Thermal and strain history measurements on 304L pipe girth welds
- and others
Nuclear reactor piping systems fabricated from AlSl Types 304 and 316 stainless steels are susceptible to intergranular stress corrosion cracking (IGSCC). Investigations of this cracking phenomenon clearly show that weld tensile residual stresses present on the inner surface of a pipe weldment are key contributors to the problem. Thus one method for reduction and/or prevention of IGSCC is to control weld residual stresses, requiring studies such as present herein. In this study, thermal and strain histories were recorded by a computer data acquisition system for three 40-cm-diameter (16 in.), Type 304L stainless steel (SS), schedule 40 (1 .27 cm thickness) pipe girth welds. This research yielded a large number of experimental data including thermal cycles, transient strains, radial and axial deformation developed during welding. Initial analysis of experimental data indicates that the experimental system was able to monitor the thermomechanical history developed in the vicinity of the weld. The conclusions of this study are (1) the experimental approach of this research is effective in demonstrating the development of thermal and strain history in pipe girth welding; (2) the residual stress distribution is not axisymmetric in multipass pipe girth weldments; (3) the narrow gap groove weldment has lower residual stress level as compared to standard V-groove weldments; and (4) this study provides the experimental database and a guideline for further computational modeling work.
- OSTI ID:
- 115525
- Report Number(s):
- CONF-9404233--
- Country of Publication:
- United States
- Language:
- English
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