... solder bar 2.lead free solder bars 3.used manual soldering ,wave soldering optional 4.8%Zn 3 ... bar and Lead-free solder bar.1) It can applied in radio, communication, meters, instruments and copper ... electronics, plumbing, and assembly of sheet metal parts. Manual soldering uses a soldering iron or soldering gun. ... much lower melting points are available manual soldering 8%Zn3% Bi Lead-free solder bar