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.