摘要：Keyhole-mode welding is an advantage of plasma arc welding (PAW), and much research has been conducted on keyhole formation and weld pool geometry. However, researchers usually constructed equivalent heat source models to represent the actual thermal arc energy. A unified keyhole PAW model was constructed to make a comprehensive analysis of the keyhole-mode heat transfer originating from the electro-magneto-thermo conversion within the plasma arc. The magnetic vector potential formulation was applied to obtain a more accurate electromagnetic field. Joule heating, electron energy transfer, and electromagnetic force were all taken into account. Temperature field and velocity field in arc region and workpiece were simultaneously predicted. It is found that the radial heat conduction flux is about two times of that in the axis direction along the keyhole wall. All heat fluxes jump dramatically near the joint of keyhole wall and top metal surface. Current density and electromagnetic force distributions revealed that there are highest Joule heating and electromagnetic effects near the electrode tip, and they decrease sharply along the radial direction. The experimental test was carried out on the 304 stainless steel, and the experimental images agree well with the calculated results. The orthogonal test shows that distance from torch to the workpiece, shrinkage of tungsten electrode, and orifice diameter are of the primary effect on the weld bead geometry, and the shielding gas flow rate has the least impact.

关键字：Electro-magneto-thermo conversion Plasma arc welding Keyhole-mode heat transfer Joule heating Fluid flow

ISSN号：0268-3768

卷、期、页：卷: 101 期: 9-12 页: 2497-2507

发表日期：2019-04-01

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）,EI（工程索引）

发表期刊名称：INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

参与作者：Wu, Chuansong

通讯作者：王领

第一作者：李岩

论文类型：期刊论文

论文概要：李岩,王领,Wu, Chuansong，Simulation of keyhole plasma arc welding with electro-magneto-thermo-hydrodynamic interactions，INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY，2019，卷: 101 期: 9-12 页: 2497-2507

论文题目：Simulation of keyhole plasma arc welding with electro-magneto-thermo-hydrodynamic interactions