Hardness calculations on metals and a are important for the manufacturing of different things: from automobiles to electrodes. Hardness qulaity control is used in various fields like machine engineering, metallurgy, mining and energy resource extraction.
Metal hardness measurements are performed with the help of stationary or bench and portable hardness testers. The operating principle of stationary hardness testers on Rockwell 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 use the ultrasonic contact impedance method. The result of measurements on portable hardness testers is recalculated into hardness values on the Rockwell scales. Usually portable hardness testers have the following error limits of hardness measurements: ± 2 HRC on Rockwell scales.
The following is why portable Rockwell hardness testers have an advantage. 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. The cost of portable hardness testers is lower than that of stationary ones. 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 field
There are several other ways for hardness to be measured, but the Rockwell test is the easiest one to perform. The portable tester provides an accurate measurement that can then be converted to a number on the hardness scale. The device is also highly versatile, and metals of nearly any size and shape can be used
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