PCBA Tech - PCBA poor wetting and choose a manufacturer?

In PCBA processing, when the surface tension of the solder is destroyed, it will cause poor soldering of surface mount components. The main manifestation of poor wetting is that during the soldering process, there is no reaction between the substrate solder area and the metal after the solder is infiltrated, resulting in less soldering or missing soldering.

The main causes of poor wetting are:

1. The surface of the welding area is contaminated, the surface of the welding area is stained with flux, or metal compounds are generated on the surface of the SMD component. Will cause poor wetting. Such as sulfide on the surface of silver and oxide on the surface of tin will cause poor wetting.

2. When the residual metal in the solder exceeds 0.005%, the flux activity will decrease and poor wetting will also occur.

3. During wave soldering, there is gas on the surface of the substrate, which is also prone to poor wetting.

The methods to solve poor wetting are:

1. Strictly implement the corresponding welding process.

2. The surface of the PCB board and components should be cleaned.

3. Choose suitable solder, and set reasonable soldering temperature and time.

How to choose a PCBA processing manufacturer

1. The degree of factory specialization

First of all, it depends on whether the factory has professional equipment. PCBA processing and production require very professional equipment, such as high-speed placement machine, multi-temperature reflow soldering, AOI detector, ICT online tester and other equipment, which are the basis of production. Whether there is professional process management, PCBA processing requires professional equipment, and professional process management to control quality. Generally, good PCBA manufacturers will pass ISO9001 quality management system, IPC-A-610E electronic assembly acceptance standards and other certifications, whether there are SOP job instructions and other documents 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 consciousness

What PCBA does is not only products, but also services, processing services, pre-sales and after-sales services. A PCBA proofing manufacturer with a good sense of service can take the initiative to take responsibility when customers encounter problems, and respond quickly to their customers. Solve the puzzle. Therefore, the service consciousness of a PCBA proofing manufacturer is very important. The service awareness of PCBA proofing manufacturers can be understood by understanding the company's corporate culture and the attitude of the business personnel to customers.

3. Industry experience

In the general environment of the Sino-US trade war, the PCBA industry is experiencing big waves and scouring. Some poorly managed PCBA processing manufacturers have begun to close down one after another. Having many years of industry experience reflects the strength of a PCBA manufacturer to a certain extent. Secondly, it depends on whether the manufactured product is high-end, mid-range or low-end, and which field of product is manufactured. It is used to judge whether it matches with itself. Only the right one is the best.