JPH05318125A - Welding of clad material of not weldable dissimilar metals - Google Patents

Abstract

PURPOSE:To join a clad steel made of not weldable dissimilar metals by forming a clad sheet with explosive cladding between not weldable metals, forming a band sheet with cutting the clad sheet on the direction perpendicular to the explosive cladded part and welding the band sheet with a lining material. CONSTITUTION:When an not weldable clad stock 15 and clad stock 17 are joined, the clad material 15 with the weldable metal 12 and the clad material 17 with weldable metal 13 are explosively cladded to produce the clad material 11. The clad material 11 is cut along the cutting line CL perpendicular to the joining part 18 to produce the spacer 20. The spacer 20 is arranged at joining part of the clad material 15, 17, the clad material 15 with the metal 12 and the clad material 17 with the metal 13 are welded, to join the clad stocks 15, 17 through the spacer 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a clad material composed of dissimilar metals that cannot be joined in equipment used in petroleum refining plants and chemical plants.

[0002]

When corrosion resistance is required in equipment generally used in petroleum refining and chemical plants, lining steel or clad steel is used, and these equipment are manufactured by joining lining steel or clad steel. .. Although various joining methods have been proposed, as one of the methods, as shown in FIG. 4, a clad material 2 attached to a first base material 1 (a lining material may be used, but hereinafter, simply referred to as a clad material). And the clad material 4 attached to the second base material 3, the base material 1 and the base material 3 are first welded m, and then the spacer 5 is attached to the abutting portion of the clad material 2 and the clad material 4. Are inserted and welded through a joint material 6 made of the same material as the clad materials 2 and 4.

By the way, in order to reduce the manufacturing cost even in the recent chemical plant equipment, the clad material 2 to which the first base material 1 is attached and the clad material to which the second base material 3 are attached according to corrosion resistance. It is considered that the material 4 is divided into different kinds of non-weldable metals such as titanium and stainless steel. Generally, when joining dissimilar metals that cannot be welded, clad steel is used as a joint.
That is, as shown in FIG. 5, when the first metal 7 and the second metal 8 cannot be welded, the first metal 7 ′ and the second metal 8 ′ are explosively bonded and It is practiced to use a joint 9 made of clad steel. Also, as another method, FIG.
It is also known to weld the clad materials 7 and 8 using a joint 10 made of clad steel 7'and 8'as shown in FIG.

[0004]

If the clad material provided on the base material is a dissimilar metal that cannot be welded, there is a problem in using the above-mentioned joint. That is, since such a joint is directly mounted on the base material, it requires a work precision, and the portion of the joint clad material comes into contact with an object to be treated with a fluid. Therefore, the use of the joint 9 shown in FIG. 5 increases the fluid resistance of an object to be processed which flows on the inner surface of the joint 9 or deposits, and if many such joints 9 are present, it is not preferable for plant operation. .. Further, when the joint 10 is used, there are problems that the work is extremely complicated and the cost becomes high.

[0005]

The present invention has been made in order to solve the above-mentioned conventional problems, and a method for joining a clad material made of a non-weldable dissimilar metal according to the present invention is The first metal 12 and the second metal that cannot be welded to the first metal 12 are explosively bonded 18 to form the clad plate 1.
1 is formed, and the clad plate 11 is attached to the explosive bonding portion 18
A lining material or a clad, which is cut in a direction intersecting with to form a band-shaped plate 19, the first metal 12 of the band-shaped plate 19 is attached to the first base material 14, and can be welded to the first metal 12. The second metal 13 of the strip plate 19 is attached to the second base material 16 and is welded to the material 15, and is welded to the lining material or the clad material 17 that can be welded to the second metal 13. ing.

[0006]

EXAMPLE An example of a method for joining a clad material made of a non-weldable dissimilar metal according to the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of the clad plate 11. The clad plate 11 is formed by explosion-bonding a first metal 12 and a second metal 13 to form a clad plate having a thickness W. The first metal 12 is selected from the same or weldable metals as the clad material 15 attached to the first base material 14 shown in FIG. 3, and the second metal 13 is the second base material. 16
A metal which is attached to the same as the clad material 17 or which can be welded is selected. The clad plate 11 thus formed intersects with the explosive bonding portion 18 of the first metal 12 and the second metal 13, and preferably has a tangential disconnection line C in a direction orthogonal thereto.
The L-shaped plate 19 is cut by an electron beam or the like by L, and as shown in FIG. 2, a band-shaped plate 19 made of the first metal 12 and the second metal 13 and having a width W is formed. And this strip 1
9 is bent according to the place of use.

Then, as shown in FIG.
The first base material 14 with the second and the second base material with the clad material 17
The base materials 16 are welded together, a spacer 20 is inserted into the welded m portion, and the first metal 12 of the strip plate 19 is placed on the clad material 15 side and the second metal 13 is placed on the clad material 17 side. And welded.

[0008]

As described above, the method for joining a clad material made of a non-weldable dissimilar metal according to the present invention includes a first metal 12 and a first metal 12.
18 of the metal 12 and the second metal which cannot be welded
Then, the clad plate 11 is formed, and the clad plate 11 is cut in a direction intersecting the explosive bonding portion 18 to form a strip plate 19
And the first metal 12 of the strip 19 is attached to the first base material 14 and is welded to a lining material or a clad material 15 that can be welded to the first metal 12, and
The second metal 13 of the strip plate 19 is attached to the second base material 16 and is welded to a lining material or a clad material 17 that can be welded to the second metal 13.

Therefore, it is easy to join the lining material or the clad plates 15 and 17 attached to the base materials 14 and 16, and the joined portions can be formed as flat as possible, so that the fluid resistance is small, It has the effect of not hindering the operation of the plant.

[Brief description of drawings]

FIG. 1 is a perspective view of a clad material.

FIG. 2 is a perspective view of a strip plate formed by cutting a clad material.

FIG. 3 is a cross-sectional view showing a joint portion of the present invention.

FIG. 4 is a cross-sectional view showing a joint portion of a conventional clad material.

FIG. 5 is a cross-sectional view showing a joint portion of a conventional clad material.

FIG. 6 is a cross-sectional view showing a joint portion of a conventional clad material.

[Explanation of symbols]

1,14 First base material 2,4,15,1
6 Clad Material 3,16 Second Base Material 5,20 Spacer 6 Joint Material 7 First Metal 8 Second Metal 9,10 Joint 11 Clad Plate 12 First Metal 13 Second Metal 18 Explosive Weld Joint 19 strips.

Claims (1)

[Claims] 1. A clad plate is formed by explosion-bonding a first metal and a second metal that cannot be welded to the first metal,
The clad plate is cut in a direction orthogonal to the explosion-bonded joint to form a strip plate, and the first metal of the strip plate is attached to the first base material and can be welded to the first metal. While welding with the lining material or the clad material, the second metal of the strip plate is attached to the second base material, and is welded with the lining material or the clad material that can be welded to the second metal. A method for joining clad materials made of dissimilar metals that are not weldable.