Electric soldering iron power selection instructions
The excessive power of the soldering iron used can easily burn out components (usually when the junction temperature of the transistor exceeds 200 ℃) and cause printed wires to detach from the substrate; The power of the soldering iron used is too low, the solder cannot be fully melted, the flux cannot evaporate, the solder joints are not smooth and firm, and it is easy to produce virtual soldering. Generally, it is used for soldering integrated circuits, printed circuit boards, CMOS circuits, decorative transistors, IC recorders, televisions, and conducting ordinary circuit experiments. It is generally recommended to use 20W. For repairing vacuum tube machines such as gallbladder machines and old instruments, 35W is recommended. For external heating type machines, 45W is recommended. For soldering the wiring of large transformers and grounding main lines on metal substrates, internal heating type 50W and external heating type 75W are used. There are also some high-power applications.
There are various shapes of soldering iron tips, and the key to choosing them is to maintain a certain amount of solder regularly, quickly and effectively melt the solder on the joint, without producing virtual soldering, overlapping or hanging solder, with no burrs on the solder joints, and without damaging the board and components. If the solder joints on the machine are brand new and bright, the dipping section of the soldering iron tip can be larger. Use a flat or oval head for fast heat transfer and smooth operation. The tin oxide layer is thicker, and the soldering iron tip should be relatively pointed for easy breakthrough.
Due to the high density of electronic components, it is necessary to use corresponding sharp and thin iron alloy heads to avoid burns and soldering. Special shaped soldering iron tips are often used for assembling and disassembling IC blocks. Sometimes, due to the inability to weld and to avoid damaging plastic parts, a soldering iron tip is used. Of course, it also depends on each person's operating habits and preferences.
