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.

为了研究轴向磁场对K-TIG焊接的影响，使用专门设计的轴向磁场装置和试样进行了实验。电弧钥匙孔的实时轮廓是通过钢/玻璃夹心样品捕获的，并且电弧电压是同步测量的。在没有AMF的典型焊接条件下，弧形显示为对称的钟形。施加AMF时，弧形看起来像锣，弧的顶部被压缩到割炬中，而底部则沿径向扩展。弧的后端点可以代表焊件的渗透状态。建立了单个粒子描述模型，以分析在AMF影响下的弧形。阐明了AMF改善电弧渗透能力的机理。电弧发射面积随着AMF的施加而减小。这种降低导致电弧力和电弧压力的增加，最终导致穿透能力的提高。因此，这项工作为更好地了解AMF对K-TIG焊接的影响奠定了坚实的基础。