Due to the high power density and fast energy release of laser welding, the processing efficiency is much higher than that of traditional methods. Laser welding has many superior processing characteristics, including precision, speed, small heat-affected zone, etc. Laser welding locally heats the material through high-energy laser pulses. And the energy of laser radiation diffuses into the material through heat conduction, melting the material and forming a specific molten pool. The following are the main application areas of laser welding machines:

Ⅰ. Manufacturing industry
Laser welding machine has been widely used in foreign car manufacturing. According to statistics, in 2000, there were more than 100 laser welding production lines for cutting blanks worldwide, with an annual output of 70 million pieces of car component welding blanks. And it continued to grow at a high rate. Some cutting blank structures are also used in the imported models produced domestically. Japan uses CO2 laser welding instead of flash butt welding for the connection of rolled steel coils in the steelmaking industry, especially in the research of ultra-thin plate welding. Such as foils with a thickness of less than 100 microns, which cannot be achieved by traditional fusion welding. But can be successfully achieved through YAG laser welding with a special output power waveform.
Ⅱ. Powder metallurgy
With the continuous development of science and technology, many industrial technologies have put forward special requirements for materials. And traditional smelting and casting methods can no longer meet the needs. Powder metallurgy materials have gradually replaced traditional smelting and casting materials in the automobile, aircraft. And tool and blade manufacturing industries due to their special properties and manufacturing advantages. However, the connection problems of powder metallurgy materials have become increasingly prominent, limiting their application. Laser welding machine has entered the field of powder metallurgy material processing with its unique advantages. For example, the use of laser welding diamond can significantly improve the bonding strength and high temperature resistance. And solve the problems of low bonding strength and wide heat-affected zone in brazing welding.
Ⅲ. Automobile industry
In the late 1980s, kilowatt-level lasers were successfully applied to industrial production. And laser welding production lines have appeared on a large scale in the automobile manufacturing industry. Europe took the lead in using laser welding for sheet metal welding such as roofs, bodies, and side frames as early as the 1980s. And the United States introduced laser welding technology in the 1990s. Italy uses laser welding in the welding and assembly of most steel plate components. And Japan uses laser welding and cutting processes when manufacturing body panels. High-strength steel laser welded assemblies are increasingly used in automobile body manufacturing due to their excellent performance. According to statistics from the US metal market, by the end of 2002, the consumption of laser welded steel structures will reach 70,000 tons, a three-fold increase from 1998. Laser welding equipment is developing in the direction of high power.

Ⅳ. Electronics Industry
Laser welding is widely used in the electronics industry, especially in the microelectronics industry. Due to the small heat-affected zone, rapid heating concentration and low thermal stress of laser welding. It is particularly suitable for the packaging of integrated circuits and semiconductor device shells. In the development of vacuum devices, such as the connection between the molybdenum focusing electrode and the stainless steel support ring. And the welding of the fast-heating cathode filament assembly, laser welding has also been used. The thickness of the elastic thin-walled corrugated sheet in the sensor or thermostat is only 0.05-0.1mm. The problems that are difficult to solve using traditional welding methods can be well solved by laser welding and are widely used.
Ⅴ. Biomedicine
The application of laser welding in the biomedical field began in the 1970s, and was used for welding fallopian tubes and blood vessels. Laser welding has shown its superiority due to its advantages such as fast welding speed, no foreign body reaction during the healing process, and maintaining the mechanical properties of the welding site. Domestic and foreign research mainly focuses on laser wavelength, dose and its effect on functional recovery, as well as the selection of laser solders. Laser welding is not only used for small blood vessels and skin, but also for welding research of the common bile duct. Compared with traditional suturing methods, laser welding has obvious advantages and is expected to be more widely used in biomedicine.
Ⅵ. Other fields
In other industries, the application of laser welding has also gradually increased, especially in the welding of special materials. Significant progress has been made. Domestic research on laser welding of materials such as BT20 titanium alloy, HEI30 alloy, and lithium-ion batteries has been carried out. Germany has developed a new laser welding technology for flat glass.

Final Thoughts
In general, laser welding machines have high production efficiency, stable and reliable processing quality, and significant economic and social benefits. Laser welding is one of the important applications of laser material processing technology. The welding process is of heat conduction type, that is, the laser radiation heats the workpiece surface, and the surface heat diffuses to the inside through heat conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts.