Patent ID: 11866801
Assignee: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for making a welded joint for a rail, comprising the following steps:
Step 1): subjecting a rail web area of the welded joint which is obtained by flash butt welding to a cooling by means of an accelerated cooling device and by using compressed air as a cooling medium, measuring and monitoring temperature of a central position of the rail web area at a weld of the welded joint while cooling;
Step 2): stopping the cooling when the temperature of the central position of the rail web area of the welded joint drops to a preset temperature, then placing the welded joint in air and naturally cooling to room temperature;
wherein the rail is a pearlite rail having a carbon content of 0.6-0.9 wt %;
wherein a cooling rate at the central position of the rail web area of the welded joint during the cooling process in step 1) is larger than 18° C./s;
wherein the preset temperature in step 2) is within a range of 800-1,100° C.