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Method for increasing hardened layer thickness of a rail head of a flash welded joint of a steel rail and a steel rail
Abstract The present invention discloses a method for increasing hardened layer thickness of a rail head of a flash welded joint of a steel rail and a steel rail. The method comprises 5 following steps: 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 500~800A, and a duration time of 80~100s; and carrying out a heat treatment on the flash welded steel rail, which includes carrying out an 10 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 7000 C, a final temperature of 430°C~500C, and an average cooling speed of 5~35°C/s. The present invention can improve the hardened layer thickness of the rail head of the flash welded joint of the 15 steel rail, thereby improving a wear resistance and service life of a steel rail welding joint. [Fig 1]
Method for increasing hardened layer thickness of a rail head of a flash welded joint of a steel rail and a steel rail
Abstract The present invention discloses a method for increasing hardened layer thickness of a rail head of a flash welded joint of a steel rail and a steel rail. The method comprises 5 following steps: 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 500~800A, and a duration time of 80~100s; and carrying out a heat treatment on the flash welded steel rail, which includes carrying out an 10 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 7000 C, a final temperature of 430°C~500C, and an average cooling speed of 5~35°C/s. The present invention can improve the hardened layer thickness of the rail head of the flash welded joint of the 15 steel rail, thereby improving a wear resistance and service life of a steel rail welding joint. [Fig 1]
Method for increasing hardened layer thickness of a rail head of a flash welded joint of a steel rail and a steel rail
2025-03-27
Patent
Electronic Resource
English
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