Advanced Laser Welding Technology Delivers Crack-Free Electric Vehicle Battery Components Devoid of Filler Wires
The Fraunhofer Institute for Material and Beam Technology IWS in Dresden has developed a groundbreaking laser welding method that is set to transform various industries. This innovative technique, which has been demonstrated in the automotive sector and is under study for pipe welding, is ideal for closing rotationally symmetric containers and is particularly beneficial for the heavy steel industry.
One of the key advantages of this laser welding method is its elimination of the need for filler material. This not only reduces energy consumption and material use but also significantly decreases post-processing. In fact, the process reduces weld volume, saving up to 90 percent filler material, and largely eliminates distortion in heavy steel structures.
The laser welding method has been demonstrated in a large scale, with a laser-welded aluminum battery housing in the automotive sector as part of the EU's ALBATROSS initiative. It is also applicable to electric vehicles, aerospace tanks, and heavy steel structures. In a demonstration involving a 13-foot-long (four-meter-long) crane boom, multilayer laser welding powered by up to 24 kilowatts of energy was used.
The new laser welding method produces crack-free, low-porosity seams at the component scale. It allows for tight, mechanically strong joints with minimal distortion and high seam strength. V-groove preparation has been optimized to opening angles below five degrees in heavy steel demonstrations.
The laser welding method uses dynamic beam shaping to control the melt pool, reduce pores, and stabilize welds. This, coupled with high-frequency scanner technology, flexible power modulation, and open system control, enables design options and application perspectives that conventional arc welding cannot provide, according to Axel Jahn, head of the joining department at Fraunhofer IWS.
The company TRUMPF has also contributed to this development by creating the laser hole welding process for aluminum castings and profiles. This process, which operates without filler material and produces scratch-free, low-porosity melt spots at the absolute component level, is being advanced for secondary aluminum and cast-to-cast joints.
The project targets bridge construction, wind energy, and shipbuilding applications, funded by the Development Bank of Saxony (SAB). It is also being advanced for secondary aluminum and cast-to-cast joints, and for applications in the aerospace industry, using high-strength 2,000-series aluminum alloys.
In conclusion, the new laser welding method offers a promising solution for various industries, providing a more efficient, cost-effective, and environmentally friendly approach to welding. Its ability to join profiles with wall thicknesses over 20 millimeters, weld hard-to-weld alloys and thick sections, and eliminate the need for filler material makes it a game-changer in the field of manufacturing.
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