How to fix a soldering iron that doesn't heat up after being powered on?
There are two situations where an electric soldering iron does not heat up after being powered on. One is that it does not heat up at all after being powered on, which may be due to damage to the soldering iron core or power cord. At this time, a digital multimeter can be used to measure the resistance between the plugs of the soldering iron power cord. Generally, the resistance of a normal soldering iron is between 100 to 2000 ohms (the higher the power of the soldering iron, the smaller the measured resistance). If the measured resistance is infinite, it may be due to damage to the soldering iron core or power cord. Simply replace the soldering iron core or power cord.
Oxidized soldering iron tip.
If the soldering iron remains slightly hot for a long time after being powered on and cannot melt the solder wire, it may be due to a thick oxide layer adhering to the inner wall of the soldering iron tip, which hinders the heat transfer from the soldering iron core to the soldering iron tip. Some cheap soldering irons do not have temperature control and constant temperature functions, and use the copper soldering iron tip shown in the picture. When heated for a long time with electricity, the copper soldering iron tip is easily oxidized at high temperatures, producing a high thermal resistance oxide that adheres to the inner wall of the soldering iron tip, causing the heat generated by the soldering iron core to be unable to be transmitted to the soldering iron tip properly, and thus unable to melt the solder wire.
Adjustable temperature soldering iron.
If the soldering iron tip is severely oxidized and unable to weld properly, it is recommended to replace it with a better temperature adjustable soldering iron, as the quality of the soldering iron has a significant impact on the welding quality. The adjustable temperature soldering iron shown in the above picture is priced at just over 20 yuan, with a built-in temperature control circuit and an alloy soldering iron tip that is not easily oxidized or blackened at high temperatures, making it very convenient to use.
An electric soldering iron is composed of several parts, including a soldering iron tip, soldering iron core, metal shell, wooden (plastic) handle, terminal post, and power cord. The heat source of the soldering iron is the soldering iron core installed on the head, which can work normally as long as the soldering iron core is powered on.
If the soldering iron is not hot, first use a multimeter to measure the two pins of the power plug. Under normal circumstances, the resistance should be between a few hundred to several thousand ohms. If it is in an open circuit state, you need to open the handle to check if the wiring is secure and reliable. Then measure the terminal post,
The connection between the terminal post and the soldering iron core lead is a prone area to problems. Sometimes, it may seem like the connection is good but has actually been disconnected, so careful inspection is necessary. If the soldering iron core is damaged, you can buy a new one and replace it.
