JPH06297192A - Manufacture of sheet for cladding by welding - Google Patents

Abstract

PURPOSE:To manufacture a metallic material, which is used superposed on a base material at the time of cladding by welding, with less penetration into the base material, and in such a manner that the scattering of dust and the generation of odor at the time of welding are eliminated so that the material is used without impairing the working environment, and that suitable slag is formed to perform welding with a satisfactory bead appearance even by a carbon dioxide gas arc welding. CONSTITUTION:A powdery mixture P consisting of metallic powder for cladding by welding, water glass and polysaccharide is scattered on the surface of a web-shaped sheet material 1, a web shaped protective sheet material 8 made of glass paper is superposed thereon, then passed through an electric heating furnace 13 to convert the water glass into a hydrated water glass, thereby both sheet materials 1, 8 and powdery mixture P are adhered and integrated to manufacture the sheet for clad welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sheet for overlay welding used for overlay welding on a steel material.

[0002]

2. Description of the Related Art Conventionally, there are many methods such as arc welding and submerged arc welding for welding. However, when overlay welding is performed using a wire, the weld metal and the surface portion of the base metal are melt-mixed during welding. Since the metal to be deposited is different from the intended component, it is necessary to build up in multiple layers in order to make the deposited metal exhibit the required strength.

It is known that a powdery metallic material for filling gap is separately used for overlay welding, but this material is scattered from the surface of the base metal to be welded by the impact of arc during welding. Therefore, it is not preferable in terms of work. Therefore, submerged arc welding and band arc welding are performed by dispersing flux on the metal powder.

[0004]

However, in the above-mentioned build-up welding, the same portion is welded by overlapping many times, so that a large amount of heat is required and the distortion of the welded portion becomes large.

To build up a relatively large area by overlay welding, as described above, a method in which flux is sprinkled over the metal powder is used, but the work efficiency is poor, dust is generated, and the strong odor of oxides is generated. Occurs and the working environment is impaired, which is a problem. Further, when the flux is used, there is a problem in that when carbon dioxide arc welding is performed, slag is not generated at all, so that the beat appearance cannot be formed well.

If a plate-like or block-like filler is used in place of the above metal powder, no dust will be generated. However, if such a metal material is used during welding, a large amount of heat is required and a lot of base metal is used. Since the amount of heat is absorbed, the metal material and the base material are melt-mixed in a large amount, and the overlay welding layer cannot be formed with the intended metal composition.

In view of the above, the present invention solves the above-mentioned problems, and a metal material used in advance for overlaying a base material when overlay welding is performed is less likely to be melted into the base material, and scattering of dust or a bad odor is caused during welding. It is an object of the present invention to manufacture such that it can be used without causing the occurrence of heat generation and does not impair the working environment, and that an appropriate slag is formed so that the beet appearance can be improved and the welding can be performed by carbon dioxide gas arc welding.

[0008]

In order to solve the above-mentioned problems, in the present invention, a metal powder for welding and water glass are sprinkled on the surface of a web-shaped sheet material, and a web-shaped protective sheet material is spread thereon. Then, the above-mentioned water glass was made into a water-water water glass, and both sheet materials and the above-mentioned metal powder were adhered and integrated to produce a sheet for overlay welding.

Further, the metal powder for welding, water glass and polysaccharides are sprinkled on the surface of the web-shaped sheet material, and a web-shaped protective sheet material containing a slag-forming component is superposed thereon, and then the above-mentioned water glass. It is also possible to manufacture a sheet for build-up welding by making both of the sheet materials and the metal powder into an integral body by vitrifying the above with water and water.

The details will be described below.

The web-like sheet material or protective sheet material used in the present invention is not particularly limited as long as it is a material capable of adhering and holding weld metal powder, and organic fiber,
Inorganic fibers, synthetic resin sheets, etc. can be used. Among these, examples of the inorganic fiber include glass fiber, carbon fiber, metal fiber, rock wool and the like. Examples of the organic fibers include cotton, hemp and other natural fibers, polyamides, polyesters, etc., but animal proteins, chlorides, etc. are not preferred because they produce a bad odor when heated. The form of these fibers may be either non-woven fabric or knitted fabric.

The components of the metal powder for welding used in the present invention are appropriately prepared so as to be welded to the base material to be welded with an appropriate strength, and are not particularly limited. In addition to iron, non-ferrous metals, various alloys, carbides such as chromium carbide and tungsten carbide, graphite, and the like, these may be powdered. The particle size of these metal powders is also not particularly limited, but is, for example, 200 to 5 in average particle size.
Good results have been obtained using a film having a diameter of 00 μm.

The water glass used in the present invention is alkali-based.
A well-known silicate glass may be used.
O ₂ 23-37, Na ₂ O 6-18, Fe ₂ O ₃ <
Those of 0.03 to 0.05 are generally used. This substance dissolves in water and alcohols, but if the water content is adjusted to 10 to 30% by heating, drying, etc., it becomes viscous water water and becomes a flexible solid.

Examples of the polysaccharide in the present invention include starch, cellulose, glycogen, alginic acid, glucose and the like. These are useful as a masking agent and as a bonding aid because they alleviate the pungent odor of metal oxides when oxidized during welding.

Such a polysaccharide is blended in an amount of 1 to 5 parts by weight with respect to 100 parts by weight of the metal powder. Because, if the amount of the polysaccharide is less than 1 part by weight, the desired effect as a binding aid cannot be obtained. On the other hand, when the amount is more than 5 parts by weight, the porous portion becomes large when decomposed by welding heat and shrinks during welding to reduce the adhesiveness to the base material.

Examples of the slag forming component contained in the above-mentioned protective sheet material include CaO, Al ₂ O ₃ and SiO. The slag forming material is dispersed in the protective sheet material,
The protective sheet itself may be contained by being dissolved or physically retained, and may be a protective sheet itself as long as it is a non-woven fabric or a woven fabric made of glass fibers.

The thickness of the overlay welding sheet made of such a material is suitably 8 mm or less. If the thickness exceeds 8 mm, the amount of heat taken up by the sheet during welding increases, and the amount of heat to the base material becomes insufficient, resulting in poor welding. Further, even if the welding current is increased to increase the heat input as in the case of arc welding, the distortion of the welded portion becomes large, which is not preferable.

[0018]

According to the method for manufacturing the overlay welding sheet of the present invention,
Using water glass as a binder, deposit a sufficient amount of welding metal powder on the surface of the sheet material so that the required thickness is obtained,
Since the protective sheet material is bonded and integrated with the water glass on the above, it is possible to manufacture a build-up welded sheet which is wide and has a sufficiently thick wall and which does not scatter metal powder during welding. Since the metal powder has a high heat transfer efficiency and is rapidly melted during welding, it is possible to minimize the melting and mixing of the metal sheet material and the base material.

If the water glass is used in combination with a polysaccharide, the polysaccharide masks the odor of metal oxide during welding. When a slag forming material is added to the protective sheet material, a slag is appropriately generated even when carbon dioxide gas arc welding is performed, and a beet appearance is improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A manufacturing method of an embodiment will be described below with reference to the drawings.

As shown in FIG. 1, in the embodiment, a web-shaped sheet material 1 made of glass fiber woven cloth is fed from a roll body 2 and a frame-shaped container 3 having upper and lower end faces opened at a constant speed of 2 to 5 m / min. It was advanced along the lower end surface of. Then, a hopper 4 was arranged above the frame-shaped container 3, and a mixing / supplying device 5 with a stirrer was further arranged above it.
The mixing container supply device 5 contains a mixed powder P in which 1 to 5 parts by weight of starch is mixed with 100 parts by weight of a metal powder composed of C 5% by weight, Cr 25% by weight, and the balance Fe. Was continuously supplied to the hopper 4.

A gap 6 for supplying the mixed powder P to the surface of the sheet material 1 with a uniform thickness is formed in the lower portion of the side surface of the frame-shaped container 3 on the downstream side in the traveling direction of the sheet material 1. The gap 6 is configured so that the downstream side surface of the frame-shaped container 3 can be slid in the vertical direction, and the gap 6 can be adjusted to supply the mixed powder P with a required thickness. There is.

In the next step, the water glass aqueous solution L of water / water glass = 100/10 to 20 (weight ratio) was sprayed from above the sheet material 1 with the sprayer 7 at a rate of 200 g / m ² .

Next, the protective sheet material 8 made of glass paper is fed out from the roll body 9 and is advanced at the same speed as the sheet material 1 to be attached onto the mixed powder P, and the plurality of rolls 10, 11 and 12 are used to adjust the thickness. The pressure was applied so that it would be 8 mm or less.

Then, this was passed through an electric heating furnace 13 set at 80 to 120 ° C. so as to be heated for 5 minutes,
A sheet A for overlay welding was obtained by cutting into a desired size with a cutting machine 14.

In the obtained overlay welding sheet A, the added water glass is converted to Japanese water and water glass to act as a binder and an adhesive, and is flexible and excellent as a curved welding material. In addition, there was no generation of dust and odor when used in the overlay welding, the beet appearance was good, and the overlay welding work could be performed efficiently.

[0027]

As described above, according to the present invention, metal powder for overlay welding is adhered to the surface of a sheet material using water glass as a binder, and a protective sheet material is bonded and integrated with this using water water glass. Since it is manufactured, it is possible to continuously and efficiently manufacture a sheet applicable to overlay welding having a relatively thick wall and a wide width. In the manufactured overlay welding sheet, the weld metal contains powdery weld metal, and the proportion of the weld metal that melts into the base metal during welding is small and dust is not scattered. When the polysaccharide is added together with the weld metal powder to produce the product, it is possible to obtain a product that does not generate a bad odor and does not impair the welding work environment.
Further, since a product to which a protective sheet containing a slag forming agent is adhered can be manufactured, there is an advantage that a product having a good beet appearance and a good appearance can be obtained by carbon dioxide arc welding.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram schematically showing an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 sheet material 2 roll body 3 frame type container 4 hopper 5 mixing supply device 7 sprayer 8 protective sheet material 13 electric heating furnace P mixed powder L water glass aqueous solution A sheet for overlay welding

Claims (2)

[Claims] 1. A web-shaped sheet material is sprayed with a metal powder for welding and water glass, a web-shaped protective sheet material is superposed thereon, and then the water glass is made into a water-water-water glass. A method for manufacturing a sheet for overlay welding, which comprises integrally bonding a material and the metal powder together. 2. A metal sheet for welding, water glass, and a polysaccharide are sprinkled on the surface of a web-shaped sheet material, and a web-shaped protective sheet material containing a slag-forming component is superposed thereon.
Next, a method for producing a build-up welding sheet, which comprises making the above-mentioned water glass into a water-water water glass and integrally adhering both sheet materials and the above metal powder.