Driving force variation in weld pool affected by current density and flow velocity of gas tungsten arc welding

被引：0

作者：

Sakai, Tadashi ^{[1
]}

Taki, Hiroyuki ^{[1
]}

Iwao, Toru ^{[1
]}

Tashiro, Shinichi ^{[2
]}

Tanaka, Manabu ^{[2
]}

Yumoto, Motoshige ^{[1
]}

机构：

[1] Department of Electrical and Electronic Engineering, Tokyo City University, Setagaya-ku, Tokyo 158-8557, 1-28-1, Tamadutsumi

[2] Joining and Welding Research Institute, Osaka University, Ibaraki 567-0047, 11-1, Mihogaoka

来源：

IEEJ Transactions on Power and Energy | 2012年 / 132卷 / 05期

关键词：

Arc welding; Current density; Driving force; Flow velocity; MHD simulation; Weld pool;

D O I：

10.1541/ieejpes.132.486

中图分类号：

学科分类号：

摘要：

In arc welding, Gas Tungsten Arc Welding (GTAW) is suitable when good quality and a good surface are required. However, the weld shape is shallow and wide. Furthermore, GTAW welding is slow and inefficient. A deep weld shape is necessary to increase the welding speed. The heat input from the arc and convection flow of the weld pool in formation of weld pool are important. The convection flow varies along with the driving force. Past research has indicated some relation between the driving force and arc characteristics. In this study, the driving force in the weld pool changes with the current density. Flow velocity is simulated, and this relativity is elucidated. The Lorentz force, drag force, and Marangoni effect are focused in driving forces. Consequently, the Lorentz force of the axial direction decreases in direct relation to the -0.60th power of current density near the cathode in the maximum force. This force in the center of the axial direction decreases in relation to the -0.62th power of the current density. In addition, the drag force increases in relation to the 1.70th power of the maximum flow velocity, and the Marangoni effect decreases in direct relation to the -0.20th power of the maximum flow velocity in the maximum force. The driving force is apparently dependent on the arc current density and flow velocity. © 2012 The Institute of Electrical Engineers of Japan.

引用

页码：486 / 492

页数：6

共 4 条

[1]

Fujii H., Nogi K., Effect of four driving forces (plasma stream, electromagnetic force, surface tension and buoyancy) on convection in molten pool, J. Plasma Fusion Res., 83, 2, pp. 157-160, (2007)

[2]

Tanaka M., Ushio M., Ikeuchi M., Kagebayashi Y., In situ measurements of electrode work functions in free-burning arcs during operation at atmospheric pressure, J. Phys. D: Appl. Phys., 38, pp. 29-35, (2005)

[3]

Beult J.L., Fitzpatrick V.F., Timmerman C.L., Carter J.G., Oma K.H., In situ verification of transuranic waste: An updated systems evaluation and applications assessment, Battelle, PNL-4800 suppl-1, US-70, (1987)

[4]

Tanaka M., Ushio M., Lowke J.J., Numerical analysis for weld formation using a free-burning helium arc at atmospheric pressure, JSME Int. J. Ser. B., 48, pp. 397-404, (2005)

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