PCB Technical - PCB circuit board welding skills

PCB circuit board welding skills
At present, the pace of industrialization in our country is accelerating. It can be said that PCB circuit boards are used in many fields. Whether it is in life or industry, PCB circuit boards can be seen everywhere, but since it comes to the use of PCB circuit boards Extensive, so I have to mention PCB soldering. What are the PCB soldering skills? Today we will use the following content to understand the relevant introduction of soldering PCB circuit board skills.

1. The selective soldering process includes: flux spraying, PCB circuit board preheating, dip soldering and drag soldering. Flux coating process In selective soldering, the flux coating process plays an important role. At the end of the soldering heating and soldering, the flux should have sufficient activity to prevent the generation of bridges and prevent the PCB circuit board from oxidizing. Flux spraying is carried by the X/Y manipulator to carry the PCB circuit board through the flux nozzle, and the flux is sprayed onto the soldering position of the PCB circuit board.
2. After the reflow soldering process, the most important thing for microwave peak selective soldering is the accurate spraying of the flux, and the micro-hole jet type will never contaminate the area outside the solder joints. The minimum flux point pattern diameter of micro-point spraying is greater than 2mm, so the position accuracy of the sprayed flux deposited on the PCB circuit board is ±0.5mm to ensure that the flux is always covered on the welded part.

3. The process characteristics of selective soldering can be understood by comparison with wave soldering. The most obvious difference between the two is that the lower part of the PCB circuit board in wave soldering is completely immersed in liquid solder, while in selective soldering, only part of it The specific area is in contact with the solder wave. Since the PCB circuit board itself is a poor heat conduction medium, it will not heat and melt the solder joints of the adjacent components and the PCB circuit board area during soldering.
The flux must also be pre-coated before soldering. Compared with wave soldering, the flux is only applied to the lower part of the PCB circuit board to be soldered, not the entire PCBPCB circuit board. In addition, selective soldering is only suitable for the soldering of plug-in components. Selective soldering is a brand new method. A thorough understanding of selective soldering processes and equipment is necessary for successful soldering. At present, the country has higher and higher requirements for environmental protection and greater efforts in link governance. This is a challenge but also an opportunity for PCB factories. If PCB factories are determined to solve the problem of environmental pollution, then FPC flexible circuit board products can be at the forefront of the market, and PCB factories can get opportunities for further development.
The Internet era has broken the traditional marketing model, and a large number of resources have been gathered together to the greatest extent through the Internet, which has also accelerated the development speed of FPC flexible circuit boards, and then as the development speed accelerates, environmental problems will continue to appear in PCB factories. In front of him. However, with the development of the Internet, environmental protection and environmental informatization have also been developed by leaps and bounds. Environmental information data centers and green electronic procurement are gradually being applied to the actual production and operation fields.