JPS6213271A - Lamination joining method for different kind metallic sheet - Google Patents

Abstract

PURPOSE:To join with lamination easily a different kind metallic sheet of which welding is impossible by performing the inner lining with the covering piece of the same kind as the metallic sheet on the other part of the above part where the clamp fitting hole arranged on the metallic sheet of the other part is locked by fitting to the clamp which is welded to the metallic sheet of one part after so doing. CONSTITUTION:A clamp fitting hole 4 is arranged on the metallic sheet stock 3 of the other part to be overlapped on the metallic sheet stock 1 of one part. The metallic sheet stock 3 is held by the metallic sheet stock 1 by locking to the hole edge of the clamp fitting hole 4 by bending toward the olutside the tip of the clamp 2 after overlapping the sheet stock 3 on the sheet stock 1 by fitting the clamp fitting hole 4 of the sheet stock 3 of the other part to the clamp 2 of which base part is welded to the metallic sheet stock 1 of one part. The peripheral edge of a covering piece 6 is then welded to the metallic sheet stock 3 by covering the clamp fitting hole 4 and clamp 2 by the covering sheet piece 6 of the same kind as the metallic sheet stock 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for laminating and joining dissimilar metal plates that are difficult to weld together.

(Prior Art) In chemical plants, etc., in order to improve the corrosion resistance of equipment made of metal materials, for example, the inner surface of a chemical reaction vessel is made of a highly corrosion-resistant metal material that cannot be welded to the metal plate material that makes up the vessel. However, in laminated joining of dissimilar metal plates that cannot be welded, a bolt is inserted through the two metal plates, tightened with a nut, and then the head of the bolt is covered with one of the metal plates and the same material. Generally, a method is adopted in which the material is temporarily covered and its peripheral edge is welded to one of the metal plates. However, with this method, since bolt holes are provided that communicate with both metal plates, if there is a slight welding defect in the welded area on the periphery of the cover plate, the inside and outside are communicated through the bolt holes, causing chemical damage. It is unsuitable for reaction vessels and hazardous materials storage containers, and in addition, the cover plate that covers the bolt head swells up, creating a raised shape in places on the plate surface, and when it comes into contact with fluid, turbulence occurs in these areas. It also causes cavity corrosion and reduces corrosion resistance. Therefore, JP-A-59-22
A dissimilar metal lamination bonding method as shown in No. 9293 has also been proposed. The invention described in this publication is that when two mutually unweldable dissimilar metal plates are joined by providing a clearance between them, an insert piece is sandwiched between the two dissimilar metal plates, and the dissimilar metals are placed in a solid phase. Dissimilar metal plates are joined by welding the dissimilar metal plates to the corresponding metals of the joined insert pieces, but in the above method, the opposing joining surfaces of dissimilar metal chips are solid-state welded and integrated. In addition to the problem of having to mass-produce the insert chips with the desired combination of dissimilar metals, there is also the problem of having to always have insert chips with the desired combination of dissimilar metals on hand. If the metal plate is adopted as a metal plate, it will require I3, and furthermore, a clearance will necessarily be created between different metal plates.

(Problems to be Solved by the Invention) The problems to be solved by the present invention are to solve the problems of the conventional methods as described above, and to have safety that satisfies safety standards such as the Fire Service Act. An object of the present invention is to provide a method for laminating and joining dissimilar metal machines that is easy to construct and can be applied to combinations of various metals (means for solving problems). A clasp fitting hole is arranged in the other metal plate material that cannot be welded to the metal plate material to be welded, and the outside of the tip of the clasp that has been welded to the metal plate ring and fitted into the clasp fitting hole. The other metal plate is bonded and held to one metal plate by locking the direction bent part to the edge of the clasp fitting hole, and then the clasp is fitted with a cover plate piece of the same size as the other metal plate. This is characterized in that the peripheral edge of the cover plate piece is welded to the other metal plate covering the dowel hole and the stopper.

In the present invention, when laminating and joining different types of metal plates that cannot be welded, one metal plate that serves as a base material, a clasp that can be welded to the metal plate, and a metal that cannot be welded to the one metal plate. The other metal plate is provided with a clasp fitting hole large enough to fit the clasp at the required location, and is made of a metal that can be welded to the metal plate and is sufficient to cover the clasp fitting hole. A clasp whose base is welded to one metal plate is fitted into the clasp fitting hole of the other metal plate overlaid on one metal plate, and A first step of bonding and holding the other metal plate to one metal plate with an outwardly bent portion that protrudes from the surface of the metal plate and engages with the hole edge of the clasp fitting hole; and clasp fitting. Attach the hole and the clasp with the outward bent portion fitted into the hole to the other metal plate.
The second step is to cover the inner edge with a covering plate piece of the same type as the other welded metal plate material to form a lining surface that hardly bulges out. In addition, in the first step, a short tubular clasp is welded to one of the metal plates in advance, and the other metal plate having a clasp fitting hole corresponding to the clasp is attached to the clasp. An outward bent part that is overlapped with one metal plate while engaging with the clasp fitting hole, and the protruding tip of the short tubular clasp is enlarged in diameter to engage the edge of the clasp fitting hole. However, in cases where the clasp is in the shape of a cap with a flange, the bottom of the clasp is formed by overlapping both metal plates and fitting the clasp into the clasp fitting hole. It may be spot welded to one of the metal plates, and the clasp does not necessarily have to be cylindrical, and the outwardly bent portions may also be a plurality of claw-like pieces instead of a series of brim-like pieces.

Furthermore, although the material of the stopper is generally the same as that of one metal plate, it may be a different metal as long as it can be welded.

(Example) When manufacturing a tank for combustible materials that is made of a steel plate lined with a titanium alloy plate, the tank body is manufactured using an iron plate with a wall thickness of 3 mm as the base material, and its inner surface is A short pipe with a diameter of 20mm and a length of 10mm was welded at 4 (la intervals) as a clasp (2).Next, a titanium alloy plate with a wall thickness of 1mm was welded as the other metal plate (3). Prepare this 4
0 (Diameter 22 dragon holes (4) are arranged at J intervals,
This other metal plate (3) is placed on the inner surface of one metal plate (1) with the clasp (2) fitted into its clasp fitting hole (4), and then the clasp (2) ) was enlarged in diameter to form an inwardly bent portion (5) and engaged with the hole edge of each stopper fitting hole (4). Next, prepare a large number of circular cover plate pieces (6) made of titanium alloy plates with a thickness of W-1wsm and a diameter of 7e+a, and fold them inward into each of the clasp fitting holes (4) and clasps (2). The curved portion (5) was covered with the inner surface of the other metal plate (3), and the peripheral edge of each cover plate piece (6) was welded to the other metal plate (3) to produce a product.

The product obtained in this way has no holes such as port insertion holes on one metal plate +11, so there is no risk of the fluid stored in the tank leaking out to the outside, and it is extremely safe and meets safety standards. Although the base material was iron, the inner lining was a titanium alloy plate, so it was fully satisfactory in terms of both structural strength and corrosion resistance. Also,
Since the cover plate piece (6) also protrudes only slightly from the other metal plate material (3), it has a good appearance and does not cause any inconvenience in terms of cleaning or other maintenance.

(Effects of the Invention) As is clear from the above description, the present invention enables accurate and easy lamination joining of dissimilar metal plates that cannot be welded together, without causing any bulge in the joint area, and in addition, it is possible to The problem is that it is necessary to mass-produce insert chips in which metal chips are solid-phase bonded, and it is necessary to constantly produce insert chips in which dissimilar metal plates are combined in the desired combination. In addition, there is no problem of clearance between dissimilar metal plates, and compared to the method of tightening the plates with bolts and covering the tightened structure with metal plates of the same type and welding, Komei found that there is no problem with the protrusion of the joint structure. is extremely low, and the extent to which turbulent flow occurs in this area, causing cavitation and reducing corrosion resistance, is greatly reduced compared to grooves.The present invention, which has these advantages, will contribute to the development of industry to a great extent. There is something.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of essential parts showing an example of a dissimilar metal laminate obtained by the method of the present invention. (1) One metal plate, (2): Clasp, (3): Other metal plate, (4) Clasp fitting hole, (5): Inward bend, (6) Cover Piece of board.

Claims (1)

[Claims] A metal plate that is overlapped with one of the metal plates is provided with a clasp fitting hole in the other metal plate that cannot be welded, and the metal plate is welded to one of the metal plates and fitted into the clasp fitting hole. The outward bent portion of the tip of the clasp is engaged with the hole edge of the clasp fitting hole to bond and hold the other metal plate to one metal plate, and then the same material as the other metal plate is attached. A method for laminating and joining dissimilar metal plates, characterized in that the cover plate piece covers the clasp fitting hole and the clasp, and the peripheral edge of the cover plate piece is welded to the other metal plate.