JP2011088180A - Welding flux and welding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a beautiful weld zone by improving flowability while not only the surface of a melting part is protected from air oxidation by shutting off air in a weld zone with liquid flux and vaporization flux, and but also the surface of the melting part is protected by causing the flux components react with the melting part with welding heat. <P>SOLUTION: The highly strong and beautiful weld zone is obtained by preventing oxidation of a melting part while shutting off air from a welding surface by applying the liquid flux on the welding surface with or blowing against the weld zone with a compound shield gas which is formed by vaporizing the liquid flux in a vaporizer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a welding method for welding while protecting a welded portion using a liquid flux or a vaporized flux. Use liquid flux or vaporized flux alone, or mix vaporized flux with shielding gas such as argon, helium or carbon dioxide to use as composite shielding gas to block the air in the welded part or fluidity of the molten part It is related to improving the flow rate and obtaining a clean weld surface. The present invention is coated arc welding, TIG welding, MIG welding, MAG welding, carbon dioxide arc welding, submerged arc welding, electroslag welding, electrogas arc welding, electric resistance welding, high frequency contact resistance welding, high frequency induction resistance welding, high frequency induction pressure welding It can be used for welding and joining such as laser welding and electron beam welding.

The inventor of the present application described in Japanese Patent Application No. 2008-287820 (see Patent Document 1) “Gas Cutting Vaporization Flux”, Japanese Patent Application No. 2008-104825 (see Patent Document 2), “Liquid Flux Vaporizer”, Japanese Patent Application No. 2008-. No. 178420 (see Patent Document 3) invented “Liquid Flux Manufacturing Method and Apparatus”, and Japanese Patent Application No. 2008-270435 (see Patent Document 4) invented “Liquid Flux Manufacturing Method, Manufacturing Apparatus and Liquid Flux”. The above invention is used as a flux for preventing or removing dross that adheres to the cut surface when metal is gas-cut, or for brazing the metal, but also in the field of metal joining such as welding and pressure welding. Invented a method that can be utilized as

Semi-automatic welding using shield gas includes MAG welding, MIG welding, carbon dioxide arc welding and the like. There is TIG welding as a welding method that does not automatically supply wires but uses shield gas. In these weldings, the shielding gas is mainly used for the purpose of preventing oxidation of the weld surface, forming a bead shape, stabilizing the arc, and the like.

For example, in coated arc welding, a core wire made of mild steel or low alloy steel is coated with a coating material, and the arc generated from the core wire is shielded with the gas generated from the coating material, and nitrogen and oxygen in the atmosphere enter the weld. In addition to preventing this, the components of the covering material serve as deoxidation refining of weld metal and slag to form a bead shape (see Patent Document 5).

There is a method of MIG welding using a flux-cored wire for arc welding in which a steel outer shell is filled with flux, using Ar as 96% or more and the balance of CO2 or O2 as a shielding gas (see Patent Document 6). ).

A method for MIG welding nickel and a nickel alloy using a gas shield in at least a part of a welding region, the gas shield containing 0.05 to 0.5% by volume of CO2 and the balance being argon There is a MIG welding method that is a gas mixture (see Patent Document 7).

Double gas shield / multiple wire supply system that welds by continuously feeding multiple wires as a filler material to the arc generation site while forming a double gas shield around the tungsten electrode There is TIG welding (see Patent Document 8).

Shielding gas is also used in the fields of electrogas arc welding, electric resistance welding, high frequency contact resistance welding, high frequency induction resistance welding, and high frequency induction pressure welding. For example, in the process of forming a band material, butting the short part and electro-welding the end part to make a pipe, a taper shape is given to the end part before the electro-sealing welding, There is a method for manufacturing an electric resistance welded tube characterized in that a non-oxidizing gas is sprayed onto the end portion that is being heated (see Patent Document 9).

Covered arc welding, submerged arc welding and electroslag welding with a coated welding rod have a function of shielding gas that shields with the gas generated when the flux melts in addition to the function of protecting the weld from the air with molten flux. Therefore, it can be said that the welding method does not directly use the shielding gas but applies the function of the shielding gas. TIG (Tungsten Inert Gas) welding, MIG (Metal Inert Gas) welding, MAG (Metal Active Gas) welding, carbon dioxide arc welding, electric resistance welding, high-frequency contact resistance welding, high-frequency induction resistance welding, high-frequency induction pressure welding are directly performed with shield gas It is the welding method which shields it. The shield gas is used as a mixed shield gas in which gases such as carbon dioxide (CO2), argon (Ar), and helium (He) are mixed in a single gas or a mixer. Examples of the mixed shielding gas include a mixed gas of argon and carbon dioxide (Ar + CO2), a mixed gas of argon, carbon dioxide and helium (He) (Ar + CO2 + He), a mixed gas of carbon dioxide and nitrogen (N2) (CO2 + N2), and the like. The mixed shield gas is separated and used in the order of helium, nitrogen, carbon dioxide, and argon in order of specific gravity, and is mixed and used within a range close to the weld base material (within 10 m to 15 m).

The purpose of the shielding gas in gas shielded arc welding is mainly to prevent oxidation and stabilize the arc by shielding the welded part from air. In MAG welding, carbon dioxide (CO2), which is cheap, is often used as a shielding gas, but argon (Ar) may be mixed with carbon dioxide to reduce sputtering. MIG welding is also used for welding metals such as aluminum and titanium, which are easily oxidized and nitrided, non-ferrous metals, and stainless steel. Usually, 2% oxygen or 5% carbon dioxide gas is used to stabilize the arc and prevent poor fusion and blowholes, as in the case of welding with shielding with a pure inert gas such as argon and stainless steel. May be used in combination. However, when Ar + CO2-based shielding gas is used in MIG welding of stainless steel, an oxide film is formed on the entire bead surface, so in order to prevent poor fusion, slag entrainment, bead shape deterioration, etc. It was necessary to remove the slag oxide film on the bead surface with a grinder or the like. In TIG welding, an inert gas such as argon (Ar) or helium (He) is used to weld with a welding material having almost the same component as the base material component. In addition, when shield gas is used in electric resistance welding, high frequency contact resistance welding, high frequency induction resistance welding, and high frequency induction pressure welding, the main purpose is to prevent oxidation by shielding the weld from air.

Japanese Patent Application No. 2008-287820 Japanese Patent Application No. 2008-104825 Japanese Patent Application No. 2008-178420 Japanese Patent Application No. 2008-270435 JP 2008-188600 A JP 2007-296535 A JP 2002-137062 A JP-A-11-58017 JP 2007-307607 A

"Mechanical Engineering Handbook", Japan Society of Mechanical Engineers, 1973, P17-61 "Welding work reader", Nikkan Kogyo Shimbun, 1976, P2-P25

The main purpose of shield gas and mixed shield gas is to maintain the arc normally and shield the welded and melted parts from the air, but complete shielding is difficult and an oxide film is formed on the bead surface. As a result, poor fusion, slag entrainment, and bead shape deterioration occurred. For this reason, it has been necessary to remove the slag-like oxide film on the bead surface with a grinder or the like as appropriate in multilayer welding or the like. In the present invention, by using a composite shielding gas in which a vaporizing flux is mixed with a shielding gas, in addition to the purpose of shielding an arc from normalization and welding and melting parts from the air, the welding and melting parts are coated and protected, In addition to preventing oxidation of the welded portion and the melted portion, the fluidity of the melted portion is improved to prevent poor fusion, slag entrainment, and bead shape deterioration.

The first solution is that at least two of atoms such as alkali metal, alkaline earth metal, halogen, B, C, N, O, Si, P, S, Cl, Zn, and Se are bonded. A welding method is characterized in that a liquid flux produced by dissolving an electrolyte made in a solvent such as alcohol or acetone is applied to a welded portion and welded.

A second solving means is a welding method in which the vaporized flux obtained by vaporizing the liquid flux is mixed with a shield gas or a mixed shield gas obtained by mixing a plurality of shield gases and welded while spraying a composite shield gas generated on the welded portion. is there.

A third solution is a welding method in which the liquid flux and the vaporization flux are PH 6.8 to PH 7.2.

A fourth solving means is for welding wherein the amount of the electrolyte and the solvent of the liquid flux is adjusted, the electrolyte is appropriately deposited, and the liquid flux is made into a colloidal flux, a gel flux, a sol flux, or a powder flux. It is flux.

A fifth solution is that the liquid flux is obtained by dissolving borax (Na2B4O7) and boric acid (H3BO3) in a solvent such as alcohol or acetone, and further using potassium borofluoride (KBF4), acidic potassium fluoride ( KHF2) is dissolved, and Na is 8.0 to 9.0%, K is 5.0 to 6.0%, B is 17.0 to 18.0%, and H is the weight% of the electrolyte. This welding flux is blended so that 2.0 to 3.0%, O is 50.0 to 60.02%, F is 7.0 to 8.0%, and the total is 100%.

A sixth solution is that the liquid flux is obtained by dissolving borax (Na2B4O7), boric acid (H3BO3), and boron oxide (B2O3) in a solvent such as alcohol or acetone, and the weight percent of the electrolyte. Formulated so that Na is 8.0 to 9.0%, B is 26.0 to 27.0%, H is 1.0 to 2.0%, and O is 63.0 to 64.0%. It is a welding flux whose total is 100%.

According to a seventh solution, the liquid flux may be cryolite (Na3AlF6), sodium silicofluoride (NaSiF6), acidic potassium fluoride (KHF2), potassium borofluoride (KBF4), boron in a solvent such as alcohol or acetone. Sand (Na2B4O7) and boron oxide (B2O3) are dissolved, and K is 6.0 to 7.0%, Na is 10.0 to 11.0%, Si is 5.0% by weight% of the electrolyte. -6.0%, Al 1.0-2.0%, B 12.0-13.0%, H 0.1-1.0%, O 28.0-29.0%, It is a welding flux that is blended so that F is 34.0 to 35.0% and the total is 100%.

The eighth solving means is that the vaporization flux is obtained by blowing the shield gas or the mixed shield gas into the liquid flux filled in the vaporizer to vaporize the liquid flux, and the vaporizer is the liquid This is a welding method in which a tank part for filling a flux, an air supply pipe for blowing the shield gas or mixed shield gas, and an exhaust pipe for sending the composite shield gas to the weld part are provided.

The effects of the first solution are as follows. (1) The welding surface is shielded from air by preventing the oxidation of the melted portion by applying the liquid flux to the welding surface in advance. (2) The liquid flux is melted at a high temperature. Since the surface tension of the molten metal is reduced, the fluidity is improved and a clean weld surface can be obtained.

The effects of the second solving means are as follows. (1) The welding surface can be shielded from air and oxidation of the melted portion can be prevented. (2) Various characteristics can be obtained by adding various gases to the composite shield gas in which carbon dioxide (CO2) + vaporized flux is mixed. For example, when helium (He) is added to carbon dioxide (CO2) + vaporization flux, the voltage is increased. In general, carbon dioxide alone is 30 to 32 V when argon is added to 24 to 25 V. When argon (Ar) gas is added to carbon dioxide (CO2) + vaporization flux, a non-oxidized color of the deposited metal can be obtained. When nitrogen (N2) is added to carbon dioxide (CO2) + vaporization flux, the hardness of the built-up portion can be increased. Adding nitrogen to the normal hardened buildup increases the hardness by 10-20%. (3) The conventional shield gas of 100% carbon dioxide gas cannot be completely prevented because it is separated into carbon monoxide and oxygen by CO2 → CO + O, but welding with composite shield gas is a component of vaporized flux. When Na or B is contained in the glass, a thin glassy film is brought into contact with the melted portion to protect the surface of the melted portion, so that the oxidation of the buildup portion can be completely prevented. Further, in MIG welding, the molten part becomes a high temperature of 4000 ° C. at the maximum, and Na and B in the composite shield gas enter the molten droplets, and these protect the surface of the molten part as a glassy film in the vicinity of 800 to 1000 ° C. For making beautiful carbides. Therefore, the hardness of the high alloy build-up in the conventional MIG welding is about Hv 900 to 950, but when the composite shield gas is used, the hardness of about Hv 950 to 1000 can be obtained with certainty. (4) The yield and hardness are improved, and the hardness becomes a crackless weld overlay, and even when subjected to an impact load, the scale-like peeling as seen in the conventional high alloy overlay is eliminated. (5) Gas nitridation is also possible by mixing a compound shield gas that frequently produces N2 gas such as ammonia (NH3). Further, if the composite shield gas is mixed with ammonia (NH 3) and hydrogen sulfide (H 2 S), sulfur nitride deposition can be performed.

The effect of the third solution is that since the liquid flux and vaporization flux are neutral or nearly neutral, even if the liquid flux is applied to the welding surface or the vaporization flux is sprayed, the welding surface is not oxidized. Is improved.

The effect of the fourth solution is that by changing the concentration of the solvent of the liquid flux, the liquid flux changes to colloidal, sol, gel, and powder, so select the optimum welding flux when applying to the welding surface. it can. Colloidal flux can suppress dripping when applied to the welding surface. Sol flux, gel flux and powder flux can be mixed with the welding material and welded. Further, the welding powder flux can be sealed in a wire of TIG welding, MIG welding, MAG welding or carbon dioxide arc welding. Further, it can be used by being mixed with a flux of a covered arc welding rod, a flux of submerged arc welding, a flux of electroslag arc welding, or the like.

The effect of the fifth and sixth solving means is the composition of a flux for producing a neutral liquid flux, and a neutral vaporized flux can be produced by vaporizing this liquid flux.

The effect of the seventh solution is an example of a composition for changing the liquid flux into a colloidal flux, a gel flux, a sol flux, or a powder flux, and manufacturing various types of fluxes by adjusting the amount of the solvent. Can do.

The effect of the eighth solving means is a method of generating a composite shield gas in which a shield gas or a mixed shield gas and a vaporized flux are mixed. (1) A composite shield gas can be easily generated from a liquid flux. ) By simply incorporating a vaporizer into a conventional shield gas line or mixed shield gas line, it can be easily changed to a composite shield gas line. (3) By using composite shield gas welding using this device, the welding surface is cut off from the air and melted. The oxidation of the part is prevented, and the vaporization flux is melted at a high temperature to reduce the surface tension of the molten metal, so that the fluidity is improved and a clean weld surface is obtained.

The welding flux according to the present invention can be used as a liquid or gas flux, covering arc welding, TIG welding, MIG welding, MAG welding, carbon dioxide arc welding, submerged arc welding, electroslag welding, electrogas arc welding, electrical resistance. It can be widely used for metal welding and joining such as welding, high frequency contact resistance welding, high frequency induction resistance welding, and high frequency induction pressure welding.

Equipment explanatory drawing at the time of semi-automatic welding using a composite shield gas.

The first solution is that at least two of atoms such as alkali metal, alkaline earth metal, halogen, B, C, N, O, Si, P, S, Cl, Zn, and Se are bonded. This is a welding method in which a liquid flux produced by dissolving a manufactured electrolyte in a solvent such as alcohol or acetone is applied to a welded portion and welded. The liquid flux can be applied by brush or spray. The liquid flux should be applied immediately after forming the groove to minimize oxidation of the weld.

Arc welding is a high temperature of 4000 ± 50 ° C. The melting point and boiling point of the main flux dissolved in the liquid flux are as follows. Borax (Na 2 B 4 O 7) has a melting point of 741 ° C. and a boiling point of 1575 ° C., boron oxide (B 2 O 3) has a melting point of 577 ° C. and a boiling point of 1500 ° C., boric acid (H 3 BO 3) has a melting point of 180 ° C. and a boiling point of 800 ° C. The melting point of potassium (KBF4) is 200 ° C., the boiling point is 800 ° C., the melting point of acidic potassium fluoride (KHF 3) is 225 ° C., the melting point is 800 ° C., the melting point of potassium fluoride (FK) is 860 ° C., and the boiling point is 1676 ° C. Sodium fluoride (NaF) has a melting point of 995 ° C. and a boiling point of 1705 ° C., and barium fluoride (BaF) has a melting point of 1280 ° C. and a boiling point of 2460 ° C. Since the melting point of iron is 1500 ± 30 ° C., it can be used as a liquid flux for welding if the boiling point of the flux is 1500 ± 30 ° C. or higher. The amount of fluoride is determined by the amount of carbide, but the carbide and fluoride such as KF, NaF and BaF are replaced according to the amount of hardly soluble carbide such as MoC and WC. Various elements are contained in the liquid flux in order to improve weldability. For example, Na is effective in preventing oxidation of the melted part, and B has an effect of improving the fluidity of the melted part and lowering the surface tension, ensuring pinhole reduction in the buildup part and smoothness of the buildup hardened layer. It is effective to do.

The liquid flux of the present invention includes a "gas cutting vaporization flux" in Japanese Patent Application No. 2008-287820 (see Patent Document 1) and a "liquid flux production method and apparatus thereof" in Japanese Patent Application No. 2008-178420 (see Patent Document 3). ”And Japanese Patent Application No. 2008-270435 (refer to Patent Document 4), it can be easily manufactured using the method invented in“ Method and apparatus for manufacturing liquid flux and liquid flux ”.

This means is covered arc welding, TIG welding, MIG welding, MAG welding, carbon dioxide arc welding, submerged arc welding, electroslag welding, electrogas arc welding, electric resistance welding, high frequency contact resistance welding, high frequency induction resistance welding, high frequency induction pressure welding It can be applied to welding and joining such as laser welding and electron beam welding.

A second solving means is a welding method in which the vaporized flux obtained by vaporizing the liquid flux is mixed with a shield gas or a mixed shield gas obtained by mixing a plurality of shield gases and welded while spraying a composite shield gas generated on the welded portion. is there. The shielding gas includes carbon dioxide (CO2), argon (Ar), helium (He), and the like. Examples of the mixed shield gas include a mixed shield gas (Ar + CO2) of argon and carbon dioxide, a mixed shield gas (Ar + CO2 + He) of argon, carbon dioxide and helium (He), and a mixed shield gas (CO2 + N2) of carbon dioxide and nitrogen (N2). There is. The vaporized flux can be generated by vaporizing a liquid flux with a shielding gas or mixed gas. The concentration of the solid flux in the liquid flux can be dissolved up to about 30%, but a concentration of about 20% is desirable in order to reduce the work of removing the residual flux after welding.

Arc welding is a high temperature of 4000 ± 50 ° C. The melting point and boiling point of the main flux dissolved in the vaporized flux are as follows. Borax (Na 2 B 4 O 7) has a melting point of 741 ° C. and a boiling point of 1575 ° C., boron oxide (B 2 O 3) has a melting point of 577 ° C. and a boiling point of 1500 ° C., boric acid (H 3 BO 3) has a melting point of 180 ° C. and a boiling point of 800 ° C. The melting point of potassium (KBF4) is 200 ° C., the boiling point is 800 ° C., the melting point of acidic potassium fluoride (KHF 3) is 225 ° C., the melting point is 800 ° C., the melting point of potassium fluoride (FK) is 860 ° C., and the boiling point is 1676 ° C. Sodium fluoride (NaF) has a melting point of 995 ° C. and a boiling point of 1705 ° C., and barium fluoride (BaF) has a melting point of 1280 ° C. and a boiling point of 2460 ° C. Since the melting point of iron is 1500 ± 30 ° C., if the boiling point of the flux is 1500 ± 30 ° C. or more, it can be used as a vaporizing flux for welding. The amount of fluoride is determined by the amount of carbide, but the carbide and fluoride such as KF, NaF and BaF are replaced according to the amount of hardly soluble carbide such as MoC and WC. Various elements are contained in the vaporized flux in order to improve weldability. For example, Na is effective in preventing oxidation of the melted part, and B has an effect of improving the fluidity of the melted part and lowering the surface tension, ensuring pinhole reduction in the buildup part and smoothness of the buildup hardened layer. It is effective to do. A vaporized flux is mixed with shield gas or mixed shield gas in a volume ratio of 1 to 30% to form a composite shield gas. The composite shielding gas is usually welded while using 10 to 30 liters / minute. Desirably, it is about 18-20 liters / minute.

The conventional carbon dioxide shield is heavily oxidized, so there are many cracks and one or more cracks have occurred for a weld length of 10 to 15 mm, but with composite shield gas, one occurs for a weld length of 100 mm. It is a grade to do. The hardness can secure a level of about Hv 900 to 1300. Various characteristics can be obtained by adding various gases to the composite shield gas in which carbon dioxide (CO2) + vaporization flux is mixed. For example, when helium (He) is added to carbon dioxide (CO2) + vaporization flux, the voltage is increased. In general, carbon dioxide alone is 30 to 32 V when argon is added to 24 to 25 V. When argon (Ar) gas is added to carbon dioxide (CO2) + vaporization flux, a non-oxidized color of the deposited metal can be obtained. When nitrogen (N2) is added to carbon dioxide (CO2) + vaporization flux, the hardness of the built-up portion can be increased. Adding nitrogen to the normal hardened buildup increases the hardness by 10-20%. MIG welding is also used for welding metals that easily oxidize and nitride, such as aluminum and titanium, non-ferrous metals, and stainless steel. Usually, stainless steel is used when welding while shielding with pure inert gas such as argon. In order to stabilize the arc and prevent poor fusion and blowholes as in the case of the above, there are cases where about 2% oxygen or about 5% carbon dioxide gas is mixed and used. By using a composite shield gas in which a vaporizing flux is mixed with such a shield gas for MIG welding, functions of non-oxidation color welding and hardness-up welding can be added. Since the composite shield gas is separated in the order of helium, nitrogen, carbon dioxide, and argon due to the difference in specific gravity, it is usually preferable to mix and use within a range as close as possible to the weld base metal (within 10 m to 15 m).

This means mainly TIG welding, MIG welding, MAG welding, carbon dioxide arc welding, submerged arc welding, electroslag welding method, electrogas arc welding, electric resistance welding, high frequency contact resistance welding, high frequency induction resistance welding, high frequency induction pressure welding, laser Applicable to welding and joining such as welding.

A third solution is a welding method in which the liquid flux and the vaporization flux are PH 6.8 to PH 7.2. The liquid flux of the present invention includes a "gas cutting vaporization flux" in Japanese Patent Application No. 2008-287820 (see Patent Document 1) and a "liquid flux production method and apparatus thereof" in Japanese Patent Application No. 2008-178420 (see Patent Document 3). ”And Japanese Patent Application No. 2008-270435 (refer to Patent Document 4), it can be easily manufactured using the method invented in“ Method and apparatus for manufacturing liquid flux and liquid flux ”. Since the liquid flux or the vaporized flux obtained by vaporizing the liquid flux often exhibits strong acidity, there is a problem that the groove portion rusts when the liquid flux is applied to or sprayed on the groove portion formed by machining. Oxidation of the groove portion can be prevented by neutralizing the liquid flux and vaporization flux.

A fourth solving means is for welding wherein the amount of the electrolyte and the solvent of the liquid flux is adjusted, the electrolyte is appropriately deposited, and the liquid flux is made into a colloidal flux, a gel flux, a sol flux, or a powder flux. It is flux. By adjusting the amount of the solvent with respect to the electrolyte, the liquid flux can control the partial precipitation and the complete precipitation state from the state in which the electrolyte is completely dissolved. If the solvent is completely evaporated, it can be finally deposited as a powder flux.

A fifth solution is that the liquid flux is obtained by dissolving borax (Na2B4O7) and boric acid (H3BO3) in a solvent such as alcohol or acetone, and further using potassium borofluoride (KBF4), acidic potassium fluoride ( KHF2) is dissolved, and by weight%, Na is 8.0 to 9.0%, K is 5.0 to 6.0%, B is 17.0 to 18.0%, and H is 2. The welding flux is blended so that 0 to 3.0%, O is 50.0 to 60.02%, F is 7.0 to 8.0%, and the total is 100%. The liquid flux of the present invention includes a "gas cutting vaporization flux" in Japanese Patent Application No. 2008-287820 (see Patent Document 1) and a "liquid flux production method and apparatus thereof" in Japanese Patent Application No. 2008-178420 (see Patent Document 3). ”And Japanese Patent Application No. 2008-270435 (refer to Patent Document 4), it can be easily manufactured using the method invented in“ Method and apparatus for manufacturing liquid flux and liquid flux ”. Borax is PH8, but most of the fluxes such as boric acid and fluoride are acidic, but the pH of the liquid flux can be controlled to about PH7 by precisely combining the amounts of the respective components.

A sixth solution is that the liquid flux is obtained by dissolving borax (Na2B4O7), boric acid (H3BO3), and boron oxide (B2O3) in a solvent such as alcohol or acetone, and Na is contained by weight%. 8.0 to 9.0%, B is 26.0 to 27.0%, H is 1.0 to 2.0%, and O is 63.0 to 64.0%. Is a welding flux with 100%. The liquid flux of the present invention includes a "gas cutting vaporization flux" in Japanese Patent Application No. 2008-287820 (see Patent Document 1) and a "liquid flux production method and apparatus thereof" in Japanese Patent Application No. 2008-178420 (see Patent Document 3). ”And Japanese Patent Application No. 2008-270435 (refer to Patent Document 4), it can be easily manufactured using the method invented in“ Method and apparatus for manufacturing liquid flux and liquid flux ”.

According to a seventh solution, the liquid flux may be cryolite (Na3AlF6), sodium silicofluoride (NaSiF6), acidic potassium fluoride (KHF2), potassium borofluoride (KBF4), boron in a solvent such as alcohol or acetone. Sand (Na2B4O7) and boron oxide (B2O3) are dissolved, K is 6.0 to 7.0%, Na is 10.0 to 11.0%, Si is 5.0 to 6% by weight. 0.0%, Al 1.0-2.0%, B 12.0-13.0%, H 0.1-1.0%, O 28.0-29.0%, F It is a flux for welding which is blended so as to be 34.0 to 35.0% and the total is 100%. The liquid flux of the present invention includes a "gas cutting vaporization flux" in Japanese Patent Application No. 2008-287820 (see Patent Document 1) and a "liquid flux production method and apparatus thereof" in Japanese Patent Application No. 2008-178420 (see Patent Document 3). ”And Japanese Patent Application No. 2008-270435 (refer to Patent Document 4), it can be easily manufactured using the method invented in“ Method and apparatus for manufacturing liquid flux and liquid flux ”.

In the eighth solution, the vaporized flux is vaporized by blowing the shield gas or the mixed shield gas into the liquid flux 20 filled in the vaporizer 10, and the vaporizer 10 converts the liquid flux 20 into the liquid flux 20. A tank part 11 for filling, an air supply pipe 12 for blowing the shield gas or mixed shield gas, and an exhaust pipe 13 for sending the composite shield gas to the welded part are provided. By blowing shield gas or mixed shield gas into the liquid flux 20 filled in the vaporizer 10, the liquid flux 20 is vaporized to become a vaporized flux. At the same time, it is mixed with the shield gas or mixed shield gas to become a composite shield gas. As the vaporizer, the one invented in Japanese Patent Application No. 2008-104825 can be used, and the use of the vaporizer 10 according to the present invention makes it difficult for the flux component to deposit on the hose or the pipe.

FIG. 1 shows an example in which a composite shield gas is used for semi-automatic welding. Semi-automatic welding includes carbon dioxide arc welding, MIG welding, and MAG welding. Carbon dioxide arc welding uses only carbon dioxide as the shielding gas. MIG welding uses a mixed shielding gas that is 100% argon or a few percent oxygen in argon. MIG welding uses a mixed shielding gas of argon and carbon dioxide as the shielding gas. A generally used shield gas is 80% argon and 20% carbon dioxide. Although TIG welding is not semi-automatic welding, it is a matter of course that the present invention can be applied to welding using shield gas.

In welding using shield gas, such as semi-automatic welding, the shield gas is supplied from the cylinder 30 to the vaporizer 10 via the gas flow rate regulator 40. Since the shield gas is blown into the liquid flux 20 by the air supply pipe, the liquid flux 20 is stirred and vaporized by the shield gas to become a vaporized flux. The vaporized flux is mixed with the shielding gas to form a composite shielding gas, which is discharged from the exhaust pipe 13 and supplied to the welding torch 50. A wire 61 is supplied from the wire feeder 60 to the welding torch 50. A cable 71 for supplying electric power to the wire 61 from the welding machine 70 is disposed up to the welding torch 50. Although FIG. 1 shows an example of the equipment flow of semi-automatic welding, it goes without saying that there are various other combinations of equipment. Needless to say, there are various patterns for the method of supplying the composite shielding gas, including welding and joining methods other than automatic welding.

By the method shown in Japanese Patent Application No. 2008-270435, borax (Na2B4O7) and boric acid (H3BO3) are dissolved in alcohol, and potassium borofluoride (KBF4) and acidic potassium fluoride (KHF2) are dissolved as fluorides. To produce a liquid flux with a concentration of 20% at PH7. Borax is PH8, but most fluxes such as boric acid and fluoride are acidic. The weight percent of the electrolyte element dissolved in alcohol is Na (8.4%), K (5.4%), B (17.2%), H (2.5%), O (59.2). %) And F (7.3%), which are 100% by weight in total. This vapor flux is filled in the vaporizer of Japanese Patent Application No. 2008-104825, and a composite shield gas vaporized by blowing carbon dioxide gas is used to butt weld a high alloy steel with a thickness of 10 mm provided with both grooves. An excellent weld was obtained. Yield and hardness were improved, and it became a crackless weld overlay, and even when subjected to an impact load, scale-like peeling as seen in conventional high alloy overlay was eliminated. In the build-up welding using the main welding, gas nitriding can be performed by mixing a compound shield gas that frequently produces N2 gas such as ammonia (NH3). Further, if the composite shield gas is mixed with ammonia (NH 3) and hydrogen sulfide (H 2 S), sulfur nitride deposition can be performed. However, exhaust equipment and an air line mask are required.

By the method shown in Japanese Patent Application No. 2008-270435, borax (Na2B4O7), boric acid (H3BO3), and boron oxide (B2O3) are dissolved in alcohol to produce a liquid flux having a concentration of 20% with PH7. The weight percent of the electrolyte element dissolved in alcohol is 8.4% for Na, 26.6% for B, 1.5% for H, 63.6% for O, and 100% by weight. . The vaporizer of Japanese Patent Application No. 2008-104825 is filled with this liquid flux and butt-welded using a composite shield gas that is vaporized by blowing argon gas, with both grooves provided at a thickness of 10 mm. An excellent weld was obtained. Yield and hardness were improved, and it became a crackless weld overlay, and even when subjected to an impact load, scale-like peeling as seen in conventional high alloy overlay was eliminated.

By the method shown in Japanese Patent Application No. 2008-270435, cryolite (Na3AlF6), sodium silicofluoride (NaSiF6), acidic potassium fluoride (KHF2), potassium borofluoride (KBF4), borax (Na2B4O7) in alcohol Boron oxide (B2O3) is dissolved to produce a 20% liquid flux with PH7. The weight percent of the electrolyte element dissolved in alcohol is 6.76% for K, 10.84% for Na, 4.83% for Si, 1.96% for Al, 12.83% for B, and H for 12.83%. 0.36%, O is 28.2%, and F is 34.2%, which is 100% by weight in total. When this liquid flux was applied to the weld surface of SS400 and butt welded with a coated arc welding rod, an excellent weld was obtained.

The present invention is used for metal arc welding, TIG welding, MIG welding, MAG welding, carbon dioxide arc welding, electrogas arc welding, electroslag welding, electric resistance welding, high frequency contact resistance welding, high frequency induction resistance welding, high frequency induction pressure welding, etc. Can do.

10: Vaporizer 11: Tank 12: Air supply pipe 13: Exhaust pipe 20: Liquid flux 30: Cylinder 40: Gas flow controller 50: Welding torch 60: Wire supply device 61: Wire 70: Welding machine 71: Cable 80: Mother Material

Claims (8)

Alcohol is an electrolyte formed by combining at least two kinds of atoms such as alkali metal, alkaline earth metal, halogen, B, C, N, O, Si, P, S, Cl, Zn, and Se. A welding method characterized in that a liquid flux produced by dissolving in a solvent such as acetone or the like is applied to a welded portion and welded. A welding method comprising welding a vaporized flux obtained by vaporizing the liquid flux with a mixed shield gas mixed with a shield gas or a plurality of shield gases while spraying a composite shield gas on a welded portion. The welding flash according to claim 1 or 2, wherein the liquid flux is PH 6.8 to PH 7.2. The amount of the electrolyte of the liquid flux and the amount of the solvent are adjusted, and the electrolyte is appropriately deposited to make the liquid flux into a colloidal flux, a gel flux, a sol flux, or a powder flux. The welding flux according to claim 3. The liquid flux is obtained by dissolving borax (Na2B4O7) and boric acid (H3BO3) in a solvent such as alcohol and acetone, and further dissolving potassium borofluoride (KBF4) and acidic potassium fluoride (KHF2) as fluorides. Na is 8.0 to 9.0%, K is 5.0 to 6.0%, B is 17.0 to 18.0%, and H is 2.0 to 3.0% by weight% of the electrolyte. %, O is 50.0 to 60.02%, F is 7.0 to 8.0%, and the total is 100%. The welding flux according to claim 3 and claim 4. The liquid flux is obtained by dissolving borax (Na2B4O7), boric acid (H3BO3), and boron oxide (B2O3) in a solvent such as alcohol or acetone, and Na is 8.0 to 9 by weight% of the electrolyte. 0.0%, B is 26.0-27.0%, H is 1.0-2.0%, O is 63.0-64.0%, and the total is 100%. The welding flux according to claim 1, claim 2, claim 3, and claim 4. The liquid flux includes cryolite (Na3AlF6), sodium silicofluoride (NaSiF6), acidic potassium fluoride (KHF2), potassium borofluoride (KBF4), borax (Na2B4O7), boron oxide in a solvent such as alcohol or acetone. (B2O3) is dissolved, K is 6.0 to 7.0%, Na is 10.0 to 11.0%, Si is 5.0 to 6.0% by weight% of the electrolyte, Al 1.0 to 2.0%, B 12.0 to 13.0%, H 0.1 to 1.0%, O 28.0 to 29.0%, F 34.0 to 35 The welding flux according to claim 1, claim 2, claim 3, and claim 4, characterized by being blended so as to be 0.0%, and the total of which is 100%. The vaporized flux is obtained by blowing the shield gas or the mixed shield gas into the liquid flux filled in a vaporizer to vaporize the liquid flux, and the vaporizer is a tank for filling the liquid flux. 4. An air supply pipe for blowing the shield gas or the mixed shield gas and an exhaust pipe for sending the composite shield gas to the welded portion are provided. The welding method according to claim 5, claim 6, and claim 7.

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