JPH07204868A - Method for partial explosive welding of metallic sheet - Google Patents

Abstract

PURPOSE:To muffle the explosive noise and to prevent the propagation of the impulse wave by enclosing a space including a part to be joined by a portable vacuum container having the volume larger than the gas volume generated by the explosion, and executing the explosive welding after the vacuum container is evacuated. CONSTITUTION:A metallic sheet is lapped on the surface of a metallic base material 2 through a spacer 3 made of plastics so that the prescribed clearance (d) may be present between the surface of the metallic base material 2 and the rear surface of the metallic sheet 1 selected according to the purpose. The explosive 4 is placed on a lower plate B in the set condition at the part to be explosive welded through a buffer material A such as aluminum sheet. An electric blasting cap 5 is arranged on the explosive 4, and after the lead wire 6 of the blasting cap 5 is passed from a lead port 8 out of a vacuum container, the vacuum container 7 is loaded on the lower plate B through a rubber sheet 9, tightened with bolts 10 to enclose the space. The air is evacuated by a vacuum pump, and the electric blasting cap is energized to iginite and explode it to execute the partial explosive welding. This constitution realizes the explosive welding in a safe and noiseless manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a metal sheet having corrosion resistance and antifouling property as a metal base material in the production of metal structures such as marine structures, bridges and various plants in order to prevent corrosion and adhesion of marine organisms. It relates to a method of partial explosive pressure welding on a surface.

[0002]

2. Description of the Related Art Conventionally, the full-scale explosion pressure welding method, the line explosion pressure welding method, and the point explosion pressure welding method have been put into practical use as the explosion pressure welding method of a metal sheet to a metal base material. The full-scale explosion pressure welding method is a method of joining the entire surface of a metal sheet. A method of setting explosives on the entire surface of a metal sheet, detonating the explosives using a detonator, and colliding the entire surface of the metal sheet with a metal base material at high speed. Is. Specifically, it is used to manufacture various clad steels.

The line explosive pressure welding method and the point explosive pressure welding method are methods for locally joining the portions requiring joining, and the explosives are set in a linear or spot form on the metal sheet at the portions requiring joining. In this method, an explosive is detonated using a detonator, and only the portion of the metal sheet on which the explosive is set is collided with the metal base material at high speed to join them. In the line explosion pressure welding method, it is also possible to bend the explosive in a curved shape or branch it depending on the purpose. Specifically, it is used to manufacture chemical devices such as heat exchangers for seawater and tanks for chemicals.

These explosive pressure welding methods are particularly for joining metals having different melting points which are difficult to join by fusion bonding or diffusion joining, or joining between dissimilar metals which generate brittle intermetallic compounds by heating and melting, for example, titanium, aluminum and the like. Good joining is obtained in the combination of carbon steel and carbon steel.

[0005]

However, the conventional explosion pressure welding method has the following problems. (1) When applying the clad steel by the full-face explosion pressure welding method to a metal structure, it cannot be directly applied to a structure having a complicated shape. Therefore, the clad steel produced by joining the flat plates to the structure is used. It will be molded and processed. However, there is a problem that handling becomes difficult because there is a risk of peeling from the bonding interface between the metal sheet and the metal base material in the steps of cutting, bending, welding, etc. of the clad steel.

(2) In addition, since a large amount of explosive is used in the full explosion pressure welding method, it is necessary to take safety measures for propagating shock waves to the surroundings and noise measures for explosion sound.
There was a problem that the place where construction could be done was limited to a remote place or a place where large-scale safety and noise countermeasures were taken. (3) In the line explosion pressure welding method and the point explosion pressure welding method, after the metal structure is formed and processed, the metal sheet can be directly joined, and the amount of explosive is smaller than that of the full surface explosion pressure welding method, but it is still against the shock wave. Since it is necessary to take safety measures and noise countermeasures against the explosion sound, there is a problem that construction sites are limited to remote places or noise countermeasures. The present invention solves the problems of the prior art as described above, that is, the work place is not limited, and the metal sheet having excellent corrosion resistance and antifouling property is directly formed on the surface of the metal base material of the metal structure formed by explosion. The purpose is to provide a method of pressure welding.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is to stack different kinds of metal sheets on a surface of a metal base material of a formed metal structure at a predetermined interval, and to place explosive charge on the metal sheet at the joining portion. It is characterized in that the space containing the joining portion is sealed by a portable vacuum container having a volume larger than the amount of gas generated by explosion, the interior of the vacuum container is evacuated, and then explosive pressure welding is performed. This is a partial explosion pressure welding method for metal sheets.

[0008]

According to the present invention, since the space where the explosion pressure welding is performed is made into a vacuum, the explosion sound at the time of the explosion pressure welding can be silenced and the shock wave can be prevented from propagating to the surroundings. There is no limit to where you can do it. Further, since a portable vacuum container is used, it becomes possible to easily carry out the explosion pressure welding by moving to a necessary explosion pressure welding position.

The volume of the vacuum container for vacuum-sealing the portion to which the explosion is pressure-contacted is such that the amount of gas generated by the explosion is reduced to reduce the sound of the explosion sound and the propagation of the shock wave. Gas is generated, but it needs to be larger than that. If the volume of the vacuum container is smaller than the above-mentioned required volume, not only sufficient muffling and propagation of shock waves cannot be reduced at the time of explosion, but also the container may be damaged. Further, it is not a good idea to increase the volume of the vacuum container too much. Because the plate thickness must be increased in order to secure the strength of the container in a vacuum, the weight becomes heavier and handling becomes difficult, and the workability deteriorates. Therefore, the volume of the vacuum container is set to be larger than the amount of gas generated by the explosion, and safety is determined for this.

[0010]

【Example】

Example 1 FIG. 1 is an example of the present invention and is an explanatory view showing means for performing point explosion pressure welding of a part of a metal sheet to a small metal base material. The means for performing point explosion pressure contact with a part of the metal sheet on the surface of the small metal substrate is the back surface of the metal sheet 1, which has excellent corrosion resistance and antifouling properties selected according to the purpose, on the surface of the metal substrate 2. The metal base material 2 and the surface of the metal base material 2 are stacked so as to have a predetermined distance (d).
Here, the metal sheet 1 is placed on the metal base material 2 via a spacer 3 made of plastic to secure the space (d). Cushioning material A, such as an aluminum plate, on the part where the explosion pressure is applied
Place the explosive 4 on the lower plate (B) via the. Here, the explosive 4 has a cylindrical shape.

The electric detonator 5 is arranged on the explosive 4, and the lead wire 6 of the electric detonator 5 is connected to the lead wire outlet 8 of the vacuum container 7.
After pulling out from the vacuum container to the outside of the vacuum container, the vacuum container 7 is placed on the lower plate B via the rubber sheet 9, and is tightened with the bolt 10 to seal the space including the portion to which the explosion pressure is applied. The lead wire outlet 8 may be filled with clay or the like in order to enhance the sealing effect. Close the valve D of the air inlet 12 of the vacuum container,
The valve C of the exhaust port 11 is opened, air is evacuated by the vacuum pump to evacuate the inside of the vacuum container, and then the valve C of the exhaust port 11 is closed, and a current is passed through the electric detonator 5 by the lead wire 6 to ignite and explode. Perform partial explosion pressure welding. After the partial explosion pressure welding was completed, the valve D of the intake port 12 was opened, air was introduced into the vacuum container to bring it to atmospheric pressure, and then the valve C of the exhaust port 11 was opened.
Further, air is introduced from the intake port 12 and at the same time, the exhaust port 11
Releases the gas generated by the explosion from the vacuum container.

When joining a metal sheet of titanium having a thickness of 0.3 mm, the distance (d) between the metal sheet 1 and the metal substrate 2 is 1.0 to 4.0 mm, and the degree of vacuum in the vacuum container is 1. ．
If the pressure is 3 kPa or less, good bonding can be obtained, shock waves to the surroundings are almost eliminated, and the explosion sound can be reduced to a level at which there is no problem. Further, if the explosive 4 is formed in a string shape, the linear explosion pressure welding can be performed in the same manner. Furthermore, if the above-mentioned partial explosion pressure welding is sequentially repeated at the necessary pressure welding positions of the metal sheet, the explosion pressure welding can be performed over the entire surface of the metal sheet.

Embodiment 2 FIGS. 2 and 3 show an embodiment of the present invention in which the end portion of a metal sheet is partially explosively pressure welded to a wide metal base material by wire explosion welding.
Is a side view of how the vacuum container is attached to the wide metal substrate,
FIG. 3 is a sectional view taken along line AA of FIG. In this embodiment, explosion pressure welding is performed according to the following procedure. First, the back surface of the end of the metal sheet 1 having excellent corrosion resistance and antifouling properties selected according to the purpose on the surface of the metal substrate 2 has a predetermined distance (d) from the surface of the metal substrate 2. On top of. Here, in order to secure the space (d) and to fix the metal sheet 1, the portions which are not subjected to the explosion pressure contact are adhered or adhered by the adhesive or the adhesive 13.

The lower plate (B) with the explosive 4 set along the end of the metal sheet 1 via the cushioning material A such as an aluminum plate.
Put on. The explosive 4 is in the form of a string. The electric detonator 5 is arranged on the explosive 4, and the lead wire 6 of the electric detonator 5 is arranged.
After pulling out from the lead wire outlet 8 of the vacuum container 7 to the outside of the vacuum container, the space including the part where the partial explosion pressure contact is made is sandwiched between the vacuum container 7 and the lower plate (B), and rubber is put in the empty space. Insert the sheet 9 and tighten with bolts 10 to seal. The vacuum container 7 and the lower plate (B) are connected to each other with a hinge 14 provided on one side, so that they can be easily attached and detached. In order to enhance the sealing effect on the lead wire outlet 8,
It may be filled with clay or the like.

Close the valve D at the inlet 12 of the vacuum container,
The valve C of the exhaust port 11 is opened, air is evacuated by the vacuum pump to evacuate the inside of the vacuum container, and then the valve C of the exhaust port 11 is closed, and a current is passed through the electric detonator 5 by the lead wire 6 to ignite and explode. Perform partial explosion pressure welding. After the partial explosion pressure welding was completed, the valve D of the intake port 12 was opened, air was introduced into the vacuum container to bring it to atmospheric pressure, and then the valve C of the exhaust port 11 was opened.
At the same time that air is introduced from the intake port 12, the exhaust port 1
The gas generated by the explosion from 1 is released to the outside of the vacuum container.
When the partial explosion pressure welding of a predetermined portion is completed, the vacuum container 7 and the lower plate (B) are moved to the next pressure welding location, and the line explosion pressure welding of the required length can be performed by repeating the partial explosion pressure welding in the same manner.

Embodiment 3 FIGS. 4 and 5 show an embodiment in which the present invention is applied to a steel pipe. FIG. 4 is an explanatory view of the attachment state of a vacuum container to the steel pipe, and FIG. 5 is a sectional view taken along line BB of FIG. Is. The procedure is the same as that of the second embodiment except that the vacuum container 7 is attached. However, the attachment of the vacuum container 7 to the steel pipe is performed by hanging the holding material 16 previously attached to the vacuum container 7 on the pipe end of the steel pipe 15. 7 and the steel pipe 15 and the holding member 16 and the steel pipe 15 into which the rubber sheets 9 corresponding to the respective gaps are inserted, the bolts 10 of the holding member 16 are used to tighten the steel plate 17 for the contact plate, and the explosion pressure welding is performed. The space containing the part to be sealed is sealed. When the partial explosion pressure welding of the predetermined portion is completed, the vacuum container 7 is moved in the circumferential direction of the steel pipe, and the explosion pressure welding is sequentially repeated to perform the explosion pressure welding over the entire circumference of the steel pipe.

[0017]

According to the present invention, the space of the portion where the metal sheet is explosively pressure-welded to the metal base material is evacuated and pressure-welded, so that a great effect can be obtained in silencing the explosion sound and preventing the propagation of shock waves. Moreover, since the vacuum container is portable,
The metal sheet can be explosion-pressed directly to the formed metal structure, and the work can be performed while easily moving to the required explosion-pressure welding point. Can be pressed.

[Brief description of drawings]

FIG. 1 is an explanatory view of point explosion pressure welding of a metal sheet to a small metal substrate according to the present invention.

FIG. 2 is a side view showing how a vacuum container is attached to a wide metal substrate.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an explanatory diagram of how the vacuum container is attached to the steel pipe.

5 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Metal Sheet 2 Metal Substrate 3 Plastic Spacer 4 Explosive 5 Electric Detonator 6 Electric Detonator Lead Wire 7 Vacuum Container 8 Lead Wire Outlet 9 Rubber Sheet 10 Bolt 11 Exhaust 12 Intake 13 13 Adhesive or Adhesive 14 Hinge 15 Steel pipe 16 Holding material 17 Steel plate for backing plate

Claims (1)

[Claims] 1. An amount of gas generated by explosion by stacking dissimilar metal sheets on a surface of a metal base material of a molded metal structure at a predetermined interval and disposing explosive on the metal sheet at a joining portion. A method for partial explosion pressure welding of a metal sheet, which comprises sealing a space including a portion to be joined with a portable vacuum container having a larger volume, evacuating the inside of the vacuum container, and then performing explosion pressure welding.