How to fix a bar soldering iron that doesn't heat up when it's powered on.
Soldering iron does not heat up after energised there are two cases, one is not heat up at all after energised, this may be the core of the soldering iron or the power cord is damaged, at this time the digital multimeter resistance file can be used to measure the soldering iron power cord resistance between the plugs, the general normal soldering iron the resistance of one hundred and ten ohms to one or two thousand ohms (the greater the power of the soldering iron, the lower the resistance measured), if the resistance measured as infinity, it may be the core of the iron or the power cord is damaged, as long as the replacement of the core or the power cord can be. Power line is damaged, as long as the replacement of the iron core or power line can be.
Oxidised soldering iron tip.
If the soldering iron is powered on for a long time or slightly hot, can not melt the solder wire, this may be the soldering iron head attached to the inner wall of a thick layer of oxides, preventing the iron core of the heat transfer to the iron head. Some cheap soldering iron does not come with thermostat and thermostat function, and the use of the above picture shows the copper iron head, so a long time power heating, copper iron head in the high temperature is easy to oxidation and produce a kind of thermal resistance to a larger oxide attached to the iron head of the inner wall, resulting in the iron core of the heat generated by the iron can not be properly transferred to the iron head, so that can not melt the solder wire.
Adjustable temperature soldering iron.
If the oxidation of the soldering iron head is serious, resulting in the inability to weld properly, it is recommended to replace a better temperature-adjustable soldering iron, after all, the good and bad soldering iron on the welding quality has a great impact. Like the above picture shows the price of this temperature-adjustable soldering iron but more than 20 yuan, built-in temperature-adjusting circuit, and the head of the iron is an alloy, at high temperatures is not easy to oxidise black, it is very convenient to use.
Soldering iron is made of iron head, iron core, metal shell, wood (plastic) handle, terminal and power cord and other parts of the composition. The heat source of the soldering iron is mounted on the head of the iron core, as long as the iron core is electrified, you can work normally.
The soldering iron is not hot first of all should take the multimeter to measure the power inserted into the head of the two feet, under normal circumstances, the resistance value should be in the hundreds to thousands of ohms between. If it is open-circuit state, you need to open the handle to check whether the wiring is firm and reliable. Then measure the terminals.
The connection between the terminal and the lead of the iron core is a relatively easy place to get into trouble, sometimes it seems to be well connected to the actual has been disconnected, need to be carefully checked. If the iron core is damaged, buy a new one and replace it.
