A Study on the Modeling of Magnetic Arc Deflection and Dynamic Analysis of Arc Sensor

This investigation presents theoretical predictions and experimental results of the effect of a magnetic field in- tensity, initial arc length, and arc current on the deflection of a welding arc in a magnetic field. The sensitivity character- istics of an arc sensor using magnetic arc oscillation were also analyzed for gas tungsten arc welding. First, a mathemati- cal model of the magnetic arc deflection for theoretical prediction was introduced, then the model was confirmed by corre- sponding experiments. Finally, a model of an arc sensor using magnetic arc oscil- lation was set up mathematically by con- sidering the model of magnetic arc de- flection and electromagnet, as well as welding arc and welding power source. Experiments and simulations were car- ried out to investigate how welding con- ditions such as initial arc length and arc current affect the sensitivity of the arc sensor. The simulated results based on the model showed good agreement with experimental ones.