Steel rail thermit welding method

The invention provides a steel rail thermit welding method which comprises the following steps: S1, adjusting the ends of two steel rails to be welded, and aligning the ends; s2, the welding end is subjected to sand mold clamping; s3, a crucible is installed on the sand mold, welding flux is placed in the crucible, and the sand mold is preheated; s4, after reaction is conducted for preset time, the sand mold is dismantled, and standing cooling is conducted on the welding position; s5, the welding position cooled in the step S4 is subjected to overlap pushing operation; s6, polishing operation is conducted on the welding conducting position; and S7, the welding quality is detected. According to the exothermic welding method for the steel rail, on the premise of conforming to related specifications, construction can be rapidly carried out, in a low-temperature environment, the steel rail is preheated, ultrasonic flaw detection is carried out on the welding heads, the welding quality is ensured, and it is guaran