The 63/37 is what is called eutectic solder because it has a very sharp melting temp dip at the eutectic temperature of tin/lead alloy. It can be difficult to solder with because it has almost no pasty state going almost directly from liquid to solid. Its primary use is for rapid soldering processes that are usually automatic. It also has one other use, because it is the lowest melting temperature tin/lead alloy, it can be used in special applications called two stage soldering. It this process an initial soldering of a component is done usings, say 60/40 or maybe 50/50 which has a higher melting point, and can then have additional soldering done with the 63/37 without causing it all to come apart. Obviously this type process would require extreme control of soldering tools. Al, WA6VNN
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