JPS6372499A - Fused flux for submerged arc welding and its production - Google Patents

Abstract

PURPOSE:To decrease hygroscopicity, to facilitate storage and control and to improve weldability by incorporating a specific ratio or above of metallic component grains having the grain size in a specific range into amorphous flux components. CONSTITUTION:Flux raw materials are adequately compounded and are heated to about 1300 deg.C to melt. While the materials are in the low-viscosity molten state of 1100-1250 deg.C, >=2.5% metallic components of 20-100 mesh grain size such as Mn, W, Co and Ni which can make chemical reaction and deoxidation reaction with a deposited metal are incorporated into said materials. The melt is thoroughly cooled to solidify after the incorporation of the metallic components therein. The solidified matter is then pulverized, by which the flux incorporated with the metallic components in the flux grains A is obtd. The weldability is improved by using the flux constituted in the above-mentioned manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a flux used in submerged arc welding, particularly a melt forming flux containing a metal component, and a method for producing the same.

[Prior Art and its Problems] Submerged arc welding is a welding method in which flux is previously spread on the surface of the welding part and a bare wire is fed into the flux. Melting flux, which is the most commonly used flux for submerged arc welding, is produced by heating and melting various mineral substances, which are flux raw materials, at around 1,300°C or higher, cooling them, and then forming them into the required particle size. It is made by crushing into
Since the composition is uniform, amorphous, and glass-like, it has almost no hygroscopicity and is easy to handle and manage during storage and use. It contains almost no metal components such as manganese, cobalt, chromium, and other alloying elements that affect the properties of the deposited metal. This is because even if metal components such as manganese or other alloying elements are added to the flux raw powder, they will burn due to the high temperature during heating and melting and almost no metal components will remain. ing.

Therefore, when using this melt forming flux, the properties of the weld metal are determined by the wires selected and used in combination depending on the material of the base material, welding conditions, etc. In other words, the addition of alloying elements to adjust the chemical composition of the weld metal is done using wire, but wire has a large manufacturing loft, and especially in the case of special wires containing metallic components of alloying elements, it is difficult to draw the wire. It is also difficult and extremely expensive.

Further, bond flux (sintered flux) is known as a submerged arc welding flux containing a metal component of an alloying element. This bond flux is made by granulating flux raw materials such as mineral substances, deoxidizers, powders of alloying elements, etc. with a bonding agent, and firing it at a temperature of 300 to 500 degrees Celsius. Although it has the advantages of being relatively easy to adjust the ingredients, Ig2 acid action, and refine the crystal structure, and has a wide range of applications,
In addition to being expensive to manufacture, it is more hygroscopic than the former, making storage and other management troublesome, and it is difficult to handle as it becomes pulverized by repeated use.

In addition, the flux regeneration method proposed by this inventor (
It is not inconceivable to use the method (Japanese Patent Publication No. 52-40892) to make the granular material of the flux component the core and attach powder of the metal component around it, but in this case, the metal component attached around the core The problem arises that the components are easily removed, difficult to handle and manage during use, and that the content of the metal component M becomes non-uniform.

In view of the above, the present invention provides a flux for submerged arc welding that retains the advantages of melt-forming flux, which is easy to use, store, and handle, and also has the advantages of bonded flux, which contains metal components of alloying elements. The present invention aims to provide a melt-forming flux that also has the following features and a method for producing the same.

[Means for Solving the Problems] As a result of various studies and examinations, the present invention has been developed by forming the metal component into powder particles of a certain specific particle size, and by using the powder particles in the cooling stage after the flux component is melted. It was discovered that if it is blown under certain conditions, it can be mixed into the flux component as it is without being burned or dissolved, and the present invention was made based on this knowledge.

That is, the melt forming flux of the present invention that solves the above problems has a particle size of 20 to
It is characterized by containing 2.5% by weight or more of 100 mesh metal component powder particles.

The second invention is a method for producing the above-mentioned melt-molded flux, in which, when the flux raw material is heated and melted and then cooled, while the flux component is still in a molten state, the molten metal of the flux component is , particle size 20-10
It is characterized by mixing 2.5% by weight or more of metal component powder grains of 0 mesh by heating them at high temperature and spraying them under high pressure, and immediately cooling and solidifying them after mixing, and pulverizing this to a predetermined particle size. It is.

[Function] The melt-forming flux of the present invention having the above-mentioned structure is mostly composed of an amorphous or glassy flux component, so the composition is uniform and there is almost no hygroscopicity, and the flux contained in this flux component is uniform. The powder particles of the metal component to be mixed are not dissolved but are partially or completely buried in the flux component, and are approximately uniform.
They are dispersed and mixed together, so they do not fall out during handling.

Moreover, since the metal components are mixed and contained in the 7-lux component, it has properties similar to bond flux, and it is possible to transfer sufficient alloy components to the weld metal, thereby making it possible to adjust the chemical composition of the weld metal. I can do it.

Further, according to the above manufacturing method of the present invention, while the flux component is still in a molten state until it is cooled and solidified after being melted,
In particular, the powder particles of the metal component with a particle size of 20 to 100 mesh are heated at high temperature and then sprayed under high pressure. easily enters the molten metal at high speed and to some extent dispersed;
It can definitely get mixed in. However, since the flux component is cooled and solidified immediately after being mixed in, the powder particles of the metal component are not burned or dissolved, and are almost uniformly mixed into the flux component.
can be mixed.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows powder-like melt-forming flux (A) according to the present invention.
(1) shows an amorphous 7 lux component that is mainly glass-like due to melting of various mineral substances that are flux raw materials, and (2) shows the amorphous 7 lux component of the flux. The metal component of the powdery alloy element mixed in component (1) is shown. This metal component (2) includes manganese, tungsten, cobalt, nickel, molybdenum,
It is made of metals of various alloying elements capable of chemically reacting and deoxidizing weld metals such as aluminum, chromium, silicon, iron, etc. It is made into powder particles with a particle size of 20 to 100 mesh, and the flux component (1 ), 2.5% by weight or more and 25% by weight or less, particularly preferably 5% by weight
It is dispersed and mixed inside and on the surface of the particle (A) at a ratio of ~13% by weight. If the content of this metal component (2) is less than the above, the chemical reaction effect during welding will not take place sufficiently, and if it is more than 25% by weight, it will not be possible to mix it uniformly in the flux component. It becomes difficult.

Further, the above flux in which the metal component (2) is mixed in the flux component (1) can be produced as follows.

FIG. 2 shows the manufacturing process. First, in the same way as conventional melt-forming flux, various flux raw materials are appropriately blended, and this is heated and melted to 1300° C. or higher. During cooling after this melting, the flux component is 1
While the flux component is still in a molten state with a relatively low viscosity at about 100°C to 1250°C, powder particles of the metal component with a particle size of 20 to 100 mesh are added to the molten flux component.
The molten metal is heated to a high temperature in advance to remove foreign substances such as water to make it more compatible with the high-temperature molten metal, and then mixed in by spraying at high pressure using an injection means using compressed air. The heating temperature of the metal component powder particles varies depending on the type of metal component, etc., but it is usually suitable to be about 500 to 600°C, and the pressure of spraying is about 8 to 10:9/cri to heat the powder particles. It is suitable because it can be easily buried in molten metal.

The above-mentioned spraying of the metal component powder particles is carried out on the outflowing molten metal near the sprue while the molten metal containing the flux component is gradually flowing out from the hot water tank to the cooling tank. When the molten metal is squeezed between a pair of rollers to form a plate and flowed, the particles attached to the surface of the molten metal can be completely pushed into the molten metal.
It can be implemented even more favorably.

After the spraying, the flux component is immediately dropped into a cooling tank to completely cool and solidify the flux component so that the powder particles of the metal component do not dissolve or precipitate. The material may be crushed and sized to an appropriate particle size.

The melt-forming flux thus obtained is the metal component (
The powder particles of 2) are buried inside the flux particles (^) or are partially buried on the surface and are dispersed and mixed throughout, making it easier to produce the melt-molded flux of the present invention. can do.

Note that if the particle size of the metal component (2) is too fine, it will melt at the heating temperature of the flux component.
Also, if the particles are too coarse, the flux component is viscous (1
), it is best to use powder particles with a particle size of 20 to 100 mesh as described above.

The melt-molded flux produced as described above has a uniform composition and almost no moisture absorption, since most of its particles (A) are composed of amorphous 7-lux components, and its storage and Easy to handle and manage during use. Moreover, not only the flux component (1) but also the metal component of the alloying element (
2), so it can be used for overlay welding just like conventional bond flux. In addition to being able to sufficiently transfer the alloy components to the IW metal, the chemical components of the weld metal can be adjusted by this flux itself, and it can be used in combination with a conventional melt-forming flux consisting only of flux components. There is no need to use a special wire containing a metal component of an alloying element, an inexpensive wire can be used, and moreover, good welding can be performed.

[Effects of the Invention] As described above, the melt forming flux of the present invention has the advantages of ease of use and management as a melt forming flux, and
It has the advantages of bonded flux containing metal components, has almost no hygroscopicity, and is much easier to use and handle during storage than bonded flux. Moreover, since the flux itself can adjust the properties and chemical composition of the weld metal, it is possible to perform dense, high-quality welding, and the weldability and application range is wide. Since there is no need to rely on wires, there is no need to use expensive wires.

Furthermore, according to the manufacturing method of the present invention, as described above, instead of blending the metal component into the flux raw material as a raw material, a specific Since the metal component is pulverized into powder with a certain particle size and heated at high temperature and mixed with high pressure, it is immediately cooled and solidified. It is possible to easily and reliably mix the melt-forming flux, which contains metal components in the amorphous 7-lux component and has the above-mentioned superior effects, compared to conventional bond type fluxes containing metal components. It can be manufactured and provided easily and inexpensively.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view showing one particle of a flux showing an example of the present invention, and FIG. 2 is a process diagram showing the manufacturing process of the flux of the present invention. (A) Particles of melt forming flux, (1) Flux component, (2) Metal component.

Claims (1)

[Scope of Claims] 1. A melt-molding flux in which metal component powder particles with a particle size of 20 to 100 mesh are added to an amorphous flux component.
．． A melt forming flux for submerged arc welding characterized by containing 5% by weight or more. 2. When cooling after heating and melting the flux raw material, while the flux component is still in a molten state, powder particles of a metal component with a particle size of 20 to 100 mesh are heated at high temperature to the molten metal of the flux component. A method for producing melt-formed flux for submerged arc welding, which comprises mixing in 2.5% by weight or more by spraying at high pressure, immediately cooling and solidifying it, and pulverizing it to a predetermined particle size. 3. The amount of metal component powder mixed with the flux component is 2.
The method for producing a melt forming flux for submerged arc welding according to claim 2, wherein the content is 5 to 25% by weight.