KR20200045256A - Carbide spacer comprising tungsten carbide and nickel-based metal and manufacturing thereof - Google Patents

Abstract

The present invention relates to metal powder for manufacturing a cemented carbide spacer that includes metal powder containing tungsten carbide powder and nickel-based metal powder and is manufactured using plasma transferred arc (PTA) overlay welding. The present invention provides metal powder for manufacturing a cemented carbide spacer, which comprises 50-65 parts by weight of tungsten carbide powder, 5-10 parts by weight of cobalt powder, and 25-40 parts by weight of nickel-based self-fluxing powder. The cemented carbide spacer according to the present invention has excellent wear resistance while being manufactured through a simple process.

Description

Metal powder and carbide spacer manufacturing method for manufacturing carbide spacer comprising tungsten carbide and nickel-based metal {Carbide spacer comprising tungsten carbide and nickel-based metal and manufacturing thereof}

The present invention relates to a metal powder for manufacturing a cemented carbide spacer comprising a tungsten carbide and a nickel-based metal and a method for manufacturing a cemented carbide spacer, and more particularly, includes a metal powder containing a tungsten carbide powder, and plasma transfer arc (Plasma Transferred Arc: PTA) relates to a method for manufacturing a metal powder and a cemented carbide spacer for manufacturing a cemented carbide spacer manufactured using a nurturing welding.

Excavator is a kind of heavy equipment used in construction and civil engineering sites, and is widely used for crushing strong ground such as rocks or excavating 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 to rotate, and a bucket having a gourd shape provided at an end of the arm unit to contain work objects 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 arm unit 1, the spacer 5 having a plurality of holes 6 must be bolted 7 to the coupling hole 2 of the arm unit 1. To this end, 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 there is a large amount of foreign matter, foreign matter can penetrate between the arm unit (1), spacer (5), and bucket, causing abnormal wear and play, even if there is no foreign matter, depending on the motion of the bucket The bucket may operate abnormally because the sliding part is worn. In order to solve this problem, according to the existing technology (Korean Patent Registration No. 10-0956998), the spacer 5 is formed of a cemented carbide welding film directly on the carbon steel body in order to form a cemented carbide layer on an iron-based base material. It is proposed to manufacture a spacer by a powder sintering process that does not require a process such as casting and sintering to separately manufacture the abrasion resistant parts, and does not require a silver soldering process requiring skill.

However, these known techniques have limitations such as non-uniformity of powder distribution during powder powdering process, and reliance on manual production. Therefore, the present invention intends to present a cemented carbide spacer by a PTA (Plasma Transfered Arc) process, which is simpler and more automated than the existing technology, and has a simple wear-resistant and uniform wear property by a cemented carbide-grown welding film. .

Korean Registered Patent No. 10-0956998

In order to solve the above-mentioned problems, the present invention is a simple process of forming an abrasion-resistant portion on a sliding portion of a cemented carbide spacer, and a method for manufacturing a metal powder and a cemented carbide spacer having an excellent wear-resistance life while being easily combined with a cemented carbide spacer. Is to provide

In order to solve the above-mentioned problems, the present invention according to the first aspect is a metal powder for preparing a cemented 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 nickel-based soluble powder. Gives

The nickel-based self-soluble powder is (a) boron (Boron) 0.5 to 1 part by weight; (b) 2-4 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.

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 cemented carbide spacer comprising a cemented carbide portion manufactured using the metal powder.

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

The carbide spacer may be for an excavator bucket.

The cemented carbide spacer connects the bucket to a hole formed in the excavator arm to couple the bucket to the excavator arm, and has a disc 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 is 2 to 10 fixing parts to be closely fixed to the excavator arm may be provided at regular intervals.

The exposed surface of the spacer may use the metal powder to form a cemented carbide portion between the fixed parts through a plasma transfer arc (PTA) foster welding process.

The present invention according to the third aspect is a method for manufacturing a cemented carbide spacer that is fixed to one side of an excavator arm and slides against a bucket, comprising: (i) manufacturing an integral 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 cemented carbide part through a plasma transfer arc (PTA) foster welding between fixed parts formed on one surface of the ring form, and the cemented carbide part uses the metal powder as a thermal spray material. Provided is a method for manufacturing a cemented carbide spacer, characterized in that it proceeds with a plasma shifting arc nurturing welding.

The cemented carbide may be formed by repeatedly performing a plasma-transferred arc (PTA) foster welding process one or more times to form a desired film thickness.

After the plasma transfer arc (PTA) growth welding process, the cemented carbide may mechanically polish the growth welding film to form a uniform thickness.

The plasma transfer arc (PTA) foster welding may be performed under a working current of 110 to 140A.

According to an embodiment of the invention,

Since the cemented carbide build-up welding film is directly formed on the carbon steel body, there is no need for processes such as casting and sintering to separately manufacture the abrasion resistant parts of cemented carbide materials, and there is no need for silver soldering process that requires skill. Not only is this eliminated, it is more advantageous for automation.

The cemented carbide spacer according to the embodiment of the present invention has a simple manufacturing process, but has excellent abrasion resistance and uniform abrasion characteristics by a cemented carbide overcoat.

1 is an exploded perspective view showing a cemented 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 is an enlarged view of a tungsten carbide (WC) powder, a cobalt (Co) -based soluble powder, and a metal powder mixed therewith, used in an embodiment of the present invention.
Figure 4 shows the results of the wear resistance test according to an embodiment of the present invention.
Figure 5 shows the Rockwell hardness test results according to an embodiment of the present invention.
FIG. 6 is a photograph of a cemented carbide spacer after plasma-transferred arc cultivation welding according to an embodiment of the present invention (a) after PTA work is completed, (b) after plane polishing and (c) after the surface treatment. will be.
7 is an enlarged photograph of a change in cemented carbides different from the amount of current supplied according to an embodiment of the present invention.
8 is a cemented carbide and cemented carbide-base interface tissue picture of a cemented carbide spacer according to an embodiment of the present invention, (a) is a tungsten carbide and cobalt particles are preserved form and the underlying tissue picture, (b) is PTA method The cemented carbide-base interface photo, ① is an enlarged SEM picture of tungsten carbide and cobalt particles in (a), ② is a base tissue picture in (a) above, ③ is an enlarged SEM picture of the interface part in (b) above. Each is shown.
9 is a photograph of actually applying a cemented carbide spacer according to an embodiment of the present invention to an excavator arm.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the description of the present invention, when it is determined that a detailed description of related known technologies may obscure the subject matter of the present invention, the detailed description will be omitted. Throughout the specification, when a part “includes” a certain component, this means that other components may be further included instead of excluding the other component, unless specifically stated to the contrary.

The present invention can be applied to various transformations and can have various embodiments, and thus, specific embodiments will be illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all conversions, equivalents, and 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 existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features, numbers, or steps. It should be understood that it does not preclude the existence or addition possibility of the operation, components, parts or combinations thereof.

The present invention relates to a metal powder for producing a cemented 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 nickel-based soluble powder.

Tungsten carbide has a very high strength and is used in the manufacture of machine tools, armored shells for tanks, and ballpoint pens. 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 direct casting or forging. Therefore, it is used by sintering cobalt or nickel 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 a powder having an apparent density of 7.3 to 7.4 g / cm 3. It is preferred to use. If the purity of tungsten carbide is less than 99% by weight, the desired strength does not appear, and even when tungsten carbide out of the above properties is used, the strength of the produced carbide spacer may be deteriorated.

The metal powder for manufacturing a cemented carbide spacer may further include 25 to 40 parts by weight of a nickel-based self-soluble powder, and the nickel-based self-soluble powder may include (a) 0.5 to 1 part by weight of boron; (b) 2-4 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.

When nickel is less than 20 parts by weight, it does not function as a binder, and there are problems such as a decrease in strength due to a large number of pores in the tissue, and in the case of more than 25 parts by weight, a decrease in hardness occurs because the binder is more than tungsten carbide. Occurs. Chromium is added as a role of improving hardness and increasing corrosion resistance, and if it is out of the above range, it cannot perform that role. Boron imparts an effect of improving wettability so that the self-soluble powder is melted to easily encapsulate tungsten carbide, and when it is less than 0.5 part by weight, the effect of improving wettability is significantly low, and when it is more than 1 part by weight, the fracture resistance is lowered and strength is greatly lowered. . Silicon lowers the melting point by forming a solid solution with nickel, and if it is less than 0.5 part by weight, the effect of the melting point decreases is small or small.

The cobalt powder and the nickel-based soluble powder are melted to form a matrix, and may include tungsten carbide powder therein. In this case, the cobalt powder and the nickel-based self-soluble powder are preferably those having properties of powder particle size (FSSS) 45 to 150 μm, fluidity (50 g) 15 to 16 sec, and apparent density of 4.3 to 4.4 g / cm 3. When cobalt powder and nickel-based soluble powder that are out of the above properties are used, the matrix may not be formed properly or the dispersion of tungsten carbide on the matrix may not be smooth, so that the strength of the cemented carbide spacer may be deteriorated.

In addition, 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 metal powder is preferably composed of a mixture of the tungsten carbide powder, cobalt powder, and nickel-based self-soluble powder, so it is preferable to have the above properties.

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

The carbide spacer may be a carbide spacer for excavator buckets.

The cemented carbide spacer may be manufactured using a metal powder composed of tungsten carbide, cobalt, and nickel-based 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 Self-soluble powder may include 25 to 40 parts by weight. In addition, when manufactured using a metal powder composed of tungsten carbide and cobalt as described above, the cemented carbide spacer has 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 cemented carbide spacer 5 connects the bucket to the hole 4 formed in the excavator arm to couple the bucket to the excavator arm 1, and a hole is formed in the center to connect the excavator arm 1 and the bucket. It is in the shape of a disc, and 2 to 10 fixing parts 6 for being fixedly fixed to the excavator arm 1 may be provided at regular intervals on the exposed surface of the spacer.

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

The cemented carbide spacer 5 according to an embodiment of the present invention is in the form of a ring integrally made of carbon steel, and can be manufactured through a casting process and additional machining. The sliding portion of the carbon steel cemented carbide spacer 5, which requires a high level of hardness and abrasion resistance, is provided with abrasion resistance by forming a plasma-transferred arc-producing welding coating film using a durable metal powder as a filler.

Referring to FIG. 1, a cemented carbide spacer according to an embodiment of the present invention may be manufactured in a disc shape, and a hole for connecting an excavator arm 1 and a bucket may be provided at 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 cemented carbide spacer 5 may be composed of a non-exposed surface that is a part in contact with the excavator arm and an exposed surface that is a part in contact with the bucket, and 2 to 10 pieces for being securely fixed to the excavator arm, preferably on the exposed surface Preferably, 4 to 8, more preferably, 6 fixing parts 6 may be provided at regular intervals. If the number of fixing parts is less than two, the fixing of the cemented carbide spacer 5 may not be smooth, and thus may be detached during operation. When more than ten fixing parts are provided, the area of the cemented part formed between the fixing parts 6 is reduced The strength of the cemented carbide spacer may drop.

The exposed surface of the spacer may use the metal powder to form a cemented carbide portion between the fixed parts through a plasma transfer arc (PTA) foster welding process.

During the plasma transfer arc growth welding process, the cemented carbide powder is transferred to the plasma torch in an inert gas atmosphere and melted while being ejected directly into the arc, and melt-bonded to the surface of the base material (see FIG. 2). Plasma shift arc growth welding is advantageous in that it is easy to synthesize carbide powder, can form a relatively thick growth welding film, has low cost, high heat input, high welding efficiency, and easy workability.

At this time, when forming a welding film by plasma-transferred arc nurturing welding, in order to achieve a smoothness of the welding film surface and to prevent cracks in the welding interface, the welding film is subjected to a single welding transfer process on the target surface of the base material. It is preferably formed. However, two or more types of nursing welding films may be stacked or used, or when a thick welding film is required, the plasma shifting arc nurturing 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 sufficient wear life. The maximum thickness of the welding film is preferably limited to the thickness that can be achieved by one plasma transfer arc cultivation welding, and considering the durability of the welding film and 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 nickel-based soluble powder, as described above.

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

The present invention according to the third aspect is a method for manufacturing a cemented carbide spacer that is fixed to one side of an excavator arm and slides against a bucket, comprising: (i) manufacturing an integral 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 cemented carbide part through a plasma transfer arc (PTA) foster welding between fixed parts formed on one surface of the ring form, and the cemented carbide part uses the metal powder as a thermal spray material. It relates to a method of manufacturing a cemented carbide spacer, characterized in that proceeds by plasma transfer arc nurturing welding.

The cemented carbide may be formed by repeatedly performing a plasma-transferred arc (PTA) foster welding process one or more times to form a desired film thickness.

After the plasma transfer arc (PTA) growth welding process, the cemented carbide may mechanically polish the growth welding film to form a smooth surface and a uniform thickness.

The plasma transfer arc (PTA) foster welding may be performed under a working current of 110 to 140A. The amount of current supplied from the plasma shift arc welding is a major factor in determining the plasma generation amount and the welding temperature. In the present invention, when the working current is less than 110A, the melting of the cobalt powder and the nickel-based self-soluble powder is not smooth, so separation of the tungsten carbide and the cobalt powder and the nickel-based self-soluble powder occurs, and when a current exceeding 140A is supplied, the tungsten carbide The strength may be lowered by melting or reprecipitating the particles.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described to be easily carried out by those of ordinary skill in the art. In addition, in the description of the present invention, when it is determined that detailed descriptions of related well-known functions or known configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. In addition, some features shown 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

58.9% by weight of tungsten carbide with 99% by weight 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, Metal powder was prepared by mixing 32.7% by weight of a nickel-based soluble powder composed of 1.1% by weight of silicon.

The metal powder on the cemented carbide spacer base was formed with a thickness of 5 mm on the sliding surface of the sliding portion by using a plasma transfer arc growth method. At this time, the working current was performed at 120A. After forming a nurturing welding film, a cemented carbide spacer was produced through plane polishing.

Example 2

In Example 1, the same operation was performed except that 140A was used.

Example 3

In Example 1, 60% by weight of tungsten carbide and 40% by weight of nickel-based soluble powder were used, and the same experiment was conducted except that 110A was used as the working current.

Example 4

In Example 3, the same operation was performed except that 140A was used.

Comparative Example 1

In Example 1, the same operation was performed except that 100A was used.

Comparative Example 2

In Example 1, the same operation was performed except that 160A was used.

Comparative Example 3

In Example 1, except that the working current was used at 180 A, the same operation was performed.

Experimental Example 1

Using the cemented carbide spacers prepared in Examples 1 to 4, a wear resistance test was performed by the method shown in ASTM G65-B.

Before experiment (g) After experiment (g) Deviation Amount of wear 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, 58.9% by weight of tungsten carbide, 8.4% by weight of cobalt, 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, 1.1% by weight of silicon Using a metal powder mixed with, by supplying a current of 120A it was found that the durability of the cemented carbide spacer using the plasma shift arc growth method is the highest.

Experimental Example 2

Rockwell hardness was specified using the cemented carbide spacers prepared in Examples 1-4. The specificity of Rockwell hardness was performed using DTR-200N of Daekyung Tech, and it was measured by calculating the average value of 5 times minus the minimum and maximum values after each 7 measurements using the finished surface specimen.

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 Figure 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 cemented carbide spacer using the plasma shifting arc cultivation method by supplying a current of 120 A was highest.

Experimental Example 3

The cross-sectional tissues were measured using the cemented carbide spacers prepared in Examples 1 and 1 to 3. As shown in FIG. 11, in the case of Comparative Example 1 in which the current was supplied at 100A, a phenomenon in which the matrix part and the tungsten carbide produced by the cobalt powder and the nickel-based self-soluble powder were separated, and when the current was supplied more than 160A It was confirmed that chemical changes such as melting or reprecipitation of tungsten carbide occurred due to the high calorific value.

Experimental Example 4

The composition ratio of the cemented carbide portion of the cemented carbide spacers prepared in Examples 1 and 3 was investigated. Table 3 shows the measured composition ratio.

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 composition ratio of the cemented carbide portion is higher than that of the metal powder. As a result, the content of iron was increased as a result of bonding with the base iron by the plasma shifting arc growth method. Through this, it can be confirmed that the metal powder according to the present invention is strongly coupled with the base by a plasma shifting arc cultivation method. In addition, as shown in FIG. 12, in the case of using an appropriate plasma transfer arc growth welding method (b, ②, ③ in FIG. 8), tungsten carbide, cobalt, and nickel-based self-soluble particles are evenly distributed in the base layer melted at the interface with iron. It can be seen that it has high hardness and wear resistance due to tungsten carbide, which has a distribution and suppressed particle growth.

As the specific parts of the present invention have been described in detail above, 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, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 Excavator arm 2 Fixing part in excavator arm
3: Pin insertion part 4: Hole part
5: cemented carbide spacer 6: fixing part

Claims (12)

Metal powder for manufacturing a cemented 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 nickel-based soluble powder.
According to claim 1,
The nickel-based self-soluble powder is
(a) 0.5 to 1 part by weight of boron (Boron);
(b) 2-4 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;
Metal powder comprising a.
According to claim 1,
The metal powder is characterized in that the powder particle size (FSSS) is 45 ~ 150㎛, the fluidity (50g) is 11.5 ~ 12.5sec, and the apparent density is 5.8 ~ 6.3g / cm3.
A cemented carbide spacer comprising a cemented carbide portion manufactured using the metal powder of any one of claims 1 to 3.
According to claim 4,
The carbide spacer is a carbide spacer, characterized in that for the excavator bucket.
According to claim 4,
The cemented carbide
20-30 parts by weight of tungsten carbide, 4-6 parts by weight of cobalt, 0.1-1 part by weight of boron, 5-15 parts by weight of carbon, 2-3 parts by weight of chromium, 40-50 parts by weight of iron, 8-15 parts by weight of nickel, and A cemented carbide spacer comprising 2 to 4 parts by weight of silicon.
The method of claim 5,
The cemented carbide spacer connects the bucket to a hole formed in the excavator arm to couple the bucket to the excavator arm,
It is a disc shape with a hole for connecting the excavator arm and the bucket in the center.
Carbide spacer, characterized in that provided on the exposed surface of the spacer is provided with a fixed interval of 2 to 10 fixing parts for close contact with the excavator arm.
The method of claim 7,
The exposed surface of the spacer,
A cemented carbide spacer, characterized in that a cemented carbide portion is formed through a plasma transfer red arc (PTA) cultivation welding process between the fixed portions using the metal powder of any one of claims 1 to 3.
In the manufacturing method of the cemented carbide spacer is fixed to one side of the excavator arm and in contact with the bucket,
(i) preparing an integral 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 cemented carbide portion through a plasma-transferred arc (PTA) nurturing welding between fixing portions formed on one surface of the ring shape,
The method of manufacturing a cemented carbide spacer, characterized in that the cemented carbide portion is subjected to a plasma-transferred arc-growth welding using the metal powder of any one of claims 1 to 3 as a thermal spray material.
The method of claim 9,
The method of manufacturing a cemented carbide spacer, wherein the cemented carbide portion is formed by repeatedly performing a plasma transfer arc (PTA) foster welding process one or more times to form a desired film thickness.
The method of claim 9,
The cemented carbide portion after the plasma transfer arc (Plasma Transferred Arc: PTA) nurturing welding process, the method of manufacturing a cemented carbide spacer characterized in that to form a smooth carbide surface and a uniform thickness by mechanically polishing the nurturing welding film.
The method of claim 9,
The plasma transfer arc (Plasma Transferred Arc: PTA) foster welding is characterized in that is performed under a working current of 110 ~ 140A carbide spacer manufacturing method.

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