The publication examines the problems of concentrator of elevated tension formation in pillars and ore massif. The article presents the results of modeling the stress state of interchamber pillars and ore deposits, using specialized geomechanical software PRESS 3D URAL. In the process of numerical experiments, it was found that the increase of natural flexibility in pillars leads to a decrease of normal stresses in comparison with the variant of a stiff scheme. If interchamber pillar involves different varieties of ores, there is a redistribution of stress on the site with more stiff ores. The article shows that the stress state control of interchamber pillars and ore massif in conditions of OJSC «Sevuralboxitruda» can be achieved by drilling relief holes.
Various heat sources effect on the contact tip of the welding torch for MIG/MAG welding has been considered. Factors affecting heating rate and contact tip temperature during welding have been described. Experiments on heating rate and contact tip temperature for various welding conditions have been presented. Sources of heat, exerting maximum influence on contact tip heating have been identified.
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