JPH11347783A - Wire-shaped brazing filler metal for joining aluminum or aluminum alloy and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire-shaped brazing filler metal for joining aluminum or aluminum alloys and its manufacture, a brazing filler metal which enables proper flux feeding to a joining part and executes brazing. SOLUTION: In a hollow wire-shaped body 11 made of aluminum, a mixed powder 12 is filled, in which a powder containing at least silicon is mixed with flux, to form a wire-shaped brazing filler metal. As a result, a small diameter wire-shaped brazing filler metal capable of plastic deformation can be obtained, enabling proper flux feeding to a joining part and brazing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing wire for joining aluminum or aluminum alloy and a method for producing the same.

[0002]

2. Description of the Related Art In general, when a part (base material) made of aluminum or aluminum alloy is brazed by placing and brazing,
Set the brazing material processed into a rod shape or foil shape at the joint,
Flux is applied to the part and brazing is performed.
Therefore, after the brazing material is set, flux application is always required.

Therefore, conventionally, as shown in FIG.
A flux-joining linear brazing material in which a flux 3 is filled in a hollow linear body 2 made of aluminum or an aluminum alloy having an inner peripheral surface coated with a brazing material 1, or as shown in FIG. A material in which a flux layer 5 is adhered to the surface of a brazing material 4 (see JP-A-6-190586) is used. By using these linear brazing materials, the brazing operation can be easily performed without separately applying a flux to the joint.

[0004]

However, in the former, that is, a flux-filled wire brazing material in which a flux 3 is filled in a hollow wire 2 made of aluminum or aluminum alloy coated with a brazing material 1 on an inner peripheral surface thereof. However, since the hollow linear body is formed by a brazing sheet containing, for example, 10 to 13% by weight of silicon, there is a problem that the thickness of the hollow linear body is increased and plastic deformation is difficult.

[0005] Also, the latter, ie, the linear aluminum brazing material 4 in which the flux layer 5 is coated on the surface, contains, for example, 3 to 15% by weight of silicon.
There is a problem that plastic deformation is difficult.
There is a problem that many steps and time are required because the flux layer 5 is deposited by welding on the surface.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a linear brazing material for aluminum or aluminum alloy bonding and a method for manufacturing the same, which enable an appropriate amount of flux to be supplied to a bonding portion and uniform brazing. Things.

[0007]

In order to achieve the above object, a first aluminum or aluminum alloy joining brazing wire according to the present invention comprises silicon, zinc, and copper in a hollow wire made of aluminum. Filled with a material obtained by mixing at least silicon-containing powder and flux powder,
It is characterized by the following (claim 1).

The second brazing wire for joining aluminum or aluminum alloy according to the present invention comprises a roll of aluminum or an aluminum alloy on one or both sides of a roll-shaped foil.
A material obtained by adhering a material obtained by mixing a powder containing at least silicon of zinc and copper and a flux powder is attached (claim 2).

In the present invention, the weight ratio of the metal powder containing silicon to the flux powder is 1: 2 or more,
It is preferable that the weight ratio of the silicon powder to the aluminum metal part constituting the brazing material is 10 to 13% by weight (claim 3).

In addition, aluminum or an aluminum alloy having a magnesium content of less than 0.3% by weight can be used as the hollow wire or the roll foil.

The first method for producing a linear brazing material for joining aluminum or aluminum alloy according to the present invention is the method for producing a linear brazing material for joining aluminum or aluminum alloy according to the present invention, the method comprising: Forming a body and filling the hollow linear body with a material obtained by mixing at least a silicon-containing powder of silicon, zinc and copper with a flux powder. Item 4).

A second method for producing a linear brazing material for joining aluminum or aluminum alloy according to the present invention is a method for producing a linear brazing material for joining aluminum or aluminum alloy according to the present invention, the method comprising: A sheet material made of steel is formed into a hollow linear body by drawing, and in the process of forming the hollow linear body, a powder containing at least silicon of silicon, zinc, and copper and a flux powder are contained in the hollow linear body. Is filled with a material obtained by mixing (3).

[0013] A third method for producing a linear brazing material for joining aluminum or aluminum alloy according to the present invention is the method for producing a linear brazing material for joining aluminum or aluminum alloy according to the present invention, comprising the steps of: Coating a material obtained by mixing at least one of silicon, zinc and copper with a powder containing silicon and a flux powder on one or both surfaces of a foil made of aluminum; and forming the foil coated with the material into a roll. And a step (claim 6).

According to the linear brazing material of the present invention, the hollow wire made of aluminum is filled with a mixed powder of a powder containing at least silicon of silicon, zinc and copper and a flux powder, or Alternatively, by adhering a mixed powder of a powder containing at least silicon of silicon, zinc, and copper and a flux powder to one or both surfaces of a rolled foil made of an aluminum alloy, it is possible to supply an appropriate amount of flux to the joint and to achieve uniformity. Brazing can be enabled. In addition, since the plastic deformation of the hollow wire or the roll itself can be facilitated and the thickness can be reduced,
When joining pipes, shafts, and the like orthogonally, the brazing material can be applied uniformly.

Further, according to the method for producing a linear brazing material of the present invention, a linear brazing material in which a hollow wire is filled with a mixture of a powder containing at least silicon of silicon, zinc and copper and a flux powder. Or, on one or both sides of the roll-shaped foil,
A linear brazing material to which a mixture of a powder containing at least silicon of silicon, zinc, and copper and a flux powder can be easily formed.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First Embodiment FIG. 1 is a perspective view showing a first embodiment of a linear brazing material for aluminum or aluminum alloy joining according to the present invention, and FIG.
It is a perspective view which shows the manufacturing state of the linear brazing material of 1st Embodiment.

The aluminum or aluminum alloy joining linear brazing material (hereinafter referred to as a linear brazing material) 10 is a mixture of a powder containing at least silicon and a flux powder in a hollow part of a hollow linear body 11 made of aluminum. Powder 12
Is filled.

In this case, the hollow linear body 11 is made of an aluminum member (JIS 1000 or JIS 3000) having a magnesium (Mg) content of less than 0.3% by weight.
System) can be used. Here, the reason why the content of Mg is less than 0.3% by weight is that when Mg is contained in an aluminum member in an amount of 0.3% by weight or more, the molten flux reacts with this Mg to cause MgF2 or This is because KMgF2 is generated and the oxide film on the aluminum material surface, which is an important role of the flux, cannot be destroyed. Therefore, as a material actually used as an aluminum material having a Mg content of less than 0.3% by weight, JIS
1000 series (specifically, 1100, 1050, 107
0) or JIS 3000 series (specifically, 300
3) is used.

In this case, the metal powder containing Si and the flux powder are suspended in a dry powder or a volatile liquid such as water or alcohol to form a slurry of a mixture. In this case, the Si powder and the flux powder are 1: 2 or more,
The Si powder for the Al metal part constituting the brazing material is
The content of 0 to 13% by weight is preferable in that the brazing property can be kept good and the brazing temperature can be lowered.

The mixing ratio of the volatile liquid or the mixture in the case of suspension and the volatile liquid may be appropriately selected depending on the type of the Si powder or the volatile liquid and the application method.

It should be noted that, in the powder containing Si other than the flux powder in the mixed powder 12, an external metal powder may be added as necessary in addition to the Si powder. For example,
Corrosion resistance can be imparted by adding zinc (Zn) powder in an amount of 1.0% by weight or more and less than 3.0% by weight or copper (Cu) powder in an amount of 0.05% by weight or more and less than 0.2% by weight. That is, the Zn powder is added in an amount of 1.0% by weight or more to 3.0% by weight.
The reason for setting the content to less than 10% by weight is that Zn has the effect of lowering the potential of the brazing alloy. If the content is less than 1.0% by weight, the effect is small, and if it is more than 3.0% by weight, the potential becomes too low. This is because the corrosion of the part becomes remarkable. The reason why the content of Cu powder is set to 0.05% by weight or more and less than 0.2% by weight is as follows.
u has the effect of making the potential of the brazing alloy noble, and if it is less than 0.05% by weight, its effect is small. The reason for this is that the corrosive action also increases and is not practical.

The type of the above flux is not limited as long as it has a function of melting at a temperature of 450 ° C. or more and destroying and removing the oxide film on the aluminum surface.
-Si-based eutectic temperature around 575 ° C, that is, 560 ° C
Those exhibiting a high oxide film removing function in a temperature range of 625 ° C. are preferred. Examples of such a flux include a fluoride type, a chloride type, and a fluoride-chloride mixed type. Examples of the fluoride-based flux include KAlF4, K2Al
F5.H2O, K3AlF6, CsF, LiF, ZnF2,
KF, AlF3, K2SiF6, ZrF, KBF4, Na
A mixture of one or more of F, CaF2, BaF2, Na3AlF6 and the like can be used. Examples of chlorinated fluxes include, for example, NaCl, KCl,
LiCl, ZnCl2, BaCl2, NH4Cl, CaC
l2, AlCl3, MgCl2, MnCl2, CuCl, N
A mixture of one or more of iCl, CdCl2, SrCl2, PbCl2 and the like can be used. Further, in consideration of low melting point and fluidity, KAlF4-K2AlF5
It is preferable to use a mixed potassium salt of H2O-K3AlF6, and it is particularly preferable to mix them so that AlF3 and KF alone represent 1: 1% by weight.

Since the Si powder and the flux powder in the mixed powder 12 are melted in the brazing material, they are not particularly affected by the brazing properties, but are preferably 1 to 100 μm in consideration of the easiness of melting.

In order to manufacture the linear brazing material 10 constructed as described above, for example, as shown in FIG. 2, a hollow wire 11 made of aluminum is first formed by extrusion, and then the hollow wire is formed. Mixed powder 1 of Si powder and flux powder previously mixed at a predetermined ratio in space 11a of body 11
2 (mixture) can be filled by, for example, the supply nozzle 30 and further drawn to produce the linear brazing material 10. In this case, when the mixture is dry powder, it can be simply filled or filled by air spray.
When the mixture is in the form of a slurry, it can be filled into the hollow portion of the hollow linear body 11 by means such as spraying or insertion.

Second Embodiment FIG. 3 is a perspective view showing a second embodiment of the linear brazing material according to the present invention, and FIG. 4 is a perspective view showing an example of a production state thereof.

The second embodiment is a case in which a hollow linear body 11 is formed by rolling an aluminum foil. In this case, as shown in FIG. 4, in the process of drawing the aluminum foil 13 by a drawing machine (not shown) to form the hollow wire 11, the aluminum foil 13 is previously formed in the hollow wire 11 at a predetermined ratio. Forming the linear brazing material 10 by filling the mixed powder 12 (mixture) of the mixed metal powder containing at least Si among Si, Zn, and Cu and the flux powder by, for example, the supply nozzle 30. Can be.

FIG. 4 illustrates the case where the mixed powder 12 (mixture) of the metal powder containing Si and the flux powder is a dry powder. However, even in the case of a slurry, the hollow wire is formed by means such as spraying or dipping. It can be filled in the hollow part of the shape 11.

The other parts of the second embodiment are the same as those of the first embodiment, and the description is omitted.

Third Embodiment FIG. 5 is a perspective view showing a third embodiment of the linear brazing material according to the present invention, and FIG. 6 is a perspective view showing another linear brazing material of the third embodiment.

In the third embodiment, a roll-shaped foil 14 made of aluminum or an aluminum alloy is used in place of the hollow wire 11 in the first and second embodiments. In this case, as shown in FIG. 7A, a slurry-like mixed powder 12 (mixture) of a metal powder containing Si and a flux powder is applied to one surface of a foil 14 made of aluminum or an aluminum alloy by, for example, a spray 31. After the application, as shown in FIG. 7 (b), the foil 14 is rolled into a roll shape on the application surface side of the mixed powder 12, for example, and the linear brazing material 1 is formed.
0 can be produced.

As shown in FIG. 8A, a slurry-like mixed powder 12 (mixture) of a metal powder containing Si and a flux powder is sprayed on both sides of a foil 14 made of aluminum or an aluminum alloy, for example, by spraying. After the application by the method 31, the foil 14 is rolled into a roll shape on one application surface side as shown in FIG. 8 (b) to produce the linear brazing material 10 (see FIG. 6).

In the above description, the slurry-like mixed powder 12 (mixture) of the metal powder containing Si and the flux powder is used.
Has been described with a spray 31 or the like,
The application by the spray 31 is not necessarily required. For example, the mixed powder 12 may be applied to one or both surfaces of the foil 14 made of aluminum or an aluminum alloy by means such as dip coating or thermal spraying or vapor deposition.

When the foil 14 is formed of aluminum, similarly to the first and second embodiments, an aluminum member having a Mg content of less than 0.3% by weight (JIS 1000) is used. System or JIS 300
0) can be used.

[0035]

EXAMPLE Next, the results of observation of the brazing properties, the appearance after brazing, etc. by appropriately changing the weight ratio of the Si powder and the flux powder will be described.

(1) When the weight ratio between the Si powder and the flux powder was 1: 0.5, 1: 1, 1: 2, and 1: 3, brazing was performed to obtain a brazing property (fillet). The results shown in Table 1 were obtained as a result of observing the (formation ability) and the appearance after brazing.

[Table 1] As a result of the above experiment, when the weight ratio between the Si powder and the flux powder was 1: 0.5, brazing could not be performed, and the appearance was poor. In the case of 1: 1, brazing was possible, but as shown in FIG. 9A, the cross-sectional area of the fillet was small and non-uniform. Further, Si powder remained as a single substance in appearance, and was oxidized and turned black. On the other hand, when the ratio is 1: 2, as shown in FIG. 9B, the cross-sectional area of the fillet is large and uniform.
The brazing properties were good. The appearance was also beautifully finished. In the case of 1: 3, the brazing property is 1:
As in the case of No. 2, the cross-sectional area of the fillet was large and uniform, and the brazing property was good. In the state after brazing, an excess flux residue remained white, but there was no problem in appearance. Therefore, it was found that when the weight ratio of the Si powder to the flux powder was 1: 2 or more, the brazing properties and the appearance were good.

(2) Next, as a result of considering the weight ratio of the Si powder to the aluminum metal portion constituting the brazing material, as can be seen from the equilibrium diagram showing the relationship between the amount of added Si and the temperature shown in FIG. Optimally, the weight ratio of the Si powder to the aluminum metal part constituting the brazing material is 10% by weight or more and less than 13% by weight. The reason is that Si is 1
If the content is less than 0% by weight, the melting point rises above the brazing temperature, so that Al of the brazing material remains molten, and Si is 13% by weight.
This is because if the above is the case, the melting point rises above the brazing temperature, and the Al of the brazing material is melted and remains.

(3) Next, a specific mode of brazing using a linear brazing material will be described with reference to FIGS. 11 and 12. FIG.

Preparation of Linear Brazing Material First, a material (powder) obtained by mixing Si powder and flux powder was applied to an aluminum foil having a thickness of 10 μm and rounded into a roll to prepare a linear brazing material 10 having a diameter of 3 mm. (See FIG. 3). In this case, the weight ratio of the mixed material (mixed powder) is 1: 2 Si powder: flux powder for brazing, and the applied amount of the mixed powder is about 13 g / m2.

Next, the linear brazing material 10 was
As shown in (a), a coiled linear brazing material 10 was produced by helically winding a pipe P having a diameter equal to the diameter of a brazing portion, for example, 30 mm, at a predetermined pitch, and then extracting the pipe P from the pipe P. .

The above-mentioned coiled linear brazing material was
As shown in (b), a predetermined length, for example, one turn at a time, is cut with a nipper or the like to produce a ring-shaped brazing material 10A,
As shown in FIG. 12 (a), this ring-shaped brazing material 10A is set on a joint between a pipe 20 and a bolt 21 which are to be joined in an orthogonal manner and brazed under the following brazing conditions. Attached.

Brazing Test Brazing Conditions Brazing Atmosphere: Nitrogen Atmosphere Dew Point -40 ° C. Brazing Temperature: 600 ° C. × 3 Minutes Brazing Results The results of brazing under the above conditions are shown in FIG. As shown, the brazing material melts and fillet 2
2 was formed, and the pipe 20 and the bolt 21 were brazed firmly. Regarding the brazing state, a brazing state equivalent to that obtained by applying a ring brazing material of JIS 4045 alloy and flux coating was obtained.

The ring-shaped brazing material 10A is not necessarily manufactured by the above method. For example, a ring-shaped brazing material can be manufactured using the linear brazing material 10 in the first to third embodiments, and brazing can be performed in the same manner as described above.

[0044]

As described above, since the present invention is configured as described above, the following excellent effects can be obtained.

(1) According to the first aspect of the present invention, the aluminum hollow wire is filled with a mixture of a powder containing at least silicon of silicon, zinc and copper and a flux powder. It is possible to supply an appropriate amount of flux to the substrate and to achieve uniform brazing. Further, the plastic deformation of the hollow linear body itself can be facilitated, and the hollow linear body can be made thinner. Therefore, when joining pipes, shafts, and the like orthogonally, the brazing material can be uniformly applied. .

(2) According to the second aspect of the present invention, a mixture of a powder containing at least silicon of silicon, zinc and copper and a flux powder is coated on one or both sides of a rolled foil made of aluminum or an aluminum alloy. Since they adhere, an appropriate amount of flux can be supplied to the joint and uniform brazing can be achieved. In addition, the plastic deformation of the roll body itself can be facilitated and the roll body can be made thinner, so that when the pipes, shafts, and the like are joined orthogonally, the brazing material can be applied uniformly.

(3) According to the invention described in claims 4 and 5,
A linear brazing material in which a mixture of a powder containing silicon and a flux powder is filled in a hollow linear body can be easily produced.

(4) According to the sixth aspect of the invention, it is possible to easily prepare a linear brazing material in which a mixture of a powder containing silicon and a flux powder is adhered to one or both surfaces of a roll-shaped foil.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a linear brazing material according to the present invention.

FIG. 2 is a perspective view showing a state in which a mixture of silicon and flux is filled in a hollow linear body according to the first embodiment.

FIG. 3 is a perspective view showing a second embodiment of the linear brazing material according to the present invention.

FIG. 4 is a schematic perspective view showing a state in which a mixture of silicon and flux is filled in a hollow linear body according to a second embodiment.

FIG. 5 is a perspective view showing a third embodiment of the linear brazing material according to the present invention.

FIG. 6 is a perspective view showing another form of the third embodiment.

FIG. 7 is a schematic perspective view showing a procedure for manufacturing the linear brazing material shown in FIG.

FIG. 8 is a schematic perspective view showing a procedure for manufacturing the linear brazing material shown in FIG.

FIG. 9 is an explanatory diagram showing a brazing state when the weight ratio of the silicon powder and the flux powder in the present invention is changed.

FIG. 10 is an Al-Si binary equilibrium diagram in the present invention, showing the vicinity of the eutectic point in an enlarged manner.

FIG. 11 is an explanatory view showing a procedure for producing a ring-shaped brazing material using the linear brazing material according to the present invention.

FIG. 12 is a side view (a) of a state before brazing using the linear brazing material according to the present invention and a perspective view (b) of a state after brazing.

FIG. 13 is a perspective view showing a conventional linear brazing material.

FIG. 14 is a perspective view showing another conventional linear brazing material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Linear brazing material 10A Ring brazing material 11 Hollow linear body 12 Mixed powder of silicon and flux 13 Aluminum foil 14 Roll foil

Claims (6)

[Claims] 1. An aluminum or aluminum alloy, characterized by filling a hollow wire made of aluminum with a material obtained by mixing at least a powder containing silicon and flux powder among silicon, zinc and copper. Wire brazing material for joining. 2. A rolled foil made of aluminum or an aluminum alloy, wherein a material obtained by mixing at least one of silicon, zinc and copper with a powder containing at least silicon and a flux powder is adhered to one or both surfaces. Aluminum or aluminum alloy wire brazing material to be used. 3. The aluminum or aluminum alloy joining brazing wire according to claim 1, wherein the weight ratio of the silicon powder to the flux powder is 1: 2 or more, and A linear brazing material for aluminum or aluminum alloy joining, wherein the weight ratio of silicon powder is 10 to 13% by weight. 4. The method for producing a linear brazing material for aluminum or aluminum alloy joining according to claim 1, wherein the step of forming the hollow linear body includes the steps of: forming silicon, zinc, and copper in the hollow linear body; Filling a material obtained by mixing at least a silicon-containing powder and a flux powder among the above. 5. The method for producing a linear brazing material for joining aluminum or an aluminum alloy according to claim 1, wherein a plate material made of aluminum or an aluminum alloy is formed into a hollow linear body by drawing and the hollow wire is formed. In the process of forming the shaped body, silicon, zinc,
A method for producing a linear brazing material for joining aluminum or an aluminum alloy, comprising filling a material obtained by mixing a powder containing at least silicon and a flux powder of copper. 6. The method for producing a linear brazing material for aluminum or aluminum alloy joining according to claim 2, wherein at least one of silicon, zinc and copper is provided on one or both surfaces of the aluminum or aluminum alloy foil. A step of applying a material obtained by mixing a powder containing the powder and a flux powder, and a step of forming the foil coated with the material into a roll, The method of manufacturing the material.