Mechanical and Metallurgical Properties of CO<sub>2</sub> Laser Beam INCONEL 625 Welded Joints
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 m...
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MDPI AG
2021-07-01
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| Online Access: | https://www.mdpi.com/2076-3417/11/15/7002 |
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| author | Harinadh Vemanaboina Edison Gundabattini Suresh Akella A. C. Uma Maheshwer Rao Ramesh Kumar Buddu Paolo Ferro Filippo Berto |
| author_facet | Harinadh Vemanaboina Edison Gundabattini Suresh Akella A. C. Uma Maheshwer Rao Ramesh Kumar Buddu Paolo Ferro Filippo Berto |
| author_sort | Harinadh Vemanaboina |
| collection | DOAJ |
| description | 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 CO<sub>2</sub> laser beam welding and different combinations of process parameters. The experimental investigation was carried out with three parameters in two levels with an L<sub>4</sub> 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. |
| first_indexed | 2024-03-10T09:19:14Z |
| format | Article |
| id | doaj.art-d6e7606adff24357a6b7f558016b6cbe |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T09:19:14Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-d6e7606adff24357a6b7f558016b6cbe2023-11-22T05:22:55ZengMDPI AGApplied Sciences2076-34172021-07-011115700210.3390/app11157002Mechanical and Metallurgical Properties of CO<sub>2</sub> Laser Beam INCONEL 625 Welded JointsHarinadh Vemanaboina0Edison Gundabattini1Suresh Akella2A. C. Uma Maheshwer Rao3Ramesh Kumar Buddu4Paolo Ferro5Filippo Berto6Department of Mechanical Engineering, Sri Venkateswara College of Engineering and Technology (Autonomous), Chittoor 517127, IndiaDepartment of Thermal and Energy Engineering, School of Mechanical Engineering, Vellore Institute of Technology (VIT), Vellore 632014, IndiaDepartment of Mechanical Engineering, Sreyas Institute of Engineering & Technology, Hyderabad 500068, IndiaDepartment of Mechanical Engineering, Sreyas Institute of Engineering & Technology, Hyderabad 500068, IndiaInstitute for Plasma Research, Gandhinagar 382428, IndiaDepartment of Engineering and Management, University of Padua, Stradella San Nicola, 36100 Vicenza, ItalyDepartment of Engineering Design and Materials, Norwegian University of Science and Technology, 7491 Trondheim, NorwayIn 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 CO<sub>2</sub> laser beam welding and different combinations of process parameters. The experimental investigation was carried out with three parameters in two levels with an L<sub>4</sub> 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.https://www.mdpi.com/2076-3417/11/15/7002laser beam weldingradiographytensile strengthresidual stressmicrostructure |
| spellingShingle | Harinadh Vemanaboina Edison Gundabattini Suresh Akella A. C. Uma Maheshwer Rao Ramesh Kumar Buddu Paolo Ferro Filippo Berto Mechanical and Metallurgical Properties of CO<sub>2</sub> Laser Beam INCONEL 625 Welded Joints Applied Sciences laser beam welding radiography tensile strength residual stress microstructure |
| title | Mechanical and Metallurgical Properties of CO<sub>2</sub> Laser Beam INCONEL 625 Welded Joints |
| title_full | Mechanical and Metallurgical Properties of CO<sub>2</sub> Laser Beam INCONEL 625 Welded Joints |
| title_fullStr | Mechanical and Metallurgical Properties of CO<sub>2</sub> Laser Beam INCONEL 625 Welded Joints |
| title_full_unstemmed | Mechanical and Metallurgical Properties of CO<sub>2</sub> Laser Beam INCONEL 625 Welded Joints |
| title_short | Mechanical and Metallurgical Properties of CO<sub>2</sub> Laser Beam INCONEL 625 Welded Joints |
| title_sort | mechanical and metallurgical properties of co sub 2 sub laser beam inconel 625 welded joints |
| topic | laser beam welding radiography tensile strength residual stress microstructure |
| url | https://www.mdpi.com/2076-3417/11/15/7002 |
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