How to choose a household soldering iron
A constant temperature soldering iron
Constant temperature soldering iron is through the soft magnetic material and magnetic steel suction and separation, realize the automatic temperature control. Constant temperature soldering iron is generally 45W, intermittently energized and de-energized, the actual power consumption is 25W, using a transformer 24V power supply, AC and DC dual-use.
Soldering iron is a necessary tool when we carry out circuit welding, fully understand the working principle of the soldering iron, not only helps us to be able to better use the soldering iron, but also allows us to do a good job, not to have a dangerous generation.
Working Principle: When the temperature of the soldering head is below the constant temperature value, the magnetic temperature sensor connected to the end of the soldering head sucks the permanent magnet, so that the contacts on the magnet connecting rod are turned on, and the power supply is sent to the heating element, so that the temperature of the soldering head rises gradually. When the temperature is higher than the constant temperature, the heating element loses its magnetism, the power supply cuts off and stops heating. This week after week to make the power supply automatically connected or disconnected, warming and cooling, to maintain the soldering iron at a constant temperature. If you change the type of heating element, you can get different constant temperature values.
How to choose the soldering iron?
(1) Welding integrated circuits, transistors and their heat-prone components, consider the choice of 20W endothermic or 25W exothermic soldering iron.
(2) Welding thicker wires or coaxial cables, consider the choice of 50W endothermic or 45 ~ 75W external hot soldering iron.
(3) Welding larger components, such as metal chassis grounding pads, should be used more than 100W soldering iron.
(4) The shape of the soldering iron head should be adapted to the requirements of the surface of the welded parts and product assembly density.
Simply put, according to the welding object should be reasonable selection of the power and type of soldering iron, the soldered piece is larger, the use of the power of the soldering iron should be larger, if the power is small, the welding temperature is too low, the solder melting slower, the flux is not easy to evaporate, the solder joints are not smooth, not firm, which will inevitably result in the appearance of the quality and strength of the weld is unqualified, or even the solder can not be melted, the weld can not be carried out. But the power of the soldering iron can not be too large, too large will make too much heat transfer to the soldered workpiece, so that the components of the solder joints overheating may cause damage to the components, so that the copper foil of the printed circuit board off, the solder in the soldering surface flow too fast, and can not be controlled, and so on.
