How to choose a suitable coating thickness gauge for curved surface (non-planar) paint film

Publish Time: 2019-06-05 Origin: Site

When is selecting a ultrasonic coating thickness gauge, the user should select different measurement principles, measurement ranges and precision are based on the substrate, which should consider the environment of the measurement object from the actual situation. Especially for non-planar objects, most thickness gauges at home and abroad have clear rules for the radius of curvature. In view of the fact that some users of the north and south tides are relatively vague, we have created a schematic diagram to illustrate how to choose a coating thickness gauge for measuring steel tubes and other uneven surfaces.

The key is to look at the radius of curvature of the object to be measured (about what is the radius of curvature, suggest that everyone , here is not awkward) For the sake of understanding, the north-south tide is illustrated by a round shape, while for an object such as an ellipse, The radius of the inner cut circle itself can be. Take Yuwen's EC-770 as an example, the minimum surface radius requirement is convex 1.5mm, concave 25mm.That is to say, if it is to measure the outer wall, the smallest pipe that the ultrasonic undercarriage measurement gauge can measure is a pipe with a radius of not less than 1.5 mm; if the inner wall is measured, the radius of the object to be measured needs to be not less than 25 mm.

As shown in the figure, in general, the curved coating of R1 can also be applied to the curved coating of R2. On the contrary, the curved coating of R2 can not be applied to the smaller R1 measurement. The surface radius requirement of the coating thickness gauge is generally related to the probe structure and the coating thickness gauge itself. The measurement of the inner wall paint film thickness gauge generally uses a “line-type” coating thickness gauge, and the outer wall paint film can be both.

The author suggests that although the price of the ultrasonic thickness gauge for metal will be more expensive, the applicable environment will be more. If the budget is sufficient, it is recommended to purchase a wire thickness gauge. Of course, this article only describes how to select the minimum surface radius of the thickness gauge. The selection of the measurement principle, accuracy, probe structure, measurement range and even other measurement environments (such as underwater, corrosion) can be referred to the north and the south.

How to choose a suitable coating thickness gauge for curved surface (non-planar) paint film

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