Transferred-arc plasma apparatus and process with gas heating in

Details Transferred-arc plasma apparatus and process with gas heating in Transferred-arc plasma apparatus and process with gas heating in

1987-05-15

1988-08-16

Paschall, M. H.

Electric heating

Metal heating

By arc

21912139, 21912151, 21912152, B23K 900

Patent

active

047646560

ABSTRACT:
Method and apparatus for increasing the depth of plasma flame cutting of metal via a transferred arc from a transferred-arc plasma cutting torch as created between the cathode electrode coaxial with the plasma torch primary nozzle and the metal workpiece forming the anode electrode and positioned some distance from the exit end of the plasma torch. One or more plasma torch nozzle pieces form additional nozzle lengths and are fixedly mounted to the plasma torch, are formed of metal and are electrically insulated from themselves and the metal plasma torch primary nozzle. The additional nozzles are axially aligned with the primary torch nozzle formed by the metal plasma torch body. Secondary and tertiary plasma gas flows are fed into the primary gas flow at points intermediate of the nozzle pieces tangential into radially enlarged diameter cavities formed by annular electrical insulating pieces which fixedly mount the respective nozzles pieces to each other and one of said nozzle pieces to the plasma torch main metal body forming the primary nozzle. The result is an increase in the arc voltage thereby providing a cutting jet in which gas heating is greater than the anode heating at the workpiece being cut which functions as the anode electrode for the transferred-arc plasma cutting process.

REFERENCES:
patent: 2862099 (1958-11-01), Gage
patent: 3536885 (1970-10-01), Mitchell
patent: 4125754 (1978-11-01), Wasserman et al.
patent: 4521666 (1985-06-01), Severance, Jr. et al.
patent: 4620080 (1986-10-01), Arata et al.
patent: 4639570 (1987-01-01), Zverina et al.

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