| Abstrakt: |
The design features of the portable module for heat treatment of welded joints of railway rails produced by the method of flash butt welding are considered. The process of heat treatment includes an induction heating of welded joints with the currents of 2.4 kHz frequency and a subsequent hardening of the rolling surface of the head by a compressed air. The design of the portable module includes inductors connected directly to matching transformers. The inductor wires repeat the shape of the rail surface bend with increased air gaps above the web and feathers and contain magnetic conductors located above the rolling surface, side surfaces of the head, web and the flange of the rail. It was shown that in welded butts of R65 type rails made of K76F steel after heat treatment on a portable module in the zone of hardening cooling of the head, a uniform fine-grained structure with a hardness is formed, reaching the level of hardness of the base metal. The hardness of the metal in the deep layers of the rail head increases also relative to the hardness of the base metal at the appropriate depth. 10 Ref., 2 Tabl., 5 Fig. [ABSTRACT FROM AUTHOR] |
