Electricity: measuring and testing – Magnetic – By paramagnetic particles
Patent
1985-06-06
1987-09-15
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
By paramagnetic particles
324226, 324262, G01N 2784, G01R 3312
Patent
active
046942475
ABSTRACT:
Elongated ferromagnetic parts of cylindrical or polygonal cross-sectional outline are tested while rotating about their axes and while advancing longitudinally along a cushion of dry pulverulent magnetic material which is supplied by one or more pneumatic conduits into the range of one pole of a first U-shaped electromagnet whose poles extend in the longitudinal direction of but do not contact the parts. The electromagnet establishes a stray magnetic flux in the region of each defect on the ferromagnetic part which is being tested and such flux or fluxes attract pulverulent material which thereby pinpoints the locations of defects. A second electromagnet is placed next to the one pole of the first electromagnet and its poles are spaced apart from each other as considered in the longitudinal direction of the tested part.
REFERENCES:
patent: 2061692 (1936-11-01), Bagley
patent: 2518943 (1950-08-01), Schott
patent: 3249861 (1966-05-01), Pevar
patent: 3609532 (1971-09-01), Van Kirk
patent: 3614604 (1971-10-01), Reinshagen
patent: 3668517 (1972-06-01), Zemberry
patent: 3763423 (1973-10-01), Forster
Meili Ernst
Rimmele Karl
Kontler Peter K.
Mecapec S.A.
Strecker Gerard R.
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