For many years, in the fields of aerospace, transportation, and deep-sea equipment, some non-standard key parts and components have been manually welded. In the words of relevant experts from CRRC, these key parts have high welding technology accuracy. If they fail to meet the requirements, they will be scrapped or accidents will occur during operation.
On February 8, the reporter learned from the science and technology department of the Wuxi Xishan Economic Development Zone in Jiangsu that the He Xiaoyang scientific research team of Wuxi Hanshen Electric Co., Ltd. in this area has successfully developed a new type of handheld laser welding robot in response to the processing problems of my country’s high-end manufacturing industry. The successful application of CRRC's new high-speed maglev train project not only solves the problem of beautiful and defect-free welds, but also makes post-processing difficult to deform, and the flaw detection pass rate is 100%.
High speed and light weight, higher requirements for welding technology
According to relevant experts, the development of high-speed passenger cars, subway passenger cars, light rail cars and high-speed heavy-duty trucks, the lightweight of trains is the optimal condition for increasing train speed.
The deputy chief engineer of CRRC's Qishuyan Institute told reporters that the CRH380A high-speed EMU ran at a maximum operating speed of 486.1 kilometers per hour on the Beijing-Shanghai line, breaking the world's high-speed rail speed. Such a high speed poses a great challenge to the performance of the material and the gear itself, and the reliable sealing of the box.
"At present, my country's high-speed car body materials have also developed from ordinary alloy steel materials in the past to stainless steel and aluminum alloy profiles." He Xiaoyang, chairman of Wuxi Hanshen Electric Co., Ltd., said that the change of materials puts forward higher requirements on welding technology, and it is natural. Promoting the improvement of processing technology, the high and new technology of laser welding and cutting integrated machine has also been introduced into the production line of railway vehicles.
"The high-speed train body is made of high-strength aluminum alloy materials. It is currently difficult to meet the welding quality requirements by relying on traditional welding equipment." Professor Wang Kehong of Nanjing University of Science and Technology said. The use of hand-held laser welding robots independently developed by China is compared with traditional manual welding. The argon arc welding process, the laser welding speed is faster, the beam will not shift when the laser passes through the electromagnetic field, it can be welded in a vacuum and a specific gas environment, and it can be accurately positioned. It can be applied to the group welding of small and micro workpieces that are automatically produced in large quantities. Realize automatic high-speed welding.
Improve welding accuracy and let laser welding equipment replace imports
Liu Haijun, deputy general manager of Wuxi Hanshen Electric Co., Ltd., told reporters that laser welding technology is an advanced technology of precision manufacturing. In some developed countries in the world, it has been applied in aerospace, shipbuilding, rail vehicle manufacturing, sheet metal processing, automobile manufacturing and other industries very early. Before, the domestic laser welding technology was still in the laboratory stage, and the small amount of laser welding equipment put into use mainly relied on imports and was expensive.
"In order to break the technical barriers of laser welding equipment and promote the development of domestic precision manufacturing, since 2008, we have cooperated with scientific research institutes to jointly develop high-power laser welding equipment. At first, we developed new models for the application needs of special fields such as ships. Welding equipment. In the past 10 years, guided by the concept of intelligence, we have concentrated our scientific research efforts, aiming at rail vehicles for laser welding technology and laser welding intelligent equipment research and development. We have overcome many key technical problems from materials to technology and technology, and finally developed Successfully replaced imports." He Xiaoyang said.
According to relevant experts, at present, the new handheld laser welding robot is a relatively advanced connection technology. Compared with traditional welding methods, its advantages and advantages of welding technology are very obvious: welding speed is fast, and the surface is beautiful; after the laser is focused, the power High density; large welding seam depth and high welding seam strength; welding can be carried out at room temperature or under special conditions, as well as refractory titanium, quartz and other materials, which effectively improves welding accuracy and efficiency.
However, in the opinion of relevant experts, although my country has made new breakthroughs in the field of laser welding, the application fields are still limited. To achieve large-scale applications in multiple fields, it is urgent to deepen collaborative innovation and improve the stability of higher-power laser light sources. The above, as well as the welding process and materials, welding process equipment requirements and welding process parameter monitoring and control technology, etc., to enhance the core competitiveness of the laser welding industry in the province. At the same time, it is necessary to speed up the formulation of relevant national standards and the introduction of policies to encourage the localization of welding equipment procurement, to better promote the innovation and development of the laser welding industry, and to provide important equipment and technical support for the construction of aerospace, transportation, and marine power.