JPH1053855A - Formation of coating film or cladding by utilizing low temperature metal thermal spraying technology - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable forming by cladding and restoration approximate to those in ordinary welding by utilizing a low temp. metal thermal spraying device. SOLUTION: As for a large size tank, particularly, in a bottom plate 1 at the inside, a surface-treated layer of weather resistant and corrosion resistant coating or the like in the initial stage is destroyed by the residues of the contents, condensed water or the like to produce a bottom sheet erosive part 1a. Its repair and restoration in this state are utterly impossible by cladding, backplate mending or the like by the conventional thermal spraying method and welding method. For this purpose, in the case of strict inspection conforming to the Fire Services Act or the like, it is required that the whole body of the bottom plate of the tank is cut, and it is removed by jacking up and is replaced with a separate new bottom plate, and extremely many man hours, time and cost are taken. Then, by using a low temp. metal thermal spraying device, a cladding restored part 2 can easily be obtd. by cladding by thermal spraying after prescribed pretreatment on the spot without replacing the whole body of the bottom plate, and it can be restored to the shape and dimension close to those of the original bottom plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method for forming a metal film or a buildup using a low-temperature metal spraying technique.

[0002]

2. Description of the Related Art Conventionally, there are various types of thermal spraying techniques of this kind. As is well known, gas flame type or electric arc type (including plasma type) thermal spraying is applied to metal or other material surface. On the other hand, by spraying molten metal particles at high speed, respectively, for example, weather resistance, corrosion resistance,
This is a surface treatment method for forming a film that imparts heat resistance, heat insulation, conductivity, electrical insulation, or the like.

[0003] Conventional spraying techniques of this type include 1) a wide range of target materials that can be used, 2) a wide variety of sprayed materials, and 3).
A film can be formed on a limited part of a material with a large surface area. 4)
It has various advantages such as low thermal deformation of the material, and is used for the purpose of each surface treatment.

However, on the other hand, the conventional thermal spraying technique has the following problems. That is, 1) only a relatively thin sprayed material film can be formed,
2) The adhesion strength between the film and the base material (material) is relatively low.
3) A relatively low deposition rate causes fume pollution and the like.

However, recently, it has become possible to improve the adhesion strength between the sprayed coating and the base material by using a high-speed inverter-driven arc-melting low-temperature metal spraying apparatus. By doing so, it is possible to increase the thickness of the sprayed metal integrally, that is, to “build up”. Furthermore, the metal sprayed metal wire is melted while cooling with air using computer-controlled arc heat, and is instantaneously welded with a special gun to form a molten metal coating on objects such as paper, plastic, and concrete. Became possible.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and it is an object of the present invention to solve the above-mentioned problems while retaining all the advantages inherent in the conventional thermal spraying technique. In addition to the new metal film formation that can be performed, a low-temperature metal spraying technique that can form a build-up that can be used for welding or joining two materials, which was impossible with conventional techniques of this type, is used. It aims to provide a new field of application of the method.

[0007]

Accordingly, the present invention provides a method for forming a metal film or a buildup according to any one of the following items (1) to (4) of the low temperature metal spraying technique. It is intended to achieve the above object.

(1) A metal material is melt-sprayed on a predetermined solid material using a high-speed inverter-driven arc-melting low-temperature metal spraying device to form a coating or a build-up, and further subjected to a surface treatment. A method of forming a coating or a build-up using a low-temperature metal spraying technique.

[0009] (2) The coating using a low-temperature metal spraying technique according to the above (1), wherein the coating is an arbitrary metal material coating formed on any solid material including paper or the like. Forming method.

(3) The build-up using the low-temperature metal spraying technique according to (1), wherein the build-up is a build-up of an arbitrary metal material formed on an arbitrary metal material. Method.

(4) The method for forming a build-up using a low-temperature metal spraying technique according to the above (3), wherein the build-up is used for mutual welding of two different metal materials.

[0012]

According to the method of the present invention as described above, it is possible to form or repair a build-up similar to ordinary welding or to perform low-temperature spraying on paper or the like, which is impossible with the conventional spraying technique. The range of applications can be expanded.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail based on a plurality of examples.

[0014]

【Example】

(First Embodiment) FIG. 1 shows a steel structure, for example, a large oil tank which has been extremely difficult to repair on site, using a high-speed inverter-driven arc melting low-temperature metal melting apparatus according to the present invention. Alternatively, FIG. 2 shows an example of a cross-sectional view of a part of the internal bottom plate 1 of a gas tank or the like for repairing the buildup.

In general, the inner bottom plate 1 of this kind of tank generally has an initial weather resistance due to residue of contents and condensed water.
Corrosion-resistant paint and other surface treatment layers are destroyed and are easily eroded as shown exaggeratedly in the bottom plate eroded portion 1a. Repair and repair in this state can be performed by a conventional thermal spraying method or a conventional welding method. It is impossible at all with patch plate repair, etc., and inspection standards such as the Fire Service Law are extremely strict.To pass this, cut the entire bottom plate of the tank, remove it by jacking it up, It was necessary to replace the entire bottom plate. For this reason, an extremely large number of man-hours, time and costs were required.

In contrast to the above-mentioned aspects, FIG. 1 shows that the application of the new thermal spraying technique according to the present invention makes it unnecessary to replace the entire bottom plate as in the prior art, and after performing a predetermined pretreatment on the site, A shape close to the original bottom plate 1 as shown in the overlay repairing part 2 by easily utilizing the thermal spray overlay method,
It shows the repaired state up to the dimensions.

As described above, the specifications of the structure and strength of tanks for storing this kind of dangerous goods at the time of new construction, including those at the time of repair and regeneration, are extremely strict. It is impossible with welding and other methods, and if this kind of erosion progresses as a whole, even if the old tank is demolished and dismantled to try to build a new one, it is not allowed, so on-site construction is possible according to the embodiment of the present invention The realization of such a repair method is of great significance.

(Embodiment 2) FIGS. 2A and 2B show a reinforcing bar 3 used for a concrete pier such as a road bridge.
Alternatively, a cross-sectional explanation of each main part of the steel cable (wire cable) 4 in which the surface anticorrosion films (or damaged portion repair films) 3a, 4a and the overburden portions 5, 6 for forming anchor end members are applied by the method of the present invention. It is.

(B) In the case of the wire cable 4 shown in FIG. 2 (b), if the shown overlay 6 is applied not only at the end but also at an appropriate place in the middle, the untwisting displacement of the wire strand under a large tension is prevented. can do.

(Embodiment 3) FIG. 3 is an example of an external side view showing a portion 9 in which, for example, two steel plate members 7 and 8 are applied by the spray coating method according to the present invention. Numerals 7 and 8 show an integrated state as if by a conventional welding technique.

(Embodiment 4) FIG. 4 shows not only a metal material that is usually used, but also a cross section in which a metal spray coating 11 made of, for example, aluminum or copper is applied to the surface of, for example, plain paper or a plastic sheet 10. An example is shown. This film 11 may be on both surfaces of the material 10. The above is made possible by "low-temperature metal spraying" which is one of the features of the thermal spraying method of the present invention, and can be used to impart a design effect or a dielectric effect to paper or the like. .

(Other Embodiments) The present invention is not limited to only the above-described representative embodiments, but is applied to similar coatings, overlays, and the like to obtain similar new effects. Of course, what can be obtained.

[0023]

As described above, according to the present invention,
A new low-temperature metal spraying device can be used to form metal coatings or overlays on various materials, which approximates low-temperature spraying on paper and other ordinary welding techniques that was not possible with conventional spraying techniques. Overlay molding and repair became possible, and the effective application range of thermal spraying technology could be expanded.

[Brief description of the drawings]

FIG. 1 is an example of a cross-sectional view of a rebuilding of a tank bottom plate.

FIG. 2 is a cross-sectional view of each example of a coating of a reinforcing bar and a steel cord and an overlay forming an anchor end portion.

FIG. 3 is an external side view of an example of a thermal spray overlay of a two steel plate member.

FIG. 4 is an example of a cross section in which a metal spray coating is formed on paper or the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank bottom plate 1a Bottom plate erosion part 2 Overlay repair part 3 Reinforcing bar 3a, 4a Surface anticorrosion film (or damaged part repair film) 5,6 Anchor end formation overfill part 7,8 Steel plate 9 Overlay part 10 Paper or plastic 11 Metal coating

Claims (4)

[Claims] 1. A method in which a metal material is melt-sprayed on a predetermined solid material by using a high-speed inverter-driven arc melting low-temperature metal spraying device to form a coating or a build-up, and further subjected to a surface treatment. A method for forming a coating or a build-up using a low-temperature metal spraying technique. 2. The method according to claim 1, wherein the film formation is an arbitrary metal material film formed on an arbitrary solid material including paper or the like. . 3. The method according to claim 1, wherein said build-up is a build-up of any metal material formed on any metal material. 4. The method according to claim 3, wherein the overlay is used for mutually welding two different metal materials.