MAGNETIC PARTICLE INSPECTION

LET US EXCEED YOUR EXPECTATIONS FOR MAGNETIC PARTICLE INSPECTION.

Magnetic Particle Inspection (MPI) is a relatively low cost, yet highly effective non-destructive testing method used to identify surface and near-surface defects in ferrous metal parts or components, including castings, forgings, weldments and machined or stamped parts.

At QAI, we conduct fast and efficient wet magnetic particle inspection on a daily basis and employ a systematic approach in accordance with ASTM E1444 guidelines. This process begins before actual testing commences.

GENERAL 7-STEP INSPECTION PROCESS

• STEP 1 – Clean part as needed with a solvent degreaser so it’s free of oils and contaminants.
• STEP 2 – Secure part between head and tail stock of wet bench machine. Using a “head shot,” a pre-determined amount of electrical current is applied to magnetize the part according to the standard (ASTM E1444). Some test specifications call for multiple head shots.
• STEP 3 – Bathe part in wet flourescent suspension solution that contains iron oxide particles, as an electric current is applied.
• STEP 4 – With the magnetic bench machine enclosed within a darkroom enclosure, UV light is applied to identify indications of any defects that appear in relation to the direction of the magnetic field applied to the part.
• STEP 5 – Depending upon the specific test requirements, one or more “coil shots” may also be applied to the part to identify any discontinuities that run in the opposing direction.
• STEP 6 – Demagnetize the part.
• STEP 7 – Following this thorough visual examination, the part is accepted or rejected, based upon pre-defined criteria. Failed parts are isolated from accepted parts and tagged accordingly.