Method for determining and controlling the cooling rate for meta

Details Method for determining and controlling the cooling rate for meta Method for determining and controlling the cooling rate for meta

1996-02-15

1998-06-23

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219104, 219112, B23K 1102

Patent

active

057708320

ABSTRACT:
The system of the present invention includes a homopolar generator, a hydraulic uniaxial press to hold the metal alloys to be welded, and electrical connections set at selected distances from the weld interface to provide a desired cooling rate for metal alloys being welded. A method is disclosed for determining a cooling rate for a metal alloy pipe in an electrical resistance welding process in a homopolar welding system following the resistive heating of a weld interface by discharging energy from a homopolar generator through electrodes attached to each of first and second pipes to form a welded pipe segment. The temperature of the welded pipe segment is measured at periodic time intervals to determine a cooling rate for the welded pipe segment. A desired range for the cooling rate may be determined by adjusting the electrode gap for repeated samples and analyzing the resulting metallurgical properties for each sample. In a further aspect, a method is disclosed for controlling the cooling rate of metal alloy pipe by varying the electrode gap to provide a desired cooling rate following resistive heating of the weld interface and allowing the welded pipe segment to cool at the desired cooling rate.

REFERENCES:
patent: 2834871 (1958-05-01), Berg
patent: 4296305 (1981-10-01), Lifshits et al.
patent: 4656328 (1987-04-01), Weldon et al.
Grant et al., "Homopolar Pulse Resistance Welding-A New Welding Process", Welding Journal, pp. 24-36, May 1979.

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