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水素侵入による980MPa級溶接金属の低温割れ限界条件

Critical condition for hydrogen induced cold cracking of 980 MPa class weld metal

石川 信行*; 末吉 仁*; 鈴木 裕士; 秋田 貢一

Ishikawa, Nobuyuki*; Sueyoshi, Hitoshi*; Suzuki, Hiroshi; Akita, Koichi

水素をチャージしたY溝高速溶接継ぎ手試験片を用いて低温割れ試験を行い、低温割れ限界条件を検討した。中性子回折法を用いて溶接部内部の残留応力分布測定を行った。ルート部では、き裂開口方向に1100MPa以上の高い引張残留応力が発生していることを確認した。

Cold cracking test was conducted using Y-grooved constraint weld joint by intentionally introducing hydrogen gas, and critical hydrogen content in the weld metal to cold cracking was determined. Residual stress distribution in the weld meal was measured by neutron diffraction technique. The root portion showed highest tensile stress of over 1110 MPa in the transverse direction, which is the same as the crack opening direction.

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