A welding and heat treatment method for a steel rail with deep hardened layer and a steel rail

Abstract

The invention discloses a welding and heat treatment method for a steel rail with deep hardened layer and a steel rail. The method comprises: performing a flash welding on the steel rail, comprising sequentially performing an electrical heating stage and a pressure upsetting stage; wherein the electrical heating stage has a voltage of 300-385V, an average current of 500-800 A, and a duration of 80-100 s; and performing a heat treatment on the flash-welded steel rail, comprising sequentially performing a first cooling stage, a heating stage, a second cooling stage, and a third cooling stage, wherein the first cooling stage has a termination temperature of 25-100° C., the heating stage has a termination temperature of 800-1100° C., the second cooling stage has an initial temperature greater than 900° C. and a termination temperature of 600-700° C., and the third cooling stage has an initial temperature of 600-700° C. and a termination temperature of 430-500° C. The invention can improve the internal hardness of the rail head of the flash welded joint of the steel rail, thereby improving the wear resistance and service life of the welded joint of the steel rail.

Dependencies are inferred from the claim text.