The application of laser technology in the manufacturing industry is the current research focus of various countries, with the industrial development of efficient, environmental protection, automation needs, the application of laser technology rapidly spread in many areas of the manufacturing industry. On this basis, laser welding process will become one of the important aspects of laser application.
Laser welding is an important content of the application of laser processing technology, and it is the most eye-catching and most promising welding technology in the 21st century. As early as the end of the last century, European and American countries have fully applied laser welding to industrial production, China has accelerated the research and development of laser welding technology at the same time, gradually established a "production, study, research" combination of development system, and in individual fields have made a great breakthrough.

With the development of industrial manufacturing, efficient, agile and environmentally friendly processing technology will be favored. Laser welding with its high-energy beam focusing mode, in the welding process can achieve deep penetration welding, rapid welding and other welding processes more difficult to achieve the form, especially the laser welding equipment collocation flexible, real-time online detection technology mature, so that it can achieve a high degree of automation in mass production, there are a large number of laser welding production lines into industrial production.

Practice has proved that laser welding in the processing industry is very wide range of applications, basically the traditional welding process can be used in the field, laser welding can be competent, and higher welding quality, faster processing efficiency.

01 Welding process using laser technology

Laser welding is the use of laser radiation energy to achieve effective welding process, its working principle is: through a specific way to stimulate the laser active medium, so that it oscillates in the resonator, so as to form an excited radiation beam, when the beam and the workpiece contact, its energy is absorbed by the workpiece, the temperature reaches the melting point of the material can be welded.

02 Laser welding mode
Laser welding can be divided into heat conduction welding and deep fusion welding, the former heat through the heat transfer to the internal diffusion of the workpiece, only in the weld surface melting phenomenon, the workpiece is not completely melted through, basically does not produce vaporization phenomenon, mostly used for low-speed thin-wall materials welding; The latter not only completely melts through the material, but also vaporizes the material, forming a large amount of plasma, due to the large heat, the keyhole phenomenon will appear at the front of the molten pool. Deep penetration welding can completely penetrate the workpiece, and the input energy is large, the welding speed is fast, is currently the most widely used laser welding mode.

03 Advantages of laser welding
The reason why laser welding has received such high attention lies in its unique advantages:
The use of laser welding can obtain high quality joint strength and a larger depth to width ratio, and the welding speed is relatively fast.
Since laser welding does not require a vacuum environment, remote control and automated production can be achieved through lenses and optical fibers.
(3) Laser has a large power density, has a good welding effect on difficult welding materials, and can weld materials with different properties.