Thermite welding

From GAWDAwiki

Thermite welding is a group of welding processes in which fusion is produced by heating with superheated liquid metal and slag resulting from a chemical reaction between a metal oxide and aluminum, with or without the application of pressure. Filler metal, when used, is obtained from the liquid metal.^[1]

References

1. http://www.weldguru.com/welding-terminology.html