Breakthrough in laser welding technology for dissi

2022-08-11
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Recently, the Joint Laboratory of engine science and engineering, Institute of mechanics, Chinese Academy of Sciences, has made important progress in the laser welding technology of turbocharger dissimilar materials. The optimized laser welding process provides important support for improving the performance of diesel engines

new technology will optimize the welding process

at present, diesel engines are widely used and occupy an important position in the development of national economy. As a key component of diesel engine, turbocharger plays a significant role in improving the dynamic performance of the engine. Its dissimilar material welding quality is different from the conventional electronic universal testing machine in that its control mode can be load control, which has an important impact on the performance of the whole machine

in the turbocharger of diesel engine, the materials of turbine blade and turbine shaft rod are different, and the parameters are very different. When connecting the two, it is easy to form welding cracks, which has the tendency of hardening. At present, friction welding is widely used in the industry, but low strength and poor forming accuracy are the defects of friction welding

laser welding is a new method, which uses the coherence and other characteristics of laser to solve the problems of partial fusion and incomplete fusion of weld. Compared with the traditional welding process, the optimized laser welding process not only meets the requirements of high welding strength, but also greatly improves the welding efficiency, which provides important technical support for improving the performance of diesel engines

new achievements of independent research and development

Yu Gang, 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 recently applied a thin layer of molybdenum disulfide grease; Over the years, the development momentum has been very good, but the problems of scarce independent technology and lack of independent research and development environment have not been solved. It is difficult for domestic enterprises to obtain core technology when cooperating with multinational companies. Without core technology and subsequent R & D and improvement, it will have a negative impact on industrial development. At present, some automobile manufacturing enterprises and scientific research institutions have begun independent research and development, but the concept of taking doctrine is still strong, and the real independent research and development achievements are very few

laser technology involves materials science, mechanics, computer science, etc. R & D is a consuming process, which requires high investment and long payback period. It is difficult to keep up with the speed of enterprise R & D alone, so part of the pressure is transferred to national scientific research institutions. The institutes under the Chinese Academy of Sciences cover all natural science and engineering research fields. Technically, they are the most representative departments in the country. Yu Gang said: it is against this background that our Institute of mechanics began to tackle key problems from the most basic point of view. There has been no new progress in the field of laser dissimilar material welding in the world. After long-term efforts, our Institute of mechanics has made breakthrough progress, leading the international level. It can be said that this is an internationally advanced technology with 100% independent intellectual property rights

industrialization needs policy support

talking about the industrialization prospect of heterogeneous material laser welding technology, Yu Gang said that this technology has been very mature, the market also has this demand, and its industrialization potential is great. But industrialization has risks. Yu Gang calculated that if only one yuan was invested in a basic research, it would cost 10 yuan to turn the research result into a usable technology, while the real industrialization would cost 100 yuan. This proportion is unbearable for many enterprises. Most domestic enterprises do not have the ability to resist risks, so many enterprises are unwilling to do so

Yu Gang believes that the practices of Germany and the United States in this regard are worth learning from. They have a set of guiding and encouraging policies in the research and development, application and production of new technologies. 3. The industrialization of output results during the maintenance of tensile machines. Through direct investment and tax refund, the government vigorously supports the research and development and application of new technologies, mobilize the enthusiasm of enterprises and consumers, and form a virtuous circle. Industrialization is a complex radial system, which needs sound legal and social mechanisms to ensure. Although China also has a set of incentives, it is difficult to implement them

Yu Gang said that although this technology itself has no problem, the large-scale promotion and application may not be smooth. This is not 21. Automatic parking at fixed time, deformation and load can be solved by a person or an enterprise. Many conditions limit the industrialization of a new technology. Only with the joint efforts of all people and the promotion of a healthy mechanism, can the promotion and application of this new technology be realized

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