Portable hardness testers

Advantages of Using Portable Hardness Testers

Hardness measurements on metals and alloys are essential for the manufacturing of different types of products: from automobiles and planes to electrodes. Hardness control is conducted in such fields as machine engineer-ing, metallurgy, mining and energy resource extraction, nuclear energetics, roll production, etc.

Hardness measurements are performed with the help of stationary and portable hardness testers. The operating principle of stationary hardness testers on Vickers, Rockwell, Brinell and Shore "D" scales are described in the standards on the corresponding methods. Hardness tests on stationary hardness testers are direct measurements. Consequently, hardness tests performed using these methods are more accurate than the measurements via indirect methods.

Hardness tests on portable hardness testers are indirect measurements. Most portable hardness testers implement ultrasonic contact impedance method, as well as rebound method. The result of measurements on portable hardness testers is recalculated into hardness values on Rockwell, Brinell, Vickers and Shore "D" scales. Usually portable hardness testers 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.

Let's examine the situations where the use of portable hardness testers is convenient and efficient. Portable hardness testers are significantly lighter, they can measure hardness directly on a manufactured detail and in hard-to-reach places. Portable hardness testers are the only hardness testers suitable for conducting measurements in the field. One portable hardness tester enables the user to obtain hardness values using at least three different methods. Taking into account the fact that the cost of portable hardness testers is lower than that of stationary ones, the use of portable hardness testers is more profitable. Important characteristics of portable hardness testers are repeatability and reproducibility of measurements. Despite relatively modest accuracy in comparison with stationary hardness testers, portable units have high reproducibility and repeatability and can be successfully used for components screening, control of the product homogeneity on hardness, as well as measurements in the fields.

See also:

Miniature ultrasonic hardness testers

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

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