JPS62244585A - Welding method for aluminum clad material - Google Patents

Abstract

PURPOSE:To prevent a penetration bead from being formed by butting mutually clad materials forming edge joints in the direction of the core material sides to edges of leather materials in advance and welding the edge joints of the edges of the leather materials and next, butt-welding the core materials. CONSTITUTION:The core materials 2 are eliminated in the edges of the clad materials and the edges of the leather materials 3 are bent to the core material 2 sides and a groove 5 is formed with the edge joints 4 at a request. In case of welding, the edge joints 4 are joined by the fusion-welding without filler metal, the TIG welding, etc., and a welded part 6 is formed and next, the groove 5 is buried with welded metal 7. In this way, a high-grade weld zone is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for welding crat materials using pure aluminum hair + υ material and aluminum alloy as two hem materials, and particularly relates to a welding method for welding a crat material using pure aluminum hair + υ material and aluminum alloy as two hem materials. The present invention relates to a method suitable for welding pipes for high-vacuum equipment, which is required to stop ti11.

[Conventional technique v/j] Aluminum and aluminum alloy materials have good corrosion resistance,
It is widely used in various applications because of its excellent properties such as non-magnetism, radiation resistance, low emitted scum, and light weight. In this case, aluminum cladding material is used for thinner walls and lower costs.

For example, aluminum alloy materials are being adopted for vacuum film forming equipment such as ion implantation and ion plate ink, and high vacuum equipment that reaches a vacuum degree of 10 to 1 O Torr, such as vacuum beam chambers of proton accelerators.

For example, materials for ultra-vacuum equipment such as proton accelerators with a vacuum level of 1 O Torr or higher have traditionally been mainly made of stainless steel, but materials made of aluminum emit less gas during medium vacuum operation, +9+ 4i It exhibits characteristics such as: (3) good heat conduction, which causes less distortion, (4) completely non-magnetic and easy to write, etc. .

Its application is being attempted.

However, in the case of aluminum alloys, alloying elements with high vapor pressure may vaporize under high vacuum conditions.

It was found that the particles diffused onto the surface, and the application of aluminum cladding material is being considered. .

On the other hand, in A1 facilities that store hydrogen peroxide and concentrated nitric acid,
Aluminum cladding material is used to prevent decomposition and corrosion of stored materials.

As components of these devices and facilities, clad pipes such as piping, or clad plates are used for containers, tanks, etc., and these are welded to obtain the desired size. Hereinafter, in this specification, the clad pipe and the clad plate will be collectively referred to as the clad material.

Welding methods for these cladding materials are described, for example, in Japanese Patent Application Laid-Open No. 52-1
As shown in Publication No. 2637, butt welding has been used, but since it is a simple butt weld, it is impossible to prevent nine-wave heat from forming on the inner skin material side. Ta. To explain this with reference to Figure 3, cladding material a
, a, at the ends of these clad materials a and a consisting of a core material S and a skin material C, the core materials S and h are removed to form a groove d, and this groove d The welding operation is performed by the I-step in which the weld metal e is filled with the weld metal e, and at this time, the uranami bead f on the skin material C side is formed. The presence of such a thick Uranami bead f results in the presence of a porous oxide film in that part, and when using vacuum equipment,
It is desirable to keep the amount as small as possible because it may cause emitted dregs or cause outgassing if there is poor fusion. In addition, in the case of tanks made of hydrogen peroxide, the uranami bead became the starting point for tank corrosion.

The applications listed above include Al-Mg-8i alloys and Al-Mg
However, even if pure aluminum filler metal is used during welding, Mg will diffuse to the uranami bead due to welding heat, resulting in a decrease in the strength of the core material.
It could also cause corrosion and gas emissions. .

E. Purpose of the Invention] In view of the point L, this invention proposes a welding method that can minimize the occurrence of underwave beads in welding aluminum clad materials, and furthermore, This purpose proposes a method that can eliminate the need for filler metal in welding.

[Structure of the Invention] That is, the present invention provides a method for butt welding an aluminum clad material made by cradling a pure aluminum skin material to an aluminum alloy core material, by caulking the ends of the skin material and forming an edge toward the core material side. After butting together the cladding materials that have formed the joints, either (a) weld the edge joints at the ends of the skin material, and then perform butt welding of the core material;

(b) To the T6 joint of aluminum clad material, which is characterized by simultaneously welding the joint at the end of the skin material and the core material.

41 It is related to the method.

Aluminum cladding materials can be made in appropriate combinations depending on the application, and the higher the purity of pure aluminum, the better its corrosion resistance, etc., so it is supplied by the three-layer decomposition method or the segregation solidification method. High purity aluminum of 90.9411% or higher is particularly desirable, for example as a cladding material for high vacuum equipment.

1. The skin material is made of pure aluminum with a purity of 99.5% or more, preferably 0% or less, and 0% or less. ITS A3052.
A3083. A cladding material with a core material such as A6063 alloy is used.

Also, as a clay material for hydrogen peroxide solution and concentrated nitric acid storage facilities, TTS Al050. As A10711 composite skin material, JIS A3052. A cladding material with A3083 alloy as a core material is used.

In addition, this type of clad material is manufactured by conventional methods such as direct extrusion, indirect extrusion, hydrostatic extrusion, pultrusion, and welding of clad plates in the case of pipes, and rolling method, It is manufactured by a roll bonding method, an explosive pressure welding method, etc., and the wall thickness relationship is determined as appropriate depending on the application and desired characteristics.

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

This invention has the following advantages: 1. When applied to a Talarad pipe, welding is performed around the entire circumference of the pipe, and the welding takes place as exemplified in the cross-sectional view of Figure 1. If the welding is carried out in the welding area, similar welding is performed on the four sides of the plate, etc., and as an embodiment of the present invention, an enlarged cross-sectional view near the welded part is shown in the second figure.
This is shown in Figures (a-1) to e-1).

When butt welding the crat material, remove the core material 2 at the end of the crat material 1, bend the end of the skin material 3 toward the core material, and form an edge joint 4 and a groove 5 if desired. do.

The height H) of the edge joint 4 is approximately the same as the height of the core material depending on the wall thickness relationship between the core material 2 and the skin material 3, presence or absence of a groove, size, etc.
The shapes are vertical (48 in Figure 2 (b-1)), curved (4b in Figure 2 (c, -1)), and letter-shaped (Figure 2 (c, -1)). (d-1-) is 4cl.In addition, when forming a groove, its shape is as usual,
It can be made into an appropriate shape, such as a ■-shape, a V-shape with a groove angle α, and a ■-shape with a root surface. These shaping processes are performed by lathe processing, milling, planer processing, spatula grinding, drawing, press bending, etc. After processing, degreasing treatment is performed using toluene, ethyl alcohol, etc.

Welding is performed by welding the edge joint 4 and groove 5 separately in two stages (Fig. 2 (a-2) to (d-2)), and by simultaneously welding the edge joint 4 and groove 5. (Figure 2 (e-2)) can be adopted.

When welding in two stages, first weld the edge joint 4 by tanning (Fig. 2 + a-2), (b-2), (e-2).
).

TIG welding (Fig. 2 (c-2) 1., electron beam welding (
(Fig. 2 (d-2)) or friction welding (not shown, applied to ■-shaped grooves), etc. to form the welded part 6.
The groove 5 is then filled with the deposited metal 7 by TIG welding, MTG welding, pulsed arc welding, etc.

In addition, Fig. 2 (b-2) PI (c-21 is the core material 1!!
In this case, a filler metal with a purity equal to or higher than that of the skin material is used to filler the edges as shown in Figure 2 (c-2). It is also possible to weld joints. On the other hand, when welding in one stage, the second
This is done by providing a groove as shown in Figure (e-11) or by tanning and welding the edge joint 4 with a very slight groove.

The welding conditions for these weldings can be appropriately selected according to the wall thickness etc. by a conventional method, but for example, if the skin material is 0.
When the core material is a clad material with a thickness of about 1 m and the welding current is 40 to 65 A, welding can be performed in -pass. □Also, when the skin material is 3IIWl and the core material is a crat material of about 20 mm, multi-layer welding is used, but in both cases, if the conditions are such that the welded part 6 does not heat up and form an underwave bead, The conditions can be set as appropriate.

It goes without saying that the filler metal used during welding is appropriately selected using conventional methods. AQ etc.
For the core material, A31R3, A3356 alloys, etc., which are similarly defined in the JTSZ3232 standard, are used.

By performing welding using the welding structure as described above, it is possible to prevent the generation of the underwave bead, and the occurrence of various defects due to the underwave bead can be solved. In addition, when simply butt welding is performed using the conventional method, 0.0
Although diffusion of Mg reaching about 5 to 0.2% by weight was observed, this can be prevented by the method of the present invention.

[Example] The present invention will be explained in detail below with reference to Examples, but the invention is not limited thereto.

Example 1 Meat pressure 0. F) 11111 pure aluminum skin with a purity of 99.941%, wall thickness 1.0+nn+, 1TSA60
Clad pipe with inner diameter of 36 m (total length 2
Prepare two pieces of m) with a 2mm height hem joint and a bevel angle of 30.
After degreasing the machined surface with toluene with a groove of 2+nm on the root surface formed at the end thereof, the specimens were butted and arranged using a jig as illustrated in FIG. 3 (a-1).

Next, while rotating both pipe sides, hold T in a downward position.
The edge joint was tanned and welded using an IG welding burner to form a welded part as shown in FIG. 3(a-2).

Next, after solidifying the welded part, the welding current was 40A and the welding speed was 3.
-Bath TTG welding was carried out using ITsA5+83 alloy filler metal (.1!cm/min) in an argon gas atmosphere.

After welding, the inner surface of the pipe was observed, and no Uranami heat was observed, indicating that it could be used as a proton accelerator pipe.

Example 2 ITS with a plate thickness of 3 m for hydrogen peroxide storage tank
A] 1TSA5 made of 070 alloy skin material and plate thickness 10rMn
01 (11 m X
Prepare two pieces of 2 ml, and use a planer and press to form an edge joint with a height of 101 m1, a bevel angle of 90°, and a bevel with a root surface of 3 mm, as shown in Figure 3 (Figure c-11). Then, the center part of the edge joint was brought into contact with TTt;7f1 using TTSAI070 alloy filler metal, and then welding current was 60A and welding speed was 3 (2) for 7 minutes. So, ■l5A5
14 356 alloy filler metals! Then, three layers of MIG welding were performed.

After welding, the inner surface of the pipe was inspected, but no Uranami beat formation was observed, and no Mg diffusion into the welded area was detected.

``Effect of the invention 1 This invention proposes a welding method for aluminum clad materials that adopts the welding structure as described in ^11. By selecting the correct material, it is possible to appropriately prevent the formation of a uranami bead.1 This allows for high-quality welded parts5. Materials for facilities, etc. can be provided appropriately.

[Brief explanation of drawings]

Figure 1 shows the application of this invention to a clad pipe (e-2
) is an enlarged schematic sectional view showing the state of the welded part after welding, and FIG. 3 is an enlarged sectional view of the welded part of the clad material according to the conventional example. In addition, in the figure. 1 Crat material 2 Core material 3 Sill material 4 Edge joint 5 Groove 7 Welded metal. Procedural Procedures...Authentic Book (Method) /62r 1985 Tamatsuki Commissioner of the Patent Office Black 1) Mr. Yu Aki■, Indication of the case 1986 Patent Application No. 87118 2, Name of the invention Welding of aluminum crat material Method 3: Relationship with the case of the person making the amendment Patent applicant (474) Name: Nippon Light Metal Co., Ltd. 4, Agent

Claims (1)

[Claims] 1) In butt welding of an aluminum clad material made by cladding an aluminum alloy core material with a pure aluminum skin material, an edge joint is formed in advance at the end of the skin material toward the core material side. After butting together the cladding materials, (a) weld the edge joint at the edge of the skin material and then butt weld the core material, or (b) weld the joint at the end of the skin material and the core material simultaneously. A method for welding aluminum clad materials, characterized by: 2) The method for welding an aluminum clad material according to claim 1, wherein the clad material is a pipe for high vacuum equipment.