What is the reason an electric soldering iron does not heat up after a period of inactivity?
1. It's not hot at all
If it's not hot at all, use the resistance range of a multimeter to measure the resistance of the power cord plug, and it must be ∞. Disassemble the soldering iron, remove or peel off the insulation 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 indicates that the core of the soldering iron is good, and it is a problem with the power cord - it is pulled off or the contact inside the plug is poor. If the resistance value is still ∞, it indicates that the soldering iron core is broken. The following are two common types of electric soldering iron cores: externally heated and internally heated.
Reasons for damage to chromium iron core:
Caused by falls and impacts. Due to the fact that the heating wires of the chromium iron core are wrapped around quartz or ceramic tubes, these insulating media are inherently brittle. Once heated, they become even more brittle and cannot withstand impacts or falls. Otherwise, they will break and cause damage.
The quality of the soldering iron itself is poor, and the heating wire has been burned off. On the market now, electric soldering irons priced at 3-5 yuan each have almost no difference in appearance from those priced at tens of yuan each. They can be fake and fake, but the quality is poor and not durable. People often say "you get what you pay for", and that's true.
2. It can heat up, 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 may seem that the heat is not enough, but in reality, the soldering iron tip has been burned to death.
If this situation occurs, you can repeatedly dip the still heating electric soldering iron in rosin and rub it against the tin block until the soldering iron tip is coated with tin, and the color changes from black to bright. For long-life electric soldering irons with pointed tips, it is strictly prohibited to use a file to file them, as the alloy tip will be filed off.
The soldering iron head and core are both consumable materials, and damage is a normal phenomenon. However, mastering the correct usage method of electric soldering iron can prolong its service life.
