According to BMW experts, at the time of welded diaphragms, BMW has used a dual-focus laser welding technology. Because the technology in welding process of aluminum alloy material with good performance, so widely used in the mass production of the BMW company in the process.
Laser welding, the dual-focus laser welding technology on the material to be welded to form small spacing of two focus points, splitting and stacking of the laser beam can be achieved. Two superimposed to form a laser beam of laser light source, can greatly increase the power of laser stability, production, product quality and production flexibility. Laser
Improvement of welding power can increase the depth of laser welding seam on one hand and then laser welding the welding speed can be increased and also avoid common weld in aluminum alloy welding and welding defects such as burn-through.
From the perspective of users of laser welding technology company, a not entirely able to solve the problem of laser welding technology of standardization. This issue focuses on device connection interface and different spare parts for welding equipment. BMW experts point out that standardization would allow laser optical equipment, spare parts Simplify production and manufacturing in the world. VW company experts is similar to BMW's expert opinion and believes that standardization can also improve the effectiveness of the laser equipment. The laser medium is an extremely thin reflective film, between its percentage to 200 per cent a few micrometers in thickness. Pulsed laser beam compact reflector systems index multiple times, finally shot by Crystal. Although the reflective film thickness is small, but its reflection high total efficiency is very high. Mr h ü gel that: this laser technology combines CO2 laser technology with the advantages of a nd: YAG solid state laser technology, can open up new areas of application in the future.
The use of laser welding is growing, Germany VW Touran car company is a good example. In this new car, the number of laser welds up to 1400, total length of weld 70m. In the production of comfortable, attractive open-topped limousine, VW company technicians and Austria expert Fronius welding company developed a laser-hybrid welding technology. At the senior open-topped limousine doors, laser hybrid welding seam length reached 3570mm, pure laser welding seam length is 3 times.
VW's materials experts say compared with pure laser welding, laser hybrid welding technology can greatly improve the connectivity of sheet metal slot. Which makes more use of the laser for VW company high speed stability of welding arc welding process. Another application example is the BMW 5 series BMW aluminum separators using laser hybrid welding technology and deformation of high pressure processing in aluminum alloy support frame are welded together.
Compared with the separate use of laser welding technology, laser hybrid welding technology has significant advantages. Laser mixed advantage is mainly reflected in: greater depth/welding ability of a larger gap; the toughness of weld better, by adding supplementary materials can exert influence on weld lattice organization; no burn-back seam down phenomenon; a wider scope; with laser replacement technology less investment. Mixed laser MIG gas welding, main advantages are: higher welding speeds; welding depth; produces less heat; high weld strength; weld width small weld small protruding. Thus making the whole system of production process stability, equipment availability, good weld after weld preparation work and welding work; welding production hours short, low cost, high efficiency; has good optical equipment performance.
However, laser hybrid welding in the power equipment investment cost is relatively high. As the market expanded, power supply prices will decline, and will enable the laser hybrid welding technology applied in more areas. At least laser-hybrid welding technology in welding of aluminum alloy material is a non- Proper welding process, over a longer period of time as a major welding tools. In contrast, Trumpf Gesch?ftsbereichsLasertechnik spokesman said: laser technology, every year there are new advances. Laser equipment there is very strong competition between manufacturers, which naturally hinders a different laser technology equipment research and development enterprise integrated product research and development. So-called standardized only the laser cable interface standardization. To do this step, the prerequisite is durability, warranty the warranty liability and warranty time and recognition process. Meanwhile, the spokesman also agreed in all areas of laser technology and development trend of laser performance is constantly improving. This trend could increase the laser power and beam quality of the laser. With the new laser equipment programmes and new designs, as well as new applications of laser technology, this development can be achieved in the near future.