Must soldering flux be used in soldering test?
The flux is mainly used for surface treatment, which is somewhat similar to mending the tires first, or it will not stick.
As far as I know, it's necessary. There is a kind of soldering flux in the middle of tin wire, and one kind of soldering flux without soldering flux. It needs additional rosin or soldering paste when soldering.
If you use tin wire, tin wire solder test, of course, do not add, unless the pad is particularly strong oxidation, or iron and other unconventional pads. Of course, there are about 2% solid flux in the tin wire except the special onesSweet words unless you board itself precoated flux or no flux is not on the tin.SMT surface mount solder furnace, without flux itself is a mixture of spherical powder with solder paste fluxWe can see it in SINOSMT's informationThe main functions of soldering flux are:1. Remove the oxide film on the welded metal surface;2, on the surface of the welding to form a liquid protective film, isolated from high temperature air around, to prevent the metal surface reoxidation3, reduce the surface tension of solder and increase its diffusion ability;4, welding instant, can let melt solder replace, finish welding smoothly.
