WELDING STRUCTURE WITH EXCELLENT RESISTANCE TO BRITTLE CRACK PROPAGATION

摘要

A welded structure wherein steel plates having at least partial regions with a brittle crack arrest property Kca of 4000N/mm 1.5 or more are butt welded together so as to form a steel plate welded joint, wherein at least one location of the steel plate welded joint is provided with a crack control part which diverts a brittle crack which has occurred at the steel plate welded joint to a steel plate base metal side, outer edges of an insert member which forms the crack control part are formed to extend in the longitudinal direction of the steel plate welded joint from a weld metal zone of the steel plate welded joint while slanted by 15° to 50° with respect to the longitudinal direction of the steel plate welded joint, and a horizontal width direction end of the insert member is made to face a region of the steel plate where the Kca is 4000N/mm 1.5 or more, whereby even if a brittle crack occurs in the welded joint, the brittle crack can be kept from propagating through the weld joint and base metal.