The difference between spray welding

       

The bonding of the sprayed layer and the sprayed-welded layer with the base metal is different. When the nickel-clad aluminum is heated by the spraying flame beam, an exothermic chemical reaction occurs, and a micro-metallurgical bond is formed on the surface of the carbon steel with RZ>50μm and Sa3 level after sandblasting and rust removal. The bottom layer and the working layer produce a mechanical bonding coating with "anchor hook" effect, while the bonding between the spray welding layer and the substrate is purely a metallurgical bonding coating.

The densities of the coatings are different, the sprayed layer is dense, while the sprayed layer has a few pores. The ability to bear the load is different, the spray coating can generally withstand large-area contact, and it is mostly used on the working surface with lubricated conditions, the mating surface and other working conditions with less stress, but the spray coating can withstand greater impact force. , extrusion stress or contact stress, etc.



Different spraying materials, spray welding requires the use of self-fluxing alloy powder, 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 spray welding and It can be used for spraying, but the spraying powder does not have self-fluxing and can only be used for spraying and not for spray welding. The heating conditions of the workpiece are different. In the process of spraying and spray welding, the preheating temperature before spraying is different, the workpiece is affected by heat differently, and the structure and performance of the workpiece after spraying are also different.