Galvanizing a welded metal construction using the hot method requires a clean welding area, since this parameter affects the appearance and quality of the final result.
When using a coated electrode for welding, all slag obtained during the production process must be removed before galvanizing, otherwise the coating will not reliably adhere to the surface at the welding sites, which will lead to the appearance of bare spots on the coating.
The use of chemical detergents, which are used in the process of galvanizing, is not capable of removing slag from welding, and therefore it is necessary to apply grinding using abrasive jet or fire cleaning, brushes with wire bristles.
Slag formed during welding melts under the influence of welding wire and remains on the weld seams. The seams that perform the bare wire, do not lead to the appearance of slag, and therefore do not require grinding.
Galvanizing a welded metal structure using the hot-dip method requires a clean weld area because this parameter affects the appearance and quality of the final result.
When using a coated electrode for welding, all slag produced during the work process must be removed prior to galvanizing, otherwise the coating will not be securely attached to the surface at the welding sites, resulting in bare spots on the coating.
Use of chemical detergents, which are used in the galvanizing process, are not able to remove the slag from welding, and therefore it is required to apply grinding using abrasive jet or fire cleaning, wire brush.
Slag produced during welding melts under the influence of the welding wire and remains on the welding seams. Seams that perform bare wire, do not lead to the appearance of slag, and therefore do not require grinding.
Removing white plaque requires drying the surface. Until the complete removal of the plaque on the galvanized surface, the air flow is limited, and therefore corrosion will continue, which will inevitably lead to damage to the zinc coating and the product itself.
As soon as the surface is dry, you can proceed with further actions, which depend on the degree of white plaque. With light RAID requires air flow. If it is not available, then the plaque is removed with a brush with a bristle of nylon. The plaque of medium and heavy degree is necessarily removed, since the zinc plaque is formed, which affects the reduction of the duration of operation of the coating and the product itself.
After removing the plaque with a brush and suitable detergent, the coating must be measured to ensure that it meets the required parameters for optimum protection of the steel. If the plaque has a medium or severe black color, the product must be subjected to re-galvanization.
Hot or General galvanization is used to produce a protective coating on steel and iron products by placing them in a container with liquid zinc. Before coating, each product must be cleaned of oil and other dirt.
Cleaning includes degreasing with acid etching to remove rust askalany and to prevent oxidation prior to placement in zinc. There are two types of galvanizing: dry and wet. The process is carried out in a dry way with the preliminary dissolution of ammonium chloride in zinc. The wet method is to use the molten flow in the tank.
Hot dip Galvanizing is used on materials of different sizes from bolts to overall products of different structures. The size of zinc containers and the processing process can be limited by the size of the steel. Large capacity for the production of hot dip galvanizing has a size of 13 m in length and 3 m in depth. However, the size of the container can be significantly increased by immersing the product for coating in parts.
Products are mainly galvanised, including asymmetrical shapes and structures with areas of uneven thickness. Since the steel undergoes temperature changes during the process, the products of asymmetric shape or with areas of different thickness are expanded and compressed, which leads to deformation.
Fastenings, which are used after the galvanization process, allow to maintain the stability of the form as a result of expansion or compression. If the steel fasteners are not used, the resulting defects may partially disappear.
Galvanized coatings are highly resistant to mechanical stress, but coating deformation may occur during processing, installation and operation. Some product areas may not have coverage due to untreated areas. That is why the methods are used for guaranteed undamaged coating after galvanizing. Three repair methods can be used to repair damaged and missed coverage areas:
Painting Process and the repair method must be selected individually. Regardless of the method chosen, corrosion protection is always the leading factor to determine it. A common mistake is the confusion between cold galvanizing and the use of zinc paints. It is worth noting that not one of the above methods does not provide the same protection against corrosion as hot-dip galvanized coating.
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