Research on X 42 and X 52 Steel Weldability by MAG-STT Procedure
Journal Title: RECENT - Year 2013, Vol 14, Issue 38
Abstract
This paper presents research into the use of MIG-MAG welding in STT version (surface tension transfer) in the welding of root layers. The aim for researching this aspect is to increase the range of applications of the STT variant of the process. The research consisted in welding two steels, X 42 and X 52, widely used in the construction of oil fluid carrier pipelines. Each material was root welded by a different procedure. Steel X 42 was manually metal-arc root welded and root X 52 was root welded by MAG - STT. Subsequently filling layers were manually metal-arc welded to both materials. Result assessment of the completed mechanical tests showed that the samples extracted from the MAG - STT root welded specimens displayed superior mechanical properties to those manually metal-arc roots welded. Root layers were welded by means of "INVERTEC STT II" equipment made by Lincoln, and the filling layers were deposited by means of covered electrode simple manual welding equipment. The study is useful in that it certifies the applicability with good results of the discussed process in pipeline welding and also sets the groundwork for research on the welding of fittings (valves) on pipelines.
Authors and Affiliations
Radu MAZILU
Keywords
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