I wonder if you can unsolder copper pipes that are fixed I mean that I can not make them turn on if same, are elbows and my idea is to bring warmth i tap to remove the elbow. Then to return to welding, do I remove Tin that is left in the tubes? Since the piece of Tin that was welded fits. If so how is it does? At times running I want to do everything you can and take advantage of all the copper that is not cheap, elbows not take advantage them because I believe that more difficult to clean.
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