For this purpose, special soldering stations exist and are being sold. The cost of which is over the top for the average person and he (having a sound mind) will never buy it. Those who still want to get acquainted with this and somehow solve this problem, I recommend making a simple voltage regulator (manual, not automatic). If the soldering station has a soldering iron operating mode that maintains the set temperature, then I have a visual change in the supply voltage of the soldering iron. The device is greatly simplified, but the result is generally positive. To do this, you can make or take a ready-made voltage regulator for the power of soldering irons, which does not exceed, as a rule, 100 watts. This (regulators) you and the Chinese offer (ready-made), they are placed in all adjustable fixtures. You can make it yourself, a very simple scheme.
To visually determine the regulated voltage, you can also buy from the Chinese electronic indicators for alternating current (it costs all a little money), but you can (like mine) adapt any small-sized indicator.
Having picked up a suitable “case”, I got such an assistant. Now I have no such problem.
In the last photo, the indicator shows a voltage of 215 volts. You can adjust the voltage from 0 to maximum, in the network.
Here are some sketches for repetition.
