Preparation method of flux-cored wire

Abstract

The invention relates to the technical field of welding materials, in particular to a preparation method of a flux-cored wire, which comprises the following specific steps of: weighing a flux core according to a weight part ratio, putting the flux core into a mixer, and uniformly stirring; the flux core is mixed and wrapped in a steel belt, and diameter reducing, wiredrawing and take-up operation are carried out; the preparation method of the flux core comprises the steps that cobalt powder, yttrium oxide powder, lanthanum hexaboride powder and iron powder are weighed by weight and then put into a pelletizer to be evenly mixed and pelletized, and the inner shell is obtained; the preparation method comprises the following steps: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder and iron powder in parts by weight, putting into a stirrer, and uniformly mixing to obtain a mixed material; and the mixed material and the inner shell are put into a pelletizer to be pelletized, and the flux core is obtained. According to the welding wire preparation method, the manufacturing process route is simple and easy to operate, the production efficiency of the welding wire is high, the surface of the welding wire is clean, and therefore when the welding wire is used, wire feeding is smooth, and splashing is small during welding.

Description

Technical Field

[0001] The invention relates to the technical field of welding materials, in particular to a method for preparing a flux-cored welding wire. Background Art

[0002] Oil drilling technology is evolving toward deeper, ultra-deep wells and longer, extended-reach horizontal wells. The increasing number of deep and ultra-deep wells is creating increasingly demanding conditions for drillstrings downhole. The likelihood of complex downhole problems is also increasing exponentially, placing higher demands on drillstring performance. Developing drilling tools that offer superior drilling safety, deep drilling capability, and high drilling efficiency has become an urgent task.

[0003] Drill pipe joints are key components in the oil drilling process. With the continuous development of modern drilling technology, the requirements for drill pipe joints' impact and wear resistance are constantly increasing. Therefore, improving the wear and impact resistance of drill pipe joints, extending their service life, and improving drilling efficiency are practical engineering issues that need to be urgently addressed.

[0004] To address this problem, domestic and foreign oil drilling tool manufacturers basically use a new type of metal wear-resistant belt, which is a surfacing layer welded with flux-cored welding wire. The wear resistance of the metal wear-resistant belt is related to the performance of the flux-cored welding wire. In order to obtain a metal wear-resistant belt with high crack resistance and high wear resistance, the existing welding wire has low crack resistance and hardness. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a flux-cored welding wire to solve the above problems.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing a flux-cored welding wire, the specific steps are as follows:

[0007] Step 1: weigh the core according to the weight ratio, put it into the mixer and stir evenly;

[0008] Step 2: Wrap the medicine core mixed in step 1 in a steel strip, and perform diameter reduction, wire drawing and wire winding operations.

[0009] As a further embodiment of the present invention, the core comprises the following components in parts by weight: 6-8 parts of carbon powder, 1-3 parts of magnesium powder, 0.2-1.0 parts of manganese powder, 0.1-0.4 parts of cobalt powder, 0.01-0.03 parts of yttrium trioxide powder, 0.01-0.02 parts of lanthanum hexaboride powder, 0.5-1 parts of silicon powder, 0.4-0.8 parts of aluminum-coated nickel powder, and the rest is iron powder.

[0010] As a further embodiment of the present invention, the core comprises an outer shell and an inner shell, the inner shell comprising the following components in parts by weight: 0.1-0.4 parts of cobalt powder, 0.01-0.03 parts of yttrium trioxide powder, 0.01-0.02 parts of lanthanum hexaboride powder, and 20-40 parts of iron powder; the outer shell comprises the following components in parts by weight: 6-8 parts of carbon powder, 1-3 parts of magnesium powder, 0.2-1.0 parts of manganese powder, 0.5-1 parts of silicon powder, 0.4-0.8 parts of aluminum-coated nickel powder, and 50-80 parts of iron powder.

[0011] As a further embodiment of the present invention, the preparation method of the drug core is as follows:

[0012] Step 1: Weigh cobalt powder, yttrium oxide powder, lanthanum hexaboride powder, and iron powder according to weight, put them into a granulator, mix them evenly, and granulate them to obtain an inner shell;

[0013] Step 2: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder, and iron powder according to weight and then putting them into a blender to mix the mixture;

[0014] Step 3: putting the mixed material and the inner shell into a granulator for granulation to obtain the medicine core.

[0015] As a further solution of the present invention, the particle size of the drug core is 60-150 mesh.

[0016] As a further solution of the present invention, the weight of the flux core is 15-20% of the weight of the flux-cored welding wire.

[0017] As a further solution of the present invention, the diameter of the flux-cored welding wire is 1.2-1.4 mm.

[0018] As a further solution of the present invention, the steel strip is a carbon steel strip; the carbon content of the carbon steel strip is 0.05-0.08wt%, the silicon content of the carbon steel strip is less than 0.70wt%, the phosphorus content of the carbon steel strip is less than 0.03wt%, and the manganese content of the carbon steel strip is less than 1.2wt%.

[0019] Since the present invention adopts the above technical solution, the advantages and positive effects of the present invention are:

[0020] 1. The addition of yttrium, lanthanum and other elements to the core of the present invention can more accurately control grain refinement, purify grain boundaries, and improve high-temperature oxidation resistance or corrosion resistance. Elements such as carbon, magnesium, manganese, cobalt, silicon, and aluminum have the characteristics of high crack resistance and high wear resistance.

[0021] 2. The welding wire preparation method adopted by the present invention has a relatively simple manufacturing process route, is easy to operate, has high production efficiency of the welding wire, and has a clean welding wire surface, which makes the wire feeding smooth during use and has little spatter during welding; and the base material does not need to be preheated before welding and can be cooled naturally after welding; the welding process is excellent, the welding fusion is good, the spatter is small, and the post-weld forming is good. DETAILED DESCRIPTION

[0022] Yttrium oxide powder can more accurately control grain refinement, purify grain boundaries, and improve high-temperature oxidation resistance or corrosion resistance, especially in high-temperature alloy or heat-resistant steel welding.

[0023] Lanthanum hexaboride powder can more accurately control grain refinement, purify grain boundaries, and improve high-temperature oxidation resistance or corrosion resistance, especially in high-temperature alloy or heat-resistant steel welding.

[0024] Aluminum-clad nickel powder can produce a more intense and controllable thermite reaction under the action of arc heat, providing additional heat and precise alloying, reducing spatter, and improving penetration and deposition efficiency.

[0025] Example 1

[0026] The present invention provides a method for preparing a flux-cored welding wire, and the specific steps are as follows:

[0027] Step 1: weigh the core according to the weight ratio, put it into the mixer and stir evenly;

[0028] Step 2: Wrap the medicine core mixed in step 1 in a steel strip, and perform diameter reduction, wire drawing and wire winding operations;

[0029] The core comprises the following components in parts by weight: 6 parts carbon powder, 1 part magnesium powder, 0.2 parts manganese powder, 0.1 parts cobalt powder, 0.01 parts yttrium trioxide powder, 0.01 parts lanthanum hexaboride powder, 0.5 parts silicon powder, 0.4 parts aluminum-coated nickel powder, and the rest is iron powder; the core comprises an outer shell and an inner shell, the inner shell comprises the following components in parts by weight: 0.1 parts cobalt powder, 0.01 parts yttrium trioxide powder, 0.01 parts lanthanum hexaboride powder, and 20 parts iron powder; the outer shell comprises the following components in parts by weight : 6 parts of carbon powder, 1 part of magnesium powder, 0.2 parts of manganese powder, 0.5 parts of silicon powder, 0.4 parts of aluminum-coated nickel powder, and 50 parts of iron powder; the weight of the flux core is 15% of the weight of the flux-cored welding wire; the wire diameter of the flux-cored welding wire is 1.2 mm; the steel strip is a carbon steel strip; the carbon content of the carbon steel strip is 0.05-0.08wt%, the silicon content of the carbon steel strip is less than 0.70wt%, the phosphorus content of the carbon steel strip is less than 0.03wt%, and the manganese content of the carbon steel strip is less than 1.2wt%.

[0030] The preparation method of the drug core is:

[0031] Step 1: Weigh cobalt powder, yttrium oxide powder, lanthanum hexaboride powder, and iron powder according to weight, put them into a granulator, mix them evenly, and granulate them to obtain an inner shell;

[0032] Step 2: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder, and iron powder according to weight and then putting them into a blender to mix the mixture;

[0033] Step 3: putting the mixed material and the inner shell into a granulator to granulate to obtain the drug core;

[0034] Among them, the particle size of the drug core is 60 mesh.

[0035] Example 2

[0036] The present invention provides a method for preparing a flux-cored welding wire, and the specific steps are as follows:

[0037] Step 1: weigh the core according to the weight ratio, put it into the mixer and stir evenly;

[0038] Step 2: Wrap the medicine core mixed in step 1 in a steel strip, and perform diameter reduction, wire drawing and wire winding operations;

[0039] The core comprises the following components in parts by weight: 6.5 parts of carbon powder, 1.8 parts of magnesium powder, 0.4 parts of manganese powder, 0.2 parts of cobalt powder, 0.016 parts of yttrium trioxide powder, 0.013 parts of lanthanum hexaboride powder, 0.6 parts of silicon powder, 0.5 parts of aluminum-coated nickel powder, and the rest is iron powder; the core comprises an outer shell and an inner shell, the inner shell comprises the following components in parts by weight: 0.2 parts of cobalt powder, 0.016 parts of yttrium trioxide powder, 0.013 parts of lanthanum hexaboride powder, and 28 parts of iron powder; the outer shell comprises the following components in parts by weight The welding wire comprises: 6.5 parts of carbon powder, 1.8 parts of magnesium powder, 0.4 parts of manganese powder, 0.6 parts of silicon powder, 0.5 parts of aluminum-coated nickel powder, and 60 parts of iron powder; the weight of the flux core is 16% of the weight of the flux-cored welding wire; the wire diameter of the flux-cored welding wire is 1.2 mm; the steel strip is a carbon steel strip; the carbon content of the carbon steel strip is 0.05-0.08 wt%, the silicon content of the carbon steel strip is less than 0.70 wt%, the phosphorus content of the carbon steel strip is less than 0.03 wt%, and the manganese content of the carbon steel strip is less than 1.2 wt%.

[0040] The preparation method of the drug core is:

[0041] Step 1: Weigh cobalt powder, yttrium oxide powder, lanthanum hexaboride powder, and iron powder according to weight, put them into a granulator, mix them evenly, and granulate them to obtain an inner shell;

[0042] Step 2: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder, and iron powder according to weight and then putting them into a blender to mix the mixture;

[0043] Step 3: Put the mixed material and the inner shell into a granulator to granulate to obtain a medicine core; the particle size of the medicine core is 80 mesh.

[0044] Example 3

[0045] The present invention provides a method for preparing a flux-cored welding wire, and the specific steps are as follows:

[0046] Step 1: weigh the core according to the weight ratio, put it into the mixer and stir evenly;

[0047] Step 2: Wrap the medicine core mixed in step 1 in a steel strip, and perform diameter reduction, wire drawing and wire winding operations;

[0048] The core comprises the following components in parts by weight: 7.3 parts of carbon powder, 2.5 parts of magnesium powder, 0.7 parts of manganese powder, 0.3 parts of cobalt powder, 0.024 parts of yttrium trioxide powder, 0.017 parts of lanthanum hexaboride powder, 0.8 parts of silicon powder, 0.7 parts of aluminum-coated nickel powder, and the rest is iron powder; the core comprises an outer shell and an inner shell, the inner shell comprises the following components in parts by weight: 0.3 parts of cobalt powder, 0.024 parts of yttrium trioxide powder, 0.017 parts of lanthanum hexaboride powder, and 35 parts of iron powder; the outer shell comprises the following components in parts by weight The welding wire comprises: 7.3 parts of carbon powder, 2.5 parts of magnesium powder, 0.7 parts of manganese powder, 0.8 parts of silicon powder, 0.7 parts of aluminum-coated nickel powder, and 70 parts of iron powder; the weight of the flux core is 8% of the weight of the flux-cored welding wire; the wire diameter of the flux-cored welding wire is 1.3 mm; the steel strip is a carbon steel strip; the carbon content of the carbon steel strip is 0.05-0.08 wt%, the silicon content of the carbon steel strip is less than 0.70 wt%, the phosphorus content of the carbon steel strip is less than 0.03 wt%, and the manganese content of the carbon steel strip is less than 1.2 wt%.

[0049] The preparation method of the drug core is:

[0050] Step 1: Weigh cobalt powder, yttrium oxide powder, lanthanum hexaboride powder, and iron powder according to weight, put them into a granulator, mix them evenly, and granulate them to obtain an inner shell;

[0051] Step 2: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder, and iron powder according to weight and then putting them into a blender to mix the mixture;

[0052] Step 3: Put the mixed material and the inner shell into a granulator for granulation to obtain a medicine core; the particle size of the medicine core is 120 mesh.

[0053] Example 4

[0054] The present invention provides a method for preparing a flux-cored welding wire, and the specific steps are as follows:

[0055] Step 1: weigh the core according to the weight ratio, put it into the mixer and stir evenly;

[0056] Step 2: Wrap the medicine core mixed in step 1 in a steel strip, and perform diameter reduction, wire drawing and wire winding operations;

[0057] The core comprises the following components in parts by weight: 8 parts of carbon powder, 3 parts of magnesium powder, 1.0 parts of manganese powder, 0.4 parts of cobalt powder, 0.03 parts of yttrium trioxide powder, 0.02 parts of lanthanum hexaboride powder, 1 part of silicon powder, 0.8 parts of aluminum-coated nickel powder, and the rest is iron powder; the core comprises an outer shell and an inner shell, the inner shell comprises the following components in parts by weight: 0.4 parts of cobalt powder, 0.03 parts of yttrium trioxide powder, 0.02 parts of lanthanum hexaboride powder, and 40 parts of iron powder; the outer shell comprises the following components in parts by weight : 8 parts of carbon powder, 3 parts of magnesium powder, 1.0 part of manganese powder, 1 part of silicon powder, 0.8 part of aluminum-coated nickel powder, and 80 parts of iron powder; the weight of the flux core is 20% of the weight of the flux-cored welding wire; the wire diameter of the flux-cored welding wire is 1.4 mm; the steel strip is a carbon steel strip; the carbon content of the carbon steel strip is 0.05-0.08wt%, the silicon content of the carbon steel strip is less than 0.70wt%, the phosphorus content of the carbon steel strip is less than 0.03wt%, and the manganese content of the carbon steel strip is less than 1.2wt%.

[0058] The preparation method of the drug core is:

[0059] Step 1: Weigh cobalt powder, yttrium oxide powder, lanthanum hexaboride powder, and iron powder according to weight, put them into a granulator, mix them evenly, and granulate them to obtain an inner shell;

[0060] Step 2: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder, and iron powder according to weight and then putting them into a blender to mix the mixture;

[0061] Step 3: Put the mixed material and the inner shell into a granulator for granulation to obtain a medicine core; the particle size of the medicine core is 150 mesh.

[0062] Table 1 is the performance test of Examples 1-4

[0063]

[0064] As can be seen from Table 1, the metal wear-resistant belt of the present invention has high crack resistance and high wear resistance; the welding wire preparation method adopted by the present invention has a relatively simple manufacturing process route, is easy to operate, has high production efficiency of the welding wire, and has a clean surface of the welding wire, which makes the wire feeding smooth when used and has little spatter during welding; and the base material does not need to be preheated before welding and can be cooled naturally after welding; the welding process is excellent, the welding fusion is good, the spatter is small, and the post-weld forming is good.

[0065] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A method for preparing a flux-cored welding wire, characterized by: Specific steps as follows: Step 1: weigh the core according to the weight ratio, put it into the mixer and stir evenly; Step 2: Wrap the medicine core mixed in step 1 in a steel strip, and perform diameter reduction, wire drawing and wire winding operations.

2. The method for preparing a flux-cored welding wire according to claim 1, wherein: The core comprises the following components in parts by weight: 6-8 parts of carbon powder, 1-3 parts of magnesium powder, 0.2-1.0 parts of manganese powder, 0.1-0.4 parts of cobalt powder, 0.01-0.03 parts of yttrium trioxide powder, 0.01-0.02 parts of lanthanum hexaboride powder, 0.5-1 parts of silicon powder, 0.4-0.8 parts of aluminum-coated nickel powder, and the rest is iron powder.

3. The method for preparing a flux-cored welding wire according to claim 2, wherein: The core comprises an outer shell and an inner shell, wherein the inner shell comprises the following components in parts by weight: 0.1-0.4 parts of cobalt powder, 0.01-0.03 parts of yttrium trioxide powder, 0.01-0.02 parts of lanthanum hexaboride powder, and 20-40 parts of iron powder; the outer shell comprises the following components in parts by weight: 6-8 parts of carbon powder, 1-3 parts of magnesium powder, 0.2-1.0 parts of manganese powder, 0.5-1 parts of silicon powder, 0.4-0.8 parts of aluminum-coated nickel powder, and 50-80 parts of iron powder.

4. The method for preparing a flux-cored welding wire according to claim 3, wherein: The preparation method of the drug core is: Step 1: Weigh cobalt powder, yttrium oxide powder, lanthanum hexaboride powder, and iron powder according to weight, put them into a granulator, mix them evenly, and granulate them to obtain an inner shell; Step 2: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder, and iron powder according to weight and then putting them into a blender to mix the mixture; Step 3: putting the mixed material and the inner shell into a granulator for granulation to obtain the medicine core.

5. The method for preparing a flux-cored welding wire according to claim 1, wherein: The particle size of the drug core is 60-150 meshes.

6. The method for preparing a flux-cored welding wire according to claim 1, wherein: The weight of the flux core is 15-20% of the weight of the flux cored welding wire.

7. The method for preparing a flux-cored welding wire according to claim 1, wherein: The diameter of the flux-cored welding wire is 1.2-1.4 mm.

8. The method for preparing a flux-cored welding wire according to claim 1, wherein: The steel strip is a carbon steel strip; the carbon content of the carbon steel strip is 0.05-0.08wt%, the silicon content of the carbon steel strip is less than 0.70wt%, the phosphorus content of the carbon steel strip is less than 0.03wt%, and the manganese content of the carbon steel strip is less than 1.2wt%.

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