Resumen
This paper presents the techniques for mathematical modeling of the geometric characteristics of surfaced surfaces, which make it possible to predict the result of experimental studies. The accuracy of existing techniques for assessing the geometric parameters of a penetration zone has been determined.It has been established that by using the distribution scheme of a heating source over a rectangular region it becomes possible to bring the estimation data closer to experimental in the surfacing rate range of 6?12 m/h. At a distribution parameter of the heating source over a width of 1.5 mm, the maximum discrepancy between the estimated and experimental values for a penetration depth does not exceed 15 % for strips with a width of 60 to 90 mm. This is due to that a given model is adequate only for cold?rolled solid strip electrodes. We have investigated an estimation scheme of temperature distribution in a semi-infinite body from a movable linear heat source with the distribution of temperature by width, making it possible to adequately assess the depth of penetration of the basic metal at surfacing with a strip electrode. The arc, which moves along the end of the strip, does not form a significant crater as is the case at surfacing with a wire electrode. The efficiency of heat transfer from arc to the main metal is determined by the convection of a liquid metal in the active part of the pool, which decreases at low surfacing speeds. The movement of a metal in this zone is linked to its movement throughout the entire volume of the weld pool. It has been established that a decrease in the temperature of a metal in the liquid layer of the weld pool within 300?500 º? when using a strip electrode, compared to the wire one, relates to the phenomenon of arc displacement along the end of a strip electrode and to a change in the heat source's concentration ratio