The chemistry of TIG weld bead formation

TIG welding has high levels of stability and permits more refined control than the majority of other arc welding processes. However, it is well known that small changes in the chemical composition of the base metal and arc operating region can have a pronounced effect on the resulting weld bead shap...

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Bibliographic Details
Published inWelding international Vol. 29; no. 10; pp. 771 - 782
Main Author Modenesi, Paulo J.
Format Journal Article
LanguageEnglish
Published Cambridge Taylor & Francis 03.10.2015
Taylor & Francis Ltd
Subjects
A-TIG
Active control
Arc welding
Base metal
Beads
Chemical composition
Chemistry
Controllability
GTAW
Metals
oxygen
penetration
Reliability
Stability
sulphur
Tungsten inert gas welding
Welded joints
Welding
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Summary:TIG welding has high levels of stability and permits more refined control than the majority of other arc welding processes. However, it is well known that small changes in the chemical composition of the base metal and arc operating region can have a pronounced effect on the resulting weld bead shape, which reduces the ability to control and predict the process. Obviously, this reduces the reliability and controllability of TIG welding. This study reviews the variability of weld beads obtained in the TIG process, with small changes in chemical composition of the base metal, and A-TIG and TIG weldings with active gas. Aspects that are similar and unique to each case are highlighted and discussed. The mechanisms of weld bead shape presented in the literature are also presented and compared.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0950-7116
1754-2138
DOI:10.1080/09507116.2014.932990