What causes the electric soldering iron to not heat up after some time of inactivity?
1. Not hot at all
If it is not hot at all, use the electric resistance of the multimeter to measure the resistance of the power cord plug, it must be ∞. Disassemble the electric soldering iron, remove or peel off the insulating sleeve at the connection between the power cord and the soldering iron core, measure the resistance of these two points, if there is resistance, it means that the core of the electric soldering iron is good, and it is the problem of the power cord— ——It was pulled off or there was a bad contact in the plug. If the resistance value is still ∞, it means that the soldering iron core is broken. The following are two common soldering iron cores: external heating type and internal heating type.
Reasons for the damage of the chromium iron core: ●Because of falling and knocking. Since the heating wire of the chromium-iron core is wound on the quartz or in the ceramic tube, these insulating media are inherently brittle, and become more brittle once heated, and cannot withstand knocking or falling, otherwise, they will break and cause damage. ●The quality of the soldering iron itself is poor, and the heating wire is blown. Now on the market, electric soldering irons that cost 3 to 5 yuan a piece have basically the same appearance as those that cost tens of yuan a piece. They can be faked, but the quality is poor and not durable. People often say "you get what you pay for," and it's true.
2. It can be heated, but the heat is not enough to melt tin
The characteristic of this phenomenon is that the soldering iron has black hair and cannot melt the solder. It seems that the heat is not enough, but in fact the tip of the soldering iron is "burned to death".
If this happens, dip the soldering iron that is still heating with rosin repeatedly and rub it on the tin block until the tip of the soldering iron is tinned, that is, the color changes from black to bright. For the long-life electric soldering iron with a pointed tip, it is strictly forbidden to use a file to file, because the alloy head will be filed off.
The tip and core of the soldering iron are consumable materials, and damage is a normal phenomenon, but mastering the correct use of the soldering iron can prolong its service life.
