It is an old idea. It used to be called Resistive or Resistance
soldering. Alternator repair guy use a larger version to unsolder the
large diodes in the alternators . High current flows through the
solder heating it up. So the solder gets hot not the iron. It does
work great in some applications.
http://www.geocities.com/budb3/arts/meth/sldrrst.html --- In Homebrew_PCBs@yahoogroups.com, "gmanca101" <gmanca101@y...> wrote:
> I don't know if any other members have heard of this, but there is a
> new cordless soldering pencil that has been created. Its called the
> Cold Heat because it reaches 800 degrees F on contact with metal. It
> only runs on two AA batteries; it isnt recommended on sensitive
> components that the quick temperature increase may harm. And
> apparently, a few sites have recommended this tool for most jobs. Its
> at www.ColdHeatTools.com. Of course, this isnt a heavy duty deal,
> just a nice little gadget to go with the chest.