Which products are suitable for laser welding?

Laser welding is one of the important aspects of the application of laser material processing technology, and it is also often called laser welding machine and laser welding machine. According to its working mode, it can be divided into laser mold welding machine (manual welding machine), automatic laser welding machine, laser spot welding machine and optical fiber transmission laser welding machine. Optical welding is to use high-energy laser pulses to locally heat the material in a small area, and the energy radiated by the laser diffuses into the material through heat conduction, so that the material melts to form a specific molten pool to achieve the welding purpose.

First, the main characteristics of laser welding.

In 1970s, it was mainly used for welding thin-walled materials and low-speed welding. The welding process belongs to heat conduction type, that is, laser radiation heats the surface of the workpiece, and the surface heat diffuses to the inside through heat conduction. By controlling laser pulse width, energy, peak power and repetition frequency, the workpiece is melted and a specific molten pool is formed. Because of its unique advantages, it has been successfully applied to precision welding of micro parts.

The appearance of high-power CO2 and high-power YAG lasers has opened up a new field of laser welding. Deep penetration welding based on pinhole effect has been obtained and widely used in machinery, automobile, steel and other industrial fields.

Compared with other welding technologies, the main advantages of laser welding are:

1, with high speed, large depth and small deformation.

2, welding can be carried out at room temperature or under special conditions, and the welding equipment is simple. For example, when the laser passes through the electromagnetic field, the beam will not deviate; Laser can be welded in vacuum, air and a certain gas environment, and can be welded through glass or materials transparent to the light beam.

3. It can weld refractory materials such as titanium and timely. It can weld anisotropic materials with good effect.

4. After laser focusing, the power density is high. When welding high-power devices, the depth-width ratio can reach 5: 1, and the highest can reach 10: 1.

5, micro welding can be carried out. After the laser beam is focused, a small spot can be obtained and accurately positioned, which can be applied to the assembly and welding of tiny workpieces in mass automatic production.

6. It can weld inaccessible parts and realize non-contact long-distance welding with great flexibility. Especially in recent years, YAG laser processing technology has adopted optical fiber transmission technology, which makes laser welding technology more widely popularized and applied.

7. The laser beam is easy to split according to time and space, and multiple beams can be processed at multiple stations at the same time, which provides conditions for more accurate welding.

However, laser welding also has some limitations:

1, which requires high assembly accuracy of weldments, and the position of the light beam on the workpiece cannot be obviously shifted. This is because after laser focusing, the spot size is small, the weld is narrow and full of metal materials. If the assembly accuracy of the workpiece or the positioning accuracy of the beam can not meet the requirements, it is easy to cause welding defects.

2. Laser and its related systems have high cost and large one-time investment.