About this Abstract |
Meeting |
2021 AWS Professional Program
|
Symposium
|
2021 AWS Professional Program
|
Presentation Title |
Hybrid a Free Arc into Constraint-Arc to Improve Arc Behaviour |
Author(s) |
ZuMing Liu, JiaYu Qiu, Hao Tang, XuMin Guo, Fei Liu |
On-Site Speaker (Planned) |
ZuMing Liu |
Abstract Scope |
Arc plasma is an important heat source for modern manufacturing. However, in a single electrode arc system, the arc force and heat input are highly coupled and change towards the same direction following the arc current. The arc characteristics can hardly properly match to the requirement in some practical engineering applications. If the arc heat and the arc pressure decouple in a single arc system, the liquid pool behavior should be easier controlled. In this study, an innovative arcing system was developed based on a conventional plasma arc torch system. An outer tungsten electrode was fixed under the center orifice. After linking the outer tungsten electrode to the negative pore of an additional constant current model power, and linking the anode to the positive pore, a free arc rooting from the added electrode merges between the outer tungsten and the anode. The free arc flows close aside to the constraint arc, it is attracted by the Lorentz force to form a hybrid arc with two cathodes (the added outer tungsten and the inner constraint arc tungsten) and one anode. The constraint arc has much higher current density over the outer free arc, the added arc is allowing to change the anode heat while the pressure is still primarily controlled by the main arc. The coupling behavior was experimentally studied through analysis arc column image and arc pressure measurement. The results show that the added free arc formed by the outer electrode is fully absorbed and coupled into the constraint arc to form a single hybrid arc. The arc pressure peak value in the hybrid arc is little sensitive to outer free arc current compared with that by adjusting the center constraint arc current. The torch system provides a novel arc plasma generation method to improve the control precision in manufacturing process. |
Proceedings Inclusion? |
Definite: Other |