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2025
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01
The difference between spray welding
Author:
The bonding formation of the spray coating and the spray welding layer with the base metal is different. When the nickel-clad aluminum is heated by the spray flame beam, an exothermic chemical reaction occurs, and a micro-metallurgical bonding bottom layer and the working layer are formed on the surface of the carbon steel that has been sandblasted and rust-removed to Sa3 level and RZ>50μm, and a mechanical bonding coating with an "anchor hook" effect is produced. The bonding between the spray welding layer and the base is purely a metallurgical bonding coating.
The bonding formation of the spray coating and the spray welding layer with the base metal is different. When the nickel-clad aluminum is heated by the spray flame beam, an exothermic chemical reaction occurs, and a micro-metallurgical bonding bottom layer and the working layer are formed on the surface of the carbon steel that has been sandblasted and rust-removed to Sa3 level and RZ>50μm, and a mechanical bonding coating with an "anchor hook" effect is produced. The bonding between the spray welding layer and the base is purely a metallurgical bonding coating.
Spray
coating: The density of the coating is different. The spray welding layer is dense, while the spray coating has a small amount of pores. The ability to bear loads is different. The spray coating can generally withstand large-area contact and is mostly used on working surfaces with lubrication conditions, mating surfaces and other working conditions with less force. The spray welding layer can withstand greater impact force, extrusion stress or contact stress, etc.
Spraying materials are different. Spray welding requires the use of self-fluxing alloy powders, while spraying does not require high self-fluxing properties of the powder, and it is not necessarily a self-fluxing alloy powder. Various self-fluxing alloy powders can be used for both spray welding and spraying, but spraying powders do not have self-fluxing properties and can only be used for spraying but not for spray welding. The workpiece is heated differently. During spraying and spray welding, the preheating temperature before spraying is different, the workpiece is affected by heat differently, and the organization and performance of the workpiece after spraying are also different.
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