PURPOSE: To enable a welding without developing a crack and the shortage to the reinforcement of weld, etc., by tack-welding tab steel plates along the outline of a foot part on the surface abutted on a rail at the position from a foot surface to a foot tip part near the end surface of the rail surrounded with a copper patching plate.
CONSTITUTION: The tab steel plates 5A-5D are used by machining to the shape along the outline from the foot tip parts to the foot surfaces near the end surfaces of rails 1A, 1B and tack-welding. During gas shield arc welding to the foot part of rail, a part faced to a bevel together with the rail 1A, 1B as the base material to be welded are welded to form a part of welding metal, and the reinforcement of weld is formed together with the remaining part of the tab steel plate 5A-5D. By this method, it is prevented to excessively weld the foot surface of rail by an arc during welding, and to develop the under-cut part in the foot surface of rail. Further, since the welding metal opened from the rail 1A, 1B at the foot tip part of rail is not brought into direct contact with the copper patching plate, the solidification shrinkage crack can be prevented by mitigating the rapid cooling of the welding metal.
OTOGURO MITSUAKI
OKUMURA MAKOTO
KARIMINE KENICHI
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