06
2025
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01
What is spray welding and what are its significant advantages compared with
Author:
Spray welding is to reheat the preheated self-soluble alloy powder coating to 1000-1300℃, so that the particles are melted and the slag floats to the surface of the coating. The generated boride and silicide are dispersed in the coating, so that the particles and the substrate surface are well bonded.
Spray welding is to reheat the preheated self-soluble alloy powder coating to 1000-1300℃, so that the particles are melted and the slag floats to the surface of the coating. The generated boride and silicide are dispersed in the coating, so that the particles and the substrate surface are well bonded.
*The final deposit is a dense metal crystal structure and forms a metallurgical bonding layer of about 0.05-0.1mm with the matrix. Its bonding strength is about 400MPa. It has good impact resistance, wear resistance, corrosion resistance, and a mirror appearance.
Compared with the spray coating, the spray welding layer has significant advantages. However, due to the local heating of the base body during the remelting process, the temperature reaches 900°C, which will cause large thermal deformation of the parts.
Therefore, the application scope of spray welding has certain limitations. The parts and materials suitable for spray welding are generally:
① Parts that are subject to impact loads and require high surface hardness and good wear resistance, such as sandblasting machine blades, crusher tooth plates, excavator bucket teeth, etc.;
② Large and vulnerable parts with relatively simple geometric shapes, such as shafts, plungers, sliders, hydraulic cylinders, chute plates, etc.;
③ Low carbon steel, medium carbon steel (carbon content less than 0.4%), structural steel containing a total amount of manganese, molybdenum and vanadium less than 3%, nickel-chromium stainless steel, cast iron and other materials.
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