The Rework Method of Mining Equipment Parts Operating in Conditions of the North
Abstract
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 ele- ments (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 en- terprises of the Republic of Sakha (Yakutia) have shown their operability and economic reasonability.
Keywords
pulsed arc welding,
deposited layer,
microstructure,
drill bit of bulldozer ripper,
microhard- ness,
wear,
rework.
Supporting agencies: the work was carried out with a financial support in accordance with the «The Arctic» project in 2014–2017 under the Basic Research Program of the Presidium of RAS «Fundamental Exploratory Research in the Interests of the Russian Arctic Development» for 2014–2018.
About the Authors
Nikolay Innokentievich Golikov
Larionov Institute of Physical and Technical Problems of the North SB RAS
Russian Federation
Russian Federation
Yuriy Nikolaevich Saraev
Institute of Strength Physics and Materials Science SB RAS
Russian Federation
Russian Federation
Ruslan Prokopievich Tikhonov
Larionov Institute of Physical and Technical Problems of the North SB RAS
Russian Federation
Russian Federation
Sergey Vladimirovich Semyonov
Larionov Institute of Physical and Technical Problems of the North SB RAS
Russian Federation
Russian Federation
Kseniya Valer’evna Stepanova
Larionov Institute of Physical and Technical Problems of the North SB RAS
Russian Federation
Russian Federation
Nikolay Nikolaevich Xarbin
Larionov Institute of Physical and Technical Problems of the North SB RAS
Russian Federation
Russian Federation
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Review
For citations:
Golikov N.I., Saraev Yu.N., Tikhonov R.P., Semyonov S.V., Stepanova K.V., Xarbin N.N. The Rework Method of Mining Equipment Parts Operating in Conditions of the North. Arctic and Subarctic Natural Resources. 2017;22(4):87. (In Russ.)
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