Browsing by Author "Paulraj, P."

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    Impact Energy Estimation of AISI304L/AA6063 Alloys Dissimilar Friction Welds Influenced by Various New Faying Surfaces: A Comparative Study
    (Springer, 2024) Senthil Murugan, S.S.; Paulraj, P.; Kattimani, S.
    This research paper delves into an innovative approach for enhancing the faying surfaces in the rotary friction welding process. This study evaluates the impact energy in Joule (J) of friction-welded joints (FWJs) between dissimilar cylindrical rods made of AA6063 wrought aluminium and AISI304L austenitic stainless steel focusing on the influence of various faying surface designs and welding parameters. Additionally, the study conducts an in-depth analysis of various faying surface designs. A series of experiments were conducted using a Charpy V-notch tester to analyse 45 different FWJs with diverse surface modifications. Welding conditions such as friction pressure (FP), friction time, and upset pressure were varied to assess their effects on joint toughness. The aim was to utilize the low FP, spanning from 1.2 to 1.8 MPa, in the pursuit of optimizing the welding process. The results revealed notable variations in the impact energy values of FWJs in response to changes in both the faying surfaces of the specimens and the welding parameters. A5 trial achieved the highest impact energy at 38 J. Notably, joints with hemispherical faying surfaces exhibited enhanced toughness, with method N achieving 26 J. Adjustments to the faying surface design and welding conditions had a substantial impact on the toughness and energy absorption of the welded joints. © The Institution of Engineers (India) 2024.
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    Multi-objective optimization of friction welding parameters in AISI 304L austenitic stainless steel and copper joints
    (SAGE Publications Ltd info@sagepub.co.uk, 2016) Shanjeevi, C.; Kumar, S.S.; Paulraj, P.
    Friction welding is a solid-state joining technique, and joining of dissimilar materials has been witnessing tremendous development in various applications. In this study, friction welding is carried out in dissimilar materials, austenitic stainless steel and copper, which find application in power generators. The parameters such as friction pressure, upset pressure, rotational speed and burn-off length are considered to determine its influence on tensile strength, metal loss and weld time. Taguchi's L27 orthogonal array is used for experimental design to maximize the tensile strength as well as minimize the metal loss and weld time. Optimal parameters are determined through multiple performance characteristics, and it is found that friction pressure of 22 MPa, upset pressure of 108 MPa, rotational speed of 500 r/min and burn-off length of 1mm yield good mechanical and metallurgical properties. © IMechE 2014.