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Joe/Andy, <br /> <br />I like to use a small amount of flux even when usin rosin-core solder. It seems to help the solder flow a bit better, especially at lower wattage settings. <br /> <br />When soldering, you can tell by the brightness of the solder if you have a good joint. If the solder is bright and shiny when finished you can be sure you have a good joint. If very dull you didn't get the solder hot enough and it may work loose. I realize there may be times when lower heat is a must, but to be sure to get a good joint use the higher wattage when possible.
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