed the theoretical equations to estimate plastic collapse bending moments for weld overlaid pipes with circumferential part-through cracks, based on net-section stress approach. The objective of this paper is to compare the calculated stresses with experimental data of full-scale WOL pipe specimens. The procedures of JSME fitness-for-service code were employed for the calculations of Z factor and flow stress. From the comparison of experimental data, it is demonstrated that the methods are applicable to the flaw assessment for the JSME fitness-for-service code.