The Rework Method of Mining Equipment Parts Operating in Conditions of the North
Golikov N.I., Saraev Y.N., Tikhonov R.P., Semyonov S.V., Stepanova K.V., Xarbin N.N.
The article is devoted to the problem of wear and tear of parts of mining equipment working with frozen soils under low climatic temperatures and the development of a method for restoring the crowns of excavator buckets teeth and bulldozer ripper with increased performance characteristics. Deposited layers obtained by overlaying surfacing with self-shielded flux cored wire and surfacing electrodes T590 (widely used in production) for surfacing with direct current and pulse mode modulated current are investigated. It is shown that when surfacing by a pulse-arc method with T590 electrodes, the content of the main alloying elements (manganese, silicon, nickel, chromium) in the weld layer is higher than in the case of surfacing by a direct current. It has been established that the microhardness of the deposited layers at surfacing by direct current is greater than when surfacing with modulated current. The way of rework of geometrical sizes of worn-out details of mining equipment using electrodes of the E-50A type at pulsed arc welding and further hardening of a surface layer of rework details using coating material with the increased physicomechanical properties is offered. Full-scale tests of the details reworked by this method and further operation at the enterprises of the Republic of Sakha (Yakutia) have shown their operability and economic reasonability.
Key words: pulsed arc welding, deposited layer, microstructure, drill bit of bulldozer ripper, microhardness, wear, rework.
Science and Education, 2017, No.4, pp. 82-87.