Welding machine is a device that provides the electrical power to create heat, typically via an electric arc, to melt and fuse two metal pieces into a single, strong, and durable bond. Key components include the power source, an electrode (consumable or non-consumable), a ground clamp, and a welding gun or torch. Different types of machines exist for various welding processes, such as MIG welding for speed and versatility, TIG welding for precision, and stick welding for thicker metals.