研究論文
ITER TF コイル容器用溶接継手の極低温機械特性評価
2019 年 54 巻 6 号 p. 467-476
詳細
2019 年 54 巻 6 号 p. 467-476
Full austenitic stainless filler metal, FMYJJ1(12Cr-14Ni-10Mn-5Mo-0.13N), for Tungsten Inert Gas (TIG) welding has been developed to realize high strength and toughness at the temperature of liquid helium, and is to be applied for manufacturing the toroidal field coil case (TFCC) of the ITER. Before applying this filler metal in the actual production of a TFCC, 30 weld joints were trial-manufactured in order to confirm welding quality, including weldability, metallurgical properties, and mechanical properties at room temperature and liquid helium temperature. This paper provides a summary of weld joint mechanical properties, such as tensile strength, fracture toughness, fatigue crack growth and fatigue properties, which were obtained in the qualification phase at the temperature of liquid helium. In addition, in order to clarify correlations between welding control parameters and mechanical properties, the results of comparisons with other parameters are provided.
The views and opinions expressed herein do not necessarily reflect those of the ITER Organization.
