溶接熱サイクル再現試験による溶接継手部の破壊靭性評価に関する一考察

概要

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To develop a simplified method for evaluating the welded joint fracture toughness, the authors subjected test pieces taken from 50kgf/mm^2 high tensile (HT50) steel plate and 9% Ni steel plate to the synthetic weld thermal cycle and then to V-notch Charpy impact test for determination of their fracture toughness from the Charpy test results, with the following conclusion. (1) The fusion line fracture toughness (K_c) of welded joints in HT50 steel plate can be estimated from 50% brittle fracture appearance transition temperature (_vT_<rs>) determined by V-notch Charpy impact test of the steel plate test pieces which were exposed to the same weld thermal cycle as the actual welded joint fusion line on the synthetic weld thermal cycle test apparatus. (2) The fusion line fracture toughness (K_c) of welded joints produced in 9% Ni steel plate using 70% Ni-family welding material can be estimated from V-notch Charpy absorbed energy (_vE) determined for the 9% Ni steel plate test pieces which were subjected to the same weld thermal cycle as the actual welded joint fusion line on the synthetic weld thermal cycle test apparatus.
社団法人日本船舶海洋工学会の論文
1989-08-25