Soldering Solid Rod is a metal rod made of a specific alloy that melts at a low temperature. These rods are used in the process of soldering, which is a technique used to join two or more metal pieces together. Soldering Solid Rod is a process that involves melting the soldering rod with a soldering iron or torch and then applying it to the joint that needs to be bonded. It solidifies and creates a strong bond between the two metal pieces.