Thermal joining is a process used to connect materials, typically metals, by applying heat. This method involves melting the edges of the materials to be joined, allowing them to fuse together as they cool. Common techniques include welding, soldering, and brazing, each varying in temperature and application. The heat source can come from various methods, such as electric arcs, flame, or laser beams. Thermal joining is widely used in industries like construction, automotive, and manufacturing, providing strong and durable connections essential for structural integrity and functionality.