In thermit welding, a refractory mould is placed around the two square cut rail ends. The gap between the rail ends is about 15mm. The rail is preheated to a temperature dependant on the chemical composition of the rail and the precise welding process. A crucible containing a combustible powder, iron and alloying elements is placed above the mould, the powder is ignited and when it attains the correct temperatures, it melts a plug and flows into the mould. The cooling and post weld heat treatment of the rail are chosen dependant on the rail material and the application.
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在热熔焊接中,一个耐火模具被放置在两个方形切割轨道的两端。轨端间距约为15mm。钢轨的预热温度取决于钢轨的化学成分和精确的焊接工艺。一个含有可燃粉末,铁和合金元素的坩埚被放置在模具上方,粉末被点燃,当它达到正确的温度时,它融化一个塞子并流入模具。钢轨的冷却和焊后热处理的选择取决于钢轨材料和应用。