Method of and apparatus for hard facing poppet valves

Details Method of and apparatus for hard facing poppet valves Method of and apparatus for hard facing poppet valves

1975-01-27

1977-04-19

Truhe, J. V.

Electric heating

Metal heating

For deposition welding

219123, B23K 904, B23K 908

Patent

active

040190110

ABSTRACT:
A method and apparatus is described for coating or hard facing the working surface of a poppet valve, in which a uniformly distributed coating is obtained without dilution of the deposited metal, and without requiring preheating of the valve or its working surface. A non-consumable electrode and a consumable electrode or rod are held in position above the working surface of the valve, and an arc is struck between the tungsten electrode and the end of the rod, while avoiding contact of the arc with the working surface. As the rod is consumed by the arc, the valve is rotated about its axis and the drops of molten metal are uniformly distributed on the working surface, by the use of a magnetic field for controlling such distribution.A heat sink is used to dissipate any build up of heat in the area of the deposit.

REFERENCES:
patent: 2826671 (1958-03-01), Gayley
patent: 2920183 (1960-01-01), Greene
patent: 2982845 (1961-05-01), Yenni et al.
patent: 2998922 (1961-09-01), Gibson
patent: 3028479 (1962-04-01), Tauschek
patent: 3433924 (1969-03-01), Sevenco
patent: 3743815 (1973-07-01), Woods
patent: 3825712 (1974-07-01), Gibbs

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