Thermo-stressed state of a wear resistante layer during the electrocontact surfacing

The mathematical model of the thermo-stressed state of a wear resistant layer at electrocontact surfacing with wire has been developed. The mathematical model has been made up on the base of the slip lines fields method that takes into account the two-dimensional character of the plastic forming in the sections of the thermodeformation area. The mathematical model makes it possible to predict the physical and mechanical properties of the deposited layer as well as the forming character of the layer. The temperature distribution in the deposited layer in the thermodeformation area has been investigated. The qualitative and quantitative impact of the heating temperature of the deposited layer on the stresses and deformations distribution along the thermodeformation zone has been investigated. This made it possible to determine more accurately the material mechanical properties changes and the levels of the stressed and deformed state during the electrocontact surfacing process. So the real nature of the stresses distribution at the displacement of the material was described, which allows to determine the changes of the stress and strain state levels in the process. The results of the proposed mathematical models allow to choose optimal modes of heating and deforming the wire in order to obtain a high quality joint of the base material and the deposited layer at electrocontact surfacing and to prevent such defects as lack of fusion that result in low adhesion strength of the joint.