JPH07204886A - Composite wire for build-up welding to surface of al-based material and wear resistant al-based member - Google Patents

Abstract

PURPOSE:To provide a wear resistant Al-based member formed with a hardened layer by a composite wire for gas shielded arc welding which has high joinability to the Al-based material and with which a build-up layer having excellent wear resistant and heat resistant at room temp. and high temp. is stably obtainable. CONSTITUTION:This composite wire is formed by packing elements for forming an intermetallic compd. of a powder and granular material contg. hardening particles or the hardening particles and Al within a sheath 1 consisting of a Cu-based material. The composite wire for build-up welding to the surface of the Al-based material 2 contains 20 to 85wt.% Cu and 1 to 60% hardened particles by the total weight of the wire and 1 to 40% at least 1 kinds of the intermetallic compd. forming elements selected from Co, Cr, Fe, Ni, Ti and Zr is obtd.. The hardened layer is formed by a gas shielded welding method using this wire. The wear resistant Al-based member formed with the wear- and heat-resistant built-up layer having the high joinability to the Al-based material at room temp. and high temp. is inexpensively obtd.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a composite wire for gas shielded arc overlay welding, in which a hardened layer having excellent wear resistance and heat resistance can be stably and economically obtained on the surface of an Al-based material, and a composite wire for the same. The present invention relates to a wear-resistant Al-based member having a hardened layer formed by a gas shield welding method used.

[0002]

2. Description of the Related Art Al or Al alloys are used in a wide range of fields including automobile parts because they are lighter in weight and have better thermal conductivity and corrosion resistance than steel materials.
However, Al alloys are generally inferior in strength, wear resistance, and heat resistance to steel materials, and the parts and parts that can be applied as substitute materials for steel materials are limited if the Al alloy materials are used as they are. Further, even when Al or Al alloy is already used, in recent years, further improvement in durability is required as the use environment becomes severe.

As a countermeasure, in addition to improving the Al alloy itself, a build-up welding method is used as one of the methods for forming a wear resistant and heat resistant layer on the surface. For example, JP-A-5
In JP-A 8-215291, Co, Ni, and M are added to Al.
An Al-based material containing n, Fe, Cu, Si and the like is shown. However, an Al-based material containing a large amount of these elements in Al can be manufactured by a casting / extrusion method, a pressure solidification extrusion method, or the like, but the manufacturing process is complicated, and it is difficult to use as an automated material. Diameter (1.2 or 1.
6 mmφ) is difficult.

Furthermore, JP-A-3-169494, JP-A-3-257173, and JP-A-3-257174.
In Japanese Patent Laid-Open No. 3-257175, a metal wire other than Al, an intermetallic compound-forming metal powder (N
i, Cu, Cr, Fe, Ti, Zr, Mn, V, Nb,
Mo, Hf, Ta, etc.) or hard particles (TiC, WC,
Filler material for automatic welding (1.ZrC, NbC, etc.).
6 mmφ) is shown, but it is not sufficient for practical use because there is no description of specific component ranges and the like. Further, in JP-A-5-277784, in an aluminum alloy sheath,
A welding wire for strengthening the surface of an Al-based material is disclosed, in which a hardfacing powder containing ceramic powder and an auxiliary wire of the same material as the sheath are inserted.

However, the above welding wire has the following problems because it uses Al for the outer cover. Its electrical conductivity is slightly inferior to that of copper and it lacks arc stability. When the melting point (Al; 660 ° C.) of the outer cover material is lower than the melting point of the intermetallic compound-forming metal powder or the hardened particles of the filler, if the difference is large,
The hardened layer tends to generate a non-uniform structure. Due to the above factors, variations in hardness of the hardened layer become large, which causes uneven wear.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its object is to have a high bonding property with an Al-based material and to withstand the room temperature and high temperature. It is intended to provide a composite wire for gas shield arc welding in which a built-up layer having excellent wear resistance and heat resistance can be stably obtained, and an abrasion resistant Al-based member having a hardened layer formed by the composite wire.

[0007]

In order to achieve the above object, the constitution of the present invention as a build-up material on the surface of an Al-based material is such that a Cu-based material (including a Cu alloy) is hardened in an outer coat. In the composite wire filled with the granular material containing particles, the amount of Cu is 20 to 85 with respect to the total weight of the wire.
%, The amount of hardened particles; 1 to 60%, with the balance consisting of Al and unavoidable impurities, or an intermetallic compound forming element of hardened particles and Al in the outer skin made of a Cu-based material (including Cu alloy) In the composite wire filled with, the amount of Cu is 20 to 85%, the amount of hardened particles is 1 to 60%, the amount of Co, Cr, Fe, Ni, Ti, and Zr with respect to the total weight of the wire.
The gist is that it contains at least one or more intermetallic compound-forming elements selected from the above: 1 to 40%, and the other balance is Al and inevitable impurities.

In the wear resistant Al-based member of the present invention, the composite wire is used on the surface of the Al-based material to form a hardfacing layer by an inert gas shielded arc welding method. And contains 10 to 53% Cu
It is characterized in that it is contained, or in addition, one or more kinds of intermetallic compound forming elements Co, Cr, Fe, Ni, Ti and Zr are contained.

[0009]

According to the present invention, the composite wire is fed into the arc generated between the Al base material base material and the non-consumable electrode (in the arc shielded by the inert gas), or By feeding the or composite wire as a consumable electrode, a build-up layer containing Cu and hardened particles can be formed on the surface of the Al-based material. Specifically, the high temperature (2
(00 ° C.), and in the second invention at room temperature, a build-up material for forming a wear-resistant and heat-resistant build-up layer on the surface of an Al-based material was studied. As a result, desired wear resistance and heat resistance can be stably obtained, and further, in view of economical efficiency, manufacturability (drawability), etc., hard particles, an Al-based material in a pipe or hoop of Cu or Cu alloy. "Al-based (including Al alloy) wire or Al-based (including Al alloy) powder" filling,
It has also been found that it is desirable to fill the cured particles with an Al-based material, and further with an intermetallic compound-forming element of Al. In order to obtain stable wear resistance and heat resistance at room temperature and high temperature, the hardness of the overlay is Vvickers hardness of Hv1.
It is necessary to be 50 or more, and if Hv is less than 150, improvement in wear resistance is not expected.

The experimental process of the present invention and the reasons for limiting the components are shown below. First, regarding the first invention, the present inventors filled the Cu-based sheath with an Al-based core material, and set the amount of Cu in the wire to 35%,
And 75%, and the others are Al and inevitable impurities of 1.2 mmφ composite wire A (Cu 35%), B (Cu).
70%; composite wire cross-sectional shape, FIG. 2 (a) and Al-based Al-based pipe filled with TiC powder as an example of hardened particles.
TiC core material is filled in the Cu shell, and the amount of Cu in the wire is set to 3
5%, the amount of TiC is 20%, and the others are Al and unavoidable impurities, 1.2 mmφ composite wire C (composite wire cross-sectional shape, FIG. 2B) is prototyped, and these prototype wires are T
Overlay welding was performed using the IG welding method, and the high temperature hardness of the obtained hardened layer and base material from room temperature to 400 ° C. was investigated.
The welding conditions are shown below.

Welding conditions Polarity DC (−) Current 120A Voltage 16V Speed 10 cpm Shielding gas Inner shield, He; 25 l / min Outer shield, Ar; 25 l / min Base material AC2B; 10t × 50w × 200 l

The survey results are shown in FIG. From FIG. 1, the composite wires A, B and the composite wire C had better high temperature hardness from room temperature to 400 ° C. than the base material. However, the composite wire A has a Hv of less than 150 when the temperature is 200 ° C. or higher, and improvement in wear resistance at high temperatures cannot be expected. Also, composite wire B
Is Hv152 at 200 ° C. and exceeds Hv150, but may be less than Hv150 depending on variations in hardness due to changes in welding conditions. Further 300
When the temperature rises to 0 ° C., Hv105 is reduced, and improvement in wear resistance cannot be expected at high temperatures.

On the other hand, the composite wire C has the same amount of Cu as the composite wire A, but the hardness is higher than that of the composite wire A and the composite wire B from room temperature to 400 ° C., and Hv34 at room temperature.
Hv289 at 5,200 ℃, Hv192 at 300 ℃
Therefore, the hardness at high temperature is significantly improved. There were no cracks in each overlay. The reason why the high temperature hardness is improved by adding the hardened particles TiC is that the build-up layer of the composite wire C is a eutectic of Al and Cu and an intermetallic compound (Cu) of Al and Cu.
Al ₂ ) and hard particles TiC are dispersed in the structure. That is, the hardness of CuAl ₂ is Hv 400 to 600, T
Since the hardness of iC is about Hv3200, TiC
It is considered that the addition of TiC, which is harder than the intermetallic compound of Cu and Al (CuAl ₂ ), improved the hardness of the overlay. Also, the melting temperature of TiC (about 3
It is considered that when the temperature is higher than CuAl ₂ (about 591 ° C.) (140 ° C.), the softening resistance is large and thus the hardness at high temperature is improved.

A Cu-based hoop or pipe is used as the skin material of the composite wire of the present invention, and the Cu content is set to 20 to 85% to improve the hardness of the matrix of the overlay layer and to secure the wettability to the base material. There is a function to do. When the amount of Cu in the composite wire of the present invention is less than 20% (that is, when the amount of Cu in the hardfacing layer is less than 10 or the amount of Al exceeds 90%, the composition of the α phase is in the crystallized region), the overlay layer is formed. Most of the structure is only α phase (Al), and the hardness of the matrix is low.
The hardness at 0 ° C.) cannot be improved, and the wettability with the aluminum base material is poor and a good overlay cannot be obtained. On the other hand, when the amount of Cu in the composite wire of the present invention exceeds 85% (that is, when the amount of Cu in the hardfacing layer exceeds 53%, the composition is such that the η ₂ phase precipitates), the structure of the overlay layer becomes Causes the η ₂ phase (CuAl), which is a brittle intermetallic compound, to be deposited, so that the buildup layer is cracked. For the above reasons, the amount of Cu in the composite wire of the present invention is set to 20 to 85%. That is, the amount of Cu in the hardfacing layer of the wear resistant Al-based member of the present invention is limited to 10 to 53%.

Further, the addition of the hardened particles can improve the hardness of the build-up layer at room temperature and high temperature. The improvement of high temperature hardness can be achieved by adding 1% or more of hardened particles and further adding Cu together. If it is less than 1%, carbides such as TiC and NbC,
The amount of hardened particles such as nitrides, borides, and oxides dispersed is small, and the hardness at high temperatures cannot be improved. On the other hand, when the amount of the hardened particles exceeds 60%, the wire manufacturability is deteriorated such as the occurrence of wire breakage, the wettability with the base material is deteriorated, and the machinability of the overlay layer is also deteriorated. The hardened particles here mean TiC, NbC, V ₄ C ₃ , Cr ₃ C ₂ , Zr.
Carbides such as C, WC and SiC, TiN, VN, ZrN,
NbN and other nitrides, Al ₂ O ₃ and ZrO _{2 and} other oxides,
_{TiB 2, VB 2, CrB 2} , ZrB 2, NbB more halides and TiSi _2, such as _2, VSi _2, CrSi _2, etc. silicide and Si, metal powder W, and the like.

Next, regarding the second invention, the present inventors
The base outer shell is filled with an Al base core material, the Cu content in the composite wire is 40%, and the other is Al and unavoidable impurities.
2 mmφ composite wire A (Cu 40%; composite wire cross-sectional shape, FIG. 2A) and Al hoop were filled with a mixed powder of TiC powder and Co powder, and both ends of the hoop were TIG.
Al-TiC- which was closed by welding, then rolled and drawn
A 1.2 mmφ composite wire B (composite wire cross-sectional shape, FIG. 2B) in which a CO core material was filled in a Cu outer shell was produced.
The composite wire B has a Cu content of 40%, a TiC content of 20%, and a C content.
The amount of o was 10%. These prototype wires were subjected to overlay welding using the MIG welding method shown below, and the hardness and wear resistance at room temperature of the overlay layer and the base material obtained were investigated. The wear resistance test was conducted by the pin-on-disk wear test (FIG. 3) shown in Table 1. The wear resistance was evaluated by measuring the wear weight of the pin material sampled from the overlay and dividing it by each density to reduce the wear volume. The survey results are shown in Table 2. Table 2 also shows the hardness and wear amount of the base material (JIS A 5202, AC2B) as a comparative material. The welding conditions are shown below.

Welding conditions Polarity DCEP (composite wire +) Current 180A Voltage 23V Speed 60cpm Shielding gas Inner shield, Ar; 25 l / min Composite wire protruding length; 15 mm Base material AC2B; 10t × 50w × 200 l

[0018]

[Table 1]

[0019]

[Table 2]

From Table 2, the composite wires A and B were better in hardness and wear resistance at room temperature than the base material. However, in the comparison between the composite wires, the composite wire B has the same Cu content as the composite wire A, but the hardness at room temperature is high, and the wear resistance is significantly improved. The reason why the hardness and wear resistance are improved is that the overlay layer of the composite wire A has a structure in which a eutectic of Al and Cu and an intermetallic compound (θ: CuAl ₂ ) of Al and Cu are dispersed. And the overlay of the composite wire B is A
Eutectic of l and Cu and intermetallic compound of Al and Cu (θ: Cu
Al ₂ ), hard particles TiC, and an intermetallic compound of Al and Co, Co ₂ Al _9, are dispersed.

That is, the hardness of the eutectic of Al and CuAl ₂ is about Hv 150, and the hardness of CuAl ₂ is Hv 400-60.
0, the hardness of TiC about Hv3200, Co ₂ hardness of Al ₉ is because it is Hv650～750, eutectic in the composite wire B, TiC harder than CuAl ₂ and Co ₂ Al ₉
It is considered that the hardness was improved and the wear resistance was improved due to the precipitation. In this way, by further dispersing the carbide, which is harder than the intermetallic compound of Al and Cu (θ: CuAl ₂ ): the intermetallic compound of TiC and Al (Co ₂ Al ₉ ), in the buildup layer, wear resistance is further improved. It was found that the property is improved.

Further, C which is an intermetallic compound forming element with Al
By adding at least one element selected from o, Cr, Fe, Ni, Ti, and Zr in the range of 1 to 40%, an intermetallic compound with Al that is harder than CuAl ₂ in the buildup layer is added. By precipitating, the hardness of the matrix of the overlay can be improved, and the wear resistance at high temperature can be improved. Ie Al
And Cr are CrAl ₇ : Hv500-700, Al and Fe
Is FeAl ₃ : Hv800, Al and Ni are Hv70.
0~770, Al and Ti is TiAl _3: Hv400~7
00, Al and Zr form an intermetallic compound such as ZrAl ₃ : Hv 450 to 740. Further, Ti, V, and Zr are also effective for making the overlay structure finer. 1% of these elements
If the amount is less than the above, the hardness is not improved and the wear resistance is not improved because the ratio of the intermetallic compound formed in the overlay is small. Further, when the filling is over 40%, the buildup layer may be cracked and the buildup layer may be peeled off.

The intermetallic forming element with Al is not only powder but also a component (F) contained in the Cu-based material skin and the Al-based material.
e, Cr, Ni, Ti, Zr),
For Co, Cr, Fe, Ni, Ti, Zr, etc., wire rods, pipes, etc. may be used.

The following method can be used as a method for producing a composite wire in which hard particles and Al are filled in an outer cover material made of a Cu-based material according to the present invention. The following is a description with reference to the drawings. 2 (b) (c) (d) are views showing the cross-sectional shape of the composite wire of the present invention. The composite wire and the method for manufacturing the composite wire shown in FIG. 2 (b) use a hoop for the Cu-based material outer skin 1, and form the hardened particle powder or the hardened particle powder and the intermetallic compound forming element powder while molding the hoop into a curved shape. After inserting the Al-based pipe 3 filled with the mixed powder 4, the both ends of the hoop are closed by TIG welding, laser or resistance welding, and then rolled to a predetermined diameter and drawn, or the Cu-based material shell 1 is piped. Is used, and
As disclosed in Japanese Patent No. 244519, A filled with hardened particle powder or a mixed powder 4 of hardened particle powder and intermetallic compound forming element powder from the end of the pipe while vibrating the pipe A
It can be obtained by inserting the 1 pipe 3 and then rolling and drawing to a predetermined diameter.

In the composite wire shown in FIG. 2C and the method for manufacturing the composite wire, a hoop is used for the Cu-based material outer skin 1, and the hardened particle powder or the hardened particle powder and an intermetallic compound are formed while the hoop is curved. Mixed powder 4 of elemental powder and Al
After inserting the base material 2, the both ends of the hoop are closed by TIG welding, laser or resistance welding, and then rolled to a predetermined diameter and drawn, or a pipe is used for the Cu base material outer shell 1, As disclosed in Japanese Patent Laid-Open No. 45-30937, while vibrating the pipe, the hardened particle powder or the mixed powder 4 of the hardened particle powder and the intermetallic compound-forming element powder and the Al core material 2 are inserted from the end of the pipe, and then a predetermined amount Rolled to diameter,
It can be obtained by wire drawing.

In the composite wire shown in FIG. 2 (d) and the method for manufacturing the composite wire, a hoop is used as the Cu-based material skin 1, and the mixed powder 5 of the hardened particle powder and the Al-based powder is formed while the hoop is formed into a curved shape. After inserting, insert both ends of the hoop into TI
It is closed by G welding, laser or resistance welding, and then rolled to a predetermined diameter and drawn, or a pipe is used for the Cu-based material skin 1 and the pipe is vibrated as shown in Japanese Patent Publication No. 45-30937. However, it can be obtained by inserting the mixed powder 5 of the hardened powder and the Al powder from the end of the pipe, and then rolling and drawing to a predetermined diameter.

[0027]

【Example】

Example 1 The present invention will be described more specifically. Table 3 shows the design components of the prototype composite wire and the survey results. Prototype wire (1.2
mmφ: Cross-sectional shape diagram 2 (b) shows an Al alloy casting plate (J
IS A 5202, AC2B 10 ^t × 50 × 200
mm) surface of gas shielded arc welding method MIG, T
Bead-on-plate welding was performed under the welding conditions shown by iG welding. Table 4 shows the welding conditions.

[0028]

[Table 3]

[0029]

[Table 4]

With respect to the overlay layer obtained by the above overlay welding test, the hardness of the overlay layer at room temperature, 200 ° C. and 30
A high-temperature hardness measurement at 0 ° C. and a pin-on-disk wear test (FIG. 3) under the test conditions shown in Table 1 were conducted to investigate wear characteristics. The wear characteristics were evaluated by measuring the wear weight of the pin material sampled from the overlay and dividing the wear volume by the wear volume reduction. In addition, cracks in the buildup layer, bead surface cracks, wettability with the base material, and machinability were also investigated. For cracks inside the overlay, examine the cross section of the weld with an optical microscope (× 100),
Penetration test method (JIS
The presence or absence of cracks was investigated by Z 2343).

In Table 3, No. 1-No. No. 15 is an example of the present invention satisfying all the requirements of the present invention.
1 to 7 are TIG arc welding methods, No. 8-15 is MIG
The overlay welding was performed by the arc welding method. No matter which welding method is used, the composite wire of the present invention has a built-up layer on the surface of the base material at room temperature, 200 ° C. and 300 ° C.
The high-temperature hardness of No. 1 had a sufficient value and showed good wear resistance, and there were no microcracks inside the overlay and no cracks on the bead surface. On the other hand, No. Nos. 16 to 19 are TIG arc welding methods, No. In Nos. 20 to 23, the overlay welding was performed by the MIG arc welding method, but no satisfactory result was obtained in the characteristics of the overlay layer.

That is, No. In No. 16, the amount of hardened particles was in the range of the wire of the present invention, but in the example in which the amount of Cu was less than the lower limit, sufficient hardness of the overlay was not obtained and wear resistance was poor. That is, since the amount of Cu in the build-up layer was small, the structure of the build-up layer was mostly α phase (Al), and no improvement in hardness was observed even when the hardened particles were dispersed. There were no cracks in the built-up layer or on the surface. No. 17 is C in the wire
When the amount of u exceeds 85%, that is, the amount of Cu in the overlay is more than 53%, the η ₂ phase (Cu
Since Al) was deposited, cracks were generated in the build-up layer, peeling and falling off during the abrasion test, and the amount of abrasion was large.

No. In No. 18, the amount of Cu in the wire was within the range of the present invention, but since the hardened particles were not added, the room temperature hardness of the overlay was sufficient, but the sufficient high temperature hardness was not obtained. In addition, good wear resistance was not obtained. No. 1
In No. 9, the amount of Cu in the wire was within the range of the present invention, but the amount of hardened particles exceeded the upper limit, the wettability with the base material was deteriorated, and the machinability of the overlay was deteriorated. Moreover, disconnection frequently occurred in the production of this wire.

No. In No. 20, the amount of hardened particles is in the range of the wire of the present invention, but the amount of Cu in the wire is below the lower limit and the amount of Cu in the overlay is below the lower limit, and sufficient hardness of the overlay cannot be obtained. The wear resistance was also inferior. That is, since the amount of Cu in the wire is small, the structure of the build-up layer has almost a matrix of α phase (Al), and even if the hardened particles are dispersed, the hardness is
No improvement in wear resistance was observed. There were no cracks in the built-up layer or on the surface. No. 21 is C in the wire
When the amount of u exceeds 85% (that is, the amount of Cu in the overlay is 5
If it exceeds 3%), it is a brittle intermetallic compound η ₂
Since the phase (CuAl) was precipitated, cracks were generated in the build-up layer, and peeling and falling off during the wear test resulted in a large amount of wear.

No. In No. 22, the amount of Cu in the wire was within the range of the present invention, but no hardened particles were added, and the room temperature hardness of the overlay was sufficient, but sufficient high temperature hardness was not obtained. In addition, good wear resistance was not obtained. No. 23 is C
The amount of u and the amount of cured particles were below the lower limits, and the amount of Cu in the overlay was also below the lower limits, so that the room temperature and high temperature hardness was not sufficient and good wear resistance could not be obtained. There were no cracks inside the build-up layer and on the bead surface.

Example 2 Table 5 shows design components and experimental results of the composite wire produced as a trial. For the composite wire Nos. 17, 18, and 19, two types of hardened powder particles were mixed and added at a ratio of 1: 1. A trial wire (1.6 mmφ: cross-sectional shape figure 2 (b)) was taken from an Al alloy casting plate (JIS A 5202, AC2B 10 ^t × 50).
M of the gas shield arc welding method on the surface of × 200 mm)
Bead-on-plate welding was carried out by IG welding under the welding conditions shown below. Welding conditions Polarity DCEP (composite wire +) Current 200-250A Voltage 23-24V Speed 60cpm Shielding gas Ar; 25 l / min Composite wire protrusion length; 15mm Base material AC2B; 10tx50wx200l

With respect to the overlay layer obtained by the above overlay welding test, the hardness of the overlay layer was measured at room temperature and the pin-on-disk abrasion test was conducted under the test conditions shown in Table 1 (see FIG. 3). ) Was performed and the wear characteristics were investigated. The wear characteristics were evaluated by measuring the wear weight of the pin material sampled from the overlay and dividing the wear volume by the wear volume reduction. In addition, cracks in the buildup layer, bead surface cracks, wettability with the base material, and machinability were also investigated. For the cracks inside the overlay, the cross section of the welded portion was examined with an optical microscope (× 100), and for the cracks on the bead surface, the presence or absence of cracks was examined by the penetrant flaw detection test method (JIS Z 2343).

[0038]

[Table 5]

In Table 5, No. 24-No. 42 is an example of the present invention satisfying all the requirements of the present invention. In the composite wire of the present invention, the buildup layer on the surface of the base material has a sufficient hardness at room temperature and a wear test temperature of 200 ° C. The amount of wear was 1.0 mg / density / km or less, showing good wear resistance, and there were no microcracks inside the build-up layer and no cracks on the bead surface. On the other hand, No. In Nos. 43 to 49, satisfactory results were not obtained in the characteristics of the overlay layer. That is, No. Although 43 is a hardened particle and an intermetallic compound-forming element is within the range of the present invention, a sufficient amount of hardfacing layer is obtained in a comparative example in which the amount of Cu is below the lower limit and the amount of Cu in the overlay is below the lower limit. The wear resistance was inferior. That is, since the amount of Cu is small, the matrix of the build-up layer is mostly α phase (A
It was 1), and no improvement in hardness was observed even when the cured particles were dispersed. There were no cracks in the built-up layer or on the surface.

No. No. 44 is a comparative example in which the amount of Cu exceeds 85% (that is, the amount of Cu in the overlay is over 53), and the η ₂ phase (CuAl), which is a brittle intermetallic compound, is precipitated, so that the overlay is cracked. It was generated, peeled off during the abrasion test, fell off, had a large amount of abrasion, and had poor machinability. No. 45 is Cu
The amount is within the range of the present invention, and Ni is added as an intermetallic compound forming element, but this is a comparative example in which the addition amount of the hardened particles is below the lower limit, and the wear amount is large and the wear resistance is poor. No. 46 is an amount of Cu and an intermetallic compound forming element (N
Although i) is within the range of the present invention, the amount of hardened particles exceeds the upper limit, and the machinability of the overlay was deteriorated. Moreover, disconnection frequently occurred in the production of this composite wire.

No. Although the amount of Cu and the amount of hardened particles of No. 47 were within the ranges of the present invention, the intermetallic compound-forming element (Ti) was less than the lower limit, and good wear resistance of the overlay was not obtained. There were no cracks inside the build-up layer and on the bead surface. No. 48 is a comparative example in which the amount of Cu and the amount of hardened particles are within the range of the present invention, but there are many intermetallic compound-forming elements (Ti), cracks occur in the buildup layer, and peeling and falling off during the abrasion test results in the amount of abrasion There were also many. Further, the machinability of the overlay was also poor.
No. 49 is in the range of the composite wire of the present invention, but the amount of Cu in the hardened layer exceeds the upper limit, and the η ₂ phase (CuAl), which is a brittle intermetallic compound, precipitates, so cracking occurred in the overlay layer. During the wear test, the amount of wear was large due to peeling and falling off, and the machinability was poor.

[0042]

As described above, by using the composite wire of the present invention, it is possible to form a build-up layer having excellent wear resistance and heat resistance on the surface of an Al-based material by a simple gas shield build-up welding method. However, the composite wire shown in the second invention is preferably used in a portion where abrasion resistance at high temperature is desired.

[Brief description of drawings]

FIG. 1 is a diagram showing a comparative examination of the hardness from room temperature to 400 ° C. of a built-up layer formed of a hardened particle (TiC) -added wire and a non-added wire.

FIG. 2 is a diagram showing a cross-sectional shape of a wire,

FIG. 3 is a view showing a pin-on-disk wear test device.

[Explanation of symbols]

1 Cu-based skin 2 Al-based core material 3 Al-based material or mixed powder of intermetallic compound forming element pipe, hoop, powder 4 Hardened particle powder or hardened particle powder and intermetallic compound forming element 5 Al base powder and hardened particle powder Mixed powder 6 pin 7 Overlay material 8 Al alloy casting (AC2B) 9 Disc

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Saito 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Yasutoshi Nakata 3-5-4 Tsukiji, Chuo-ku, Tokyo Industrial Co., Ltd. (72) Inventor Shigeru Kurihara 3-5-4 Tsukiji, Chuo-ku, Tokyo Nittetsu Welding Co., Ltd. (72) Yoshio Kobe Kobe 3-5-4 Tsukiji, Chuo-ku, Tokyo Nippon Steel Within Welding Industry Co., Ltd.

Claims (4)

[Claims] 1. A composite wire comprising a Cu-based material and a powdery material containing hardened particles filled in an outer skin thereof, wherein the amount of Cu is 20 to 85% by weight (hereinafter abbreviated as%) relative to the total weight of the wire. A composite wire for overlay welding on the surface of an Al-based material, characterized in that it contains 1 to 60% of hardened particles, and the balance is Al and unavoidable impurities. 2. A composite wire comprising a Cu-based material having an outer skin filled with an intermetallic compound-forming element of hardened particles and Al, wherein the amount of Cu is 20 to 85 relative to the total weight of the wire.
% By weight, amount of cured particles: 1-60%, Co, Cr, Fe,
At least one intermetallic compound forming element selected from Ni, Ti, and Zr: 1 to 40% is contained, and the balance is A
A composite wire for overlay welding on the surface of an Al-based material, which is characterized by comprising 1 and unavoidable impurities. 3. Using the composite wire for build-up welding according to claim 1, a build-up hardened layer is formed on the surface of an Al base material by a gas shield arc welding method, and hardened particles are formed in the build-up hardened layer. A wear-resistant Al-based member containing, and containing 10 to 53% of Cu. 4. The composite wire for overlay welding according to claim 2 is used to form an overlay hardened layer on the surface of an Al-based material by a gas shield arc welding method. Abrasion resistant Al containing at least one intermetallic compound forming element selected from Co, Cr, Fe, Ni, Ti and Zr and containing 10 to 53% of Cu. Base member.