Thermite welding is all about using thermite for welding steel or iron. Thermite is actually a mixture of iron oxide and powdered aluminum.

Copper thermite is a type of thermite where instead of the iron oxide, copper oxide is used instead. The reaction produces pure copper metal, but this thermite gets a little more splattery than the iron thermite.

Thermite is manufactured from pure metals and avoiding the use of carbon in the process of it. Thermite was originally discovered by a German chemist named Hans Goldschmidt.

Thermite is not illegal in (most) countries, as long as you keep yourself and everyone else safe from it.

Thermite reaction is used in industry for welding steel together in-place