Service Ghor on Instagram: "The video shows a soldering iron being used to create an electrical connection on a printed circuit board (PCB). A soldering iron is a hand tool that uses heat to melt solder, a metal alloy, which then flows between two pieces of work, such as an electronic component lead and a copper pad on the circuit board. Key details: Purpose: Soldering irons are widely used in electronics assembly and repair to form permanent, conductive bonds called soldered joints. Mechanism: