JPH1133733A - Titanium thin plate coating method for metal base surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable easy and secure coating with a thin titanium plate; wherein the thin titanium plate is placed on a titanium-clad steel frame, which is framed around a metal base so that the steel-side of the frame faces the metal material, lapping part of the frame and metal base is joined with indirect resistance seam welding, and then seam portions of the titanium-clad steel frame are sealed by arc welding. SOLUTION: A steel pile is made of the metal base 1. A face of the metal base 1, where is a part equivalent to a sea splash belt, is framed with the titanium clad steel frame 2 so that a steel side of the frame 2 faces the metal base 1, and they are fillet welded. Since it is a steel to steel fillet welding, an arc welding is easy and the titanium clad steel plates are joined securely and firmly. Since the thin titanium plates 3 are placed on a titanium contained member 2b of the titanium-clad steel frame 2 and are resistance-seam-welded, the metal base 1 can be easily sealed and material cost is reduced. By arc- welding the titanium-contained member 2b of the seam portions 4a, 4b of the titanium-clad steel frame 2, it is completely joined so that entering of water, etc., is prevented to retard occurrence of corrosion.

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 titanium substrate on a surface of a metal substrate when the titanium substrate is used as a coating material for corrosion protection of metal structures such as marine structures, bridges, and various plants. .

[0002]

2. Description of the Related Art Conventionally, corrosion protection of a metal structure is generally performed by applying an organic / inorganic paint. In this method, repainting is required in several years, so maintenance is complicated, and repainting is dangerous. For this reason, in recent years, a method has been used in which a metal having corrosion resistance over a long period of time, such as copper, copper alloy, stainless steel, a Ni—Cu alloy, or the like, alone or clad with ordinary steel, is adhered to the surface of a metal base material to cover it. I have.

[0003] A titanium plate or a titanium alloy plate is used for a metal structure installed in a particularly severe place in a corrosive environment. When titanium is welded to a steel base material as a metal base material, Fe is contained in the weld metal. Melts in a large amount, and a large amount of an intermetallic compound of Fe or Ti or a compound such as TiO ₂ or TiN is generated, and the weld metal is embrittled. Therefore, the titanium plate is used as titanium clad steel clad on ordinary steel or attached to the surface of a metal substrate with an adhesive or an adhesive.

[0004] Among them, in the case of titanium clad steel, after the steel portion of titanium clad steel is welded to the metal base material (steel) of the metal structure, the titanium mixture can be welded to each other. Although it can be ensured, in the case of coating a complicated metal structure in which the surface of the metal substrate is changed into a curved surface, molding is difficult due to high rigidity, and adhesion to the metal substrate surface is deteriorated. In addition, the production cost of titanium clad steel is high. In the method of attaching the titanium plate to the surface of the metal substrate using an adhesive or an adhesive, the titanium plate can be thinned, but since the adhesive or the adhesive comes into contact with light, outside air, water, etc. Therefore, there is a problem that the titanium plate is liable to peel off due to the progress of deterioration.

[0005]

As means for solving the above-mentioned problems, as shown in FIG. 1 of JP-A-8-71763, a titanium clad steel frame 2 is fixedly welded to a metal base material 1 by welding. There has been proposed a method of stacking titanium thin plates 3 and sealing the lap portion by indirect resistance seam welding (hereinafter referred to as “resistance seam welding”). According to this method, it is possible to cover a structure having a complicated shape with a titanium thin plate at a low cost, and since the titanium thin plate does not peel off, it is maintenance-free and can be protected for a long period of time.

However, the titanium clad steel frame 2 has connecting portions 4a and 4b, and water and the like intrude from the connecting portions 4a and 4b to corrode the inside. Therefore, resistance seam welding is performed after the joining portions 4a and 4b are welded. However, the joining portions 4a and 4b of the titanium clad steel frame 2 may have unevenness and may not be completely joined. Also, in order to avoid this, after performing arc welding using a melting material of titanium or a titanium alloy, it takes a great deal of labor to polish flat as well as the surface of the titanium composite material of titanium clad steel, which requires high cost. Become.

Accordingly, an object of the present invention is to provide a simple, inexpensive and reliable method for coating a metal substrate surface with a titanium thin plate.

[0008]

SUMMARY OF THE INVENTION The gist of the present invention is as follows. (1) Fillet welding by placing a titanium clad steel frame on the surface of a metal substrate such that the steel material side is on the metal substrate side. And
A titanium thin plate is placed on the titanium clad steel frame, and an overlapped portion of the titanium clad steel frame and the titanium thin plate is joined by indirect resistance seam welding, and then a joining portion of the titanium clad steel frame is seal-joined by arc welding. A method for coating a thin titanium plate on a surface of a metal substrate, characterized in that: (2) The arc welding of the joint portion of the titanium clad steel frame is characterized in that a seal joining is performed from the end of the titanium mixture of the titanium clad steel frame or the indirect resistance seam weld to the indirect resistance seam weld at the other end. The method for coating a thin titanium plate on the surface of a metal substrate according to the above (1).

(3) The method according to (1) or (2), wherein the titanium thin plate is indirectly resistance seam welded to the titanium clad steel frame in parallel with the connecting portion of the titanium clad steel frame, and then seal-joined by arc welding. A method for coating a thin titanium plate on the surface of a metal substrate according to the above item.

(4) The above (1), wherein an anticorrosive is applied to the surface of the metal substrate in the titanium clad steel frame.
(2) or (3) The method for coating a thin titanium plate on the surface of a metal substrate according to (2) or (3).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for coating a thin titanium sheet on a metal substrate according to the present invention will be described, which corresponds to a seawater splash zone of a steel pipe pile, which is a metal substrate that is driven into the sea and forms the basis of an offshore structure. The case where a thin portion is coated with a titanium thin plate will be described as an example. In this example, as shown in FIG. 1, a titanium clad steel frame 2 is provided on a surface of a portion corresponding to a seawater splash zone of a steel pipe pile 1 (hereinafter, referred to as a “metal substrate 1”), and the steel material side is a metal base. The metal substrate 1 and the titanium clad steel frame 2 are fillet welded with the frame placed so as to be on the material 1 side. As shown in FIG. 2, the fillet welded portion 8 is formed by steel-steel fillet welding, so that arc welding is easy, and the titanium clad steel frame 2 is securely and firmly attached to the surface of the metal substrate 1. Can be joined.

After placing the titanium thin plate 3 on the titanium mixture 2b of the titanium clad steel frame 2 of the titanium clad steel frame 2,
Since the resistance seam welding is performed, the metal substrate 1 can be easily sealed, and the material cost can be reduced. In addition, for example, the connecting portion 4a
If there is a gap, as shown in FIG. 6, the same titanium clad steel or titanium plate as the titanium clad steel frame 2 is inserted as a spacer 7 into the gap, and then resistance seam welding is performed.

After joining the titanium clad steel frame 2 and the titanium thin plate 3 by resistance seam welding, the titanium cladding 2b of the connecting portions 4a and 4b of the titanium clad steel frame 2 can be completely welded by arc welding to form a seal joint. Water or the like intrudes from the connecting portions 4a and 4b of the clad steel frame 2 and the inner metal substrate 1
Does not corrode.

The arc welding of the titanium composite material 2b is performed as shown in FIG.
In the case where the connecting portion 4a of the titanium clad steel frame 2 is at the coating end of the titanium thin plate 3 as shown in FIG.
From the end of the titanium mixture 2b to the resistance seam weld 5 along the joint 4a of the titanium clad steel frame 2. In addition, as shown in FIG. 3, when the titanium thin plate 3 is coated on both ends of the connecting portion 4b of the titanium clad steel frame 2, the titanium clad from one resistance seam weld 5 to the other resistance seam weld 5 at the other end. This is performed along the connecting portion 4b of the steel frame 2.

As shown in FIGS. 4 and 5, before the joints 4a and 4b of the titanium clad steel frame 2 are arc-welded, a resistance seam is connected to the titanium clad steel frame 2 in parallel with the joints 4a and 4b. The titanium sheet 3 outside the welded portion 5 is resistance seam-welded to the titanium clad steel frame 2 to arc-weld the extreme end of the titanium sheet 3 opened between the resistance seam welds 5a. Titanium clad steel frame 2
When the joining portions 4a and 4b exposed on the surface of the titanium clad steel frame 2 are further arc-welded, the end of the titanium thin plate 3 is not turned up by the arc heat, so that the appearance is good and the seal joining is surely performed. it can.

Connecting portions 4a and 4b of titanium clad steel frame 2
The titanium thin plate 3 is not connected to the titanium clad steel frame 2 by resistance seam welding in parallel with the connecting portions 4a, 4a of the titanium clad steel frame 2.
When b is arc-welded, the titanium thin plate 3 is turned up by the arc heat, and in some cases, the resistance seam weld between the titanium clad steel frame 2 and the titanium thin plate 3 may be separated. Further, by coating or filling an anticorrosive agent 6 such as an epoxy resin, a urethane resin, a mortar, and an adhesive rubber in the titanium clad steel frame 2, the titanium thin plate 3 is coated.
When the titanium thin plate 3 does not rise and the surface of the titanium thin plate 3 is broken, it is more advantageous in terms of secondary corrosion protection, and the titanium clad steel frame 2 can be enlarged, which is economical.

The joining of the titanium thin plate 3 to the titanium clad steel frame 2 by resistance seam welding is performed by using a resistance seam welding machine having a counter roller electrode 9 as shown in FIG.
By performing two rows (welded portions 5 and 5b) at the same time, the reliability of seal joining can be further increased. In this case, the arc welding of the connecting portion 4a of the titanium clad steel frame 2 is preferably performed up to the resistance seam welded portion 5b inside the titanium clad steel frame 2, as shown in FIG.

Further, the connecting portion 4a of the titanium clad steel frame 2
Is preferably welded from the fillet weld 8 on the steel material side 2a of the titanium clad steel frame 2 to the titanium composite material 2b using Ag or an Ag alloy as a melting material.

Titanium clad steel frame 2 used in the present invention
Has a thickness of 3 to 5 mm, a thickness of the titanium mixture 2 b of 2 mm or less and a width of 20 to 100 mm, and the size of the frame is arbitrarily determined according to the size and shape of the metal substrate 1 and the width and length of the titanium thin plate. . The titanium thin plate 3 preferably has a thickness of 0.3 to 0.6 mm.

[0020]

EXAMPLE An experiment was conducted in which the present invention was adopted and a titanium sheet 3 was coated on a portion corresponding to a seawater splash zone of a steel pipe pile 1 using an example of a coating method as shown in FIGS. The steel material 2a side of the titanium clad steel frame 2 is applied to the surface of the steel pipe pile 1, and the steel pipe pile 1 is fillet-welded to the steel pipe pile 1 by gas shield arc welding, and the anticorrosive is applied to the surface of the steel pipe pile 1 in the titanium clad steel frame 2. Adhesive rubber is attached as 6 and titanium thin plate 3
Is joined to the titanium clad steel frame 2 by resistance seam welding, and the titanium thin plate 3 is resistance seam-welded to the titanium clad steel frame 2 in parallel with the connecting portions 4a and 4b of the titanium clad steel frame 2 to form the titanium clad steel frame 2. Titanium mixture 2b of connecting portions 4a and 4b was seal-welded by arc welding (TIG). Finally, the portion of the steel material 2a and the titanium composite material 2b of the fillet welded portion 8 at the end of the connecting portion 4a of the titanium clad steel frame 2 was welded using an Ag alloy. Experimental conditions and evaluation results will be described below.

[Experimental conditions] Test material Steel pipe pile Material: JIS A5525 SKK400 Outer diameter: 1524 mm Plate thickness: 19 mm Titanium clad steel frame Plate thickness: 5 mm (Titanium mixture: 1 mm) Plate width: 50 mm Titanium thin plate Material: JIS H4600 Type 1 TP270C Plate thickness: 0.4mm Plate width: 995mm Corrosion inhibitor Adhesive rubber Indirect resistance seam welding Current: 2000A Pressure: 59kgf Speed: 60cm / min Arc welding (TIG) of the joint of titanium clad steel frame Current: 85A.

In the titanium clad steel frame 2, the steel pipe pile 1 is divided into three parts in the circumferential direction at both the upper part and the lower part. In addition, steel pipe piles 1 are placed vertically in 5 rows and 3 rows in length.
m, the outer circumference of the upper and lower parts in the circumferential direction is gas-shielded arc welding using a steel wire for full circumference welding, and has a leg length of 3 mm.
mm, fillet welding was performed on the inner and circumferential frames in the circumferential direction, and bead welding was performed with a bead length of about 10 mm and an interval of about 200 mm.

The resistance seam welding of the eight titanium thin plates 3 to the titanium clad steel frame 2 is performed by a resistance seam welding machine having a counter roller electrode 9 as shown in FIG. 8 and as shown in FIG. 7 and FIG. Performed in two places.

The connecting portion 4 of the titanium clad steel frame 2
a, a resistance seam welding machine having a pair of roller electrodes 9 in parallel with 4b is used to perform resistance seam welding to the inside of the two rows of resistance seam welds 5, 5b, and then titanium clad steel frame by TIG arc welding. The titanium joint material 2b of the two connecting portions 4a and 4b was seal-welded. In the case of the joint portion 4a of the titanium clad steel frame 2, the arc welding was performed six times in the vertical direction from the end of the titanium mixture 2b of the titanium clad steel frame 2 to the inner resistance seam weld portion 5b along the joint portion 4a. .
In the case of the joint 4b, the inner resistance seam weld 5
The operation was performed at 16 points in the upper and lower directions along the connecting portion 4b between the points b and b. As described above, in the portion of the steel pipe pile 1 corresponding to the seawater splash zone,
Through the titanium clad steel frame 2, the titanium thin plate 3 was completely sealed and joined.

[0025]

According to the method of the present invention for coating a thin titanium plate on the surface of a metal substrate, a titanium clad steel frame is placed on the surface of the metal substrate so that the steel material side is on the metal substrate side. Arc welding with a wire is possible, and a titanium clad steel frame can be securely and firmly joined to a metal base material surface. Since the titanium thin plate is resistance seam welded to the titanium clad steel frame, the surface of the metal substrate can be easily sealed with the titanium clad steel frame and the titanium thin plate, and the material cost can be reduced.

Since the connecting portion of the titanium clad steel frame and the titanium thin plate are sealed by arc welding after the resistance seam welding of the titanium clad steel frame and the titanium thin plate, the surface of the metal substrate can be completely covered with the titanium clad steel frame and the titanium thin plate. In addition, there is no possibility that water or the like intrudes from the connecting portion of the titanium clad steel frame and the metal base material is corroded. In addition, after the resistance seam welding is performed along the connecting portion of the titanium clad steel frame, the titanium composite material at the connecting portion is arc-welded, so that the titanium thin plate is not turned up by the arc heat.

Further, by disposing the anticorrosive in the titanium clad steel frame, the titanium thin plate can be adhered to the surface of the metal substrate, and the corrosion resistance of the metal substrate is further improved. As described above, a titanium thin plate can be simply, reliably, and economically coated on the surface of a metal substrate via a titanium clad steel frame.

[Brief description of the drawings]

FIG. 1 is a partially cutaway three-dimensional explanatory view showing an example of coating a thin titanium plate on a steel pipe pile according to the present invention.

FIG. 2 is an enlarged three-dimensional explanatory view of a part A in FIG. 1;

FIG. 3 is an enlarged front explanatory view of a portion B in FIG. 1;

FIG. 4 is an explanatory front view showing an example of resistance seam welding at a connecting portion of the titanium clad steel frame of FIG. 2;

FIG. 5 is an explanatory front view showing an example of resistance seam welding at a connecting portion of the titanium clad steel frame of FIG. 3;

FIG. 6 is an explanatory front view showing an example of insertion of a spacer into a gap at a connecting portion of a titanium clad steel frame according to the present invention.

FIG. 7 is an explanatory plan view showing an example of two-row resistance seam welding in the present invention.

FIG. 8 is an explanatory side sectional view showing an example of a resistance seam welding machine and an example of two-row resistance seam welding used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal base material (steel pipe pile) 2 Titanium clad steel frame (titanium clad steel frame) 2a Steel material part of titanium clad steel frame 2b Titanium composite material of titanium clad steel frame 3 Titanium thin plate 4a, 4b Joint of titanium clad steel frame 5, 5a, 5b Resistance seam weld 6 Corrosion inhibitor 7 Spacer 8 Fillet weld 9 Counter roller electrode

Claims (4)

[Claims] Claims: 1. A titanium clad steel frame is provided on a metal substrate surface,
Place the frame so that the steel material side is the metal substrate side, fillet weld it, place the titanium thin plate on the titanium clad steel frame, and indirect resistance seam the overlapping part of the titanium clad steel frame and the titanium thin plate. A method for coating a titanium thin plate on a surface of a metal base material, wherein after joining by welding, a joining portion of the titanium clad steel frame is seal-joined by arc welding. 2. The arc welding of the joint portion of the titanium clad steel frame is performed by sealing and joining from the end of the titanium mixture of the titanium clad steel frame or the indirect resistance seam weld to the indirect resistance seam weld at the other end. The method for coating a thin titanium plate on a surface of a metal substrate according to claim 1, characterized in that: 3. The metal according to claim 1, wherein a titanium thin plate is indirectly resistance-seam-welded to the titanium-clad steel frame in parallel with the connecting portion of the titanium-clad steel frame, and then sealed by arc welding. A method for coating a titanium sheet on a substrate surface. 4. An anticorrosion agent is applied to a surface of a metal substrate in a titanium clad steel frame.
A method for coating a thin titanium plate on the surface of a metal substrate as described in the above.