JPS5914057Y2 - Clad tube - Google Patents

Description

[Detailed description of the invention] This invention is a combination of composite metals such as titanium, zirconium, niobium, tantalum, etc. and steel base metals, which cannot be welded by normal fusion welding methods. This invention relates to improvements in cylindrical, conical, and polygonal clad tubes made by winding clad plates into cylindrical shapes.

Recently, there has been a change in the selection criteria for corrosion-resistant materials, and metals with excellent corrosion resistance, such as titanium, zirconium, niobium, and tantalum, are now being used in a wide range of applications. Because it is extremely expensive, it is used clad with inexpensive metals such as mild steel, stainless steel, and copper alloys.

However, since these corrosion-resistant metals (hereinafter referred to as composite materials) cannot be welded to the above-mentioned inexpensive metals (hereinafter referred to as base metals) using normal welding methods, they can be made into clad plates by roll pressure welding, explosive crimping, etc. It is said that

However, in these cladding methods using roll pressure explosive crimping, etc., the composite tube is directly crimped onto the base material tube to form a clad tube, as shown in Figure 5, but this clad tube is long and has a large diameter. These are technically difficult to manufacture, and the thick composite cylinders also lack reliability in crimping.

On the other hand, methods for manufacturing clad plates using roll pressure welding, explosive crimping, etc. are technically established, and clad plates of any size and thickness can be obtained.
A cladding plate is created by roll pressure welding, explosive crimping, etc., and this cladding plate is rolled to form a long cladding tube with a large diameter.

Alternatively, as shown in Fig. 4, there is a method in which the base material is grooved and overlay welded, and the butt part of the composite material is completely crimped by explosive crimping with a metal equivalent to the composite material. However, it requires explosions and special techniques, making it difficult to implement on-site.

Therefore, as shown in FIG.
Weld the butt part of the composite material 2 using a fitting plate 4 and a patch plate 7 using a normal welding method and perform seal welding 5 and batch welding 6 to produce the clad tube (2), or
As shown in the figure, in the same way as for the clad pipe (3), the abutting portions of the base metal 1 are welded 3b, and the composite material 2 is sealed by welding 5 using a fitting plate 4.
The clad tube II is made by doing this.

And this clad tube ■. There is no problem when a mirror surface or blind plate is welded to one or both end faces of II and used for various purposes (for example, containers), but when it is used partially inside a container, for example, as shown in Fig. 3, Clad tube I
Since there is a gap 8 between the lower surface of the fitting plate 4 and the composite material 2 on both end faces of the cladding tubes I and II, gas or liquid may enter into the gap 8 during use and the base material 1 of the clad tubes I and II may be damaged. Corroded.

Therefore, as a method to prevent this, conventionally, the gap 8 has been hermetically welded using silver or silver solder, but it is difficult to achieve a complete seal.

Therefore, a method to prevent this is to use a cladding made of the same material as the cladding shown in Figures 1 and 2 (for example, mild steel for the base material and titanium for the composite material), with the end cross section completely sealed, and with a short length. A clad cylindrical part, such as the clad cylindrical part shown in FIG.
There is a clad tube.

This clad tube is also effective when used for a specific purpose, but the cross section of the clad tube is exposed (for the time being,
(paint etc.) may cause problems depending on the exposure atmosphere, and if there is a large difference in electrode potential between the base material and composite material (see Table 1), this bond may Electrolytic corrosion often occurs selectively at interfaces.

The present invention was developed as a result of various studies aimed at solving the above-mentioned problems. Specifically, it is a clad tube made by winding a clad plate whose composite material and base material cannot be welded using normal welding methods. A base material that has better corrosion resistance than the base material of the clad board, in which all joint surfaces of the composite material and the base material are completely crimped on the end cross section, and a composite material that has corrosion resistance equal to or higher than the composite material of the clad board. For example, the base metal parts are beveled and the iron parts are overlay welded, and the composite parts are welded together by seal welding, patch welding, etc., as explained in Fig. 1. It is.

Hereinafter, the present invention will be explained in detail with reference to FIGS. 6 and 8.

FIG. 6 shows a longitudinal cross-sectional view of one embodiment of the clad tube of the present invention, and (2) shows a clad plate manufactured using mild steel as the base material 1 and titanium as the composite material 2; This is a clad tube that has been wound and welded as described in the explanation of FIG. 1 above. As shown in Fig. 4, it is made into a rectangular tube with almost the same shape as the clad tube shown in (2) by winding (bending).Then, after welding the abutting part of the base metal 1 with a groove, weld it together. The end of the material 2 is tapered, and a titanium plate is explosively crimped onto the tapered part α', so that all joint surfaces of the composite material and the base material are completely sealed.

Then, the end sections of the base metals 1 of the clad tube (3) and the clad tube part III are butt-welded 3CL, and then the composite material 2 of the clad tube (2) and the composite material 2 of the clad tube component 2 are grooved and fitted. The plate 4 is inserted, and the composite material 2 and the fitting plate 4 are seal-welded 5.

Thereafter, a patch welding plate 7 made of the same material as the composite material 2 is applied so that the seal weld portion 5, the composite material 2, and the fitting plate 4 are covered, and the plate 7 and the composite material 2 are patch-welded 6.

For example, when it is used partially on the outside of the cylindrical object 9, the tube cleanser container 9 and the base material 1 are fixed by fillet welding 10, as shown in FIG.

The clad cylindrical parts used in the present invention are usually manufactured from clad plates manufactured by explosive crimping, but depending on the combination of materials for the clad plates, they may be manufactured by an appropriate method such as friction welding. , a pipe clad manufactured by the pipe explosion crimping method as shown in FIG. 5 may be cut and used.

As explained above, the clad tube of the present invention has superior corrosion resistance than the base material of the clad tube, and because it uses a clad tube part that is completely sealed at the joint end cross section, it is especially effective as shown in FIG. By using the clad tube of the present invention, the corrosion resistance of the base material at the exposed end portion can also be improved, and corrosion resistance can be effectively imparted only to the necessary portions.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional square clad tube, Figure 2 is a cross-sectional view of a conventional circular clad tube, and Figure 3A is a cross-sectional view of the clad tube of Figure 1 incorporated into a cylindrical object. A vertical cross-sectional view of the state,
Fig. 3B is a longitudinal cross-sectional view of the clad cylinder shown in Fig. 2 installed in the container, Fig. 4 is a cross-sectional view of the rectangular clad cylinder part, and Fig. 5 is a cylindrical clad cylinder part. 6 is a longitudinal sectional view of a rectangular clad tube according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view of the clad tube of the present invention shown in FIG. 6 assembled on the outside of the cylindrical body. 8 is a perspective view of the clad tube of the present invention, and the clad tube shown in FIG.
The clad cylindrical part II shown in Fig. 4 is welded to both ends of the cylindrical part. 1...Base material, 2...Mixture material, 3...
・・Butt welding part of base material 1, 4・・Fitting plate,
5...Seal welded part, 6...Patch welded part, 7...Fitting plate, 8...Between base material 1 and fitting plate 4 Gap, 9... Cylindrical object, 10.
...Fillet weld, 11...Container.

Claims (1)

[Scope of utility model registration request] Corrosion occurs in the axial gap existing in the end cross section of the clad tube, which is made by winding a clad plate made of a combination of materials that cannot be welded using normal welding methods, and welding the butt portions. A base material with superior corrosion resistance than the base material of the clad tube, in which all joint surfaces of the composite material and the base metal are completely crimped to prevent liquid from entering, and a base material with a corrosion resistance equal to or higher than the composite material of the clad tube. A clad tube with no gaps at the end, characterized by welding clad tube parts made from a composite of corrosion-resistant materials.