The complex, the first experimental version of which has already been constructed and is being tested by scientists from this world-famous space science and technology centre, involves two energy sources, a Nd-YAG-laser (a neodymium-yttrium aluminium garnet laser), which is what performs the spot weld itself, and a special light module, a powerful source of light, the spectrum of which can be altered. And, of course, there is the requisite equipment and the corresponding software, which enables automatic welding over a pre-set program.
The crux of the method indeed lies in the use of this second, light source of radiation. Its power and spectral attributes are such that it can quickly and effectively heat a weld area and its surrounding space to a temperature, if required, to over 1000 degrees. In its turn, this is a guarantee that defects that form under the welding of cold (that is specially non-heated) parts are significantly fewer, while the need for annealing ready products is eradicated altogether.
Indeed, welders have long since known that the quality of a weld-join is essentially better if the parts to be welded are well heated. Cases have even been known when large metal parts are welded even before they have cooled after smelting. But how can you heat parts sufficiently quickly and effectively if one of them is made, for example, from invar (an iron-nickel alloy), which hardly alters its dimensions when heated, and the other is made from glass? How can they be heated to high temperatures without damaging them?
To resolve this problem, Doctor of Technical Sciences Valentin Sysoev and his colleagues proposed the use of a powerful lamp where, shining the beam of this lamp on the surface to be welded, can heat the item to the required temperature. In principle, such sources of energy could be the only ones to use for welding, only the excessively large diameter of the light beam (up to 2-3mm) and certain other features mean that they cannot be used for spot welding. However, the scientists believe that using them not for welding but for heating a surface, inside which a narrow laser beam will perform the spot weld, is not only possible, but also very necessary. The fall in temperature between the point of the weld and around it will be much smoother, and this is what defines the exceptionally high quality of the weld.
If we take account of the fact that a combined approach of this kind can use weaker lasers, than those that are traditionally applied, it will transpire that this new method is not only more effective, but is also more economical as the price of lasers is proportionate to their power. So it can be hoped that in the very near future the process of laser welding of car chassis and other items of importance to us all will be better and cheaper. The guarantee for this is the very highest level of professionalism of the team of scientists on this project and the financial support provided to the scientists by the ISTC.
Andrew Vakhliaev | alfa
NASA detects solar flare pulses at Sun and Earth
17.11.2017 | NASA/Goddard Space Flight Center
Pluto's hydrocarbon haze keeps dwarf planet colder than expected
16.11.2017 | University of California - Santa Cruz
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
17.11.2017 | Physics and Astronomy
17.11.2017 | Health and Medicine
17.11.2017 | Studies and Analyses