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Anti-erosion and anti-wear stainless steel welding electrode for hydroelectric generating set repairing and preparation method of anti-erosion and anti-wear stainless steel welding electrode

A hydroelectric unit, stainless steel technology, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problem of reducing corrosion resistance and wear resistance of weld seams, unsuitable for repairing hydroelectric units, mismatching of mechanics and corrosion resistance, etc. problems, to achieve the effect of less redness and cracking, the best recovery of operating performance, and stable arc

Active Publication Date: 2018-04-13
ATLANTIC CHINA WELDING CONSUMABLES
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AI Technical Summary

Problems solved by technology

[0005] 1. The patented electrode whose publication number is CN102430876A and whose invention name is "A Nickel-based Electrode for Welding Nickel-Chromium-Molybdenum Alloy Steel", this type of electrode belongs to the nickel-based nickel alloy electrode, and is mainly used for welding nickel-chromium-molybdenum alloys. The deposited metal composition is: C: 0.021%, Mn: 0.42%, Si: 0.38%, S: 0.008%, P: 0.01%, Cr: 21.9%, Mo: 8.75%, Fe: 5.8%, Co: 0.06 %, Cu: 0.02%, Nb: 3.42%, the balance is Ni and unavoidable impurities; its mechanical properties: tensile strength (MPa) 830, yield strength (MPa) 540, the chemical composition and mechanical properties of the deposited metal The corrosion resistance and corrosion resistance of the hydroelectric unit do not match the martensitic stainless steel base material, and the cost is too high, so it is not suitable for the repair work of the hydroelectric unit
[0006] 2. The patented electrode whose publication number is CN102357745A and whose invention name is "An Electric Welding Electrode for Welding X60 Grade Pipeline Steel", this type of electrode belongs to low alloy steel electrodes, and its deposited metal chemical composition (wt%) is: C: 0.075, Mn: 1.37, Si: 0.27, S: 0.004, P: 0.016, Ni: 0.235, Cr: 0.025, Fe: 97.175, the balance is impurities; its mechanical properties: tensile strength (MPa) 560, yield strength ( MPa) 450, especially the low chromium content of the deposited metal, which greatly reduces the corrosion resistance and wear resistance of the weld, and it is difficult to meet the corrosion and wear resistance requirements of the martensitic steel repair of the hydropower unit. The tensile strength (MPa) is greater than Minimum requirement of 760

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] The welding core composition is (wt%): C: 0.010%, Mn: 0.18%, Si: 0.12%, Cr: 12.14%, Ni: 4.25%, Cu: 0.023%, Mo: 0.47%, S: 0.016%, P: 0.017%, the balance is Fe and essential impurities, and the welding core is chromium-nickel-molybdenum alloy welding core.

[0097] Take the drug skin, the weight of each component in the drug skin is as follows: 9.0 kg of marble containing CaCO3 98.40%; 2 97.30% Fluorite 2.0kg; Contains SiO 2 63.6%, Al 2 o 3 17.3%, K 2 O+Na 2 O 16.0% feldspar powder 8.0kg; containing TiO 2 12.0kg of 96.5% rutile; 1.0kg of electrolytic manganese containing Mn99.7%; 2.0kg of silicon dioxide containing Si45.5%; 0.4kg of ferromolybdenum containing Mo57.3%; metal nickel powder containing Ni99.8% 0.6kg; 4.5kg of metallic chromium containing Cr99.1%.

[0098] After mixing the above powder evenly, add 6.8 kg of potassium sodium water glass with a concentration of 40°-45° and mix evenly, then send it into the plodder to wrap it on the welding core, and then ...

Embodiment 2

[0102] This embodiment is all the same as Example 1 except that the weights of the ingredients in the drug skin are different.

[0103] The weight of each component in the medicine skin in the present embodiment is as follows: 10.0kg of marble containing 98.40% of CaCO3; 3.5kg of fluorite containing 97.30% of CaF2; 3.0kg stone powder; 8.0kg rutile containing TiO296.5%; 0.5kg electrolytic manganese containing Mn99.7%; 1.0kg silicon dioxide containing Si45.5%; 0.2kg ferromolybdenum containing Mo57.3%; containing Ni99 .8% metallic nickel powder 0.8kg; 6.0kg metallic chromium containing Cr99.1%.

[0104] The obtained rutile stainless steel electrode 2 used for repairing corrosion and wear resistance of hydropower units was subjected to welding experiments, and its deposited metal composition: C: 0.032%, Mn: 0.50%, Si: 0.15%, Cr: 13.80%, Ni : 4.85%, Mo: 0.45%, Cu: 0.025%, S: 0.009%, P: 0.015%, and the balance is unavoidable impurities.

[0105] Deposited metal heat treatment 610℃...

Embodiment 3

[0107] This embodiment is all the same as Example 1 except that the weights of the ingredients in the drug skin are different.

[0108] The weight of each component in the drug skin in the present embodiment is as follows: 8.0kg of marble containing 98.40% of CaCO3; 0.5kg of fluorite containing 97.30% of CaF2; 5.0kg stone powder; 16.0kg rutile containing 96.5% TiO2; 1.5kg electrolytic manganese containing 99.7% Mn; 1.5kg silicon dioxide containing 45.5% Si; 0.6kg ferromolybdenum containing 57.3% Mo; .8% metallic nickel powder 0.4kg; metallic chromium containing 99.1% Cr 5.2kg.

[0109] The obtained rutile stainless steel electrode 3 used for repairing corrosion and wear resistance of hydropower units was subjected to welding experiments, and its deposited metal composition: C: 0.030%, Mn: 0.90%, Si: 0.30%, Cr: 13.44%, Ni : 4.32%, Mo: 0.63%, Cu: 0.020%, S: 0.010%, P: 0.020%, and the balance is unavoidable impurities.

[0110]Deposited metal heat treatment 610℃×1h, its mechani...

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Abstract

The invention discloses an anti-erosion and anti-wear stainless steel welding electrode for hydroelectric generating set repairing and a preparation method of the anti-erosion and anti-wear stainlesssteel welding electrode. The anti-erosion and anti-wear stainless steel welding electrode comprises a chromium-nickel-molybdenum alloy core wire and a coating covering the surface of the core wire, wherein the coating is prepared from the following components: 8.0 to 10.0 weight parts of marble, 0.5 to 3.5 weight parts of fluorite, 3.0 to 8.0 weight parts of feldspar powder, 8.0 to 16.0 weight parts of rutile, 0.5 to 1.5 weight parts of electrolytic manganese, 1.0 to 2.0 weight parts of silicon dioxide, 0.2 to 0.6 weight part of ferro-molybdenum, 0.4 to 0.8 weight part of metal nickel powder and 4.5 to 6.0 weight parts of metal chromium. Under a condition that the intensity of the welding electrode is more than 900 MPa, the impact work of the anti-erosion and anti-wear stainless steel welding electrode at 20 DEG C can reach 50 J or higher.

Description

technical field [0001] The invention relates to the technical field of welding material preparation, and more specifically relates to a corrosion-resistant and wear-resistant stainless steel welding electrode for repairing hydropower units and a preparation method thereof. Background technique [0002] Hydropower is a green energy, renewable energy, low operating costs, convenient for power peak regulation, and conducive to improving resource utilization and comprehensive economic and social benefits. Calling for the adoption of clean energy, green energy, and renewable energy, reducing harmful emissions has become the main way to reduce environmental pollution. China has built various conventional hydropower stations such as Gezhouba, Wujiangdu, Baishan, Longyangxia and Yili River cascades, as well as large-scale pumped storage power stations such as Panjiakou and the experimental Jiangxia tidal power station. In the future, the construction of conventional hydropower stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/365B23K35/36B23K35/30B23K35/40
CPCB23K35/3086B23K35/3608B23K35/365B23K35/40
Inventor 刘奇望蒋勇李欣雨袁宁白昶姚军
Owner ATLANTIC CHINA WELDING CONSUMABLES
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