SYMPOSIA PAPER Published: 01 January 2000

Stress-Modified Welding of Neutron Irradiated Steels


Catastrophic centerline fractures in the fusion zone have been observed in neutron irradiated steels after welding using the conventional gas tungsten arc (GTA) welding process. Specimens of type 316 stainless steel, Prime Candidate Alloy (PCA) and Sandvik HT-9 were obtained from a capsule irradiated at 200°C in the Oak Ridge Research Reactor. Severe fusion zone cracking was observed in type 316 stainless steel (up to 75 appm He) and PCA alloy (up to 86 appm He) after GTA welding. No cracking was observed in HT-9 steel with up to 2.5 appm He concentrations. The application of a compressive stress during GTA welding eliminated fusion zone cracking in both 316SS and PCA. The results indicate that the stress-modified welding technique may be used to suppress and control helium-induced cracking during repair welding of irradiated materials.

Author Information

Wang, C-A
Auburn University, Auburn, AL
Wikle, HC
Auburn University, Auburn, AL
Grossbeck, ML
Oak Ridge National Laboratory, Oak Ridge, TN
Chin, BA
Auburn University, Auburn, AL
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Developed by Committee: E10
Pages: 935–943
DOI: 10.1520/STP12442S
ISBN-EB: 978-0-8031-5419-3
ISBN-13: 978-0-8031-2852-1