Surfacing electrode for gear wear repair and preparation method thereof

Abstract

The invention relates to the technical field of surfacing electrodes, and provides a surfacing electrode for gear wear repair and a preparation method of the surfacing electrode. A surfacing welding rod for gear abrasion repair comprises a welding core and a welding skin wrapping the welding core, and the welding skin comprises 35-40 parts of marble, 10-20 parts of fluorite, 30-40 parts of high-carbon ferrochrome, 5-8 parts of magnesium nitride, 15-30 parts of titanium nitride, 1-3 parts of vanadium and 2-5 parts of zinc oxide; the welding core is composed of the following components of 0.05%-0.10% of C, 0.2%-0.5% of Mn, 0.5%-0.8% of Ni, 0.3%-0.6% of Cr, 0.2%-0.4% of Mo, 0.1%-0.3% of Zr, 0.001%-0.005% of S, 0.001%-0.005% of P and the balance iron and inevitable impurities. The problem that the hardness and the impact resistance of the gear repaired by the surfacing welding rod in the related technology are poor is solved.

Description

Technical Field

[0001] The invention relates to the technical field of cladding electrodes, and in particular to a cladding electrode for repairing gear wear and a preparation method thereof. Background Art

[0002] Overlay welding refers to the process of depositing filler metal on the surface of the parent material. Overlay welding can provide the dimensions and performance required to meet the product's use requirements, such as corrosion resistance, impact resistance, heat resistance, etc. The welding rod used for overlay welding to obtain a wear-resistant or corrosion-resistant metal surface is called an overlay welding rod. Overlay welding rods are often used to repair old and waste materials. For example, they can be used to repair gear wear to increase the service life of the gear and reduce the overall cost. Overlay welding rods can be divided into pearlite overlay welding rods, martensite overlay welding rods, manganese austenite overlay welding rods, etc. according to different use conditions and hardness requirements. With the current increase in use requirements, the hardness and impact resistance of gears repaired by existing overlay welding rods need to be further improved. Summary of the invention

[0003] The invention provides a cladding electrode for repairing gear wear and a preparation method thereof, which solves the problem of poor hardness and impact resistance of gears repaired by cladding electrodes in the related art.

[0004] The technical solution of the present invention is as follows: The present invention provides a cladding electrode for gear wear repair, comprising a welding core and a welding skin covering the welding core. The welding skin comprises the following components in parts by weight: 35-40 parts of marble, 10-20 parts of fluorite, 30-40 parts of high carbon ferrochrome, 5-8 parts of magnesium nitride, 15-30 parts of titanium nitride, 1-3 parts of vanadium, and 2-5 parts of zinc oxide; The welding core is composed of the following components in weight percentage: C 0.05%-0.10%, Mn 0.2%-0.5%, Ni 0.5%-0.8%, Cr 0.3%-0.6%, Mo 0.2%-0.4%, Zr 0.1%-0.3%, S 0.001%-0.005%, P 0.001%-0.005%, and the rest is iron and inevitable impurities.

[0005] As a further technical solution, the solder paste further includes cerium oxide and bismuth oxide in a mass ratio of 1:4 to 4:1.

[0006] The present invention further improves the hardness and impact resistance of the cladding layer by limiting the welding skin to further include cerium oxide and bismuth oxide in a mass ratio of 1:4 to 4:1.

[0007] As a further technical solution, the mass ratio of the cerium oxide and bismuth oxide to zinc oxide is 0.5-3.5:5.

[0008] The present invention further improves the hardness and impact resistance of the cladding layer by limiting the mass ratio of cerium oxide and bismuth oxide to zinc oxide to 0.5-3.5:5.

[0009] As a further technical solution, the mass ratio of cerium oxide to bismuth oxide is 2:3~3:2.

[0010] The present invention further improves the hardness and impact resistance of the cladding layer by limiting the mass ratio of cerium oxide to bismuth oxide to 2:3-3:2.

[0011] As a further technical solution, the mass ratio of the cerium oxide, bismuth oxide and zinc oxide to vanadium is 8.5:1.5~2.5.

[0012] The present invention further improves the hardness and impact resistance of the cladding layer by limiting the mass ratio of cerium oxide, bismuth oxide and zinc oxide to vanadium to 8.5:1.5-2.5.

[0013] As a further technical solution, the composition of the high carbon ferrochrome includes chromium with a mass content of 62% to 72%, carbon with a mass content of ≤6%, and silicon with a mass content of ≤3%.

[0014] As a further technical solution, the diameter of the welding core is 1.5-2 mm, and the thickness of the welding skin is 0.5-1 mm.

[0015] The present invention also provides a method for preparing a cladding electrode for gear wear repair, comprising the following steps: The components in parts by weight in the welding skin are mixed uniformly, and a binder is applied to the outside of the welding core by pressure to obtain a surfacing welding rod for repairing gear wear.

[0016] As a further technical solution, the binder includes water glass.

[0017] The present invention also proposes the use of the cladding welding rod for gear wear repair or the cladding welding rod prepared by the preparation method of the cladding welding rod for gear wear repair in gear wear repair.

[0018] The working principle and beneficial effects of the present invention are: In the present invention, CaO-CaF 2 As a slag system, the system improves the deoxidation and desulfurization capabilities of the slag. By adding vanadium and zinc oxide to the weld skin of the cladding electrode, during the use of the cladding electrode, on the one hand, the surface tension of the molten iron is reduced, making it easier for the impurities in the slag to float out, effectively reducing the impurity content in the cladding layer; on the other hand, the possibility of white spots and thermal cracks is reduced, thereby reducing the defects of the cladding layer. At the same time, through the adjustment and optimization of the content between the components, the hardness and impact resistance of the gears repaired by the cladding electrode are improved. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the following examples and comparative examples, the parameters of the raw materials are as follows: The marble grade is DM-120, purchased from Qingyuan Demao Chemical Co., Ltd.; The grade of fluorite is rm-01, wherein the mass content of calcium fluoride is ≥97%, the mass content of silicon dioxide is ≤1.2%, the mass content of calcium carbonate is ≤0.8%, the mass content of sulfur is ≤0.03%, and the mass content of carbon is ≤0.02%, which is purchased from Shijiazhuang Ruiming Mineral Products Co., Ltd.; The grade of high carbon ferrochrome is FeCr67C6.0, wherein the mass content of chromium is 62% to 72%, the mass content of carbon is ≤6%, the mass content of silicon is ≤3%, and the mass content of phosphorus is ≤0.03%, which is purchased from Qinghe County Yaoxie Metal Materials Co., Ltd. The binder is water glass.

[0021] Example 1 A cladding electrode for repairing gear wear, comprising a welding core and a welding cover covering the welding core, wherein the welding core is composed of the following components in weight percentage: C 0.05%, Mn 0.2%, Ni 0.5%, Cr 0.3%, Mo 0.2%, Zr 0.1%, S 0.001%, P 0.001%, and the rest is iron and unavoidable impurities; The preparation method thereof comprises the following steps: Mix 35 parts of marble, 10 parts of fluorite, 30 parts of high carbon ferrochrome, 5 parts of magnesium nitride, 15 parts of titanium nitride, 1 part of vanadium and 5 parts of zinc oxide evenly, apply it on a welding core with a diameter of 2 mm with a binder, and dry it to obtain a cladding electrode for gear wear repair with a weld skin thickness of 1 mm.

[0022] Example 2 A cladding electrode for repairing gear wear, comprising a welding core and a welding cover covering the welding core, wherein the welding core is composed of the following components in weight percentage: C 0.10%, Mn 0.5%, Ni 0.8%, Cr 0.6%, Mo 0.4%, Zr 0.3%, S 0.005%, P 0.005%, and the rest is iron and unavoidable impurities; The preparation method thereof comprises the following steps: Mix 40 parts of marble, 20 parts of fluorite, 40 parts of high carbon ferrochrome, 8 parts of magnesium nitride, 30 parts of titanium nitride, 3 parts of vanadium and 2 parts of zinc oxide evenly, apply it on a welding core with a diameter of 2 mm with a binder, and dry it to obtain a cladding electrode for gear wear repair with a weld skin thickness of 1 mm.

[0023] Example 3 A cladding electrode for repairing gear wear, comprising a welding core and a welding cover covering the welding core, wherein the welding core is composed of the following components in weight percentage: C 0.05%, Mn 0.2%, Ni 0.5%, Cr 0.3%, Mo 0.2%, Zr 0.1%, S 0.001%, P 0.001%, and the rest is iron and unavoidable impurities; The preparation method thereof comprises the following steps: Mix 35 parts of marble, 10 parts of fluorite, 30 parts of high carbon ferrochrome, 5 parts of magnesium nitride, 15 parts of titanium nitride, 1 part of vanadium, 5 parts of zinc oxide, 0.05 parts of cerium oxide, and 0.2 parts of bismuth oxide evenly, apply it on a welding core with a diameter of 2 mm with a binder, and dry it to obtain a cladding electrode for gear wear repair with a weld skin thickness of 1 mm.

[0024] Example 4 The only difference from Example 3 is: 0.8 parts of cerium oxide and 3.2 parts of bismuth oxide.

[0025] Example 5 The only difference from Example 3 is: 0.1 part of cerium oxide and 0.4 part of bismuth oxide.

[0026] Example 6 The only difference from Example 3 is: 0.7 parts of cerium oxide and 2.8 parts of bismuth oxide.

[0027] Example 7 The only difference from Example 3 is: 2.8 parts of cerium oxide and 0.7 parts of bismuth oxide.

[0028] Example 8 The only difference from Example 3 is: 1.4 parts of cerium oxide and 2.1 parts of bismuth oxide.

[0029] Example 9 The only difference from Example 3 is: 2.1 parts of cerium oxide and 1.4 parts of bismuth oxide.

[0030] Example 10 The only difference from Example 8 is: 3 parts of vanadium.

[0031] Embodiment 11 The only difference from Example 8 is: 1.5 parts of vanadium.

[0032] Example 12 The only difference from Example 8 is: 2.5 parts of vanadium.

[0033] Comparative Example 1 The only difference from Example 1 is that zinc oxide is replaced by an equal amount of zinc borate.

[0034] Comparative Example 2 A cladding electrode for repairing gear wear, comprising a welding core and a welding cover covering the welding core, wherein the welding core is composed of the following components in weight percentage: C 0.05%, Mn 0.2%, Ni 0.5%, Cr 0.3%, Mo 0.2%, Ti 0.1%, S 0.001%, P 0.001%, and the rest is iron and unavoidable impurities; The preparation method thereof comprises the following steps: Mix 35 parts of marble, 10 parts of fluorite, 30 parts of high carbon ferrochrome, 5 parts of magnesium nitride, 15 parts of titanium nitride, 1 part of vanadium and 5 parts of zinc oxide evenly, apply it on a welding core with a diameter of 2 mm with a binder, and dry it to obtain a cladding electrode for gear wear repair with a weld skin thickness of 1 mm.

[0035] Test example The welding part of the worn gear to be repaired is heated to 150°C and kept warm; the worn gear to be repaired is welded using the cladding electrodes for gear wear repair prepared in Examples 1 to 12 and Comparative Examples 1 to 2 at a current of 80A and a voltage of 18V, and the thickness of the cladding layer is 4mm; the welded gear is kept warm at 300°C for 30min, cooled by wrapping with asbestos, and the gear repaired by the cladding electrodes is obtained.

[0036] The worn gear to be repaired is 38CrSiMnMo medium carbon quenched and tempered steel, specifically composed of the following components in mass percentage: C: 0.38%, Si: 1.22%, Mn: 0.98%, Cr: 1.33%, Mo: 0.24%, S: 0.011%, P: 0.009%, and the remainder is Fe and unavoidable impurities.

[0037] The gears repaired by cladding electrodes were polished into specimens of 10mm×10mm×55mm. The hardness of the specimens was tested with reference to the test method of GB / T 230.1-2018, using an HRC ruler and a diamond cone indenter on 4 equally spaced different axial sections. The impact resistance of the specimens was tested with reference to the test method of GB / T 229-2020, using a V-notch, a notch depth of 2mm, and an experimental temperature of 0°C. The results are shown in Table 1.

[0038] Table 1 Hardness and impact resistance test results of Examples 1 to 12 and Comparative Examples 1 to 2

[0039] Compared with Comparative Examples 1-2, zinc oxide is added to the weld coating of the cladding electrode for gear wear repair prepared in Example 1. As a result, the hardness and impact energy of Example 1 are higher than those of Comparative Examples 1-2, indicating that adding zinc oxide to the weld coating of the cladding electrode for gear wear repair can improve the hardness and impact resistance of the gear repaired by the cladding electrode.

[0040] Compared with Example 1, cerium oxide and bismuth oxide in a mass ratio of 1:4 to 4:1 were added to the weld skin of the cladding welding rod for gear wear repair prepared in Examples 3 to 4. As a result, the hardness and impact energy of Examples 3 to 4 were higher than those of Example 1, indicating that adding cerium oxide and bismuth oxide in a mass ratio of 1:4 to 4:1 to the weld skin of the cladding welding rod for gear wear repair further improved the hardness and impact resistance of the gear repaired by the cladding welding rod.

[0041] Compared with Examples 3 to 4, the mass ratio of cerium oxide and bismuth oxide to zinc oxide in the weld skin of the gear wear repair cladding electrodes prepared in Examples 5 to 6 is 0.5 to 3.5:5. As a result, the hardness and impact energy of Examples 5 to 6 are higher than those of Examples 3 to 4, indicating that the mass ratio of cerium oxide and bismuth oxide to zinc oxide in the weld skin is 0.5 to 3.5:5, which further improves the hardness and impact resistance of the gear repaired by the cladding electrodes.

[0042] Compared with Examples 6-7, the mass ratio of cerium oxide to bismuth oxide in the weld skin of the gear wear repair cladding electrodes prepared in Examples 8-9 is 2:3-3:2. As a result, the hardness and impact energy of Examples 8-9 are higher than those of Examples 6-7, indicating that the mass ratio of cerium oxide to bismuth oxide is 2:3-3:2, which further improves the hardness and impact resistance of the gear repaired by the cladding electrodes.

[0043] Compared with Example 8 and Example 10, the mass ratio of cerium oxide, bismuth oxide and zinc oxide to vanadium in the weld skin of the gear wear repair cladding electrode prepared in Examples 11-12 is 8.5:1.5-2.5. As a result, the hardness and impact energy of Examples 11-12 are higher than those of Examples 8 and 10, indicating that the mass ratio of cerium oxide, bismuth oxide and zinc oxide to vanadium is 8.5:1.5-2.5, which further improves the hardness and impact resistance of the gear repaired by the cladding electrode.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A surfacing electrode for gear wear repair, characterized in that: It includes a welding core and a welding skin covering the welding core. The welding skin comprises the following components in parts by weight: 35-40 parts of marble, 10-20 parts of fluorite, 30-40 parts of high carbon ferrochrome, 5-8 parts of magnesium nitride, 15-30 parts of titanium nitride, 1-3 parts of vanadium, and 2-5 parts of zinc oxide; The welding core is composed of the following components in weight percentage: C 0.05%-0.10%, Mn 0.2%-0.5%, Ni 0.5%-0.8%, Cr 0.3%-0.6%, Mo 0.2%-0.4%, Zr 0.1%-0.3%, S 0.001%-0.005%, P 0.001%-0.005%, and the rest is iron and inevitable impurities.

2. A surfacing welding rod for gear wear repair according to claim 1, characterized in that: The solder paste also includes cerium oxide and bismuth oxide in a mass ratio of 1:4 to 4:

1.

3. A surfacing electrode for gear wear repair according to claim 2, characterized in that: The mass ratio of the cerium oxide and bismuth oxide to zinc oxide is 0.5-3.5:

5.

4. A surfacing electrode for gear wear repair according to claim 3, characterized in that: The mass ratio of the cerium oxide to the bismuth oxide is 2:3 to 3:

2.

5. A surfacing electrode for gear wear repair according to claim 4, characterized in that: The mass ratio of the cerium oxide, bismuth oxide and zinc oxide to vanadium is 8.5:1.5-2.

5.

6. The surfacing welding rod for gear wear repair according to claim 1, characterized in that: The high carbon ferrochrome comprises 62% to 72% by mass of chromium, 6% by mass of carbon, and 3% by mass of silicon.

7. The surfacing welding rod for gear wear repair according to claim 1, characterized in that: The diameter of the welding core is 1.5-2 mm, and the thickness of the welding skin is 0.5-1 mm.

8. The method for preparing a cladding electrode for gear wear repair according to any one of claims 1 to 7, characterized in that: The following steps are involved: The components in parts by weight in the welding skin are mixed uniformly, and a binder is applied to the outside of the welding core by pressure to obtain a surfacing welding rod for repairing gear wear.

9. The method for preparing a cladding electrode for gear wear repair according to claim 8, characterized in that: The binder includes water glass.

10. Use of a cladding welding rod for gear wear repair according to any one of claims 1 to 7 or a cladding welding rod prepared by the method for preparing a cladding welding rod for gear wear repair according to any one of claims 8 to 9 in gear wear repair.

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