Integral spring consumables for plasma arc torch using blow forw

Details Integral spring consumables for plasma arc torch using blow forw Integral spring consumables for plasma arc torch using blow forw

1996-10-08

1999-04-27

Paschall, Mark

Electric heating

Metal heating

By arc

219 75, 2191215, 21912152, B23K 1000

Patent

active

058977953

ABSTRACT:
Disclosed is a novel method and structure for contact starting a plasma arc torch. A translatable, electrically conductive component such as a nozzle or swirl ring is biased into contact with an electrode by a compliant spring element. A pilot arc is formed by first passing current through the electrode/component interface. Thereafter, the component is translated under the influence of gas pressure in a plasma chamber formed between the electrode and component, compressing the compliant element and initiating the pilot arc. The spring element may be maintained integrally with the nozzle, swirl ring, or a retaining cap, facilitating removal and replacement of the spring element with consumable components of the torch. Exemplary spring elements include wave spring washers, finger spring washers, curved spring washers, helical compression springs, flat wire compression springs, and slotted conical discs.

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