What is the role of flux in second-hand Yamaha chip machining? I believe that everyone does pay much attention to these issues in daily life, so the following editors Shenzhen second-hand Yamaha chip mounter manufacturers will explain in detail for everyone.

为了 In order to obtain a good no-clean effect in second-hand placement machine processing, two parameters must be strictly controlled, namely the solid content of the flux the amount of coating. The main functioning component of the flux is rosin. Rosin will decompose at about 280 degrees Celsius, so the temperature of the tin furnace should be too high. Flux is a chemical that promotes soldering. It is an indispensable auxiliary material in soldering, its role is extremely important.

物理 The physical properties of flux in second-hand Yamaha chip machining mainly refer to the melting point, boiling point, softening point, glass transition temperature, vapor pressure, surface tension, viscosity, miscibility, etc. related to welding performance.

作用 The role of flux has the following four points:

1. It should have good thermal stability. Generally, the thermal stability temperature is less than 100 ℃.

2. The flux should have an appropriate active temperature range. It starts to function before the solder is melted, plays a role in removing the oxide film reducing the surface tension of the liquid solder during the soldering process. The melting point should be lower than the melting point of the solder, but should differ too much;

3. The density of the flux should be less than the density of the liquid solder, so that the flux can spread evenly on the surface of the metal to be welded, covering the surface of the solder the metal to be welded in a thin film, effectively isolating the air, promoting the solder to the base metal. wet;

4. The residue after welding should be corrosive easy to clean; toxic harmful gases should be precipitated; water-soluble resistance insulation resistance in accordance with the electronics industry regulations; no moisture absorption, no mold; stable chemical properties, easy to store .