Solder Solidus Temperature

The solidus temperature is the temperature at which the solder just begins to melt when heated. Below it, it stays solid; above it, it becomes mushy and eventually liquid. If you don't get hot enough during welding or brazing, the solder won't wet properly and the joint won't hold. But if you overheat it too much, the solder can run out or the base material can be damaged. So adjust the heat input to the solder and make sure it flows cleanly and evenly.