Several Factors Affecting the Coating Thickness Gauge's Measurement Accuracy
The base metal's magnetic characteristics are 1.
In order to prevent the influence of heat treatment and cold working factors, it should be used to measure magnetic thickness rather than the base metal's magnetic change, which can be considered modest in practical applications. The test piece to be coated can also be used for calibration in addition to the standard sheet, which is utilized to calibrate the equipment.
2. Base metal's electrical characteristics
The base metal's conductivity, which is influenced by its material composition and heat treatment process, has an impact on the measurement. A standard sheet with the same characteristics as the base metal of the test piece is used to calibrate the instrument.
3. Thickness of the base metal
Every instrument has a crucial base metal thickness. The measurement is unaffected by the base metal's thickness above this point.
4. Edge outcomes
The instrument responds quickly to changes in the test piece's surface form. Therefore, it is unreliable to measure close to the test piece's edge or inside corners.
Fifth Curvature
The measurement is impacted by the test piece's curvature. With a reduction in curvature radius, this impact always becomes more pronounced. Measurements made on the surface of bent test pieces are therefore unreliable.
6. The test component deformed
Soft-covered specimens can be distorted by the probe, making it impossible to collect accurate data on them.
7. Surface abrasion
The measurement is influenced by the base metal's and the coating's surface roughness. The impact increases as the roughness increases. Rough surfaces will lead to systematic error and accidental error; to combat this accidental error, the number of measures should be increased at various points for each measurement. If the base metal is rough, it is also necessary to take several positions on an uncoated base metal test piece with a similar degree of roughness in order to calibrate the instrument's zero point; alternatively, you can dissolve and remove the covering layer from the base metal using a non-corrosive solution before calibrating the instrument. zero.
(8) The magnetic field
The work of measuring magnetic thickness will be greatly hampered by the high magnetic field produced by the nearby electrical equipment.
9. Attached materials
The device is sensitive to chemicals that act as adhesion barriers, preventing the probe from making close contact with the surface of the covering layer. In order to ensure direct contact between the instrument probe and the surface of the test item, the adhesive materials must be eliminated.
10. Probe pressure and head orientation to the side
The amount of pressure the probe applies to the test piece will impact the measurement's reading, so the pressure needs to be constant. The measurement is impacted by how the probe is positioned. The probe should remain parallel to the sample's surface throughout the measurement.
