Welding machines are tools used to join materials, typically metals, by applying heat and pressure. They work by melting the edges of the materials to be joined, allowing them to fuse together as they cool. There are various types of welding machines, including MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), and stick welding machines, each suited for different applications and materials. These machines are essential in many industries, such as construction, automotive, and manufacturing. They can be portable for fieldwork or stationary for factory use. Safety features, like protective gear and ventilation, are crucial when operating welding machines to prevent injuries and ensure a safe working environment.