¡¡¡¡ There are hard soldering flux and soft soldering flux, which can form residue and gas to protect metal and alloy.
¡¡¡¡ Soldering flux can be any substance that can lower the surface tension between material and soldering material, including fused salt, organic matter, active gas and metal vapors, etc.
It should offer 3 functions£º
1, removing oxide on the surface and lower the surface tension between material and soldering material
2, protecting welding metal from harmful gas when it is in liquid state
3, offering proper flow speed to fill soldering slot
¡¡¡¡ The melting point of flux should be 10-30 degree C less than that of soldering material
¡¡¡¡ The properties of oxidization film can be used to select flux.
¡¡¡¡ With even reaction and no residue, fluoride gases also can be used as flux
¡¡¡¡ Soft soldering fluxes are mainly used in place under 450 degree c, it includes two types: water soluble type and water insoluble organic flux. |
