An attempt is made to reduce the residual stresses by means of vibratory stress relief (VSR) by using an electromagnetic exciter. This paper examines the residual stresses induced in a CO2 laser welded AISI 316 austenitic stainless-steel plates. In this paper, a new approach of reliving stresses has been discussed using an electromagnetic exciter which is easy to apply and overcomes some of the limitations that other VSR procedures currently have. Various tests such as tensile test, impact test, micro- hardness test, and micro-resistivity test were conducted to validate the effectiveness of the residual stress reduction. The residual stress was relived from the AISI 316 welded plates with an average magnitude of 100 MPa. © 2017 Elsevier B.V.

Arivarasu M

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

Arivazhagan N

Department of Manufacturing Engineering

Mohanty S

Phani Prabhakar K.V.

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

Materials Science and Engineering: A

This research article focuses on the joining of SMO 254 stainless steel by autogenous CO2 Laser beam welding and pulsed current gas tungsten arc welding (PCGTAW) with ERNiCrMo3 filler. The studies proved that full penetration could be achieved on the weld joint of a 5 mm thick plate with a reduced heat input of 120 J/mm in the laser welding while in the case of PCGTAW it was 3032 J/mm. An attempt is made to do a comparative evaluation of the microstructure changes which have occurred owing to welding and thereby the mechanical properties. The studies revealed the lack of deleterious phases in both welding techniques. Presence of grain boundary thickening near the fusion zone and elemental segregation was observed in PCGTAW joints. The residual stress measurements by X-ray diffraction method were executed over the cross-section of the two different weldments. An attempt is made to represent the stresses variation along the weld region, heat affected zone and the base metal graphically. The tensile test validated that in every case the rupture ensued at the base metal and the higher weldment hardness than base metal proves the soundness of the joint. © 2019 The Society of Manufacturing Engineers

Journal of Manufacturing Processes

Investigations on induced residual stresses, mechanical and metallurgical properties of CO2 laser beam and pulse current gas tungsten arc welded SMO 254

In the research work, an attempt is made to join nickel-based alloy 825 by employing CO2 laser beam welding. Successful full penetration weld joint of a 5 mm thick plate is achieved with a very low heat input of 120 J-mm−1. Narrow weld bead width of 0.6 mm at the root and 1.6 mm at the cap is observed fusion zone; the interface and base metal microstructures have been examined using both optical and scanning electron microscopic techniques to understand the microstructural changes which have occurred due to laser welding. A range of tests of Vickers micro hardness, tensile and impact tests had been performed on the weldment to ascertain the mechanical properties of the joint. Tensile failure at the base metal and a 180° root bend test conducted on the weldment ascertain the soundness of the weld joint produced. An attempt is made to correlate the microstructure and mechanical properties of the weldment. Intermetallics TiN and Al4C3 observed in the SEM\EDS analysis at the fusion zone are found to have improved the weld metal strength and hardness. © 2017 Canadian Institute of Mining, Metallurgy and Petroleum.

Canadian Metallurgical Quarterly

Investigations on metallurgical and mechanical properties of CO2 laser beam welded Alloy 825

In this work, the microstructural character of dissimilar welds between Incoloy 800H and 321 Stainless Steel has been discussed. The microscopic examination of the base metals, fusion zones and interfaces was characterized using an optical microscope and scanning electron microscopy. The results revealed precipitates of Ti (C, N) in the austenitic matrix along the grain boundaries of the base metals. Migration of grain boundaries in the Inconel 82 weld metal was very extensive when compared to Inconel 617 weldment. Epitaxial growth was observed in the 617 weldment which increases the strength and ductility of the weld metal. Unmixed zone near the fusion line between 321 Stainless Steel and Inconel 82 weld metal was identified. From the results, it has been concluded that Inconel 617 filler metal is a preferable choice for the joint between Incoloy 800H and 321 Stainless Steel. © 2015 Elsevier Inc.

Materials Characterization

Microstructural characterization of dissimilar welds between Incoloy 800H and 321 Austenitic Stainless Steel

Journal of Materials Engineering and Performance

Effect of Continuous and Pulsed Current Gas Tungsten Arc Welding on Dissimilar Weldments Between Hastelloy C-276/AISI 321 Austenitic Stainless Steel

Engineering

Improving Laser Beam Welding Efficiency

Advanced Materials Research

Study on Joint Residual Stress Induced by Laser Beam Welding of High Strength Automobile Thin Sheet

The residual stress distribution of CO2 laser beam welded AISI 316 austenitic stainless steel and the effect of vibratory stress relief

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