![]() If you use more heat than necessary, the joint will stay liquid longer. It takes very little time to sufficiently heat the pipe for soldering, far more time for the pipe to cool down with ambient room temperature. It is important to remember with extended (pasty) workable ranges, more time is required for the solder alloy to set up and cool down. Once the connection temperature goes beyond 640 degrees F, the alloy will loose the ability to flow into the fitting cup. Simply put, the alloy will melt around 440 degrees F and achieve capillary action at temperatures close to 640 degrees F. Silver-bearing solders typically have a 200 degree F workable range. The larger the tube, the more heat becomes an issue in the performance of the alloy. Silver added to the alloy will exhibit an extended pasty (working) range, ideal for sweat connections on large diameter copper. Silver-bearing alloys are plentiful and available from nearly every manufacturer. ![]() The alloy composition achieves quick flow and set up, a perfect combination for the majority of tube sizes joined today. When you add the lower heat tolerances of current ASTM B813 water-soluble fluxes to the equation, a lower temperature joining can have significant advantages. ![]() Premium alloys with a high selenium content lower the melting temperature to 410ΓΈ F, very close the melting temperature of traditional leaded solders. Premium solders boast a number of advantages over the generic lead-free alloys. The high performing lead-free alloys will contain a mixture of Tin (Sn), Copper (Cu) and either Silver (Ag) or Selenium (Se). When the code changed from leaded to lead-free solder for potable water, the ASTM B32 specifications were changed to Sb5 throughout the industry.
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