... , the lower the melting point. The most common lead-free solder contains 95 percent tin and ... the solder.UsageRosin-core solder is the most common type of solder and is a multi-purpose ... soldering electronics, which is one of the most common uses for this joining process, rosin-core solder is the ... soldering electronics, which is one of the most common uses for this joining process, rosin-core solder is ...