English 
Flux is an important auxiliary material in electronic welding. Its purpose is to remove the oxide layer on the surface of the workpiece and improve the fluidity of the solder. But at the same time, the flux volatilizes very quickly at high temperature, so it is necessary to correctly grasp the time when soldering. This video shows us the effect of different welding times on welding, I hope it will be helpful to everyone. The video is from Androkavo's demo.
