Incomplete fusion or overlap.

A low current continuous arc between the electrode and the constricting nozzle of a plasma torch that ionizes the gas and facilitates the start of the welding arc.

Slag used for cleaning or surface roughening.

An arc cutting process in which metals to be cut are melted by the heat of carbon arc and the molten metal is removed by a blast of air.

Adding a metal or alloy to another metal or alloy.

Electric current that reverses direction periodically, usually many times per second.

The deflection of an electric arc from its normal path because of magnetic forces.

The distance from the tip of the electrode or wire to the work piece.

The voltage across the welding arc.

A group of welding processes which produces coalescence of metals by heating them with an arc, with or without the application of pressure and with or without the use of filler metal.