Blue laser welding of multi-layered AISI 316L stainless steel micro-foils

Das, Abhishek; Fritz, R.; Finuf, Mathew; Masters, Iain

doi:10.1016/j.optlastec.2020.106498

Cited by 33 publications

(10 citation statements)

References 29 publications

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“…An increased penetration into the arrester tab correlated with higher mechanical seam strength. DAS et al made similar observations for welding steel foils [39].…”

Section: Characteristics Of the Mechanical Strengthsmentioning

confidence: 61%

Laser welding of current collector foil stacks in battery production–mechanical properties of joints welded with a green high-power disk laser

Grabmann

Kriegler

Harst

et al. 2021

Int J Adv Manuf Technol

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The qualification of production systems that enable reliable and stable production processes is a major challenge in manufacturing large-format lithium-ion batteries. During cell assembly, the electrode sheets of the anode and the cathode are stacked, and are electrically contacted by a welding process. It was shown that laser beam welding employing a beam source in the green wavelength range is a promising joining approach in terms of high productivity. Therefore, the influence of the process parameters, such as the laser power, the welding speed, the pulse frequency, and the pulse duration, on the weld seam quality was investigated. Particular emphasis was placed on the mechanical strength of the weld seam. Statistically planned experiments were used to determine feasible parameter sets for welding the most common current collectors of lithium-ion battery electrodes, copper (Cu), and aluminum (Al). The influence of the individual process parameters on the tensile shear force was evaluated. Stacks of 40 metal foils were welded with a thin metal sheet in lap joint configuration. Based on an analysis of the requirements for minimum mechanical seam strengths, this study confirms that laser beam welding using a green high-power disk source is an auspicious process for the internal contacting of lithium-ion batteries.

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“…An increased penetration into the arrester tab correlated with higher mechanical seam strength. DAS et al made similar observations for welding steel foils [39].…”

Section: Characteristics Of the Mechanical Strengthsmentioning

confidence: 61%

Laser welding of current collector foil stacks in battery production–mechanical properties of joints welded with a green high-power disk laser

Grabmann

Kriegler

Harst

et al. 2021

Int J Adv Manuf Technol

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“…Green laser beam sources are particularly advantageous for welding copper plates. Optimisation and finding the right parameters are still the basis of a considerable amount of research [8][9][10][11][12][13][14][15][16][17].…”

Section: State Of the Artmentioning

confidence: 99%

Investigation of nickel coated steel tapes welded joints

Hareancz

Sinka

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Nickel-plated steel tapes are primarily developed for battery production. The aim of these developments was to provide all battery cell cases with good contact resistance and high corrosion resistance, thus increasing their durability. When individual battery cells are packaged, the electrical connection is also mostly made with nickel-plated plates. Welding and soldering are the bonding technologies used to make the connections between the plates, but the advantages mentioned above may vary when making these connections. To our knowledge, lasers with diode beam sources are the most efficient and are becoming more and more suitable for a wide range of applications as the technology develops. The aim of our investigations is to investigate the quality of joints made with low power diode lasers with different parameters from a strength and metallographic point of view.

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“…Given its very small spot beam size, BDL technology can also be applied extensively to thin foil manufacturing, such as in cutting and/or welding processes. Joining (welding) of thin foils has always been required, for example, in battery cell applications [3]. In addition, with a very small spot size, the heat distortion is also minimized, which means post-weld heat treatment to remove residual stresses may not be required [1].…”

Section: Introductionmentioning

confidence: 99%

“…Limited articles have been published on blue laser or blue diode lasers related to welding, cladding, and materials processing, and they are summarized in the following. Das et al [3] performed welding of multi-layered stainless steel (SS316L) by stacking 20 layers of micro-foils with a thickness of 0.025 mm onto a 0.2 mm thick SS316L foil sandwich and welded them together. They suggested that this welding technique is suitable for industrial needs, especially for electrical micro joining, as it results in free cracks, low porosity, and low spatter.…”

Section: Introductionmentioning

confidence: 99%

Blue Diode Laser Welding of Commercially Pure Titanium Foils

Pasang

Lin

Misiołek

et al. 2022

QuBS

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The need for thin foil welding is increasing significantly, particularly in the electronic industries. The technologies that are currently available limit the joining processes in terms of materials and their geometries. In this paper, a series of trials of fusion welding (bead-on- plate) of commercially pure titanium (CPTi) foils were conducted using a blue diode laser (BDL) welding method. The power used was 50 W and 100 W for 0.1 mm and 0.2 mm thick foils, respectively. Following welding, various samples were prepared to examine the weld profiles, microstructures, hardness, tensile strength, and fracture surface characteristics. The results showed that the base metal (BM) had an annealed microstructure with equiaxed grains, while the weld zones contained martensite (α’) with large grains. The hardness increased in both regions, from around 123 HV to around 250 HV, in the heat-affected zone (HAZ) and fusion zone (FZ) areas. The tensile tests revealed that the strengths of the welded samples were slightly lower than the unwelded samples, i.e., UTS = 300–350 MPa compared with 325–390 MPa for the unwelded samples. Fracture took place within the BM area. All of the samples, welded and unwelded, showed identical fracture mechanisms, i.e., microvoid coalescence or ductile fracture. The weld zone experienced very small strains (elongation) at fracture, which indicates a good weld quality.

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Blue laser welding of multi-layered AISI 316L stainless steel micro-foils

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 33 publications

References 29 publications

Laser welding of current collector foil stacks in battery production–mechanical properties of joints welded with a green high-power disk laser

Laser welding of current collector foil stacks in battery production–mechanical properties of joints welded with a green high-power disk laser

Investigation of nickel coated steel tapes welded joints

Blue Diode Laser Welding of Commercially Pure Titanium Foils

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