High-strength damping alloy matching electrode

Abstract

The application belongs to the technical field of welding materials, and specifically provides a high-strength damping alloy matching electrode, which comprises a welding core and a coating, and the coating comprises the following components in percentage of the total mass of the coating: 20-40% of rutile, 20-30% of fluorite, 5-7% of mica, 5-7% of strontium carbonate, 4-6% of atomized ferrosilicon, 5-8% of electrolytic manganese, 0.5-1% of rare earth fluoride, and the balance of iron powder. The high-strength damping alloy matching electrode has good all-position welding process performance and excellent mechanical properties, the average value of deposited metal-20 DEG C KV2 is greater than 80 J, the weld is beautiful, and the damping steel welding requirements can be met.

Description

Technical Field

[0001] This invention belongs to the field of welding materials technology, specifically relating to a high-strength damping alloy welding electrode. Background Technology

[0002] Materials that can convert mechanical vibration into heat energy dissipation, thereby reducing noise and vibration, are collectively referred to as damping materials. Iron-based damping alloys mainly include Fe-C, Fe-Cr, Fe-Al, and Fe-Mn damping alloys. Fe-C damping alloys are cast iron, a multiphase alloy, inexpensive and easy to produce. However, cast iron has low strength, poor corrosion resistance, and high brittleness, making it difficult to meet the mechanical performance requirements of manufactured components, and its damping performance is relatively low. Fe-Al and Fe-Cr damping alloys are both ferromagnetic damping alloys. While Fe-Al damping alloys have good damping performance and strength, they suffer from significant brittleness. Fe-Cr damping alloys have good damping performance but poor toughness. Fe-Mn damping alloys have good damping performance, good mechanical properties, good machinability, and low cost, making them suitable for widespread, high-volume applications.

[0003] Currently, there is a lack of welding electrodes that can be used with Fe-Mn damping alloys. This invention develops a high-strength welding electrode that can be used with Fe-Mn damping steel. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem of the lack of matching welding electrodes for Fe-Mn damping alloys in the prior art.

[0005] To this end, the present invention provides a high-strength damping alloy welding electrode, comprising a core and a coating. The coating comprises the following components by weight percentage: 20-40% rutile, 20-30% fluorite, 5-7% mica, 5-7% strontium carbonate, 4-6% atomized ferrosilicon, 5-8% electrolytic manganese, 0.5-1% rare earth fluorides, and the balance being iron powder.

[0006] Specifically, based on the total mass percentage of the welding core, the welding core comprises the following components: 3.5-5.5% Mn, 20-22% Cr, 9-10% Ni, 2.5-3.5% Mo, 0.25-0.35% N, C≤0.05%, Si≤0.60%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0007] Specifically, the mass ratio of the welding core to the flux coating is 7:3.

[0008] Specifically, the outer diameter of the aforementioned welding rod is 6.3-6.4 mm.

[0009] Specifically, based on the total mass percentage of the coating, the coating comprises the following components: 20% 90° rutile, 20% fluorite, 5% mica, 5% strontium carbonate, 4% 45# atomized ferrosilicon, 5% electrolytic manganese, 0.5% rare earth fluoride, and the balance being iron powder.

[0010] Specifically, the welding rods mentioned above, by percentage of total core mass, comprise the following components: 5.5% Mn, 22% Cr, 10% Ni, 3.5% Mo, 0.35% N, 0.05% C, 0.40% Si, 0.03% S, 0.03% P, with the balance being iron and unavoidable impurities.

[0011] Specifically, based on the total mass percentage of the coating, the coating comprises the following components: 40% 90° rutile, 30% fluorite, 7% mica, 7% strontium carbonate, 6% 45# atomized ferrosilicon, 8% electrolytic manganese, 1% rare earth fluoride, and the balance being iron powder.

[0012] Specifically, in the above-mentioned welding rod, the welding core comprises the following components by percentage of total mass: 3.5% Mn, 20% Cr, 9% Ni, 2.5% Mo, 0.25% N, 0.04% C, 0.30% Si, 0.006% S, 0.01% P, with the balance being iron and unavoidable impurities.

[0013] Specifically, based on the total mass percentage of the coating, the coating comprises the following components: 30% 90° rutile, 25% fluorite, 6% mica, 6% strontium carbonate, 5% 45# atomized ferrosilicon, 6.5% electrolytic manganese, 0.7% rare earth fluorides, and the balance being iron powder.

[0014] Specifically, in the above-mentioned welding rod, the welding core comprises the following components by percentage of total mass: 4% Mn, 21% Cr, 9.5% Ni, 3% Mo, 0.3% N, 0.03% C, 0.40% Si, 0.007% S, 0.008% P, with the balance being iron and unavoidable impurities.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] The high-strength damping alloy welding electrode provided by this invention has good all-position welding process performance and excellent mechanical properties. Its deposited metal has an average KV2 value of >80J at -20℃, and the weld is aesthetically pleasing, which can meet the welding requirements of damping steel. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Although representative embodiments of the present invention have been described in detail, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the embodiments, but should be defined by the appended claims and their equivalents.

[0018] This invention provides a high-strength damping alloy welding electrode, comprising a core and a coating, wherein the mass ratio of the core to the coating is 7:3, and the outer diameter of the electrode is preferably 6.3-6.4 mm.

[0019] The coating comprises the following components by weight percentage: 20-40% rutile, 20-30% fluorite, 5-7% mica, 5-7% strontium carbonate, 4-6% atomized ferrosilicon, 5-8% electrolytic manganese, 0.5-1% rare earth fluorides, with the balance being iron powder for filling.

[0020] The design principles for the flux composition of the high-strength damping alloy welding electrode of this invention are as follows:

[0021] Strontium carbonate decomposes at high temperatures to produce CO2, which mainly serves to form slag and gas. When the strontium carbonate content is too low, it cannot provide protection, while when the content is too high, it will increase the spatter of the welding rod. Therefore, the strontium carbonate content should be controlled at 5-7%.

[0022] Fluorite's main component is CaF2, which primarily functions to form slag, generate gas, and improve the fluidity of molten slag. When the fluorite content is too low, it cannot provide protection, while an excessive content will cause the molten slag to flow and the forming to deteriorate. Therefore, the fluorite content should be controlled at 20-30%.

[0023] Mica's main components are SiO2, K2O, and Na2O, which improve slag fluidity and stabilize the electric arc. When the content is too high, it will cause difficulty in slag removal, while when the content is too low, it will result in poor slag fluidity of the welding rod. Therefore, the content of silicon micropowder should be controlled at 5-7%.

[0024] The main component of 98° rutile is TiO2, which plays a role in calming the molten pool. When the TiO2 content is too high, the impact performance will be poor, while when the content is too low, the welding electrode's process performance will be poor. Therefore, the content of 98° rutile should be controlled between 20-40%.

[0025] 45# atomized ferrosilicon plays a deoxidizing role. When the content of 45# atomized ferrosilicon is too low, the deoxidation is insufficient, resulting in poor impact performance. On the other hand, if the content is too high, the strength will be too high and the performance will be poor. Therefore, the content of 45# atomized ferrosilicon should be controlled at 4-6%.

[0026] Electrolytic manganese plays a role in deoxidation and alloy transition, and the content of electrolytic manganese is controlled at 5-8%.

[0027] Rare earth fluorides serve to purify weld seams. Because rare earth elements are relatively expensive, the content of rare earth fluorides is controlled at 0.5-1%.

[0028] The welding core comprises, by weight percentage, the following components: 3.5-5.5% Mn, 20-22% Cr, 9-10% Ni, 2.5-3.5% Mo, 0.25-0.35% N, C≤0.05%, Si≤0.60%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0029] The design principles for the preferred core composition of the high-strength damping alloy welding electrode of this invention are as follows:

[0030] Carbon (C) is a solid solution strengthening element that can improve the strength of weld metal and has a significant impact on its toughness. When the C content is low, it can effectively improve the toughness of the weld metal; when the C content is high, the weld metal is more prone to cracking. Therefore, the C content should be reduced as much as possible and controlled to ≤0.05%.

[0031] Mn is the main deoxidizer, which reduces the oxygen content of weld metal, increases the strength and crack resistance of weld metal, improves low-temperature impact toughness, and regulates the fluidity of molten iron. However, as the Mn content increases, it will cause hard phases in the microstructure due to segregation, which will reduce the weld metal's resistance to hydrogen sulfide corrosion. Therefore, the Mn content should be controlled at 3.5-5.5%.

[0032] Si is the main deoxidizer, and its deoxidation effect is better when combined with Mn. It reduces the oxygen content of the weld metal, improves the low-temperature impact toughness, and regulates the fluidity of molten iron. However, if too much Si is added, the molten iron becomes sticky, the weld strength is too high, and the low-temperature impact toughness is reduced. Therefore, the Si content is limited to ≤0.6%.

[0033] P is an impurity element that severely affects the weld metal's resistance to hydrogen sulfide and reduces its low-temperature impact toughness. S forms sulfide inclusions with elements such as Fe, which can induce pitting corrosion and stress corrosion cracking. P has a strong segregation effect, causing unevenness in the weld metal, especially increasing cold brittleness. Therefore, the content of S and P should be minimized, with S content limited to ≤0.03% and P content limited to ≤0.03%.

[0034] Ni can improve the low-temperature impact toughness of weld metal, but excessive amounts are expensive. Considering all factors, the content in the core material is controlled at 9-10%.

[0035] Cr is one of the most important alloying elements for improving corrosion resistance, and the Cr content in the welding core should be controlled at 20-22%.

[0036] Mo is one of the most important alloying elements for improving corrosion resistance, and the Mo content in the welding core should be controlled at 2.5-3.5%.

[0037] Nitrogen (N) is one of the elements that improve strength. Too much nitrogen will cause nitrogen porosity, while too little nitrogen will not significantly improve strength. The nitrogen content in the welding core should be controlled between 0.25% and 0.35%.

[0038] The effects of the high-strength damping alloy welding rod of the present invention will be studied through specific embodiments below.

[0039] Example 1:

[0040] This embodiment provides a high-strength damping alloy welding electrode, comprising a core and a coating. The coating comprises the following components by weight percentage: 20% 98° rutile, 20% fluorite, 5% mica, 5% strontium carbonate, 45# atomized ferrosilicon, 5% electrolytic manganese, 0.5% rare earth fluoride, with the balance being iron powder. The core comprises the following components by weight percentage: C: 0.05%, Mn: 5.5%, Si: 0.40%, S: 0.03%, P: 0.03%, Cr: 22%, Ni: 10%, Mo: 3.5%, N: 0.35%, with the balance being iron and unavoidable impurities.

[0041] The mass ratio of the core to the coating in the welding electrode is 7:3, and the outer diameter of the welding electrode is 6.4 mm.

[0042] The chemical composition of the weld metal of the electrode prepared in this embodiment was tested, and the results are shown in Table 1. The mechanical properties and damping properties of the weld metal were tested, and the results are shown in Table 2.

[0043] Example 2:

[0044] This embodiment provides a high-strength damping alloy welding electrode, comprising a core and a coating. The coating comprises the following components by weight percentage: 40% 98° rutile, 30% fluorite, 7% mica, 7% strontium carbonate, 6% 45# atomized ferrosilicon, 8% electrolytic manganese, 1% rare earth fluoride, with the balance being iron powder. The core comprises the following components by weight percentage: C: 0.04%, Mn: 3.5%, Si: 0.30%, S: 0.006%, P: 0.01%, Cr: 20%, Ni: 9%, Mo: 2.5%, N: 0.25%, with the balance being iron and unavoidable impurities.

[0045] The mass ratio of the core to the coating in the welding electrode is 7:3, and the outer diameter of the welding electrode is 6.3 mm.

[0046] The chemical composition of the weld metal of the electrode prepared in this embodiment was tested, and the results are shown in Table 1. The mechanical properties and damping properties of the weld metal were tested, and the results are shown in Table 2.

[0047] Example 3:

[0048] This embodiment provides a high-strength damping alloy welding electrode, comprising a core and a coating. The coating comprises the following components by weight percentage: 30% 98° rutile, 25% fluorite, 6% mica, 6% strontium carbonate, 5% 45# atomized ferrosilicon, 6.5% electrolytic manganese, 0.7% rare earth fluoride, with the balance being iron powder. The core comprises the following components by weight percentage: C: 0.03%, Mn: 4%, Si: 0.40%, S: 0.007%, P: 0.008%, Cr: 21%, Ni: 9.5%, Mo: 3%, N: 0.3%, with the balance being iron and unavoidable impurities.

[0049] The mass ratio of the core to the coating in the welding electrode is 7:3, and the outer diameter of the welding electrode is 6.35 mm.

[0050] The chemical composition of the weld metal of the electrode prepared in this embodiment was tested, and the results are shown in Table 1. The mechanical properties and damping properties of the weld metal were tested, and the results are shown in Table 2.

[0051] Table 1: Chemical composition (%) of electrode deposited metal

[0052] serial number C Si Mn S P Ni Cr Mo N Example 1 0.051 0.41 5.0 0.015 0.016 9.5 21.3 3.3 0.31 Example 2 0.037 0.35 2.9 0.006 0.007 8.4 19.3 2.4 0.21 Example 3 0.035 0.37 3.7 0.010 0.010 9.1 20.7 2.9 0.25

[0053] Table 2: Mechanical properties of electrode deposited metal

[0054] serial number Rm / MPa Elongation A / % <![CDATA[KV2(-20℃) / J]]> Damping performance Example 1 749 37 105、107、113 <![CDATA[0.75×10 -3 ]]> Example 2 758 35 115、121、102 <![CDATA[0.80×10 -3 ]]> Example 3 783 38 102、115、100 <![CDATA[0.82×10 -3 ]]>

[0055] In summary, the chemical composition, mechanical properties, and damping properties of the deposited metal of the damping steel welding electrode provided by this invention can all meet the requirements for damping steel welding.

[0056] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A high-strength damping alloy welding electrode, comprising a core and a coating, characterized in that, The coating comprises, by weight percentage, the following components: 20-40% rutile, 20-30% fluorite, 5-7% mica, 5-7% strontium carbonate, 4-6% atomized ferrosilicon, 5-8% electrolytic manganese, 0.5-1% rare earth fluorides, with the balance being iron powder; the core comprises, by weight percentage, the following components: 3.5-5.5% Mn, 20-22% Cr, 9-10% Ni, 2.5-3.5% Mo, 0.25-0.35% N, C≤0.05%, Si≤0.60%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

2. The high-strength damping alloy welding electrode as described in claim 1, characterized in that: The mass ratio of the welding core to the flux coating is 7:

3.

3. The high-strength damping alloy welding electrode as described in claim 1, characterized in that: The outer diameter of the welding electrode is 6.3-6.4 mm.

4. The high-strength damping alloy welding electrode as described in claim 1, characterized in that, The coating comprises the following components by weight percentage: 20% 98° rutile, 20% fluorite, 5% mica, 5% strontium carbonate, 4% 45# atomized ferrosilicon, 5% electrolytic manganese, 0.5% rare earth fluoride, and the balance being iron powder.

5. The high-strength damping alloy welding electrode as described in claim 4, characterized in that, The welding core comprises the following components by weight percentage: 5.5% Mn, 22% Cr, 10% Ni, 3.5% Mo, 0.35% N, 0.05% C, 0.40% Si, 0.03% S, 0.03% P, with the balance being iron and unavoidable impurities.

6. The high-strength damping alloy welding electrode as described in claim 1, characterized in that, The coating comprises the following components by weight percentage: 40% 98° rutile, 30% fluorite, 7% mica, 7% strontium carbonate, 6% 45# atomized ferrosilicon, 8% electrolytic manganese, 1% rare earth fluoride, and the balance being iron powder.

7. The high-strength damping alloy welding electrode as described in claim 6, characterized in that, The welding core comprises the following components by weight percentage: 3.5% Mn, 20% Cr, 9% Ni, 2.5% Mo, 0.25% N, 0.04% C, 0.30% Si, 0.006% S, 0.01% P, with the balance being iron and unavoidable impurities.

8. The high-strength damping alloy welding electrode as described in claim 1, characterized in that, The coating comprises the following components by weight percentage: 30% 98° rutile, 25% fluorite, 6% mica, 6% strontium carbonate, 5% 45# atomized ferrosilicon, 6.5% electrolytic manganese, 0.7% rare earth fluorides, and the balance being iron powder.

9. The high-strength damping alloy welding electrode as described in claim 8, characterized in that, The welding core comprises the following components by weight percentage: 4% Mn, 21% Cr, 9.5% Ni, 3% Mo, 0.3% N, 0.03% C, 0.40% Si, 0.007% S, 0.008% P, with the balance being iron and unavoidable impurities.