This research study aims at investigating the weldability of ferritic stainless steel, AISI 430 by tungsten inert gas (TIG) welding technique with and without the use of activated fluxes. In the Activated flux TIG (A-TIG) welding process, two different fluxes SiO2 and Fe2O3 have been used to compare the geometric and metallurgical characteristics of the weld beads of AISI 430. It was inferred from the bead on studies that the depth of penetration and the bead width varies with varying the welding current. Microstructure studies depicted the presence of two phase structure containing ferrite-intergranular martensite and the precipitate-free zone surrounding the grain boundary martensite at the fusion zone of all the weldments. Tensile failures were observed at the parent metal of AISI 430 without flux addition and while employing SiO2 flux; whereas at the fusion zone for Fe2O3 flux assisted weldments. A detailed structure-property relationship of the weldments with and without flux additions are elaborated in the present study. © 2015 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.

Devendranath Ramkumar K

Department of Manufacturing Engineering

School of Mechanical Engineering

Vellore Campus

Arivazhagan N

Chandrasekhar A

Singh A.K

Ahuja S

Agarwal A

Rabel A.M.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Journal of Manufacturing Processes

In the present study, a binary component flux (50% SiO2 + 50% MoO3) has been used to join 6.67 mm thick plates of Nb stabilized austenitic stainless steel AISI 347, using activated flux tungsten inert gas (A-TIG) welding. Trials were performed to investigate the effect of the flux and the welding current on the depth of penetration of AISI 347. Microstructure studies revealed the formation of very fine, intimate skeletal delta ferrite along the centreline of the AISI 347 welds. It was corroborated from the tensile studies that the fracture had been experienced at the fusion zone of the ATIG weldments. The joint efficiency of ATIG welds of AISI 347 was ascertained to be 83.5% in the as-welded conditions. In the unpeened condition, the tensile stresses were predominated in the fusion zone. Low energy, double sided laser shock peening was carried out at the fusion zone of the ATIG weldments by varying pulse densities. There was a slight increment in the tensile properties, while varying the pulse densities. Furthermore, the trials were conducted by varying the number of shots for the optimal pulse density. The studies envisaged that on increasing the number of shots for a pulse density of 5000 pulses/cm2, the yield and tensile strength improve considerably by 11.8%, due to the accrued residual compressive stresses. X-ray diffraction sin2ψ method is employed to compute the residual stresses in the fusion zones to correlate the mechanical properties. It is attested from the present studies that the filler-less ATIG welding along with laser shock peening resulted in better mechanical properties. © 2017 The Society of Manufacturing Engineers

Effect of pulse density and the number of shots on hardness and tensile strength of laser shock peened, activated flux TIG welds of AISI 347

In the present study, three different fluxes namely NiO, MoO3 and SiO2 were employed to investigate the weldability of super-duplex stainless steel (UNS S32750). Bead on trial studies were conducted to determine the effect of welding current on the depth of penetration and depth to width (D/W) ratio. The studies demonstrated that complete penetration could be achieved in a single pass with the use of activated flux. Microstructure studies showed the formation of coarser grains of ferrite along with three different types of austenite which are Widmanstätten, intra-granular and grain boundary austenite in the fusion zones of all the weldments. Oxygen content and ferrite count analysis were also carried out at the fusion zones of the weldments. Tensile studies inferred that the tensile failures occurred at the weld zone for all the cases. The joint efficiencies of the activated flux tungsten inert gas (A-TIG) weldments employing NiO, MoO3 and SiO2 flux were reported to be 91.6%, 87.4% and 93.06%, respectively. The impact toughness of the A-TIG weldments was found to be lower than that of the base metal (82 J). Potentiodynamic polarization studies were also performed to investigate the corrosion behaviour of the welds in 3.5% NaCl environment. © 2016 The Society of Manufacturing Engineers

Studies on the structure–property relationships and corrosion behaviour of the activated flux TIG welding of UNS S32750

This study addresses the comparison of metallurgical and mechanical properties of autogeneous and activated compound flux assisted gas <a href="https://www.sciencedirect.com/topics/materials-science/tungsten">tungsten</a> <a href="https://www.sciencedirect.com/topics/materials-science/arc-welding">arc welding</a> (GTAW) of super-austenitic stainless steel, AISI 904L. The use of compound flux containing 85% SiO2–15% TiO2 acquainted for better depth of penetration compared to autogeneous welding. Segregation of Mo rich phases was witnessed in the fusion zone of flux assisted AISI 904L. Tensile studies showed that the fracture occurred at the fusion zone for both the weldments. Ductility was found to be greater for the flux-assisted weldments. The present study also investigates the structure–property relationships of AISI 904L weldments using the combined techniques of optical and <a href="https://www.sciencedirect.com/topics/materials-science/scanning-electron-microscopy">scanning electron microscopy</a>.

Materials Science and Engineering: A

Effect of autogeneous GTA welding with and without flux addition on the microstructure and mechanical properties of AISI 904L joints

Journal of Materials Engineering and Performance

Welding of 316L Austenitic Stainless Steel with Activated Tungsten Inert Gas Process

Materials & Design (1980-2015)

Resistance spot welding of AISI 430 ferritic stainless steel: Phase transformations and mechanical properties

Materials & Design

The effect of gas tungsten arc welding and pulsed-gas tungsten arc welding processes’ parameters on the heat affected zone-softening behavior of strain-hardened Al–6.7Mg alloy

Journal of Materials Science & Technology

Principles Giving High Penetration under the Double Shielded TIG Process

Comparative studies on the weldability, microstructure and tensile properties of autogeneous TIG welded AISI 430 ferritic stainless steel with and without flux

Journal	Data powered by TypesetJournal of Manufacturing Processes
Publisher	Data powered by TypesetElsevier BV
ISSN	1526-6125
Open Access	No