Effect of heat input on the mechanical and metallurgical characteristics of TIG welded joints / subhas Chandra Moi...[et al.]

Subhas, Chandra Moi and Pradip, Kumar Pal and Asish, Bandyopadhyay and Ramesh, Rudrapati (2019) Effect of heat input on the mechanical and metallurgical characteristics of TIG welded joints / subhas Chandra Moi...[et al.]. Journal of Mechanical Engineering (JMechE), 16 (2). pp. 29-40. ISSN 1823-5514 ; 2550-164X


This paper presents the study of effect of heat input on the joint quality of tungsten inert gas (TIG) welded specimens. Three different heat input combinations selected as low heat (0.75kJ/mm), medium heat (0.90kJ/mm) and high heat (1.05kJ/mm) have been applied during the operation of TIG welding process on 316L austenitic stainless steel. Welded joints being prepared using a semiautomatic TIG welding machine, the effect of heat input is investigated on the weld bead geometry and mechanical-metallurgical characteristics of the joints. It is observed that as heat input increases, the width of weld bead increases, where as height of weld bead decreases with increasing heat input. Tensile strength as well as hardness increases with increase of heat input up to a threshold value and thereafter it start decreasing. The results of the investigation indicate that the joint prepared using medium heat input depicts higher tensile strength, percentage elongation, yield strength and higher micro hardness value than those joints made using low and high heat input due to smaller dendrite size and lesser interdendritic spacing in the weld zone and formation of very fine skeletal δ-ferrite in plain austenitic matrix. A large number of very fine and shallow dimples are observed in SEM fractograph of the joint made using medium heat input.


Item Type: Article
Email / ID Num.
Subhas, Chandra Moi
Pradip, Kumar Pal
Asish, Bandyopadhyay
Ramesh, Rudrapati
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Universiti Teknologi MARA, Shah Alam > Faculty of Mechanical Engineering
Journal or Publication Title: Journal of Mechanical Engineering (JMechE)
UiTM Journal Collections: UiTM Journal > Journal of Mechanical Engineering (JMechE)
ISSN: 1823-5514 ; 2550-164X
Volume: 16
Number: 2
Page Range: pp. 29-40
Keywords: Tungsten Inert Gas Welding, Heat Input, Weld Bead Geometry, Microstructure, Tensile Strength
Date: 2019
URI: https://ir.uitm.edu.my/id/eprint/36413
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