Detecting beam offsets in laser welding of closed-square-butt joints by wavelet analysis of an optical process signal

Elefante, Arianna; Nilsen, Morgan; Sikström, Fredrik; Christiansson, Anna-Karin; Maggipinto, T.; Ancona, Antonio

doi:10.1016/j.optlastec.2018.08.006

Cited by 19 publications

(9 citation statements)

References 17 publications

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“…Because the properties of the two materials differed, it was necessary to optimize welding [19]. The initial welding conditions were established by xing the focal position and welding speed and then varying the laser output.…”

Section: Bop and Lap Joint Welding Conditionsmentioning

confidence: 99%

Characterization of dissimilar aluminum-copper material joining by controlled dual laser beam

Choi

2021

Int J Adv Manuf Technol

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Laser technology has many advantages in welding for the manufacture of EV battery packs. Aluminum (Al) and copper (Cu) are welded using a dual laser beam, suggesting the optimum power distribution for the core and ring beams. Due to the very high re ectance of Cu and Al exposed to near-infrared lasers, the material absorbs a very small amount of energy. Compared to single beam laser welding, dual beam welding has signi cantly improved surface quality by controlling surface solidi cation. The study focused on the quality of weld surface beads, weld properties and tensile strength by varying the output ratio of the core beam to the ring beam. Optimal conditions of Al6061 were a 700 W core beam, a 500 W ring beam and 200 mm/s of weld speed. For the C1020P, the optimum conditions were a center beam of 2500 W, a ring beam of 3000 W and a welding speed of 200 mm/s. In laser lap welding of Al-Al and Al-Cu, the bead width and the interfacial bead width of the joint increased as the output increased. The penetration depth did not change signi cantly, but small pores were formed at the interface of the junction. Tensile tests were performed to demonstrate the reliability of the weld zone, and computer simulations provided analysis of the heat distribution for optimal heat input conditions.

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Section: Bop and Lap Joint Welding Conditionsmentioning

confidence: 99%

Characterization of dissimilar aluminum-copper material joining by controlled dual laser beam

Choi

2021

Int J Adv Manuf Technol

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“…This dependence is due to the influence on inclusion of alloying elements in the weld zone due to change in position of the beam relative to the weld centerline. The actual offset of the beam in welding is usually not straightforward and requires a feedback loop (photodetector in the case of LBW) for detecting position of the beam [57].…”

Section: Influence Of Beam Offsettingmentioning

confidence: 99%

Influence of welding process on the properties of dissimilar titanium alloy weldments: a review

Junaid

Cheema

2020

JMST Adv.

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The extensive use of titanium alloys in a variety of complex industrial applications may be attributed to their properties of high strength-to-weight ratio, corrosion resistance and high temperature strength. Recently, the use of dissimilar titanium alloys has become popular to achieve contrasting characteristics in a single unit. In the fabrication of the structures, joining methods such as welding hold the key in the attainment of the desired characteristics. The present study is aimed at reviewing various state-of-the-art processes used for welding of dissimilar titanium alloys. In particular, the influence of different welding methods such as gas tungsten arc welding (GTAW), laser and electron beam welding on the microstructure, mechanical properties and other characteristics of dissimilar weldments of α, α + β and β titanium alloys has been emphasized. The underlying phenomena that govern the effect of weld processing parameters on the mechanical strength, microstructure and weld joint quality of the alloys were exploited. Moreover, detailed investigations on the fusion zone porosities and evolution of intermetallic concept at the interfacial regions have been examined. Furthermore, different remedial approaches to enhance the joint quality such as beam offsetting, process hybridization, aging and post-weld heat treatments are investigated thoroughly. The latest trends in dissimilar welding of titanium alloys to upheave further research in this area have been reported in the context of their application in industrial applications.

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“…The merit of the WPT is firmly grounded in its ability to present a holistic and in-depth portrayal of a signal. By accommodating varied scales and frequencies, the WPT meticulously captures multifaceted information, thereby enriching the signal representation [12].…”

Section: Introductionmentioning

confidence: 99%

Optimized Wavelet and Wavelet Packet Transform Techniques for Assessing Crack Behavior in Curved Segments of Arched Beam Bridges Spanning Rivers

Chen,

Lu,

Deng

et al. 2023

Water

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Our study focuses on the dynamic transient analysis of arched beam bridges over rivers, which face unique geohazards and challenges, including vibrations and dynamic loads that can affect structural integrity. The finite element software ANSYS v. 19.3 was employed to assess acceleration time histories at various bridge positions. Using MATLAB, we conducted wavelet packet decomposition to extract insights from the data, specifically isolating river-induced influences. In this article, the introduction of the wavelet packet rate index (WPERI) is presented as a novel metric for the detection of cracks in the curved bridge segments over rivers. The WPERI proves reliable in accounting for the river environment’s impact on structural integrity. Our findings highlight the sensitivity and precision of the WPERI in accurately detecting cracks and vulnerabilities in these riverine bridges. By combining WPT, finite element analysis, and signal decomposition, our research offers insights into tailored crack detection methods for riverine bridges. This study underscores the potential of WPT as a tool for identifying and characterizing cracks in curved bridge elements over rivers. The innovative WPERI provides a holistic approach to addressing structural issues, thus enhancing bridge durability amid changing environmental conditions. It contributes significantly to structural engineering and paves the way for the further exploration of river-specific crack detection techniques.

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Detecting beam offsets in laser welding of closed-square-butt joints by wavelet analysis of an optical process signal

Cited by 19 publications

References 17 publications

Characterization of dissimilar aluminum-copper material joining by controlled dual laser beam

Characterization of dissimilar aluminum-copper material joining by controlled dual laser beam

Influence of welding process on the properties of dissimilar titanium alloy weldments: a review

Optimized Wavelet and Wavelet Packet Transform Techniques for Assessing Crack Behavior in Curved Segments of Arched Beam Bridges Spanning Rivers

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