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Fracture strength in 80 kg/mm² steel and mild steel joints was examined at low temperatures, using transversely-welded wide plate test specimen and small size specimen notched in heat-affected znone. 1) The fracture strength of butt joint decreases with decreasing temperature, and the relationship between logarithmic strength values andtemperature is linear.2) The local stress raisers, such as reinforcement or undercut, are necessary to lower down the strength of joint. And their equivalent crack length is about 1.6 mm. 3) Pre-loading techniqe take good effect to the strength of joint at lower temperatures, but the residual stress gives no effect to it.4) The sufficient correlation between the fracture toughness value of heat-affected zone and the fracture strength of joint was obtained.

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