... ,never loosen 3.supplier of vietnam railway &india railway 1.Exothermic welding powder ISO9001:20082.no split/holes,never loosen3.supplier of vietnam ... complete welding. Exothermic welding is also called as fireclay fusion joining, fireclay fusion welding, exothermic fusion welding, exothermic welding, chemical heat fusion welding, etc.Chemical reaction rate for exothermic welding is ...