When soldering something with an electric soldering iron, why is it even harder to solder with rosin?
(1) It is said that rosin is a flux. When I solder something with an electric soldering iron, why can't I use rosin to solder? And when I don't use rosin, the solder is stronger.
(2) Will using 75% alcohol to clean the circuit board cause certain harm? Is the tin absorber used when the soldering iron is hot? How to prevent the electric soldering iron from turning black and oxidized?
The first situation you mentioned is possible, but it is not a common phenomenon, otherwise there would be no such thing as rosin fluxing. It is mainly related to whether the temperature of the electric soldering iron is suitable (the optimum temperature is 240-250°C), the severity of oxidation of the contact surface, and the quality of the solder wire.
It is no problem to use 75% alcohol to clean the circuit board. Do not charge the circuit board. It should be cleaned or dried in time. Some will leave a slight white mark, which will not affect the use. The tin absorber is used when the solder joint is melted, and it must be well coordinated and fast.
Oxidation of the soldering iron after a long time of use is a normal phenomenon. Hang some tin when not in use, so as to keep the end face not easy to oxidize. The futures part can be polished. If you have a lot of work, you can use an electric soldering station and a temperature-adjustable electric soldering iron to avoid long-term high-temperature oxidation and blackening.
Soldering iron power
The power of the electric soldering iron used is too large, it is easy to burn the components (generally, when the junction temperature of the diode and triode exceeds 200°C, it will burn out) and the printed wires will fall off the substrate; the power of the soldering iron used is too small, and the solder cannot Fully melted, the flux cannot be volatilized, the solder joints are not smooth and firm, and it is easy to produce false welding. -Generally, the power of the electric soldering iron used for welding integrated circuits and printed lines is too large, which is easy to burn components (generally, when the junction temperature of the diode and triode exceeds 200°C, it will burn out) and the printed wires from The substrate falls off; the power of the soldering iron used is too small, the solder cannot be fully melted, the flux cannot be volatilized, the solder joints are not smooth and firm, and it is easy to produce false soldering. -Generally, it is used for welding integrated circuits, printed circuit boards, CMOS circuits, decoration transistors, IC recorders, TV sets, for ordinary circuit experiments, generally 20W is appropriate, and for repairing vacuum tube machines, such as amplifiers, old-fashioned 35W is suitable for the instrument, 45W for the external heating type, 50W for the internal heating type and 75W for the external heating type for welding the wiring of the large transformer and the grounding trunk line on the metal base plate. If you want to weld metal materials, you should use an external heating electric soldering iron above 100W. If conditions permit, amateur radio enthusiasts can be equipped with a 2OW internal heating type, a 35W internal heating or external heating type, and a 150W external heating type electric soldering iron, so that it can basically meet various welding needs.
