**Gas Tungsten Arc Welding with Synchronized Magnetic Oscillation**

Thiago Resende Larquer and Ruham Pablo Reis

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/64158

#### **Abstract**

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52 Joining Technologies

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The search for improvements in mechanized/automated welding techniques has been intense due to skilled labour shortage. In this line, the combination of operational modes (polarity and/or metal transfer mode) within a process has gained attention, since it expands the adjustability of the arc energy. By combining this feature with arc motion, the arc energy delivered to the workpiece can be optimally distributed. Therefore, this work exploits the synchronization between arc magnetic oscillation and gas tungsten arc welding (GTAW) process to control weld bead formation. A system was devised to control the magnetic oscillation and a welding power source synchronously. Charac‐ terization of the synchronized magnetic oscillation was carried out based on highspeed filming and electrical data. The welding process was then synchronized with the magnetic oscillation varying the level of welding current according to the arc timeposition, being the effect on weld bead width considered for analysis. Welding without oscillation and with unsynchronized magnetic oscillation were taken as references. The synchronized magnetic oscillation made possible to achieve larger weld bead width on the side with higher current level and longer lateral stop time and vice versa. This technique might be beneficial to applications where extreme weld bead control is required.

**Keywords:** magnetic oscillation, arc welding, GTAW
