Arc welding machines are tools used to join metal parts together by creating an electric arc between an electrode and the workpiece. This intense heat melts the metal, allowing it to fuse as it cools. These machines are commonly used in construction, manufacturing, and repair work due to their efficiency and versatility. There are various types of arc welding machines, including MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), and Stick welding. Each type has its own specific applications and advantages, making them suitable for different materials and project requirements. Proper safety measures are essential when using these machines to prevent accidents.