Abstract
A three-dimensional high frequency tube welding heat model has been developed by using electro magnetic and heat conduction finite element methods. Eddy current density distribution at a static state is calculated by means of a frequency response analytic law. Heat transfer in the tube circumferential and longitudinal direction is calculated with heating and cooling. This model is verified by experiments with laboratory-scale electric resistance welding mill. The analysis has good agreement with the actual measurement. This model can satisfactorily simulate the eddy current density distribution and the temperature distribution in the high frequency tube welding. The influences of welding frequency, welding speed, and magnetic permeability of impeder on a temperature distribution of a tube are quantitatively clarified.
