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Solder and flux
Jun 16, 2017

1. The composition of the brazing filler metal and the base metal

If the brazing filler metal and the base metal in the solid and liquid do not occur under the physical and chemical effects, then the wetting effect between them is poor, such as lead and iron. If the brazing filler metal and the base material can dissolve or form a compound, it is considered that the brazing filler metal can better wet the base material, for example, silver to copper.

2. Brazing temperature

Brazing heating temperature increases, due to solder surface tension and other reasons will improve the brazing filler metal on the base material, but the brazing temperature can not be too high, otherwise it will cause the loss of solder, grain growth and other defects.

3. Base metal surface oxide

The If the parent metal surface oxide, liquid solder often condense into a spherical, not with the parent material wetting, so brazing must be fully removed before the oxide, in order to ensure good wetting effect.

4. Base material surface roughness

When the role of the brazing filler metal and the base metal is weak, the base material rough surface of the groove played a special capillary effect, can improve the brazing filler metal in the base metal wetting and spreading.


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