Application scope of handheld fiber laser welding machine
Laser Tailor Welding (LTW) technology has been widely used in foreign car manufacturing. According to statistics, in 2000, there were more than 100 production lines of laser Tailor Welding (LTW) for tailoring blanks worldwide, with an annual output of 70 million pieces of Tailor Welding blanks for car components, and it continues to grow at a high speed.Domestic production introduced models also use some cutting blank plate structure.In Japan, CO2 laser welding is used to replace flash welding for the connection of rolled steel coels in the steel making industry. The research on ultra-thin sheet welding, such as foil with a thickness of less than 100 microns, cannot be fused, but it can be successfully welded by YAG laser welding with a special output power waveform, which shows the broad future of laser welding.Japan is also the first country in the world to successfully develop YAG laser welding for the maintenance of thin tubes of steam generators in nuclear reactors, and also the gear laser welding technology in China.
With the continuous development of science and technology, many industrial technology on the special requirements of materials, the application of smelting method of materials can not meet the needs.Due to the special performance and manufacturing advantages of powder metallurgy materials, in some fields such as automobile, aircraft, tool and cutting tool manufacturing industry is replacing the traditional metallurgical materials, with the growing development of powder metallurgy materials, it is increasingly prominent with other parts of the connection problem, so that the application of powder metallurgy materials is limited.In the early eighty s, laser welding, with its unique advantage into the field of powder metallurgy materials processing, has opened up new prospects for the application of the powder metallurgy materials, such as using powder metallurgy material connection that is commonly used in welding diamond brazing method, because of the low bonding strength, heat affected zone width in particular can not adapt to high temperature and high strength requirement caused by solder melting loss, using laser welding can improve weld strength and high temperature resistant performance.
The car industry
In the late 1980s, the kilowatt laser was successfully applied to industrial production, and now the laser welding production line has appeared on a large scale in the automobile manufacturing industry, which has become one of the outstanding achievements of the automobile manufacturing industry.European car manufacturers as early as the 1980s took the lead in the use of laser welding roof, body, side frame and other sheet metal welding, in the 1990s, the United States has introduced laser welding into car manufacturing, although the start is late, but the development is very fast.Italy in most laser welding is adopted in the welding of steel component assembly, the Japanese are used in the manufacturing automobile body covering parts of laser welding and cutting technology, the identity of the laser welding assembly parts because of its excellent performance becomes more and more used in automobile body manufacturing, according to the American metal market, by the end of 2002, the consumption of laser welded steel structure will be 70000 t 3 times more than in 1998.According to the characteristics of large batch and high degree of automation in automobile industry, laser welding equipment is developing in the direction of high power and multi-channel.In process in the United States PrattWitney and Sandia national laboratories in laser welding process in the research, adding metal powder and wire beam technology research institute in Germany Bremen applications use laser welding of aluminium alloy body frame carried out extensive research, more than that is added in the weld filler helps eliminate hot crack, improve the welding speed, solve the problem of tolerance, the development of the production line has been put into production in the factory.
The electronics industry
Laser welding is widely used in electronic industry, especially in microelectronic industry.Laser welding shows its unique advantages in the packaging of integrated circuits and semiconductor device shells because of its small heat-affected zone, rapid heating concentration and low thermal stress. In the development of vacuum devices, laser welding has also been applied, such as molybdenum focusing electrode and stainless steel support ring, fast hot cathode filament assembly and so on.Sensor or temperature controller in the elastic thin-wall corrugated sheet thickness in 0.05-0.1mm, using the traditional welding method is difficult to solve, TIG welding easy to weld through, plasma stability is poor, many factors and the use of laser welding effect is very good, has been widely used.
Laser welding of biological tissues began in the 1970s. The successful welding of fallopian tubes and blood vessels by laser and its advantages have made more researchers try to weld various biological tissues and extend it to the welding of other tissues.Domestic and foreign researches on laser nerve welding mainly focus on laser wavelength, dose and its effect on functional recovery as well as the selection of laser solder, etc. Liu Tongjun conducted laser welding of small blood vessels and skin on the basis of basic research and welding of common bile duct of great white mice.Compared with the traditional suture method, laser welding has the advantages of fast anastomotic speed, no foreign body reaction in the healing process, maintaining the mechanical properties of the welding site, and growing the repaired tissue according to its original biomechanical properties, which will be more widely used in the future biomedical science.
In other areas
In other industries, laser welding is also gradually increasing, especially in the special material welding in China has carried out a lot of research, such as BT20 titanium alloy, HEL30 alloy, Li-ion battery laser welding, Germany has developed a new laser welding technology for flat glass.