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Indexed by:期刊论文

Date of Publication:2013-07-01

Journal:SCIENCE AND TECHNOLOGY OF WELDING AND JOINING

Included Journals:SCIE、EI、Scopus

Volume:18

Issue:5

Page Number:434-440

ISSN No.:1362-1718

Key Words:Tungsten inert gas; Activating flux; Electron temperature; Electron density; Arc voltage

Abstract:To study the effects of oxide activating flux on the arc plasma, the investigation is carried out in tungsten inert gas (TIG) welding on magnesium alloy. In this study, five oxides, ZnO, MnO2, Cr2O3, CeO2 and CdO, are selected to study the roles of activating flux on the plasma characteristics (shape, electron temperature and electron density) and the arc voltage. The mechanism is also discussed by comparisons between single TIG welding processes with and without fluxes. Results reveal that the electron temperature of arc plasma decreases sharply under the influence of oxide; however, the electron density and the arc voltage get enhanced. The reasons for the increase in arc voltage are the greater electricity resistances that result from the improved welding current density and the constriction of conduction channel.