Encircling and Segment Coils
Encircling Test Coils are available between 1 mm and 180 mm OD.
Segment Test Heads are used for 42 mm to 500 mm OD range.
A simple swiveling mechanism keeps a segment test head aligned with the weld-line while testing seam welded tubes. The magnetic yoke saturates the tube for suppressing noise due to permeability variations.
Magnetic saturation is necessary when testing ferromagnetic tubes for suppressing noise arising out of permeability variations. Saturation coils are supplied to provide the DC magnetic field required to saturate the tube magnetically as it passes through an encircling test coil fitted inside the saturation coil.