Small experience in using electric soldering iron
.When you start using a new electric soldering iron, you should remove the oxide film from the tip of the soldering iron first. After the power is turned on, when the soldering iron is hot, put the soldering iron in rosin or hydrochloric acid for a while. After white smoke is emitted, take it out, dip it in solder, and then use it. . The object to be welded should be polished with sandpaper to remove dust.
