(TW)is a process that produces coalescence of metals by heating them with superheated molten metal from an aluminothermic reaction between a metal oxide and aluminum. Filler metal is obtained from the liquid metal, The process had its beginning at the end of the 19th century when Hans Goldschmidt of Gold Schmidt AG West Germany (Orgothcus Inc. USA) discovered that the exothermic reaction between aluminum powder and a metal oxide can be initiated by an external hcat source, The reaction is highly exothermic, and there- fore, once started, it is self-sustaining.