PCBA has poor wettability, please select the manufacturer?

PCBA has poor wettability, please select the manufacturer?
Inside PCBA Processing. When the surface tension of solder is damaged, it will lead to poor welding of surface mounted components The poor wettability is mainly manifested in that during the welding process, after the penetration of solder, there is no reaction between the solder area of the substrate and the metal, resulting in reduced welding or missing welding
The main reasons for poor wetting are:
1. The surface of the welding area is polluted, the surface of the welding area is polluted by flux, or metal compounds are produced on the surface of SMD components. It will cause poor wetting. For example, sulfide on silver surface and oxide on tin surface will lead to poor wettability.
2. When the residual metal in the solder exceeds 0.005%, the activity of the flux will be reduced and the wettability will be poor.
3. During wave soldering, there is gas on the surface of the substrate and it is easy to be poorly wetted.
The solutions to poor wetting include:
1. StrICtly implement the corresponding welding process.
2. Clean the surface of PCB board and components.
3. Select appropriate solder, and set reasonable welding temperature and time.
How to select PCB processing manufacturer
1. Factory specialization

First, it depends on whether the factory has professional equipment. The processing and production of PCBA requires very professional equipment, such as high-speed mounter, multi temperature reflow soldering, AOI detector, ICT online tester and other equipment, which are the basis of production. Whether there is professional process management or not, PCBA processing requires professional equipment, and quality is controlLED through professional process management. Generally speaking, a good PCBA manufacturer will pass the ISO9001 quality control system, IPC-A-610E electronic assembly acceptance standard and other certification. Whether there are SOP operation instructions and other files to guide employees' behavior. By checking the factory's data files and qualification certification, you can roughly understand the strength of the factory's quality control.
2. Service awareness
What PCBA does is not only products, but also services, handling services, pre-sales and after-sales services A PCBA proofread the manufacturer with a good sense of service can take the initiative to take responsibility when customers encoder problems, and quickly respond to customers Solve problems Therefore, a's service awareness PCBA proofreading manufacturers is very important Service awareness PCBA proofreading manufacturers can understand the company's corporate culture and the attitude of business personnel towards customers
3. Industry experience
In the context of the Sino US trade war, the PCBA industry is experiencing huge waves and scouring Some poorly managed PCBA processing manufacturers have begun to close down The years of industry experience reflects the PCBA manufacturers to a certain extent Secondly, it depends on whether the products manufactured are high-end, mid-range or low-end, and the field in which the products are manufactured It is used to determine whether it matches itself Only the right people are the best