... used in electronics, plumbing, and assembly of sheet metal parts. Manual soldering uses a soldering iron or soldering gun. Alloys that melt ... soldering', 'silver soldering', or brazing.Lead-free solders in commercial use may contain tin, copper, silver, bismuth, indium, zinc, antimony, and ... best choice for your application, but to be safe, always use a flux core so that you don’t forget. 10PCS/box ...