An arc welder is a tool used in welding that creates a strong bond between metal pieces by using an electric arc. This arc is generated between an electrode and the workpiece, producing intense heat that melts the metal surfaces, allowing them to fuse together. Arc welding is commonly used in construction, manufacturing, and repair work due to its efficiency and versatility. There are several types of arc welding processes, including MIG welding, TIG welding, and stick welding. Each method has its own specific applications and advantages, making arc welding suitable for various materials and thicknesses. Safety precautions, such as wearing protective gear, are essential when using an arc welder to prevent injuries from sparks and UV radiation.