Activated TIG welding of AISI 304L using mono- and tri-component fluxes
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A-TIG welding employs a thin flux layer coated on the surface area to be welded. The flux can be like oxides, chlorides, and/or fluorides. A-TIG welding improves the productivity by enhancing the depth of penetration (DoP) significantly by arc constriction and/or by reversal of Marangoni force. Autogenous Activated-TIG welding employing two monocomponent fluxes viz., SiO2 and TiO2, and tricomponent fluxes comprising SiO2, TiO2, and Cr2O3 was performed to study their effect on the bead profile of the welds of AISI 304 L. The results were analyzed using Minitab 16 software, and a regression equation giving the effect of composition of the tricomponent fluxes on the DoP was developed. Through optimization, a flux composition to yield the maximum DoP was identified. Results of this study showed that the arc constriction was the dominant mechanism causing the improvement in the penetration. With the optimized flux 82 % raise in DoP was achieved.
KeywordsA-TIG welding 304 L Stainless steel Depth of penetration Monocomponent flux Tricomponent flux
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