Laser welding technology protects subway safety

Guide: Recently, Wuhan Metro launched a cherry blossom subway. Large pink cherry blossoms in the carriage willfully 'bloomThere are endless creative interiors of similar subways around the world, such as the Disney train in Hong Kong, the IKEA subway in Japan, and the World Cup theme train in Hangzhou... When you get on such a subway, life is a little more fun.

With the development of the city, the subway has become the main force in urban transportation. The creative interior lights up the mood of the passengers, and the laser welding technology is escorting the safety of the subway.

In July 2016, 26 subway trains manufactured and exported in China were returned to the original factory by Singapore due to minor cracks in their bodies. Although there were no safety issues, it can be seen that various countries have very strict safety requirements. Stainless steel has become one of the important development directions due to its better impact energy absorption characteristics, fire safety, lightweight and low maintenance costs. Although the welding performance of stainless steel is excellent, stainless steel car bodies are prone to thermal deformation compared with ordinary carbon steel car bodies. Therefore, laser welding with lower heat input, non-contact type, and continuous welding is an ideal welding method.

In the past, the body of stainless steel urban rail passenger cars has always adopted resistance spot welding structure. This structure has poor appearance and poor sealing. Due to the large number of solder joints, the outer plate structure often has defects such as out-of-plane deformation. . The laser has excellent transmission and focusing characteristics, which can concentrate all the energy in a small area. Therefore, the energy is highly concentrated during laser welding, and it has unique advantages such as high speed, high precision, high quality, low deformation, and easy control. It is especially suitable for welding stainless steel car bodies.

On December 21, 2016, Qingdao Metro Line 11 was officially rolled off the CRRC Qingdao Sifang Locomotive and Rolling Stock Co., Ltd. The use of new laser welding technology not only improves the tightness of the stainless steel car body structure And the overall strength, and make the car body smoother and smoother, and the appearance is more beautiful. At present, the subways in Shanghai, Guangzhou, Shenzhen and other cities use laser welding technology in the production process.

Online Laser Welding Machine for Tailor-made Falile Steel

With the substantial increase in the domestic subway market demand, the application of laser technology will also become more extensive. Rail trains will make people's travel more convenient, safer and more efficient, and the application of laser technology in the rail train manufacturing industry will be closer.