Article
Materials Science, Multidisciplinary
T. Krichel, S. Olschok, U. Reisgen
Summary: A recent research project at RWTH Aachen University has shown that laser beam spot welding has advantages over line welds in terms of the magnetic properties of an iron core, thus increasing the efficiency of electric motors. This study explores the effects of reduced working pressure on the welding results in the range of 1 mbar to 1000 mbar in vacuum laser beam welding.
Article
Automation & Control Systems
Joon Ho Cha, Hae Woon Choi
Summary: Laser welding offers many advantages in the manufacturing of EV battery packs, with the ability to optimize results and tensile strength by adjusting output ratios and other conditions. Increasing power may widen weld seams and form small pores, but penetration depth does not significantly change.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Optics
SeungGu Kang, Joonghan Shin
Summary: This study investigated the impact of different laser beam intensity distributions on aluminum alloy butt welding, finding that welding with modulated beams can reduce weld defects and achieve higher tensile strength.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Yunfei Meng, Jiangwang Fu, Mengcheng Gong, Shuai Zhang, Ming Gao, Hui Chen
Summary: By using a novel 8-shaped beam oscillation, the uneven heating and reaction at the interface in laser circular oscillating welding of Al/Mg lap-joint with Ti as interlayer were solved, leading to improved connection width and shear tensile force.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Crystallography
Daniel Garcia-Navarro, Juan Carlos Ortiz-Cuellar, Jesus Salvador Galindo-Valdes, Josue Gomez-Casas, Carlos Rodrigo Muniz-Valdez, Nelly Abigail Rodriguez-Rosales
Summary: The study on FSW of 6061-T6 aluminum with pure Cu plates showed that adjusting processing parameters can reduce common defects, leading to improved mechanical properties and minimal increase in electrical resistivity of the joints.
Article
Materials Science, Multidisciplinary
F. S. Li, L. H. Wu, H. B. Zhao, P. Xue, D. R. Ni, B. L. Xiao, Z. Y. Ma
Summary: This study proposes the use of laser beam welding in a low vacuum environment to achieve deep weld penetration in titanium alloy thick plates, surpassing the penetration achieved in atmospheric conditions. The fusion zone mainly consists of acicular a0 martensite, resulting in higher strength than the base material.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Automation & Control Systems
Yongki Lee, Jason Cheon, Minjung Kang
Summary: The study conducted experiments on aluminum alloys using vacuum laser beam welding and found that decreasing ambient pressure improves welding characteristics such as increasing penetration depth and reducing defect formation. An ambient pressure of 10 mbar is considered sufficient to ensure good welding properties and stability.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yang Lu, Jian Lai, Junping Pang, Xin Li, Chen Zhang, Ming Gao
Summary: This study investigates the effects of beam oscillation frequencies on the properties of oscillating laser-welded 5A06 aluminum alloy lock butt joints, specifically at the lock step. The results indicate that increasing the oscillation frequency improves the microstructure by reducing the columnar grain zone and porosity while increasing the angle between the lock step and fusion line. This leads to higher ultimate tensile strength and elongation in the oscillating weld compared to non-oscillating weld.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Lei Kang, Xin Li, Jing Chen, Yu Zhang, Ting Wang
Summary: This research investigated the microstructures and mechanical properties of laser penetration welded joints of overlap steel-on-aluminum. It was found that adding a nickel interlayer significantly enhanced the tensile property of the joint and decreased the hardness of the intermetallic compounds, thus improving the toughness of the welded joint.
Article
Chemistry, Physical
Sajid Ali, Joonghan Shin
Summary: With the increasing demand for electric vehicles, the challenges posed by the joining of dissimilar materials in the EV batteries need to be addressed. Laser beam welding shows promise for joining aluminum and copper, but the differences in thermal and metallurgical properties between the two materials make the production of Al-Cu joints challenging. Therefore, characterizing the weld and improving the welding process are vital for enhancing joint performance.
Article
Crystallography
Darina Kaisheva, Angel Anchev, Vladimir Dunchev, Georgi Kotlarski, Borislav Stoyanov, Maria Ormanova, Stefan Valkov
Summary: This study presents the results of electron-beam welding on copper and Al6082T6 aluminum alloys. The influence of beam scanning geometries on the structure and mechanical properties of the welded joint is investigated. X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were used to analyze the phase composition, microstructure, and chemical composition of the welded joints. Microhardness investigations were conducted to study the mechanical properties. The results showed that the beam scanning geometries have a significant impact on the weld structure and increased beam oscillation radius led to a decrease in intermetallic phases and improved homogeneity. The microhardness values of the weld joint were higher than the base metals due to the formation of intermetallic phases.
Article
Materials Science, Multidisciplinary
Eriel Perez Zapico, Alessandro Ascari, Alessandro Fortunato, Erica Liverani, Vincenzo Dimatteo
Summary: This study investigates the use of a blue laser for welding dissimilar thin sheets in the field of e-mobility. By using a 1.5 kW laser source with a wavelength of 450 nm, copper sheets and aluminum sheets were successfully welded, achieving good electrical and mechanical performance. Design of experiment approach was utilized to plan the experiments, and metallographic analysis was conducted to evaluate the welding results.
JOURNAL OF LASER APPLICATIONS
(2022)
Article
Energy & Fuels
Alexander Olowinsky, Christoph Spurk, Johanna Helm, Arnold Gillner
Summary: Battery technology is vital for the future of sustainable electric mobility, especially lithium-ion batteries in the automotive industry. To meet the growing demand, it is important to have efficient and cost-effective processes for battery cell production. The article discusses the development of laser-based electrode stack contacting for lithium-ion battery cells, focusing on using laser beam welding to join aluminum and copper electrodes within a short time.
Article
Materials Science, Multidisciplinary
Jianguo Ma, Haoxiang Deng, Li Liang, Wei Tong, Xingfu Wang, Nanle Yang, Zhiyong Wang, Wei Wen, Le Yang, Jiefeng Wu, Zhihong Liu
Summary: A crack-free high-Mn TWIP steel welding joint with comparable strength and superplasticity was obtained via vacuum electron beam welding. The microstructural evolution, mechanical behaviors, and strengthening mechanism of the welding joint were investigated. The results showed that the welding joint had a typical nail-shaped cross-section and could be divided into three zones: base metal, heat-affected zone, and fusion zone. Fine AlN-type precipitates were observed in the welding joint with a hexagonal crystal structure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Optics
Jianfeng Gong, Genchen Peng, Liqun Li, Hongbo Xia, Shenghao Meng, Jiming Wang
Summary: This study discussed the correlation between plasma plume and laser energy transmission during vacuum laser welding of aluminum alloy. It was found that the influence of plasma plume on laser energy transmission mainly includes changes in the laser spot caused by laser refraction and the attenuation of laser energy mainly affected by inverse bremsstrahlung absorption and scattering. These factors were sensitive to ambient pressure and decreased as the ambient pressure decreased.
OPTICS AND LASER TECHNOLOGY
(2021)