RAIL BULL JOINT WELDING METHOD

摘要

FIELD: mechanical engineering; welding of rails. ^ SUBSTANCE: cross cut along vertical plane from head of rail to beginning of rail foot is made on edges of rails 1 and 2 or on edge of one of rails. Horizontal cut is made along end face surface of rails or rail square to previously made cut, and chamber at angle of 45° is made on end face surface of foot to form root face 3 at base of foot. Rails are installed at require technological clearance 4. Welding wire is fitted into clearance together with insulated end tip of electrode holder of semiautomatic welder. Electric arc welding is carried out continuously over entire height of rail with use of side forming crystallizers-straps in zone of welding out welding current providing formation of liquid bath over entire space of technological clearance. Liquid bath in root of weld is obtained owing to melting of edges of rail main metal. ^ EFFECT: improved mechanical properties of weld and increased welding rate, facilitated welding. ^ 2 dwg