Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1980-12-29
1982-12-21
Combs, Ervin M.
Metal working
Method of mechanical manufacture
With testing or indicating
228104, 228155, B23P 1700, B23Q 1700, B23K 3100
Patent
active
043641610
ABSTRACT:
A tank and method for fabricating the tank are disclosed wherein a longitudinally seam welded segment of a generally cylindrical steel tube is formed by hot spinning into a cylinder. The cylinder is heat treated, shot blasted, and non-destructively tested to verify that the heat treatment is uniform and proper, that the wall thickness is as desired, and that the weld region is acceptable with no critical defects created as a result of the hot spinning and heat treating. The cylinder is pressurized with air to a predetermined pressure to verify that there is no leakage from the spun closed end of the tank. Finally, the cylinder is hydrostatically tested to a predetermined pressure level with water and the cylinder weld is simultaneously examined by means of acoustic emission with the cylinder stressed in response to the internally applied hydrostatic test pressure to determine if a paste weld condition exists.
REFERENCES:
patent: 1977987 (1934-10-01), Corby
patent: 2030818 (1936-02-01), Harter
patent: 2273736 (1942-02-01), Raymond et al.
patent: 2346423 (1944-04-01), Gray
patent: 2386246 (1945-10-01), Mapes
patent: 3068562 (1962-12-01), Long
patent: 3439405 (1969-04-01), Berman et al.
patent: 3456831 (1969-07-01), Johansson
Combs Ervin M.
The Marison Company
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