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What is the function of flux?
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Release Date:
2023-01-10
Soldering flux The development prospects for this industry are very promising, as its use delivers numerous benefits to enterprises, making it highly favored by customers. To help everyone become more familiar with it, understand its daily applications, and better leverage its advantages for businesses, we will now proceed to discuss… Soldering flux Small, relevant insights into its function—hopefully they will help more people and maximize the benefits it delivers.
Soldering flux Remove oxides from the welding surface to lower the melting point and surface tension of the solder, thereby enabling the brazing temperature to be reached as quickly as possible. Protect the liquid solder metal from the harmful gases in the surrounding atmosphere. Ensure that the liquid solder flows at an appropriate rate to fully fill the joint. The role of flux in submerged-arc welding: mechanical protection: the flux in the electric arc… Use It melts on the surface to form slag, which protects the weld metal in its liquid state from atmospheric gases entering the molten pool, thereby preventing porosity in the weld. Welding involves adding the necessary metallic elements to the molten pool.
To ensure a smooth, straight weld surface and good bead formation, the flux should have a melting point lower than that of the solder. 10–30°C In special cases, the melting point of the flux may also be higher than that of the solder. If the flux’s melting point is significantly lower than the solder’s, it will melt prematurely, leading to the loss of flux activity due to evaporation and interaction with the base metal as the solder melts. The selection of a flux typically depends on the nature of the oxide film. Soldering flux of Alkaline oxide films, such as: Fe 、 We 、 Cu Oxides of rare earth elements often use boron trioxide ( B2O3 ) of acidic flux, and acidic oxide films, if they contain high SiO2 The oxide film on cast iron is often treated with an alkaline solution. Na2CO3 Flux preparation produces a low-melting substance. Na2SiO3 and enter the slag. Certain fluoride gases are also commonly used as fluxes. They react uniformly and leave no residues after welding. BF3 Usually associated with N2 Mixed for high-temperature brazing of stainless steel. Soldering flux Used for 450°C The following brazing fluxes are fluxes, and they are divided into two types. One type is water-soluble, typically composed of a single chloride or phosphate, or Sog The aqueous solution of salt has high activity and excellent corrosion resistance. It exhibits strong resistance, but must be cleaned after soldering. Another type is a water-insoluble organic flux, typically formulated with rosin or synthetic resins as the base, to which organic acids, organic amines, or their Hydrochloric acid or Hydrogen bromide Salt is added to enhance membrane removal efficiency and activity.
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