JPH06246483A - Composite wire for build-up welding to surface of ti base material - Google Patents

Abstract

PURPOSE:To provide the composite wire for build-up welding which can stably feed a filler metal by using the composite wire and with which a build-up layer having high joinability to a Ti base material and excellent wear resistance and heat resistance is obtainable and which is inexpensive and is suitable to the surface of Ti base material. CONSTITUTION:This composite wire for build-up welding to the surface of the Ti base material is constituted by packing a core material consisting of the Ti base material into the hollow of a shell material consisting of a Cu material. The composite wire contains, by the total weight of the composite wire, 10 to 70wt.% Cu, 0.1 to 6% Al and 0.1 to 4% V and the balance Ti. Then, crack does not arise and the alloyed layer having the high joinability to the Ti base material and the excellent wear resistance and heat resistance is stably and inexpensively formed if the composite wire formed by packing the core material consisting of the Ti base material into the shell material made of the Cu is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite wire for overlay welding (hereinafter referred to as "composite wire") in which a wear-resistant and heat-resistant layer is stably formed on the surface of a Ti-based material and can be economically obtained.

[0002]

2. Description of the Related Art Ti and Ti alloys are lighter (about 60% of iron) and have excellent heat resistance and corrosion resistance compared to steel materials, so they are widely used in intake and exhaust valves of automobile parts. Used and considered in the field. But T
In general, i, Ti alloys are inferior to steel materials in terms of wear resistance, and the Ti, Ti alloy materials as they are are limited in the parts and parts that can be applied as substitute materials for steel materials. Further, even when Ti or Ti alloy is already used, in recent years, as the use environment becomes more severe, further improvement in durability is required.

As a countermeasure, in addition to the improvement of the Ti alloy itself, a method of forming a wear resistant layer on the surface has been performed. For example, there are a method of forming a thin hard coating layer by PVD and CVD, and a method of forming a relatively thick hard coating layer by thermal spraying. However, the film formed by these methods is very hard, but the adhesion to the base material is weak, resulting in peeling during use.
Poor reliability due to risk of falling out. Furthermore, PVD, CV
D has a slow film formation rate, and it is difficult to form a thick film. In the case of thermal spraying, there are problems in terms of environment such as generation of noise and light rays, and there is a problem that the adhesion to the substrate is low and peeling occurs during use.

On the other hand, high-density energy sources such as lasers and arcs
The alloy source is melted together with the substrate surface using a rugged source.
A method of forming a hard alloy layer is disclosed. Take
Japanese Laid-Open Patent Publication No. 62-2702 discloses a method of hardfacing a material.
As described in Japanese Patent Publication No. 77, Ti-based alloy wear resistance
In the manufacturing method of the member, titanium, Cu, Al, V, S
Using a mixed powder made of a metal such as n or Mn,
A method of overlaying by the arc welding method has been proposed.
In addition, JP-A-2-207973 and JP-A-2-20
Japanese Patent No. 7974 discloses Ti, Ti alloy powder and Co, Cr.₃
C ₂Plasma arc melting using a mixture of
Surface of Ti, Ti alloy by contact method, TIG arc welding method
Curing methods have been proposed. However, these people
The method has the capability of feeding powder because it feeds the powder into the arc.
It becomes a problem. Normally, a gas atomized powder with good fluidity,
Feedability is improved by using powders of plasma rotating electrode
However, the cost of powder increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the alloying treatment as described above. The purpose of the present invention is to stabilize the filler metal by using a composite wire. An inexpensive composite wire for overlay welding on the surface of a Ti-based material, which can be fed by a high temperature and can stably obtain a overlay layer having high bondability with a Ti base material and excellent in wear resistance and heat resistance. Especially.

[0006]

In order to achieve the above object, the structure of the Ti-based material surface as a build-up material according to the present invention is as follows: In the composite wire filled with, the content of Cu is 10 to 70% with respect to the total weight of the composite wire, and in addition to this, Al: 0.1 to 6%, V: 0.1 to 4%
The gist exists where the balance is Ti. The overlay welding means used for the composite wire of the present invention uses gas shield arc (TIG welding), which is a simple welding method, and plasma as a melting heat source.

[0007]

According to the present invention, a core made of a Ti base material is provided in a hollow portion of a Cu outer cover material during an arc generated between a Ti base material base material shielded with an inert gas and a non-consumable electrode. By feeding the composite wire filled with the material (Ti wire containing Al, V) as the overlay welding material, a Ti alloy overlay layer containing Cu, Al, V can be formed on the surface of the Ti base material. The hardness of the build-up layer obtained in this case is required to be Vickers hardness Hv 400 to 600 from the viewpoint of wear resistance.
If it is less than v400, improvement in wear resistance is not expected, and Hv6
If it exceeds 00, cracks may occur in the overlay.

That is, the present inventors set Al in the composite wire to 4.5%, V to 3.0%, and Cu contents to 8%, 14%,
27%, 38%, 49%, 60%, 70%, 80% composite wire changed (wire diameter: 1.6 mm) and Al,
Regarding a composite wire (wire diameter: 1.6 mm) in which the amount of Cu was changed by the same amount without including V, a pure Ti plate (Hv: 17) was used.
0) was subjected to overlay welding, and the cross-sectional hardness of the obtained overlay layer was investigated.

The survey results are shown in FIG. The build-up welding conditions at this time are as follows. Overlay welding conditions Welder TIG (DCEN) Current 150A Voltage 10V Speed 10cm / min Shielding gas Main shield Ar: 25 l / min Aftershield Ar: 25 l / min Base metal JIS H 4600 TP35H Plate thickness; 3mm Width 50mm Length 100mm welding method bead on plate method

As shown in FIG. 1, in the composite wire containing no Al or V, the hardness of the overlay layer is higher than that of the base material (Hv170), but the Cu amount is 7 to obtain the overlay layer hardness Hv400.
It is necessary to contain more than 0%. However, if the amount of Cu is 80%, the familiarity of the beads becomes poor. On the other hand, A
In the composite wire containing 1 and V, the Cu content is 14% and Hv4
A hardness of more than 00 is obtained, and when the Cu content is 27%, H
Hardness exceeding v500 can be obtained. But C
When the amount of u is 80%, the hardness of the built-up layer exceeds Hv600, cracks occur, and the bead becomes less compatible. Although it is not clear why the hardness of the cladding layer exceeds Hv400 by adding Cu, Al, and V in this manner, the intermetallic compound (Ti) of Ti and Cu (Ti
₂ Cu phase) precipitates to increase the hardness, and the solid solution of Al and V in the matrix increases the strength of the matrix itself. It seems to have increased.

The reasons for limiting the components will be described below. Cu: Cu stabilizes the β phase and can increase the hardness of the buildup layer as a solid solution strengthening element or by precipitation of the Ti ₂ Cu phase. If the amount of Cu is less than 10%, it is not sufficient, and if it exceeds 70%, the hardness of the build-up layer is Hv600 or higher, cracking occurs, and the familiarity of beads becomes poor. Therefore, the Cu content needs to be in the range of 10 to 70%.

Al: Al stabilizes the α phase and
As a solid solution strengthening element of the matrix, it has the functions of increasing the hardness of the overlay metal and enhancing the high temperature oxidation characteristics. Al
If the amount is less than 0.1%, the function is not sufficient, and if it exceeds 6%, the workability as a composite wire deteriorates, so the Al amount was made 0.1 to 6%.

V: V stabilizes the β phase and also increases the hardness of the hardfacing metal as a solid solution strengthening element of the matrix. If the amount of V is less than 0.1%, its function is not sufficient.
%, The built-up layer does not contribute so much to the hardness,
Since the cost is high, the amount of V is set in the range of 0.1 to 4%.

In the hollow portion of the Cu skin material according to the present invention, Ti is contained in the hollow portion.
As a method of manufacturing a composite wire filled with a core material made of a base material, a method of inserting a core material into a metal pipe by a vibration method to draw a wire as proposed in JP-A-62-2444519, and Cu While forming the tubular hoop into a tubular shape, Ti
After wrapping the core material made of the base material, a wire drawing process may be performed. In FIG. 2, a Ti core material was filled in the hollow portion of the outer skin material made of Cu, and the Cu content was 50% and the Al content was;
The cross section of the composite wire with 3%, V content; 2% is shown.

[0015]

EXAMPLES To confirm the effect of the present invention, pure Ti (JI
SH 4600 TP35H; 3 ^t x 50 x 100 m
The bead-on-plate test by TIG welding of the non-consumable gas shielded arc welding method was carried out on the surface of m) using the composite wire (composite wire diameter: 1.6 mm) having the component composition shown in Table 1. Oxygen-free copper (JI
SH 3100: C 1020P), and using a Cu hoop to form a tubular shape, Ti containing Al and V is used.
After wrapping the core material made of the base material, wire drawing was performed to make a composite wire as a prototype. The components shown in Table 1 show the design values of the composite wire, and among the components, Ti contains Ti and inevitable impurities.

[0016]

[Table 1]

The welding conditions are shown below. Overlay welding conditions Welder TIG (DCEN) Current 150A Voltage 10V Speed 10cm / min Shielding gas Main shield Ar: 25 l / min After shield Ar: 25 l / min

With respect to the overlay of the overlay obtained by the above overlay welding test, the hardness of the overlay, cracks inside the overlay, bead surface cracks, bead appearance (bead familiarity) and the like were investigated.
Investigation of the hardness of the overlay was conducted on the weld cross-section test piece.
As shown in FIG. 3, the average value of the results obtained by measuring 10 points at a pitch of 0.5 mm between AB at a position 1 mm below the bead surface is shown. For the cracks inside the build-up layer, the cross section of the welded portion was examined with an optical microscope (× 100), and the cracks on the bead surface and the bead appearance were visually evaluated.

In Table 2, No. 1-No. No. 8 is an example of the present invention that satisfies all the requirements of the present invention.
In the u-based composite wire, the build-up layer on the surface of the base material had sufficient hardness, and there were no fine cracks in the build-up layer and no cracks on the bead surface, and the familiarity of the bead was good. On the other hand, No. Nos. 9 to 13 were comparative examples, and no satisfactory result was obtained in the characteristics of the overlay layer. In addition, No. 14
Is a comparative example containing a large amount of Al, and wire breakage occurred at the composite wire manufacturing stage, and wire drawing was not possible up to 1.6 mmφ. No.
No. 9 is a comparative example in which the amount of Cu is less than 10%, and even if a predetermined amount of Al and V is contained, sufficient hardness of the overlay layer cannot be obtained. In addition, there was no crack in the buildup layer portion and the surface, and the familiarity was good.

No. No. 10 was a comparative example in which the amount of Cu exceeded 70%, the hardness of the build-up layer exceeded Hv600, cracks occurred inside and on the surface of the build-up layer, and the familiarity of the beads was also poor. No. No. 11 was a comparative example in which Al and V were less than 0.1%, and sufficient hardness could not be obtained. In addition, there was no crack in the buildup layer portion and the surface, and the familiarity was good. No.
No. 12 is a comparative example in which Al is less than 0.1%. No. 13 was a comparative example in which V was less than 0.1%, and sufficient hardness could not be obtained. In addition, there was no crack in the buildup layer portion and the surface, and the familiarity was good.

[0021]

[Table 2]

[0022]

As described above, according to the present invention, when various skin materials and fillers are combined, filler materials having various component ratios can be easily obtained without a melting step, and Ti of the present invention can be obtained.
-If a Fe-based composite wire is used, cracking does not occur and Ti
A wear-resistant and heat-resistant alloyed layer having high bondability with a base material can be stably formed at low cost.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between Cu content, hardness, and bead familiarity in a composite wire containing Al and V and a composite wire not containing Al and V,

FIG. 2 is a view showing a cross section of the composite wire of the present invention,

FIG. 3 is an explanatory diagram showing a method for measuring the hardness of a cladding layer obtained from a Ti—Cu-based composite wire of the present invention or a comparative example.

[Explanation of symbols]

 1 Cu outer skin 2 Ti base material 3 Ti-Cu composite wire 4 Pure Ti plate 5 Overlay layer A, B Hardness measurement position

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadami Adachi 3-5-4 Tsukiji, Chuo-ku, Tokyo Inside Nittetsu Welding Industry Co., Ltd.

Claims (1)

[Claims] 1. A composite wire in which a hollow portion of a Cu outer cover material is filled with a core material made of a Ti-based material, and Cu is 10 to 70% by weight (hereinafter abbreviated as%) with respect to the total weight of the composite wire. ) A composite wire for overlay welding on the surface of a Ti-based material, characterized in that it contains Al: 0.1 to 6%, V: 0.1 to 4%, and the balance is Ti.