Welding Metal Foils now Easier
The Laser Zentrum Hannover e.V. (LZH) have optimized processing methods to make laser welding of thin metal foils (50 µm to 1.5 mm) easier by using a specially designed clamping device. Also, welding costs can be cut by using a lower power solid-state laser.
For small and medium sized enterprises (SME) which use lasers to weld thin metal sheets, lasers with continuous wave radiation are often too expensive. This is due to the high output powers necessary for the welding process.
Pulsed Nd:YAG lasers are economically interesting, and offer an alternative to continuous wave lasers. Due to their high peak pulse output, welding with relatively low medium output power (100 w to 250 W) is possible, and investment costs can be reduced.
However, the narrower welding seams from the pulsed lasers not as strong as the seams from continuous lasers. Results can be improved if the parameter selection is optimized. This was the goal of a recently completed project at the Laser Zentrum Hannover e.V. (LZH).
The results of this project aim at simplifying the parameter selection for pulsed laser welding, for example pulse duration, pulse form or pulse peak output. Also, reference parameters for welding with continuous wave radiation have also been recorded. For both types of laser welding, high seams qualities could be qualified and weld imperfections avoided, as shown in surface testing and seam cross-sections. For the investigations, both ferritic and austenitic steels with sheets thicknesses up to 1.5 mm were butt joint welded.
Also, thin foils with a minimal thickness of 50 µm were butt-joint welded. To accomplish this, the LZH developed and constructed a high precision clamping unit, which not only assures a zero gap, but also avoids a lateral edge mismatch.
Especially SMEs can use the results of the welding tests, which are available in an electronic database on the LZH internet site (www.lzh.de). The database provides welding and laser parameters as well as pictures of the expected seams surfaces, cross-sections and micro-hardness tests. Firms can use this data to estimate welding results. Apart from simplifying the selection of appropriate parameters, users can easily expand the database themselves by adding parameters of their own welding tasks to the database and accessing them when needed.
The investigations were commissioned by the Research Association of the German Welding Society (DVS) and funded by the German Federation of Industrial Research Associations "Otto von Guericke" e.V. (AIF) in project 15.297N.
Laser Zentrum Hannover e.V.
Tel.: +49 511 2788-151
Fax: +49 511 2788-100
The Laser Zentrum Hannover e.V. (LZH) carries out research and development in the field of laser technology and is supported by the Ministry of Economic Affairs, Labour and Transport of the State of Lower Saxony (Niedersächsisches Ministerium für Wirtschaft, Arbeit und Verkehr).
Michael Botts | idw
The most recent press releases about innovation >>>
Die letzten 5 Focus-News des innovations-reports im Überblick:
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Mapping the interaction of a single atom with a single photon may inform design of quantum devices
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...