JP2003211284A - Aluminum alloy wire for welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire with which stable arc-welding can be secured by improving feedability of the aluminum alloy wire for welding. <P>SOLUTION: In the aluminum alloy wire for welding, containing 1.5-6 mass% Mg, in the case of using X as a cast diameter and Y as proof stress of the wire, this aluminum alloy wire for welding satisfies the following formulas (1)-(3). 250≤X≤550 (mm)...(1), 400≤Y≤550 (N/mm<SP>2</SP>)...(2), Y≤(X+1100)/3...(3). <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding aluminum alloy.
Alloy wires, and more specifically, Mg alloy wires.
To improve feedability of aluminum alloy wire for welding containing
It is related to the technology to be improved. [0002] Aluminum used for ships and vehicles
Arc welding when welding aluminum or aluminum alloys.
Contact method (for example, TIG welding method, consumable electrode type gas shield
Arc welding, etc.) have been conventionally employed. Especially
Wear electrode type gas shielded arc welding (for example, MAG welding)
Continuous welding is possible in the welding method and the MIG welding method)
Widely used. FIG. 1 shows a gas shielded arc welding method using a consumable electrode.
It is a figure explaining an example of a contact device. Wound on spool 1
5 to 10 kg of aluminum alloy wire for welding
When referred to below as "welding wire" or simply "wire"
2) is a guide roller 4 provided in the feeding device 3
And then sent out by the push-type feeding roller 5.
Via flexible conduit tube 6
Welding torch 7 connected to the end (hereinafter referred to as “torch part”)
May be sent). Inside the welding torch 7,
Current-carrying chip 8 (hereinafter sometimes referred to as “chip section”)
Power is supplied to the welding wire by the
An arc is generated between the material 9. This generated arc
Therefore, the base material 9 is melted and dug down, while the welding wire
In a shield gas shielded from the atmosphere
Move to the material 9 side to create a molten pool, and this molten pool
Solidifies to form a weld. [0004] When performing the welding as described above, a good weld
In order to obtain it, the inside of the conduit tube, torch,
Requirements for the feedability of the welding wire in the
Become. In other words, if the feedability of the welding wire deteriorates,
Wire passing speed (feeding speed) when passing through the
As it is stable, it must be set in advance to obtain a good weld.
The relationship between the specified welding current and arc voltage can be maintained.
Because it is gone. In general, such a failure phenomenon
This is called "arc instability", and as a result
Cannot be formed, resulting in defective fusion or defective shape.
Furthermore, the passing speed of the wire when passing through the tip
If the degree of instability becomes unstable, excessive wires may be
When electricity is applied and the melted wire fuses to the tip,
In some cases. Techniques for improving the feedability of welding wires and
For example, Japanese Patent Application Laid-Open No. Hei 5-77786 discloses a linear welding.
Oil on the surface of aluminum wire
Technology to improve wire feedability has been proposed.
You. However, excessive oiling of the wire will cause an increase in hydrogen
New problems such as blowholes may occur
there were. [0006] The present inventors also disclose the smoothness of the wire surface.
To make it difficult for the feed roller to scrape
A wire with improved feedability has been proposed (Japanese Unexamined Patent Publication No. 7-3218)
No. 6 publication), the effect is raised. However, this
It is difficult to control the conditions when manufacturing ears, and further improvements
Was desired. [0007] As the aluminum alloy wire for welding,
Al-Mg based alloy (for example, JIS Z3232 A5356,
A5183, A5556, A5554) are widely used. This
The reason is that aluminum contains Mg.
As a result, the strength of the wire itself is improved.
To reduce the occurrence of buckling of wires in the tube
Because it can be. However, according to the present inventors,
By simply considering the strength of the ear, the feedability can be sufficiently improved.
I found out that I couldn't. SUMMARY OF THE INVENTION The present invention relates to such a state.
The purpose was to
By improving the feedability of the aluminum alloy wire,
To provide a wire that can ensure stable arc welding
It is in. Means for Solving the Problems To solve the above problems
Aluminum alloy wire for welding according to the present invention and
Is aluminum aluminum for welding containing 1.5 to 6% by mass of Mg.
Alloy wire having a cast diameter of X and an endurance of the wire
A point satisfying the following expressions (1) to (3) when Y is the force.
Have a gist. 250 ≦ X ≦ 550 (mm) (1) 400 ≦ Y ≦ 550 (N / mm ^Two ) (2) Y ≦ (X + 1100) / 3 (3) However, in the present invention, the “cast diameter” means a spool.
Release the welding aluminum alloy wire wound around
Means the loop diameter of the loop formed when The present inventors have solved the above-mentioned problems.
As a result of various considerations, the wire contains Mg
And spool aluminum alloy wire for welding
Between the cast diameter when released from
Control can improve wire feedability.
And found that a stable arc could be maintained.
Was completed. Hereinafter, the operation and effect of the present invention will be described.
You. An aluminum alloy wire for welding according to the present invention.
The content of Mg is 1.5 to 6% (meaning "mass%".
Same. ). Like this
The reasons for the limitation are as follows. [0012] Mg: 1.5-6% Mg is an element that increases the strength of the wire, and
To reduce buckling of the wire in the path when feeding
Can be. Also, an aluminum alloy containing Mg
When wires are used for welding, solid solution strengthening is performed at the joint after welding.
And the strength of the joint can be increased. Like this
In order to obtain an effect, Mg should be contained by 1.5% or more, preferably 1.6% or more.
% Or more. However, excessive Mg content
Then, cracks occur when manufacturing wires by wire drawing
Mg content is preferably 6% or less, preferably 5.8%.
% Is better. An aluminum alloy wire for welding according to the present invention.
As described above, Mg contains Mg. Soshi
These wires are easy to handle during welding
Is usually wound around a spool to
However, before winding the wire around the spool,
Generally, a certain degree of habit is given in advance. Sandals
Then, plastically deform the wire before winding it around the spool.
After adding a habit, it is wound around a spool. Like this
When the wire with the habit is released from the spool, there is
It becomes a loop shape having a diameter of about. In the present invention,
Loop formed by the wire when released from the loop
The diameter of the loop is referred to as the “cast diameter”. Next, the wire released from the spool is:
Sent to the feeder, and further inside the conduit tube
Pass, but at this time, the conduit tube is bent intricately
The wires will travel through complex paths.
Therefore, it is deformed by receiving force until it reaches the tip
Resulting in. For example, a wire with a habit is supplied to a feeding device.
When supplied, the wire is guided by a guide row provided in the feeding device.
Contact with rollers and feed rollers.
Is the one where the cast diameter increases due to the force from the roller
Direction (that is, the direction in which the wire becomes linear).
The total length of the conduit tube is usually about 2 to 6 m.
Therefore, the conduit tubes may be bundled or meandering
Often arranged. At this time,
The curvature of the path through which the wire passes rather than the strike diameter (curvature)
Is small, the wire passes through the conduit tube
When the cast diameter becomes smaller
You. Therefore, the wire reaches the current-carrying tip from the spool.
In the meantime, the wire has a habit. As described above, the wire reaches the chip portion
Sometimes, the wire has a habit, so
Diameter (curvature) does not match the shape inside the conducting chip
Therefore, the wire contacts the inner wall of
A frictional force is generated between the chip and the inner wall of the chip. This friction force
If it gets too big, the wire gets caught in the tip,
The wire feeding speed becomes unstable. Wire feeding speed
When unstable, the wire at the tip may over-energize
This causes the wire to fuse to the chip portion. Especially Mg
Strong wire containing pure aluminum wire
Since it is harder than ears, the frictional force tends to increase.
This causes a decrease in wire feedability, and furthermore
Had chip fusion. Therefore, the present inventors
Curvature of welding wire when fed to tip
Wire and tip as small as possible and as straight as possible
The frictional resistance between the part and the
I thought it could be improved. Investigation from such a viewpoint shows that Mg
About the welding wire containing the desired amount from the spool
Check the cast diameter of the wire when it is released and the strength of the wire.
Strictly stipulated in the following range,
By defining the relationship between
We arrived at the ability to adjust the curvature of the wire upon reaching.
The reasons for the definition and the range in the present invention are as follows.
You. [0018] Cast diameter: 250-550 (mm) Large cast diameter of wire when released from spool
Wire through feeder or conduit tube
Even if you get a little habit and have a habit when you
Since the wire has a small curvature when it reaches the part,
The feedability of the ear can be improved. But sp
If the cast diameter of the wire released from the
If there is, even if the proof stress of the wire is controlled as described later,
The curvature of the wire at the loop can be made sufficiently small.
Therefore, in the present invention, the casting diameter is set to 250 mm or more.
Need to be Preferably it is 280 mm or more. The diameter of the spool around which the wire is wound
Is usually about 250mm,
To reduce the casting diameter to less than 250 mm
Must be given a strong habit before winding on the spool
Must. However, wires with strong habits are wound around the spool.
Difficult to wire, resulting in wire wraps
You. This turbulence causes a decrease in wire feedability.
So, from this viewpoint, the range of the cast diameter is as described above.
Stipulated. On the other hand, the wire carrier released from the spool
Wire with a strike diameter exceeding 550 mm is wound around a spool.
Even if you are in a state where you are being spread
When the wire is sent out from the spool,
Will match each other. Therefore, the feedability of the wire is improved.
I can't. From such a viewpoint, the present invention
The diameter must be 550 mm or less. Preferably 500m
m or less. [0021] Strength of wire: 400-550 (N / mm ^Two ) To reduce the curvature of the wire when it reaches the tip
In some cases, the wire deforms before it reaches the tip
It is necessary to be good. In other words, the wire is easily deformed
If it passes through the feeding device or conduit tube,
The friction force generated when receiving force from the path is small.
The wire habit is corrected by the force received.
To reduce the curvature when the hook reaches the tip
Because you can do it. Therefore, in the present invention,
From the viewpoint, the strength of the wire was specified. When the wire contains Mg in the above range,
Means that the proof strength of the wire is 400N / mm ^Two Less than the wire
Wire is too soft and the wire
Buckling occurs in tubes, etc., impeding the improvement of feedability
Cause you to Therefore, in the present invention, the proof stress of the wire is reduced.
400 N / mm ^Two It is necessary to do above. Preferably 410N
/ Mm ^Two That is all. On the other hand, if the wire becomes too hard,
Is hardly deformed even if it is supplied to a feeding device, etc.
If the wire path is complicatedly bent, the wire
Friction with the inner wall of the
Therefore, the feedability cannot be improved. Such a viewpoint
Therefore, in the present invention, the proof strength of the wire is 550 N / mm ^Two less than
Stipulate. Preferably 460 N / mm ^Two It is as follows. Further, in the present invention, the spool is released from the spool.
Let X be the cast diameter of the wire and Y be the proof stress of the wire
In this case, it is important to satisfy the following expression (3). The following formula
(3) is obtained by the experiment described later,
Even if the wire contains the desired amount of Mg,
Cast diameter X (mm) and wire strength Y (N / mm ^Two )
Is greater than (X + 1100) / 3,
Poor balance between strike diameter and proof stress
When it reaches, the habit of the wire is not sufficiently corrected, so friction resistance
And the feedability cannot be improved. This
This causes defects such as wire fusion at the tip
Cause you to Y ≦ (X + 1100) / 3 (3) Aluminum alloy wire for welding according to the present invention
When manufacturing Mg, it is assumed that Mg is contained in the above range.
Both, the cast diameter of the wire released from the spool and
Limited if the proof strength of the wire is within the range specified in the present invention
Not done. For example, by the method shown below
Can be. The wire obtained by wire drawing is usually
Before being wound on the spool, some habit is given
However, the reason is that the wire before winding on the spool
If you have a certain habit in advance,
Because it becomes easy. Cap when released from the spool
In order to satisfy the range specified in the present invention,
Is the habit of giving the wire before it is wound on the spool
The degree can be controlled. For example, the spool diameter is 250m
If m, open the wire just before winding on the spool
The diameter of the loop formed when it is made is about 250 to 700 mm
A habit is given as follows. The reason for this is that
If the diameter is less than 250mm, it is smaller than the diameter of the spool
The wire is too strong and the wire
Because it is difficult to wind it up with good alignment
If the diameter of the loop exceeds 700 mm, the
Because the wire is much larger than the diameter, the wire has almost no habit
Because it is difficult to wind the wire around the spool
It is. Add a habit to the wire before winding it around the spool
As a means of giving, the drawn wire is spooled
Before winding, set up multiple (for example, three) rollers.
And let it pass between these rollers in a meandering way.
There is a method to adjust the pushing amount of this roller
You. The wire wound on the spool in this manner
When the wire is released, the wire has a habit
And a loop is formed (as described above,
In Ming, this loop diameter is called the “cast diameter”.
). Then, the present inventors wound the wire around the spool.
The degree of habit given to the wire before attaching and from the spool
The relationship between the open wire and the cast diameter was examined.
However, the cast diameter is affected by the strength of the wire
There was found. The proof strength is 470 N / mm ^Two Wire on spool
As a pre-winding step, formed by the habit of the wire
Wire with a habit of about 700 mm
And then wrap it around the spool.
The cast diameter when releasing the wire after tightening is 280
mm. In addition, proof strength is 520N / mm ^Two Use the wire
And wrap it around the spool under the same conditions as above,
When released from the wire, the cast diameter of the wire is 440 mm.
Was. Therefore, the wire cast released from the spool
It can be seen that the diameter is affected by the strength of the wire. As described above, in the present invention, the proof strength of the wire is
Control and release the wire from the spool.
It is important to control the diameter of the wire, but
As means for controlling, the following method can be exemplified. The proof strength of the wire depends on the composition of the wire and the strength of the wire.
Is affected by the distortion introduced when manufacturing
Therefore, if the wire is annealed before final drawing, the resistance of the wire
You can control the power. However, the component composition of the wire
Depending on the situation, the wire was annealed before final drawing
Only, the proof strength of the wire is 460-600N / mm ^Two Only to the extent
However, it was found that the wire became slightly harder. Then, as a result of the study by the present inventors, the final
The wire obtained by drawing is slightly smaller than the desired wire diameter.
(For example, about 0.5mm)
After annealing, peel off the surface of the wire and remove the desired wire.
It turned out that it should be diameter. Annealing conditions at this time
The annealing temperature is about 100 ~ 300 ℃ and the holding time is more than 1 hour
Is preferable. Conventional methods generally use wires
Not annealed, even if the wire was annealed
Even if the annealing time is often shorter than one hour,
Yield strength could not be reduced sufficiently. Also,
The knowledge of combining annealing and final processing was
It was obtained for the first time. The aluminum alloy wire for welding according to the present invention
ヤ contains Mg as an alloy component and the balance
Is basically aluminum and inevitable impurities (Zr and
V, Ag, Bi, Pb, Ga, Be, etc.)
It is preferable to contain elements such as Cr and Mn as necessary.
Good. Preferred ranges of Cr and Mn and the reasons for their definition
Is as follows. [0034] Cr: 0.01-0.5% Cr refines Al crystal grains in joints after welding
As well as to improve the joint strength by making the crystal grain size uniform.
Element to contain the effect
Is preferred. More preferably 0.05% or more
Is good. However, if its content exceeds 0.5%,
Coarse intermetallic compounds are formed after welding to reduce joint strength.
0.5% is more preferable because it may cause
A new upper limit is 0.45%. [0035] Mn: 0.01-1.2% Mn refines Al crystal grains in joints after welding
As well as to improve the joint strength by making the crystal grain size uniform.
Element that binds to Al or Fe to form Al-Fe
-Since a Mn-based compound can be produced,
The degree can be improved. To get such an effect
Is preferably 0.01% or more, more preferably 0.02% or less.
It is good to contain above. However, the content of Mn is 1.2%
If it exceeds, a huge compound is formed in the joint after welding,
The lower limit is 1.2%,
A more preferred upper limit is 1.15%. Further, Fe is contained as the inevitable impurity.
In particular, Fe should be less than 1% (including 0%)
Preferably, it is suppressed. The reasons are as follows.
You. [0037] Fe: 1% or less (including 0%) Fe is generally contained as an impurity in aluminum wires.
However, if the content exceeds 1%, the joint after welding is
Compounds tend to form in the hand, and this compound
It may cause the degree to decrease. Therefore, in the present invention, Fe-containing
Preferably, the amount is suppressed to 1% or less, more preferably
Is desirably 0.9% or less. Further, the component composition of the wire according to the present invention
Is 5000 series containing Mg, the above unavoidable
May contain Si as an impurity, but Si content
If it exceeds 1%, Mg-Si based compound will be added to the joint after welding.
And the like, which causes a reduction in the strength of the joint. Yo
The content of Si is preferably 1% or less (including 0%),
More preferably 0.9% or less (including 0%)
Is desirable. In addition to the above elements, if necessary, Cu or Z
Each element such as n, Ti, Sn, Ni, B is contained in the wire
This further increases the strength of the joint after welding.
Can be. At this time, the upper limit of the content of each element is 0.1
%, And when two or more elements are contained, the total amount is 0.
It is recommended to keep it below 2%. The aluminum alloy wire for welding according to the present invention
The consumable electrode type gas shielded arc welding method (for example,
MAG welding method or MIG welding method)
In particular, it is preferable to employ the MIG welding method. Further, the aluminum alloy for welding according to the present invention is provided.
Gold wire is used for welding various aluminum parts.
Can be used. As a material for aluminum parts
Are 3000 series (Al-Mn-Mg series) and 5000 series (Al-M
g) and 6000 (Al-Mg-Si)
Can be exemplified. Now, the present invention will be described in further detail with reference to Examples.
As will be described, the following examples are of a nature limiting the present invention.
Rather, it is not possible to change the design according to the purpose of
Both are included in the technical scope of the present invention. EXAMPLES Aluminum aluminum for welding having the component compositions shown in Table 1
Manufactures alloy alloy wire and evaluates wire feedability
did. Nos. 1 to 5 are aluminum alloy ingots (φ8
mm × 600cm), processed by die wire drawing, φ1.2mm
An aluminum alloy wire was manufactured. Nos. 6 to 13 are ingots of aluminum alloy (φ
8mm x 600cm) was processed into an original line of φ1.66mm
After annealing under the conditions shown in Table 2, the surface was ground (Table
2 is indicated as “SV”)
Gold wire was manufactured. Table 2 shows annealing temperatures as annealing conditions.
(° C.) and annealing time (h) are shown. The obtained aluminum alloy wire is shown in FIG.
And wound on a spool. In the figure, 11 is the above method
Aluminum alloy wire for welding obtained in the above, 12 is φ90m
m roller, 13 is φ120mm roller, 14 is φ80m
Roller of m, 15 shows the spool of φ250mm respectively
I have. Arrow 16 in the figure indicates the amount of roll pushing.
The arrow marked on the spool 15 indicates the rotation of the spool.
Indicates the direction. Pressing amount of rollers 12-14 respectively
The aluminum wound on the spool by adjusting
Casing when the aluminum alloy wire is released from the spool
The diameter was changed. The component analysis of the aluminum alloy wire was performed by X
Analysis by X-ray diffraction and ICP (inductively coupled plasma) emission spectrometry
did. The proof strength of the wire is measured according to JIS Z2241.
Specified. Table 2 shows the results. The aluminum alloy wound around the spool
A loop formed when the gold wire is released from the spool
The loop diameter of the loop is the cast diameter, and the cast diameter is
It was measured. Table 2 shows the measurement results. The wires shown in Table 1 were obtained by the following welding equipment.
Was welded. Aluminum 15mm thick under the following welding conditions
Bead-on welding on a metal plate (JIS Z3232 A5356 composition)
Was. The pressure by the guide roller 4 shown in FIG.
No, the setting value of the pressure roller handle is stored in memory.
And 2. <Welding device> Power supply: CPDWP350 Feeding device: "CMWH147" (trade name: manufactured by Daihen) Torch: "WTCA2501" (trade name: manufactured by Daihen) Conduit tube: "Praliner U2962M06" (product)
Name: Daihen Co., Ltd., 3m Current-carrying tip: "TIP023010" (trade name: Tokinua)
Φ1.2mmCO _Two Chips. <Welding conditions> Conditions: 220 A, 25 V Wire feed speed (bogie speed): 50 cm / min Welding time: Maximum 2 minutes Path: φ170 mm in the middle of a 3 m long conduit tube
Make one loop and use the torch with a radius of curvature of 100mm
(See FIG. 1 above) Shield gas: Ar gas, flow rate 25 L / min. Under the above conditions, only the wire was sent without welding.
Aluminum for welding when it reaches the tip when supplied
The loop diameter of the loop formed by the aluminum alloy wire is a straight ruler
Was measured. Table 2 shows the measurement results
Shown as loop diameter. In the middle of the wire feed path
Bends the conduit tube to form a φ170mm loop
Making wire feeding difficult (see Fig. 1 above).
See). At this time, it is provided at the tip of the conduit tube.
The diameter of the loop at the outlet of the
If this is the case, the friction between the wire and
Low friction resistance and stable arc welding
Have confirmed. First, whether or not the wire can be supplied as shown in Table 1 will be described.
I checked. Whether the feed is possible or not,
The test was performed without welding. The evaluation criteria are as follows:
The results are shown in Table 2. The change in wire feed speed is
Not considered. <Send / Disable> ：: The wire is ejected from the tip. X: The wire stops halfway and is not ejected from the tip.
No. The weldability of the wire depends on the chip when welding under the above conditions.
The evaluation was made based on the presence or absence of fusion at the sealing portion. The evaluation criteria are as follows
The results are shown in Table 2. <Fusibility> ：: The wire was not fused to the current-carrying chip. X: The wire was fused to the current-carrying chip.
evaluated. The evaluation criteria are as follows, and the results are shown in Table 2.
did. <Sendability> A: Wire feed speed is constant and stable arc melting
Can maintain contact ×: Wire feeding speed is unstable, and chip
Wire fusion occurred. [Table 1] [Table 2] Release the wires shown in Table 2 from the spool.
The cast diameter X (mm) and the proof strength Y (N
/ Mm ^Two 3) is plotted in FIG. In the figure, ●
Examples of the present invention, x indicates a comparative example, and a dotted line indicates Y =
It is a straight line of (X + 1100) / 3. Table 2 and Fig. 3
Can be considered as follows. Nos. 1 to 5 are ratios that do not satisfy the requirements of the present invention.
This is a comparative example. Poor balance between wire strength and cast diameter
Satisfying the relationship of the above formula (3) defined in the present invention.
Because the wire does not reach
Loop diameter is less than 400 mm, and the wire
The frictional resistance between them increases. Therefore, wire the tip
Can be fed, but the feeding speed becomes unstable,
Causes the wire to fuse to the tip due to frictional resistance
did. Therefore, wire feedability can be improved.
And a stable arc cannot be realized. Nos. 6 to 10 correspond to the present invention satisfying the requirements of the present invention.
This is a clear example. Send the wire to the tip at a constant speed.
And the loop diameter at the outlet of the energizing tip is 400
mm or more, friction between tip and wire
Low resistance. Therefore, fusion of the wire occurs during welding.
And a stable arc can be secured. Nos. 11 to 14 correspond to any of the elements according to the present invention.
This is a comparative example that does not satisfy the requirements. In No. 11, the wire was released from the spool.
When the cast diameter is outside the scope of the present invention,
The wire wrapped around the wire will diverge (spread)
I do. Therefore, the wire can be fed to the tip part.
I can't. No. 12 shows that the Mg content and the proof stress of the wire
It is outside the scope of the invention. Therefore, the wire feed path
Is bent in a complicated manner,
High frictional resistance and poor wire feedability
Was. For No. 13, the cast diameter is defined by the present invention.
Out of range, cast diameter too small
Could not be wound up in a row. Therefore, the wire feed is not uniform
And even lost supply. No. 14 shows that the Mg content and the proof stress of the wire
It is outside the scope of the invention. Therefore, Conduit Chu
Buckling occurred in the tube, and the wire could not be fed. As is clear from FIG. 3, the welding according to the present invention
Aluminum alloy wires satisfy the following formulas (1) to (3).
Because it is added, it is excellent in feedability. 250 ≦ X ≦ 550 (mm) (1) 400 ≦ Y ≦ 550 (N / mm ^Two (2) Y ≦ (X + 1100) / 3 (3) According to the above-described structure, the welding arm can be used.
It can improve the feedability of the aluminum alloy wire
As a result, wire fusion does not occur at the tip
Can provide a wire that can maintain a defined arc
Was.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of a consumable electrode type gas shielded arc welding apparatus. FIG. 2 is a process chart of winding a drawn wire around a spool. FIG. 3 is a diagram showing a relationship between a cast diameter when a wire is released from a spool and a proof stress of the wire. [Explanation of Signs] 1: Spool 2: Welding wire 3: Feeding device 4: Guide roller 5: Feeding roller 6: Conduit tube 7: Welding torch 8: Conducting tip 9: Base material 11: Aluminum alloy wire for welding 12: 90 mm roller 13: 120 mm roller 14: 80 mm roller 15: 250 mm spool 16: Roll pushing amount

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Makoto Morishita             1-5-5 Takatsukadai, Nishi-ku, Kobe             Kobe Steel, Ltd.Kobe Research Institute (72) Inventor Yasuaki Sugizaki             1-5-5 Takatsukadai, Nishi-ku, Kobe             Kobe Steel, Ltd.Kobe Research Institute (72) Inventor Hikari Haginoya             100-1 Urakawachi, Miyama-shi, Fujisawa-shi, Kanagawa             Fujisawa Plant, Kobe Steel, Ltd.

Claims (1)

Claims 1. A welding aluminum alloy wire containing 1.5 to 6% by mass of Mg, wherein a cast diameter is X, and a proof stress of the wire is Y, the following formula (1) (3) An aluminum alloy wire for welding, characterized by satisfying (3). 250 ≦ X ≦ 550 (mm) (1) 400 ≦ Y ≦ 550 (N / mm ² ) (2) Y ≦ (X + 1100) / 3 (3)