In general, the melting point of a solder is lower than other metals and metal alloys you see or use regularly. This means a 40 watt iron is enough to melt a solder. However, if the solder material is lead-free or contains a low percentage of lead or thicker than usual solders, then the soldering iron needs to be more than 40 watts capacity.
Follow the following tips to make your soldering iron melt any types of solders fast:
Use a soldering iron that can fetch high voltage, anything higher than 40 watts.
Keep the iron tip clean always, after each work-day brush it thoroughly, rubbing it with a paper also works.
Ensure that the power cord is properly plugged.
Start using it on a solder only when it is sufficiently heated, otherwise, the solder will not melt fast or evenly.
Last but not the least, hold the soldering iron in the proper position, users often mistake in this matter.
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Get a lower melting point solder
get a higher temp tip if so equiped
get a higher wattage iron.
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