Patent ID: 8557064
Filing Date: 2013-10-15
Classification: B23K,C21D,C22C,E01B,Y10T

Abstract:
1. A method of cooling a rail weld zone having a temperature distribution in an axial direction of a rail after welding of the rail has been completed whereby the rail weld zone comprises an Ac 1 heated region at a temperature not lower than a starting temperature Ac 1 of transformation from pearlite to austenite, and an Ac 3 heated region having a temperature not lower than a completion temperature Ac 3 of the transformation, the method comprising: cooling a rail web portion cooling region of the rail weld zone in a temperature range completing the transformation from austenite to pearlite, in a first rail web portion cooling; cooling the rail web portion cooling region in a second rail web portion cooling; cooling a foot portion of the rail weld zone in a foot portion cooling; and cooling a head portion of the rail weld zone in a head portion cooling, wherein, when a cooling time of the first and second rail web portion cooling is t minutes, a k value, obtained by dividing a width L (mm) of the rail web portion cooling region by a width LAc