The solder wire is composed of a solder alloy and a flux. When the solder wire is melted by electrochromic iron, chemical changes occur with the flux. The generation of fumes is the process of heating and evaporation of the flux. Some people will say that Isn't there no fumes if the flux is not added? The answer is that the solder wires without the fumes will not generate fumes. But the problem solder wire is not enough tin without flux. This is a question of spears and shields.
How to reduce the fumes of solder wire:

The solder wire's flux is irreplaceable, so we will improve the technology from the flux. Smoke will definitely be there but we can weaken it. The flux content of the conventional solder wire is 2.2%. We did a test. The higher the flux content, the more smoke it generates. When we reduce the flux content, its smoke decreases but new problems appear.

The solderability of the solder wire is also weakened. The method we have to deal with is to improve the activation performance, wetting performance and expansion properties of the flux. From the experiment, we can conclude that the soldering performance of the solder wire with a low content of flux has not weakened There is also improvement, but its smoke has been reduced a lot. There is also no change in the production cost of solder wire.