Concerning root crack belonging to hydrogen induced cold cracking, many researches have been done from mechanical and metallurgical points of view. Concept of restraint intensity is proposed to indicate quantitatively the conditions for prevention of root crack in Japan. Restraint intensity is related with average net stress and strain in weld metal, but it is not related with local stress and strain at the root of weld. According to researches in fracture mechanics field, crack initiation is considered to be a function of local stress or strain at a point where cracking is expected. Local stress at the root of weld will be one of useful informations for studying on root crack.
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