JPH06155030A - Joined clad plate and its manufacture - Google Patents

Abstract

PURPOSE:To obtain the joined clad plate where functions and characteristics which base plate material and material to be clad have respectively are not marred by allowing the same materials to abut on each other, welding only high melting point side material and further, welding low melting point side material. CONSTITUTION:A butt part 8 of the high melting point material 4 is irradiated with a laser beam and welded up to the depth (d). At this time, since the beam is narrowed down finely and the butt part 8 can be welded when laser beam welding is used, a value of (a) of a bead part 6 becomes smaller desirably. The butt part 8 of the low melting point material 5 is then welded up to the depth (d') by laser beam welding. A value of (a') of a bead part 7 also becomes smaller in the same way in this case. Consequently, cladding is attained in the bead parts 6 and 7 and the whole joined clad plate 1 after welding including the bead parts 6 and 7 holds various properties which the clad plate has before welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonded clad plate in which the thickness end faces of the clad plates are welded by abutting the same materials with each other, and a manufacturing method thereof. The present invention relates to a bonded clad plate capable of forming a member having a complicated shape or an extremely large size according to various uses, and a manufacturing method thereof.

[0002]

2. Description of the Related Art In order to realize various properties that cannot be expected with a single metal or alloy plate as it has been, it is possible to obtain various properties having necessary electrical properties, magnetic properties, thermal properties, mechanical properties, and chemical properties. Various clad plates have been proposed in which metal and alloy plates are selected and combined according to the required functions and characteristics and laminated and integrated. That is, since it has electrical properties, magnetic properties, thermal properties, mechanical properties, chemical properties, etc. possessed by individual metals and alloys constituting the clad plate, or has various properties due to their synergistic effect, It is often used for applications requiring properties and characteristics that cannot be expected with a single metal or alloy, for example, for electronic parts such as bimetals and heat sink materials (heat spreader materials) used in semiconductor devices.

Further, it is used for various structures such as vibration control structural materials, soundproof structural materials, various chemical plants (for internal corrosion resistance), waterfront structures (for external corrosion resistance), and various pipes. It has also been applied to applications. For example, in the case of using a clad plate for a separator part of a fuel cell device, which has been attracting attention as a new power generation device in recent years,
A clad plate having a large size according to the fuel cell device and having a complicated shape such as a rectangular frame shape is required.

Generally, a clad plate is manufactured by pressing a plurality of different metal materials such as metals and alloys into a plate shape. For example, in order to obtain the above-mentioned electronic component material, the plate-shaped clad plate is used. It is processed into the required shape by press punching or bending. However, although the length and thickness of the clad plate can be arbitrarily adjusted, the width of the clad plate is limited by the size of the rolling apparatus that manufactures the material, and the size of the pressure welding apparatus itself is also limited.

When a clad plate made of various materials is used for various purposes, the clad plate can be simply pressed to obtain a complex shape such as a rectangular frame, but the width of the clad plate is limited. Therefore, it is impossible to obtain a dimension larger than the width of the clad plate, and even if a wide clad plate corresponding to the size can be obtained, there is a problem that the product yield due to press punching is extremely poor. Therefore, in order to obtain a clad plate that can cope with an extremely large dimensional shape that exceeds the production limit of the clad plate and a three-dimensionally or two-dimensionally complicated shape, it is necessary to join the clad plates by means such as welding.

[0006]

However, conventionally known welding methods such as gas welding, friction pressure welding,
In thermite welding, electric resistance welding, brazing, impact welding, flash butt welding, etc., as shown in FIG. As shown in B, the end faces of each metal-based material are butted against each other, and the butted faces are melted and joined together. Also, as shown in C of FIG. Since it is based on a means of interposing a material and melting the different materials to weld a metal-based material, various properties of the bonded clad plate at the welded portion where the thickness end faces of the bonded clad plate are butted against each other and welded together. It was an unsuitable method for welding while maintaining the properties.

That is, as described above, the clad material has various properties such as electrical properties, magnetic properties, thermal properties, mechanical properties, chemical properties, and synergistic properties of the respective pressure-bonded metal materials. Because it is characterized by having both,
It is desirable to maintain the above-mentioned properties even in the clad plate joined together after welding. However, in the conventional welding method, since the planes of the clad plates 10 and 11 are overlapped and welded to each other as shown in FIG.
11 has a step difference, and various properties of the clad plate are interrupted at the step difference portion. Further, as shown in B of FIG. 3 and C of FIG. 3, the entire butted portion is melted and welded, or a different material is used. No consideration is given to joining while maintaining the various properties of the individual metals or alloys forming the clad plates 10 and 11 such as those that intervene to further melt the whole. Therefore, in the conventional welding method, various properties of the clad materials 10 and 11 are changed or disappeared by the interposition of the fusion zone 12 and the dissimilar material 13, and the properties, characteristics and functions of the welded joined clad plate as a whole. However, there is a problem that quality and the like are impaired.

In addition to the above welding methods, there are welding methods such as fuse arc welding, submerged melt welding, and metal arc welding. However, these welding methods must use a welding rod 14 made of a predetermined component. Because it does not happen,
As indicated by D, the elemental components other than the materials of the clad plates 10 and 11 are mixed in the welded portion 12, and there is a problem that various characteristics of the joined clad plate after welding are impaired as in the above welding method.

As described above, it has not been possible to obtain a bonded clad plate that retains the characteristics of each clad plate at the welded portion where the thickness end faces of the clad plates are abutted against each other and welded. The present invention is a welding portion in which clad plates to which a plurality of different kinds of metal materials are pressure-welded are welded by abutting the same materials at their thickness end faces, while welding while maintaining various characteristics of each clad plate, and various applications. It is an object of the present invention to provide a bonded clad plate that can cope with the formation of a member having a complicated shape or an extremely large size according to the above, and a manufacturing method thereof.

[0010]

DISCLOSURE OF THE INVENTION The present invention relates to a clad plate in which at least one surface of a substrate material made of a metal or an alloy is pressure-welded with an adherend made of a metal or an alloy having a melting point different from that of the substrate, and the clad plate. A clad plate having the same structure as that of 1. and a welded clad plate in which the end faces of the clad plates are abutted and welded so that the same materials come into contact with each other. And the function and characteristics of the adjoining substrate material and the adhering material are not impaired, respectively.

Further, according to the present invention, a clad plate in which at least one surface of a substrate material made of a metal or an alloy is pressure-bonded with an adherend made of a metal or an alloy having a melting point different from that of the substrate, and the clad plate has the same structure. After the end faces of the clad plates are abutted against each other so that the same materials come into contact with each other, and only the high melting point side material is welded from the abutting portion of the surface of the high melting point material side, Welding the low melting point side material from the butted part of the surface, there is substantially no melting of the substrate material and the adherend material at the welded part, and the functions and characteristics of the adjacent substrate material and adherend material are impaired A method for manufacturing a bonded clad plate, which is characterized in that a bonded clad plate that does not exist is obtained.

[0012]

According to the present invention, a clad plate having a two-layer structure or a multi-layer structure, in which an adhering material made of a metal or an alloy having a melting point different from that of the substrate material is pressed onto a surface of a substrate material made of a metal or alloy, has the same constitution. The end faces of the clad plates are abutted against each other so that the same materials come into contact with each other. First, the abutting part on the surface of the material with a high melting point is laser welded, electron beam welded, ion beam welded, TIG, MIG, etc. By welding only the high melting point side material by the welding means, and by welding the low melting point side material by the similar welding means at the abutting portion of the surface of the material side having a lower melting point, various properties of the clad plate before welding, For example, electrical properties (resistance value, etc.), magnetic properties (magnetic property, etc.), thermal properties (thermal expansion, heat conduction, etc.), mechanical properties (strength, elasticity, etc.) Chemical properties (corrosion resistance, oxidation resistance,
Solvent resistance, etc.) can be maintained in the welded portion (hereinafter referred to as the bead portion) without losing or changing various properties thereof, and can be retained over the entire bonded clad plate after welding. That is, it is possible to obtain a bonded clad plate in which the substrate material and the adherend material are substantially not melted in the welded portion and the functions and characteristics of the adjacent substrate material and the adherent material are not impaired. The bonded clad plate according to the present invention has an extremely large dimensional shape and a complicated shape in plan view, which cannot be realized according to various applications, for example, the width dimension of the clad plate is limited by the size of the pressure welding device. It can also be used for cylindrical shapes such as pipes, and can greatly expand the applications while maximizing the characteristics of the clad plate.

In the present invention, in order to maintain the properties of the bead portion without disappearing or changing and to retain the properties of the clad plate before welding in the whole clad plate after welding, for example, a two-layer clad plate is used. In the case of, in the bead portion, it is necessary to control the melting of the alloys or metals forming the clad plate with each other as much as possible, that is, in FIG. It is important to have dimensional control. In order to perform the above control, it is necessary to perform welding on each surface of each material forming the clad plate, so that welding can be performed from one direction, and welding beam diameter can be narrowed as much as possible. That is, in FIG. 1, it is preferable that the volume of the conical bead portion having the diameter a or a ′ and the height d or d ′ can be made as small as possible.
Laser welding, electron beam welding, ion beam welding, or welding means such as TIG or MIG is suitable.

For example, in FIG. 1, when welding a pair of clad plates 2 and 3 made of a high melting point material 4 having a thickness t and a low melting point material 5 having a thickness t ′ by laser welding, first,
The butt portion 8 of the high melting point material 4 is irradiated with a laser and welded to a depth d. At this time, when laser welding is used, the beam can be narrowed down and the abutting portion 8 can be welded, so that the value of a of the bead portion 6 becomes small, which is preferable. Next, the abutting portion 8 of the low melting point material 5 is welded to the depth d ′ by laser welding. Also in this case, a'of the bead portion 7 is the same as above.
Becomes smaller. At this time, even if the low melting point material 5 is welded to the depth d ′, the high melting point material 4 has a higher melting point, so that the low melting point material 5 does not substantially melt into the high melting point material 4. That is, the bead portions 6 and 7 can also be clad, and the properties of the clad plate before welding are retained by the entire joined clad plate 1 including the bead portions 6 and 7 after welding.

The melting between the low-melting material 5 and the high-melting material 4 does not substantially melt if there is a large difference between the melting points of the respective materials, but if the materials have similar melting points, they will melt to some extent. Therefore, it is desirable to appropriately select the temperature and other conditions at the time of welding so that the properties of the entire clad plate after welding hold the properties of the clad plate before welding to the minimum required. As described above, it is most preferable that the depth d and the depth d ′ shown in FIG. 1 do not overlap with each other at the interface between the high-melting point material 4 and the low-melting point material 5, that is, do not melt. In the case of mass production on a large scale, the depth d and the depth d'are made to overlap to some extent so as not to impair the properties of the entire clad plate after welding, whereby the depth control can be relaxed and the production can be carried out smoothly. Like In that case, it is preferable that the depth d of the high melting point material 4 be contained within the thickness t as much as possible, and the welding depth d ′ of the low melting point material 5 slightly exceeds the thickness t ′. That is, Δ (d'-t ') exceeding the thickness t'
This is because only the high melting point material 4 is melted into the low melting point material 5.

On the contrary, the welding depth d of the high melting point material 4 is equal to the thickness t.
If so, the large amount of the low-melting-point material 5 and the surrounding portion of the welding depth d exceeding the thickness t will melt into the high-melting-point material 4, and in some cases, all the bead portions 6 and 7 are made of the high-melting-point material. 4 and the low-melting-point material 5 may be mixed with each other, and the properties of the clad plate before welding cannot be retained by the entire bonded clad plate 1 after welding, which is not preferable. As described above, in order to ease the size control of the depth d and the depth d ′, as described above, the beam diameter of the welding can be narrowed down as much as possible, that is, FIG.
In the above, a welding means capable of minimizing the volume of each conical bead portion having a diameter of a or a ′ and a depth of d or d ′ is preferable.

In the present invention, it is preferable that the clad plate to be welded has two layers as described above, because the effect of the present invention can be most expected, but even if it is a three-layer clad plate or more clad plates, If the melting points or compositions of the metals and alloys that make up the clad plate are similar,
The desired effects of the present invention can be expected. This invention
Since it is possible to provide a bonded clad plate that can handle complicated shapes according to various applications and extremely large dimensions and shapes that cannot be manufactured with the pressure welding equipment currently used industrially, it is impossible to apply until now The intended use, for example,
Use for materials that make up extremely large devices, chemical tanks for various chemical plants (for internal corrosion resistance), materials for coastal area structures (for external corrosion resistance), and various cylindrical shapes such as various pipes Can also be applied. In addition, when it is used in an application where particularly high corrosion resistance is required, for example, a clad plate in which Al or the like is pressure-welded to a SUS material or the like having good corrosion resistance is joined by welding to form a bonded clad plate, and thereafter The clad plate may be subjected to diffusion heat treatment in a required atmosphere to form an intermetallic compound of SUS and Al on the entire bonded clad plate to obtain a bonded clad plate further excellent in corrosion resistance.

[0018]

Example 1 The high melting point material 4 shown in FIG. 2 has a thickness t of 0.7 mm, a width of 650 mm, and a length of 2500 mm.
2Ni—Fe alloy, low melting point material 5 having a thickness t ′ of 0.
A clad plate 2 made of Cu having a width of 3 mm, a width of 650 mm, and a length of 2500 mm, and a clad plate 3 having the same substrate material, the same adhered material, and the same dimensions as those of the clad plate so that the same materials contact each other. The end faces of the plates are abutted against each other, and 42 Ni is first subjected to electron beam welding under the following conditions.
After welding the butted portion 8 on the —Fe alloy side, then C
The butting portion 8 on the u side was welded. Electron beam welding conditions Seam welding speed: 2.5 m / min Vacuum degree: 1 × 10 ⁻⁴ Torr Acceleration voltage: 60 kV Output: 42 Ni—Fe alloy side = 9 mA, Cu side = 5
mA At this time, the thickness Δ of the welded portion 9 of the bead portions 6 and 7 is 8 μ.
m was obtained, and a good bonded clad plate 1 was obtained which retained the various properties of the clad plate before welding. When the above-mentioned welded clad plate was subjected to internal diffusion heat treatment only in the clad surface boundary layer in a reducing atmosphere, the welded clad plate after heat treatment had excellent properties of high thermal conductivity, high electrical conductivity and low coefficient of thermal expansion at room temperature. Had.

Example 2 As the high melting point material 4 shown in FIG. 2, SUS304 having a thickness t of 0.9 mm, a width of 100 mm and a length of 2000 mm, and the low melting point material 5 has a thickness t'of 0.1 mm, a width of 100 mm and a length of 100 mm. Clad plate 2 made of Al having a thickness of 2000 mm, and clad plate 3 made of the same substrate material and same material as the clad plate
And the end faces of the clad plates are abutted against each other so that the same materials are in contact with each other, and the abutting portion 8 on the SUS304 side is first laser output 5 ms / 15 pps (pulse width / repetition) by pulse-type seam welding using a YAG laser. After the welding at 1, the butt portion 8 on the Al side was then welded at 2 ms / 15 pps (pulse width / repetition). At this time, the thickness Δ of the welded portion 9 of the bead portions 6 and 7 was 13 μm, good welding was ensured, and the bonded clad plate 1 having various characteristics equivalent to those of the clad plate before welding was obtained. By heat-treating the above-mentioned welded clad plate in a reducing atmosphere, SUS304 and Al are diffused,
An intermetallic compound of SUS304 and Al was formed. When the welded clad plate subjected to the above heat treatment was applied to the separator mask portion of the molten carbonate fuel cell, the bonded clad plate did not corrode at all even after long-term use, and the molten carbonate type The fuel cell was able to operate smoothly.

[0020]

Industrial Applicability The present invention provides a clad plate having a two-layer structure or a multi-layer structure in which an adherend made of a metal or an alloy having a melting point different from that of the substrate material is pressed against the surface of the substrate material made of a metal or alloy. The end faces of the clad plates are made to abut each other so that the same materials come into contact with each other. First, only the high melting point side material is welded from the abutting part of the surface with the high melting point side, and the melting point is lower. By welding the low melting point side material from the abutting part of the surface on the material side, various properties of the clad plate before welding, such as electrical properties (resistance value etc.), magnetic properties (magnetic property etc.), thermal Loss of various properties such as properties (thermal expansion, heat conduction, etc.), mechanical properties (strength, elasticity, etc.), chemical properties (corrosion resistance, oxidation resistance, solvent resistance, etc.) at the welded part,
The entire bonded clad plate after welding retains its properties without any change, that is, there is substantially no penetration between the substrate material and the adherend material at the weld, and the adjacent substrate material and adherent material are It is possible to obtain a bonded clad plate in which the functions and characteristics of each are not impaired, and it is possible to maintain the functions and characteristics of each clad plate as a synergistic effect of the substrate material and the adherend material before welding as they are. We can provide bonded clad plates that can handle extremely large dimensions and shapes that are not possible with clad plates, complicated shapes in plan, cylindrical shapes such as various pipes, and maximize the characteristics of clad plates. However, its application can be greatly expanded.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view showing a welded state of a bonded clad plate according to the present invention.

FIG. 2 is a vertical cross-sectional explanatory view showing another welding state of the bonded clad plate according to the present invention.

3A, 3B, 3C, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, 3D, and 3D, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bonded clad plate 2,3 Clad plate 4 High melting point material 5 Low melting point material 6,7 Bead part 8 Butt part 9 Melting part 10 Melting part 11 Different material 12 Welding rod

[Procedure amendment]

[Submission date] January 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

In the present invention, in order to maintain the properties of the bead portion without disappearing or changing and to retain the properties of the clad plate before welding in the whole clad plate after welding, for example, a two-layer clad plate is used. if, in the bead portion, as much as possible control to minimize penetration of each other alloys or metals constituting the clad plate, i.e., in FIG. 1, a welding depth of each of the clad plate 2,3 d or d 'of It is important to have dimensional control. In order to perform the above control, it is necessary to perform welding on each surface of each material forming the clad plate, so that welding can be performed from one direction, and welding beam diameter can be narrowed as much as possible. That is, in FIG. 1, it is preferable that the volume of the conical bead portion having the diameter a or a ′ and the height d or d ′ can be made as small as possible.
Laser welding, electron beam welding, ion beam welding, or welding means such as TIG or MIG is suitable.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

[0018]

Example 1 42Ni—Fe alloy having a thickness t of 0.7 mm, a width of 650 mm and a length of 2500 mm as the high melting point material 4 shown in FIG.
The low melting point material 5 has a thickness t ′ of 0.3 mm and a width of 650 m.
m, a clad plate 2 made of Cu having a length of 2500 mm,
The clad plate, the same substrate material, the same material to be deposited, and the clad plate 3 having the same size are abutted to each other so that the same material is in contact with each other. After welding the abutting portion 8 on the 42Ni—Fe alloy side, then the abutting portion 8 on the Cu side
Welded. Electron beam welding conditions Seam welding speed: 2.5 m / min Vacuum degree: 1 × 10 ⁻⁴ Torr Acceleration voltage: 60 kV Output: 42 Ni—Fe alloy side = 9 mA, Cu side = 5
mA At this time, the thickness Δ of the welded portion 9 of the bead portions 6 and 7 is 8 μ.
m was obtained, and a good bonded clad plate 1 was obtained which retained the various properties of the clad plate before welding. When the above-mentioned welded clad plate was subjected to internal diffusion heat treatment only in the clad surface boundary layer in a reducing atmosphere, the welded clad plate after heat treatment had excellent properties of high thermal conductivity, high electrical conductivity and low coefficient of thermal expansion at room temperature. Had.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B23K 26/00 310 S 7425-4E G 7425-4E // B23K 103: 16

Claims (2)

[Claims] 1. A clad plate in which an adherend made of a metal or an alloy having a melting point different from that of the substrate is pressure-welded to at least one surface of a substrate material made of a metal or an alloy, and a clad plate having the same structure as the clad plate. Is a joined clad plate in which the end faces of the clad plates are butted against each other so that the same materials come into contact with each other, and there is substantially no penetration between the substrate material and the adherend material at the welded portion, and the adjacent substrate material And a bonded clad plate characterized in that the functions and characteristics of the adhered material are not impaired. 2. A clad plate in which at least one surface of a substrate material made of a metal or an alloy is pressed against an adherend made of a metal or an alloy having a melting point different from that of the substrate, and a clad plate having the same structure as the clad plate. Butt each clad plate end face so that the same materials contact each other,
After welding only the high-melting-point material from the abutting part of the surface of the material with a high melting point, the low-melting-side material is welded from the abutting part of the surface of the material with a low melting point, and at the welding part, the substrate material and A method for producing a bonded clad plate, wherein the bonded clad plate does not melt into the bonding material and the functions and characteristics of the adjacent substrate material and adherend material are not impaired.