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Coating Thickness Gauge Measures Accurate Conditions
Sep 19, 2018

Coating thickness gauge measures accurate conditions
 
Let's take a look at the following small series, the coating thickness gauge measures the exact conditions.
 
Base metal properties
 
For the magnetic method, the magnetic properties and surface roughness of the base metal of the standard sheet should be similar to the magnetic properties and surface roughness of the base metal of the test piece.
 
For the eddy current method, the electrical properties of the standard sheet base metal should be similar to the electrical properties of the test piece base metal.
 
Base metal thickness
 
Check if the thickness of the base metal exceeds the critical thickness. If there is no non-destructive testing resource network, use one of the methods in 3.3 to calibrate.
 
Edge effect
 
Measurements should not be made immediately adjacent to the specimen's sudden changes, such as edges, holes, and inner corners.
 
Curvature
 
It should not be measured on the curved surface of the test piece.
 
Number of readings
 
Usually because each reading of the instrument is not exactly the same, several readings must be taken within each measurement area. The local difference in the thickness of the cover layer also requires multiple measurements in any given area, especially when the surface is rough.
 
Surface cleanliness
 
Before the measurement, any adhering substances on the surface, such as dust, grease and corrosion products, should be cleaned, but do not remove any covering material.