Russian scientists of the Kovrov State Technology Academy have proposed a new technology for aluminium alloy welding based on using of two lasers. The first laser removes the oxide film by small portions from the surface of welded components, and the second laser executes the welding. Although the first phase lasts for about one millionth of a second, it is very important, since the refractory oxide film deteriorates the welding strength. The new method is also characterized by one more benefit: the place the juncture is covered with a thin film of molten metal increasing the efficiency of laser beam. The film also retains tiny particles, which erupt from the metal in the course of welding and increases the maximal welding depth.
The new laser device consists of two modified lasers, the mirror system and the lens, which focuses the emission on the welding area. The radius of laser beam which performs welding makes 0.3 millimeters. The welding rate was equal to 30 millimeters per minute.
The scientists have experimentally compared the new welding technology with the common one, where only one laser is used. The experiments have proved that a new method provides for twice or thrice higher depth of welding. In addition, the quality of seams (judging by the so-called porosity of weld) increases twice, thus improving the product strength.
Mr. Andrey Siver | alfa
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Friction stir welding is a still-young and thus often unfamiliar pressure welding process for joining flat components and semi-finished components made of light metals.
Scientists at the University of Stuttgart have now developed two new process variants that will considerably expand the areas of application for friction stir welding.
Technologie-Lizenz-Büro (TLB) GmbH supports the University of Stuttgart in patenting and marketing its innovations.
Friction stir welding is a still-young and thus often unfamiliar pressure welding process for joining flat components and semi-finished components made of...
Optical quantum computers can revolutionize computer technology. A team of researchers led by scientists from Münster University and KIT now succeeded in putting a quantum optical experimental set-up onto a chip. In doing so, they have met one of the requirements for making it possible to use photonic circuits for optical quantum computers.
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The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP has been developing various applications for OLED microdisplays based on organic semiconductors. By integrating the capabilities of an image sensor directly into the microdisplay, eye movements can be recorded by the smart glasses and utilized for guidance and control functions, as one example. The new design will be debuted at Augmented World Expo Europe (AWE) in Berlin at Booth B25, October 18th – 19th.
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With the help of artificial intelligence, chemists from the University of Basel in Switzerland have computed the characteristics of about two million crystals made up of four chemical elements. The researchers were able to identify 90 previously unknown thermodynamically stable crystals that can be regarded as new materials. They report on their findings in the scientific journal Physical Review Letters.
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For the first time, Fraunhofer IKTS shows additively manufactured hardmetal tools at WorldPM 2016 in Hamburg. Mechanical, chemical as well as a high heat resistance and extreme hardness are required from tools that are used in mechanical and automotive engineering or in plastics and building materials industry. Researchers at the Fraunhofer Institute for Ceramic Technologies and Systems IKTS in Dresden managed the production of complex hardmetal tools via 3D printing in a quality that are in no way inferior to conventionally produced high-performance tools.
Fraunhofer IKTS counts decades of proven expertise in the development of hardmetals. To date, reliable cutting, drilling, pressing and stamping tools made of...
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29.09.2016 | Materials Sciences
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