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CN-121972860-A - Copper-based wear-resistant metal powder core welding wire and surface strengthening method for desulfurization mortar pump flow-through part

CN121972860ACN 121972860 ACN121972860 ACN 121972860ACN-121972860-A

Abstract

The invention relates to the technical field of metal material surface modification, in particular to a copper-based wear-resistant metal powder core welding wire and an outer metal powder core welding wire, which are used for preparing an inner metal powder core welding wire and an outer metal powder core welding wire, cleaning the surface of a desulfurization mortar pump flow-through part and performing preheating treatment, preparing an inner cladding layer on the surface of the preheated desulfurization mortar pump flow-through part by using the inner metal powder core welding wire, preparing an outer cladding layer on the surface of the inner cladding layer by using the outer metal powder core welding wire, and performing blank-feeding cladding heating without welding wire for the outer cladding layer along a welding bead, and applying ultrasonic treatment during the period. According to the invention, the inner cladding layer and the outer cladding layer are sequentially covered on the surface of the substrate, so that the cladding layer has good hardness, wear resistance and impact toughness, and the overall quality of the substrate is improved.

Inventors

  • ZHANG XIANGJUN
  • Zu Pingwen
  • XU SHUAI
  • YANG WENTAO
  • NIE HAIJUN
  • WANG LONG
  • WANG YUJIAN
  • CHEN WENQI

Assignees

  • 华电电力科学研究院有限公司

Dates

Publication Date
20260505
Application Date
20260116

Claims (10)

  1. 1. The copper-based wear-resistant metal powder-cored welding wire is characterized by comprising an inner-layer metal powder-cored welding wire and an outer-layer metal powder-cored welding wire, wherein the inner-layer metal powder-cored welding wire consists of an inner-layer metal powder core and a welding wire outer skin, and the outer-layer metal powder-cored welding wire consists of an outer-layer metal powder core and a welding wire outer skin; The inner layer metal powder core comprises, by mass, 15-25% of Ni powder, 8-10% of Ti powder and the balance of Cu powder; The outer layer metal powder core comprises, by mass, 15-25% of Ni powder, 1-2.5% of Si powder, 10-12% of Cr powder, 8-10% of Ti powder, 1-2% of Nb powder, 10-20% of TiC powder and the balance of Cu powder.
  2. 2. The copper-based wear-resistant metal powder cored wire of claim 1 wherein the wire outer skin is comprised of pure copper tape.
  3. 3. The copper-based wear-resistant metal powder-cored wire of claim 1 wherein the inner metal powder-cored wire and the outer metal powder-cored wire are both controlled to have a fill ratio of 20wt.% to 25wt.% and a diameter of 1.2 mm to 1.5 mm.
  4. 4. A method for strengthening the surface of a desulfurization slurry pump flow-through part, which adopts the copper-based wear-resistant metal powder-cored welding wire as claimed in any one of claims 1 to 3, and is characterized by comprising the following steps: S1, weighing and uniformly mixing raw materials required by an inner metal powder core according to a proportion, and taking a pure copper belt as a welding wire outer skin to prepare an inner metal powder core welding wire; S2, preheating the surface of the desulfurization mortar pump flow-through component; S3, using an inner metal powder core welding wire, designing a single-layer multi-pass welding cladding process based on MIG welding, preparing an inner cladding layer on the surface of the preheated desulfurization mortar pump flow-through part, cooling to room temperature, and polishing and deslagging; s4, designing a cladding process of multilayer multi-pass welding based on MIG welding by using an outer metal powder core welding wire, preparing an outer cladding layer on the surface of the inner cladding layer, cooling to room temperature, and polishing and removing slag; S5, performing blank-feeding welding wire free cladding heating on the external cladding layer by adopting TIG welding along the welding path in the step S4, and applying ultrasonic treatment during the blank-feeding welding wire free cladding heating; s6, polishing and removing slag after cooling to room temperature.
  5. 5. The method for surface strengthening of a desulfurization slurry pump flow-through member according to claim 1, wherein in step S2, the temperature of the preheating treatment is 220 to 250 ℃.
  6. 6. The method for strengthening the surface of a flow-through part of a desulfurization slurry pump according to claim 1, wherein in the step S3, the thickness of the inner cladding layer is 0.5-0.8mm, the inner cladding layer comprises a plurality of parallel overlapped welding beads, each welding bead is 5mm wide, and the cladding overlap ratio of adjacent welding beads is 45-50%.
  7. 7. The method for strengthening the surface of a flow-through part of a desulfurization slurry pump according to claim 1, wherein in the step S4, the outer cladding layers have 2 layers, each layer has a thickness of 1-1.5mm, each outer cladding layer comprises a plurality of parallel overlapping welding beads, each welding bead has a width of 5mm, and the cladding overlap coverage of adjacent welding beads is 45-50%.
  8. 8. The method for strengthening the surface of the desulfurization slurry pump flow-through component according to claim 1, wherein in the steps S3-S4, parameters of MIG welding are that welding current is 110-140A, welding voltage is 16-18V, welding speed is 0.3m/min, pure Ar is used as protective gas, and flow is 12L/min.
  9. 9. The method for strengthening the surface of the flow-through part of the desulfurization slurry pump according to claim 1, wherein in the step S5, parameters of the TIG welding are that the welding current is 110-150A, the tungsten electrode extends out to be 3mm, the welding speed is 0.8m/min, the nozzle height is 6mm, pure Ar is used as protective gas, and the flow rate is 12L/min.
  10. 10. The method for surface strengthening of a desulfurization slurry pump flow-through member according to claim 1, wherein in step S5, the power of the ultrasonic treatment is 700 to 900W.

Description

Copper-based wear-resistant metal powder core welding wire and surface strengthening method for desulfurization mortar pump flow-through part Technical Field The invention relates to the technical field of metal material surface modification, in particular to a copper-based wear-resistant metal powder core welding wire and a surface strengthening method of a desulfurization mortar pump flow passage component. Background The flow-through components (impellers, pump shells, etc.) of the desulfurization slurry pump are used for long-term conveying of slurry containing hard particles and possibly corrosive, and are subjected to severe abrasion, cavitation and corrosion, so that the slurry becomes the key component which is most easy to fail in the whole pump. These components are usually manufactured precisely from expensive wear-resistant materials such as high-chromium cast iron, and are expensive and have long spare parts production cycles. The direct replacement of new components is costly and the production loss due to downtime is more considerable. The worn area is repaired in time, instead of being replaced integrally, the cost can be obviously reduced, the downtime is greatly shortened, and the production continuity is ensured. And meanwhile, the original component matrix is restored and utilized, so that the resource consumption and the waste are reduced, and the requirements of circular economy and sustainable development are met. Therefore, the efficient repair of the overcurrent component is a key maintenance strategy for guaranteeing equipment operation, reducing cost, enhancing efficiency and trampling environmental protection. The repairing method has the remarkable advantages that the deposited copper alloy layer has excellent wear resistance, cavitation resistance and weak acid/seawater corrosion resistance, and can effectively resist complex working conditions. The metal powder core welding wire process has high deposition efficiency, good forming and controllable dilution rate, and is particularly suitable for rapidly repairing a large-area abrasion area on site or in a workshop. The repair fully utilizes the component matrix, reduces the resource consumption and the abandonment, and is a key solution which takes into account the high-efficiency production, the obvious cost reduction and the sustainability. In the prior art, the metal powder core welding wire is adopted for repairing the workpiece, so that the cost can be greatly reduced, the downtime can be greatly shortened, and the production continuity can be ensured. The cladding layer formed by welding generally has good hardness and wear resistance, but is relatively brittle, and the cladding layer is prone to cracking or even falling off from the surface of the workpiece when subjected to severe or long-lasting impact. Based on the method, a copper-based wear-resistant metal powder core welding wire and a surface strengthening method of a desulfurization mortar pump flow passage component are provided. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a copper-based wear-resistant metal powder core welding wire and a surface strengthening method of a desulfurization mortar pump flow passage part, wherein an inner cladding layer and an outer cladding layer are sequentially covered on the surface of a substrate, so that the cladding layer has good hardness, wear resistance and impact toughness at the same time, and the overall quality of the copper-based wear-resistant metal powder core welding wire and the desulfurization mortar pump flow passage part is improved. In order to achieve the aim, the invention provides the technical scheme that the copper-based wear-resistant metal powder-cored welding wire comprises an inner metal powder-cored welding wire and an outer metal powder-cored welding wire, wherein the inner metal powder-cored welding wire consists of an inner metal powder core and a welding wire outer skin, and the outer metal powder-cored welding wire consists of an outer metal powder core and a welding wire outer skin; The inner layer metal powder core comprises, by mass, 15-25% of Ni powder, 8-10% of Ti powder and the balance of Cu powder; The outer layer metal powder core comprises, by mass, 15-25% of Ni powder, 1-2.5% of Si powder, 10-12% of Cr powder, 8-10% of Ti powder, 1-2% of Nb powder, 10-20% of TiC powder and the balance of Cu powder. Preferably, the welding wire sheath adopts pure copper strips. Preferably, the filling rate of the inner metal powder-core welding wire and the outer metal powder-core welding wire is controlled to be 20-25 wt%, and the diameters of the inner metal powder-core welding wire and the outer metal powder-core welding wire are controlled to be 1.2-1.5 mm. The invention also provides a surface strengthening method of the desulfurization mortar pump flow-through part, which comprises the following steps: S1, weighing and uniformly mixing raw materials requi