Steel rail induction butt welding and heat treatment method

Abstract

The invention discloses a steel rail induction butt welding and heat treatment method which includes the following steps: locating two steel rails through locating pieces which are installed on the lower portions of center shafts of an induction welding device in a connected mode, enabling jaws of two sets of clamp forceps to clamp the two steel rails respectively and carry out centring, enabling an opening-closing type induction heating coil to be moved to the joint of the two steel rails with the help of auxiliary oil cylinders and wrap the steel rails, enabling two sub-coils to be in contact with electrode structures, enabling a PLC to control the induction heating coil to heat the joint of the steel rails, when the temperature reaches the preset welding temperature of 1200 DEG C to 1430 DEG C, enabling upsetting oil cylinders to exert preset upsetting force to enable the end faces of the two steel rails to be tightly welded together, enabling a protrusion eliminating device to cut welding beading at the joint of the steel rails, enabling the induction heating coil to heat the weld joint of the steel rails again, after the temperature reaches the preset normalizing temperature of 830 DEG C to 950 DEG C, starting an air blasting system to cool the weld joint of the steel rails, and enabling the two sub-coils to be separated through the locating oil cylinders to enable the jaws of the two sets of clamp forceps to be opened to loosen the steel rails. The steel rail induction butt welding and heat treatment method is automatic in operation and high in efficiency.

Description

technical field [0001] The invention relates to welding and heat treatment of steel rails, in particular to induction butt welding and heat treatment methods of steel rails. Background technique [0002] Induction welding is a method of heating the workpiece by using the eddy current effect on the workpiece in the alternating magnetic field-electric field induction to melt the workpiece, thereby realizing welding, which belongs to a kind of pressure welding. Induction heating can be divided into: high frequency induction heating (100 kHz~1000kHz), medium frequency induction heating (1kHz~10kHz) and power frequency induction heating (50Hz) according to the frequency of the current used. Medium frequency (1~10KHZ) heating depth is 2-10mm, generally used for heating shafts with large diameter and large and medium forging workpieces. [0003] Taking rail induction butt welding as an example, after the induction butt welding is completed, the joint structure, especially the aust...

AI Technical Summary

Problems solved by technology

[0004] In particular, the rail welding and post-weld heat treatment at the track site are carried out separately with different devices or equipment. First, the degree of automation is low and the labor intensity is high, resulting in low organizational efficiency and long construction period for rail construction. Second, welding and heat treatment are easily affected by various human factors, resulting in unstable quality of welded rail joints after welding and heat treatment; third, the cost is high and the requirements for the construction site are increased

Images