Arc instabilities during split anode calorimetry with the TIG welding process

被引：3

作者：

Egerland, Stephan ^{[1
,2
]}

Colegrove, Paul ^{[2
]}

Williams, Stewart ^{[2
]}

机构：

[1] FRONIUS Int GmbH, A-4600 Wels, Austria

[2] Cranfield Univ, Dept Welding Engn & Laser Proc, Cranfield MK43 0AL, Beds, England

来源：

WELDING IN THE WORLD | 2018年 / 62卷 / 04期

关键词：

TIG welding; Energy density; Shielding gas nozzle; Split anode calorimetry; Copper oxide layer; FREE-BURNING ARC; TEMPERATURE DETERMINATIONS; ELECTRICAL-CONDUCTIVITY; HEAT-TRANSFER; FLUID-FLOW; GAS; POOL; DISTRIBUTIONS; PRESSURE; SURFACE;

D O I：

10.1007/s40194-018-0588-4

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Split anode calorimetry investigations of tungsten inert gas (TIG) arcs were conducted using a large-diameter shielding gas nozzle. Some conditions displayed arc symmetry whilst others proved distinctly asymmetric. The variation of welding current and electrode tip to workpiece distance (ETWD) was studied. Decreasing the ETWD was found to increase the current density towards the arc axis but similar to a previous study of the authors, Gaussian distributions were not observed. The gas nozzle was designed to produce laminar gas flow and sound shielding behaviour; however, anode surface oxidation was found after welding, presumably caused by shielding gas contaminated with oxygen through the welding sequence. Therefore, axial arc symmetry was influenced by random effects. The conditions and reasons for the observed phenomena are explored within this paper.

引用

页码：831 / 845

页数：15

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