JPH1128574A - Method for coating metal substrate with titanium sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a titanium sheet reliably, easily, with good workability, and with good sealing without using a holding plate for a titanium sheet or an L-shaped titanium metal fixing member. Provided is a method for coating a metal substrate with an excellent titanium sheet. SOLUTION: A fixing titanium sheet 3 for fixing a coating titanium sheet is fixed to a surface of a metal substrate 1, and an end portion of one of the coating titanium sheets 2 adjacent to both sides on the fixing titanium sheet 3 is provided. The other end of the covering titanium sheet 2a is overlapped with the end of the covering titanium sheet 2a, and the one covering titanium sheet 2 and the other covering titanium sheet 2a are continuously welded by seam welding 5, respectively. One end of one covering titanium sheet 2 is fixed on the titanium sheet 3 or fixed on the fixing titanium sheet 3 fixed thereto, and fixed by seam welding continuously or intermittently. The other end of the covering titanium sheet 2a is placed on the end of the covering titanium sheet 2 so as to overlap with the end of the covering titanium sheet 2 and continuously fixed by seam welding 5. -The metal substrate Overturn method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a metal substrate with a titanium sheet, and mainly relates to a method for preventing corrosion of steel structures such as marine structures, bridges and various plants exposed to severe corrosive environments. In particular, the present invention relates to a technology for advantageously preventing and eroding a tidal zone and a splash zone of a marine structure with maintenance free.

[0002]

2. Description of the Related Art Conventionally, corrosion prevention and antifouling of steel structures have been generally carried out by applying an organic / inorganic paint. However, repainting involving dangerous work is required every few years and is uneconomical. For this reason, metal linings that can maintain the corrosion protection quality for a long time due to maintenance free have been adopted for structures exposed to severe corrosive environments. Especially, the tidal zone and splash zone of marine structures are exposed to severe corrosive environment due to salt water, and repainting is impossible, so it is extremely advantageous to apply metal lining instead of heavy corrosion protection such as epoxy resin of the conventional method. . This metal lining is copper,
Metals with excellent corrosion resistance and antifouling properties, such as copper alloy, stainless steel, titanium, and monel, are made into thin sheets to cover the surface of the metal substrate of the structure, but these metals are expensive. Therefore, clad steel bonded to iron is often used. Among the above metals, titanium is said to have excellent mechanical strength, corrosion resistance, and antifouling properties, and is expected to have a corrosion protection life of 100 years or more, and has been evaluated as the most suitable as a coating material, The use of metal linings is increasing.

The present invention relates to means for coating a sheet of titanium metal (titanium sheet) on a metal substrate.
Titanium sheet is generally difficult to be directly welded because the metal material of the commonly used structure is iron, and even if it can be welded by a special welding method, the welded part becomes an alloy of titanium and iron and the strength, Impairs corrosion resistance. Means for coating the titanium sheet on the metal substrate include explosive bonding and a method of physically bonding using an adhesive. (Japanese Patent Application No. 5-33901
However, these methods have problems in handling of explosives and durability of the adhesive.
Recently, attention has been paid to titanium cladding using iron as a base material in order to save expensive titanium, and many techniques relating to coating of this titanium cladding have been disclosed. The use of titanium cladding can reduce the cost of titanium material because expensive titanium can be made thinner. In addition, since the clad base material is iron of the same material with respect to iron of the metal base material, welding becomes possible, but there are the following problems. That is, when the production cost of the titanium clad is high, and the thickness becomes thick and heavy, handling becomes difficult, and when the shape of the metal base material to be coated is changed, it becomes difficult to conform and the coating operation becomes difficult.

As a measure to solve these problems, the applicant has proposed a "method of attaching a metal sheet to the surface of a metal substrate" disclosed in Japanese Patent Application Laid-Open No. 7-279191. As shown in FIGS. 10 and 11, the iron portion of the sheet frame material 11 made of titanium clad is welded to the surface of the metal substrate 1 located at the outer peripheral end of the titanium sheet 10, and Titanium sheet 1 on the titanium surface of sheet frame material 11
0, and fillet welding or indirect sealing
The titanium sheet 10 is covered with a metal weld 12. The method of coating the titanium sheet 10 via the sheet frame material 11 made of titanium clad has an effect of reducing the material cost of titanium, but the operation becomes complicated, and the coated titanium sheet is also used. Since a gap (t) corresponding to the thickness of the sheet frame material 11 is formed between the sheet 10 and the surface of the metal base material 1, the gap is filled with the adhesive or the adhesive 13, and the material cost is increased. And the work becomes complicated.

[0005]

As a technique for solving such a problem, the present applicant has developed a method of coating a titanium sheet on a metal substrate, and has filed an application as Japanese Patent Application No. 9-85571. Fig. 7 (Japanese Patent Application No. 9-85571)
As shown in FIG. 1) of the drawing of No. 571, the end of a titanium sheet 10 disposed on the surface of the metal substrate 1 is fixed to the metal substrate 1 with a holding plate 14, and the outside thereof is covered with a titanium cover 15. A metal that covers the holding plate 14 and is disposed so as to overlap the titanium sheet 10, and welds the overlapped portion of the titanium cover 15 and the titanium sheet 10 by seam welding 12 by a welding machine 16 using roller electrodes 16a and 16b. This is a method of coating a titanium sheet on a substrate. This titanium sheet coating method comprises:
It is necessary to use a holding plate 14 for fixing the titanium sheet 10 to the metal substrate 1 and to prepare a titanium cover 15 for covering the titanium sheet 10 for sealing the outside of the titanium sheet 10. Various modes, such as bolting and welding, are disclosed as means for fixing the holding plate 14 to the metal base 1. However, these fixing means position bolting holes in the metal base and holding plate in advance. And complicated welding work was required.

As another mode in Japanese Patent Application No. 9-85571, as shown in FIGS. 8 and 9 (FIGS. 5 and 6 of the drawings of Japanese Patent Application No. 9-85571), the An L-shaped titanium metal fixing member 17 is fixed on the surface, and bent portions 10a and 10b of a titanium sheet 10 whose ends are bent at right angles are arranged adjacent to a vertical piece 18 of the fixing member 17 to form a pair. The vertical piece 18 and the titanium shield are
With the bent portions 10a and 10b of the gate 10 interposed therebetween, the roller electrode is pressed and run, and the vertical welding piece 19 is
Then, as shown in FIG. 9, this vertical bonding piece 19 is bent back to the metal substrate 1 side, and this is a method of coating the metal substrate with titanium sheet. Since the L-shaped titanium metal fixing member 17 protrudes outward from the metal substrate 1 and may be an obstacle, the L-shaped titanium metal fixing member 17
When the joined titanium sheet 10 is integrally bent, wrinkles are formed on the titanium sheet 10 to impair the aesthetic appearance and cause a problem that concentrated stress is easily generated.

The present invention does not use a holding plate for fixing the titanium sheet in the prior art to a metal substrate or an L-shaped titanium metal fixing member, and uses a titanium sheet.
It is an object of the present invention to provide a method for coating a metal substrate with a titanium sheet which is easy to perform with good workability, and which is flat and excellent in sealing performance.

[0008]

SUMMARY OF THE INVENTION The present invention has the following arrangement to solve the above-mentioned problems of the prior art and achieve the object.
In the method of coating a metal substrate with a titanium sheet according to the present invention, the fixing titanium sheet for fixing the coating titanium sheet is fixed to the surface of the metal substrate, and one of the adjacent titanium sheets on both sides of the fixing titanium sheet. The end of the covering titanium sheet and the end of the other covering titanium sheet are arranged in an overlapping manner, and the one covering titanium sheet and the other covering titanium sheet are continuously welded by seam welding. Either fixed to the fixing titanium sheet, or disposed on one end of the covering titanium sheet is overlapped on the fixing titanium sheet fixed,
Weld and fix continuously or intermittently by seam welding,
The end of the one coating titanium sheet is overlapped with the end of the other coating titanium sheet, and is continuously welded and fixed by seam welding.

Further, in the method of coating a metal substrate with a titanium sheet according to the present invention, the end of one adjacent titanium sheet for coating is directly fixed to the surface of the metal substrate, The other end of the covering titanium sheet is overlapped with the end of the covering titanium sheet so as to cover the fastening portion, and the other covering titanium sheet is continuously welded by seam welding. It is constituted by fixing to the one covering titanium sheet.

Further, in the method for coating a metal substrate with a titanium sheet according to the present invention, a fixing titanium sheet in which the coating titanium sheet is previously fixed to the surface of the metal substrate at a position intermediate between both ends of the coating titanium sheet. Please stop
In some cases, the covering titanium sheet is fixed to the fixing titanium sheet by seam welding continuously or intermittently. Fixing to the fixing titanium sheet at an intermediate position between both ends of the covering titanium sheet is performed either by fixing the end of the covering titanium sheet to the fixing titanium sheet or by fixing to the surface of the metal base material. Precede or do both simultaneously.

In the present invention, the fastening of the fixing titanium sheet or the covering titanium sheet to the surface of the metal substrate can be carried out by nailing a pin or screwing a screw. Here, pin nailing is performed by pinning or pin screwing using a special pin or screw that can be directly driven into the metal substrate using a dedicated air gun or the like, or by screwing screws. It can be screwed with a tapping screw or the like. Further, in the present invention, when the covering titanium sheet is fixed to the fixing titanium sheet by seam welding, the end of one adjacent covering titanium sheet and the end of the other covering titanium sheet are overlapped and arranged. When fixing to each other by seam welding, the lower part of the titanium sheet for fixing, or the lower part of the titanium sheet for covering, which is disposed in an overlapped manner, in order to properly supply current to the welding portion and obtain a reliable welding line It is preferable that a sheet-shaped material having better electric conductivity than the titanium sheet is provided in contact with the lower surface of the overlapped portion.

In the present invention, after the titanium sheet for coating is fixed on the surface of the metal base material, the surface of the metal base material and the back surface of the titanium sheet for coating are improved in order to enhance the adhesion and the anticorrosion performance of the titanium sheet for coating. It is preferable that the air in the space be provided with a suction hole and discharged. This air intake hole may be provided on either side of the metal base material and the titanium sheet for coating, or may be provided on both sides. The details are disclosed in the aforementioned Japanese Patent Application No. 9-85571, which may be referred to.

[0013]

Embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a fixing titanium sheet 3 is fixed to the surface of a metal substrate 1 with a pin (or a screw) 4 using an air gun. This fixing titanium sheet 3
The covering titanium sheet 2 is continuously fixed along the longitudinal direction by seam welding 5. Titanium sheet for fixing 3
Are fixed along both sides of the coating titanium sheet 2, 2a. A complete sealing relationship between the covering titanium sheet 2 and the fixing titanium sheet 3 with respect to the outside world is ensured. In this example, the fixing titanium sheet 3a is fixed to the surface of the metal base material 1 with a pin (or a screw) 4 using an air gun at a position intermediate the titanium sheet 2 for coating.
a, continuous along the longitudinal direction by seam welding 5,
Alternatively, the coating titanium sheet 2 is fixed intermittently. When the covering titanium sheet 2 becomes wide, it is preferable that the covering titanium sheet 2 is fixed to the metal substrate 1 in one or several places at an intermediate position in the width direction by such a method. The thickness of the titanium sheet in this example is 0.3 to 1.0 m
m and a width of about 300 mm to 2000 mm are used. For narrow ones, a method is not particularly limited in which a fixing titanium sheet is provided in the middle of claim 2, and for wide ones, a fixing titanium sheet is provided in the middle of claim 3. Preferably, a method is used.

The example shown in FIG. 2 differs from the case of FIG.
The difference is that the coating titanium sheets 2 and 2a to be adjacent to each other are fixed by seam welding to the coating titanium sheet 2 fixed on the fixing titanium sheet 3 fixed to the surface of the metal base material 1 by mutually overlapping. . In FIG. 2, the titanium sheet 3 for fixing is fixed to the surface of the metal substrate 1 with a pin (or a screw) 4 using an air gun. One of the covering titanium sheets 2 is fixed continuously or intermittently on the fixing titanium sheet 3 by seam welding 5 along the longitudinal direction. An end of the other coating titanium sheet 2a is overlapped on the end of the one coating titanium sheet 2 and continuously welded by seam welding 5 to form one and the other coating titanium sheets 2a. 2a, and fix it while maintaining the seal between each other.
Also in this example, an air hole 6 is opened in the coating titanium sheet 2, air is discharged, and the coating titanium sheet 2 is
And fix it tightly. Thus, the coating titanium sheet 2
And complete protection and protection of the metal substrate 1 by the coating.

The example shown in FIG. 3 is a case where one covering titanium sheet 2 is directly fixed and fixed to the metal substrate 1.
In FIG. 3, the end of one covering titanium sheet 2 to be adjacent to the surface of the metal substrate 1 is directly fixed. The end of the other coating titanium sheet 2a is placed on the end of the one coating titanium sheet 2 so as to overlap. The other covering titanium sheet 2a is continuously welded by seam welding 5 and fixed to one covering titanium sheet 2. Also in this example, at the intermediate position of the coating titanium sheet 2, the pin 4 fixes the fixing titanium sheet 3 a on the surface of the metal base 1.
Is fixed, and the covering titanium sheet 2 is fixed on the fixing titanium sheet 3a continuously or intermittently along the longitudinal direction by seam welding 5. In addition, in the examples of FIGS. 1 to 3, a drilling tapping screw may be used for fixing the titanium sheet to the metal base material. In this case, a large anchor force can be exhibited because the screw is screwed into the metal base material using a high-speed screwdriver.

FIG. 4 shows the fixing positions of the pins 4 or screws when the fixing titanium sheets 3 and 3a are nailed with pins (or screws) 4 or screwed with screws on the surface of the metal substrate 1. It is a figure showing an aspect.

FIG. 5A shows a pin (or screw) 4 and a washer 8 for fixing the fixing titanium sheet 3 to the metal substrate 1.
Is shown. The pin 4 can be driven into the metal substrate 1 using a high hardness steel or the like as a material and using a dedicated air gun. For example, Aerosmith's "Construction Tool" sold by Schneider Japan
Can be used. It is preferable that the washer 8 has a bowl shape or a mountain shape as shown in FIG. In this example, a pin having an R portion under the neck is used, but at the time of nailing of the pin, by using the washer,
The pin can press and fix the titanium sheet to the metal substrate 1 through the washer 8 in a wide area. In particular, the bowl-shaped or chevron-shaped washer of FIG. 5A accommodates the bulge of the metal base material generated when the pin is nailed, and the pin and the metal base material of the titanium sheet via the washer 8. 1 can be reliably pressed. FIG. 5B is an example of a drilling tapping screw.
If a drilling tapping screw is used, the anchoring force can be further strengthened at the screw portion.

FIG. 6A shows the lower surface of the fixing titanium sheet 3 where the seam welding 3 is to be performed when the covering titanium sheet 2 is fixed to the fixing titanium sheet 3 by seam welding 5 as shown in FIG. Indicates that a sheet-shaped material having better electric conductivity than a titanium sheet is provided in contact with the sheet. FIG. 6 (b) shows that the end of one covering titanium sheet 2 and the end of the other covering titanium sheet 2a to be adjacent to each other are overlapped and arranged by seam welding as shown in FIG. When fixed to each other, a sheet-like sheet having better electrical conductivity than the titanium sheet by being in contact with the lower surface of the lower coating titanium sheet 2 at the overlapping portion of the end of the coating titanium sheet 2 and the end of the coating titanium sheet 2a. This indicates that the material is provided. Here, the sheet material having better electric conductivity than the titanium sheet includes, for example, a copper sheet 9 and the like. In this manner, a sheet-shaped material having better electric conductivity than a titanium sheet, for example, a copper sheet, is disposed between the covering titanium sheet 2 and the fixing titanium sheet 3 or one of the covering sheets during seam welding. This is because a welding current is passed between the titanium sheet 2 and the other titanium sheet for coating 2a across the interface between the two sheets as shown in the figure, thereby enabling good seam welding. If there is no copper sheet,
A large amount of current flows in the upper titanium sheet, and the welding efficiency is reduced. Therefore, in the examples of FIGS. 1 to 3, it is preferable to provide, for example, a copper sheet below the seam weld of the titanium sheet.

[0019]

As described above, according to the present invention, a titanium sheet capable of exhibiting excellent corrosion resistance with respect to a steel structure exposed to a severe corrosive environment is provided at appropriate intervals on the surface of a metal substrate. Because it can be securely fixed and can be closely adhered with high quality, it greatly contributes to the improvement of the durability of the structure. In addition, a thin titanium sheet can be used, and the coating operation can be performed easily and efficiently. In addition, significant economic effects such as a reduction in cost of expensive titanium material and a reduction in coating operation cost can be obtained. In addition, a holding plate for fixing a titanium sheet to a metal substrate in the prior art or an L-shaped titanium metal fixing member is not used, and a titanium sheet for fixing or a titanium sheet for coating is directly pinned to the metal substrate. Alternatively, since the titanium sheet is fixed with the drilling tapping screw and covered, the titanium sheet can be securely and easily and well-operated, and can be tightly covered and fixed to the surface of the metal base material. In addition, since it is not necessary to bend the L-shaped titanium metal fixing member, not only the step for that can be omitted, but also wrinkles of the titanium sheet which have conventionally occurred at the time of bending do not occur, stress concentration can be eliminated, and Flat and good appearance.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 shows an embodiment of pin (or screw) positions for installing a fixing titanium sheet in the present invention. (A) shows one side, (B) shows both sides, and (C) shows a staggered embodiment.

FIG. 5 (a) shows an example of a washer used when nailing a pin according to the present invention, and (b) shows an example of a washer used when screwing a drilling tapping screw according to the present invention.

FIG. 6 shows an embodiment of a copper sheet provided on the surface of a metal substrate and in contact with the lower surface of a titanium sheet.

FIG. 7 is a diagram showing a case where a pressing plate of a titanium sheet is used in the prior art.

FIG. 8 is a view showing a case where an L-shaped titanium metal fixing member is used in the prior art.

FIG. 9 is a view showing a state in which an L-shaped titanium metal fixing member is bent in the prior art.

FIG. 10 is a diagram showing a conventional technique.

FIG. 11 is a diagram showing another prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal substrate 2, 2a Titanium sheet for covering 3 Titanium sheet for fixing 4 Pin 5 Seam welding 6 Inlet hole 7 Drilling tapping screw 8 Washer 9 Copper sheet 10 Titanium sheet 11 Sheet frame material 12 Seam welding 13 Adhesive material 14 Pressing plate 15 Titanium cover 16 Welder 16a, 16b Roller electrode 17 Titanium metal fixing member 18 Vertical piece 19 Vertical joining piece

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B23K 103: 14 (72) Inventor Hisashi Kanai 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation

Claims (6)

[Claims] 1. A fixing titanium sheet for fixing a coating titanium sheet to a surface of a metal substrate, and an end portion of one of the coating titanium sheets adjacent to both sides on the fixing titanium sheet and the other end thereof. The ends of the covering titanium sheet are arranged in an overlapping manner, and the one covering titanium sheet and the other covering titanium sheet are continuously welded by seam welding and fixed to the fixing titanium sheet, Alternatively, the end portion of one of the covering titanium sheets is placed on the fixed titanium sheet for fixing, and is fixed by continuously or intermittently welding by seam welding. The end of the other coating titanium sheet is arranged on the end so as to overlap,
A method of coating a metal substrate with a titanium sheet, wherein the metal sheet is continuously welded and fixed by seam welding. 2. An end portion of one adjacent titanium sheet for coating is directly fixed to a surface of a metal base material, and the other end of the titanium sheet for coating is placed on an end portion of the one titanium sheet for coating. Are disposed so as to cover the fastening portion, and the other covering titanium sheet is continuously welded by seam welding and fixed to the one covering titanium sheet. Method for coating metal substrate with titanium sheet 3. A fixing titanium sheet for fixing the coating titanium sheet to the surface of the metal base material is previously fixed at a position between both ends of the coating titanium sheet, and the coating titanium sheet is seam-welded. The method for coating a metal substrate with a titanium sheet according to claim 1 or 2, wherein the metal sheet is fixed to the fixing titanium sheet by welding continuously or intermittently. 4. The fastening of the fixing titanium sheet or the covering titanium sheet to the surface of the metal substrate is performed by nailing a pin or screwing a screw. A method for coating a metal substrate with the titanium sheet according to claim 3. 5. When fixing the titanium sheet for coating to the titanium sheet for fixing by seam welding, or disposing the end part of one titanium sheet for covering and the end part of the other titanium sheet for covering to be adjacent to each other. When they are fixed to each other by seam welding, the titanium sheet is in contact with the lower surface of the fixing titanium sheet, or in contact with the lower surface of the lower coating titanium sheet in the overlapping portion of the coating titanium sheet that is disposed in an overlapping manner. 5. The method for coating a metal substrate with a titanium sheet according to claim 1, wherein a sheet-like material having better electric conductivity is provided. 6. After fixing the coating titanium sheet on the surface of the metal substrate, air in the space between the surface of the metal substrate and the back surface of the titanium sheet for coating is provided with a suction hole to discharge the air. A method for coating a metal substrate with a titanium sheet according to claim 1, 2, 3, 4, or 5.