Method and apparatus for welding

Details Method and apparatus for welding Method and apparatus for welding

1994-04-04

1996-07-30

Walberg, Teresa J.

Electric heating

Metal heating

For bonding with pressure

219 8624, 219 912, 219 93, B23K 1111, B23K 1114

Patent

active

055413846

ABSTRACT:
A method of joining a ball member to an end of a cylindrical matrix plunger body by resistance welding thereby to make a plunger for use in a directional control valve for controlling fluid communication in said valve is disclosed. A resistance welder for the method has a pair of electrodes. The ball member is placed in contact with a conical recess within the matrix plunger body and with a conforming surface of one of said electrodes so as to form a circular first contact between the ball member and the matrix plunger body and a spherical second contact between the ball member and the one electrode such that electrical contact resistance at the first contact is greater than that at the second contact. Then, an electric current at a constant rate flows for a controlled period of time through the first and second contacts with the ball member which is kept in contact with the matrix plunger body under pressure by the electrode. When the electric current passes through the electrodes, the greatest resistance and hence the greatest heating effect takes place at the first contact, where a solid-phase joint is formed.

REFERENCES:
patent: 3952395 (1976-04-01), Crossman et al.
patent: 4752026 (1988-06-01), Van De Griend
patent: 5113054 (1992-05-01), Hund et al.

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