Electric heating – Metal heating – By arc
Patent
1990-03-02
1991-05-21
Paschall, M. H.
Electric heating
Metal heating
By arc
21912154, 21912155, 21912144, B23K 900
Patent
active
050177524
ABSTRACT:
A process for starting a plasma arc torch is disclosed which minimizes the oxidation of the electrode to thereby extend the life of the electrode. A flow of non-oxidizing gas is first generated between the discharge end of the torch electrode and the nozzle assembly of the torch. A pilot arc then is created between the discharge end of the electrode and the nozzle assembly. The pilot arc is transferred and the flow of non-oxidizing gas is terminated. A flow of oxidizing gas then is generated for plasma formation.
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Severance, Jr. Wayne S.
Turner Tommie Z.
ESAB Welding Products, Inc.
Paschall M. H.
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