Abstract
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 (Te) and electron density (Ne) 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.
Highlights
Tungsten insert gas (TIG) welding has advantages of low cost, simple operation and high weld quality, and has been widely used in manufacturing industry
The authors’ research group have made the initial experiment to investigate the effect of a cusp external magnetic field (EMF) on two-electrode TIG (T-TIG) welding process, and pointed out that the cusp EMF could make the electron density of low-current T-TIG increased by 16%, so the physical property of the common conductive zone of the T-TIG was improved [13]
For T-TIG, the arc shape was different along x-axis and y-axis as shown in Fig. 4(c, d)
Summary
Tungsten insert gas (TIG) welding has advantages of low cost, simple operation and high weld quality, and has been widely used in manufacturing industry. Under the effect of the cusp EMF, the arc shapes of TIG and T-TIG were obviously compressed along x-axis as shown in Fig. 8(a’, c’), while elongated along y-axis as shown in Fig. 8(b’, d’).
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