Aluminothermic welding of railway rails - by spraying coolant onto rails immediately after welding

摘要

In the aluminothermic welding of treated rails or rails made in special steels, the novelty is that, after casting the aluminothermic mixt., a fluid coolant is projected onto the side- and running-surfaces of the rails as near as possible to the welded joint line. The coolant is pref. sprayed water or a mixt. of water with air and the pref. device consists of a sand mould held round the butt joint by stirrup clamps which are subsequently removed and replaced by the coolant spraying devices; the latter pref. consisting of shaped boxes contg. spraying nozzles and an insulating wall to protect the mould. Used for welding railway rails including those made in steel with a high manganese content. Process restricts the flow of heat into rails which have been heat-treated.