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　　Laser welding equipment Competitive situation and development trend

1. High power YAG laser welding

With the continuous development of lasers, fiber lasers and disk lasers have come out one after another. The emergence of new lasers brings not only more stable beam quality, but also greater energy. The 10000 watt laser provides a broader application space for laser welding, and opens a breakthrough for completing the splicing and lapping of thicker structural parts and the laser welding of high reflectivity metal materials. Therefore, high power must become a primary direction for the development and application of laser welding technology in the future.

2. Real time monitoring of laser welding process

The light, steam and plasma emitted during laser welding, the sound caused by the change of molten pool pressure, the ultrasonic wave caused by mechanical stress in the weldment, the dielectric constant of metal vapor or plasma, the reflected laser power, the behavior of molten pool and small hole all reflect the mechanism of welding process to a certain extent. Direct observation and analysis can complete welding automation on the one hand, On the other hand, it can intuitively understand the welding process, which is helpful to study the welding mechanism, so as to better control the disadvantages.

3. Discussion on laser welding of aluminum alloy

Aluminum alloy is widely used in aviation data, and its laser welding has always been in a difficult situation: on the one hand, laser welding aluminum alloy has small deformation and can reduce weight by about 20%. On the other hand, because of the characteristics of aluminum alloy, it has the disadvantages of strong reflection to light, fast heat dissipation, simple generation of pores and so on. Therefore, the research on laser welding of aluminum alloy has attracted much attention, and will be one of the technical directions of laser welding in aviation manufacturing industry.

4. Application of various laser welding methods

With the development of laser welding technology, a single laser welding technology is far from meeting the welding needs of different materials and different structural parts. What came into being is the innovation and discussion of various new welding methods. Relying on the emerging laser welding methods or the combination of various methods, we hope to deal with the problems encountered in the current laser welding.