| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermit welding method for rails by which the fatigue performance of a welded joint part is improved even when using a bisecting type casting mold which is high in execution efficiency. SOLUTION: This method is provided with a stage for welding the rails by a thermit welding method and a stage for thinning or removing casting fins 11 which are formed in the surface part 3B of the rail foot in the welded part between the rails. In a stage for welding the rails, the bisect type casting mold may be used. The stage for thinning or removing the casting fins 11 may be performed while the rails are cooled to room temperature after a stage for welding the rails, or may be performed after the rails are cooled to the room temperature. In this way, the fatigue strength in the welded part by the three-point bending is made to be≥250 MPa at the number of cycles of two millions. COPYRIGHT: (C)2008,JPO&INPIT |
