JPH10122299A - Welding method of vibration damping section member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method of a vibration damping section member capable of securing good weld penetration by way of giving no adverse effect to weldability at the welding, without lowering its damping property so much, even in case of this damping section stuck with a damping resin material on a thin aluminum plate of less than 2mm as well as enabling it to prevent any possible deterioration of bead of bead form due to an excessive weld heat input, thereby making good welding operability securable. SOLUTION: In time of welding a vibration damping section member 1 stuck with a damping resin material on an least one side of an aluminum or aluminum alloy plate 2, it is welded at a straight polarity ration ranging from 5 to 20% by an alternating current pulse MIG welding process which supplies a reverse polarity arc and a straight polarity arc alternately from the backside of a surface where damping resin material 3 of the aluminum or aluminum alloy plate 2 is stuck fast. In this connection, in this damping resin material 3, each hole 3a is formed in respective positions where plural pieces of first line rows 4 extending in the first direction and plural pieces of second line rows 5 extending in the second direction being intersected with the first direction, within the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a vibration-damping member used for railway vehicles and the like, and more particularly to a method for damping a vibration-damping resin material adhered to an aluminum or aluminum alloy plate having a thickness of 2 mm or less. The present invention relates to a method for welding a vibration-suppressed material capable of improving weldability when welding a vibration-shaped material.

[0002]

2. Description of the Related Art In recent years, in the field of railways, demands for higher speeds have been further increased, and the production and trial operation of test vehicles have begun. In order to satisfy such demands for higher running speeds, developments are being made to reduce the weight of vehicle structures (such as underframes and skeleton outer plates). It is also required to reduce noise to prevent noise. Therefore, lightweight aluminum or aluminum alloy materials are attracting attention as materials for vehicles. In particular, use of a vibration-damping and heat-insulating material in which a metal-resin-based damping material is adhered to a hollow thin-walled material surface is used for a vehicle structure. By
Noise can be reduced. Hereinafter, aluminum or an aluminum alloy is simply referred to as aluminum.

[0003] In general, the thickness of an aluminum material used for a large welded structure such as an aluminum vehicle ranges from a thick plate to a medium plate. Further, in order to reduce the weight of the vehicle structure, the aluminum material used for the outer panel and the like is reduced in thickness to about 1.5 to 2 mm. There are various methods for welding these sheet materials. For example, arc welding and resistance spot welding are used in combination. As the arc welding method, there are a TIG welding method and a MIG welding method.
IG welding is often used.

[0004] Generally, when a thin aluminum material having a thickness of less than 2 mm is subjected to MIG welding, the influence of a factor on weld bead formation is greater than that of a medium to thick steel material. Therefore, by adjusting various welding conditions, the bead shape in welding a thin aluminum material is improved. In other words, the welding position is lowered as much as possible, a copper backing material is used, the root gap is set to 0 (adhesion) using a temporary attachment or a constraint jig, and the misalignment is set to 0. It is managed with high precision, and for example, when the wire diameter is 1 to 1.
Welding using a small diameter wire of 2 mm.

[0005]

However, when the aluminum material is compared with the iron material, the aluminum material has a lower melting point because the two materials have different physical properties such as melting point, thermal conductivity and linear expansion coefficient. Nevertheless, the welding requires a large amount of heat (current) in a short time for melting. Further, in welding aluminum materials, there is a problem that welding deformation or welding cracks are easily generated.

[0006] As described above, the bead shape can be improved by changing the welding conditions of the aluminum thin plate. However, when welding the thin plate, an appropriate welding is performed as compared with the medium to thick plates. Condition range narrows. Therefore, welding defects such as poor penetration due to excessive heat input and interruption of welding due to arc penetration due to excessive heat input are likely to occur due to fluctuations in welding conditions, etc. It becomes extremely difficult as compared with the welding of a plate or a thick plate.

Further, in order to prevent noise due to speeding up of a vehicle or the like using an aluminum material, a vibration damping heat insulating material is attached to the back surface of the welded portion (for example, the inner surface of the profile). Weldability has become even more difficult. For example, the vibration damping and heat insulating material contains a hydroxide, and this hydroxide is thermally decomposed when exposed to a high temperature such as an arc to generate hydrogen. The difference between the amount of hydrogen dissolved and the amount of solid solution of the aluminum material is extremely large compared to other metals, so even when welding aluminum material without a damping and heat-insulating material, sufficient shielding properties etc. If not considered, blowhole defects due to this will occur. Therefore, in the case of an aluminum material to which a vibration damping heat insulating material is adhered, if the penetration penetrates into the heat insulating material, a large number of blow holes are frequently generated.

As described above, in arc welding of an aluminum material to which a vibration damping and heat insulating material is adhered, the heat input to welding becomes excessive, and under the condition of melting at a depth greater than the plate thickness, the resin on the back surface adversely affects welding. , The weld bead shape deteriorates. Therefore, as welding conditions, it is necessary to select conditions that inevitably suppress welding heat input, but this makes it easy for poor penetration due to insufficient welding heat input to obtain good welds. Can not be done. And this phenomenon becomes more remarkable as the plate thickness becomes thinner.

The present invention has been made in view of such a problem. Even if the vibration-damping resin material is applied to a thin aluminum plate having a thickness of 2 mm or less, the vibration-damping property is remarkably improved. It is possible to obtain good penetration without adversely affecting weldability at the time of welding without lowering, and to prevent bead shape deterioration due to excessive welding heat input. It is an object of the present invention to provide a method of welding a damping shape member capable of obtaining a shape.

[0010]

According to the present invention, there is provided a method for welding a damping shape member, comprising a damping resin material attached to at least one surface of an aluminum or aluminum alloy plate having a thickness of 2 mm or less. In the method of welding a material, the vibration damping resin material includes a plurality of first line arrays extending in a first direction;
A hole is formed at a position where the plurality of second line arrays extending in the second direction intersecting with the first direction intersect,
The positive polarity ratio is set to 5 to 50% by an AC pulse MIG welding method in which a reverse polarity arc and a positive polarity arc are alternately supplied from the back surface side of the surface of the aluminum or aluminum alloy plate material to which the vibration damping resin material is stuck. It is characterized by welding.

The plate thickness of the aluminum or aluminum alloy plate is t (mm), and the circle-equivalent diameter of the hole is D (m
m), and the pitch of the holes arranged in the first line row is P (m
m) and the interval between the first line rows is Q (mm), the circle equivalent diameter D of the hole formed in the vibration damping resin material is 1 t to 4 t (mm), and the pitch P is 2 D to 3 D ( mm), the interval Q is preferably 0.5 P to 1 P (mm), and the total area of the holes is preferably 20% or less of the area of the vibration damping resin material.

The positive polarity ratio is preferably set to 10 to 40%.

The equivalent circle diameter D refers to the diameter of the hole when the hole has a circular shape. In other cases, when the sectional area of the hole is S, 2 (S / π) ^0.5 Say. That is, when the shape of the hole is not a circle, the diameter of the circular hole having the same sectional area of the hole is referred to as a circle equivalent diameter.

In the present invention, the vibration-damping material to be welded is formed by attaching a vibration-damping resin material to at least one surface of an aluminum or aluminum alloy plate, so that the vibration-damping property of the vibration-damping material is improved. Can be. In addition, when welding the damping shape material, hydrogen gas is generated from the damping resin material due to arc heat or the like, but in the present invention, since the holes are formed in the damping resin material, the generated gas Is discharged outside through the hole without staying in the molten metal. Therefore, a weld bead having a good shape can be formed.

In the method of the present invention, an AC pulse MIG method for alternately supplying a positive polarity arc and a reverse polarity arc at the time of welding is used. This AC pulse MIG method has a characteristic that when a positive polarity arc is supplied, the penetration is shallow, the amount of melting of the wire increases, and when an opposite polarity arc is supplied, a deep penetration can be obtained. I have. Therefore, by appropriately defining the positive polarity ratio, welding conditions suitable for the plate thickness can be obtained even if the thickness of the plate material is small. As a result, it is possible to prevent the occurrence of welding defects such as poor penetration, excessive penetration and arc penetration, and it is possible to obtain a good weld bead with stable penetration.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The inventors of the present invention reduced the weight of a vehicle to increase the traveling speed of the vehicle, reduced the noise generated with the increase in the speed, and welded a vibration damping material having a small thickness. Various studies were conducted to develop a method to solve the disadvantages of the method. As a result, by forming a plurality of holes in the vibration damping material attached to the aluminum plate, it is possible to prevent the bead shape from being deteriorated due to excessive heat input, and to obtain excellent welding workability and good penetration. I found what I could do.

During welding of the damping shape member, the welded portion rises to about 150 ° C. or more due to the welding heat cycle, so that the damping resin material adhered to the aluminum plate material peels off from the aluminum plate material and the aluminum plate material and A tunnel-shaped gap is formed between the damping resin material. In the present invention, since a plurality of holes are formed in the vibration damping resin material to be attached to the aluminum plate, the gap is not in a sealed state, but is electrically connected to the outside through the hole formed in the vibration damping resin material. Is done. Therefore, when the aluminum plate is melted at a depth greater than the plate thickness due to large heat input, the molten metal reaches the vibration-damping and heat-insulating material (vibration-damping resin), whereby the vibration-damping resin is thermally decomposed. Even when hydrogen gas is generated, the hydrogen gas is released outside (in the air) from the tunnel-shaped gap through a hole. As a result, it is possible to prevent the hydrogen gas from staying in the tunnel-shaped gap and being absorbed in the molten metal, so that a good weld bead can be formed without adversely affecting the arc.

In general, when a thin aluminum plate having a thickness of 2 mm or less is subjected to MIG welding, poor welding and poor welding such as arc penetration are likely to occur due to fluctuations in welding heat input. Weldability is improved by using the AC pulse MIG method in which a positive polarity arc and a reverse polarity arc are alternately supplied. This AC pulse M
In the IG method, when a positive arc is supplied, that is, when the wire is a cathode, the penetration is shallow, the amount of melting of the wire is large, and when the opposite polarity arc is supplied, that is, when the wire is an anode, the IG method is deep. It has both properties that penetration can be obtained. Therefore, by changing the positive polarity ratio while keeping the wire feeding speed constant, the welding current fluctuates, so that the welding heat input supplied to the base material can be adjusted. As a result, by adjusting the positive polarity ratio, the amount of penetration of the base material can be optimized.

FIG. 1 is a plan view showing a vibration damping material to be welded in a welding method according to an embodiment of the present invention.
As shown in FIG. 1, the damping shape member 1 is, for example, one in which a damping resin material 3 is attached to one surface of an aluminum plate 2.
The vibration damping resin material 3 includes a first line array 4 extending in a first direction and a second line array 5 extending in a second direction intersecting the first direction. A plurality of holes are provided at the intersections.

At the time of welding the thus formed vibration damping profile 1, welding is performed under a predetermined condition from the surface opposite to the surface on which the vibration damping resin material 3 is adhered, that is, the surface on the aluminum plate 2 side. By doing so, an extremely excellent effect can be obtained. Further, as shown in this embodiment, the first line array 4 and the second
When the holes 3a are formed so that the line 5 does not intersect at right angles, there is a high probability that the welding line passes over the holes 3a regardless of the welding direction, and excellent effects can be obtained.

Further, as shown in FIG. 1, in the present invention, the circle equivalent diameter D of the hole 3a formed in the vibration damping resin
When the ranges of the pitch P of the holes 3a arranged in the line array, the interval Q between the first line arrays, and the total area of the holes 3a with respect to the area of the vibration damping resin material 3 are also defined, the ranges are stably good. Weldability can be obtained. Hereinafter, the reasons for these limitations will be described. The thickness of the aluminum plate at the portion where the vibration damping resin material is attached is defined as t (mm).

Hole equivalent diameter D: 1 t to 4 t (mm) If the circle equivalent diameter of the hole formed in the vibration-damping resin material is less than 1 t (mm), welding heat input to the plate thickness of the aluminum plate material is performed. Is too large, the damping resin material is softened and deformed due to a rise in temperature during welding, and the hole may be closed.
Then, the hydrogen gas generated by the thermal decomposition of the vibration damping resin material is released to the outside through the molten metal, not through the holes, so that welding is hindered and the bead shape is deteriorated.
On the other hand, when the circle-equivalent diameter of the hole exceeds 4t (mm), hydrogen gas is released to the outside through this hole. However, if the welding heat input becomes excessive, changes in arc force, solidification rate, etc. As a result, a large amount of molten metal flows into the hole during the solidification process of the molten metal. As a result, the bead shape on the welding back surface side becomes convex, but the molten metal is insufficient on the welding surface side (front surface side), so that it is impossible to obtain a good bead-like bead shape.
Therefore, the equivalent circle diameter D of the hole formed in the vibration damping resin material is 1 t.
It is preferable to set it to 4 to 4 t (mm). In the present invention, the shape of the hole is not limited to a perfect circle, for example,
The shape may be an ellipse, rectangle, polygon, or the like. In this case, the circle equivalent diameter of the hole indicates the diameter of a circle corresponding to the same area as the hole.

The pitch P of the holes arranged in the first line row is 2
In the welding of the D to 3D (mm) damping-shaped material, the region where the temperature of the welded portion becomes about 150 to 200 ° C. or more due to the welding heat cycle is as follows.
The area is within 20 to 30 mm from the welding center. The vibration damping resin material is attached to the aluminum plate by heat fusion using an adhesive or the like.
In a region exceeding 0 mm, the vibration damping resin material does not partly peel from the aluminum plate due to welding heat during welding. Therefore, at a position distant from the welding center, even if the pitch of the holes and the interval between the first line rows are not specified, the vibration damping property is not affected. However, if the pitch of the holes, the interval between the first line rows, the area ratio, and the like are not specified in a region within 20 to 30 mm from the welding center, under welding conditions of excessive heat input, the vicinity of the arc pole will Hydrogen gas generated from the damping resin material is prevented from being released to the outside through the holes. Therefore, the hole pitch and the like defined in the present invention originally relate to an area within 20 to 30 mm from the center of welding.

However, it is extremely difficult to set the positions of the holes in advance at the welding position of the structure before welding in consideration of the type of the structure. Further, if the position of the hole is set before welding, it is not possible to cope with a change in a welding part or addition of a reinforcing component due to welding. Furthermore, when preparing parts having holes formed at various positions corresponding to each welding site,
Manufacturing costs increase. Therefore, in the present invention, it is preferable to form holes in the vibration damping resin material at a pitch and an interval that can improve the weldability and do not reduce the vibration damping properties.

If the hole pitch P is less than 2D (mm), the holes become continuous holes, damping performance is impaired, and performance as a damping shape material is reduced. On the other hand, when the pitch P of the holes exceeds 3D, it becomes difficult to release hydrogen gas to the outside through the holes, and the weldability is impaired. Therefore, the pitch P of the holes arranged in the first line row is 2D to 3D (m
m) is preferable. The pitch P of the holes is
In the holes adjacent to each other on the first line, the distance between the centers of the holes.

The distance Q between the first line rows: 0.5P to 1P
(Mm) The interval Q between the first line rows in which the holes are formed is 0.5 P (m).
If it is less than m), the damping performance is impaired, and the performance as a damping shape material is reduced. On the other hand, the interval Q between the first line rows is 1
If it exceeds P (mm), there is a high probability that a welding line is formed between rows, that is, a region where no hole is formed, except for welding conditions of large heat input having a large welding bead width. This increases the probability that the weldability is impaired. Therefore, it is preferable that the interval Q between the first line arrays is 0.5 P to 1 P (mm). Note that the interval Q between the first line arrays refers to the distance between adjacent first line arrays.

[0027] Total area of the hole: 20% or less of the area of the damping resin material
When the total area of the prepared hole exceeds 20% of the area of the vibration damping resin material, the vibration damping property is impaired, and the performance as a vibration damping shape material is reduced. Therefore, it is preferable that the total area of the holes formed in the vibration damping resin material be 20% or less of the area of the vibration damping resin material.

Next, the welding conditions of the damping shape member having the damping resin material having the hole formed in the above range will be further described.

Positive polarity ratio: 5 to 50% When the wire feed rate is kept constant, as the positive polarity ratio increases, the welding heat input supplied to the base material decreases and the penetration of the base material decreases. Since the wire supply speed is constant, the shape of the weld bead changes from a good kamaboko shape to a convex overlap shape. The positive polarity ratio is the ratio of the time during which the positive polarity arc is supplied to one cycle time of the AC waveform of the arc generation. If the penetration of the base metal and the shape of the weld bead deteriorate, the static and dynamic characteristics of the welded joint will decrease. There is.

If the positive polarity ratio is less than 5%, the rate of decrease in welding current is small, so the decrease in welding heat input supplied to the base material is also small, and the penetration and the change in weld bead shape are small. And welding defects such as excessive penetration and arc penetration easily occur. On the other hand, when the positive polarity ratio is 5
If it exceeds 0%, the rate of decrease in the welding current increases, and the amount of decrease in the welding heat input supplied to the base material also increases. As a result, penetration of the base material is hardly obtained, and the bead shape is an overlapped and extremely fine convex shape. Therefore, in the present invention, the positive polarity ratio is set to 5 to 50%. In consideration of the penetration, the shape of the weld bead, and the workability of welding, the positive polarity ratio is preferably 10 to 40%.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the method for welding a damping profile according to the present invention will be specifically described in comparison with comparative examples.
First, a damping shape member was prepared using a damping resin material having holes formed under various conditions, and a welding test was carried out on the damping member under a constant welding condition by an AC pulse MIG method to obtain weldability and damping properties. The vibration properties were evaluated.

First, an aluminum alloy plate (A5052P)
-H34, board thickness 1.5mm, board width 250mm, length 30
0 mm) is prepared, and on one surface thereof, holes having various diameters are attached with vibration-damping and heat-insulating materials (vibration-damping resin materials) formed at various pitches and at intervals between the first line rows. Then, a damping shape member was produced. Next, the damping shape member is arranged with the surface on which the damping resin material is attached facing downward, and an aluminum alloy plate (A5052-H34, plate thickness 3 mm, plate width 5
0 mm and a length of 300 mm) were overlapped, and the two were joined by overlap fillet welding from above. In addition, A5356WY having a diameter of 1.2 mm was used as a filler material. In addition, the welding is performed by using an AC pulse MIG method in which a reverse polarity arc and a positive polarity arc are alternately supplied, and the welding current is reduced to 1%.
40A, welding voltage 22V, welding speed 2m / min,
The positive polarity ratio was 10%. And about various damping-shaped materials, the weldability and the damping property were evaluated. Table 1 below shows the conditions for forming the holes of the vibration-damping resin material affixed to these vibration-damping shapes, and Table 2 shows the evaluation results of the weldability and the vibration-damping properties.

However, in Table 1 below, the weldability was evaluated based on the bead shape, cross-sectional macro, welding workability, and the like. A sample having an undercut shape was indicated by Δ, and a sample which was not weldable was indicated by X. The damping properties were evaluated based on the damping properties and the like. The evaluation criteria were as follows: good for good, poor for slightly reduced damping but practically no problem, markedly degraded The result was indicated by x. Furthermore, regarding the comprehensive evaluation, a comprehensive judgment was made in consideration of the weldability and vibration damping properties. When a problem occurred and the vibration-damping property was remarkably reduced, and the property as a vibration-damping shape material was not satisfied, the evaluation was evaluated as x.

[0034]

[Table 1]

[0035]

[Table 2]

As shown in Tables 1 and 2, Example N
o. In Nos. 1 to 7, since the hole formation state was within the range of the present invention, it was possible to obtain a vibration damping resin material having excellent weldability and having practically no problem in damping properties.

On the other hand, in Comparative Example No. No. 8 could not be welded because the equivalent circle diameter D of the hole was less than the lower limit of the range of the present invention.
Comparative Example No. In No. 9, since the hole pitch P was less than the lower limit of the range of the present invention and the area ratio of the holes exceeded the upper limit of the range of the present invention, the bead shape became an undercut shape, and the vibration damping property was significantly reduced. Comparative Example No. In Nos. 10 and 12, since the area ratio of the holes exceeded the upper limit of the range of the present invention, the weldability was good, but the vibration damping property was significantly reduced.

In Comparative Example No. Reference numeral 11 indicates that the bead shape is undercut and the vibration control is performed because the interval Q between the first line rows is less than the lower limit of the range of the present invention and the area ratio of holes exceeds the upper limit of the range of the present invention. The properties were significantly reduced. Comparative Example No. 13 and 14 are the intervals Q between the first line rows
Was beyond the upper limit of the range of the present invention, so that welding could not be performed. Comparative Example No. In No. 15, since the hole pitch P exceeded the upper limit of the range of the present invention, the vibration damping property was good, but welding could not be performed. Comparative Example No. In No. 16, the bead shape was an undercut shape because the equivalent circle diameter of the hole exceeded the upper limit of the range of the present invention. Comparative Example No. No. 17 could not be welded because no holes were formed in the damping resin material.

As described above, the vibration-damping shape member obtained by sticking the solid vibration-damping resin material to the aluminum plate (Comparative Example No. 1)
7) becomes complete penetration due to excessive welding heat input,
Since the arc becomes unstable due to the gas (mainly hydrogen gas) generated from the vibration damping resin material, it becomes impossible to form a good weld bead. On the other hand, as shown in the present embodiment, when a hole is formed in the vibration damping resin material, even when welding is performed with excessive welding heat input, the generated gas is released into the atmosphere through the hole, so that the arc is generated. The bead shape is not deteriorated due to the instability, and welding can be performed. As a result, the range of welding conditions is expanded, and weldability is improved. However, when the equivalent circle diameter of the hole, the pitch, the interval between the first wire rows, and the like exceed a predetermined range, the effect of improving the weldability cannot be obtained, or the damping performance is significantly reduced. was there.

Next, a damping shape member was manufactured using the damping resin material having a hole formed therein within the scope of the present invention, and a welding test was carried out on the damping shape by the AC pulse MIG method at various positive polarity ratios. , Weldability and vibration damping were evaluated.

First, aluminum alloy hollow members (A6
N01S-T5, sheet thickness 1.8 mm, sheet width 500 mm, length 1000 mm) are prepared, and a damping heat insulating material (damping resin material) having holes formed on the inner surface thereof under the conditions shown in Table 3 below is attached. As a result, a damping shape member was produced. Next, an aluminum alloy plate (A6N01S-
T5, a plate thickness of 3 mm, a plate width of 50 mm, and a length of 300 mm) were overlapped, and the two were joined by overlapping and fillet welding from above. In addition, A5356WY having a diameter of 1.2 mm was used as a filler material. In addition, welding was performed by the AC pulse MIG method at various positive polarity ratios shown in Table 4 below.
The welding current and the welding voltage were set to 140 A and 22 V, respectively, and the welding speed was set to 2 m / min. The evaluation results of these weldability and vibration damping properties are also shown in Table 4 below.

However, in Table 4 below, the weldability was evaluated based on the bead shape, cross-sectional macro, welding workability, and the like. When the shape was convex or the arc was slightly unstable, it was marked with Δ, and when the blowholes were frequent and the arc became unstable, it was marked with x. The damping properties were evaluated based on the damping properties and the like. The evaluation criteria were as follows: good for good, poor for slightly reduced damping but practically no problem, markedly degraded The result was indicated by x. Furthermore, the overall evaluation was judged comprehensively in consideration of the weldability and vibration damping properties. Degraded, but those that can be welded and those whose vibration damping properties are slightly reduced but there is no practical problem are marked as △, which causes problems in weldability and markedly reduces the vibration damping properties. Those that did not satisfy the characteristics of were evaluated as x.

[0043]

[Table 3]

[0044]

[Table 4]

As shown in Tables 3 and 4 above, Example N
o. In Nos. 21 to 30, both the weldability and the vibration damping property had no practical problem. In particular, in Example No. 22 to 24
And Nos. 27 to 29, the positive polarity ratio was within the preferable range of the present invention, so that the bead shape was not deteriorated due to unstable arc, and a good weld bead was formed. In addition, there was no significant peeling of the vibration damping resin material due to welding heat, and there was no practical problem in vibration damping performance.

On the other hand, in Comparative Example No. 31 and 33 had a positive polarity ratio of 0%, that is, were welded with only a reverse polarity arc, so that the weldability was reduced. In addition, penetration burn-through occurred, and the damping resin material deteriorated. Comparative Example No. 32 and 3
4 has a positive polarity ratio exceeding the upper limit of the range of the present invention,
The weldability decreased.

[0047]

As described in detail above, according to the present invention,
Since holes are formed in the vibration-damping resin material that is attached to the aluminum plate, the vibration-damping properties are not significantly reduced, and it is possible to obtain good penetration without adversely affecting the weldability during welding. it can.

Since the AC pulse MIG method is used as the welding condition and the positive polarity ratio is appropriately defined,
Arc penetration due to excessive heat input, which is a problem when welding thin sheets, does not occur, and a weld bead with stable penetration can be formed, thereby expanding the range of welding conditions and improving welding workability. Can be improved. Furthermore, when the equivalent circle diameter of the holes formed in the vibration damping resin material, the pitch of the holes, the interval between the first line rows, the total area of the holes, and the like are appropriately defined, the weldability can be further improved. .

Therefore, according to the present invention, it is possible to easily carry out welding of a vibration damping material in which a vibration damping resin material is adhered to an aluminum alloy plate material having a thickness of 2 mm or less, which is difficult to weld by a normal MIG welding method. be able to. That is, the present invention is industrially useful and shows a remarkable effect.

[Brief description of the drawings]

FIG. 1 is a plan view showing a damping profile according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Damping shape member 2: Aluminum plate 3; Damping resin material 3a; Hole 4; 1st line row 5; 2nd line row

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI B23K 9/23 B23K 9/23 F (72) Inventor Shinichi Kinoshita 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Kobe Co., Ltd. Kobe Steel Research Laboratory (72) Inventor Mitsuo Hino 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Kobe Steel, Ltd.

Claims (3)

[Claims] 1. A method for welding a vibration-damping shape material in which a vibration-damping resin material is attached to at least one surface of an aluminum or aluminum alloy plate material having a thickness of 2 mm or less, wherein the vibration-damping resin material comprises: A hole is formed at a position where the plurality of first line arrays extending in the direction intersect with the plurality of second line arrays extending in the second direction intersecting the first direction; Welding with a positive polarity ratio of 5 to 50% by an alternating current pulse MIG welding method that alternately supplies a reverse polarity arc and a positive polarity arc from the back side of the surface of the aluminum or aluminum alloy plate material to which the vibration damping resin material is attached A method for welding a damping shape member, characterized in that: 2. The plate thickness of the aluminum or aluminum alloy plate is t (mm), and the equivalent circle diameter of the hole is D.
(Mm), and the pitch of the holes arranged in the first line row is P
(Mm) and the space between the first line rows is Q (mm), the circle equivalent diameter D of the hole formed in the vibration damping resin material is 1 t.
To 4t (mm), the pitch P is 2D to 3D (mm),
2. The method for welding a vibration damping member according to claim 1, wherein the interval Q is 0.5 P to 1 P (mm), and the total area of the holes is 20% or less of the area of the vibration damping resin material. 3. The method according to claim 1, wherein the positive polarity ratio is 10 to 40%.