Investigation into the arc profiles and penetration ability of axial magnetic field-enhanced K-TIG welding by means of a specially designed sandwich

作者：Cui, Yanxin; Kang, Youping; Shi, Yonghua^*; Chen, Jinrong; Wang, Zishun; Wang, Jinyi

来源：Journal of Manufacturing Processes, 2021, 68: 32-41.

DOI：10.1016/j.jmapro.2021.05.025

• K-TIG welding
• Axial magnetic field
• Arc emitting area
• Arc voltage
• Single particle description

To investigate the influence of an axial magnetic field on K-TIG welding, experiments are carried out with an specially designed axial magnetic field device and specimen. The real-time profiles of the arc-keyhole are captured through a steel/glass sandwich specimen, and the arc voltage is measured synchronously. The arc shape appears as a symmetrical bell under typical welding conditions without an AMF. When an AMF is exerted, the arc shape appears like a gong, with the top of the arc constricted to the torch while the bottom spreads in the radial direction. The rear endpoint of the arc can represent the penetration status of the weldment. A single particle description model is established to analyze the arc shape under the influence of the AMF. The mechanism of the improvement effect of the AMF on the arc penetration ability is clarified. The arc emitting area decreases with the exertion of the AMF. This decrease leads to an increase in the arc force and arc pressure, which ultimately results in improvement in the penetration ability. This work thus lays a solid foundation for better understanding the influence of an AMF on K-TIG welding.