Zichen has developed solutions for laser tin ball welding nozzles

At present, laser has been widely used in industrial production, especially for welding, cutting, punching, marking and surface treatment of metals. Laser welding technology is gradually replacing the traditional welding technology, which mainly benefit from the laser welding in production has the characteristics of fast welding speed, easy to be guided by the optical system, high precision, small deformation, low thermal stress to the workpiece and so on. Laser spray ball welding is a new soldering process in laser welding. The main advantage of this process is that the interconnection can be achieved at a very small size, the size of the droplet can be as small as tens of microns. The tin ball in the container can be transferred to the nozzle through the special single-tin bead ball parting system, and the high pulse energy of the laser can melt the tin ball placed on the nozzle instantly, and then the inert gas pressure can be used to spray the melted tin material to the surface of the solder joint to form the interconnected solder joint.

However, the traditional solder nozzles on the market are relatively simple in function and very inconvenient to use. The traditional solder nozzles generally have the disadvantages of high cleaning frequency and short service life. Zichen Laser is one of the earliest laser soldering equipment manufacturers in China. In order to solve the problem of traditional welding nozzles, Zichen Laser provides an application solution of laser tin ball welding nozzles after years of research and development.

Laser soldering machine nozzle toward one end of the product to be processed, the size of the nozzle is slightly less than the size of the tin ball, so that the nozzle nozzle can jam the tin ball, in the nozzle alignment to be processed products need to be welded after the position, through the laser to liquefy the tin ball, and fall on the product to be processed, welding. In the related technology, part of the liquefied tin is prone to sputtering or remaining on the inner wall of the nozzle during the process of liquefaction of the tin ball, causing the loss of the tin ball. In addition, after cooling, the liquefied tin will re-solidify and remain on the inner wall of the nozzle for a long time, which will lead to a certain deviation in the positioning of the next tin ball. Thus increasing the cleaning frequency of the welding ball nozzle, from a certain definition, the finer the tin ball nozzle, the higher the cleaning frequency will be.

The laser tin ball nozzle comprises a body, the inner hollow of the body, forming a goal channel, the body corresponding to the goal channel at one end of the nozzle, the goal channel is used to transmit the tin ball to the nozzle, the nozzle is used to jam the tin ball; The body is formed with an inclined surface, the inclined surface extends from the outer wall of the body to the part of the inner wall of the body corresponding to the nozzle, so that the inner wall forms a gap, when the nozzle stuck the tin ball, the gap makes the tin ball part exposed, used to reduce the contact area between the inner wall of the body and the tin ball.

The high precision laser tin ball nozzle according to the technical embodiment has at least the following beneficial effects: The inclined plane extends from the outer wall of the body to the inner wall of the nozzle, so that the inner wall of the nozzle forms a notch. When the nozzle is stuck on the tin ball, the tin ball is partially exposed through the gap to reduce the contact area between the tin ball and the inner wall of the body. Thus, when the tin ball is liquefied, it can reduce the amount of liquefied tin sputtering or residual tin on the inner wall and reduce the loss of the tin ball.

Advantages of tin ball laser welding machine
1. Laser heating and melting process is fast, which can be completed within 0.2s;
2. The tin ball is melted in the welding nozzle without spatter;
3. No flux, no pollution, maximize the life of electronic devices;
4. The diameter of the laser injection tin ball can realize the welding of various large balls and small balls between 0.06-2mm, in line with the development trend of integration and precision;
5. Different solder joints can be welded through the selection of the size of the tin ball;
6. Stable welding quality, high yield; With CCD positioning system suitable for mass production line demand.

Source: Zichen Laser