KR20210047092A - Welding rod for training used in hybrid welding machine - Google Patents

Abstract

The present invention relates to a welding rod for training used in a hybrid welding machine, and more particularly, to a welding rod for a hybrid welding machine, which has improved workability and can be used in various types of welding machines and exhibits high mechanical strength. The welding rod of the present invention includes an alkali metal naphthalenide-based compound.

Description

Welding rod for training used in hybrid welding machine{WELDING ROD FOR TRAINING USED IN HYBRID WELDING MACHINE}

The present invention relates to a welding rod for education used in a hybrid welding machine, and more particularly, to a welding rod for a hybrid welding machine, which has improved workability and can be used in various types of welding machines and exhibits high mechanical strength.

Welding refers to bonding of two solid materials, which are the same or different, to be bonded to each other by heating or pressing. Such welding methods include arc welding, resistance welding, and laser welding.

First, arc welding is a welding method using the heat generated by an arc by arc discharge. After melting the surface of the material and the welding part by using the heat obtained by generating an arc between the material to be welded and the welding torch, It means that the metal of the welding torch is melted and bonded to each other. In some cases, a carbon electrode or a tungsten electrode is used instead of the welding torch.

Second, resistance welding refers to a method of welding the joint by heating the joint in a molten state by using heat generated by the contact resistance of the joint that is generated when a very large current is sent to the weld, and then compressing it with physical pressure. .

Lastly, laser welding refers to a method of welding using rays with strong energy generated by induced radiation between energy levels of atoms or molecules.

Among them, arc welding is divided into inert gas arc welding and carbonic acid gas arc welding, where inert gas arc welding is again TIG (tunfsten inert gas, TIG) welding using a tungsten electrode, and metal inert using a filler material as an electrode. gas, MIG) welding.

Since the TIG welding does not use a flux and does not generate slag, it can be applied very advantageously to metals such as aluminum or magnesium alloy. In addition, since there is no transfer of molten metal from the tungsten electrode, the TIG welding has the advantage that there is no arc instability and spattering, and the workability is good and the reliability of welding quality is very high.

The welding rod used for this TIG welding is produced in the form of a solid wire. That is, after casting the master alloy according to the welding rod component system for TIG welding, it is made into a wire material, and finally a solid wire having a diameter of about 1.6 mm to about 2.4 mm is manufactured, and then straightening and cutting are performed to produce a welding rod for TIG welding. .

However, since the welding rod manufactured in this way has low mechanical strength, or even if it has high mechanical strength, the mechanical strength of the welding joint is low during actual welding, so a high-strength welding rod is manufactured using a large amount of alloy components. Actually.

However, when a large amount of alloying components as described above is included, a lot of cost and time are consumed to improve workability, such as having to go through several heat treatment processes accordingly. There is a need for a welding rod that can be used in a TIG welding machine.

Republic of Korea Patent Publication No. 10-2018-0089310

The present invention has been made to solve the above problems, and has improved workability, and can be used in various types of welding machines, while exhibiting high mechanical strength, to provide a welding rod for a hybrid welding machine.

The above and other objects and advantages of the present invention will become apparent from the following description of preferred embodiments.

The object is, iron 20 to 60 parts by weight, carbon 0.1 to 1 parts by weight, manganese 0.5 to 3 parts by weight, chromium 10 to 30 parts by weight, silicon 0.01 to 0.05 parts by weight, nickel 1 to 15 parts by weight, molybdenum 0.1 to 5 A welding rod for a hybrid welding machine comprising parts by weight, 3 to 5 parts by weight of silver, and 0.5 to 5 parts by weight of platinum, the surface of the electrode being mesopores having a diameter of 3 nm to 50 nm and nanopores having a diameter of 0.1 nm to 2 nm This can be achieved by a welding rod for a hybrid welding machine in which a large number of these are formed.

Specifically, the welding rod may further include an alkali metal naphthalenide-based compound and a water-soluble natural polymer. Preferably, the welding rod may further include 0.01 to 3 parts by weight of an alkali metal naphthalenide-based compound and 0.5 to 5 parts by weight of a water-soluble natural polymer.

Specifically, the alkali metal naphthalenide-based compound may include sodium naphthalenide, lithium naphthalenide, or potassium naphthalenide.

Specifically, the water-soluble natural polymer, chitosan, chitosan, chitosan derivatives; Dextran, dextran derivatives; Hyaluronic acid, hyaluronic acid salts, hyaluronic acid derivatives; Pectin, pectin salt, pectin derivative; Alginic acid, alginate, alginate derivatives; Agar, galactomannan, galactomannan salt, galactomannan derivatives; Xanthan, xanthan salt, xanthan derivative; Beta-cyclodextrin, beta-cyclodextrin salt, beta-cyclodextrin derivative; It may include one or more selected from the group consisting of amylose, and combinations thereof.

The present invention relates to an educational welding rod used in a hybrid welding machine, wherein the welding rod includes a plurality of mesopores with a diameter of 3 nm to 50 nm and nanopores with a diameter of 0.1 nm to 2 nm on the surface of the welding rod, thereby reducing mechanical strength. It has the effect of being able to be used for various types of welding machines by having excellent workability without the need.

In addition, the welding rod for a hybrid welding machine according to the present invention contains silver, platinum, alkali metal naphthalenide-based compounds, and water-soluble natural polymers in a specific range by weight, thereby providing a higher mechanical strength compared to a welding rod not containing the above components. It shows strength, specifically tensile strength, so that stable work can be performed during a welding action, and the impact toughness and yield strength of a weld joint during welding can be improved by using the welding rod to improve welding workability.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

Hereinafter, the present invention will be described in detail with reference to embodiments of the present invention and drawings. These examples are only illustratively presented to explain the present invention in more detail, and it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples. .

In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, and in case of conflict, the present specification including definitions The description of will take precedence.

In order to clearly describe the invention proposed in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification. And, when a certain part "includes" a certain component, this means that other components may be further included rather than excluding other components unless specifically stated to the contrary. In addition, the "unit" described in the specification means one unit or block that performs a specific function.

In each step, the identification code (first, second, etc.) is used for convenience of explanation, and the identification code does not describe the order of each step, and each step does not clearly describe a specific sequence in the context. It may be implemented differently from the order specified above. That is, each of the steps may be performed in the same order as the specified order, may be performed substantially simultaneously, or may be performed in the reverse order.

Hereinafter, embodiments and examples of the present application will be described in detail with reference to the accompanying drawings. However, it may not be limited to these embodiments and examples and drawings of the present application.

One aspect of the present application, iron 20 to 60 parts by weight, carbon 0.1 to 1 parts by weight, manganese 0.5 to 3 parts by weight, chromium 10 to 30 parts by weight, silicon 0.01 to 0.05 parts by weight, nickel 1 to 15 parts by weight, molybdenum 0.1 A welding rod for a hybrid welding machine comprising from to 5 parts by weight, 3 to 5 parts by weight of silver, and 0.5 to 5 parts by weight of platinum, wherein the surface of the electrode has mesopores of 3 nm to 50 nm in diameter and 0.1 nm to 2 nm in diameter. It provides a welding rod for a hybrid welding machine in which a number of nanopores are formed.

In an embodiment, the iron (Fe) is a major element forming a welding rod for a hybrid welding machine, and is included in an amount of about 20 to about 60 parts by weight based on the total weight of the welding rod. The content of iron can be freely changed depending on the content of other constituents except iron, but if it is included in less than about 20 parts by weight, welding using a welding rod may not be possible, and if it contains more than about 60 parts by weight, it is low at high temperature. It can show mechanical strength.

In one embodiment, the carbon (C) is an austenite stabilizing element capable of securing the strength and tensile strength of the joint to be welded during welding. When the carbon content of the welding rod exceeds about 1 part by weight of the total weight of the welding rod, the amount of carbon dioxide gas generated during welding may increase and cause defects in the joint during welding, so the content of carbon is included in about 0.1 to 1 part by weight. It is desirable.

In one embodiment, the manganese (Mn) is an element that generates austenite, and when the content of manganese is less than about 0.5 parts by weight relative to the total weight of the welding rod, it exhibits very low tensile strength at low temperatures, and about 3 weight. If it exceeds part, cracks may form at high temperatures. Therefore, the manganese should be included in an amount of about 0.5 parts by weight to about 3 parts by weight based on the total weight of the welding rod.

In one embodiment, the chromium (Cr) is an element included in about 10 to about 30 parts by weight based on the total weight of the welding rod, and the tensile strength of the welding rod may be improved as the chromium is included. However, when the chromium is included in an amount exceeding about 30 parts by weight, the mechanical strength may decrease at cryogenic temperatures, and the chromium is preferably included in an amount of about 10 to about 30 parts by weight, specifically about 23 to about 27 parts by weight.

In one embodiment, the silicon (Si) is an element added for the deoxidation effect of the joint to be welded. When the silicon is included in an amount of less than 0.01 parts by weight or more than about 0.05 parts by weight relative to the total weight of the welding rod, the impact strength may decrease at low temperatures, so the silicon is in an amount of about 0.01 to about 0.05 parts by weight, specifically about 0.02 to 0.04 parts by weight. It is preferable to be included.

In one embodiment, the welding rod for the hybrid welding machine, nickel (Ni), molybdenum (Mo), silver (Ag), and platinum (Pt) about 1 to about 15 parts by weight of nickel, respectively, about 0.1 to about 5 molybdenum Parts by weight, about 3 to about 5 parts by weight of silver, and about 0.5 to about 5 parts by weight of platinum. The nickel, molybdenum, silver, and platinum are elements included in order to improve the mechanical strength, specifically, the tensile strength of the welding rod, or to improve the impact toughness and yield strength of the weld joint when welding using a welding rod.

In one embodiment, by including the nickel, molybdenum, silver, and platinum in parts by weight as described above, while improving the mechanical strength of the welding rod itself, it is possible to more easily process the welding rod during welding, and improve the mechanical strength of the welding joint. I can.

In one embodiment, the welding rod for the hybrid welding machine may have a porous surface in which a plurality of mesopores and nanopores are formed on the surface. Mesopores are pores with a diameter of about 3 to 50 nm, and nanopores refer to pores with a diameter of about 0.1 to 2 nm.

In one embodiment, the amount of pores formed on the surface of the welding rod may have more nanopores than mesopores. Specifically, the number of nanopores may occupy about 80% or more on the surface of the porous welding rod, and the remaining about 20% may be mesopores, but the present invention may not be limited thereto.

In one embodiment, the welding rod has a porous structure including a large number of mesopores and nanopores on its surface, so that melting rapidly occurs during welding, so that the workability thereof may be excellent. In addition, since the pore size does not exceed about 50 nm, it is a nano-scale fine material, so that the tensile strength of the welding rod is not lowered, and thus improved processing can be achieved.

If a large number of macropores having a size of the pores exceeding about 50 nm are formed on the surface of the welding rod, the workability may be further improved, but the tensile strength may decrease due to the large pores, so the pores formed on the surface of the welding rod Silver is preferably macropores having a diameter of about 3 nm to about 50 nm and nanopores having a diameter of about 0.1 nm to about 2 nm. More preferably, the size of the mesopores formed on the surface of the welding rod may be about 3 to about 10 nm in diameter.

In one embodiment, the welding rod for the hybrid welding machine may further include an alkali metal naphthalenide-based compound. The alkali metal naphthalenide-based compound is for improving the mechanical strength of a welding rod for a hybrid welding machine, and is included in an amount of about 0.01 to about 3 parts by weight based on the total weight of the welding rod, so that the mechanical strength of the welding rod, specifically, tensile strength When welding using a welding rod, the impact toughness and yield strength of the welding joint can be improved.

In one embodiment, the alkali metal naphthalenide-based compound is one containing sodium naphthalenide, lithium naphthalenide, or potassium naphthalenide. I can.

In one embodiment, when lithium naphthalenide is included as the alkali metal naphthalenide-based compound, the mechanical strength of the welding rod itself for a hybrid welding machine, specifically, the tensile strength may be improved, and the welding rod is used. Thus, the impact toughness and yield strength of the weld joint may be improved during welding, but may not be limited thereto.

In one embodiment, when the alkali metal naphthalenide-based compound is included in an amount of less than about 0.01 parts by weight relative to 100 parts by weight of the welding rod, the effect of improving mechanical strength due to the addition of the alkali metal naphthalenide-based compound may be insignificant. , If included in excess of about 5 parts by weight, the mechanical strength of the manufactured welding rod or the welding joint using the welding rod may rather decrease, so the content of the alkali metal naphthalenide-based compound is about 0.01 to about 5 parts by weight compared to 100 parts by weight of the welding rod. It is preferably in parts by weight. More preferably, the content of the alkali metal naphthalenide-based compound may be about 0.01 to about 3 parts by weight, about 0.01 to about 1 part by weight, about 1 to about 5 parts by weight, or about 1 to about 2 parts by weight. have.

In one embodiment, the welding rod for the hybrid welding machine may further include a water-soluble natural polymer together with an alkali metal naphthalenide-based compound.

In one embodiment, the water-soluble natural polymer may be included in an amount of about 0.5 to about 5 parts by weight based on the total weight of the welding rod. When the water-soluble natural polymer is included in an amount of less than about 0.5 parts by weight, sufficient workability cannot be imparted to the welding rod, and when it is included in an amount exceeding about 5 parts by weight, the mechanical strength of the welding rod or the welding joint using the welding rod may rather decrease. The natural polymer is about 0.5 to about 5 parts by weight, about 0.5 to about 3 parts by weight, about 1 to about 5 parts by weight, about 1 to about 3 parts by weight, or about 3 to about 4 parts by weight based on the total weight of the welding rod. It is preferable to be included.

In one embodiment, the water-soluble natural polymer is chitosan (chitosan), chitosan salt, chitosan derivatives; Dextran, a dextran derivative; Hyaluronic acid, hyaluronic acid salts, hyaluronic acid derivatives; Pectin, pectin salt, pectin derivative; Alginic acid, alginate, alginate derivatives; Agar, galactomannans, galactomannan salt, galactomannan derivatives; Xanthan, xanthan salt, xanthan derivative; Beta-cyclodextrin, beta-cyclodextrin salt, beta-cyclodextrin derivative; And amylose (amylose, water-soluble starch) may include one or more selected from the group consisting of, but may not be limited thereto.

Specifically, the water-soluble natural polymer may be a dextran derivative. Dextran is a kind of bacterial polysaccharide that is polymerized into D-glucose as a glucose polymer decomposed by bacteria from sugar cane, and may be composed of chains of various lengths ranging from about 3 to about 2000 kDa.

In one embodiment, the dextran derivative may include acacia gum or tragacanthin, but may not be limited thereto.

In one embodiment, the welding rod for the hybrid welding machine may have a cross-section of about 1.0 mm to about 5.0 mm in diameter. If the diameter of the cross section of the welding rod is less than about 1.0 mm, a large amount of melting occurs during welding and may not function as a welding rod, and if it exceeds about 5.0 mm, the welding may not be sufficiently melted, so the diameter of the cross section of the welding rod Length is about 1.0 mm to about 5.0 mm, about 1.0 mm to about 3.5 mm, about 1.0 mm to about 2.5 mm, about 1.0 mm to about 2.0 mm, about 2.0 mm to about 2.5 mm, or about 2.5 mm to about 4.0 mm Can be Specifically, it may be about 1.5 to about 2.4 mm.

In one embodiment, the welding rod is about 20 to about 60 parts by weight of iron, about 0.1 to about 1 part by weight of carbon, about 0.5 to about 3 parts by weight of manganese, about 10 to about 30 parts by weight of chromium based on 100 parts by weight of the welding rod Parts, about 0.01 to about 0.05 parts by weight of silicon, about 1 to about 15 parts by weight of nickel, about 0.1 to about 5 parts by weight of molybdenum, about 3 to about 5 parts by weight of silver, about 0.5 to about 5 parts by weight of platinum, lithium naphthalate It may include about 0.01 to about 3 parts by weight of renide and about 0.5 to about 5 parts by weight of tragacanthine, and by including the constituents of the above parts by weight, it is possible to improve workability while maintaining high tensile strength of the welding rod itself. And, it is possible to improve the impact toughness and yield strength of the welding joint using the welding rod.

Hereinafter, the configuration of the present invention and effects thereof will be described in more detail through specific examples and comparative examples. However, the present examples are for explaining the present invention in more detail, and the scope of the present invention is not limited to these examples.

[Examples 1 to 3]

By mixing the constituents of Table 1 below to form a metal wire so that the cross-section has a diameter of 1.6 mm, the formed metal wire is subjected to surface treatment using an anodization technique, thereby producing nanopores with an average diameter of 0.5 nm and 5 A welding rod for a hybrid welding machine containing a large number of nm mesopores was prepared. According to the composition of Table 1 below, the manufactured welding rods for a hybrid welding machine were named Examples 1 to 3.

Chemical composition of welding rod (parts by weight) Example 1 Example 2 Example 3 Comparative example Fe (iron) 49.37 47.87 44.37 49.37 C (carbon) 0.70 0.70 0.70 0.70 Mn (manganese) 2.00 2.00 2.00 2.00 Cr (chrome) 25.50 25.50 25.50 25.50 Si (silicon) 0.03 0.03 0.03 0.03 Ni (nickel) 12.20 12.20 12.20 12.20 Mo (molybdenum) 3.45 3.45 3.45 3.45 Ag(silver) 4.25 4.25 4.25 4.25 Pt (Platinum) 2.50 2.50 2.50 2.50 lithium naphthalenide
(Lithium naphthalenide) - 1.50 1.50 - Tragacanthin - - 3.50 - Sum 100.00 100.00 100.00 100.00

[Comparative Example]

In the same manner as in Examples 1 to 3, a welding rod for a hybrid welding machine was manufactured using the components of Table 1, but without performing surface treatment on the formed metal wires. The manufactured welding rod was named as a comparative example.

[Experimental Example 1: Measurement of tensile strength]

For the welding rods for hybrid welding machines prepared in Examples 1 to 3 and Comparative Examples, the tensile strength was measured by measuring the distance between the gages (GL) as 250 mm and the tensile speed as 50 mm/min. It is shown in 2.

division Example 1 Example 2 Example 3 Comparative example Tensile strength (MPa) 510 620 680 440

As shown in Table 2, compared to the welding rod of the comparative example that does not include nanopores and mesopores on the surface, the welding rods of Examples 1 to 3 including a large number of nanopores and mesopores on the surface have higher tensile strength. It was confirmed that the intensity was shown. In addition, than the electrode of Example 1 that does not contain lithium naphthalenide and tragacanthine, and Example 2 that contains only one of lithium naphthalenide and tragacanthine, lithium naphthalenide and tragacanthine The tensile strength of Example 3 including all of them was improved. This proves that the mechanical properties of the welding rod were improved by including lithium naphthalenide and tragacanthine as constituents of the welding rod.

[Experimental Example 2: Evaluation of welding workability]

For the welding rods for hybrid welding machines prepared in Examples 1 to 3 and Comparative Examples, welding workability was evaluated through visual observation by a macro method, respectively, and are shown in Table 3 below.

Welding for welding workability evaluation was conducted by TIG welding with a plate material (for making cryogenic pipes) having an impact toughness of 25 J/mm or more at -196°C as the base material, and welding current of 220 A and welding of 25 cm/min It proceeded by supplying argon (Ar) gas as an inert gas at the rate. The evaluation results were expressed as excellent (high), moderate (medium), and poor (low), respectively.

division Example 1 Example 2 Example 3 Comparative example Welding workability evaluation result medium Prize Prize Ha

As a result of the evaluation of welding workability in Table 3, in the case of the welding rod of the comparative example that did not contain mesopores and nanopores on the surface, the criterion was not satisfied due to poor (lower), and the surface was carried out including a large number of mesopores and nanopores. It was confirmed that all of the welding rods of Examples 1 to 3 showed excellent welding workability. That is, it was proved that workability can be improved during welding when the surface of the welding rod includes mesopores and nanopores.

[Experimental Example 3: Measurement of impact toughness and yield strength]

After performing welding using the welding rods for hybrid welding machines prepared in Examples 1 to 3 and Comparative Examples, the Charpy impact toughness and the yield strength of the weld joint were measured, respectively, and are shown in Table 4 below.

division Example 1 Example 2 Example 3 Comparative example Impact toughness (J/mm) 39 52 68 Cracking Yield strength (MPa) 380 415 482 -

As shown in Table 4, when welding was performed using a welding rod of a comparative example that does not contain mesopores and nanopores on the surface, cracks occurred, and in Examples 1 to 3 prepared according to the composition of the present invention. When welding was performed using a welding rod, it could be confirmed that the impact toughness was 25 J/mm or more at -196°C, and high yield strength was shown.

In the present specification, only a few examples of various embodiments performed by the present inventors will be described, but the technical idea of the present invention is not limited or limited thereto, and may be modified and variously implemented by those skilled in the art.

Claims (3)

Iron 20 to 60 parts by weight, carbon 0.1 to 1 parts by weight, manganese 0.5 to 3 parts by weight, chromium 10 to 30 parts by weight, silicon 0.01 to 0.05 parts by weight, nickel 1 to 15 parts by weight, molybdenum 0.1 to 5 parts by weight, silver 3 to 5 parts by weight, and 0.5 to 5 parts by weight of platinum
As a welding rod for a hybrid welding machine comprising a,
The surface of the welding rod has a number of mesopores having a diameter of 3 nm to 50 nm and nanopores having a diameter of 0.1 nm to 2 nm,
Welding rod for hybrid welding machine. The method of claim 1, wherein the welding rod,
An alkali metal naphthalenide-based compound 0.01 to 3 parts by weight and 0.5 to 5 parts by weight of a water-soluble natural polymer additionally comprising, a welding rod for a hybrid welding machine. The method of claim 1,
The alkali metal naphthalenide-based compound may include sodium naphthalenide, lithium naphthalenide, or potassium naphthalenide,
The water-soluble natural polymer, chitosan, chitosan, chitosan derivatives; Dextran, dextran derivatives; Hyaluronic acid, hyaluronic acid salts, hyaluronic acid derivatives; Pectin, pectin salt, pectin derivative; Alginic acid, alginate, alginate derivatives; Agar, galactomannan, galactomannan salt, galactomannan derivatives; Xanthan, xanthan salt, xanthan derivative; Beta-cyclodextrin, beta-cyclodextrin salt, beta-cyclodextrin derivative; A welding rod for a hybrid welding machine comprising at least one selected from the group consisting of amylose, and combinations thereof.