Electric heating – Metal heating – By arc
Patent
1991-09-18
1992-12-08
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912148, 21912157, B23K 910
Patent
active
051700301
ABSTRACT:
A plasma arc torch having new electronic circuit concepts wherein main current regulated power means regulates the pilot current prior to main arc transfer. Further, the circuit may contain two inductors to which DC current initially flows but is interrupted upon main arc transfer such that one inductor maintains the pilot arc while the current in the second inductor forces the establishment of the transferred arc. Also, advantages are presented in pulsing the cutting arc as well as pulsing the pilot arc.
REFERENCES:
patent: 4280042 (1981-07-01), Berger et al.
patent: 4324971 (1982-04-01), Frappier
patent: 4598191 (1986-07-01), Marhic et al.
patent: 4839499 (1989-06-01), Kotecki et al.
patent: 4943699 (1990-07-01), Thommes
patent: 5036176 (1991-07-01), Yamaguchi et al.
Solley Dennis J.
Tatham David A.
Denk Paul M.
Paschall Mark H.
Thermal Dynamics Corporation
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