US PATENT SUBCLASS 219 / 121.57
.~.~.~.~ Arc ignition

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
121.11  DF  .~ By arc {16}
121.36  DF  .~.~ Using plasma {8}
121.54  DF  .~.~.~ Control systems {3}
121.57.~.~.~.~ Arc ignition

DEFINITION

Classification: 219/121.57

Arc ignition:

(under subclass 121.54) Subject matter including means for starting an arc.

(1) Note. Between a starter nonconsumable electrode and the workpiece.

(2) Note. Between a consumable electrode and the workpiece.

(3) Note. Between the nonconsumable electrode of the torch and the torch structure.

(4) Note. Arc ignition includes interalia straight and reverse polarity and the control of power to the electrode.