It has many advantages, such as small size, light weight, easy to carry, good welding quality, and has less demanding on the environment and the use of space. It is widely used in large-scale equipment, pin hole construction machinery, such as the hole in the bearing bore welding repair, a short distance of the longitudinal seam weld. In short, the portable automatic bore welding is an essential tool for the mining industry and the maintenance of the project site.