Electric heating – Metal heating – Weld rod structure
Patent
1979-07-13
1981-12-08
Kucia, Richard R.
Electric heating
Metal heating
Weld rod structure
21914621, 219121PR, B23K 3504
Patent
active
043049842
ABSTRACT:
A non-consumable electrode for plasma-arc welding in an atmosphere of carbon dioxide or carbon-dioxide-based mixtures, includes a holder of copper or copper alloys and an active insert of hafnium embedded in the holder, with a hafnium oxycarbide layer disposed on the surface of the insert, the latter also including a graphite layer applied over the hafnium oxycarbide layer. A method of manufacturing the non-consumable electrode includes the steps of joining the holder of copper or copper alloys to the active insert of hafnium, connecting the holder to the negative pole of the power supply, placing the non-consumable electrode in an atmosphere of carbon dioxide, connecting an additional electrode to the positive pole of the power supply with an electric arc struck between the electrodes, forming a hafnium oxycarbide layer on the surface of the active insert at an electric arc current of up to 0.2 I, and subsequently forming a graphite layer over the previously formed hafnium oxycarbide layer as the current is increased from 0.2 I to I at a rate not exceeding 40 amperes per second, where I is the operating current of the non-consumable electrode.
REFERENCES:
patent: 2952573 (1960-09-01), Torti
patent: 3198932 (1965-08-01), Weatherly
patent: 3597649 (1971-08-01), Byjbovsky
patent: 3639161 (1972-02-01), Trattner
patent: 3930139 (1975-12-01), Bykhovsky
patent: 4074718 (1978-02-01), Morrison
Bolotnikov Arkady L.
Bykhovsky David G.
Kiselev Viktor N.
Medvedev Alexandr Y.
Rossomakho Yakov V.
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