Advantages of titanium alloy laser welding technology

Advantages of titanium alloy laser welding technology

1. Advantages of laser welding technology

Laser welding technology has received extensive attention and application due to its unique advantages. Its main advantages are as follows

(1) The speed of laser welding is very fast, and there is no welding gap, so it has very high welding quality.

(2) During welding, since a high power density is generated after focusing, the welding depth is also large.

(3) If the position to be welded is difficult to contact, laser welding can be used for long-distance welding.

(4) Laser welding technology can also weld some miniature devices.

(5) For refractory materials such as titanium and quartz, it is very convenient to use laser welding, and the effect is also very good.

2. Influencing factors in laser welding of titanium alloys

When the titanium alloy is welded, it is easy to combine with oxygen, hydrogen and other gases as the temperature gradually increases. During the welding process, if no protective measures are taken, titanium and hydrogen will chemically react to form titanium hydride, which will increase the hydrogen content of the metal and reduce the initial nature of the metal. Therefore, in order to obtain a weld with good joint performance during welding, the strictest protective measures should be taken before welding.

3. The effect of plasma on the laser welding process of titanium alloys

When no control is applied to the plasma, the energy of the laser at the time of incidence is largely absorbed by the plasma, while only a small part of the laser energy passes through the plasma and is absorbed by the laser material to melt the titanium alloy material. However, the depth of melting is not high. However, when the plasma was controlled by side blowing the gas, a full penetration weld was formed. Therefore, in the process of titanium alloy laser welding, proper control measures should be taken to the plasma.

4. The influence of focus position on the laser welding process of titanium alloy

In the laser welding process, the appearance and quality of the laser welded joints are mainly determined by the laser power, welding speed and defocus amount. The laser determines the laser power, and the speed of the table determines the speed of welding. The focus position is adjusted before welding is performed. When designing the laser nozzle, it is necessary to consider how to adjust the defocus amount quickly and accurately, and the focal length of the lens only needs to be based on the position of the focal point. At present, there is a certain error between the focal length of the lens actually purchased and the standard value, and when in use, under the long-term action of the thermal radiation of the laser beam, the focusing performance of the base material of the lens changes greatly, and the focal length of the lens changes greatly. will also change. Therefore, it is necessary to control the height direction within the adjustable range, so that it can adapt to lenses of different focal lengths.

5. Conclusion

The excellent properties of titanium alloys make it widely used in military and aviation fields. With the continuous development of science and technology, laser technology has also been continuously improved. Based on the advantages of laser welding, titanium alloy laser welding technology has become the trend of future development. Therefore, the research of titanium alloy laser welding technology is of great significance for solving the influence of unfavorable factors in the welding process and updating the welding process.