MTU-3 MPI Reference Block Type 1
EN ISO 9934-2:2002
Cracked Test Piece for the Evaluation of Magnetic Particles
The MTU-3 Test Block is used to check the sensitivity of magnetic
particle materials, assess material degradation and assess bath
contamination. This two-sided block has a variety of indications
ranging in size from small to large and each block has a completely
unique crack pattern that mimics natural cracking. Can be used
with fluorescent or visible particles. For application, ensure the
block is free from dust, oil and other repellent materials before
applying a well-mixed inspection medium. Compare your results with
the supplied reference photograph before cleaning your block
immediately to avoid permanent indications.
Usage and functional analysis
1. Verify the magnetization effect (magnetic field direction and
intensity) | MTU-3 test blocks are usually made of materials with high magnetic
permeability, When the test block is placed on the surface of the
inspected workpiece and magnetized together with the workpiece, The operator determines the direction of the magnetic field on the
surface of the workpiece by observing which directions of defects
display magnetic traces. For example, if only radial cracks are
visible, it indicates that the magnetic field is circumferential;
If only concentric cracks are displayed, it indicates that the
magnetic field is radial. |
2. Evaluate the comprehensive sensitivity of the system | The artificial defects on the test block are very subtle and can
only be clearly displayed when the entire detection system (current
value, magnetization method, magnetic suspension concentration,
cleanliness, lighting conditions, etc.) is in good condition. |
3. Daily performance verification | ·Before starting the testing work every day, or after replacing the
testing process and equipment, using MTU-3 test blocks for a quick
calibration is an important quality control step to ensure the
reliability of the testing results. This meets the regulatory
requirements of high standard industries such as aerospace, nuclear
power, and pressure equipment. |
4. Compare the performance of different magnetic suspensions | ·By using the same MTU-3 test block and the same magnetization
specification, the performance of magnetic suspensions (including
fluorescent and non fluorescent) from different batches or
suppliers can be compared. A better performing magnetic suspension
will result in clearer defect display and higher contrast on the
test block. |
During the magnetic particle testing process, the MTU-3 Type I test
block quickly and intuitively verifies and confirms whether the
comprehensive sensitivity of the entire testing system (including
equipment, magnetization method, magnetic suspension performance,
and operating process) meets the required standards, and displays
the direction of the magnetic field on the workpiece surface.
The MTU-3 MPI Type I test block is a key tool for ensuring the
reliability, consistency, and traceability of magnetic particle
testing results.
