Assessment of Microstructure and Tensile Behavior of Hot Wire Gas Tungsten Arc Welded Pure Nickel Tubes

The interest in hot wire gas tungsten arc welding (HWGTAW) process is increasing in industrial sector in the current decade. Pure nickel (Ni 200) tubes having 4-mm-thickness and 44-mm-outer diameter were effectively joined by HWGTAW. The heating current of the filler wire was varied from 80 amps to...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2021-02, Vol.74 (2), p.355-368
Main Authors: Pravin Tamil Selvan, C., Kalaiselvan, K., Dinaharan, I., Palanivel, R.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Corrosion and Coatings
Cracks
Diameters
Electron backscatter diffraction
Gas tungsten arc welding
Grain structure
Heating
Materials Science
Metallic Materials
Microstructure
Nickel
Optical microscopes
Original Article
Tensile strength
Tribology
Tubes
Welded joints
Wire
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Summary:The interest in hot wire gas tungsten arc welding (HWGTAW) process is increasing in industrial sector in the current decade. Pure nickel (Ni 200) tubes having 4-mm-thickness and 44-mm-outer diameter were effectively joined by HWGTAW. The heating current of the filler wire was varied from 80 amps to 120 amps in steps of 10 amps. The joint microstructure was recorded using conventional optical microscope and advanced transmission electron microscope. Electron backscatter diffraction was applied to visualize the grain structure and orientation. The increase in heating current enlarged the fusion zone geometry and caused coarsening of grains. There were no cracks or pores present in the joints. Three kinds of microstructure zones were observed across the joints. Few dislocations were formed in the fusion zone which recorded the lowest hardness. All joints demonstrated excellent ductility. The joint fabricated using a heating current of 100 amps showed highest tensile strength.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-020-02130-4