Method for preheating rails before butt-welding, e.g. using thermite process, comprises heating foot of rail to higher temperature than head, but below critical value

摘要

The method for preheating rails (8) before butt-welding, e.g. using the thermite process, comprises heating the foot (36) of the rail to a higher temperature than the head (34), but below a critical value. An Independent claim is included for a system for carrying out the process comprising burners (141, 142) directed towards the feet of the rails which are mounted in tubes (19, 20) in the temporary mold (9) used during welding.