PCB Tech - What is the main reason for poor wetting caused by SMT processing

What is the main reason for poor wetting caused by SMT processing
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.

Next, the editor will explain to you what is the main reason for poor wetting in the SMT processing of the smt factory?

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.
The above is the relevant content of the main reason for poor wetting caused by the smt factory in SMT processing, I hope it will be helpful to everyone!
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.
iPCB is happy to be your business partner. Our business goal is to become the most professional prototyping PCB manufacturer in the world. With more than ten years of experience in this field, we are committed to meeting the needs of customers from different industries in terms of quality, delivery, cost-effectiveness and any other demanding requirements. As one of the most experienced PCB manufacturers and SMT assemblers in China, we are proud to be your best business partner and good friend in all aspects of your PCB needs. We strive to make your research and development work easy and worry-free.

quality assurance

iPCB has passed ISO9001:2008, ISO14001, UL, CQC and other quality management system certifications, produces standardized and qualified PCB products, masters complex process technology, and uses professional equipment such as AOI and Flying Probe to control production and X-ray inspection machines. Finally, we will use double FQC inspection of appearance to ensure shipment under IPC II standard or IPC III standard.
We are not an agent

Our factory is located in China. For decades, Shenzhen has been known as the world's electronics R&D and manufacturing center. Our factory and website are approved by the Chinese government, so you can skip the middlemen and buy products on our website with confidence. Because we are a direct factory, this is the reason why 100% of our old customers continue to purchase oniPCB.

No minimum requirements

You can order as little as 1 PCB from us. We will not force you to buy things you really don't need to save money.
Free DFM

Before you pay in the most timely manner, all your orders will receive free engineering document review services by our well-trained professional and technical personnel.