... and calculator and so on.Solder sometimes in is metal alloy used to join together metal workpieces and having a melting ... 'hard soldering', 'silver soldering', or brazing.Lead-free solders in commercial use may contain tin, copper, silver, bismuth, indium, zinc, antimony, and ... , crowded connections. Next choose the alloy. Leaded solder ranges from 40 percent tin and 60 percent lead (40/60) to 50/50 ...