What issues need to be addressed while utilizing soldering iron welding for maintenance?
1. Selection of electric soldering iron
There are many types and specifications of electric soldering irons, and the size and requirements of the electronic components to be soldered are different. Therefore, the reasonable selection of the power and type of the electric soldering iron has a direct relationship to improving the welding quality and efficiency. During the soldering process, heat is provided by a soldering iron. Only when the solder joint absorbs enough heat so that the temperature of the soldering area melts the solder and the flux is well volatilized, can there be a firm and smooth solder joint. If the power of the electric soldering iron is too large, too much heat will be transferred to the welding workpiece, and the overheating of the solder joints of the components will cause damage to the components, and welding defects such as copper peeling off of the printed circuit board.
In actual use, special care should be taken not to think that the lower the power of the soldering iron, the less likely it will be to burn components. Take welding a high-power triode as an example. If a low-power electric soldering iron is used, it cannot supply enough heat quickly after it contacts with the component. On the triode, it is very easy to make the temperature of the die reach the level of damage.
When soldering various components, you can refer to the following table to select the configured electric soldering iron.
1. General printed circuit board, installation wire: 250℃~350℃, 20W internal heating type, 30W external heating type.
2. Integrated circuit: 250℃~350℃, 20W internal heat type, constant temperature type, energy storage type.
3. Solder lugs, potentiometers, 2~8W resistors, high-power tubes: 350℃~450℃, 30~50W internal heating type, temperature adjustment type 50~75W external heating type.
4. Larger components such as large resistors above 8W, wires above 2A: 400℃~550℃, 100W internal heating type, 150~200W external heating type.
5. Metal plates, etc.: 500℃~630℃, external heat or flame soldering above 300W.
6. Maintenance and debugging of general electronic products: 250℃~350℃, 20W internal heat type, constant temperature type, induction type, energy storage type, dual-purpose type.
2. Precautions for using electric soldering iron
1. When the electric soldering iron is not used for a long time, the power should be turned off in time. To avoid accelerated oxidation of the soldering iron core and shorten the service life;
2. Before turning off the soldering iron, tin the tip of the soldering iron. To protect against accelerated oxidation.
3. Common faults and maintenance of electric soldering irons. The common faults of electric soldering irons are: the electric soldering iron does not heat up after being energized, the soldering iron tip does not "eat" tin, and the soldering iron is charged, etc. Now take the internal heating 20W electric soldering iron as an example to illustrate.
