2005 Swagelok Company, all rights reserved
September 2005
A-1
Appendix A
Glossary
Arc
The flow of electrical current between an anode and
cathode. In welding, the flow of current between an
electrode and the work.
Arc Gap
The distance between the electrode and the work.
Arc Gap Gage
The gage used to set the arc gap in the weld head rotor.
Arc Radiant Energy
The ultra-violet light emitted from the welding arc.
Arc Start
The period of the welding cycle following prepurge. During
this short period of time, approximately 0.01 second, high
voltage is applied between the electrode and workpiece,
initiating the arc. The only control of this period is with arc
start power, Code 23 in program mode.
Arc Welding
A type of welding process that uses an electrical arc as a
source of heat to melt and join metals.