The reason why the soldering iron does not hang tin
1, the power of the soldering iron is too large
The power of the soldering iron head from 20W, 25W, up to several hundred watts. External heat type soldering iron manufacturing process is complex, low efficiency, high price, quick-heat type due to the large transformer to hold in the hand, the operation is difficult; internal heat type soldering iron structure is simple, high thermal efficiency, lightweight and flexible, when the first choice. Used to decorate the transistor, IC type of radio, television, for general circuit experiments, generally 20W is appropriate, repair vacuum tube machine, such as gallows, old instruments, 35W is appropriate, the external heat type is 45W, welding transformer wiring, metal base plate on the grounding trunk, it is the use of endothermic 50W, external heat type 75W. you can compare the head of the soldering iron you are using is not the power is too big. You can compare the soldering iron head you use is not too much power.
2, poor quality of the iron head
There are some poor quality soldering iron head on the market, if you accidentally buy it, it is easy to appear the soldering iron head hanging tin problem.
Solution:
First prepare a blade and new soldering wire, to contain flux. First of all, the soldering iron burn hot, and then pull out, with a razor blade to the location of the tin scraped clean, with a new solder wire to fill the tin, at first may not be up, not up and then scraped clean, re-on, when the low to a suitable temperature, the soldering tin naturally go up, if not, repeat the process, if not, that is, your soldering iron head containing too much tin, on the tin, take the magnet to try to know. Know.
3, the soldering iron long time dry burning
Soldering iron power for a long time without using, the use of low-quality solder and rosin, or long put before not hanging tin to protect the soldering head, caused by the soldering iron soldering head hanging tin layer off, resulting in the soldering head does not hang tin.
Solution:
(1) remove the power supply, in the state of the soldering iron cooling, the soldering head removed (note: to light demolition, do not break the heating rod), in the preparation of the 1000 mesh sandpaper on the ground off the black layer of tin does not hang, of course, if the sandpaper is not good enough to buy it, the fine grit surface of the household whetstone can be polished.
(2) will grind out the copper-coloured soldering head, mounted on the soldering iron, plugged into the power supply.
(3) in the soldering iron head gradually warmed up (note that at this time, do not dip the tip of the rosin and absorbent sponge), touch the tip with rosin core solder wire. From the beginning of the non-melting, to the soldering head temperature gradually increased, the solder wire gradually began to melt. At this point, the solder wire will touch all the copper-coloured surface of the soldering head, the solder can be hung.
(4) will hang a good soldering head, in the rosin dipped, can be used.
