Electric heating – Metal heating – By arc
Patent
1987-02-13
1988-08-30
Paschall, M. H.
Electric heating
Metal heating
By arc
2191304, 219 75, 21912154, 21912157, B23K 900
Patent
active
047679085
ABSTRACT:
The invention relates to a torch for plasma arc welding and cutting operations carried out on metal, which comprises a hollow grip, to which two power supply conductors are connected together with tubes supplying plasma-forming gas and coolant, a cylindrical electrode rigidly attached to the forward end of the grip and wired to the negative pole of the power supply, and a tapered nozzle positioned forward of the electrode and fitted to a metal sleeve which is wired to the positive pole of the power supply, ensheathed by insulating material, and capable of sliding in relation to the electrode. Plasma-forming gas is injected into a space between the electrode and the sleeve, channelled through to a constricting chamber accommodating the tip of the electrode, and ionized by an arc struck between the electrode and the nozzle before being projected from the orifice in the nozzle.
REFERENCES:
patent: 3558973 (1971-01-01), Pochert et al.
patent: 4567346 (1986-01-01), Marhic
patent: 4580032 (1986-04-01), Carkhuff
patent: 4598191 (1986-07-01), Marhic et al.
patent: 4663512 (1987-05-01), Kneeland et al.
Ansaloni Raffaele
Dallavalle Silvano
Cebora S.p.A.
Paschall M. H.
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