期刊
WELDING IN THE WORLD
卷 66, 期 8, 页码 1675-1689出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s40194-022-01317-1
关键词
GTAW; Longitudinal magnetic field; Arc physics; Weld bead morphology
资金
- Coordination of Superior Level Staff Improvement (CAPES)
This study experimentally investigated the effects of applying an external longitudinal magnetic field on arc welding and found that both the intensity and direction of the magnetic field had an impact on the arc and weld properties.
Works addressing the effects of longitudinal magnetic fields in arc welding are still scarce in the literature, and most of them have a theoretical approach. With that in mind, the present work aims to investigate, through an experimental approach, the effects of applying an external longitudinal magnetic field on the physical aspects of the arc and the applicability in TIG welding. For that, tests were carried out using welding currents of 50 A and 100 A and magnetic fields of up to 42 mT. As a result, changes in the stagnation pressure profile and arc constriction were verified. With the results, welding tests were performed in order to verify the effects of such changes in the weld bead morphology and microstructure. Showing that penetration could be reduced and the weld bead could be widened by increasing the external magnetic field intensity, yielding a more refined microstructure in the molten zone. Furthermore, the applied magnetic field direction was observed to have an effect on the unilateral displacement of the weld bead.
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