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Arc welding
About: Arc welding is a research topic. Over the lifetime, 25393 publications have been published within this topic receiving 168182 citations.
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TL;DR: In this article, the effect of specific oxide fluxes on the surface appearance, weld morphology, retained δ ferrite content, hot cracking susceptibility, angular distortion and mechanical properties obtained with the tungsten inert gas (TIG) process applied to the welding of 5 mm thick austenitic stainless steel plates.
Abstract: The aim of the present study was to investigate the effect of specific oxide fluxes on the surface appearance, weld morphology, retained δ ferrite content, hot cracking susceptibility, angular distortion and mechanical properties obtained with the tungsten inert gas (TIG) process applied to the welding of 5 mm thick austenitic stainless steel plates. An autogenous gas tungsten arc welding process was applied to stainless steels through a thin layer of activating flux to produce a bead on plate welded joint. The MnO2 and ZnO fluxes used were packed in powdered form. The experimental results indicated that the 80% MnO2–20% ZnO mixture can give full penetration and also a satisfactory surface appearance for type 304 stainless steel TIG flux welds. TIG welding with MnO2 and/or ZnO can increase the measured ferrite number in welds, and tends to reduce hot cracking susceptibility in as welded structures. It was also found that TIG flux welding can significantly reduce the angular distortion of stainless...
74 citations
TL;DR: In this article, three welding speeds designated as low (1.5mm/s), medium (2.5 mm/s) and high (3.5 millimeters/sec) were operated during gas tungsten arc welding (GTAW) process and joints made were subjected to analysis of the microstructures, mechanical and corrosion properties of the joints.
74 citations
TL;DR: In this paper, the microstructure, crack sensitivity, and porosity of double-sided arc welding (DSAW) weldments were studied systematically, and it was found that the shape and size of porosity is related to solidification substructure.
Abstract: Due to its popularity and high crack sensitivity, 6061 aluminum alloy was selected as a test material for the newly developed double-sided arc welding (DSAW) process. The microstructure, crack sensitivity, and porosity of DSAW weldments, were studied systematically. The percentage of fine equiaxed grains in the fully penetrated welds is greatly increased. Residual stresses are reduced. Porosity in the welds is reduced and individual pores are smaller. It was also found that the shape and size of porosity is related to solidification substructure. In particular, a weld metal zone with equiaxed grains tends to form small and dispersed porosity, whereas elongated porosity tends to occur in columnar grains.
74 citations
TL;DR: A simple multi-criteria decision-making (MCDM) methodology based on the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method is presented to choose an industrial robot for the arc welding operation and showed that the MCDM approaches for robot selection are quite useful.
74 citations
TL;DR: In this paper, the relationship between abrasive wear resistance and microstructure of a hardfacing alloy based on Fe-Cr-C-Nb system (CNO) was investigated.
Abstract: The relationship between abrasive wear resistance and microstructure of a hardfacing alloy based on Fe–Cr–C–Nb system (CNO) was investigated. This material was developed for cladding, by an open arc welding technique, of components subjected to severe abrasive wear. The work undertaken included microstructural characterization and abrasion testing. Microstructural examinations of hardfaced layer showed that the microstructure of the alloy consisted of a large volume fraction of primary niobium carbides randomly dispersed in a eutectic matrix comprised of metastable austenite (γ) and eutectic M 7 C 3 carbides as well as a high volume fraction of primary M 7 C 3 . Abrasive wear tests, in low stress and high stress, showed that the developed Fe–Cr–C–Nb hardfacing alloy exhibited improved abrasive wear resistance in comparison with the conventional high carbon/high chromium hardfacing alloy with higher hardness and higher volume fraction of primary M 7 C 3. Owing to its better wear resistance and its relatively low cost, the alloy CNO may be a successful replacement of the more conventional hardfacing material for the refurbishment of components subjected to severe abrasive wear in order to extend their service life.
73 citations