JP3833937B2 - Aluminum alloy wire for welding - Google Patents

Description

【００５４】
【表２】

【００５５】
表２から明らかな様に、供試材No.1〜7は、本発明の要件を満足しているので、ワイヤの送給性が良好である。よって、安定したアークを得ることができる。また、ワイヤがチューブ内を通過する際に、ワイヤとチューブとの間に発生する摩擦力が小さいので、ワイヤが削れることはなく、チューブ内に発生するアルミニウム合金粉の量が少ない。
【００５６】
特に、供試材No.1，3，4は、ワイヤ表面の残留応力の腹側と背側のバランスが良いので、ワイヤの送給性やアーク安定性に非常に優れている。
【００５７】
一方、供試材No.8とNo.9は、本発明の要件を満足していない比較例であり、ワイヤの送給性が悪い。よって、アーク安定性にも劣る。
【００５８】
【発明の効果】
上記のような構成を採用すると、コイル状に巻かれた溶接用アルミニウム合金ワイヤの送給性を向上させることができるので、安定したアークを実現できるワイヤを提供することができた。
【図面の簡単な説明】
【図１】 消耗電極式ガスシールドアーク溶接法の一例を説明する図である。
【図２】 従来の巻き癖が付いている溶接用アルミニウム合金ワイヤを示す模式図である。
【図３】 本発明に係る溶接用アルミニウム合金ワイヤを示す模式図である。
【図４】 伸線加工で得られたワイヤに癖を付けるための一工程例である。
【符号の説明】
１：スプール ２：溶接用ワイヤ
３：送給装置 ４：ガイドローラ
５：送給ローラ ６：コンジットチューブ
７：溶接トーチ ８：通電チップ
９：母材 １０：溶接用アルミニウム合金ワイヤ
１１：ワイヤの腹側（内側） １２：ワイヤの背側（外側）
２０：ワイヤ ２１ａ〜２１ｃ：矯正ロール
２２：スプール ２３：押し込み量[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a welding aluminum alloy wire, and more particularly to a technique for improving the feedability of a welding aluminum alloy wire wound in a coil shape.
[0002]
[Prior art]
When welding aluminum and aluminum alloys used in ships and vehicles, arc welding methods (for example, TIG welding method, consumable electrode type gas shielded arc welding method, etc.) have been conventionally employed. In particular, in consumable electrode type gas shielded arc welding methods (for example, MAG welding method, MIG welding method, etc.), continuous welding is possible and widely used.
[0003]
FIG. 1 is a diagram illustrating an example of a consumable electrode type gas shielded arc welding apparatus. An aluminum alloy wire for welding (hereinafter sometimes referred to as “welding wire” or simply “wire”) 2 of about 5 to 10 kg wound around the spool 1 is provided with a guide roller 4 provided in the feeding device 3. After that, it is sent out by a push-type feeding roller 5 and sent into a welding torch (hereinafter sometimes referred to as “torch portion”) 7 connected to the end portion thereof via a flexible conduit tube 6. In the welding torch 7, a power is supplied to the wire by an energized tip (hereinafter also referred to as “tip portion”) 8, and an arc is generated between the wire tip and the base material 9. The base metal 9 is melted and dug down by the generated arc, while the wire is in the form of droplets in the shielding gas that is cut off from the atmosphere, and moves to the base material 9 side to create a molten pool. A weld is formed by solidification.
[0004]
In order to obtain a good weld when performing welding as described above, the feedability of the welding wire in the jet tube, torch, tip, etc. is an important requirement. In other words, if the feedability of the welding wire deteriorates, the wire passing speed (feeding speed) when passing through the energization tip becomes unstable, so that welding is set in advance so as to obtain a good welded portion. This is because the relationship between the current and the arc voltage cannot be maintained. Such a failure phenomenon is generally referred to as “arc instability”, and as a result, a good weld cannot be formed, resulting in poor fusion or shape failure. Furthermore, if the passage speed of the wire when passing through the energizing tip becomes unstable, the wire may be excessively energized in the tip portion and the melted wire may be fused to the tip portion.
[0005]
As an aluminum wire for arc welding with improved wire feedability, for example, Japanese Patent Application Laid-Open No. 5-277786 proposes a wire in which oil is attached to the surface of a linear welding aluminum wire. However, adding too much oil may cause new problems such as blowholes due to increased hydrogen.
[0006]
On the other hand, Al—Mg alloys (for example, JIS Z3232 A5356, A5183, A5556, A5554, etc.) are widely used as welding aluminum alloy wires, but they are softer than steel wires. It is easy to scrape with a roller, and aluminum fine powder may accumulate in the conduit tube and hinder the constant speed feeding of the wire. Therefore, the present inventors have previously proposed a wire that is difficult to be cut by a feeding roller by increasing the smoothness of the wire surface (Japanese Patent Laid-Open No. 7-32186), and has been effective. However, it is difficult to control the conditions when manufacturing this wire, and further improvements have been desired.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of such a situation, and an object of the present invention is to achieve stable arc welding by ensuring good feedability even with a wire wound in a coil shape. It is to provide an aluminum alloy wire for welding.
[0008]
[Means for Solving the Problems]
The aluminum alloy wire for welding according to the present invention that has solved the above problems is an aluminum alloy wire for welding wound in a coil shape, and the residual stress on the ventral surface of the coil winding is a tensile stress. It is preferable that the residual stress on the back surface of the coil winding is a tensile stress of 300 MPa or less.
[0009]
However, in the present invention, the “surface” is a region from the outermost surface of the wire to a depth of 100 μm.
[0010]
Moreover, it is preferable to contain Mg: 1.5-6 mass% as an alloy element of the aluminum wire for welding which concerns on this invention. As other alloy elements, Cr: 0.01 to 0.5% by mass and Mn: 0.01 to 1.2% by mass, respectively, and Fe: 1% by mass or less (including 0% by mass) If it is suppressed, it will have a further effect.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
As a result of studying from various angles to solve the above problems, the present inventors have found that the phenomenon of arc instability is
(1) When the conduit tube (feeding route) is long,
(2) If the conduit tube is bent strongly in the vicinity of the welding torch,
(3) If the diameter of the conduit tube is small,
(4) When welding continuously for a long time,
I knew that it was noticeable. And even in these cases, further investigations were made with the aim of realizing an aluminum alloy wire for welding capable of realizing stable arc welding by improving the wire feedability. As a result, the inventors have found that the above problems can be solved brilliantly by controlling the surface residual stress of the welding wire wound in a coil shape, and the present invention has been completed. Hereinafter, the function and effect of the present invention will be described.
[0012]
When the cause of arc instability in particular was examined in the above case, it was found that the cause was in the hook attached to the welding wire. That is, as described above, the welding wire is generally wound on a spool, but at this time, the welding wire is plastically deformed and has a “curl”. When the welding wire with curl passes through the conduit tube, a frictional force is generated between the welding wire and the inner wall of the conduit tube. Therefore, the longer the feed path, the greater the frictional force. As a result, the feeding speed becomes unstable, and the arc generation becomes unstable. Also, when the conduit tube is strongly bent in the middle of the path, or when the conduit tube is bundled with a small diameter, it is plastically deformed when the welding wire passes through these tubes. May be attached. Furthermore, when a wire wound on one spool is used for continuous welding for a long time, the winding diameter of the welding wire wound on the spool gradually decreases. Will also become prominent.
[0013]
The reason why the welding wire is wound around the spool is that welding is facilitated by attaching a certain amount of curl to the wire. FIG. 2 shows a schematic diagram of a conventional welding aluminum alloy wire with curl. In the figure, 10 is an aluminum alloy wire for welding when released from the spool, 11 is a ventral side (inside) of the wire, and 12 is a back side (outside) of the wire. Further, arrows 13 and 14 written on the wire 10 indicate a residual stress in the compression direction 13 on the wire surface (hereinafter sometimes referred to as “compressive stress”) and a residual stress in the tensile direction 14 on the wire surface (hereinafter referred to as “ Each may be referred to as “tensile stress”.
[0014]
As shown in FIG. 2, in the conventional welding aluminum alloy wire with a curl, the residual stress on the abdomen side 11 surface of the wire 10 is in the compression direction 13, and the residual stress on the back side 12 surface of the wire 10 is The tensile direction is 14. The curl is generated by the stress difference between the ventral side and the back side of the wire, and the curl becomes strong when the stress difference is large. When welding with such a wire with strong curl, even if the wire is fed to a feeding device or a jet tube, the wrinkle attached to the wire is difficult to repair, so there is a frictional force between the tube and the wire. appear. This frictional force affects the wire feedability.
[0015]
The inventors of the present invention can provide a stable arc with good feedability if the wire is difficult to be attached with “winding hooks” and “hooks” or if the “winding hooks” and “hooks” attached to the wires are easy to repair. We examined it under the idea that it could be realized. Then, the present inventors have clarified that in order to realize such a wire, the residual stress on the ventral surface of the aluminum alloy wire for welding wound in a coil shape may be a tensile stress. . This will be described with reference to the drawings.
[0016]
FIG. 3 is a schematic view of an aluminum alloy wire for welding according to the present invention, and portions corresponding to those in FIG. As shown in FIG. 3, if the stress remaining on the surface of the ventral side 11 of the welding wire is in the tensile direction 14, when the wire wound in a coil shape is sent to the feeding device, it is wound around the wire itself. Since the force to correct the wrinkle works, the force applied to the wire to fix the curl can be small. In addition, since the wire itself has a function of correcting the wrinkles, even if the wires pass through the tube or the like and become wrinkled, they are easily fixed. Therefore, the curl and wrinkle can be easily repaired, so that the wire feedability can be improved and a stable arc can be realized. In the present invention, the “surface” of the wire is a region from the outermost surface of the wire to a depth of 100 μm.
[0017]
In the present invention, if the residual stress on the surface on the ventral side (that is, the inner side when coiled) when the wire is coiled is a tensile stress, the magnitude is not particularly limited, but the wire feedability is reduced. From the viewpoint of improvement, it is preferably 5 MPa or more, more preferably 10 MPa or more. However, if the tensile stress is too large, it is difficult to wind the wire in a coil shape, so the upper limit is preferably about 300 MPa.
[0018]
On the other hand, when a wire is wound in a coil shape, the residual stress on the back surface of the wire generally becomes a stress in the tensile direction, but when correcting such winding of the wire, there is at least a force of the residual stress on the back surface. Necessary. Therefore, if the residual stress on the back surface when the wire is wound in a coil shape is made as small as possible, the wrinkles attached to the wire can be easily repaired. In the present invention, the tensile stress on the back surface of the coil winding is preferably 300 MPa or less, more preferably 290 MPa or less. The lower limit is not particularly limited, but if the tensile stress on the back surface is made extremely low, it becomes difficult to control the tensile stress remaining on the ventral surface, so the residual stress on the back surface of the wire The lower limit of is not 0 MPa, preferably 5 MPa, more preferably 10 MPa.
[0019]
The component composition of the aluminum alloy wire for welding according to the present invention is not particularly limited, and consists of an aluminum alloy containing various elements and unavoidable impurities (Zr, V, Ag, Bi, Pb, Ga, etc.). From the viewpoint of securing the strength of the joint portion, it is preferable to contain Mg as an alloy element. The preferred range when Mg is contained and the reasons for its definition are as follows.
[0020]
Mg: 1.5 ~ 6% (. Meaning of the "% by weight" hereinafter the same)
Mg is an element that causes solid solution strengthening at the joint after welding and increases the strength of the joint. In order to obtain such an effect, Mg is preferably contained in an amount of 1.5% or more, more preferably 1.6% or more. However, if it is excessively contained, cracks are likely to occur when the wire is drawn, so the content is preferably 6% or less, more preferably 5.8% or less.
[0021]
Moreover, it is preferable to contain Cr and Mn as other alloy elements as required, and to suppress Fe to 1% or less. The preferred range of Cr and Mn, the reason for their definition, and the reason for suppressing the Fe content are as follows.
[0022]
Cr: 0.01 ~ 0.5%
Cr is an element that refines the Al crystal grains in the joint after welding and improves the joint strength by making the crystal grain size uniform. To obtain the effect, Cr is preferably contained in an amount of 0.01% or more. . More preferably it is 0.02% or more. However, if the content exceeds 0.5%, a coarse intermetallic compound is formed after welding and causes a reduction in joint strength. Therefore, the content is preferably 0.5% or less, more preferably 0.45% or less.
[0023]
Mn: 0.01 to 1.2 %
Mn is an element that refines Al crystal grains in the joint after welding and improves the joint strength by making the crystal grain size uniform, and is bonded to Al and Fe to form an Al-Fe-Mn system. Thus, the joint strength can be improved. In order to obtain such an effect, the content is preferably 0.01% or more, more preferably 0.02% or more. However, if the Mn content exceeds 1.2%, a large compound is formed in the joint after welding and causes a decrease in strength. Therefore, the content is preferably 1.2% or less, more preferably 1.15% or less. .
[0024]
Fe: 1 % or less ( including 0 %)
Fe is generally contained as an impurity in the aluminum wire, but if its content exceeds 1%, a compound tends to be formed in the joint part after welding, and this compound causes the joint strength to decrease. . Therefore, in the present invention, the Fe content is preferably suppressed to 1% or less, and more preferably 0.9% or less.
[0025]
In the present invention, for example, if a welding wire containing Mg and the component composition is 5000, Si may be contained as an impurity element as an element other than Mg, Cr, Mn, and Fe. However, if the Si content exceeds 1%, an Mg-Si compound or the like is generated in the joint portion after welding and causes the strength of the joint portion to decrease, so the Si content is preferably 1%. In the following, it is desirable to suppress it to 0.9% or less.
[0026]
Furthermore, it is preferable that elements other than the above, such as Cu, Zn, Ti, Sn, Ni, and B, be included in the wire as necessary, because the strength at the joint after welding can be further increased. The upper limit of the content of each element is 0.1%, and when two or more elements are contained, the total amount is recommended to be 0.2% or less.
[0027]
When manufacturing a conventional aluminum alloy wire for welding, it is obtained by wire drawing in order to prevent the wire from spreading too much when the wire wound on the spool is released or to facilitate handling of the wire. In general, a strong winding rod is preliminarily attached to the formed wire and then wound on a spool. For example, when winding the wire around the spool, use a straightening roll so that the diameter of the loop formed when the wire is naturally released is smaller than the diameter of the spool. There are a method of winding a wire after winding a wire and a method of increasing the tension when winding the wire on the spool. However, in such a conventional method, the residual stress on the ventral surface of the coil winding is a compressive stress as shown in FIG.
[0028]
On the other hand, the aluminum alloy wire for welding according to the present invention needs to be manufactured so that the residual stress on the ventral surface of the coil winding becomes a tensile stress, but the specific method is not particularly limited. For example, the method shown below is mentioned.
[0029]
When the aluminum alloy wire for welding according to the present invention is manufactured by roll drawing, the reduction ratio (area reduction rate) in the drawing process may be controlled. Specifically, the area reduction rate of the final wire drawing pass is set to about 10 to 15%, and it may be slightly lower than the area reduction rate of the final wire drawing pass when manufactured by die drawing as in the prior art.
[0030]
Further, when the aluminum alloy wire for welding according to the present invention is manufactured by die drawing, the area reduction rate and the die angle may be controlled. Specifically, the area reduction rate of the final drawing pass is set to about 5 to 15%, which is slightly lower than the area reduction rate of the final drawing pass in the conventional die drawing, and the die angle is 10 to 20 °. It may be on the low angle side.
[0031]
Furthermore, in the present invention, as before, before the wire obtained by wire drawing is wound around the spool, the wire is pre-curved using a straightening roll. Or it is preferable to attach a strong wrinkle to the wire obtained by die drawing. The process of attaching a wire to a wire will be specifically described with reference to the drawings.
[0032]
FIG. 4 is a diagram showing an example of a process for attaching a wrinkle to a wire obtained by wire drawing. In the figure, 20 is an aluminum alloy wire obtained by wire drawing (that is, the above-described roll wire drawing or die wire drawing), 21a to 21c are straightening rolls, and 22 is a spool. In addition, an arrow 23 in the figure indicates the pushing amount of the correction roll. An arrow written on the spool 22 indicates the rotation direction of the spool.
[0033]
The wire 20 obtained by the wire drawing process is wrinkled by meandering and passing between three straightening rolls provided as shown in FIG. Then, the wire 20 with the hooks is wound around the spool. In the present invention, the strength of the wrinkles can be changed by increasing the pushing amount 23 of the straightening rolls (for example, 21b and 21c). Specifically, the roll push-in amount 23 is set to 1.5 mm or more, and may be slightly larger than the roll push-in amount with the conventional straightening roll (previously about 1 mm or less).
[0034]
An example of a method for measuring the residual stress on the wire surface is a method using an X-ray diffractometer. The measurement principle is, for example, “X-ray stress measurement method”, (1981), edited by the Japan Society of Materials Science, Yokendo, “X-ray stress measurement method standard”, (1982), Japan Society of Materials Science It is described in the meeting. Specific measurement conditions will be described in detail in the following examples.
[0035]
The diameter of the aluminum alloy wire for welding according to the present invention is not particularly limited, but a wire having a wire diameter of about φ0.8 to 3 mm is usually wound around a coil.
[0036]
The aluminum alloy wire for welding according to the present invention is preferably used in a consumable electrode type gas shielded arc welding method (for example, MAG welding method, MIG welding method, etc.), and particularly preferably employed in the MIG welding method.
[0037]
The aluminum alloy wire for welding according to the present invention can be used when welding various aluminum members. Examples of the material of the aluminum member include known materials such as 3000 series (Al-Mn-Mg series), 5000 series (Al-Mg series), and 6000 series (Al-Mg-Si series).
[0038]
Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are not intended to limit the present invention, and any design changes in accordance with the gist of the preceding and following descriptions are technical aspects of the present invention. It is included in the range.
[0039]
【Example】
The aluminum alloy ingot (φ150 × 4000mm) having the composition shown in A5356 of JIS Z3232 is subjected to homogenization treatment (540 ° C, 4 hours) and hot-rolled at 490 ° C to have a diameter of about 5 to 20mm. Wire was used. After this wire was cold-drawn, the surface of the wire was peeled to obtain a wire original wire having a diameter of about 3 to 7 mm, and this original wire was processed into a wire material having a diameter of 1.2 mm by roll drawing or die drawing.
[0040]
In the roll wire drawing, the residual stress on the wire surface was controlled by appropriately changing the area reduction ratio in the final wire drawing pass, the roll push amount before winding the wire on the spool (see FIG. 4), and the winding setting.
[0041]
In die drawing, the residual stress on the wire surface is reduced by appropriately changing the area reduction ratio, die angle, roll push amount before winding the wire on the spool (see FIG. 4) and winding setting in the final drawing pass. Controlled.
[0042]
The wire obtained by roll drawing or die drawing was wound around one of the following ACs having different spool diameters. This is a test material (aluminum alloy wire for welding).
[0043]
<Rewind setting>
A: Strong (Spool diameter: φ250mm)
B: Medium (Spool diameter: φ300mm)
C: Weak (Spool diameter: 350mm)
[0044]
Table 1 shows the wire drawing method, the area reduction rate (%), the die angle (°), the winding setting, and the roll push-in amount in the final wire drawing pass. Further, the residual stress on the surface of the specimen (wire) is measured using the following apparatus. The measurement positions were performed on the outermost surface 15 on the ventral side 15 and the back side 16 of the test material shown in FIG. 3, and the measurement results are shown in Table 2. The residual stress (tensile stress) in the tensile direction is indicated by “+”, and the residual stress (compressive stress) in the compression direction is indicated by “−”.
[0045]
<Measurement of residual stress>
[measuring device]
“PSPC micro-part X-ray stress measurement device” (trade name: manufactured by Rigaku Corporation)
[Measurement condition]
Characteristic X-ray: Cr-kα
Filter: V
X-ray beam diameter: φ0.5mm
Tube voltage: 40 kV
Tube current: 30mA
Diffraction surface: Al (311)
Diffraction angle: 139.3 degrees Measurement method: Tilt method Measurement direction: Axial stress constant: -165.78 MPa / deg
Irradiation time: 200 seconds Measurement site: Outermost surface ψ angle on the ventral side and back side of the wire: 0 °, 10 °, 20 °, 30 °, 40 °, 45 °
The feedability, feed resistance, arc stability, and stable arc duration when the test materials shown in Table 1 were welded by the welding apparatus shown below were examined. The results are shown in Table 2.
[0046]
<Welding equipment>
Power supply: CPDWP350
Feeder: “CMWH147” (trade name: manufactured by Daihen)
Torch: “WTCA2501” (trade name: manufactured by Daihen)
Conduit tube: "Plaliner U2962M06" (trade name: manufactured by Daihen), 3m
Tip: “TIP023010” (trade name: manufactured by Tokin Arc) φ1.2 mm CO ₂ tip.
[0047]
<Welding conditions>
Conditions: 220A, 25V
Wire feed speed: 50cm / min
Welding time: Maximum 2 minutes Path: One loop of φ170 mm was made in the middle of a conduit tube with a total length of 3 m, and bent to a radius of curvature of 100 mm just above the torch (see FIG. 1 above).
[0048]
<Feedability>
The feedability was evaluated by measuring the resistance when the wire was fed from the feeding device of FIG. 1 during welding. Evaluation criteria at this time are as follows: ◎: Feeding resistance value is 80 N or less and fluctuation of feeding resistance value is small, ◯: Feeding resistance value is small and good, △: Occasionally feeding resistance value fluctuates, ×: Resistance value Is bad.
[0049]
<Arc stability>
Arc stability was evaluated by variation of welding current and arc voltage during welding. The evaluation at this time is ◎: small fluctuations in welding current and arc voltage and good weld bead shape, ◯: small fluctuations in welding current and arc voltage, Δ: occasional fluctuation, x: bad.
[0050]
<Stable arc duration>
Arc welding was performed for a maximum of 2 minutes to check for chip fusion.
[0051]
After welding under the conditions shown below, the amount of aluminum alloy powder deposited in the conduit was measured.
[0052]
<Aluminum alloy powder amount>
Welding conditions: 170 A, 22 to 23 V, feed rate: 50 cm / min. After welding, the aluminum alloy powder deposited in the conduit was collected on a filter paper while flowing with a solvent, and the amount of aluminum alloy powder generated was compared. However, since the welding time differs depending on the test material, Table 2 shows values converted into the amount of aluminum alloy powder generated in 5 minutes.
[0053]
[Table 1]

[0054]
[Table 2]

[0055]
As is apparent from Table 2, since the test materials No. 1 to 7 satisfy the requirements of the present invention, the wire feedability is good. Therefore, a stable arc can be obtained. Further, since the frictional force generated between the wire and the tube when the wire passes through the tube is small, the wire is not scraped and the amount of aluminum alloy powder generated in the tube is small.
[0056]
In particular, specimens Nos. 1, 3, and 4 are excellent in wire feedability and arc stability because the balance between the ventral side and the back side of the residual stress on the wire surface is good.
[0057]
On the other hand, sample materials No. 8 and No. 9 are comparative examples that do not satisfy the requirements of the present invention, and have poor wire feedability. Therefore, the arc stability is also poor.
[0058]
【The invention's effect】
By adopting the above configuration, it is possible to improve the feedability of the aluminum alloy wire for welding wound in a coil shape, and thus it is possible to provide a wire that can realize a stable arc.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of a consumable electrode type gas shielded arc welding method.
FIG. 2 is a schematic view showing a conventional aluminum alloy wire for welding with a winding rod.
FIG. 3 is a schematic view showing an aluminum alloy wire for welding according to the present invention.
FIG. 4 is an example of a process for attaching a wire to a wire obtained by wire drawing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1: Spool 2: Wire for welding 3: Feeding device 4: Guide roller 5: Feeding roller 6: Conduit tube 7: Welding torch 8: Current supply tip 9: Base material 10: Aluminum alloy wire for welding 11: Abdominal wire Side (inside) 12: Back side of wire (outside)
20: Wire 21a-21c: Straightening roll 22: Spool 23: Push-in amount

Claims (4)

An aluminum alloy wire for welding wound in a coil shape,
An aluminum alloy wire for welding, wherein the residual stress on the ventral surface of the coil winding is a tensile stress. The aluminum alloy wire for welding according to claim 1, wherein the residual stress on the back surface of the coil winding is a tensile stress of 300 MPa or less. The aluminum alloy wire for welding according to claim 1 or 2, which contains Mg: 1.5 to 6 mass% as an alloy element. As other alloy elements, Cr: 0.01 to 0.5% by mass and Mn: 0.01 to 1.2% by mass, respectively, and Fe: 1% by mass or less (including 0% by mass) The aluminum alloy wire for welding according to claim 1, wherein the aluminum alloy wire is welded.

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