Welding and Additive Manufacturing Modeling of Hot Wire

Abstract

This work presents an analysis of hot wire deposition during welding. In this methodology, the wire is in contact with the workpiece and the current is induced in such a way that the wire is heated almost exclusively by the Joule´s effect. Then, a combination is produced such that the speed, length and properties of the wire together with the current cause the contact point between the wire and workpiece reach the melting temperature. This technology is widely used in the nuclear industry and other industries where materials are sensitive to the heat supplied. The challenge of this modeling lies in the fact that the resistivity of the wire varies by an order of magnitude between the temperature at which the wire enters and its fusion. This is solved with a non-linear model and detailed knowledge of the electrical and thermo-physical properties.