Increasing the Stability of the Process of Surface Heating of a Plate by a Moving Plasma Source

Abstract

Physico-Technological Institute of Metals and Alloys of the NAS of Ukraine (Kyiv, Ukraine)

UDK 533.951.8: 621.74.046

The research carried out in this work is aimed at optimizing the technological schemes and modes of heating metal plates with a concentrated energy source to obtain a flat liquid bath of melt under conditions of continuous action of the heat source. As well as the search for methods to stabilize the heating process, the uniformity of its parameters in order to use local heat treatment in a new hybrid method of production of bimetallic and multilayer products in a continuous process. The paper presents the results of research on the parameters and conditions of application of the method of surface heating of a metal plate using plasma. The critical and maximum permissible modes of surface heating in an oxidizing medium that satisfy the conditions of the liquid-phase connection during the subsequent pouring of the liquid melt have been studied. The penetration depths of metal surfaces under different processing conditions are determined. Various schemes of realization of this method of local heating are developed, results of experimental researches are presented and the most rational way of uniform and steady surface heating of a metal plate is defined. The optimal heating parameters that increase the stability and uniformity of this process, as well as provide conditions for creating a surface micrometallurgical melt bath of sufficient size and time of its existence - as necessary prerequisites for the entire continuous technological process of bimetallic and multilayer products. To increase the processing speed, as well as to expand the zone of influence of the heat source and increase the productivity of the technological process as a whole - the method of scanning heating is proposed, which consists in superimposing oscillations of the plasmatron with plane-parallel movement of the processed plate. It is shown that plane-parallel scanning makes it possible to increase the stability of the plasma arc combustion process, as well as to obtain a heating zone of different widths, which increases the range of products obtained for the proposed new method of creating bimetallic and multilayer products.

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