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Precise application of laser welding machine in Microelectronics

22-06-2022

Precise application of laser welding machine in Microelectronics


Laser welding machine is one of the welding equipment and one of the welding methods that have been applied and developed in recent years. Laser welding uses high-energy laser pulses to locally heat the small area of the workpiece. The energy radiated by the laser is guided to the internal diffusion of the workpiece through heat transfer, and the workpiece is melted to form a specific molten pool. Because the laser welding power density is high and the energy is released quickly, Therefore, the machining efficiency is much higher than the traditional welding method. After the laser is focused, the spot is small. During the welding process, the adhesion between the two materials can be better without causing damage and deformation on the surface of the material, and there is no need to carry out post-treatment on the weld.

 

Laser welder has been widely used in electronic industry, especially in microelectronic precision parts. Due to the small heat affected zone, rapid heating concentration and low thermal stress, laser welding shows unique advantages in the packaging of integrated circuits and semiconductor device shells. The thickness of the elastic thin-wall corrugated sheet in the sensor or temperature controller is 0.05-0.1mm, which is difficult to be solved by traditional welding methods. TIG welding is easy to be penetrated, the plasma stability is poor, and there are many influencing factors, so the effect of laser welding is very good, It has been widely used.

 

Main advantages of laser welding tools for precision parts

 

1. the laser for precision parts welding can be bent and transmitted through optical methods such as optical fiber and prism, which is applicable to the welding of micro parts and other parts that are difficult to reach by welding methods, and can also be welded through transparent materials.

 

2. with high energy density, high-speed welding can be realized, and the heat affected zone and welding deformation are very small, especially suitable for the welding of heat sensitive materials.

 

3. the laser welding sysem used for welding precision parts is not affected by electromagnetic field, does not produce X-rays, and does not need vacuum protection. It can be used for welding large structures.

 

4. the insulating conductor can be directly welded without stripping the insulating layer in advance; It can also weld dissimilar materials with great differences in physical properties.


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