The Study Of Arc Simulation In Non-consumable Welding

Non-consumable electrode arc welding has no splash, good welding quality, etc., but low welding efficiency, deposition efficiency and slow restricted its development. TIG welding and plasma arc welding are non-consumable electrode arc welding, the welding arc, has a greater energy density gap. The plasma arc is an arc on the basis of the development of TIG, has a high energy density, the plasma stream power can be achieved side welding forming, high welding efficiency, deposition efficiency, and therefore has broad prospects. Since Keyhole plasma arc welding process is difficult to control the hole, so its use is constrained. Welding arc welding process as heat source and power source, the morphology of the hole formed during the welding process and the bath has an important role, the study heat and mass transfer effects on the plasma arc welding process is very necessary. In this paper, free-burning arc and plasma arc welding numerical simulation, while taking advantage of high-speed imaging technology for droplet transfer with the hot wire arc and analyzed to determine the heat and mass transfer conditions.Serials, conservation of momentum in fluid mechanics based on quality, energy conservation and the magnetic vector component equations, axisymmetric free arc mathematical model. Freedom arc temperature field, electromagnetic field, flow field were analyzed, and the results of the literature using Maxwell’s equations were compared, the results show good agreement between the two distribution trends.The establishment of a two-dimensional constraint type plasma arc welding mathematical model to establish its boundary conditions, using SIMPLE algorithm, the plasma arc arc characteristic calculation. Plasma arc welding arc and the free comparison in the same welding current 140 A inferior, plasma arc welding arc attachment of the anode workpiece is up to 15000 K higher than the free arc at the anode around 5000K; etc. Maximum flow rate of the ion plasma arc welding arc axially free 2 times; the role of the anode workpiece arc pressure is 20 times that freedom arc. While varying the welding current, plasma gas flow, tungsten within shrinkage, nozzle diameter and other parameters, plasma arc welding temperature field, electromagnetic field, flow field simulation analysis carried out, the results show that the welding current increases 20 A, plasma Arc welding temperature can be increased more than 1000 K, the plasma flow velocity increase of 13.6%-19%, the anode arc pressure by nearly 200 Pa. Increasing the plasma gas flow velocity and the main plasma arc pressure greater impact. After the plasma gas flow rate per unit volume increase flow velocity and so that it can be increased by 20%, the anode of the workpiece to improve the arc pressure is 300 Pa or more. At the same time a very tungsten shrinkage increases, nozzle diameter narrowing could improve arc temperature, velocity and anode plasma arc pressure artifacts, help welding efficiency. Plasma arc welding and flow state study a compressed state, consistent with the hypothesis.Arc shape and numerical form a high-speed imaging technique welding current, plasma gas flow rate and other parameters of the plasma arc of change contrast, both the goodness of fit in better shape. While the arc and droplet transfer case hot wire filled K-PAW analysis, the results showed that the hot filament current can improve the welding deposition efficiency. Model established in this paper and the use of high-speed imaging such as filling hot wire arc plasma arc study on the establishment of a foundation.