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

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

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.