I keep mine at about 650 for most repairs. For board repairs I lower it to 550. Keep in mind that lead free solder has a higher melting point (about 100 degrees higher) than leaded solder.
(Topic ID: 24776)
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Quoted from rancegt:It's not a good idea to mix lead-free and lead solder.
This is not completly true and there is hardly any evidence that mixing the two will create weak joints. The theoretical arguement behind this is that the joint is seen as weak because the lead free soldier hasn't fully melted to the point of the leaded solder causing microscopic indifferences in the mixed joint. Since everyone here has their heart set on a soldering temperature range of 600-750 this should not pose an issue, if it is an issue at all, since both types of solder should be fully melted. If you have any good references or documentation I would love to take a look at it.
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