A welding machine is an essential tool in metal fabrication, used to join metals by melting their surfaces together. It operates through various methods, such as MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), and Stick welding. The machine supplies a consistent electrical current to the welding electrode or filler material, which, when heated, creates a molten pool that bonds the metals upon cooling. Features often include adjustable voltage and amperage settings for precision, cooling systems to prevent overheating, and safety mechanisms like automatic shutoff and protective shields. Welding machines are crucial in industries ranging from automotive to construction, offering versatility in joining different metal types and thicknesses with high strength and durability.