Last pass heat sink welding process development. Final report
One of the principal factors responsible for intergranular stress corrosion cracking (IGSCC) in the heat affected zone of girth welds in Type 304 stainless steel in BWR piping is the presence of unfavorable tensile residual stresses. Heat sink welding had been identified in prior projects as a mitigating remedy for these unfavorable residual stresses. This research project had the objective of developing field procedures capable of producing compressive ID residual stresses in girth welded pipe for all position welding using last pass heat sink welding (LPHSW) techniques. The results indicated that while compressive residual stress could be routinely obtained for smaller diameter pipe, it was difficult to obtain compressive ID residual stresses for large diameter pipe, especially in the 2G welding position using the welding parameters developed in this project.
- Research Organization:
- Boston Edison Co., MA (USA)
- OSTI ID:
- 5350331
- Report Number(s):
- EPRI-NP-3414; ON: DE84920276
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
BWR TYPE REACTORS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
FABRICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INTERGRANULAR CORROSION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
MATERIALS
NICKEL ALLOYS
PIPES
REACTORS
RELAXATION
RESIDUAL STRESSES
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRESS CORROSION
STRESS RELAXATION
STRESSES
WATER COOLED REACTORS
WATER MODERATED REACTORS
WELDED JOINTS
WELDING