What is the welding method of rail butt joint?
In order to adjust the melt temperature and the chemical composition of weld metal and alloy, often adding additives amount in thermites. Thermit welding has the characteristics of simple equipment, convenient operation and no power supply. It is often used in welding of rails, bars and other large section workpieces.
When welding, advance the end to be welded two workpiece fixed in the mould, then the aluminum and iron oxide powder mixture (called thermite) is heated in a crucible, the reduction of the exothermic reaction, become liquid metal (iron) and slag (Al2O3), injection mold. The liquid metal flows into the gap of the joint to form the weld metal, and the slag floats on the surface.
Thermit welding is a method of welding with heat of chemical reaction as heat source.
