PCB Technical - The quality and development of PCB SMT solder joints

How to ensure the quality of solder joints has become a key issue for high-precision PCB dense placemen t. PCB solder joints are used as a bridge for soldering, and its quality and stability determine the quality of electronic equipment. In other words, in the process of processing, the quality of SMT patch processing is ultimately manifested as the quality of solder joints.

1. Judgment of PCB virtual soldering

1. Use professional online tester equipment for testing.

2. Visual inspection or AOI inspection. When you find that the solder joints have too little solder material, the solder penetration is poor, or there are cracks in the middle of the solder joints, or the surface of the solder is convex spherical, or the solder does not melt with the SMD, etc., you need to pay attention to it, even if it is a slight condition Causes hidden dangers, it should be immediately judged whether there is a lot of false welding problem. The method of judgment is: to see if there are many solder joints at the same position on the PCB, such as the problem on some PCBs, it may be due to scratching of the solder paste, pin deformation, etc., such as on many PCBs. There is a problem with the same position. At this time, it is likely to be caused by a bad component or a problem with the pad.

Second, the reason and solution of PCB virtual soldering

1. The pad design is defective. The existence of through-holes in the pads is a major disadvantage of PCB design. If it is not necessary, it is not necessary to use them. The through-holes will cause the loss of solder and lead to insufficient soldering materials. The spacing and area of the pads also need to be standardized, otherwise the design should be corrected as soon as possible.

2. The PCB board is oxidized, that is, the pad is black and does not shine. If there is oxidation, you can use an eraser to remove the oxide layer to make it bright again. If the PCB board is damp, it can be dried in a drying box if suspected. The PCB board has oil stains, sweat stains and other pollution, so use absolute ethanol to clean it up.

3. For PCBs that have been printed with solder paste, the solder paste is scraped and rubbed, which reduces the amount of solder paste on the relevant pads and makes the soldering material insufficient. Should be added immediately. You can use a dispenser or use a bamboo stick to pick a little supplement

PCB demand high growth, the future will focus on high-end HDI and packaging substrates

The server PCB market continues to expand. The future revenue of communication board business manufacturers is considerable. It is recommended to pay attention to PCB technology involved in 5G base stations and terminals.

The electrification and intelligence of automobiles bring new growth space to the automotive PCB market.

In 2018, the output value of automotive PCB was 7.6 billion U.S. dollars. It is estimated that the global automotive PCB output value will reach 10.171 billion U.S. dollars in 2023, with a CAAGR of 6%. It is estimated that in 2023, the PCB output of traditional fuel vehicles will drop to US$4.149 billion, with a CAAGR of -5%; the new PCB output value of automotive electrification will be US$5.437 billion, and the CAAGR will be as high as 23.61%; the new PCB demand for automotive intelligent networking will be 5.85 Billion US dollars, CAAGR is 10.54%. The production threshold for safety automotive panels is relatively high, and competition in the domestic market is relatively small. Therefore, manufacturers have huge potential for profit in the future.

In recent years, consumer electronics have continued to innovate, creating new growth space for consumer electronics PCBs.

According to Prismark's statistics, the output value of PCB for consumer electronics in 2018 was 24.171 billion U.S. dollars, and it is expected to reach 28.87 billion U.S. dollars in 2022, with a CAAGR of 4.2%. In the segmented field, the smart wearable device market has shown explosive growth, with shipments of 135 million units in 2018 and 205 million units in 2023, with a CAAGR of 23% from 2018 to 2023, driving FPC demand growth. 5G will also become a new growth point for smartphones. It is estimated that 5G mobile phone shipments will reach 725 million units in 2023, driving the demand for high-end PCB boards such as SLP and high-end HDI. The revenue of manufacturers with FPC as their main business and with SLP and high-end HDI production capabilities will usher in new growth. Major domestic FPC manufacturers and PCB electronics with potential low-volume high-end HDI mass production capabilities.

China currently focuses on low-end products and is expected to achieve domestic substitution in the high-end product market. The future development prospects of high-end PCB product manufacturers are good.

The global high-end PCB product market is dominated by overseas companies, but due to trade frictions and strong demand from China's independent electronic brands, the market prospects for China's high-end PCB manufacturers are promising. By broadening financing channels, increasing investment in production research and development, and continuing to expand production capacity, leading domestic PCB companies will continue to increase their market share in the global high-end PCB product market.