KR102197601B1 - Carbide spacer comprising tungsten carbide and nickel-based metal and manufacturing thereof - Google Patents

Abstract

The present invention relates to a metal powder for manufacturing a carbide spacer and a method for manufacturing a carbide spacer, comprising a metal powder including tungsten carbide powder and a nickel-based metal powder, and manufactured by using Plasma Transferred Arc (PTA) growth welding. . The present invention provides a metal powder for manufacturing a carbide spacer comprising 50 to 65 parts by weight of tungsten carbide powder, 5 to 10 parts by weight of cobalt powder, and 25 to 40 parts by weight of a nickel-based self-soluble powder.

Description

TECHNICAL FIELD [0001] A method for manufacturing a carbide spacer and a metal powder for manufacturing a carbide spacer containing tungsten carbide and a nickel-based metal TECHNICAL FIELD

The present invention relates to a metal powder for manufacturing a carbide spacer and a method for manufacturing a carbide spacer containing tungsten carbide and a nickel-based metal, and more particularly, to a metal powder containing tungsten carbide powder, and a plasma transferred arc (Plasma Transferred Arc: PTA) It relates to a method of manufacturing a carbide spacer and a metal powder for manufacturing a carbide spacer manufactured using growth welding.

An excavator is a type of heavy equipment used in construction and civil engineering sites, and is widely used for crushing strong ground such as rocks, or for digging the ground to spread work objects such as soil.

The excavator includes an excavator body provided with a transfer unit and a cab, an arm unit coupled to the excavator body and rotating, and a gourd-shaped bucket provided at the end of the arm unit to scoop a work object such as soil. The bucket is detachably coupled to the end of the arm unit.

At this time, when connecting a bucket (not shown) to the female unit 1, the spacer 5 having a plurality of holes 6 formed therein should be bolted to the coupling hole 2 of the female unit 1 (7). For this, a bolt hole must be formed in each of the arm unit 1 and the spacer 5.

Due to the nature of the excavator used in a place where foreign substances are introduced, foreign substances penetrate between the arm unit (1), spacer (5) and the bucket, resulting in abnormal wear, which may cause clearance. The sliding part may be worn and the bucket may operate abnormally. In order to solve this problem, according to the existing technology (Korean Patent No. 10-0956998), the spacer 5 is made of a cemented carbide material by directly forming a cemented carbide build-up welding film on the carbon steel body to form a cemented carbide layer on the iron base material. It is proposed to manufacture a spacer by a powder sintering process that does not require a process such as casting or sintering to separately manufacture a wear-resistant part, and does not require a silver soldering process that requires skill.

However, such a known technique has limitations such as non-uniformity of powder distribution during the powder powdering process and relying on manual labor during manufacture. Therefore, the present invention intends to present a carbide spacer by the PTA (Plasma Transfered Arc) process that is simpler than the existing technology and can be automated, and the manufacturing process is simple and has excellent wear resistance and uniform abrasion characteristics by the cemented carbide build-up welding film. .

Korean Patent Registration No. 10-0956998

In order to solve the above-described problem, the present invention is a method of manufacturing a carbide spacer and a method of manufacturing a carbide spacer having a simple process of forming a wear-resistant portion in the sliding portion of the carbide spacer, easy to combine the carbide spacer, and has excellent wear resistance. Is to provide.

In order to solve the above problem, the present invention according to the first aspect is a metal powder for manufacturing a carbide spacer comprising 50 to 65 parts by weight of tungsten carbide powder, 5 to 10 parts by weight of cobalt powder, and 25 to 40 parts by weight of a nickel-based self-soluble powder. Provides.

The nickel-based self-soluble powder includes (a) 0.5 to 1 part by weight of boron; (b) 2 to 4 parts by weight of carbon; (c) 3 to 5 parts by weight of chromium; (d) 0.5 to 1 part by weight of iron; (e) 20 to 25 parts by weight of nickel; And (f) 0.5 to 2 parts by weight of silicon (Silicon) may be included.

The metal powder may have a powder particle size (FSSS) of 45 to 150 μm, a flow rate (50 g) of 11.5 to 12.5 sec, and an apparent density of 5.8 to 6.3 g/cm 3.

The present invention according to the second aspect provides a carbide spacer including a carbide portion manufactured using the metal powder.

The carbide part is tungsten carbide 20 to 30 parts by weight, cobalt 4 to 6 parts by weight, boron 0.1 to 1 parts by weight, carbon 5 to 15 parts by weight, chromium 2 to 3 parts by weight, iron 40 to 50 parts by weight, nickel 8 to 15 It may include parts by weight and 2 to 4 parts by weight of silicon.

The carbide spacer may be for an excavator bucket.

The carbide spacer connects the bucket to a hole formed in the excavator arm in order to couple the bucket to the excavator arm, and has a disk shape in which a hole for connecting the excavator arm and the bucket is formed in the center, and the exposed surface of the spacer has the 2 to 10 fixing units to be closely fixed to the excavator arm may be provided at regular intervals.

The exposed surface of the spacer may form a cemented carbide portion through a plasma transferred arc (PTA) growth welding process between the fixed portions using the metal powder.

The present invention according to a third aspect is a method of manufacturing a carbide spacer fixed to one side of an excavator arm and sliding with a bucket, comprising the steps of: (i) manufacturing an integrated ring shape of carbon steel; (ii) forming a fixing part for fixing to the excavator arm on one surface of the ring shape; (iii) forming a carbide portion through plasma transfer arc (PTA) growth welding between the fixed portions formed on one surface of the ring shape, wherein the carbide portion uses the metal powder as a thermal spraying material. It provides a method of manufacturing a carbide spacer, characterized in that proceeds by plasma transfer arc growth welding.

The carbide portion may be formed by repeatedly performing a plasma transfered arc (PTA) growth welding process one or more times to form a desired film thickness.

The cemented carbide part may form a uniform thickness by mechanically polishing the build-up welding film after the plasma transfered arc (PTA) build-up welding process.

The plasma transferred arc (PTA) growth welding may be performed under a working current of 110 ~ 140A.

According to an embodiment of the present invention,

As the cemented carbide build-up welding film is formed directly on the carbon steel body, there is no need for processes such as casting and sintering to separately manufacture the wear-resistant part of the cemented carbide material, and there is no need for a silver soldering process that requires skill, resulting in quality unevenness that can occur during the bonding process. Not only is this eliminated, it is more advantageous for automation.

Carbide spacer according to an embodiment of the present invention has a simple manufacturing process, excellent abrasion resistance and uniform abrasion characteristics by the cemented carbide growth welding film.

1 is an exploded perspective view showing a carbide spacer connected to an excavator arm according to an embodiment of the present invention.
Figure 2 schematically shows the structure of the torch portion of the plasma transfer arc welding machine used in an embodiment of the present invention.
3 shows an enlarged view of tungsten carbide (WC) powder, cobalt (Co)-based non-soluble powder, and a metal powder obtained by mixing them used in an embodiment of the present invention.
Figure 4 shows the wear test results according to an embodiment of the present invention.
Figure 5 shows the Rockwell hardness test results according to an embodiment of the present invention.
6 is a photograph of a carbide spacer after plasma transition arc buildup welding according to an embodiment of the present invention. (a) is after the PTA work is completed, (b) is after plane polishing, and (c) is after surface treatment. will be.
7 is an enlarged photograph of a change in cemented carbide particles different from the current supply amount according to an embodiment of the present invention.
8 is a picture of the cemented carbide spacer according to an embodiment of the present invention and a picture of the cemented carbide part-base material interfacial structure, (a) is a photograph of the shape and base structure in which tungsten carbide and cobalt particles are preserved, and (b) is a PTA method. A photo of the cemented carbide-base material interface formed by, ① is an enlarged SEM photo of tungsten carbide and cobalt particles in (a), ② is a photo of the base structure in (a), and ③ is an enlarged SEM photo of the interface in (b) Each is shown.
9 is a photograph of an actual application of a carbide spacer according to an embodiment of the present invention to an excavator arm.

Hereinafter, a preferred embodiment of the present invention will be described in detail. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted. Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components, unless otherwise stated.

The present invention is intended to illustrate specific embodiments and to be described in detail in the detailed description, since various transformations can be applied and various embodiments can be provided. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all conversions, equivalents, or substitutes included in the spirit and scope of the present invention.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present invention, terms such as include or have are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination of them described in the specification, and one or more other features, numbers, and steps. It is to be understood that it does not preclude the possibility of the presence or addition of, operations, components, parts or combinations thereof.

The present invention relates to a metal powder for manufacturing a carbide spacer comprising 50 to 65 parts by weight of tungsten carbide powder, 5 to 10 parts by weight of cobalt powder, and 25 to 40 parts by weight of a nickel-based self-soluble powder.

Tungsten carbide has a very high strength and is used in the manufacture of machine tools, armored shells for tanks, and ballpoint pen nibs. However, tungsten carbide has a high brittleness and a very high melting point, so it is almost impossible to manufacture it in a certain shape through a process such as casting or forging directly. Therefore, cobalt or nickel is used by sintering as a substrate. The tungsten carbide used in the present invention has a purity of 99% by weight or more, and has a powder particle size (FSSS) of 45 to 150 µm, a flow rate (50 g) of 9 to 10 sec, and an apparent density of 7.3 to 7.4 g/cm 3 It is preferable to use. When the purity of tungsten carbide is less than 99% by weight, the desired strength does not appear, and even when tungsten carbide outside of the above properties is used, the strength of the manufactured carbide spacer may decrease.

The metal powder for manufacturing the carbide spacer may additionally include 25 to 40 parts by weight of the nickel-based self-soluble powder, and the nickel-based self-soluble powder may include (a) 0.5 to 1 parts by weight of boron; (b) 2 to 4 parts by weight of carbon; (c) 3 to 5 parts by weight of chromium; (d) 0.5 to 1 part by weight of iron; (e) 20 to 25 parts by weight of nickel; And (f) 0.5 to 2 parts by weight of silicon (Silicon) may be included.

If the amount of nickel is less than 20 parts by weight, it cannot function as a binder, and there are problems such as a decrease in strength due to the large number of pores in the tissue.If the amount of nickel is more than 25 parts by weight, on the contrary, since the binder is more than tungsten carbide, the hardness decreases. Occurs. Chromium is added as a role of improving hardness and increasing corrosion resistance, and does not perform its role outside the above range. Boron gives the effect of improving the wettability so that it is easy to wrap the tungsten carbide by melting the self-soluble powder.If it is less than 0.5 parts by weight, the effect of improving the wettability is greatly low, and if it is more than 1 part by weight, the fracture resistance decreases and the strength is greatly reduced. . Silicon forms a solid solution with nickel to lower the melting point, and when it is less than 0.5 parts by weight, there is no effect of lowering the melting point or is small, and when it is more than 2 parts by weight, the strength of the cemented carbide layer is greatly reduced.

The cobalt powder and the nickel-based non-soluble powder are melted to form a matrix, and may include tungsten carbide powder therein. At this time, it is preferable to use the cobalt powder and the nickel-based non-soluble powder having physical properties having a powder particle size (FSSS) of 45 to 150 μm, a flow rate (50 g) of 15 to 16 sec, and an apparent density of 4.3 to 4.4 g/cm 3. When using cobalt powder and nickel-based non-soluble powder outside of the above properties, the strength of the carbide spacer may be degraded because the matrix is not formed properly or tungsten carbide is not dispersed smoothly on the matrix.

In addition, the metal powder may have a powder particle size (FSSS) of 45 to 150 μm, a fluidity (50 g) of 11.5 to 12.5 sec, and an apparent density of 5.8 to 6.3 g/cm 3. Since the metal powder is composed of a mixture of the tungsten carbide powder, cobalt powder, and nickel-based non-soluble powder, it is preferable to have the above physical properties.

The present invention according to the second aspect relates to a carbide spacer comprising a carbide produced using a metal powder.

The carbide spacer may be a carbide spacer for an excavator bucket.

The carbide spacer may be manufactured using a metal powder composed of tungsten carbide, cobalt, and nickel-based non-soluble powder, wherein the metal powder is 50 to 65 parts by weight of tungsten carbide powder, 5 to 10 parts by weight of cobalt powder, and nickel-based It may contain 25 to 40 parts by weight of self-soluble powder. In addition, when manufactured using a metal powder composed of tungsten carbide and cobalt as described above, the carbide spacer includes 20 to 30 parts by weight of tungsten carbide, 4 to 6 parts by weight of cobalt, 0.1 to 1 part by weight of boron, and 5 to 15 parts by weight of carbon. Parts, 2 to 3 parts by weight of chromium, 40 to 50 parts by weight of iron, 8 to 15 parts by weight of nickel, and 2 to 4 parts by weight of silicon.

The carbide spacer 5 connects the bucket to the hole part 4 formed in the excavator arm to couple the bucket to the excavator arm 1, and a hole for connecting the excavator arm 1 and the bucket is formed in the center. It has a disk shape and may be provided with 2 to 10 fixing parts 6 at regular intervals to be closely fixed to the excavator arm 1 on the exposed surface of the spacer.

1 is an exploded perspective view of a carbide spacer and an excavator arm according to an embodiment of the present invention.

Carbide spacer 5 according to an embodiment of the present invention is in the form of a ring made integrally of carbon steel, and can be manufactured through a casting process and additional machining. Abrasion resistance is imparted to the sliding portion of the carbon steel carbide spacer 5, which requires a high level of hardness and abrasion resistance, by forming a plasma transfer arc build-up welding film using metal powder having excellent durability as a filler material.

Referring to FIG. 1, the carbide spacer according to the embodiment of the present invention may be manufactured in a disk shape, and a hole for connecting the excavator arm 1 and the bucket may be provided in the center. In addition, two carbide spacers 5 may be provided on both sides of the excavator arm 1, and the excavator arm 1 and the bucket may be fixed with pins (see FIG. 13 ). In addition, the carbide spacer 5 may be composed of a non-exposed surface, which is a part in contact with the excavator arm, and an exposed surface, which is a part in contact with the bucket, and 2 to 10, preferably, to be closely fixed to the excavator arm on the exposed surface. For example, 4 to 8, more preferably 6 fixing parts 6 may be provided at regular intervals. If there are less than two fixing parts, the cemented carbide spacer 5 may not be smoothly fixed and may be separated during operation. If more than 10 are provided, the area of the carbide parts formed between the fixing parts 6 is reduced. The strength of the carbide spacer may decrease.

The exposed surface of the spacer may form a cemented carbide portion through a plasma transferred arc (PTA) growth welding process between the fixed portions using the metal powder.

During the plasma transfer arc build-up welding process, the carbide powder, which is a filler material, is transferred to a plasma torch in an inert gas atmosphere and is melted while being ejected by an arc directly, forming a melt bond on the surface of the base material (see FIG. 2). Plasma transfer arc buildup welding has advantages such as easy synthesis of cemented carbide powder, formation of a relatively thick buildup welding film, low cost, high heat input, high welding efficiency, and easy workability.

At this time, when forming the welding film by plasma transfer arc build-up welding, in order to achieve smoothness of the welding film surface and prevent cracking at the welding interface, the welding film is applied to the target surface of the base material by one welding transfer process. It is preferably formed. However, when two or more types of build-up welding films are stacked and used, or if a thick build-up welding film with a thick film is required, the plasma transfer arc build-up welding may be repeated two or more times.

The minimum thickness of the formed welding film is preferably 0.5 mm or more in order to obtain a sufficient wear resistance life. The maximum thickness of the welding film is preferably limited to the thickness that can be achieved by one plasma transfer arc welding. Considering the durability of the welding film and the ease of the welding process, the maximum thickness of the welding film is limited to 6 mm. It is desirable to do.

Meanwhile, the carbide powder (metal powder) used at this time may include 50 to 65 parts by weight of tungsten carbide powder, 5 to 10 parts by weight of cobalt powder, and 25 to 40 parts by weight of the nickel-based self-soluble powder, as described above.

After forming the welding film as described above, an additional grinding process may be performed for smoothing and dimensional accuracy of the sliding surface (FIG. 6).

The present invention according to a third aspect is a method of manufacturing a carbide spacer fixed to one side of an excavator arm and sliding with a bucket, comprising the steps of: (i) manufacturing an integrated ring shape of carbon steel; (ii) forming a fixing part for fixing to the excavator arm on one surface of the ring shape; (iii) forming a carbide portion through plasma transfer arc (PTA) growth welding between the fixed portions formed on one surface of the ring shape, wherein the carbide portion uses the metal powder as a thermal spraying material. It relates to a method of manufacturing a carbide spacer, characterized in that proceeds by plasma transfer arc growth welding.

The carbide portion may be formed by repeatedly performing a plasma transfered arc (PTA) growth welding process one or more times to form a desired film thickness.

The cemented carbide part may be mechanically polished to form a smooth surface and a uniform thickness after a plasma transferred arc (PTA) growth welding process.

The plasma transferred arc (PTA) growth welding may be performed under a working current of 110 ~ 140A. The amount of current supplied in the plasma shift arc welding is a major factor determining the amount of plasma generated and the temperature of the welding. In the present invention, when the working current is less than 110A, the melting of the cobalt powder and the nickel-based non-soluble powder is not smooth, so that the tungsten carbide and the cobalt powder and the nickel-based non-soluble powder are separated, and when a current exceeding 140A is supplied, tungsten carbide The particles may melt or re-precipitate, resulting in lower strength.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or a known configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, certain features presented in the drawings are enlarged or reduced or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

Example 1

Tungsten carbide having a purity of 99% by weight, 58.9% by weight of tungsten carbide with a purity of 99% by weight, 8.4% by weight of cobalt and 0.8% by weight of boron, 2.9% by weight of carbon, 4.2% by weight of chromium, 0.8% by weight of iron, 22.9% by weight of nickel, A metal powder was prepared by mixing 32.7% by weight of a nickel-based non-soluble powder composed of 1.1% by weight of silicon.

The metal powder was applied to a cemented carbide spacer base using a plasma transfer arc growing method to form a build-up welding film with a thickness of 5 mm on the sliding surface of the sliding portion. At this time, the working current was performed at 120A. After forming the build-up welding film, a carbide spacer was fabricated through plane polishing.

Example 2

Except for using the working current of 140A in Example 1, the same was carried out.

Example 3

The experiment was carried out in the same manner as in Example 1 except that 60% by weight of tungsten carbide and 40% by weight of nickel-based self-soluble powder were used, and a working current was used at 110A.

Example 4

The same was carried out except that the working current was used at 140A in Example 3.

Comparative Example 1

It was carried out in the same manner as in Example 1 except that the working current was used at 100A.

Comparative Example 2

It was carried out in the same manner as in Example 1 except that the working current was used as 160A.

Comparative Example 3

It was carried out in the same manner as in Example 1 except that the working current was used at 180A.

Experimental Example 1

Abrasion resistance test was conducted by the method shown in ASTM G65-B using the carbide spacers prepared in Examples 1 to 4 above.

Before experiment (g) After experiment (g) Deviation Abrasion amount (㎣) Example 1 212.0873 212.0454 0.0419 4.48 Example 2 217.0936 217.0191 0.0745 7.96 Example 3 212.8780 212.6289 0.2491 25.87 Example 4 212.8011 212.4261 0.3750 38.94

As shown in Table 1 and 4, tungsten carbide 58.9% by weight, cobalt 8.4% by weight, boron 0.8% by weight, carbon 2.9% by weight, chromium 4.2% by weight, iron 0.8% by weight, nickel 22.9% by weight, silicon 1.1% by weight It was found that the durability of the carbide spacer using the plasma transition arc growth method was the highest by using the mixed metal powder and supplying a current of 120A.

Experimental Example 2

Rockwell hardness was specified using the carbide spacers prepared in Examples 1 to 4. The rockwell hardness was specified using DTR-200N of Daekyung Tech Co., Ltd., and measured by calculating the average value of 5 times excluding the minimum and maximum values after each 7 measurements using a specimen with surface processing completed.

One 2 3 4 5 Average Example 1 83.7 84.4 83.7 83.5 846 84.18 Example 2 81.8 82.6 81.7 81.1 83.1 82.03 Example 3 83.0 82.8 83.0 82.1 83.4 82.86 Example 4 79.2 79.7 79.6 80.1 79.2 79.56

As shown in Table 2 and 5, tungsten carbide 58.9% by weight, cobalt 8.4% by weight, boron 0.8% by weight, carbon 2.9% by weight, chromium 4.2% by weight, iron 0.8% by weight, nickel 22.9% by weight, silicon 1.1% by weight It was found that the hardness of the carbide spacer using the plasma transition arc growth method was the highest by supplying a current of 120A.

Experimental Example 3

The cross-sectional structure was measured using the carbide spacers prepared in Example 1 and Comparative Examples 1 to 3. As shown in FIG. 11, in the case of Comparative Example 1 in which a current was supplied at 100A, a phenomenon in which tungsten carbide was separated from the matrix portion produced by cobalt powder and nickel-based non-soluble powder was observed, and when a current was supplied over 160A It was confirmed that chemical changes such as melting or re-precipitation of tungsten carbide occurred due to a high amount of heat.

Experimental Example 4

The composition ratio of the carbide portions of the carbide spacers prepared in Examples 1 and 3 were always investigated. The measured composition ratio is shown in Table 3.

element Example 1 (% by weight) tungsten 23.0 cobalt 4.8 boron 0.3 carbon 9.2 chrome 2.4 iron 46.2 nickel 11.3 silicon 2.8 Sum 100

As shown in Table 3, it was confirmed that the content of carbon and iron was increased in the composition ratio of the carbide portion compared to the composition ratio of the metal powder. This resulted in a higher iron content as a result of bonding with iron as the base by the plasma transfer arc growth method. Through this, it can be confirmed that the metal powder according to the present invention is strongly combined with the base by the plasma transfer arc growth method. In addition, as shown in FIG. 12, when an appropriate plasma transfer arc-growth welding method is used (b, ②, and ③ in FIG. 8), tungsten carbide, cobalt, and nickel-based self-soluble particles are evenly distributed in the molten base layer at the interface with iron. It can be seen that the tungsten carbide is distributed and has high hardness and wear resistance due to the suppressed grain growth.

As described above, specific parts of the present invention have been described in detail, and it will be apparent to those of ordinary skill in the art that these specific techniques are only preferred embodiments, and the scope of the present invention is not limited thereby. will be. Accordingly, it will be said that the substantial scope of the present invention is defined by the appended claims and their equivalents.

1: excavator arm 2: fixed part in the excavator arm
3: pin insertion part 4: hole part
5: carbide spacer 6: fixing part

Claims (12)

50 to 65% by weight of tungsten carbide powder, 5 to 10% by weight of cobalt powder, and a nickel-based non-soluble powder,
The nickel-based self-soluble powder
(a) 0.5 to 1% by weight of boron;
(b) 2 to 4% by weight of carbon;
(c) 3% by weight or more and less than 5% by weight of chromium;
(d) 0.5 to 1% by weight of iron;
(e) 20 to 25% by weight of nickel; And
(f) 0.5 to 2% by weight of silicon;
Metal powder for manufacturing a carbide spacer, characterized in that it comprises a.
delete The method of claim 1,
The metal powder has a powder particle size (FSSS) of 45 to 150 μm, a fluidity (50 g) of 11.5 to 12.5 sec, and an apparent density of 5.8 to 6.3 g/cm 3.
Carbide spacer comprising a carbide portion manufactured using the metal powder of claim 1 or 3.
The method of claim 4,
The carbide spacer is a carbide spacer, characterized in that for the excavator bucket.
delete The method of claim 5,
The carbide spacer connects the bucket to a hole formed in the excavator arm in order to couple the bucket to the excavator arm,
It is a disk shape with a hole for connecting the excavator arm and the bucket in the center.
Carbide spacer, characterized in that the exposed surface of the spacer is provided with 2 to 10 fixing portions to be closely fixed to the excavator arm at regular intervals.
The method of claim 7,
The exposed surface of the spacer,
Carbide spacer, characterized in that the cemented carbide portion is formed by using the metal powder of claim 1 or 3 through a plasma transferred arc (PTA) growing welding process between the fixed portions.
In the method of manufacturing a carbide spacer fixed to one side of the excavator arm and sliding with the bucket,
(i) manufacturing an integrated ring shape of carbon steel;
(ii) forming a fixing part for fixing with the excavator arm on one surface of the ring shape;
(iii) forming a carbide portion through plasma transfered arc (PTA) growth welding between the fixed portions formed on one surface of the ring shape,
The cemented carbide part is performed by plasma transfer arc growth welding using the metal powder of claim 1 or 3 as a thermal spraying material,
Carbide spacer manufacturing method, characterized in that the plasma transition arc growth welding is performed under a working current of 110 ~ 140A.
The method of claim 9,
The carbide spacer manufacturing method, characterized in that formed by repeatedly performing a plasma transfered arc (PTA) growth welding process one or more times so that a desired film thickness is formed.
The method of claim 9,
The cemented carbide spacer manufacturing method, characterized in that after the plasma transferred arc (PTA) build-up welding process, the build-up welding film is mechanically polished to form a smooth ultra-mirror surface and a uniform thickness.
delete

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