In this publication, the different metal transfer modes of a hot-wire GTAW process with indirect resistive preheating of the wire are presented. The hot-wire GTAW process is characterized by an additional preheating unit that is used to heat the wire before it reaches the melt pool. Thus, to preheat the wire, the contact between the melt pool and the wire is not necessary. In order to examine the metal transfer of the wire, deposition welds are analysed using a high-speed camera with a laser light source as well as a data acquisition unit. The presented results comprise the impact analysis of the GTAW current, the hot-wire current, the wire feeding rate, the wire feeding angle as well as the wire feeding direction. The observed metal transfer modes can be characterized as either a constant melting bridge (cmb) between the wire and the melt pool or a recurring melting bridge (rmb). The analysis also reveals that the influence of the process parameters and thus the metal transfer mode on the bead properties is only marginal.

在该出版物中，介绍了带有间接电阻预热的热丝GTAW工艺的不同金属转移模式。GTAW热丝工艺的特点是附加的预热单元，用于在金属丝到达熔池之前加热金属丝。因此，为了预热金属丝，熔池与金属丝之间的接触是不必要的。为了检查金属丝的金属转移，使用带有激光光源以及数据采集单元的高速摄像机对熔敷焊缝进行了分析。给出的结果包括对GTAW电流，热线电流，焊丝进给速率，焊丝进给角度以及焊丝进给方向的影响分析。观察到的金属转移模式可以表征为金属丝和熔池之间的恒定熔桥（cmb）或重复发生的熔桥（rmb）。分析还表明，工艺参数的影响以及金属转移模式对焊珠性能的影响很小。