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Publication
Retrofitting of steel T joints by plasma and tungsten inert gas dressing
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Abstract(s)
Due to economic and environmental constrains, the trend is to use the welded structures beyond their design lifespan. In these cases, an extra effort should be paid to inspection, monitoring and rehabilitation of damaged details, in order to maintain these structures in regulatory framework.
Welded structures are prone to different forms of degradation during their life cycle, but the predominant cause of in service failure of these aged structures is the fatigue of the joints. Fatigue life of welded joints is mainly influenced by pre-existing cracks and other defects in the weld toe. The presence of such defects, together with the stress concentration at the weld toe and the existing residual stress fields induced by welding, explains the poor fatigue strength of welded joints.
To improve the fatigue strength of welded joints, many different post-weld treatments can be applied to the as welded structures, some of them are considered in the welding codes.
The use of improvement techniques in welded joints to repair fatigue damaged welded structures has been tested by several authors. From them, TIG dressing is the one that presents more promising results.
This communication summarizes the results of the work developed by the author in the last decade, relevant to assess the efficiency of sustainable repair, by Plasma and TIG remelting, of steel welded structures.
Description
Keywords
Welded joints Retrofitting TIG dressing Plasma dressing
Pedagogical Context
Citation
RAMALHO, A.L. (2022) - Retrofitting of steel T joints by plasma and tungsten inert gas dressing. In ICKEM 2022 - 12th International Conference on Key Engineering Materials, Udine. Conference paper.