Patents Assigned to Magfoil & It GmbH
  • Method and apparatus for magnetic testing of metallic work pieces
    Patent number: 4992732
    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.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: February 12, 1991
    Assignee: Magfoil & It GmbH
    Inventors: Karl G. Walther, Ronald G. Walther