Why can't I weld? How is the solder soldered?

The welding head needs to be cleaned to easily tin plate.

Dongsha should be used to clean welding objects.

For copper objects, it is relatively easy to weld, and rosin can be used to help weld; For iron, it is best to use solder water or flux, and for steel, only use hydrochloric acid water for welding.

Solder water and rosin are flux. When soldering the original circuit board, if solder liquid is used, spray it on the copper skin of the circuit board and then solder it with tin wire. If it is rosin, it will be more troublesome. Tin wire can be dipped in rosin with a soldering iron, and then welded with a soldering iron. Idea: After soldering, it depends on whether the tin spot is full and bright, and whether there is false welding or false welding.

It's actually quite simple. Use solder to occupy some rosin, then put the heated electric soldering iron close to the solder, and it will be faster to touch the parts to be soldered after the solder melts, so that the connection effect will be better. Some solders contain solder paste. Personally, I think it's better to dip some rosin.