LIQUID PENETRANT INSPECTION

Liquid Penetrant Inspection is a non-destructive testing method used to detect surface breaking discontinuities on non-porous materials.

A colored (normally red) or fluorescent penetrant (dye) is applied to the part surface and is drawn into the breaking flaws through the basis of capillary action. A dwell time is allotted to allow penetrant to fully enter all potential discontinuities. The amount of dwell time will vary dependent on the temperature, surface condition and the material type. After the dwell time has elapsed, excess penetrant is cleaned off the part surface by one of the following methods:

• Water wash

• Post emulsifier

• Solvent removable

THE FIRST THREE OF THE SEVEN LPI STEPS

Following the wash, a developer is applied to the part being tested. The developer not only acts as a blotting agent, drawing penetrant out of discontinuities, but also as a contrasting background for a qualified technician to evaluate any existing indications.

We are pleased to offer all conventional Liquid Penetrant Inspection methods including:

• Visible Red/White (Water Washable)

• Visible Red on White (Solvent removable)

• Fluorescent

ADVANTAGES

• Can be used to inspect complex shaped parts

• Inexpensive

• Can be used on a wide variety of materials

• Various sensitivity products are available to suit inspection requirements

• Suited for high volume application

MAGNETIC PARTICLE INSPECTION

Magnetic Particle Examination is a non-destructive testing (NDT) method commonly used to detect surface, and slightly subsurface, discontinuities in ferrous materials.

When a part is magnetized, using either alternating or direct current, magnetic flux leakage occurs in the presence of a discontinuity. Ferrous particles, in a dry or wet suspension are applied to the examination surface and drawn into the flux leakage areas forming ‘indications’. A qualified technician then evaluates these indications, generates a report based on the findings.

We are pleased to offer all conventional Magnetic Particle Inspection methods including:

• Black and White

• Wet Fluorescent

• Dry Powder

LIMITATIONS

• Part cleanliness is essential

• Darkened area required for Fluorescent method

• Only surface and slightly subsurface discontinuities can be detected with MPI

For additional information please contact us.