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Time of issue:2020-07-15 00:00:00
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Reasons why PCBA processing plants use flux in wave soldering

(Summary description)Before introducing why PCBA processing plants use flux in wave soldering, let's briefly introduce flux. Flux is the main electronic auxiliary material used for PCBA processing in electronic assembly, and its quality directly determines the reliability of subsequent products. The following Sanjing belts let everyone briefly understand the reasons why PCBA processing plants use flux in wave soldering.
1. The use of flux can remove the rust film on the surface of the welded metal. The rust film on the surface of the welded metal is usually insoluble in any solution, but the rust chemically reacts with certain materials to form a compound that can be dissolved in the liquid booster, which can remove the rust film and purify the surface of the welded metal. This chemical reaction can cause the flux and the rust film to form another compound that is soluble in the flux or flux solvent, or it can be a chemical reaction that reduces the metal rust film to a pure metal surface...

Reasons why PCBA processing plants use flux in wave soldering

(Summary description)Before introducing why PCBA processing plants use flux in wave soldering, let's briefly introduce flux. Flux is the main electronic auxiliary material used for PCBA processing in electronic assembly, and its quality directly determines the reliability of subsequent products. The following Sanjing belts let everyone briefly understand the reasons why PCBA processing plants use flux in wave soldering.
1. The use of flux can remove the rust film on the surface of the welded metal. The rust film on the surface of the welded metal is usually insoluble in any solution, but the rust chemically reacts with certain materials to form a compound that can be dissolved in the liquid booster, which can remove the rust film and purify the surface of the welded metal. This chemical reaction can cause the flux and the rust film to form another compound that is soluble in the flux or flux solvent, or it can be a chemical reaction that reduces the metal rust film to a pure metal surface...

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Before introducing why PCBA processing plants use flux in wave soldering, let's briefly introduce flux. Flux is the main electronic auxiliary material used for PCBA processing in electronic assembly, and its quality directly determines the reliability of subsequent products. The following Sanjing belts let everyone briefly understand the reasons why PCBA processing plants use flux in wave soldering.

 

1. The use of flux can remove the rust film on the surface of the welded metal. The rust film on the surface of the welded metal is usually insoluble in any solution, but the rust chemically reacts with certain materials to form a compound that can be dissolved in the liquid booster, which can remove the rust film and purify the surface of the welded metal. This chemical reaction can cause the flux and the rust film to form another compound that is soluble in the flux or flux solvent, or it can be a chemical reaction that reduces the metal rust film to a pure metal surface. The fluxes belonging to the first chemical reaction are mainly represented by rosin-type fluxes. Examples of the second chemical reaction are certain reducing gases. For example, oxygen can reduce the oxides on the metal surface at high temperatures, generate water and restore a pure metal surface.

 

2. The use of flux can prevent secondary oxidation of the welded metal during heating. During wave soldering, as the temperature rises, the re-oxidation of the metal surface will increase. Therefore, the flux must provide protection for the purified metal surface, that is, the flux forms a thin film on the entire metal surface and coats the metal surface. It is isolated from the air, so as to prevent the secondary oxidation of the welded metal during the welding heating process.

 

 

3. The use of flux can reduce the surface tension of liquid solder. The flux in the soldering process can affect the energy balance of the surface by promoting the overflow of the solder, reduce the surface tension of the liquid solder, and reduce the contact angle.

 

Fourth, heat transfer. Generally, there are many gaps in the joints to be welded. During the welding process, the air in these gaps acts as a barrier, resulting in poor heat transfer. If you use flux to fill these gaps, you can accelerate the transfer of heat, and quickly reach thermal equilibrium.

 

5. Promote the overflow of liquid solder. After the preheated viscous flux comes into contact with the wave solder, the activity increases sharply, the viscosity drops sharply, and a second diffuse flow is formed on the surface of the welded metal, and it spreads quickly on the surface of the welded metal. The flow force formed by the secondary flux flow process is added to the liquid solder to drag the flow process of liquid metal.

 

Finally, add the flux coating process by the way. The flux coating system will automatically and efficiently apply the flux to the soldered surface of the PCB, use the flux to break the oxide layer of the soldered surface, and remove the loose oxide layer from the metal. The surface is removed so that the solder is in direct contact with the base metal.

 

These are the reasons why flux is used in wave soldering. Do you understand?

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