JOINT FOR DISSIMILAR MATERIALS, STRUCTURE-SUPPORTING MEMBER, LNG CARRIER, AND METHOD FOR MANUFACTURING JOINT FOR DISSIMILAR MATERIALS

摘要

A dissimilar material joint (10), which is applied to a structure support member (5) supporting a structure (4) fabricated from a metal dissimilar to a metal of a hull (2), includes: a first joint member (11) joined to a hull-side member (6); and a second joint member (12) fillet-welded to a structure-side member (7) and friction stir welded to the first joint member (11). A first joint surface (14) of the first joint member (11) and a second joint surface (15) of the second joint member (12) are formed as substantially flat surfaces and are in surface contact with each other. The two joint members (11, 12) are joined together at a plurality of friction stir welds (21), the friction stir welds (21) being arranged in a width direction and extending in a longitudinal direction. A pair of fillet welds (23) is formed in side surfaces (20) of the structure-side member (7), the fillet welds (23) reaching a welding surface (16) opposite to the second joint surface (15). Each fillet weld (23) is disposed such that each fillet weld (23) overlaps at least one of the friction stir welds (21) when seen in a normal direction to the second joint surface (15).