Electric heating – Metal heating – By arc
Patent
1979-10-09
1981-10-20
Albritton, C. L.
Electric heating
Metal heating
By arc
137469, 251356, B23K 1500
Patent
active
042963079
ABSTRACT:
A manufacturing method of the valve disk of spring loaded safety valves comprising, making its bottom portion as the pressure receiving surface, a cup-shaped center portion having an annular protrusion slightly inwardly from the peripheral edge of its bottom and a cylinder provided with an inwardly extending annular flange (valve lip) formed through bending its lower end, which is formed by continuous metal fibers, and contacting those two parts. More particularly, securing tight contact between the stage portions provided at least with one step beforehand around the outer periphery of said center portion and the inner periphery of said cylinder respectively when both are set in and, at the same time, maintaining an extremely narrow and uniform space between said annular protrusion and annular flange. Welding the contacting surfaces of said center portion and cylinder at a stretch by electronic beam.
REFERENCES:
patent: 3219311 (1965-11-01), Siver
patent: 3433250 (1969-03-01), Hagihara
patent: 3454740 (1969-07-01), Foulquier et al.
Lyman et al., "Electron Beam Welding", Metals Handbook, 8th Edition, vol. 6, Aug. 1971, pp. 522, 535, 555, 563.
Albritton C. L.
TOA Valve Co. Ltd.
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