KR100710810B1 - Clad aluminium alloy pipe and brazing sheet thereof - Google Patents

Abstract

The present invention can minimize or eliminate the width of the non-clad region at the welded portion, reduce the defect rate related to the bonding state in the brazing process, increase the good weldability with the connecting tubes, and burr To provide a high quality clad aluminum alloy pipe and its brazing sheet, all of which are good in hardness, hardness, pressure test pressure value and flat test value.

Clad aluminum alloy pipe of the present invention is a clad aluminum alloy selected from the clad aluminum alloy group including AL4343, AL4045, AL4N43, AL4N45; Including a core material of one kind of aluminum alloy selected from the clad aluminum alloy group including AL3003, AL3N03, AL3N33, AL3005, AL3N43, AL6951, and laminated the material (10, 10 ") and the core material 20 on one or both sides. A weld replenishment part 12, 120, 120 "of the same material as the material 10, 10" and having a thickness relatively thicker than the material 10, 10 "; Tube bodies 100, 100 ′, 100 having a tubular shape by butt welding and cutting, based on the semi-weld supplements 12a, 12b, 121, and 122 cut and formed at the weld supplements 12, 120, and 120 ″. ").

Clad, Aluminum, Alloy, Pipe, Brazing

Description

Clad aluminum alloy pipe and its brazing sheet {CLAD ALUMINIUM ALLOY PIPE AND BRAZING SHEET THEREOF}

1 is an enlarged cross-sectional view for explaining the shape of a clad aluminum alloy tube according to the prior art,

Figure 2 is an enlarged cross-sectional view for explaining the configuration of the clad aluminum alloy pipe according to the first embodiment of the present invention,

Figure 3 is a perspective view of the basic brazing sheet used in the production of the clad aluminum alloy pipe shown in FIG.

3A is a perspective view of a separate brazing sheet separated from the basic brazing sheet shown in FIG. 3, FIG.

Figure 3b is an enlarged cross-sectional view for explaining the state before welding after the tube by using the individual brazing sheet shown in Figure 3a,

Figure 3c is an enlarged cross-sectional view for explaining the post-weld state of the pipe pipe shown in Figure 3b,

4 is a perspective view of a basic brazing sheet for a clad aluminum alloy pipe according to a second embodiment of the present invention,

4A is a perspective view of an individual brazing sheet separated from the basic brazing sheet shown in FIG. 4;

Figure 4b is an enlarged cross-sectional view for explaining the state before welding after the tube by using the individual brazing sheet shown in Figure 4a,

Figure 4c is an enlarged cross-sectional view for explaining a post-weld state of the pipe pipe shown in Figure 4b,

Figure 4d is an enlarged cross-sectional view for explaining the shape of the clad aluminum alloy pipe according to the second embodiment of the present invention the cutting process of the welded pipe shown in Figure 4c,

5 is a perspective view of a basic brazing sheet for a clad aluminum alloy pipe according to a third embodiment of the present invention,

FIG. 5A is a perspective view of an individual brazing sheet separated from the basic brazing sheet shown in FIG. 5;

Figure 5b is an enlarged cross-sectional view for explaining the state before welding after the tube by using the individual brazing sheet shown in Figure 5a,

Figure 5c is an enlarged cross-sectional view for explaining the post-weld state of the pipe pipe shown in Figure 5b,

FIG. 5D is an enlarged cross-sectional view for explaining the shape of the clad aluminum alloy pipe according to the third embodiment of the present invention in which the welded pipe shown in FIG. 5C is cut.

<Description of the symbols for the main parts of the drawings>

10, 10 ": felling material 20: heartwood

12, 120, 120 ": weld replenishment 12a, 12b, 121, 122: semi weld replenishment

100, 100 ', 100 ": Tubular 200, 200', 200": Brazing sheet

The present invention relates to a clad aluminum alloy pipe and its brazing sheet, and more particularly, to precisely and quickly solve complex through-hole tube structures such as automotive multi-condensers by interconnecting pipe bodies without individual welding by brazing. It relates to a clad aluminum alloy pipe and its brazing sheet used to make it.

In general, KS D 7043 of the Korean Industrial Standards relates to aluminum alloy brazing filler metals and brazing sheets, types of aluminum alloy solder (hereinafter referred to as 'solder') and brazing sheets used for soldering. It defines the quality, dimensions and tolerances, tests and inspections, and how to label and label products.

Here, looking at the definition of the term, sheet and plate mean the thin clad aluminum alloy sheet material in the same concept.

In addition, a solder means using it independently or using it as a covering material of a brazing sheet.

In addition, the core material is the main aluminum alloy constituting the brazing sheet, which means that the solidus temperature is higher than the liquidus temperature of the solder.

In addition, a material means the solder clad on the surface of a core material.

In addition, the sacrificial cathode material means an aluminum alloy having a lower potential state than the core material, which is clad on the surface of the core material.

In addition, a cladding rate means the ratio (%) of the thickness (one side) of a workpiece with respect to the thickness of a brazing sheet.

Core material, shell material and sacrificial anode material are all classified in the form of 'aluminum alloy number'. Aluminum alloy numbers are represented by a four-digit number consisting of 'AL' and a number or letter.

The sacrificial cathode material is called under the concept of protecting the core material by sacrificing the core content of the core material by the potential difference in the relationship between the core material and the material. In the description of the present invention, the sacrificial cathode material means a clad material clad on the surface of the core material. do.

Details of the chemical composition of the core material and material (sacrificial anode material), the type of brazing sheet using the core material and the material, the type, size and tolerance of the brazing sheet, the standard dimensions of the brazing sheet, and the cladding ratio of the cladding of the material of the brazing sheet. The description is disclosed in KS D 7043 and will be omitted here.

In addition, the aluminum and aluminum alloy welded tube of KS D 6713, which is another technical standard for better understanding of the present invention, is manufactured by integrating the aforementioned brazing sheet by high frequency induction heating welding (hereinafter referred to as 'welding'). Or it is manufactured to have a tube shape.

Clad aluminum alloy tube according to the prior art, as shown in Figure 1, by using a brazing sheet cladding the material (1) on the surface of the core material 2 is welded and welded by a predetermined manufacturing apparatus in the pipe and welding process It is manufactured to have a circular tube cross-sectional shape.

As a manufacturing apparatus of a predetermined manufacturing apparatus, a strip welding machine, a looper as a tension adjusting device, an HF welding machine, a DDS cutting machine, and the like are used.

The high frequency induction heating welding apparatus includes an impeller such as a core inserted into an axis of a tube before welding, an induction coil disposed in a state spaced apart from the outer circumference of the tube, and a welding point It includes a pair of pressure rolls having semicircular grooves present on both sides with respect to the point corresponding to.

Here, the pre-welding tube is a tubular shape of a pre-cut individual brazing sheet (or plate) in advance to have a width corresponding to the circumferential length of the finished product plus the length considering the welding loss rate, It refers to an unfinished tube supplied to the high frequency induction heating welding device while maintaining the non-contact angle of inclination, that is, the non-angle angle of 4 ° to 7 ° while both ends of the width direction are rolled in a tube shape.

Looking at the cross section of the individual brazing sheet or tube tube before welding, the workpiece 1 is present throughout the core 2 surface.

However, after the high frequency induction heating, as shown in FIG. 1, the upper portion of the welded portion 3 convexly bulges in the radially outward direction of the tube as a dotted line, or the lower portion of the welded portion 3 is different from the other dotted lines. Likewise, the convex swells in the radially inner direction (axial direction).

Thereafter, the tube of the prior art is post-processed (processed to cut the swollen portion and smoothing the surface) by a DDS cutting machine to have a cross-sectional shape indicated by the solid line of FIG. 1.

Once the tube is cut, the non-clad region 3a without the workpiece 1 on top of the weld 3 extending along the axial direction of the tube with respect to the central weld line (vertical dotted line) which is difficult to visually identify. ) Exists. That is, a part of each part corresponding to the upper part and the lower part of the welding part 3 and a part of the core material are removed from the tube by the said cutting process.

The width w of the non-clad region 3a should be 2 mm or less so that it can be used as a product of a typical automotive multi-condenser, because the material 1 corresponding to the sacrificial cathode material during brazing is formed by the core material ( This is to melt at a lower temperature than 2) and to fuse with the materials of the other connecting tube (4).

Nevertheless, in practice, the non-clad region 3a may be formed by the characteristics of high frequency induction heating welding, and variables such as temperature, output power, ambient environment (air and atmospheric gas concentration), output speed and welding speed. It is difficult to uniformly adjust and form the width w, and it is difficult to mass-produce the width w of the non-clad region 3a uniformly.

For example, when the output of the high frequency induction heating welding device is simply reduced to 600㎑ or more, the welding area is relatively reduced, the welding area is heated to a high temperature, the clad balance may be broken, brittleness occurs, and the pipe characteristic value is deteriorated. A non-welded portion is generated or a problem occurs in that the material is not evenly distributed.

In addition, the tube of the prior art or the tube of the present invention to be described below has a problem that it is difficult to visually identify the width w of the welded portion 3 or the non-clad region 3a.

That is, only when using a magnification microscope or the like can accurately identify the position of the welding site 3, only a trained expert looks at the inner circumferential surface of the tube carefully for a long time and then the welding site (3) You can see where the tube is located.

Therefore, when the clad aluminum alloy tube of the prior art is used as a header pipe in an evaporator, a condenser, an automotive multi-condenser, or the like, or used as another connector, the tube is connected to the aluminum alloy connecting tube 4 as follows. Problems arise.

That is, in the tube having a solid circular cross section, a hole is drilled to insert an end of another clad aluminum alloy connecting tube 4, in which case a part of the drilled hole is welded or non-clad region 3a. When the connecting tube 4 is fitted through such a thickness of the perforated hole, the cladding 1 of the tube and the connecting material of the connecting tube 4 are melted and fused to each other through brazing. The width w of the region 3a is formed relatively wide so that both ends 1a and 1b of the workpiece 1, which are not connected on the surface of the core 2, are connected to the molten workpiece of the connecting tube 4; There is a disadvantage that it is difficult to coalesce, so that the defects that are not welded are difficult to visually identify and are uneven.

In addition, the clad aluminum alloy tube must be free from burrs, ie, peeling or jagged scratches on the edges of the cutting edges when cutting or drilling metal materials, and indicate hardness (Hv: Vickers hardness, hardness of the material surface). Index), pressure test pressure (T / S) value, and flat test value (H) relative to diameter (D) must be maintained at high quality so that it can be compared with products manufactured by general pipes. It has no shape and structural specificity.

For example, the clad aluminum alloy tubes manufactured in Japan, Germany, and the like have T / S values of 165 MPa to 170 MPa, Vickers hardness (Hv) of 47 Hv to 55 Hv, flat test value (H) of 0.45D, and decisively non-clad region (3a). ), The width (w) is about 2 mm, so that it is difficult to uniformize the product in the drilling and brazing process for manufacturing the multi-condenser, and the failure rate continues, and the amount of flux is increased or the product is brazed. All cause many problems that must be disposed of.

The present invention has been made to solve the problems of the prior art as described above, it is possible to minimize or eliminate the width of the non-clad region in the welded portion, reduce the failure rate regarding the bonding state in the brazing process, connection It is possible to provide good weldability with tubes and to provide high quality clad aluminum alloy pipes with good burr, hardness, pressure test pressure values and flat test values.

In addition, another object of the present invention is to provide a brazing sheet of a clad aluminum alloy pipe which can minimize or eliminate the width of the non-clad area even though it is welded at a high frequency induction heating welding output value for a clad aluminum alloy pipe meeting general high welding conditions. To provide.

According to the present invention for achieving the object as described above, and the material is one aluminum alloy selected from the clad aluminum alloy group including aluminum alloy number AL4343, AL4045, AL4N43, AL4N45; In a clad aluminum alloy pipe including a core material which is one kind of aluminum alloy selected from the clad aluminum alloy group including aluminum alloy numbers AL3003, AL3N03, AL3N33, AL3005, AL3N43, and AL6951, the laminate and the core are laminated on one side or both sides. A welding filler having the same material as the material and having a relatively thicker thickness than the material; It is achieved by a clad aluminum alloy pipe and its brazing sheet, characterized in that it comprises a tubular body having a tubular shape butt welded and cut on the basis of the semi-weld replenishment cut and formed at the weld refill.

In the following, preferred embodiments of the clad aluminum alloy pipe and the brazing sheet thereof according to the present invention will be described in detail with reference to the accompanying drawings.

In all embodiments of the present invention or in the following claims, the clad aluminum alloy pipe will be referred to as the first, second and third tubes, and the first and second for each of the first, second and third tubes. Preferably, each of the first, second and third pipe bodies is manufactured in the tube and the high frequency induction heating welding of the third brazing sheet.

First embodiment

2 is an enlarged cross-sectional view for explaining the configuration of the clad aluminum alloy pipe according to the first embodiment of the present invention, Figure 3 is a basic brazing sheet used in the production of the clad aluminum alloy pipe shown in FIG. 3A is a perspective view of an individual brazing sheet separated from the basic brazing sheet illustrated in FIG. 3, and FIG. 3B is a view for explaining a state before welding after being assembled using the individual brazing sheet illustrated in FIG. 3A. FIG. 3C is an enlarged cross-sectional view for explaining a post-weld state of the pipe pipe shown in FIG. 3B.

Referring to FIG. 2, the first pipe body 100 corresponding to the clad aluminum alloy pipe of the present invention has a tubular shape such as a tube and a pipe, and is clad with the material 10 on the outer surface of the core 20. It is made using the basic and individual first brazing sheets described below.

The following 2nd and 3rd pipe | tube bodies including the 1st pipe | tube 100 have a size specification of diameter 18mm-50mm, thickness 1.0mm-2.0mm, and shaft length 300mm-5500cm.

The first and second pipe bodies 10, including the first pipe 100, are selected from the group of clad aluminum alloys such as AL4343 (melting temperature: 610 ° C), AL4045, AL4N43, AL4N45, and the like. Aluminum alloy.

The core material of the second and third pipe bodies including the first pipe 100 and the following clad aluminum alloy groups such as AL3003 (melting temperature: 650 ° C), AL3N03, AL3N33, AL3005, AL3N43, AL6951, etc. It is one kind of aluminum alloy.

The first pipe 100 is a product such as a multi-condenser for automobiles can minimize the defect rate during the brazing process and has a pipe product characteristic value as shown in Table 1, which is a high quality product.

TABLE 1

Property value The present invention Comparative Example (Prior Art) Burr Very good usually Pressure test pressure (T / S) T.S. = 185 MPa T.S. = 165 MPa Vickers Hardness (Hv) M.V.H = 53 Hv M.V.H = 47 Hv Flat test value (H) H = 0.45D: very good H = 0.45D: very good Welding condition Very good usually Non Clad Area Width 0.01-1 mm 2 mm

In Table 1, M.V.H means a conventional Vickers hardness measuring instrument, and a flat test value means a measurement value of a bending test specified in a conventional aluminum and aluminum alloy weld tube (KS D 6713).

In particular, since the width of the non-clad region 31 located at the upper portion of the welded portion 30 is very narrow or not at all relative to the outer surface of the first tube 100, the first tube 100 is troubled for selecting the hole position of the connection tube. There is no need to do this, and the brazing process has a feature that can innovatively reduce the defective rate.

The first brazing sheet 200 corresponding to the group of the invention of the present invention used to complete the first tube 100 is manufactured to have a cross-sectional shape as shown in FIG. 2 when the clad plate is manufactured.

Referring to FIG. 2, the basic first brazing sheet 200 is a raw material of the first tube described above, and a single cover 10 is clad on the core 20.

Here, the upper portion of the core 20, triangular, semi-circular, semi-hexagonal, square, rectangular, semi-elliptic at the position of the equal interval (a) corresponding to the sum of the outer circumferential distance of the first tube and the distance in consideration of the shrinkage during welding , The plurality of grooves 22 are formed to extend to have a cross-sectional shape of any one of the uneven strains.

The groove 22 extends in the longitudinal direction of the first brazing sheet 100.

The upper surface of the core 20 having such a plurality of grooves 22 is clad so that the outer surface of the workpiece 10 maintains a smooth surface, and as a result, the workpiece 10 for each groove 22 of the core 20. Of filler material filled with the same material as the material having a cross-sectional shape corresponding to the groove 22 (for example, a cross-sectional shape of any one of a triangle, a semicircle, a semi-hexagon, a square, a rectangle, a semi-ellipse, and an inequality). A part 12 is hereinafter referred to as a 'welding replenishment part'.

The weld supplement 12 in the second and third embodiments, including the first embodiment, is the same as the material of the material 10 and is formed relatively thicker than the thickness of the material 10. The role of the welding supplement part 120 serves to supplement the amount of the material 10 to be removed by welding and cutting (cut off).

The intermediate portion 11 of the workpiece 10 is positioned between each weld supplement 12.

The clad rate of the basic first brazing sheet 200, that is, the thickness ratio between the material 10 and the core 20, is determined based on the middle portion 11 of the material 10. It satisfies the KS D 7043's brazing sheet specifications (eg BAS111P, BAS121P, BAS171P, BAS115P, BAS125P, etc.).

For example, the basic first brazing sheet 200 according to the first embodiment includes a material 10 having a thickness ratio of 10% as one aluminum alloy (eg AL4343) material selected from the group of clad aluminum alloys; One other aluminum alloy (for example, AL3003) material selected from the clad aluminum alloy group as the core material 20 having a thickness ratio of 90%, and the material 10 and the core material 20 at every equal interval (a). It includes a plurality of welding supplements 12 formed on the interface between.

When the basic first brazing sheet 200 is cut based on the cutting lines 40 and 41 by a predetermined cutting device, the basic first brazing sheet 200 is separated into an individual first brazing sheet 201 as illustrated in FIG. 3A.

Referring to FIG. 3A, the width of the individual first brazing sheet 201 is a value obtained by adding the outer circumferential distance of the first tube 100 (see FIG. 2) and the distance in consideration of the shrinkage rate during welding, and the like. Equivalent to the spacing a, the length of the individual first brazing sheet 201 is equivalent to the length limited by the length of a conventional clad aluminum alloy coil or the processing capacity of a looper, which is a tensioning device.

In particular, half weld supplements 12a and 12b formed by cutting the equally spaced weld supplements in half are formed on both sides of the material 10 of the individual first brazing sheet 201, respectively. do.

In addition to the first embodiment, the semi-weld replenishment portions 12a and 12b of the second and third embodiments below are made of the same material and have a relatively thick thickness.

When performing an ordinary tubing operation using the individual first brazing sheet 201 having the cross-sectional shape of FIG. 3A, the cross-sectional shape of FIG. 3B is obtained.

That is, referring to FIG. 3B, the workpiece 10 including the semi-weld replenishment portions 12a and 12b and the side surfaces 12c of both ends of the core 20 are continuously in close contact with each other while maintaining a vee angle. It is supplied to the high frequency induction heating welding device.

At this time, the impeller 51 of the high frequency induction heating welding apparatus is inserted into the inner diameter of the pipe, the induction heating coil 50 is disposed in a state spaced apart from the outer circumference of the pipe.

Thereafter, the high frequency induction heating welding apparatus performs welding within the range of 400 kW to 600 kW, so that the brittle is relatively good and the welding quality of having a solid durability is achieved. It is provided to the following second and third bodies.

On the other hand, by the operation of a pair of pressure rolls having a semi-circular groove, the first tube 100 of the present invention has a cross-sectional shape as shown in Figure 3c.

Referring to FIG. 3C, the first pipe 100 after welding has a convex portion 32 formed on the upper portion of the workpiece 10 based on the welded portion, and protrudes convexly on the lower portion of the core 20. Site 33 is formed.

The welded semi-weld replenishment portions 12a and 12b corresponding to the raised portions 32 and the convex portions 33 protruding from the cutting lines 43 and 44 as indicated by the dotted lines are used for cutting. As a result, the first tubular body 100, which is a tubular body having a uniform outer circumferential surface and an inner circumferential surface, is removed correspondingly to the outer circumferential surface and the inner circumferential surface of the pipe.

In this case, the first tube 100 is connected in the same way as the cross-sectional shape shown in FIG. 2, as the material 10 on both sides of the non-clad region 31 is very close or coalesced. There is no need to worry about the positioning of the perforation holes in the tube, and the brazing process can dramatically reduce the defective rate.

Second embodiment

The clad aluminum alloy pipe and the brazing sheet of the present invention described in this embodiment provide a second brazing sheet having weld supplements formed at equal intervals on the upper portion of the workpiece, and the pipe is piped using the second brazing sheet. Except that, the same as in the first embodiment. Therefore, the same or similar reference numerals will be given to the same or corresponding components in FIGS. 2 to 4D, and the description thereof will be omitted here.

4 is a perspective view of a basic brazing sheet for a clad aluminum alloy pipe according to a second embodiment of the present invention, and FIG. 4A is a perspective view of an individual brazing sheet separated from the basic brazing sheet shown in FIG. 4. In addition, Figure 4b is an enlarged cross-sectional view for explaining the state before welding after the individual brazing sheet shown in Figure 4a, Figure 4c is a post-weld state for explaining the welded pipe shown in Figure 4b 4D is an enlarged cross-sectional view illustrating the shape of the clad aluminum alloy pipe according to the second embodiment of the present invention in which the welded pipe shown in FIG. 4C is cut.

The basic second brazing sheet 200 ′ shown in FIG. 4 is a one-side cladding plate in which the cladding 10 and the core 20 having the same physical properties described in the first embodiment are clad.

The basic second brazing sheet 200 'is provided on the upper portion of the workpiece 10 at equal intervals corresponding to the sum of the circumferential distance of the second tube 100' (see FIG. 4D) and the distance in consideration of the shrinkage factor during welding. A plurality of welding supplements 120 having a cross-sectional shape of any one of a triangle, a semi-circle, a semi-hexagon, a rectangle, a square, a semi-elliptic, and an inequality are formed.

The basic second brazing sheet 200 'is also separately separated based on the cutting line 400 corresponding to the center of the welding supplement part 120, so that the individual second brazing sheet 201' as shown in FIG. do.

At both ends of the material 10 of the individual second brazing sheet 201 ′, semi-weld supplements 121 and 122 cut in half with the equally spaced weld supplements are projected and expressed in the thickness direction, respectively. have.

In parallel with FIG. 4B, the workpiece 10 including the semi-weld fillers 121 and 122 and the core 20 are in contact with each other continuously along the contact surface 123, and have a high frequency within the range of 400 Hz to 600 Hz. In accordance with the welding performance of the induction heating coil 50 and the impeller 51 of the induction heating welding apparatus, the tube is welded as a second pipe body 100 'after welding.

Referring to FIG. 4C, the second pipe body 100 ′ after welding is formed with a portion 320 which is poured into the components of the shell 10 on the upper and lower portions of the welding portion 310, respectively, and the components of the core 20. The convex protruding portion 330 is formed.

These portions 320 and 330 are separated from the tubular body 100 'by a cutting process, and thus have a cross-sectional shape as shown in FIG. 4D.

In the welding portion 310 of the second tubular body 100 ′ in FIG. 4D, there is no non-clad region due to the welding replenishment unlike the conventional art. In addition, the material 10 is clad over the entire circumferential surface of the core material 20 almost uniformly except for slight bending, so that the brazing processing performance is excellent and the amount of flux used during brazing processing can be minimized.

Third embodiment

In the clad aluminum alloy pipe and the brazing sheet of the present invention described in this embodiment, after forming the welding supplementary portion at regular intervals on the basic brazing sheet of the double-sided clad type, the pipe is piped by using the separate brazing sheet. The same as in the first and second embodiments except for the above. Therefore, the same or corresponding reference numerals will be given to the same or corresponding components in Figs. 2 to 5D, and the description thereof will be omitted here.

5 is a perspective view of a basic brazing sheet for clad aluminum alloy pipe according to a third embodiment of the present invention, and FIG. 5A is a perspective view of an individual brazing sheet separated from the basic brazing sheet shown in FIG. 5. In addition, Figure 5b is an enlarged cross-sectional view for explaining the pre-weld state after the tube is welded using the individual brazing sheet shown in Figure 5a, Figure 5c is a post-weld state for explaining the welded pipe shown in Figure 5b 5D is an enlarged cross-sectional view illustrating the shape of a clad aluminum alloy pipe according to a third embodiment of the present invention in which a welded pipe shown in FIG. 5C is cut.

5 and 5A to 5D, the basic third brazing sheet 200 ″ is cut based on the equal interval a described above to become an individual third brazing sheet 201 ″.

The basic third brazing sheet 200 " is a material of one type of aluminum alloy (e.g., AL4343) selected from the group of clad aluminum alloys, and has a lower material 10 having a thickness ratio of 5% to 10%; Core material 20 having a thickness ratio of 80% to 90% as one other aluminum alloy (eg AL3003) material selected by way of example from the group, and one aluminum alloy by way of example selected from clad aluminum alloy group (eg : AL4343) and clad with the upper shell 10 "having a thickness ratio of 5% to 10%, and as described above, equal intervals for making one pipe, that is, the same as in the first and second embodiments. A plurality of formed on each interface between the material (10, 10 ") and the core 20 at uniform distance intervals corresponding to the sum of the outer circumferential distance of the three-pipe (100") and the distance in consideration of the shrinkage rate during welding Welding fillers 120, 120 ".

The basic or individual third brazing sheet 201 ", 200 " is also a double-sided cladding plate in which claddings of the same material 10, 10 " and core 20 are clad with the same physical properties described in the first embodiment.

The basic 3rd brazing sheet 200 "also has weld supplements 120 and 120" formed at equal intervals.

The welding supplements 120 and 120 ″ have a cross-sectional shape of any one of a triangle, a semicircle, a semi-hexagon, a rectangle, a square, a semi-elliptic, and an inequality, which protrude to face each other based on the core material 20.

To this end, a plurality of grooves 22 and 22 ″ are formed at upper and lower portions of the core material 20 extending to have a cross-sectional shape of any one of a triangle, a semi-circle, a semi-hexagon, and a quadrangle.

The upper and lower portions of the core 20 having such a plurality of grooves 22 and 22 ″ are laminated in the form of sandwiches 10, 10 ″ so that the outer surface of the workpiece 10, 10 ″ maintains a smooth surface. As the materials 10 and 10 "are clad to each other, as a result, the materials of the materials 10 and 10" are respectively filled in the grooves 22 and 22 "of the core 20 so that the grooves 22 and 22 are filled. The weld supplements 120 and 120 " corresponding to the cross-sectional shape of "

Thereafter, in the same manner, the individual third brazing sheet 201 ″ becomes the third tube 100 ′ of FIG. 5D through the tube processing of FIG. 5B and the high frequency induction heating welding and cutting process of FIG. 5C.

Even if the third tube 100 "of FIG. 5D cuts the spilled or protruding portion of the workpiece 10, 10" based on the cutting lines 43 and 44 as indicated by the dotted lines as shown in FIG. The third tube 100 "is completed.

The first, second, and third tubular bodies 100, 100 ', and 100 "described through the drawings have a hollow circular cross section through a tubing process to form a hollow circular cross-sectional shape, but other conventional rectangular or hollow It is preferable that the tube is made to have a hollow square (rectangle, rectangle, hexagon, etc.) or hollow trapezoidal cross-sectional shape through a normal tube (tube) tube process using an unbalanced press roller.

The clad aluminum alloy pipe of the present invention has an advantage of performing a perfect brazing process as a high quality header tube such as an evaporator, a condenser, and a multi-condenser by minimizing or eliminating the width of the non-clad region at the welded portion.

In addition, in the brazing sheet of the clad aluminum alloy pipe of the present invention, a welding supplement part made of the same material as that of the material is formed at equal intervals, so that generation of the non-clad region is suppressed and the material is almost uniformly applied to the surface of the core material even when cutting. It has the effect of being able to be clad.

In addition, the clad aluminum alloy pipe of the present invention is relatively good in the state of the burr (burr) as the tube is welded without the non-clad region at the optimum high frequency induction heating output state, the pressure resistance test pressure (T / S) value This outstanding high quality product can compete with products of other countries, which can contribute to industrial and national development.

The technical idea of the clad aluminum alloy pipe and the brazing sheet thereof according to the present invention have been described above with reference to the accompanying drawings, but this is by way of example and not by way of limitation. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (8)

delete delete A material which is one aluminum alloy selected from the clad aluminum alloy group including aluminum alloy numbers AL4343, AL4045, AL4N43, and AL4N45; In the clad aluminum alloy pipe including the core material which is one kind of aluminum alloy selected from the clad aluminum alloy group including aluminum alloy number AL3003, AL3N03, AL3N33, AL3005, AL3N43, AL6951, The material 10, 10 "and the core material 20 are laminated and coalesced on one or both sides, and are the same material as the material 10, 10", and have a relatively thicker thickness than the material 10, 10 ". Weld replenishment portions 12, 120, and 120 " Tube bodies 100, 100 ′, 100 having a tubular shape by butt welding and cutting, based on the semi-weld supplements 12a, 12b, 121, and 122 cut and formed at the weld supplements 12, 120, and 120 ″. "), Including, The pipe bodies 100, 100 ', 100 "have pipe product characteristic values including a pressure test pressure (T / S) of 185 MPa, a Vickers hardness (Hv) of 53 Hv, and a width of the non-clad region 31 of 0.01 to 1 mm. Clad aluminum alloy pipe, characterized in that. The method of claim 3, Clad aluminum alloy pipe, characterized in that the tubular body (100, 100 ', 100 ") has a hollow circular, hollow square, hollow trapezoidal cross-sectional shape. A material which is one aluminum alloy selected from the clad aluminum alloy group including aluminum alloy numbers AL4343, AL4045, AL4N43, and AL4N45; In the brazing sheet (200, 200 ', 200 ") including the core material which is 1 type of aluminum alloy selected from the clad aluminum alloy group containing aluminum alloy numbers AL3003, AL3N03, AL3N33, AL3005, AL3N43, AL6951, The brazing sheets 200, 200 ', 200 "are based on an equal interval a corresponding to a value obtained by adding the outer circumferential distance of the tubular bodies 100, 100', 100" and the distance in consideration of shrinkage during welding. A plurality of weld supplements 12, 120, and 120 "formed integrally inside the core 20 or outside of the materials 10, 10" and having the same material as the materials 10, 10 ". Brazing sheet of the clad aluminum alloy pipe comprising a. The method of claim 5, The brazing sheets 200 and 200 'are one type of aluminum alloy selected from the clad aluminum alloy group and have the weld supplements 12 and 120 at equal intervals a having a thickness ratio of 10%. 10; Brazing sheet of clad aluminum alloy pipes, characterized in that the clad with a core material 20 having a thickness ratio of 90% as one other aluminum alloy material selected by way of the clad aluminum alloy group. The method of claim 5, The brazing sheet 200 " is a material of one type of aluminum alloy selected from the clad aluminum alloy group, having a thickness ratio of 5% to 10%, and forming the weld supplement 120 at equal intervals (a). (10) and a plurality of other aluminum alloy materials exemplarily selected from the clad aluminum alloy group, each having a thickness ratio of 80% to 90%, wherein the weld supplements 12, 120, and 120 ″ may be filled. Core material 20 having two grooves 22 and 22 "; and one type of aluminum alloy material selected from the clad aluminum alloy group, having a thickness ratio of 5% to 10% and matching the equal spacing. A brazing sheet of a clad aluminum alloy pipe, which is clad with an upper shell 10 " forming 120 " The method of claim 5, The weld supplement 12, 120, 120 "protrudes toward the outer side or the core 20 of the workpiece 10, 10", but in a triangle, semi-circular, semi-hexagonal, square, angular, semi-elliptic, inequality A brazing sheet of a clad aluminum alloy pipe, characterized in that formed to have any one cross-sectional shape selected.

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