Depends on the solder type mainly, but the typical difference is about 50-60*C:
http://www.empf.org/empfasis/jan05/lfaudit.htm
Also if someone uses uncontrollable soldering-iron, the only way to lower melting temperature is to add Pb-containing solderHand soldering processes
Even for hand soldering, the processing differences between tin lead and lead free must be considered. The solder tip must be adjusted to the higher temperatures required. For lead free solders, the EMPF found that the solder tip temperature needed to be set between 343°C / 650°F and 371°C / 700°F as opposed to 315°C / 599°F for tin lead solders. Temperatures higher than 398°C / 750°F were considered unnecessary for most hand soldering applications..




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