Product Details
The overall build-up welding repair technology for tube molds is a patented technology developed by our company, which enables a large number of tube molds damaged due to fatigue and scrapped due to wear to be repaired and regenerated for reuse. The invention of the spiral swing build-up welding process method and equipment for the inner and outer walls of long cylinders is a build-up welding process method and corresponding specialized equipment and build-up welding alloy materials that can improve the thermal fatigue resistance of the steel cylinder inner wall su***ce.
The overall build-up welding of the inner wall of steel long cylinders with a diameter of not less than 500mm at high temperatures has always been an insurmountable challenge due to the limitations imposed by the size of the inner hole of the long cylinder, the depth of the welding head of the pipe mold build-up welding equipment, the delivery and recovery of welding wire and flux, as well as the heat resistance limits of cables, motors, and electrical components. Traditional spiral step-by-step single-pass build-up welding perpendicular to the axis is prone to generating circular thermal fatigue cracks along the weld bead under high-temperature and rapid heating and cooling conditions, which reduces the fatigue resistance of the cylinder and leads to premature failure. Traditional build-up welding repairs for cylinders often use welding materials with compositions close to the base material of the cylinder, resulting in a service life far lower than that of the base material, ****** the repair of little value.
The aforementioned challenges have constrained the overall build-up welding manufacturing and repair of long cylindrical components, limiting the application technology. This invention successfully and effectively addresses these challenges, enabling build-up welding of the inner wall of long cylinders at high temperatures and improving the thermal fatigue resistance, corrosion resistance, and wear resistance of the inner wall su***ce. This makes it possible to perform pre-protection strengthening treatment and repair on the working su***ce of the inner wall of long cylindrical components. The economic benefits are significant. It can be widely applied to the repair of ductile iron pipe molds, roller-type ball mills, ***, corrosion and wear resistance pre-protection build-up welding and repair of the inner wall of chemical reactors, as well as the repair of the inner wall of large hydraulic cylinders. The final hardness and performance of the build-up welding working su***ce can be adjusted by the heat treatment temperature (HRc35-44). Repairing pipe molds or the inner or outer circumference of long cylindrical tubes using this process can fully meet the technical requirements of users. The dedicated pipe mold build-up welding machine can continuously build-up weld for 7 meters without turning around, and can build-up weld for 13 meters with turning around. The retractable water-cooled welding head and 7-meter working cantilever can achieve spiral stepping and spiral winding, as well as automatic welding with axial linear oscillation, fully meeting various process requirements for long cylindrical build-up welding and achieving the special requirements of high-temperature continuous automatic welding.