CN111318834A - Nickel alloy welding wire for welding cast iron pipe and preparation method thereof - Google Patents
Nickel alloy welding wire for welding cast iron pipe and preparation method thereof Download PDFInfo
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- CN111318834A CN111318834A CN202010221978.6A CN202010221978A CN111318834A CN 111318834 A CN111318834 A CN 111318834A CN 202010221978 A CN202010221978 A CN 202010221978A CN 111318834 A CN111318834 A CN 111318834A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3033—Ni as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/06—Cast-iron alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of welding materials, in particular to a nickel alloy welding wire for welding a cast iron pipe and a preparation method thereof. In order to further improve the mechanical property and the welding property of the nickel alloy welding wire for welding the cast iron pipe, the invention provides the nickel alloy welding wire for welding the cast iron pipe and a preparation method thereof, wherein the nickel alloy welding wire mainly comprises the following components: ni, C, Al, Zr, Fe and other main elements. The nickel alloy welding wire prepared by the invention has excellent high-temperature mechanical property of deposited metal, stable welding arc, no splashing, attractive weld formation, high-temperature tensile strength of 700MPa and high-temperature cracking resistance time of 190 h. The method adopts mechanical husking to remove the oxide skin on the surface of the welding wire, is green and environment-friendly in production process, does not have acid pickling pollution, and has good application prospect.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a nickel alloy welding wire for welding a cast iron pipe and a preparation method thereof.
Background
The welding wire is a metal wire which is melted and filled at the joint of welding workpieces during gas welding or electric welding, the material of the welding wire is usually the same as that of the workpieces, and when the welding wire is used for welding, the metal of a core wire accounts for a part of the metal of the whole welding seam, so the chemical composition of the core wire directly influences the quality of the welding seam.
As a special welding material, the cast iron welding wire is indispensable in the engineering fields of casting welding, defect repair and the like. Because of high content of impurities such as sulfur, phosphorus and the like, low strength and poor plasticity, the inherent solidification characteristic of the cast iron determines that white spots or cracks are easy to generate in a weld repair area in the welding repair process of the cast iron, and particularly under the condition of cold sweat, the white spots and the cracks have higher tendency and seriously affect the machining performance of castings. The addition of manganese, silicon and other elements in the welding wire can eliminate P, S impurity to some extent from causing white spots or cracks in the welding wire repair area, but the welding performance of the welding wire is still to be improved. For example, Chinese patent CN101185994A discloses a solid normal temperature cast iron welding wire and a preparation method thereof, and further discloses that the chemical components of the welding wire contain 0.36-0.43% of Mn and 0.01-0.03% of Si, and the contents of elements such as Mn, Si and the like in the welding wire components are higher, which improves the performance of the product compared with the prior art, but still can not meet the requirements of the welding performance of cast iron, and has a larger difference with the performance of the product.
In addition, surface scale is usually removed in the existing nickel alloy welding wire manufacturing process by adopting an acid washing mode, but a large amount of waste gas, waste liquid and solid waste are generated, the surrounding environment is seriously polluted, and meanwhile, the surface smoothness of the welding wire is poor, so that the wire feeding and arc stability in the welding process are influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the technical problems to be solved by the invention are as follows: how to remove the oxide skin on the surface of the welding wire by mechanical shelling and further improve the mechanical property and the welding property of the nickel alloy welding wire for welding the cast iron pipe.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a nickel alloy welding wire for welding a cast iron pipe, which comprises the following components in percentage by weight: 50-60% of Ni, 0.03-0.15% of C, 0.3-0.6% of Mn, 0.1-0.3% of Si, 0.1-0.3% of Al, 0.01-0.05% of Zr, less than or equal to 0.01% of S, less than or equal to 0.01% of P, and the balance of Fe and inevitable impurities.
Specifically, the addition amount of the Al is 3-4% of the Ni.
Specifically, the weight ratio of C to Zr is 3: 1.
Specifically, the welding wire adopts the following raw materials: metallic nickel, photoelectric carbon, monocrystalline silicon, electrolytic manganese, metallic aluminum, zirconium-silicon alloy and atomized iron powder.
A preparation method of a nickel alloy welding wire for welding a cast iron pipe comprises the following steps:
(1) alloy smelting, namely putting the raw materials into a vacuum induction furnace according to the proportion for smelting, wherein the vacuum degree needs to reach 6.5 × 10-2Pa above, and casting into electrode bar;
(2) electroslag remelting: adopting electroslag remelting equipment, grinding the surface of the electrode rod in the step (1), inserting the electrode rod serving as an electrode into molten slag for remelting, cutting off power for cooling for 10-15min, removing ingots, and cooling to normal temperature to obtain alloy ingots;
(3) hot forging and cogging: placing the alloy ingot in the step (2) into a heating furnace with the initial temperature less than or equal to 600 ℃ for heating, raising the temperature to 1150-1250 ℃, preserving the heat for 50-60min, forging to form an alloy blank, and cooling to normal temperature;
(4) hot rolling and annealing: heating the alloy blank in the step (3) to 1100-1150 ℃, hot-rolling the alloy blank into a coiled wire material, and cooling the coiled wire material to the normal temperature;
(5) mechanical husking: adopting mechanical husking equipment to perform mechanical husking treatment on the surface of the wire rod in the step (4) to remove surface oxide skin to obtain a bright wire rod;
(6) drawing and reducing diameter: gradually drawing and reducing the bright disc round wire material in the step (5) by adopting the existing cold drawing process until the diameter of the wire material is 2.0-2.4mm, so as to ensure that the surface of the wire material is clean and smooth and has no burrs, pits, scratches, sharp bends, knots, oil stains, other impurities and the like;
(7) straightening, cutting or precision layer winding: and (3) straightening and cutting the wire material in the step (6) into a straight strip with the length of 860 and 1000mm by adopting straightening and cutting equipment, or winding the wire material layer in the step (6) on a wire reel by adopting precision layer winding equipment.
Specifically, CaF is adopted as slag in electroslag remelting2-Al2O3CaO slag system, CaF in slag system275-85% by weight of Al2O312-18 percent of CaO and 4-6 percent of CaO.
Specifically, the wire pass tolerance of the welding wire after straightening and cutting is (+0.1mm, -0.1 mm), the wire pass tolerance of the welding wire after precision layer winding is (+0.01mm, -0.04 mm), the relaxation diameter is 600-1000mm, and the warping distance is 0-15 mm.
The invention has the beneficial effects that:
(1) the high-temperature mechanical property of deposited metal of the welding wire prepared by the invention is very excellent, the welding arc is stable, no splashing exists, the welding line is attractive in forming, the high-temperature tensile strength can reach 700MPa, and the high-temperature cracking resistance time can reach 190 h;
(2) the method adopts mechanical husking to remove the oxide skin on the surface of the welding wire, is green and environment-friendly in production process, and does not have acid pickling pollution.
Detailed Description
The present invention will now be described in further detail with reference to examples.
Preparation example of nickel alloy welding wire for welding cast iron pipe:
(1) alloy smelting, namely putting the raw materials into a vacuum induction furnace according to the proportion for smelting, wherein the vacuum degree needs to reach 6.5 × 10-2Pa above, and casting into electrode bar;
(2) electroslag remelting: adopting electroslag remelting equipment, grinding the surface of the electrode rod in the step (1), inserting the electrode rod serving as an electrode into molten slag for remelting, cutting off power for cooling for 10-15min, removing ingots, and cooling to normal temperature to obtain alloy ingots;
(3) hot forging and cogging: placing the alloy ingot in the step (2) into a heating furnace with the initial temperature less than or equal to 600 ℃ for heating, raising the temperature to 1150-1250 ℃, preserving the heat for 50-60min, forging to form an alloy blank, and cooling to normal temperature;
(4) hot rolling and annealing: heating the alloy blank in the step (3) to 1100-1150 ℃, hot-rolling the alloy blank into a coiled wire material, and cooling the coiled wire material to the normal temperature;
(5) mechanical husking: adopting mechanical husking equipment to perform mechanical husking treatment on the surface of the wire rod in the step (4) to remove surface oxide skin to obtain a bright wire rod;
(6) drawing and reducing diameter: gradually drawing and reducing the bright disc round wire material in the step (5) by adopting the existing cold drawing process until the diameter of the wire material is 2.0-2.4mm, so as to ensure that the surface of the wire material is clean and smooth and has no burrs, pits, scratches, sharp bends, knots, oil stains, other impurities and the like;
(7) straightening, cutting or precision layer winding: and (3) straightening and cutting the wire material in the step (6) into a straight strip with the length of 860 and 1000mm by adopting straightening and cutting equipment, or winding the wire material layer in the step (6) on a wire reel by adopting precision layer winding equipment.
Examples 1 to 5 and comparative examples 1 to 4 were each prepared as a nickel alloy welding wire according to the above method, and the elemental compositions of the nickel alloy welding wires of examples 1 to 5 are shown in table 1:
TABLE 1
The nickel alloy welding wires prepared in examples 1 to 5 and comparative examples 1 to 4 were tested for tensile strength, yield strength and elongation at room temperature of the welded and deposited metal test plate according to the GB/T228 metal material room temperature tensile test method; according to the GB/T4338 high-temperature tensile test, the high-temperature endurance performance of the welded joint is tested under the test conditions of 1050 ℃ and 25MPa, and the test results are shown in Table 2:
TABLE 2
The welding wires prepared in examples 1-5 and comparative examples 1-4 were subjected to welding tests, the test results are shown in table 3, and the specific welding process parameters are as follows:
a welding system: fronius 3000MW + ABB robot
Peak current: 80-100A
Base current: 20-40A
Welding speed: 10cm/min
Wire feeding speed: 100cm/min
Protective gas: 99.99% Ar
Gas flow rate: 20L/min.
TABLE 3
The evaluation criteria for the performance tests in table 3 are as follows:
(1) semi-automatic wire feeding, namely calculating the arc extinguishing times of the welding wire per minute, wherein ◎ are recorded for 3 times, ○ are recorded for 3-5 times, △ are recorded for 5-8 times, and × is recorded for 8 times;
(2) the wire feeding performance of the robot is that the arc extinguishing times of the welding wire per minute are calculated, wherein 2 times are recorded as ◎, 2-3 times are recorded as ○, 3-4 times are recorded as △, and more than 4 times are recorded as ×;
(3) and (3) counting the number of pores on the surface of the long weld joint of 1m, wherein 3 are recorded as ◎, 3-4 are recorded as ○, 4-6 are recorded as △, and more than 6 are recorded as ×.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. The nickel alloy welding wire for welding the cast iron pipe is characterized by comprising the following components in percentage by weight: 50-60% of Ni, 0.03-0.15% of C, 0.3-0.6% of Mn, 0.1-0.3% of Si, 0.1-0.3% of Al, 0.01-0.05% of Zr, less than or equal to 0.01% of S, less than or equal to 0.01% of P, and the balance of Fe and inevitable impurities.
2. The nickel alloy welding wire for welding cast iron pipes according to claim 1, characterized in that: the addition amount of the Al is 3-4 per mill of Ni.
3. The nickel alloy welding wire for welding cast iron pipes according to claim 1, characterized in that: the weight ratio of C to Zr is 3: 1.
4. The nickel alloy welding wire for welding cast iron pipes according to claim 1, characterized in that: the welding wire is prepared from the following raw materials: metallic nickel, photoelectric carbon, monocrystalline silicon, electrolytic manganese, metallic aluminum, zirconium-silicon alloy and atomized iron powder.
5. A preparation method of a nickel alloy welding wire for welding cast iron pipes is characterized by comprising the following steps: the preparation method comprises the following steps:
(1) alloy smelting, namely putting the raw materials into a vacuum induction furnace according to the proportion for smelting, wherein the vacuum degree needs to reach 6.5 × 10-2Pa above, and casting into electrode bar;
(2) electroslag remelting: adopting electroslag remelting equipment, grinding the surface of the electrode rod in the step (1), inserting the electrode rod serving as an electrode into molten slag for remelting, cutting off power for cooling for 10-15min, removing ingots, and cooling to normal temperature to obtain alloy ingots;
(3) hot forging and cogging: placing the alloy ingot in the step (2) into a heating furnace with the initial temperature less than or equal to 600 ℃ for heating, raising the temperature to 1150-1250 ℃, preserving the heat for 50-60min, forging to form an alloy blank, and cooling to normal temperature;
(4) hot rolling and annealing: heating the alloy blank in the step (3) to 1100-1150 ℃, hot-rolling the alloy blank into a coiled wire material, and cooling the coiled wire material to the normal temperature;
(5) mechanical husking: adopting mechanical husking equipment to perform mechanical husking treatment on the surface of the wire rod in the step (4) to remove surface oxide skin to obtain a bright wire rod;
(6) drawing and reducing diameter: gradually drawing and reducing the bright disc round wire material in the step (5) by adopting the existing cold drawing process until the diameter of the wire material is 2.0-2.4mm, so as to ensure that the surface of the wire material is clean and smooth and has no burrs, pits, scratches, sharp bends, knots, oil stains, other impurities and the like;
(7) straightening, cutting or precision layer winding: and (3) straightening and cutting the wire material in the step (6) into a straight strip with the length of 860 and 1000mm by adopting straightening and cutting equipment, or winding the wire material layer in the step (6) on a wire reel by adopting precision layer winding equipment.
6. The method for preparing the nickel alloy welding wire for welding the cast iron pipe according to claim 5, wherein the method comprises the following steps: during electroslag remelting, CaF is adopted as slag2-Al2O3CaO slag system, CaF in slag system2The weight percentage of the components is 75-85%,Al2O312-18 percent of CaO and 4-6 percent of CaO.
7. The method for preparing the nickel alloy welding wire for welding the cast iron pipe according to claim 5, wherein the method comprises the following steps: the allowable deviation of the wire of the welding wire after straightening and cutting is (+0.1mm and-0.1 mm), the allowable deviation of the wire of the welding wire after precision layer winding is (+0.01mm and-0.04 mm, the relaxation diameter is 600 and 1000mm, and the warping distance is 0-15 mm.
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| CN202010221978.6A CN111318834A (en) | 2020-03-26 | 2020-03-26 | Nickel alloy welding wire for welding cast iron pipe and preparation method thereof |
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| CN202010221978.6A CN111318834A (en) | 2020-03-26 | 2020-03-26 | Nickel alloy welding wire for welding cast iron pipe and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528322A (en) * | 2012-01-10 | 2012-07-04 | 西安理工大学 | Graphitized alloy casting electric welding rod |
| CN105108377A (en) * | 2015-08-13 | 2015-12-02 | 江苏新航合金科技有限公司 | Nickel alloy welding wire for welding cast iron pipe |
| CN109693055A (en) * | 2019-01-31 | 2019-04-30 | 江苏新航合金科技有限公司 | Oil-gas pipeline inner wall overlaying corrosion-and high-temp-resistant nickel alloy welding wire and preparation method |
| CN109894770A (en) * | 2019-01-31 | 2019-06-18 | 江苏新航合金科技有限公司 | Ethane cracking furnace cast tube NiCrNb-Re corrosion-and high-temp-resistant welding wire and preparation method thereof |
-
2020
- 2020-03-26 CN CN202010221978.6A patent/CN111318834A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528322A (en) * | 2012-01-10 | 2012-07-04 | 西安理工大学 | Graphitized alloy casting electric welding rod |
| CN105108377A (en) * | 2015-08-13 | 2015-12-02 | 江苏新航合金科技有限公司 | Nickel alloy welding wire for welding cast iron pipe |
| CN109693055A (en) * | 2019-01-31 | 2019-04-30 | 江苏新航合金科技有限公司 | Oil-gas pipeline inner wall overlaying corrosion-and high-temp-resistant nickel alloy welding wire and preparation method |
| CN109894770A (en) * | 2019-01-31 | 2019-06-18 | 江苏新航合金科技有限公司 | Ethane cracking furnace cast tube NiCrNb-Re corrosion-and high-temp-resistant welding wire and preparation method thereof |
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