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

Applied Sciences

Filippo Berto¹  Paolo Ferro²  Suresh Akella³  A. C. Uma Maheshwer Rao³  Harinadh Vemanaboina⁴  Edison Gundabattini⁵  Ramesh Kumar Buddu⁶ 

[1] Department of Engineering Design and Materials, Norwegian University of Science and Technology, 7491 Trondheim, Norway;Department of Engineering and Management, University of Padua, Stradella San Nicola, 36100 Vicenza, Italy;Department of Mechanical Engineering, Sreyas Institute of Engineering & Technology, Hyderabad 500068, India;Department of Mechanical Engineering, Sri Venkateswara College of Engineering and Technology (Autonomous), Chittoor 517127, India;Department of Thermal and Energy Engineering, School of Mechanical Engineering, Vellore Institute of Technology (VIT), Vellore 632014, India;Institute for Plasma Research, Gandhinagar 382428, India;

关键词: laser beam welding;    radiography;    tensile strength;    residual stress;    microstructure;   

DOI  :  10.3390/app11157002

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown