Maximum Sensitivity for Detecting Flaws in Magnetic Materials
Wet Fluorescent Magnetic Particle Testing (WFMT) is the most sensitive variation of the Magnetic Particle Testing (MT) method, used to detect very fine surface and near-surface cracks in ferromagnetic materials such as steel, nickel, and cobalt alloys.
The component is magnetized while a suspension of fine fluorescent magnetic particles in a liquid carrier is applied. Any flaw that disturbs the magnetic field causes the particles to gather, forming a bright yellow-green indication when viewed under UV-A (black) light in a darkened inspection area.
Due to its superior sensitivity and clarity, WFMT is widely used in industries such as aerospace, power generation, rail, and automotive manufacturing where failure-critical parts must be thoroughly examined. BQCIS performs WFMT in accordance with international standards like ASTM E1444/E709, using certified equipment and personnel.
Key WFMT Activities
Key Benefits of WFMT
Highest Sensitivity
Capable of detecting minute cracks and discontinuities missed by visible or dry-powder MT methods.
Superior Visual Contrast
Bright fluorescent response under UV-A light produces crisp, unmistakable flaw indications.
Fast & Reliable Inspections
Once setup is complete, WFMT allows rapid scanning and evaluation of numerous components efficiently.
Surface & Near-Surface Detection
Detects flaws both on the surface and just below, ensuring thorough quality verification of ferromagnetic materials.
Success Story
WFMT Prevents Failure of Critical Automotive Gear
An automotive OEM needed to verify that hardened transmission gears were free of micro-cracks caused by grinding stress prior to assembly.
BQCIS performed Wet Fluorescent MT using a bench unit and UV-A darkroom inspection, magnetizing gears and immersing them in a controlled fluorescent particle bath.
Fine, branched cracks were clearly revealed on tooth edges, allowing the manufacturer to reject defective gears and avoid costly field failures and recalls.