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>.

Devendranath Ramkumar K

Department of Manufacturing Engineering

School of Mechanical Engineering

Vellore Campus

Arivazhagan N

Narayanan S

Varma J.L.N

Chaitanya G

Choudhary A

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.

&nbsp;

&nbsp;

VIT University

Materials Science and Engineering: A

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

Journal of Manufacturing Processes

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

This study addressed the use of activated flux SiO2 for the gas tungsten arc (GTA) welding of super-austenitic stainless steel plates of 5 mm thickness. Trials were carried out to investigate the effect of flux and the welding current to determine the depth of penetration. Bead-on-plate trials were carried out on the AISI 904L with and without flux. It was inferred from the macrostructure studies that with a welding current of 180 A, complete penetration could be achieved using flux-assisted GTA welding. The optimal process parameters were validated by conducting the experimental investigations to ascertain the structure–property relationships of flux-assisted GTA weldment. Experimental results corroborated that the average tensile strength and impact toughness of SiO2 flux-assisted GTA weldments of AISI 904L were observed as 553 MPa and 49.3 J. It was inferred from the studies that defect-free welds of super-austenitic stainless steel could be obtained on employing flux-assisted GTA welding process. © 2015, Springer-Verlag London.

The International Journal of Advanced Manufacturing Technology

Experimental investigations on the SiO2 flux-assisted GTA welding of super-austenitic stainless steels

Journal of Materials Research

Studies on the weldability, microstructure and mechanical properties of flux assisted Nd:YAG laser welds of AISI 904L

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.

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

Procedia Materials Science

Effect of Ternary Fluxes on Depth of Penetration in A-TIG Welding of AISI 409 Ferritic Stainless Steel

Soldagem & Inspeção

Characterization of duplex stainless steel weld metals obtained by hybrid plasma-gas metal arc welding

Journal of Nanoscience and Nanotechnology

Comparisons Between TiO2- and SiO2-Flux Assisted TIG Welding Processes

Metallurgical and Materials Transactions B

Effect of Activated Flux on the Microstructure, Mechanical Properties, and Residual Stresses of Modified 9Cr-1Mo Steel Weld Joints

Materials & Design

Effect of shielding gases on microstructure and mechanical properties of super austenitic stainless steel by hybrid welding

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

Journal	Data powered by TypesetMaterials Science and Engineering: A
Publisher	Data powered by TypesetElsevier BV
ISSN	0921-5093
Open Access	0