Electric heating – Metal heating – By arc
Patent
1981-03-16
1985-04-23
Albritton, C. L.
Electric heating
Metal heating
By arc
219158, 219161, B23K 1500
Patent
active
045131945
ABSTRACT:
Disclosed is a method of welding a diaphragm to the housing sections of a diaphragm-controlled device. The diaphragm and housings are first clamped together to provide a component of force perpendicular to the areas or seat of the housing which hold the diaphragm. An electron beam directed at, above, and below the sandwich edge of the housing and diaphragm causes a weld to be formed in a portion of the seat. The clamping pressure and expansion of the liquified metal forces part of the metal out of the sandwiched area such that, upon cooling, the housings are brought together against the diaphragm in a secure and pressure-tight weld. In order to weld in a vacuum chamber, it is necessary to remove the gases in the chamber. Diaphragm devices are characterized by the housing having a cavity therein and the diaphragm dividing the cavity into two chambers. Gas evacuation and re-introduction must be controlled to avoid unwanted diaphragm distortion. This is accomplished by providing portals into the housing chambers which are proportional to the volumes therein. The gases thereby pass into and out of the chambers at a rate proportional to the volume, thereby maintaining equal pressures in the housing chambers.
REFERENCES:
patent: 1550651 (1925-08-01), Charter
patent: 3734387 (1973-05-01), Sannipoli
patent: 4120206 (1978-10-01), Rud, Jr.
patent: 4162692 (1979-07-01), Greer et al.
patent: 4172387 (1979-10-01), Ezekiel et al.
patent: 4291218 (1981-09-01), Myhre
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