[ Problem Point ]
We have no idea about how to lead-free soldering of printed circuit boards.
[ ⇒Kaizen Point ]
The spot was heated by the small type of the Halogen Point Heater.
Elevating the temperature time is short, it worked so easy soldering temperature control.
Since the heating spot, with minimal thermal stress to other parts.
Moreover, since non-contact, no physical damage even solder dregs.