| In this paper,the theory of electromagnetic field and the theory of heat transfer are applied.According to the characteristics of high frequency electromagnetic induction welding,the Maxwell equations and the constitutive equations of materials are used to establish the electromagnetic field.The transient temperature field model is established by the Fourier nonlinear transient equation.Through the ANSYS finite element analysis software,the two-dimensional axisymmetric model is abstracted under the condition of the actual workpiece size,and a large amount of calculation is reduced.With reference to the existing empirical parameters,the simulation of the welding process is carried out,and the model is optimized and improved.This solution is solved directly by the magnetic field,which is different from the artificial heat source on the surface,which improves the accuracy of the simulation.This paper not only simulates the distribution of the temperature field in general,but also simulates the influence of the temperature field by controlling the different welding factors.It is easy to know that welding time,welding current frequency,coil location and inner diameter of the coil are important parameters for welding,and their influence on temperature field is not to be ignored.In this paper,the welding parameters above are simulated by the control variable method,and the results are analyzed.On the basis of the simulation,this paper uses a set of practical process parameters to verify the correctness of the simulation results.During the welding process,an infrared thermometer is used to continuously check the temperature of the same horizontal position of the inner wall of the workpiece.The obtained temperature is connected to the curve,and the curve is compared with the simulated curve,and the error is analyzed.Finally,the shear stress test of the welded joint was carried out,and the shear strength of the copper steel interface was up to 152MPa. |
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