Method of detecting a pinhole at a welded portion of an article

Details Method of detecting a pinhole at a welded portion of an article Method of detecting a pinhole at a welded portion of an article

1992-09-21

1993-08-17

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

73 492, 73 498, G01M 302

Patent

active

052358453

ABSTRACT:
Suction is applied to a pipe of an article. Then, the interior of the pipe is maintained under vacuum conditions for a period of several seconds. This is checked or monitored by a pressure switch. If the pressure in the pipe is raised from the predetermined level, then a pinhole is formed at a welded portion of the pipe to be examined.

REFERENCES:
patent: 3101607 (1963-08-01), Taylor et al.
patent: 3524342 (1970-08-01), Hobbs
patent: 3800586 (1974-04-01), Delatorre et al.
patent: 4002055 (1977-01-01), Kops
patent: 4294107 (1981-10-01), Walle
patent: 4513605 (1985-04-01), Hawerkamp
patent: 4683745 (1987-08-01), Broughman, Jr. et al.
patent: 4715214 (1987-12-01), Tveter et al.
patent: 4991426 (1991-02-01), Evans
patent: 5042289 (1991-08-01), Jensen

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