To provide a method of manufacturing a long welded rail which is improved in fatigue strength at a weld zone compared with a conventional long welded rail.
According to the method of manufacturing the long welded rail, at least two rails are flush-butt-welded or gas-pressure-welded together, and the most portion of a bead formed at the weld zone is punched by a cutting tool having a shape following an external periphery of the rail, followed by carrying out ultrasonic peening on a toe of weld of the bead, located at least on a downstream side in a punching direction. Thus a fatigue limit that is obtained after repeated loading of two million times, is improved by 30 MPa compared with a product on which the ultrasonic peening is not carried out.
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UEDA MASAHARU
| JPS59106603A | 1984-06-20 | |||
| JPS63101086A | 1988-05-06 | |||
| JP2008544861A | 2008-12-11 | |||
| JP2005118871A | 2005-05-12 | |||
| JP2002180201A | 2002-06-26 |
Masaaki Utsunomiya
Atsushi Watanabe
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