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Tool time Tuesday and today we’re soldering. It is difficult to say who first discovered how to “glue” metals. One thing is certain; the goldsmiths of ancient Egypt knew how to join gold more than 5,000 years ago. Their colleagues in Troy were also masters of soldering. Unlike welding, soldering doesn’t melt the base metal. When you solder you heat the base metal and add another metal to complete the bond. Typical that metal is pure silver, or silver mixed with other, less expensive metals, like tin. Soldering can be done with an open flame, or a heated piece of hardened metal. These days you can use a propane torch for the open flame type, like used in plumbing or an electric soldering iron that is used to connect wires together or install components on a circuit board.