Recently, the Joint Laboratory of Engine Science and Engineering of the Institute of Mechanics of the Chinese Academy of Sciences has made important progress in the laser welding technology of turbocharger dissimilar materials. The optimized laser welding process has provided important support for improving the performance of diesel engines.
â– New technology will optimize the welding process At present, diesel engines are widely used and occupy an important position in the development of the national economy. As a key component of diesel engines, turbochargers have a significant effect on the improvement of engine power performance, and the welding quality of dissimilar materials has an important impact on the performance of the whole machine.
In the diesel engine supercharger, the materials of the turbine blade and the vortex shaft are different, and the parameters are greatly different. When the two are connected, the welding crack is easily formed, and the hardening tendency is obtained. At present, the industry often uses friction welding to connect, but the strength is not high, and the poor forming precision is a defect of friction welding.
Laser welding is a new way. It utilizes the characteristics of laser coherence and so on, which solves the problem of weld partial melting and unfusion. Compared with the traditional welding process, the optimized laser welding process greatly improves the welding efficiency while meeting the high welding strength requirements, and provides important technical support for improving the performance of the diesel engine.
■New results of independent research and development The deputy director of the Joint Laboratory of Engine Science and Engineering, Institute of Mechanics, Chinese Academy of Sciences, said in an interview that with the expansion of market demand, the automotive industry has developed very well in recent years, but its own technology is scarce. The problem of lack of independent research and development environment has not been solved. It is difficult for domestic companies to cooperate with multinational companies to acquire core technologies. “There is no core technology and subsequent research and development and improvement, which will have adverse effects on the development of the industry. At present, some automobile manufacturing enterprises and scientific research institutions have started independent research and development, but the concept of 'takenism' is still very strong, true autonomy. R&D results are few and far between."
Laser technology involves materials science, mechanics, and computer science. R&D is a process of consumption, with high input requirements and long payback period. It is difficult to keep up with the speed of enterprise R&D alone. Therefore, some of the pressure has been transferred to national research institutions. The Institute of Chinese Academy of Sciences contains all fields of natural sciences and engineering research, and technically it is the most representative department of the country. Zhai Gang said: "It is in this context that our mechanics has started to tackle the problem from the most basic point of view. There has been no new progress in the field of laser dissimilar material welding. After long-term efforts, our mechanics have made breakthroughs. Sexual progress, leading the international level. It can be said that this is a 100% international advanced technology with independent intellectual property rights."
â– Industrialization needs policy support to talk about the industrialization prospects of laser welding technology for dissimilar materials. Qi Gang said that this technology is very mature and the market has such demand, and its industrialization potential is great. But industrialization is risky. He just calculated the account for the reporter. If a basic research only needs to invest one yuan, then it will cost 10 yuan to turn the research into a usable technology, and 100 yuan for real industrialization. “This ratio has made many companies unable to bear. Most domestic companies do not have this ability to resist risks, so many companies are reluctant to do so.â€
Zhai Gang believes that the practice of Germany and the United States in this regard is worth learning. “In terms of R&D, application and industrialization of new technologies, they all have a set of policies that guide and encourage. The government strongly supports the research and development and application of new technologies through direct investment and return of taxes, mobilizing the enthusiasm of enterprises and consumers. A virtuous circle. Industrialization is a complex radial system that requires sound legal and social mechanisms. Although China has a set of incentives, it is difficult to implement it."
Zhai Gang said that although the technology itself has no problem, the large-scale promotion and application may not be smooth. “This is not a problem that a person or a company can solve. Many conditions limit the industrialization of a new technology. Only with the joint efforts of all people, can the promotion and application of this new technology be realized under the promotion of a healthy mechanism.â€
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