JPS591511B2 - Seal material for electron beam welding - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sealing material for electron beam welding.

When performing the electron beam welding method, it is necessary to maintain a low vacuum atmosphere at the welding location. Therefore, when welding small items, the entire part is placed in a vacuum box and the welding process is postponed. This is an example. However, when welding a long object such as joining wide steel plates, it is difficult to store the entire object in a vacuum box, and the following problems arise when welding such a part. That is, as shown in Fig. 8, when welding a small piece of steel 2 to a large steel plate 1, it is necessary to seal the part of the large steel plate 1 including the plate end 3; There are two portions 4 where the level difference depending on the thickness of the steel plate 1 must be compensated for. On the other hand, in order to weld steel plates 1 of the same size, there is a portion 4 at each end of each steel plate 1 for which the level difference must be compensated. When sealing such a location, two types of sealing must be performed at the same time: sealing on the surface of the steel plate and sealing on the stepped portion 4. For this reason, the following method has conventionally been adopted to seal such locations. That is, a tab plate of the same thickness as the welded material is attached to the end face of the welded material through a gasket or directly,
This eliminates the difference in thickness due to the plate thickness of the material to be welded, and makes the compressibility of the sealing material uniform to bring the sealing material into close contact with the upper and lower surfaces of the material to be welded. However, this method has the following drawbacks. (1) It is necessary to change the length of the tab plate each time the longitudinal length of the plate changes, which increases the number of tab plates to be prepared in advance. (2) After welding is completed, it is necessary to cut the bonded or welded portion between the tab plate and the material to be welded, which complicates the process. (3) When the shapes of the materials to be welded are diversified as in the case of small waterfall boat assembly, the number of types of tab plates used increases, and the conventional method lacks versatility.The present invention overcomes these drawbacks. The present invention provides a sealing material that eliminates this problem, and its configuration is such that flat portions that serve as sealing surfaces are provided on the upper and lower outer surfaces of a cylindrical body in a sealing material used in a vacuum chamber for electron beam welding, and the cylindrical body The cylindrical body is characterized in that both sides of the cylindrical body are corrugated to form a bellows-shaped air chamber that communicates with the interior of the cylindrical body, and that the cylindrical body is given elasticity to compensate for the difference in level of the seal portion.

The present invention will be explained in detail below based on the drawings.

When electron beam welding is performed by partially sealing a portion including the end of the material to be welded, instead of using the conventional method of using a tab plate, a triangular piece of a triangular plate shape is attached to the end surface of the material to be welded, and the bottom surface and the By attaching it so that it is in close contact with the end face, it is possible to eliminate the level difference caused by the thickness of the material to be welded and improve the sealing effect.

In this case, in the sealing method using such a triangular piece 10, if a flexible chamber such as rubber is used for the vacuum chamber 17, the thickness of the upper and lower sealing materials 14 and 15 in contact with the workpiece 5 and the triangular piece 10 can be reduced. (See Figure 1). Alternatively, a soft rubber may be used as the sealing material, and the elasticity of the rubber may be used to compensate for the difference in compression due to changes in plate thickness (see Figure 2). Furthermore, if the sealing materials 14 and 15 are made of highly elastic bellows, a remarkable sealing effect can be obtained even in the case of a material to be welded with a large thickness (see FIG. 3). The present invention relates to the bellows type sealing material. (See Figures 4 to 7). The sealing material 20 has a cylindrical shape, and a flat portion 23 serving as a sealing surface is provided on an upper outer surface 21 and a lower outer surface 22 of the cylindrical body.

Further, both sides 24 of the cylindrical body are wave-shaped, and an air chamber 25 is formed inside the cylindrical body, forming a bellows shape. The air chamber 25 may be closed on both sides (see FIG. 7),
Also, it does not have to be occluded (see Figure 6). However, when the air chambers 25 are closed, a small hole is provided in the partition wall 26 to communicate the air chambers 25 with each other. In such a configuration, the bellows type sealing material 20 is attached to the upper sealing material 14 together with the triangular piece 10.
and the material to be welded 5 when used as the lower seal material 15.
A remarkable sealing effect can be obtained even when there is a large step difference due to the plate thickness.

That is, the internal pressure of the sealing material 20 is released in advance, and the sealing material 20 is brought into close contact with the upper surface 12 and lower surface 13 of the welded material 5, respectively, with the sealing material 20 in a contracted state. After that, the triangular piece 10 is inserted into the end face 6 in the same manner as described above, and then air pressure is applied inside the sealing material 20 to press the welded material 5, the sealing material 20, and the triangular piece 10 into contact with each other, and the plate end 3 Seal the parts containing the parts. In this case, the sealing material 20
In addition to the compressibility of the material, the material has flexibility due to the bellows shape, so together with the triangular piece 10, the effect of the step due to the plate thickness is well compensated for, and a remarkable sealing effect is achieved. According to the sealing material according to the present invention described above, the material to be welded can be transported with the sealing material attached to the material, and the vacuum box of the welding machine can be made fixed.

Furthermore, there is no need to change the sealing material depending on the thickness of the material to be welded, resulting in superior versatility.

[Brief explanation of drawings]

1, 2 and 3 are partial perspective views showing a sealing material according to the present invention together with a vacuum chamber, and FIGS. 4 to 7 are cross-sectional perspective views showing a bellows type sealing material according to the present invention. 4 shows the case when it is expanded, FIG. 5 shows the case when it is contracted, and FIG. 8 is an explanatory diagram showing the sealed part. In the drawings, 1 is a steel plate, 2 is a steel piece, 3 is a plate end, 4 is a stepped portion, 5 is a material to be welded, 7 is a gasket, 10 is a triangular piece, 14 is an upper sealing material, 15 is a lower sealing material, 20 is a sealing material, 21 is an upper outer surface, 22 is a lower outer surface, 23 is a flat part,
24 is both side parts, 25 is an air chamber, and 26 is a partition wall.

Claims (1)

[Claims] 1. In a sealing material used in a vacuum chamber for electron beam welding, a flat part is provided on the upper and lower outer surfaces of a cylindrical body to serve as a sealing surface, and both sides of the cylindrical body are formed into a corrugated shape so that the inside of the cylindrical body is sealed. 1. A sealing material for electron beam welding, characterized in that an air chamber is formed in the cylindrical body to form a bellows-shaped body that communicates with each other, and the cylindrical body is given elasticity to compensate for the step difference in the sealing part.