Method and apparatus for magnetic testing of metallic work piece

Details Method and apparatus for magnetic testing of metallic work piece Method and apparatus for magnetic testing of metallic work piece

1989-05-01

1991-02-12

Snow, Walter E.

Electricity: measuring and testing

Magnetic

By paramagnetic particles

G01N 2784, G01R 3312

Patent

active

049927329

ABSTRACT:
Method and apparatus for inspecting weld seams by means of particles of magnetizable material which align themselves in a magnetic field in a manner characteristic of faults the particles are suspended at the start of a test in a first liquid Fl.sub.1, the particles being freely mobile in the suspension and no viscosity change of the suspension taking place. Thereafter a substance is added to the suspension which effects a change of state, the particles aligned in the magnetic field thereby being fixed in their position.

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