Application of Plasma Cladding Ni60A+35wc Wear-resistant Layer on Agricultural Machinery Knives(5)

       Four, conclusion
1) Plasma arc cladding Ni60A nickel-based self-fluxing alloy powder on the surface of low carbon steel can obtain a cladding layer that is metallurgically bonded to the substrate. The cladding layer has a dense structure, high strength and toughness, and good wear resistance.
2) During cladding, argon protects the workpiece so that there is no oxidation or burning of the workpiece during heating and cooling; the slagging and deoxidation effect of Ni60A alloy effectively avoids the generation of slag and oxides in the cladding layer
.
The combined effect of the above two makes the cladding layer have fewer defects and good wear resistance.
3) Under the test conditions, the process specifications for obtaining a Ni60A alloy layer with excellent argon arc cladding are: current 150 A, voltage 10 V, direct current connection, lap fusion, heat preservation and slow cooling.
4) Argon arc cladding Ni60A alloy has low cost and high quality cladding. It can be used for the wear-resistant strengthening treatment of the working surface of agricultural machinery tools, and can be used for the manufacture and remanufacturing of agricultural machinery tools.

5. Working principle and technical advantages of plasma arc cladding surfacing
Working principle: Plasma powder surfacing uses plasma arc as the heat source. The high temperature generated by the plasma arc is used to rapidly heat the alloy powder and the surface of the substrate and melt, mix, diffuse and solidify together. After the plasma beam leaves, it self-excitedly cools to form a layer of height.
High-performance alloy layer, so as to realize the strengthening and hardening of the surface of the parts, because the plasma arc has high arc temperature, high heat transfer rate, good stability, and strong controllability of penetration. By adjusting the relevant surfacing parameters,
The thickness, width and hardness of the surfacing layer can be freely adjusted within a certain range.
After plasma powder surfacing welding, a fusion interface is formed between the base material and the surfacing material, with high bonding strength; the surfacing layer has a dense structure, good corrosion resistance and wear resistance; the dilution of the base material and the surfacing material is reduced, and the material characteristics change little;
The use of powder as a surfacing material can improve the selectivity of alloy design, especially for smooth surfacing of refractory materials, and improve the wear resistance, high temperature resistance and corrosion resistance of the workpiece.