What is the difference between spraying and spraying?

       1) The heating conditions of the workpiece are different

There is no remelting process in spraying, and the surface temperature of the workpiece can always be controlled below 250 degrees Celsius, generally without deformation and changes in the original structure of the workpiece. This is beneficial for spray repairing workpieces with complex shapes, thin walls, long axes and some important parts. The powder layer should be melted by spray melting, and the temperature of remelting and sintering workpieces can reach more than 900 degrees Celsius, which is easy to cause stress and deformation, and most workpieces will undergo annealing and incomplete annealing.

2) The bonding state with the substrate surface is different

The combination of spraying and the surface of the substrate is mainly mechanical occlusion, and there are also microscopic welding, and the bonding strength is not high; generally 20Mpa~65MPa spray welding is to form a metallurgical bond with the surface of the substrate through the melting of the powder layer, and the bonding strength is average Up to 343Mpa~441Mpa

3) The powder used is not different

The powder used for spray melting must be self-fluxing alloy powder, and the powder used for spraying is not limited.

4) The spray layer structure is different

The spray melt layer is uniform and dense, and it is generally considered that there are no pores while the spray layer has certain pores.

5) Different load bearing performance

The spray coating cannot withstand impact load and high contact stress, and is suitable for various surface contact fits. The melt-blown layer has high bonding strength, can withstand impact loads, can be used in line contact and other occasions, and can withstand high contact stress.