Method for increasing hardened layer thickness of a rail head of a flash welded joint of a steel rail and a steel rail

Abstract

A method for increasing hardened layer thickness of a rail head of a flash welded joint of a steel rail and a steel rail is provided. The method includes carrying out a flash welding on the steel rail, which includes sequentially carrying out an energization heating stage and a pressurizing and upsetting stage; wherein the energization heating stage has a voltage of 300~385V, an average current of 500~800 A, and a duration time of 80~100 s; and carrying out a heat treatment on the flash welded steel rail, which includes carrying out an accelerated cooling on a top surface of the rail head, a side surface of the rail head and a lower jaw of the rail head in a near welding seam area of the steel rail joint, the accelerated cooling has an initial temperature greater than 700° C., a final temperature of 430° C.~500° C., and an average cooling speed of 5~35° C./s.

Dependencies are inferred from the claim text.