Normal use of the soldering iron and common troubleshooting methods
1, external heat type soldering iron generally by the iron head, iron core, shell, handle, plug and other parts of the composition. The iron head is installed in the soldering iron core, made of copper alloy material with good thermal conductivity and copper as the base. The length of the iron head can be adjusted (the shorter the iron head, the higher the temperature of the iron head), and there are chiselled, pointed cone, round surface shape, round, pointed cone and semi-circular groove shape and other different shapes to adapt to the needs of different welding surface.
2, endothermic soldering iron by connecting rod, handle, spring clip, iron core, iron head (also known as copper head) five parts. Soldering iron core installed in the soldering iron head inside (heat fast, thermal efficiency up to 85% ~ %% above). Soldering iron core using nickel-chromium resistance wire wound in the porcelain tube made of general 20W soldering iron resistance of 2.4kΩ or so, 35W soldering iron resistance of 1.6kΩ or so. Commonly used endothermic soldering iron operating temperature is listed in the following table soldering iron power / W20254575100 end temperature / ℃ 350400420440455 Generally speaking, the greater the power of the soldering iron, the greater the heat, the higher the temperature of the iron head. Welding integrated circuits, printed circuit boards, CMOS circuits generally choose 20W endothermic soldering iron. The use of soldering iron power is too large, easy to burn components (generally diode, transistor junction temperature of more than 200 ℃ will be burned) and make the printed wires from the substrate off; the use of soldering iron power is too small, the solder can not be fully melted, the flux can not be evaporated out of the weld, the weld point is not smooth, not solid, easy to produce a false soldering. Welding time is too long, will also burn the device, generally each soldering point in 1.5 ~ 4S to complete.
3,Other soldering iron
(1) thermostatic soldering iron thermostatic soldering iron iron head, equipped with a magnet-type temperature controller to control the power-on time, to achieve the purpose of constant temperature. In the welding temperature should not be too high, the welding time should not be too long components, should be used thermostatic iron, but it is expensive.
(2) suction tin soldering iron suction tin soldering iron is a piston type tin sucker and soldering iron dissolved in one of the desoldering tools, it has easy to use, flexible, wide range of application and so on. The disadvantage is that each time only one soldering point for desoldering.
(3) steam soldering iron with liquefied petroleum gas, methane and other combustible gases combustion heating iron head soldering iron. Applicable to the inconvenience of power supply or can not supply the occasion of AC power.
