PSI - Issue 47

ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 47 (2023) 842–848

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons In particular, six specimens, cut from six different single lap joints made with different welding parameters, were equipped with two strain-gauges and subjected to tensile tests. The specimens were manufactured with six different terns of welding parameters: laser power of 3 kW for all joints, welding speed equal to 30 mm/s, 35 mm/s or 40 mm/s and laser beam focus equal to 0 mm or - 3 mm (i.e. half thickness of the joint). Results showed that the tensile properties of the single lap joints were significantly affected by the welding laser focus and that the lower the welding speed, the higher the tensile strength. The analysis of the load strain curves led to the conclusion that the most resistant welded joints were those obtained with a welding speed of 30 mm/s and a surface (i.e., 0 mm) focus of the laser beam. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Keywords: Laser welding; Single-lap joints; Mechanical behaviour; Finite element method 1. Introduction The Laser Beam Welding (LBW) technique has superior performances if compared to traditional welding techniques. As a matter of fact, it allows to obtain reduced Heat-Affected Zone (HAZ) dimensions, reduced distortions, high precision and high speed (Sepe et al. (2021)). For these reasons, LBW technique is appealing for the Abstract Laser welding technique has recently spread quickly thanks to its numerous advantages compared to traditional welding techniques, namely high precision, reduced welding beads size, high speed and possibility to be implemented in mechanical automatization systems. Owing to its superior characteristics and high reliability, laser welding is the preferred choice especially for joints made with titanium alloys, which are widely used for aircraft and aerospace structures. Therefore, the mechanical behavior of Ti6Al4V laser welded joints was investigated in this work. In particular, six specimens, cut from six different single lap joints made with different welding parameters, were equipped with two strain-gauges and subjected to tensile tests. The specimens were manufactured with six different terns of welding parameters: laser power of 3 kW for all joints, welding speed equal to 30 mm/s, 35 mm/s or 40 mm/s and laser beam focus equal to 0 mm or - 3 mm (i.e. half thickness of the joint). Results showed that the tensile properties of the single lap joints were significantly affected by the welding laser focus and that the lower the welding speed, the higher the tensile strength. The analysis of the load strain curves led to the conclusion that the most resistant welded joints were those obtained with a welding speed of 30 mm/s and a surface (i.e., 0 mm) focus of the laser beam. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Keywords: Laser welding; Single-lap joints; Mechanical behaviour; Finite element method 1. Introduction The Laser Beam Welding (LBW) technique has superior performances if compared to traditional welding techniques. As a matter of fact, it allows to obtain reduced Heat-Affected Zone (HAZ) dimensions, reduced distortions, high precision and high speed (Sepe et al. (2021)). For these reasons, LBW technique is appealing for the 27th International Conference on Fracture and Structural Integrity (IGF27) Mechanical Behavior of Ti6Al4V Laser Welded Single Lap Joints A. Califano a *, V. Giannella a , F. Caiazzo a , F. Berto c , R. Sepe a a University of Salerno, Department of Industrial Engineering, Via Giovanni Paolo II, 132, 84084, Fisciano (SA), Italy b “La Sapienza” University of Rome, Department of Chemical Engineering Materials Environment, Via Eudossiana, 18, 00184 Roma, Italy Abstract Laser welding technique has recently spread quickly thanks to its numerous advantages compared to traditional welding techniques, namely high precision, reduced welding beads size, high speed and possibility to be implemented in mechanical automatization systems. Owing to its superior characteristics and high reliability, laser welding is the preferred choice especially for joints made with titanium alloys, which are widely used for aircraft and aerospace structures. Therefore, the mechanical behavior of Ti6Al4V laser welded joints was investigated in this work. 27th International Conference on Fracture and Structural Integrity (IGF27) Mechanical Behavior of Ti6Al4V Laser Welded Single Lap Joints A. Califano a *, V. Giannella a , F. Caiazzo a , F. Berto c , R. Sepe a a University of Salerno, Department of Industrial Engineering, Via Giovanni Paolo II, 132, 84084, Fisciano (SA), Italy b “La Sapienza” University of Rome, Department of Chemical Engineering Materials Environment, Via Eudossiana, 18, 00184 Roma, Italy

* Corresponding author. Tel.: +39-389-964-070. E-mail address: amcalifano@unisa.it * Corresponding author. Tel.: +39-389-964-070. E-mail address: amcalifano@unisa.it

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons 10.1016/j.prostr.2023.07.035