Experimental Characterization of GTA Weld Pool Surface Flow Using PIV

被引:9
作者
Zhao, C. X. [1 ,2 ]
van Steijn, V. [3 ]
Richardson, I. M. [1 ,2 ]
Saldi, Z. [1 ,3 ]
Kleijn, C. R. [3 ]
机构
[1] Mat Innovat Inst, Cluster 8,Mekelweg 2, NL-2628 CD Delft, Netherlands
[2] Delft Univ Technol, Dept Mat Sci & Engn, NL-2628 CD Delft, Netherlands
[3] Delft Univ Technol, Dept Multi Scale Phys, NL-2628 BW Delft, Netherlands
来源
TRENDS IN WELDING RESEARCH | 2009年
关键词
Fluid flow; weld pool; high speed camera; particle image velocimetry; FLUID-FLOW; CONVECTION; TENSION; TURBULENCE; TRANSPORT; MOTION; METAL; MODEL;
D O I
10.1361/cp2008twr201
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To explore the physical mechanisms governing fluid flow in the weld pool, measurements of flow behaviour on the surface of a weld pool were undertaken. To date, most of the reported experimental results evaluate the surface flow by tracing single particles, rather than the whole flow field. In this paper, we calculated the whole surface flow field for a gas tungsten arc (GTA) weld pool by studying the movement of the natural oxide layer on a 316L stainless steel substrate. The surface flow is reconstructed based on high-speed camera imaging and particle image velocimetry (Ply). Unsteady flow fields were captured, which contain strong rotational flow. The Reynolds number, a dimensionless number to characterize single phase flow was calculated to analyse the flow motion and determine whether the flow in the weld pool is laminar or turbulent. The maximum velocity based on a theoretical analysis is compared with our experimental results. Finally, an analysis of error sources is made for the computed velocities and some suggestions are provided to reduce the error in the two dimensional flow fields.
引用
收藏
页码:201 / +
页数:3
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