What are the benefits of using rosin when soldering?

1. With rosin, solder joints will be beautiful some, with solder paste solder joints will be black.

2. Welding circuit boards is best with rosin welding, because rosin is a flux. But not too much, there is a little on the line, beginner maintenance will not grasp the position, often weld a weld on the good, tin point can not be too big, can not be too small, look at the circuit board on the soldering point. Now are the machine welded boards, individual with artificial welding, welding places are more current and high voltage places. Please look at the old electronics or old black and white TV sets welded by hand. Not good-looking, but solid. No open welds. The late eighties are basically machine soldering, also called wave soldering, fast and good, but the current is a little more open welding more places. Solder paste is only used when soldering difficult to tin iron and other items, corrosive, generally only use rosin on the line, rosin's role is to precipitate the oxides in the solder, to protect the solder from oxidation, to increase the fluidity of the solder.

3. Electronic components are generally good on the tin, if rust to scrape the first bright, put the rosin with a soldering iron on the hot, and then on the tin. Circuit boards can be directly inserted after scraping the tinned components have been soldered with rosin core solder wire. Remove the iron before the rosin evaporation is complete, if the solder is sticky to dip a little more rosin, do not move the components before the solidification of the solder.