Magnetic Field Flux Strip

The field flux strips are used to detect appropriate levels of magnetic field strength and directional orientation during the magnetic particle testing process.  They are made of highly permeable, ferromegnatic material with slots with varying widths.

    The strips are great because:

• They are easily applied to the inspected component
• They can be used with either wet or dry methods when using the continuous magnetization
• They are repeatable as long as orientation to the magnetic field is maintained
• They can be used repetitively

 Product Comparison

Type 1 indicators are typically used for general engineering applications and Type 11 are used for aerospace applications. Both types consist of three laminations measuring SOx 12 mm which are fixed together to form a sandwich structure wh ich is nominally 0.15 mm thick. The outer lamination has 3 interruptions which are parallel to the long side, The width of these interruptions and the material of the outer laminations means that Type 1 indicators respond to a weaker field than Type 11 strips . Both types are protected by a polymeric layer and can be differentiated by the Roman numeral next to the Ely logo.

Flux Indicators have the advantage of being flexible enough so that they can be bent to fit the contours of a workpiece, but robust enough to enable them to be used many t imes. They may also be cut into smaller pieces to allow them to be fixed in recesses and otherwise inaccessible locations on the workpiece.

METHOD OF USE

Attach one flux indicator to a vertical surface of the workpiece under test so that it’s length is at right angles to the direction of the applied current and attach a second at right angles to the first. Magnetise the workpiece by the use of the same electric current wave form as will be used for the inspection and by the same technique.

The magnetisation time will vary according to the self inductance of the workpiece, but should not be less than 3 seconds. While the workpiece is being magnetised apply magnetic particles. It is essential that the application of magnetic particles stops before the end of magnetisation.