75results about How to "Avoid blanking" patented technology

The invention discloses a surfacing welding method for enclosed connection of a long-distance pipeline without mending. The technical scheme is characterized in that the long-distance pipeline is connected with a short joint, and the connection end opening between a prefabricated pipe A and a prefabricated pipe B in an enclosed manner; the connection end opening is subjected to surfacing operation by corrosion resistant alloy; a ladder-shaped corrosion resistant alloy surfacing method is adopted; a three-phase 'dead opening' butt joint method is adopted; a double-barrel four-electrode TIG is utilized for surfacing welding with corrosion resistant alloy; corrosion resistant alloy flux-cored wires MIG are utilized for backing weld; corrosion resistant alloy solid welding wires MAG are utilized for transition welding; with the composite welding method, ordinary carbon steel welding wires MAG are utilized for filling and capping in order to form the surfacing welding method for enclosed connection of the long-distance pipeline without mending.The technical scheme of the surfacing welding method for enclosed connection of the long-distance pipeline without mending has following beneficial effects: anti-corrosion continuity of the inner wall of the pipeline is ensured after the long-distance pipeline touches the dead opening; the conventional process of anticorrosive treatment for the inner wall of a welding seam is avoided when a widow is opened after the dead opening is touched; the window is not welded in an enclosed manner; no gap exists in an anti-corrosion layer of the inner wall of the window; and corrosion resistant performance and service life of the long-distance pipeline are improved.