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       Plasma surfacing refers to the use of plasma arc as a heat source, and the high temperature generated by the plasma arc is used to rapidly heat the alloy powder and the surface of the substrate, and then melt, mix, diffuse and solidify together. layer, so as to realize the surfacing process of strengthening and hardening of the surface of the part. Plasma surfacing is one of the metal surface treatment methods, which has advantages that other surface treatment methods do not have.



1. The surfacing layer and the butt weld used in the plasma surfacing welding in surface treatment are synergistic in the metallurgical industry, with high compressive strength and good impact resistance.



2. It is beneficial to adjust the composition and characteristics of the surfacing metal material.



3. The surfacing layer is thick and thin. Under normal circumstances, the thickness of the surfacing layer can be adjusted within the range of 2 to 30mm, which is more suitable for not optimistic damage.



4. Cost-saving and reasonable. When the conventional material of the product workpiece is a general material and the appearance is covered with high aluminum alloy, it not only reduces the manufacturing cost, but also saves a lot of precious metals. In the process of product workpiece maintenance, effectively selecting surfacing aluminum alloys and carrying out surfacing repairs on damaged product workpieces can greatly prolong the service life of product workpieces, delay the maintenance cycle time, and reduce production costs.



5. Because the surfacing process is based on electric welding to improve or repair the specifications of the parts, or to obtain an aluminum alloy layer with extraordinary characteristics on the appearance of the parts, it is not difficult for the staff who are skilled in the welding method and have strong operability.



6. The cladding speed of surfacing welding is fast and the dilution rate is low; the surfacing layer is tightly organized and beautiful in shape.



7. Plasma surfacing welding can be carried out directly under the surface of rusted and oily metal parts without complicated pretreatment process.



As one of the surface treatment methods, plasma surfacing can be widely used in petroleum, chemical, construction machinery, mining machinery and other industries, such as the sealing surface of various valves, conventional gate valves, globe valves, check valves, safety valves, etc. Wear-resistant surfacing welding, and repair after wear of oil drill pipes, bearings, shafts, rolls, and picks, etc. The application prospect is very broad.

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