vacuum brazing furnace numerical simulation of heater

A three-dimensional finite element model of vacuum brazing furnace heater was established. The distribution of temperature field, voltage and current density of heater during the process of transforming current into Joule heat and transferring heat to surrounding environment by radiation heat transfer was simulated by thermoelectric coupling element. Meanwhile, the overall Joule heat generation and radiation heat loss during the process are obtained by extracting post-processing data.
Numerical simulation of welding thermal process has been widely used, and its technology is becoming more and more mature and perfect. However, the simulation of vacuum brazing thermal process is relatively lacking. The heat process of vacuum brazing is characterized by the integrity of heating, the fixity and continuity of heat source, and the simplicity of heat transfer process, radiation heat transfer. Heating body is the most important part of the whole vacuum brazing furnace. It transfers the Joule heat transformed from the current into the furnace to the welding parts in the process box and other parts of the furnace through radiation heat transfer, so as to ensure that the furnace space reaches the predetermined temperature, thus completing the brazing process. In this paper, a three-dimensional finite element model of the heating body of a vacuum brazing furnace is established and its thermal process is numerically simulated. The establishment of the model is a very important step in the numerical simulation of heating body, because all the analysis is based on the model. The purpose of modeling is to establish a finite element model suitable for solution according to the actual situation and the requirements of analysis. In vacuum brazing furnace, radiation is the most important heat transfer mode. Joule heat generated by heating body through current is transmitted to welding parts in process box and other parts of furnace through radiation. Under vacuum condition, the radiation problem becomes the radiation heat transfer between solid surfaces, which depends on the radiation angle coefficient and blackness value. Since the calculation of radiation involves the calculation of radiation angle coefficient, that is, the angle of view coefficient, according to the requirements of radiation analysis, it is necessary to establish a complete geometric model.

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