Ultrasonic Portable Hardness Testers (UCI hardness testers)



During the past 20 years portable hardness testers have gained widespread. For the most part this is explained by the possibility to use them in the field, as well as measure hardness directly on a detail of any shape and in any place. Besides, the measurement result can be indicated at once on different scales. In general, portable hardness testers are divided into two categories: dynamic and ultrasonic. The operating principle of dynamic hardness testers is based on the measurements of the velocity of the pin rebound from the tested sample. This method requires that the tested sample be rather massive.

The operating principle of portable ultrasonic hardness testers is based on the measurements of the frequency of the indenter free oscillations. Portable ultrasonic hardness testers consist of a probe and an electronic module. The probe is equipped with an indenter. Usually it is a Vickers diamond pyramid, but in different portable ultrasonic hardness testers one can find other versions of indenter designs. The indenter has its own oscillation frequency, during the penetration of a probe with indenter into the tested sample the frequency of the indenter free oscillations changes. It is the very change of the frequency that helps to determine the hardness of the sample that is tested with a portable ultrasonic hardness tester. An advantage of these hardness testers is that they help to measure the hardness of non-massive articles. The main factors for successful use of portable ultrasonic hardness testers are the thickness of the tested area and the surface quality. The thickness of the tested sample should be no less than 3 mm. Portable ultrasonic hardness testers leave very small indentations, which makes them quite useful for the non-destructive control of various metal and alloy components. Penetration of the indenter into the sample is performed by an operator, that is why the repeatability of measurement results by a portable ultrasonic hardness tester may depend on the operator's experience. To reduce the operator's influence on the hardness measurement, the portable ultrasonic hardness tester can be fixed on a support. Portable ultrasonic hardness testers usually have the following error limits of hardness measurements: 2 HRC on Rockwell scales, 12 HB on Brinell scales, 18 HV on Vickers scales, 3 HSD on Shore "D" scale. They are convenient and easy-to-use, and the measurements on them are conducted faster than those on stationary hardness testers. Portable ultrasonic hardness testers are widely used in machine engineering, metallurgy, construction.


See also:

Miniature ultrasonic hardness testers

Rockwell hardness tester -HRC
-HRC / MET-RC50
Rockwell
hardness tester
Brinell hardness tester -HB
-HB / MET-B50
Brinell
hardness tester
Vickers hardness tester
-HV / MET-V50
Vickers
hardness tester
Shore hardness tester MET-HSD
MET-HSD / MET-HSD50
Shore
hardness tester


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