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Volume 11
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10.3390/app11157002
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Article

Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints

by
Harinadh Vemanaboina
1,*,
Edison Gundabattini
2,
Suresh Akella
3,
A. C. Uma Maheshwer Rao
3,
Ramesh Kumar Buddu
4,
Paolo Ferro
5,* and
Filippo Berto
6
1
Department of Mechanical Engineering, Sri Venkateswara College of Engineering and Technology (Autonomous), Chittoor 517127, India
2
Department of Thermal and Energy Engineering, School of Mechanical Engineering, Vellore Institute of Technology (VIT), Vellore 632014, India
3
Department of Mechanical Engineering, Sreyas Institute of Engineering & Technology, Hyderabad 500068, India
4
Institute for Plasma Research, Gandhinagar 382428, India
5
Department of Engineering and Management, University of Padua, Stradella San Nicola, 36100 Vicenza, Italy
6
Department of Engineering Design and Materials, Norwegian University of Science and Technology, 7491 Trondheim, Norway
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2021, 11(15), 7002; https://doi.org/10.3390/app11157002
Submission received: 25 May 2021 / Revised: 15 July 2021 / Accepted: 26 July 2021 / Published: 29 July 2021
(This article belongs to the Special Issue Fracture and Fatigue Assessments of Structural Components Ⅱ)
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Abstract

In the frame of the circular economy, welding of Ni-based superalloys has gained increasing importance when applied, for instance, to repairing highly expensive components widely used in strategical sectors, such as the defense and aerospace industries. However, correct process parameters avoiding metallurgical defects and premature failures need to be known. To reach this goal, Inconel 625 butt-welded joints were produced by CO2 laser beam welding and different combinations of process parameters. The experimental investigation was carried out with three parameters in two levels with an L4 orthogonal array. Laser power, welding speed, and shielding gas flow rate were varied, and the results were reported in terms of mechanical properties, such as microhardness, tensile strength, distortion, residual stress, and weld bead geometry, and metallurgy. At a lower welding speed of 1 m/min, the full penetration was observed for 3.0 kW and 3.3 kW laser powers. However, sound welds (porosity-free) were produced with a laser power of 3.3 kW. Overall, the obtained full-penetration specimens showed a tensile strength comparable with that of the parent material with residual stresses and distortions increasing with the increase in heat input.
Keywords: laser beam welding; radiography; tensile strength; residual stress; microstructure laser beam welding; radiography; tensile strength; residual stress; microstructure

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MDPI and ACS Style

Vemanaboina, H.; Gundabattini, E.; Akella, S.; Rao, A.C.U.M.; Buddu, R.K.; Ferro, P.; Berto, F. Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints. Appl. Sci. 2021, 11, 7002. https://doi.org/10.3390/app11157002

AMA Style

Vemanaboina H, Gundabattini E, Akella S, Rao ACUM, Buddu RK, Ferro P, Berto F. Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints. Applied Sciences. 2021; 11(15):7002. https://doi.org/10.3390/app11157002

Chicago/Turabian Style

Vemanaboina, Harinadh, Edison Gundabattini, Suresh Akella, A. C. Uma Maheshwer Rao, Ramesh Kumar Buddu, Paolo Ferro, and Filippo Berto. 2021. "Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints" Applied Sciences 11, no. 15: 7002. https://doi.org/10.3390/app11157002

APA Style

Vemanaboina, H., Gundabattini, E., Akella, S., Rao, A. C. U. M., Buddu, R. K., Ferro, P., & Berto, F. (2021). Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints. Applied Sciences, 11(15), 7002. https://doi.org/10.3390/app11157002

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