KR101786256B1 - Clad using copper-ferrous alloy powder and manufacturing method of the same - Google Patents

Clad using copper-ferrous alloy powder and manufacturing method of the same Download PDF

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KR101786256B1
KR101786256B1 KR1020150184655A KR20150184655A KR101786256B1 KR 101786256 B1 KR101786256 B1 KR 101786256B1 KR 1020150184655 A KR1020150184655 A KR 1020150184655A KR 20150184655 A KR20150184655 A KR 20150184655A KR 101786256 B1 KR101786256 B1 KR 101786256B1
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alloy powder
copper
copper alloy
weight
iron
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KR1020150184655A
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KR20170075838A (en
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김진홍
송민석
이재영
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주식회사 포스코
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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
    • 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
    • B23K35/0272—Rods, electrodes, wires with more than one layer of coating or sheathing material
    • 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
    • B23K35/302—Cu 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
    • B23K35/22—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
    • B23K35/3053—Fe 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
    • B23K35/40—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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • B23K35/406—Filled tubular wire or rods

Abstract

The bonding material using the copper alloy powder according to one embodiment of the present disclosure includes a copper alloy powder composed of 30 to 95% by weight of resin and copper (Cu) and 5 to 70% by weight of iron (Fe). By including the copper alloy powder in the bonding material, the process can be minimized and the manufacturing cost can be reduced in the process of manufacturing the shielding material, and the electromagnetic wave shielding effect can be secured.

Description

TECHNICAL FIELD [0001] The present invention relates to a bonding material using a copper alloy powder and a method for manufacturing the same.

The present disclosure relates to a bonding material using a copper alloy powder and a manufacturing method thereof.

Metal bonding is a method of integrating individual metal base materials, and is broadly divided into welding, brazing, and soldering. Welding uses a welding rod to melt the base material at the time of welding. The welding and soldering are difficult because the base material is difficult to melt. Therefore, the insert material is integrated between the base materials by melting the insert material. At this time, the welding material and the insert used for the integration of the base material are referred to as a bonding material.

Since the metal bonding is basically a method of integrating through melting, homogeneous and heterogeneous materials having a melting point similar to that of the bonding material are advantageous.

Particularly, since copper (Cu) and iron (Fe) have different melting points of individual base metals, physical joining using bolts or the like is mainly used because of difficulty in joining using welding / soldering / soldering. Precious metals such as silver (Ag) and copper (Cu) alloys such as CuNi and CuNi are used for joining copper (Cu) and iron (Fe). However, precious metals are expensive, ) Alloys have a disadvantage in that the bonding strength is lowered due to the formation of oxides by the additive elements.

Therefore, a material for a bonding material capable of bonding copper (Cu) and iron (Fe) while reducing the manufacturing cost is required.

The following Patent Document 1 relates to a metal-cored welding material for welding.

Japanese Laid-Open Patent Application No. 2008-126281

An embodiment of the present disclosure is to provide a bonding material using a copper alloy powder capable of bonding copper (Cu) and iron (Fe) with reduced manufacturing cost, and a method of manufacturing the same.

The filler powder includes 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe) Based alloy powder.

The method for manufacturing a bonding material using a copper alloy powder according to an embodiment of the present disclosure includes the steps of forming a copper alloy powder by spraying a gas into a melt in which Cu and Fe are melted and forming a copper alloy powder And forming a bonding material by bending the plate to enclose the copper alloy powder, wherein the copper alloy powder comprises 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe) have.

According to one embodiment of the present disclosure, it is possible to provide a bonding material using a copper alloy powder in which manufacturing cost is reduced and bonding of copper (Cu) and iron (Fe) is possible, and a method of manufacturing the same.

1 and 2 are schematic views for explaining a method of manufacturing a bonding material according to an embodiment of the present disclosure.

Preferred embodiments of the present disclosure will now be described with reference to the accompanying drawings.

However, the embodiments of the present disclosure are provided to more fully describe the present disclosure to those skilled in the art.

The embodiments of the present disclosure can be modified into various other forms, and the scope of the present disclosure is not limited to the embodiments described below.

In addition, to include an element throughout the specification does not exclude other elements unless specifically stated otherwise, but may include other elements.

Hereinafter, a bonding material using the copper alloy powder according to the present disclosure will be described in detail.

The bonding material 200 using the copper alloy powder according to one embodiment of the present disclosure includes a shell 11 and a filler powder 12 filled in the shell. The filler powder 12 is composed of copper (Cu) 95 weight% and iron (Fe) 5 weight% to 70 weight%.

The filled powder 12 may have a filling rate of 70 to 90 wt% with respect to the total mass of the bonding material.

The filling rate of the filled powder may cause fluctuations in the length of the welding process. Small fluctuations in the ionization potential caused by changes in the fill powder may disturb the electric arc and undesirable sputtering may occur during welding. Therefore, reducing the filling rate and sputtering fluctuation of the filler powder is important in designing the structure and composition of the bonding material.

If the filler powder exceeds 90 wt% with respect to the weight of the entire bonding material, fume is generated during welding, which may cause welding failure.

The jacket 11 may be selected from mild steel, low alloy, stainless steel and steel.

The shell 11 is made of a plate material bent to form a core.

The envelope 11 may be wound around the packed powder 12 sufficiently closely so that no gap is left between the outer surface of the plate and the inner surface of the plate.

The envelope 11 can generally be stretched to a desired size.

The shell 11 may be bent into a wrap shape wrapped around the copper alloy powder.

In the conventional bonding material, since the melting points of the individual base metals are different between Cu and Fe, the joining using welding / bare wood / soldering or the like is difficult, so that physical fastening using mainly bolts has been used. As a welding material for Cu and Fe bonding, some of the insert materials using noble metals and copper (Cu) alloys such as CuZn and CuNi are used, but they have a disadvantage of high manufacturing cost and deterioration of bonding strength.

The filled powder 12 according to the present disclosure is a copper alloy powder composed of 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe).

The copper alloy powder may have a structure in which copper (Cu) and iron (Fe) are uniformly distributed or a structure in which iron (Fe) precipitates are uniformly distributed in a copper (Cu) matrix.

That is, the copper alloy powder may be a mixture of copper (Cu) and iron (Fe) which are not mutually solid due to the inherent properties of the metal.

The copper alloy powder preferably has a core-shell structure or a structure in which iron (Fe) is uniformly distributed in copper (Cu) depending on the content of copper (Cu) and iron (Fe).

In the case of the copper-alloy alloy powder as the core-shell structure, the core is made of Fe-rich phase and the shell surrounding the core may be made of Cu-rich phase.

Generally, a rich phase means a region in which a specific component is included in a certain region at a higher concentration than in another region.

The presence of the Fe-rich phase in the core-shell structure copper-alloy powder means that the concentration (content) of Fe is higher than in the region other than the core, that is, the shell surrounding the core, The presence of the -rich phase means that the concentration (content) of copper (Cu) is higher than that of the core.

The copper alloy powder as the core-shell structure can be obtained when the content of iron (Fe) in the powder composition is 50 wt% or more.

Specifically, when the iron (Fe) precipitate is uniformly dispersed in a copper (Cu) base, the copper-alloy shell powder as the core-shell structure contains 50 to 70 wt% % ≪ / RTI > of iron (Fe).

When the iron (Fe) is uniformly distributed in the copper (Cu), it may be a structure in which copper (Cu) is a matrix and iron (Fe) is distributed as a precipitate.

The bonding material according to one embodiment of the present disclosure includes a copper alloy powder, so that the manufacturing cost is reduced and bonding of copper (Cu) and iron (Fe) is possible. In addition, the copper alloy powder can be applied to a field having a complicated shape because the product can be easily realized according to the design.

Hereinafter, a method of manufacturing a bonding material using the copper alloy powder according to the present disclosure will be described.

A method of manufacturing a bonding material using a copper alloy powder according to an embodiment of the present disclosure includes the steps of forming a copper alloy powder by spraying a gas into a melt in which copper and iron are dissolved, Wherein the copper alloy powder comprises 30 to 95% by weight of copper and 5 to 70% by weight of iron (Fe), and the step .

The step of forming the copper alloy powder includes a step of heating copper (Cu) and iron (Fe) charged in the vessel to form a melt, and spraying gas to the melt to coagulate and powder the melt .

In the case of the conventional method for producing a copper alloy powder, it is required to add additives such as various antioxidants in addition to the steps of melting, casting, plastic working, heat treatment and the like. In the case of the present disclosure, after the melting by gas atomizing The powder can be obtained without any additional process.

The copper alloy powder produced by the method of manufacturing the copper alloy powder of the present disclosure has a feature that the Cu-rich phase and the Fe-rich phase are uniformly distributed or the Fe precipitates are uniformly distributed in the Cu matrix. That is, it is possible to provide a powder in which copper (Cu) and iron (Fe), which are not mutually dissolved due to the inherent properties of metals, are uniformly mixed. In addition, since the copper alloy powder can be produced in the form of a sheet or sprayed directly onto a workpiece by spray coating or the like, it can be advantageously applied to a complicated shape.

In the gas spraying process, the raw metal is charged in a vacuum-reduced state, the metal is melted to form a melt, the melt is injected through a nozzle, and a high-pressure gas is injected into the molten melt When sprayed, the melt in the liquid phase is pulverized by quenching due to the gas.

First, copper (Cu) and iron (Fe) are prepared and charged into a container.

The copper (Cu) may be high purity with a purity of 99% or more, and iron (Fe) (electrolytic iron, 99.99%) may be used.

The chamber is accommodated in a chamber and the chamber is controlled to a vacuum state and then a high purity argon (Ar) gas is charged to prevent oxidation and contamination of copper (Cu) and iron (Fe) Create atmosphere.

The vacuum range of the chamber is not particularly limited, and it is possible to obtain a high-vacuum and low-vacuum as well as a copper alloy powder intended even in the air.

(Cu) and iron (Fe) charged in the vessel to form a melt, and the temperature in the chamber can be heated to 800 to 2000 占 폚 at a heating rate of 1 to 200 占 폚 / min.

At this time, the dissolution method may be one of a consumable electrode slag dissolution method, a plasma dissolution method, or a high-frequency induction dissolution method, but is not limited thereto.

If the temperature raising rate exceeds 200 DEG C / min in dissolving in the above-described method, the power consumption may increase and the manufacturing cost may increase. On the other hand, when the temperature raising rate is slow, it is preferable to carry out the heating at a rate of 1 占 폚 / min or more in consideration of the fact that the production time is greatly increased and the production cost is increased. The temperature raising rate is more preferably 90 to 100 占 폚 / min.

The dissolution temperature may be 800 to 2000 占 폚.

If the melting temperature is lower than 800 ° C, the solubility of Fe to Cu may be lowered so that the two metals may not be solubilized. On the other hand, if the melting point exceeds 2000 ° C, the production cost and the production time may increase. A more preferable melting temperature is 1700 to 1900 ° C.

On the other hand, it is preferable to maintain stirring and flowability of the melt by holding the melt at the melting temperature for 1 to 30 minutes. If the holding temperature is less than 1 minute, the dissolution may not be sufficiently performed. If the holding temperature exceeds 30 minutes, the energy consumption is increased and the manufacturing cost may increase.

Next, the copper alloy powder can be obtained by spraying gas onto the copper (Cu) -iron (Fe) melt.

The melt may travel through the nozzle and reach the gas atomizing device, but is not limited thereto.

The gas spraying method may be any method capable of injecting gas, for example, spraying through a spray nozzle.

The inert gas may include at least one selected from the group consisting of air, nitrogen and inert gas. Examples of the inert gas include argon (Ar), helium (He), neon (Ne), krypton (Kr), xenon (Rn), and the like, it is preferable to use argon (Ar) gas for the production cost.

The gas may be injected at an injection pressure of 50 bar (5 MPa) or less (excluding 0 bar).

By the above process, the melt rapidly coagulates due to gas spray and is made into powder. The solidification rate at which the melt solidifies may be from 10 4 to 10 6 K / s.

When a droplet is first formed in the melt upon gas spraying, iron (Fe) having a high melting point on the surface of the droplet first starts to solidify. Then, copper (Cu) having high thermal conductivity starts to solidify rapidly onto the surface of the droplet, and solidification of copper (Cu) continues from the surface of the droplet toward the center. At this time, iron (Fe) exceeding the solubility limit escapes from the Cu-rich phase and is collected at the center.

The copper alloy powder produced by the manufacturing method of the present disclosure has a structure in which copper (Cu) and iron (Fe) are uniformly distributed, or iron (Fe) precipitates are uniformly distributed in a copper Structure. That is, the copper alloy powder may be a mixture of copper (Cu) and iron (Fe) which are not mutually solid due to the inherent properties of the metal.

The copper alloy powder as the core-shell structure can be obtained when the content of iron (Fe) in the powder composition is 50 wt% or more.

Specifically, when the iron (Fe) precipitate is uniformly dispersed in a copper (Cu) base, the copper-alloy shell powder as the core-shell structure contains 50 to 70 wt% % ≪ / RTI > of iron (Fe).

When the iron (Fe) is uniformly distributed in the copper (Cu), it may be a structure in which copper (Cu) is a matrix and iron (Fe) is distributed as a precipitate.

In the present disclosure, the copper alloy powder as a filler powder can be filled in an amount of 70 to 90% by weight based on the total weight, that is, the shell weight including the fill powder.

If the filled powder exceeds 90% by weight based on the total weight, generation of fumes may increase during welding.

1 and 2 are schematic views for explaining a method of manufacturing a bonding material according to an embodiment of the present disclosure.

Controlling the composition of the packed powder may be possible with simple manufacturing equipment. As shown in Figs. 1 and 2, after the copper alloy powder is disposed on the plate 11, the plate 12 can be bent. At this time, the composition of the filled powder 12 is possible by supplying a certain amount of the filled powder 11 with respect to the cross-sectional weight of the plate 11. When the bending process is completed, the bent plate material is finally pulled out to make a slender wire-shaped bonding material 200.

When the joint material thus manufactured is used for maintenance or upbringing of parts or equipment requiring corrosion resistance and wear resistance, copper (Cu) and iron (Fe) are uniformly dispersed in the welded part, It is possible to prolong the life of the battery.

Hereinafter, the present disclosure will be described in more detail by way of examples. However, the following embodiments are only examples for explaining the present disclosure in detail, and do not limit the scope of the present disclosure.

(Example)

As shown in Table 1, the composition of Cu and Fe was adjusted to prepare a copper alloy powder by a gas injection process.

At this time, copper (Cu) and electrolytic iron, the inside of the chamber 2.0 × 10 was charged with (Fe) of high purity (99.99%) in the container of a chamber for the gas injection process - after the vacuum controlled to 3 Torr (torr) argon (Ar) gas was charged to form an atmosphere. Thereafter, the vessel was heated at a heating rate of 100 캜 / min, and then maintained at 1800 캜 for 5 minutes. Then, argon (Ar) gas was injected through the injection nozzle at an injection pressure of 50 bar or less (except for 0 bar) to prepare a copper alloy powder. The produced copper alloy powder was sintered to obtain a sintered body.

The electrical conductivity of the sintered body was measured as described above, and the results are shown in Table 1 below. In Table 1, the remainder excluding the Fe component content in the copper alloy powder is a Cu component.

The electrical conductivity was measured according to the ASTM standard (E1004), and the eddy current formed by the electromagnetic induction of the coil was measured to evaluate the electrical conductivity. The Vickers hardness was measured in accordance with ASTM standard (E348), and the hardness was evaluated after forming the pits by pressing the pyramidal diamond particles of the face angle of 136 degrees at a constant load on the material surface. At this time, the measurement load was 0.05 kg, and the average value was calculated by measuring 10 points (3 times per point) at intervals of 1 mm.

Fe content (wt%) in the copper alloy powder rescue Vickers hardness (Hv) Electrical conductivity
(% IACS) 67.2 Core-shell 246 3.5 46.8 Uniform dispersion 192 5.0 27.4 Uniform dispersion 151 15.4 8.9 Uniform dispersion 103 46.0

As shown in Table 1, the smaller the Fe content in the copper alloy powder, the greater the electric conductivity increase effect, and the higher the Fe content, the greater the hardness.

From the above results, it can be confirmed that a material having an electromagnetic shielding performance of an intended level can be manufactured and selected by appropriately controlling the Cu and Fe contents of the copper alloy powder.

As shown in Table 2, the bonding material was prepared by changing the kind of filler powder with respect to the total mass of the bonding material.

At this time, the copper alloy powder was composed of 46.8% by weight of copper (Cu) and 53.2% by weight of iron (Fe), and stainless steel was used as the outer shell.

The hardness (Hv) and the wear amount of the sleeve of the chemical pump were measured with respect to the welded portion of the sleeve, and the results are shown in Table 2.

The abrasion amount was measured as a change in weight of a test piece in a wear test carried out on a test piece having a thickness of about 6 mm by a disc-on-plate method in which a cast stellite-6 disc having a diameter of 6 mm was subjected to linear reciprocating sliding. At this time, the abrasion test conditions were such that the lubricant was not used in the ambient atmosphere at room temperature, and the slide was reciprocated 100 times at a contact stress of 103 MPa at a stroke of 9 mm and a reciprocating speed of 10 cycles / min.

division Charging material content (% by weight) Hardness (Hv) Wear amount (mg) Comparative Example 80% Ag 30 125 Example 80% Cu-Fe 208 65

As shown in Table 2 above, when welding is performed using a bonding material filled with a copper alloy powder, the hardness of the welded portion is about 208 Hv, which is equal to or higher than that of the base metal of the sleeve. However, when the bonding material filled with silver (Ag) powder was used, the dispersion of Cu and Fe in the welded part was not uniform, and the hardness was small and the deviation was also severe.

In addition, in the case of using the embodiment according to the present disclosure, the abrasion loss was greatly reduced due to the dispersing effect of the element compared to the case of using a bonding material filled with (Ag) powder. In the case of the comparative example in which the silver (Ag) was contained in the outer shell, the amount of wear was small as compared with the examples, but the trace of plastic deformation on the wear surface was observed, which was not suitable in a wear environment in which a high load was applied.

It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure, Should be interpreted on the basis of.

11: sheet material, sheath 12: filled powder
200: Bonding material

Claims (12)

coat; And
And a filler powder charged inside the shell,
The filling powder is a copper alloy powder, which is a copper alloy powder consisting of 30 to 95% by weight of copper and 5 to 70% by weight of iron.
The method according to claim 1,
Wherein the copper alloy powder includes a core in which an Fe-rich phase is present and a shell in which a Cu-rich phase is present surrounding the core.
3. The method of claim 2,
Wherein the copper alloy powder has a Fe content of 50 to 70% by weight and a copper content of 30 to 50% by weight.
The method according to claim 1,
Wherein the copper alloy powder is a copper alloy powder having a filling ratio of 70 to 90% by weight based on the total weight of the bonding material.
The method according to claim 1,
Wherein the shell is made of a copper alloy powder selected from mild steel, stainless steel and steel.
Forming a copper alloy powder by spraying a gas into a melt in which copper (Cu) and iron (Fe) are dissolved; And
Disposing the copper alloy powder on a plate; And
And bending the plate to enclose the copper alloy powder to form a bonding material,
Wherein the copper alloy powder comprises 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe).
The method according to claim 6,
The step of forming the copper alloy powder
Heating copper (Cu) and iron (Fe) charged in the vessel to form a melt; And
And spraying a gas on the melt to solidify the melt to powder the melt.
8. The method of claim 7,
Wherein the heating is carried out at a heating rate of 1 to 200 占 폚 / min and then held at 800 to 2000 占 폚 for 1 to 30 minutes.
The method according to claim 6,
Wherein the gas is at least one selected from the group consisting of air, nitrogen and an inert gas.
The method according to claim 6,
Wherein the plate material is a selected one of mild steel, stainless steel and steel.
The method according to claim 6,
Wherein the copper alloy powder includes a core in which an Fe-rich phase is present and a shell in which a Cu-rich phase is present surrounding the core.
12. The method of claim 11,
Wherein the copper alloy powder has a Fe content of 50 to 70% by weight and a Cu content of 30 to 50% by weight.
KR1020150184655A 2015-12-23 2015-12-23 Clad using copper-ferrous alloy powder and manufacturing method of the same KR101786256B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008126281A (en) 2006-11-21 2008-06-05 Nippon Steel Corp Metal cored wire for nonconsumable electrode type welding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008126281A (en) 2006-11-21 2008-06-05 Nippon Steel Corp Metal cored wire for nonconsumable electrode type welding

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