Welding machines are tools used to join materials, typically metals, by applying heat and pressure. They come in various types, including MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), and Stick welding. Each type has its specific applications and advantages, making them suitable for different projects, from industrial manufacturing to home repairs. These machines can be powered by electricity, gas, or even solar energy, depending on the model. Safety features, such as protective gear and ventilation systems, are essential when using welding machines to prevent injuries and ensure a safe working environment.