What is rail thermit welding?
The so-called thermit welding, the two rails are connected by method of aluminium heat welding, thus forming a seamless rail, improve the safety of the train, the passengers didn't hear the click, click the train rail joint sound.
Thermit welding is a kind of thermit welding, and it is the most common welding of rails. Aluminium heat welding between the parts to be welded to set aside a certain gap around the mold wall, then ignited in the crucible of flux through a redox reaction, exothermic formation of liquid metal, the liquid metal into the gap between welding pieces, metal welding.Thermit welding process are: rail end preparation - sand mold preparation, pre heating and welding package preparation - casting, sand mold and push the tumor to remove grinding.
The liquid metal flows into the gap of the joint to form the weld metal, and the slag floats on the surface. 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.
Thermit welding, thermit, welding, welding method using chemical reaction heat as heat source. 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.
