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Effect of Prior Machining on Residual Stress in Welds

From Lambda Technologies
 

 

Lambda Research recently completed a study of residual stress distributions developed in partial J-weld penetrations in nuclear pressure vessels. Stress corrosion cracking (SCC) field failures had occurred near similar welds. Initial phases of this work have been published. Additional testing was undertaken to provide high depth and spatial resolution of the residual stress, cold work, and yield strength distributions present on the inside surface of the Alloy 600 penetration.

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Topics of Interest
Alloy 600 penetrations in several pressurized water reactors have experienced primary water stress corrosion cracking near the partial penetration J-welds between the Alloy 600 and the cladding on the... (Read More)
Austenitic alloy weldments in nuclear systems may be subject to stress corrosion cracking (SCC) failure if the sum of residual and applied stresses exceeds a critical threshold. Residual stresses... (Read More)
Austenitic alloy weldments in nuclear reactor systems are susceptible to stress corrosion cracking (SCC) failures. SCC has been observed for decades and continues to be a primary maintenance concern... (Read More)
Alloy 600 penetrations in several pressurized water reactors have experienced primary water stress corrosion cracking near the partial penetration Jwelds between the Alloy 600 and the cladding on the... (Read More)
Residual stresses developed by prior machining and welding may either accelerate or retard stress corrosion cracking (SCC), in austenitic alloys, depending upon their magnitude and sign. A combined... (Read More)
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