Metallizing equipment co offer zinc coating plants. Advantageous features that makes arc spray, the most user-friendliest and in terms of operating cost, the least expensive of the thermal or metal spraying processes based for applying metal coatings on base materials. Any electrically conductive material in wire form can be arc sprayed. A wire feeder pushes two electrically charged metallising wires to the gun. The wires meet at the head of the gun and melt in the electric arc. Molten mass is atomized and blown onto the substrate with compressed air. Particles cool to ambient temperature and coalesce into a high quality metal coating. A roll-forming machine draws hot or cold rolled steel through successive stations and shapes the material into a tube. Electric resistance welding closes the seam left by the butted edges. Although no filler metal is added that would change the chemical composition, the welding process applies temperatures high enough to sacrifice some corrosion resistant properties of the base metal. The process may also vaporize aluminium or galvanized coating previously applied to the rolled steel. A contoured/scrafing tool or smoothing mandrel removes weld spatter or excess material from the outer diameter of the tube surface. Many the makers install a two-wire electric arc spray process directly down line from the scraping tool or smoothing mandrel. The spray process applies coatings of aluminium, zinc or properties of the tubing. Applying the spray material while the weld seam is still hot assures a metallurgical bond of the sprayed material with the substrate, improves both the deposit efficiency and density of the sprayed material and allows the coating to blend, thereby helping to high the weld seam.
