METHOD OF THERMAL TREATMENT OF WELDED JOINTS OF RAILS Russian patent published in 2009 - IPC E01B31/18 C21D9/04 C21D9/50 

FIELD: metallurgy.

SUBSTANCE: in method of thermal treatment of welded joints of volume tempered rails in content of travelling rail-welding machine on the way it is heated rail section in area of joint weld up to 850-900°C and forcecooled head with simultaneous cooling of neck and bottom normally on air. At thermal treatment of welded joints of rails in content of travelling rail-welding machines on the way for metal strengthening of welded joint of head of rails it is applied air flow with pressure 0.5-0.8 MPa and consumption 0.08-0.15 m3/d. Air is fed during not less than 180 s at a rate 60-200 m/s on surface of rail through row of openings of diametre 2 mm each and with total area 0.0008-0.0011 m², located in plane panel of bottom part of quench with air collector of volume 0.002-0.003 m³. Air collector is installed at a distance not more than 10 mm between surface of rail head and plane lower the panel with openings.

EFFECT: method provides required solidity of metal, persistence and wear resistance of joints of volume tempered rails, welded in content of travelling, rail-welding machines on the way.