Role of welding procedure and geometry in cracking of weld vicinities in stainless steel piping of BWRs
- BTB-Jansky GmbH, Leonberg (Germany)
A theoretical/experimental study was performed in order to record the residual weld stresses in circumferential welds on austenitic piping. The results of the study are presented in the following. With regard to the welding of circumferential welds in austenitic piping that comes into contact with reactor water, an assessment of the susceptibility to stress-corrosion cracking must address the carbon content of the pipe materials. The sensitization period of the weld vicinities and the magnitude of residual weld stresses in the region of geometrical discontinuities of the weld contour must be taken in consideration too. The sensitization period in the region of the root-side heat-affected zone (HAZ), which is a function of the number of passes and of the welding process, can be assumed as 80 sec. per pass for GTAW and 20 sec. per pass for manual-arc welding. This was established both experimentally. A parameter study performed on the FE model yielded circumferentially and longitudinally oriented residual weld stresses from 140 MPa to 220 MPa that were averaged on the inside of the pipe. The stresses were averaged over a 3-mm region adjacent to the weld flank. If the number of passes is kept as low as possible and the joins are uniformly distributed on the pipe circumference and the interpass temperature is kept at approx. 150 C, it can be expected that even V-type welds with a low sensitization period and reduced longitudinal residual stresses will be free from crack indication during the operating lifetime of BWR plants.
- OSTI ID:
- 124710
- Report Number(s):
- CONF-950740-; ISBN 0-7918-1332-0; TRN: IM9548%%300
- Resource Relation:
- Conference: Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Developments in pressure vessels and piping 1995. PVP-Volume 301; Petrinec, J.N. Jr.; Aggarwal, M.; Becht, C. IV; Bond, C.B.; Dermenjian, A.A.; Fisher, H.D.; Kobayashi, H.; Williams, D.K. [eds.]; PB: 257 p.
- Country of Publication:
- United States
- Language:
- English
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