A composite metal containing two or three layers that have been welded together. The welding may have been accomplished by roll welding, arc welding, casting, heavy chemical deposition, or heavy electroplating.

A high performance plasma arc power source design using semiconductor switching techniques.

A test used to identify a metal. The metal is chipped off using a cold chisel and hammer. The resulting underlying pattern in the metal is unique to several classes of ferrous metals.

Chemical compound of iron and carbon, containing 93.33% iron combined with 6.67% carbon by weight; also called iron carbide. Chemical formula for cementite is Fe3C.

A chemical of carbon, hydrogen and oxygen. As used in mild steel electrode coatings, it consists of wood pulp or flour.