MIG welders, or Metal Inert Gas welders, are machines used for welding metals together. They work by feeding a continuous wire electrode through a welding gun, which melts the wire and fuses it to the base metal. This process is often favored for its speed and ease of use, making it suitable for both beginners and experienced welders. MIG welding uses an inert gas, typically argon or carbon dioxide, to protect the weld from contamination. This shielding gas helps create a clean and strong weld, reducing the risk of defects. MIG welders are commonly used in various industries, including automotive and construction.