Abstract
As a new composite welding heat source introduced in recent years, the cross-coupling arc uses a non-consumable electrode arc (plasma arc) and a consumable electrode arc (inter-wire arc) in cross-coupling, in which the plasma arc is the main arc and the inter-wire arc is the vice arc, to realize the separate control of the heat input to the workpiece, arc force, and droplet transfer. To reveal the electrical characteristics of the inter-wire arc under the action of the plasma arc, in this study, rotating probes are used to sweep across the plasma arc. When the probes rotate into the plasma arc, a circuit is formed, and the electrical characteristics of the inter-wire arc are indirectly analyzed according to the circuit: the probe centering current and input voltage are used as the physical quantities. The results show that at a certain wire feed rate, the inter-wire arc current increases with increasing input voltage. When the input voltage is low, the wire feed rate has no obvious effect on the inter-wire arc current. At a higher input voltage, where the wire feed rate is high, the inter-wire arc current decreases. With the increase in the plasma arc current, the inter-wire arc current first increases quickly and then increases slowly, and simultaneously, the striking arc time becomes longer. With the increase in the interval between the nozzle and the workpiece, the inter-wire arc current increases, but when the arc length increases to a certain limit, the slope of the welding current clearly declines.
Highlights
As an important means of metal material processing, arc welding has many advantages, such as low cost, ease of operation and high automation [1,2,3,4,5]
Experiment #3 was designed to study the influence of the interwire arc location on the inter-wire arc current, and the change rule of the probe centering current was obtained by changing the interval between the torch nozzle and the workpiece
When the probe circuit has an input voltage and the probes start to rotate into the arc, the electrons stored beforehand in the probe tips are heated to an excited state
Summary
As an important means of metal material processing, arc welding has many advantages, such as low cost, ease of operation and high automation [1,2,3,4,5]. The composite electrical properties basically maintain the electrical characteristics of each arc, but a cross-coupling arc comprises multiple arcs in cross-coupling, combining the transverse electrical characteristic and the longitudinal electrical characteristic of each arc. The aforementioned methods can only measure the electrical signals of the cross-coupling arc; they cannot directly and effectively elucidate the influence of the plasma arc on the electrical characteristics of the inter-wire arc or the effect of the inter-wire arc on the electrical characteristics of the plasma arc within the cross-coupling arc. This paper reports the current–voltage characteristic of the inter-wire arc within the plasma arc, as well as the effects of the plasma arc and the spatial position of the inter-wire arc on the current–voltage characteristics This lays the foundation for further study of the arc characteristics and the arcing mechanism of cross-coupling arcs
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