Influence of cusp external magnetic field on deposition rate of two-electrode TIG welding

Experiments have been conducted to investigate the influence of the cusp external magnetic field (EMF) on deposition rate of two-electrode tungsten insert gas (T-TIG) welding. T-TIG arc parameters such as arc shape, arc voltage, arc pressure, and arc plasma information were acquired respectively. Results showed that compared to TIG a higher welding current could be allowed for T-TIG due to its low arc pressure characteristic. Under the effect of the cusp EMF, the arc shape was compressed along the x-axis of T-TIG, while elongated along the y-axis of T-TIG. Besides, the peak arc pressure of T-TIG was not significantly increased by the cusp EMF. Moreover, with the action of the cusp EMF, the maximum values of the electron temperature (T-e) and electron density (N-e) of T-TIG were not significantly increased, but along the y-axis, the increments of the two parameters were gradually increased and their distributions were widened. Therefore, more arc energy was allocated on the y-axis of T-TIG by the cusp EMF, which could improve the preheating and the melting of the filler wire along the y-axis, so the deposition rate of T-TIG could be increased by 17.6% under the effect of the cusp EMF.

Automated summary

This study conducted experiments to investigate the influence of a magnetic field on the deposition rate of two-electrode tungsten insert gas welding. The results showed that the magnetic field affected the shape of the arc but did not significantly impact the arc pressure, electron temperature, and electron density. However, the magnetic field resulted in a better distribution of energy along a specific axis, improving the preheating and melting of the filler wire and increasing the deposition rate.