A substance which can?t be broken down into two other substances. Everything on Earth is a combination of such elements, of which there are only 103.

A welding process producing coalescence of metals with molten slag which melts the filler metal and the surfaces of the work to be welded. The molten weld pool is shielded by the slag, which moves along the full cross section of the joint as welding progresses.

A welding process producing coalescence of metals with molten slag which melts the filler metal and the surfaces of the work to be welded. The molten weld pool is shielded by the slag, which moves along the full cross section of the joint as welding progresses.

Negatively charged particles that revolve around the positively charged nucleus in an atom.

A device used for mechanically holding and conducting current to an electrode during welding or cutting.