Authors: N.V. Ababkov, M.V. Pimonov, E.E. Levashova

Title of the article: Improvement of contact spot welding technology of reinforced net used as anchoring element

Year: 2021, Issue: 3, Pages: 26-33

Branch of knowledge: 02.02.10 Welding, related processes and technologies

Index UDK: 621.791.05:620.179

DOI: 10.26730/1999-4125-2021-3-26-33

Abstract: Roof-fastening elements in mining enterprises, namely, reinforcing mesh made by semi-automatic welding in a shielded gas environment, have a high cost, therefore, to increase the competitiveness of products, it is advisable to use other welding methods. Reinforcing mesh, used in mines in Russia as an element of roof bolting, operates under conditions of drilling and blasting tunneling operations and experiences loads that require high quality welded joints. The poor quality of the design under consideration can lead to accidents at mines and to human casualties. The article analyzes the methods of manufacturing roof-fastening elements for mining enterprises - reinforcing mesh. It is shown that the use of resistance spot welding is preferable. Variants of improving the technological process of welding reinforcing bars are proposed. When welding products, a problem was revealed, which consists in a decrease in the mechanical characteristics of steel A500C in the heat-affected zone due to an insufficient thermal cycle of welding. To solve this problem, it is proposed to use other modes of resistance welding, which provide preliminary heating of the electrodes. The tests of welded joints obtained by different modes of resistance spot welding for static tension, macrography and hardness were carried out. The results of tests of welded joints obtained in different modes of resistance spot welding for static tension, macrography and hardness indicate the necessary strength characteristics of welded joints.

Key words: contact spot welding reinforcing mesh roof fastening elements roof bolting macrography mechanical tests hardness cross connection strength

Receiving date: 18.04.2021

Publication date: 02.07.2021

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