Magnetic Particle Inspection (MPI) Equipment
Standard Test Pieces
MPI Test Pieces
Johnson & Allen supply a range of test pieces for validation of MPI systems.
Product Data
| Application | |
| TP1 - Test Piece 1 |
Current Flow 0 to 1,000A |
| TP2 - Test Piece 2 | Current Flow 1,000 to 3,000A (RRP58004) |
| TP3 - Test Piece 3 | Current Flow 3,000 to 10,000A (RRP58004) |
| TP4 - Test Piece 4 | Mag. Flow - Contains 5 Holes (RRP58004) |
| TP5 - Test Piece 5 | Mag. Flow & Coil - Contains 1 Hole (BS6072) |
Method of use for TP1, TP2 & TP3
For the first use of your test piece, follow the procedure outlined below when the unit has just been calibrated and there is fresh ink in the tank:
- Ensure that the test piece is thoroughly degreased and free from corrosion and oxidation.
- Clamp the test piece between the contacts on the head and tailstock of your bench unit.
- Apply magnetic ink while the current is flowing.
- Establish the current required to make the hole nearest the outer surface of the ring visible on the outer surface.
- Further increase the current to establish indications from the other two holes on the outer surface of the ring.
- Note the current required to establish each hole indication.
- If the MPI process is functioning correctly each hole should be visible at each subsequent use of the test piece.
- Repeat the test for each current wave form which your magnetising unit is equipped with.
- Please note that the deeper hole is unlikely to show positively using an alternating current wave form.
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