Inter-verification of equipment using the x-control card in the Laboratory for Material Testing in the Mining and Metallurgy institute Bor

Abstract

In the modern business of accredited testing laboratories according to the requirements of the SRPS ISO/IEC 17025 standard - General requirements for the competence of testing laboratories and calibration laboratories, the most important thing is the correctness of the testing equipment. The work procedure of the Laboratory for Material Testing in the Mining and Metallurgy Institute Bor requires checking the correctness of equipment twice a year in order to obtain the reliable and valid test results. This paper presents the procedure of intermediate verification the correctness of a device for testing the metal materials by tensioning, using a X-control card. The Xcontrol card is an auxiliary tool for collecting, processing, analyzing and displaying data in order to ensure the quality of products and processes. It belongs to the Statistical process control - SPC. The control chart that is created as a result of the statistical processing of the obtained data of tensile strength of wire on a tensile testing device shows the measure of quality the device correctness in the laboratory. The main goal of the X-control card is a very fast detection of errors during the work process of the Laboratory for Material Testing in the Mining and Metallurgy Institute Bor, i.e., checking the correctness of device.