Application of potassium fluoaluminate (potassium cryolite) in aluminum solder paste.

Aluminum and aluminum, aluminum and aluminum alloy, aluminum, stainless steel, aluminum, copper and other metal welding is widely used in aerospace, between air conditioning manufacturing, electric appliances, composite stainless steel tableware, etc. Used by traditional aluminum soldering welding materials for solder powder and powder, filiform, solder foil shape, flake, etc. With the continuous miniaturization of volume welding, weld shape diversification as well as industrial automation degree unceasing enhancement, the traditional welding material can not meet the requirements of welding technology, the emergence of the solder paste has become a new bright spot of modern welding industry.
Welding with solder paste has the following advantages :(1) it is convenient for precise fabric, especially for irregular welding seams;
(2) the ratio of the flux and solder is accurate;
(3) the process of feeding is suitable for the production of industrial automation.
Is usually used for aluminium and aluminium alloy welding flux of solder paste can be used in the fluoride potassium aluminate soldering flux, temperature fluorine aluminate soldering flux, modified fluoride potassium aluminate solder (AlF32KF2ZnF22SnF4 series), and other non-corrosive solder. Used in the preparation of aluminium soldering paste soldering flux should satisfy the following conditions: at room temperature, flux not moisture absorption or weak absorption of moisture, no corrosion;
Under normal temperature, the flux and solder can coexist, and the chemical property is stable.

The particle size of the flux is less than 74 mu m.