The distance between the outer most portion of the torch and the work surface.

In plasma arc welding, a plasma arc established between the electrode and the work-piece.

The distance between the outer most portion of the contact tube or tip and the work surface.

The synthetic form of titanium dioxide (TiO2). In this text the terms rutile and titania have the same significance.

A joint between two members located approximately at right angles to each other in the form of a T.