Influence of Keyhole Mode of Plasma Arc Welding on Microstructure and Mechanical Properties of Similar Butt-Welded Incoloy 800H

The keyhole mode of plasma arc welding (K-PAW) was employed to weld Incoloy 800H plates of 6 mm thickness. A nickel–chromium-based superalloy, Incoloy 800H is a fully austenitic face-centered cubic structure and imparts better tensile strength, fatigue strength, and creep properties at higher temper...

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Bibliographic Details
Published in:Arabian journal for science and engineering (2011) 2020-02, Vol.45 (2), p.1135-1142
Main Authors: Harish, T. M., Jerome, S., Yadukrishna, B., Kumar, Rishi S., Midhun Suresh, C., Ramesh, Krishnakanth
Format: Article
Language:English
Subjects:
Butt welding
Chromium plating
Creep (materials)
Crystal defects
Dendritic structure
Engineering
Fatigue strength
Ferrous alloys
Fracture mechanics
Grain structure
Humanities and Social Sciences
Mechanical properties
Microstructure
multidisciplinary
Nickel
Nickel base alloys
Norms
Plasma arc welding
Pressure vessels
Radiography
Research Article - Mechanical Engineering
Science
Solidification
Superalloys
Temperature gradients
Tensile strength
Weldments
X-ray radiography
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Summary:The keyhole mode of plasma arc welding (K-PAW) was employed to weld Incoloy 800H plates of 6 mm thickness. A nickel–chromium-based superalloy, Incoloy 800H is a fully austenitic face-centered cubic structure and imparts better tensile strength, fatigue strength, and creep properties at higher temperatures. Full-penetration weld was achieved by a single-pass welding, and no defects were observed in X-ray radiography testing. Microstructural studies revealed fine equiaxed dendritic structure present in the weld metals due to the steep temperature gradient induced by the K-PAW. Due to fine grain structure, no solidification cracking was observed in the weldment. Mechanical properties studies confirmed that weldments attained the minimal requirements of tensile strength, hardness, ductility, and toughness as per the boiler pressure vessel fabrication requirement norms.
ISSN:2193-567X
1319-8025
2191-4281
DOI:10.1007/s13369-019-04240-8