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Does the solder flux need to be cleaned during the soldering process?

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Update time : 2022-11-30 15:12:13
Nowadays, many people report that a lot of welding slag appears in the welding process, but it is not easy to clean. I don’t know if it is a problem with the product itself. Generally, the solder flux (paste) cannot be completely volatilized during the welding process, and there will be residues left on the board. superior. As for whether the residue needs to be removed in the cleaning area, it needs to be comprehensively considered according to the quality of the selected solder flux, product requirements, and production costs. Therefore, you still need to pay attention to these. The following solder paste manufacturers make up Let's talk about:
First of all, we need to understand the concepts of cleaning and no-cleaning. It is said in the industry that no-cleaning solder flux means that there is no need to clean after the wave crest, and it will not cause electrical performance problems. The substances are piled up together, which is easy to produce white residue, which is the reaction product of solder flux and solder, such as lead oxide or bromide. If you are making semi-finished products, and the customer requires PCBA not to see the residue, then it needs to be cleaned, and it must be cleaned when cleaning. The phenomenon of conduction and white residue after washing is caused by not cleaning. The cleaning of washable solder flux can be roughly divided into the following two categories:
1. Manual cleaning
Use hand tools to clean residual solder flux and dirt from solder joints. The manual cleaning method is suitable for all kinds of solder joints. The method is simple and the cleaning effect is good, but the efficiency is low. Commonly used tools for manual cleaning include brushes, brushes, tweezers, cotton yarn, etc. Pay attention to the following points when cleaning:
1. Do not damage the solder joints and components, and the cleaning action should be light. Do not twist or pull the wires on the solder joints or the leads of components.
2. The cleaning liquid should not be scattered. Do not use excessive cleaning liquid to prevent the cleaning liquid from flowing inside the product and reduce the performance of the product.
3. When the cleaning solution becomes dirty, it should be replaced in time. Cleaning fluids are usually flammable chemicals, so be careful with fire prevention when using them.
2. Ultrasonic cleaning
Ultrasonic cleaning is a method of cleaning by using the cleaning effect generated by high-frequency oscillation of ultrasonic waves, and there is an ultrasonic cleaning agent.
Finished cleaning method. The principle is: the cleaning liquid produces a cavitation effect under the action of ultrasonic waves, and the high-intensity shock wave generated by the cavitation effect makes the dirt on the welding points and in the crevices come off, and can accelerate the process of the cleaning liquid dissolving these dirt. The characteristics of the ultrasonic cleaning method are: fast cleaning speed, good cleaning quality, can clean complex welded parts and dirt in gaps, and is easy to realize cleaning automation. The effect of ultrasonic cleaning is related to many factors, mainly including ultrasonic frequency, sound intensity, nature of cleaning fluid, temperature and cleaning time.
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