High-manganese steel flux-cored wire for surfacing and preparation method of high-manganese steel flux-cored wire

Abstract

The invention discloses a high-manganese steel flux-cored wire for surfacing and a preparation method of the high-manganese steel flux-cored wire, and relates to the technical field of welding materials, the high-manganese steel flux-cored wire is composed of a steel outer skin and a flux core, the flux core is wrapped in the steel outer skin, and the flux core comprises, by weight, 0.1-0.6 part of natural rutile, 0.2-0.8 part of ferrosilicon powder and 0.1-0.3 part of potassium titanate. The material comprises, by weight, 20-30 parts of magnesium powder, 0.1-0.4 part of magnesium powder, 0.1-0.3 part of fluoride, 8-11 parts of electrolytic manganese powder and 0.1-0.5 part of quartz sand. Through organic combination of the components, the Brinell hardness HB of deposited metal after welding of the welding wire is larger than or equal to 170. And the wear resistance of the whole welding seam is effectively improved. The welding process performance is good, electric arcs are stable, splashing is small, and formed weld joints are attractive.

Description

Technical Field

[0001] This invention relates to the field of welding materials technology, specifically to a high-manganese steel flux-cored welding wire for surfacing welding and its preparation method. Background Technology

[0002] Welding wire, as a key filler material in the welding process, is widely used in many industries such as machinery manufacturing, aerospace, shipbuilding, automobiles, and construction. After the welding wire is melted by electric arc or flame, it combines with the base material to achieve metal connection or surface repair.

[0003] High-manganese steel refers to alloy steel with a manganese content of more than 10%. The as-cast microstructure of high-manganese steel typically consists of austenite, carbides, and pearlite, sometimes containing a small amount of phosphorus eutectic. When the amount of carbides is high, they often appear in a network pattern at the grain boundaries. Therefore, as-cast high-manganese steel is very brittle and unusable, requiring heat treatment. The commonly used heat treatment method is solution treatment, which involves heating the steel to 1050℃~1100℃, holding it at this temperature to eliminate the as-cast microstructure, obtaining a single-phase austenite microstructure, and then water quenching to maintain this microstructure at room temperature.

[0004] High manganese steel is extremely prone to work hardening. Currently, flux-cored welding wires used for welding high manganese steel have problems such as low Brinell hardness of the weld metal and low overall mechanical properties and wear resistance of the weld. Summary of the Invention

[0005] Based on the current problems of low Brinell hardness of the weld metal and low overall mechanical properties and wear resistance of the weld, which are problems with flux-cored welding wires used for welding high-manganese steel, the purpose of this invention is to provide a flux-cored welding wire for high-manganese steel surfacing and its preparation method. After welding, the flux-cored welding wire produces a weld metal with a Brinell hardness HB≥170, which effectively improves the overall mechanical properties and wear resistance of the weld. In addition, it provides a stable arc, less spatter, and a beautiful weld formation.

[0006] This invention is achieved through the following technical solution:

[0007] In a first aspect, this application provides a high-manganese steel flux-cored welding wire for surfacing, comprising a steel outer sheath and a flux core, wherein the flux core is encased within the steel outer sheath, and by weight, the flux core comprises the following components:

[0008] 0.1-0.6 parts of natural rutile, 0.2-0.8 parts of ferrosilicon powder, 0.1-0.3 parts of potassium titanate, 0.1-0.4 parts of magnesium powder, 0.1-0.3 parts of fluoride, 8-11 parts of electrolytic manganese powder, and 0.1-0.5 parts of quartz sand.

[0009] The electrolytic manganese powder added in this invention acts as a deoxidizer, combining with sulfur during welding to form manganese sulfide (MnS), thereby reducing the tendency for hot cracking. Simultaneously, the limited content of electrolytic manganese powder in this invention effectively removes oxygen and reduces weld defects. Furthermore, in steel welding, the electrolytic manganese added in this invention, through combined deoxidation with silicon in ferrosilicon powder, generates low-melting-point silicate slag, forming a Mn-Si composite deoxidation system. This reduces oxide inclusions, minimizes slag density differences, optimizes weld microstructure, and improves weld strength and toughness. Additionally, the electrolytic manganese powder can dissolve into the ferrite matrix, enhancing its strength and hardness.

[0010] The potassium titanate added in this invention mainly functions to stabilize the arc, reduce spatter, and refine the weld seam. As a welding flux additive, potassium titanate can reduce arc voltage, stabilize the arc, reduce voltage fluctuations during welding, and improve arc stability. After using potassium titanate, weld spatter is significantly reduced, the welding quality is higher, and potassium titanate can improve the weld seam microstructure, making the weld seam denser and enhancing the mechanical properties of the welded joint.

[0011] The main component of the natural rutile added in this invention is titanium dioxide, which can ensure a stable arc and fine forming of the weld.

[0012] In this invention, magnesium powder and fluoride react during welding to generate low-melting-point magnesium fluoride slag (MgF2), which can efficiently desulfurize and deoxidize, purifying the molten pool. In addition, fluoride can reduce the viscosity of the molten slag, promote the floating of impurities, and reduce slag inclusion defects. Magnesium vapor agitates the molten pool, which can accelerate gas escape and improve the density of the weld.

[0013] In this invention, the quartz sand combines with the magnesium oxide formed during the welding process to form a neutral slag, which balances the fluidity. At the same time, it is embedded in the weld as a hard phase, which together with carbides improves the surface wear resistance. It also works synergistically with rutile to supplement the silicon source and stabilize the silicon-titanium slag system.

[0014] In one specific embodiment, the powder core comprises the following components:

[0015] 0.4 parts natural rutile, 0.5 parts ferrosilicon powder, 0.2 parts potassium titanate, 0.2 parts magnesium powder, 0.2 parts fluoride, 9 parts electrolytic manganese powder, and 0.3 parts quartz sand. The amounts of these components are the preferred amounts for the powder core.

[0016] In one specific embodiment, the steel outer skin, by mass percentage, comprises: 0.02wt%≤C≤0.04wt%, 0.10wt%≤Mn≤0.40wt%, 0<Si≤0.04wt%, 0<S≤0.030wt%, 0<P≤0.030wt%, with the balance being iron powder and unavoidable impurities.

[0017] In one specific embodiment, the steel outer skin, by mass percentage, comprises: 0.03 wt% C, 0.24 wt% Mn, 0.02 wt% Si, 0.006 wt% S, 0.007 wt% P, with the balance being iron and unavoidable impurities. This composition is the preferred amount for the steel outer skin.

[0018] In one specific embodiment, the fluoride includes any one or more combinations of calcium fluoride, potassium fluorotitanate, and potassium fluoroaluminate.

[0019] In one specific embodiment, the flux core is 8.7% to 13.9% of the weight of the flux-cored welding wire.

[0020] In one specific embodiment, the flux core comprises 10.8% of the weight of the flux-cored wire. This weight is a preferred value for the flux core in the flux-cored wire.

[0021] In one specific embodiment, the diameter of the high-manganese steel flux-cored welding wire is 1.0mm to 1.6mm.

[0022] In one specific embodiment, the diameter of the high-manganese steel flux-cored welding wire is 1.3 mm. This diameter value is a preferred diameter value for high-manganese steel flux-cored welding wire.

[0023] Secondly, this application provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. After the components of the flux core are mixed evenly according to the ratio, the steel outer sheath is placed in a welding wire forming machine. The evenly mixed flux core mixture is injected into a steel strip groove that is laterally bent into a "U" shape, and then rolled into a wire, and then drawn into a welding wire with a diameter of 1.0mm to 1.6mm.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] (1) Through the organic combination of the above components, the Brinell hardness HB of the weld metal after welding is ≥170. This effectively improves the overall wear resistance of the weld. The welding process has good performance, with stable arc, little spatter, and beautiful weld formation.

[0026] (2) The electrolytic manganese powder added in this invention acts as a deoxidizer, combining with sulfur during the welding process to generate manganese sulfide (MnS), thereby reducing the tendency for hot cracking. At the same time, the content of electrolytic manganese powder specified in this invention can effectively remove oxygen and reduce weld defects. In addition, in steel welding, the electrolytic manganese added in this invention can combine with silicon in ferrosilicon powder to generate low-melting-point silicate slag, forming a Mn-Si composite deoxidation system, reducing oxide inclusions, reducing slag density differences, optimizing weld microstructure, and improving weld strength and toughness. Furthermore, electrolytic manganese powder can dissolve into the ferrite matrix, improving its strength and hardness.

[0027] (3) The potassium titanate added in this invention mainly plays the role of stabilizing the arc, reducing spatter, and refining the weld in the weld. As a welding flux additive, potassium titanate can reduce the arc voltage, stabilize the arc, reduce voltage fluctuations during the welding process, and improve arc stability. After using potassium titanate, weld spatter is significantly reduced, the welding quality is higher, and potassium titanate can improve the weld microstructure, making the weld denser and enhancing the mechanical properties of the welded joint.

[0028] (4) The main component of the natural rutile added in this invention is titanium dioxide, which can ensure a stable arc and fine forming of the weld.

[0029] (5) In this invention, magnesium powder and fluoride react during welding to generate low-melting-point magnesium fluoride slag (MgF2), which can efficiently desulfurize and deoxidize, and purify the molten pool. In addition, fluoride can reduce the viscosity of molten slag, promote the floating of impurities, and reduce slag inclusion defects. Magnesium vapor agitates the molten pool, which can accelerate the gas escape and improve the weld density.

[0030] (6) In this invention, the quartz sand combines with the magnesium oxide formed during the welding process to form a neutral slag, which balances the fluidity. At the same time, it is embedded in the weld as a hard phase, which together with the carbides improves the surface wear resistance. It also works with rutile to supplement the silicon source and stabilize the silicon-titanium slag system. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments. The illustrative embodiments and descriptions of this invention are only used to explain this invention and are not intended to limit this invention.

[0032] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known materials or methods have not been specifically described in order to avoid obscuring the invention.

[0033] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those different embodiments or examples.

[0034] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60–120 and 80–110 are listed for a specific parameter, it is understood that ranges of 60–110 and 80–120 are also expected. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0035] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), indicating that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0036] Example 1

[0037] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. The specific preparation method is as follows:

[0038] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100 kg welding wire as an example, the flux core accounts for 8.7 wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1 kg of natural rutile, 0.2 kg of 75% ferrosilicon powder, 0.1 kg of potassium titanate, 0.1 kg of magnesium powder, 0.1 kg of calcium fluoride, 8 kg of electrolytic manganese powder, and 0.1 kg of quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0039] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0040] Example 2

[0041] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Embodiment 1, the amount of each component in the flux core in this embodiment is different from that in Embodiment 1. Specifically, it consists of: 0.4 kg of natural rutile, 0.5 kg of 75% ferrosilicon powder, 0.2 kg of potassium titanate, 0.2 kg of magnesium powder, 0.2 kg of calcium fluoride, 9 kg of electrolytic manganese powder, and 0.3 kg of quartz sand.

[0042] The specific preparation method is as follows:

[0043] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100Kg welding wire as an example, in this embodiment, the flux core accounts for 10.8wt% of the total weight of the welding wire. The components in the flux core are: 0.4kg natural rutile, 0.5kg 75% ferrosilicon powder, 0.2kg potassium titanate, 0.2kg magnesium powder, 0.2kg fluoride, 9kg electrolytic manganese powder, and 0.3kg quartz sand. Then, the components in the flux core are mixed evenly and set aside for use.

[0044] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0045] Example 3

[0046] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Embodiment 1, the amount of each component in the flux core in this embodiment is different from that in Embodiment 1. Specifically, it consists of: 0.6 kg of natural rutile, 0.8 kg of 75% ferrosilicon powder, 0.3 kg of potassium titanate, 0.4 kg of magnesium powder, 0.3 kg of calcium fluoride, 11 kg of electrolytic manganese powder, and 0.5 kg of quartz sand.

[0047] The specific preparation method is as follows:

[0048] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100 kg welding wire as an example, in this embodiment, the flux core accounts for 13.9wt% of the total weight of the welding wire. The components of the flux core are: 0.6 kg of natural rutile, 0.8 kg of 75% ferrosilicon powder, 0.3 kg of potassium titanate, 0.4 kg of magnesium powder, 0.3 kg of calcium fluoride, 11 kg of electrolytic manganese powder, and 0.5 kg of quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0049] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0050] Example 4

[0051] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Embodiment 1, the chemical composition of the outer sheath of the welding wire in this embodiment is: C 0.02wt%, Mn 0.1wt%, Si 0.01wt%, S 0.001wt%, P 0.010wt%.

[0052] The specific preparation method is as follows:

[0053] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.02wt%, Mn 0.1wt%, Si 0.01wt%, S 0.001wt%, P 0.010wt%. Taking the preparation of 100 kg welding wire as an example, in this embodiment, the flux core accounts for 8.7wt% of the total weight of the welding wire. The components in the flux core are: 0.1 kg of natural rutile, 0.2 kg of 75% ferrosilicon powder, 0.1 kg of potassium titanate, 0.1 kg of magnesium powder, 0.1 kg of calcium fluoride, 8 kg of electrolytic manganese powder, and 0.1 kg of quartz sand. Then, the components in the flux core are mixed evenly and set aside for use.

[0054] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0055] Example 5

[0056] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Embodiment 1, the chemical composition of the outer sheath of the welding wire in this embodiment is: C 0.04wt%, Mn 0.4wt%, Si 0.04wt%, S 0.03wt%, P 0.03wt%.

[0057] The specific preparation method is as follows:

[0058] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.04wt%, Mn 0.4wt%, Si 0.04wt%, S 0.03wt%, P 0.03wt%. Taking the preparation of 100 kg welding wire as an example, the flux core accounts for 8.7 wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1 kg of natural rutile, 0.2 kg of 75% ferrosilicon powder, 0.1 kg of potassium titanate, 0.1 kg of magnesium powder, 0.1 kg of calcium fluoride, 8 kg of electrolytic manganese powder, and 0.1 kg of quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0059] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0060] Example 6

[0061] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Embodiment 1, the high-manganese steel flux-cored welding wire prepared in this embodiment has a diameter of 1.0 mm.

[0062] The specific preparation method is as follows:

[0063] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100 kg welding wire as an example, the flux core accounts for 8.7 wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1 kg of natural rutile, 0.2 kg of 75% ferrosilicon powder, 0.1 kg of potassium titanate, 0.1 kg of magnesium powder, 0.1 kg of calcium fluoride, 8 kg of electrolytic manganese powder, and 0.1 kg of quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0064] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.0mm.

[0065] Example 7

[0066] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Embodiment 1, the high-manganese steel flux-cored welding wire prepared in this embodiment has a diameter of 1.6 mm.

[0067] The specific preparation method is as follows:

[0068] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100 kg welding wire as an example, the flux core accounts for 8.7 wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1 kg of natural rutile, 0.2 kg of 75% ferrosilicon powder, 0.1 kg of potassium titanate, 0.1 kg of magnesium powder, 0.1 kg of calcium fluoride, 8 kg of electrolytic manganese powder, and 0.1 kg of quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0069] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.6mm.

[0070] Example 8

[0071] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. The difference from Embodiment 1 is that the fluoride in this embodiment is potassium fluorotitanate.

[0072] The specific preparation method is as follows:

[0073] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100Kg welding wire as an example, the flux core accounts for 8.7wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1kg natural rutile, 0.2kg 75% ferrosilicon powder, 0.1kg potassium titanate, 0.1kg magnesium powder, 0.1kg potassium fluorotitanate, 8kg electrolytic manganese powder, and 0.1kg quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0074] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0075] Example 9

[0076] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. The difference from Embodiment 1 is that the fluoride in this embodiment is potassium fluoroaluminate.

[0077] The specific preparation method is as follows:

[0078] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100Kg welding wire as an example, the flux core accounts for 8.7wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1kg natural rutile, 0.2kg 75% ferrosilicon powder, 0.1kg potassium titanate, 0.1kg magnesium powder, 0.1kg potassium fluoroaluminate, 8kg electrolytic manganese powder, and 0.1kg quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0079] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0080] Comparative Example 1

[0081] This comparative example provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Example 1, the flux core of this comparative example does not contain 75% ferrosilicon powder, and the amount of natural rutile is 0.3 kg.

[0082] The specific preparation method is as follows:

[0083] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100 kg welding wire as an example, the flux core accounts for 8.7 wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.3 kg of natural rutile, 0.1 kg of potassium titanate, 0.1 kg of magnesium powder, 0.1 kg of calcium fluoride, 8 kg of electrolytic manganese powder, and 0.1 kg of quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0084] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0085] Comparative Example 2

[0086] This comparative example provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Example 1, this comparative example does not contain potassium titanate, and the amount of 75 ferrosilicon powder is 0.3 kg.

[0087] The specific preparation method is as follows:

[0088] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100Kg welding wire as an example, the flux core accounts for 8.7wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1kg natural rutile, 0.3kg 75% ferrosilicon powder, 0.1kg magnesium powder, 0.1kg calcium fluoride, 8kg electrolytic manganese powder, and 0.1kg quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0089] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0090] Comparative Example 3

[0091] This comparative example provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Example 1, this comparative example does not contain magnesium powder and contains 0.2 kg of potassium titanate.

[0092] The specific preparation method is as follows:

[0093] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100Kg welding wire as an example, the flux core accounts for 8.7wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1kg natural rutile, 0.2kg 75% ferrosilicon powder, 0.2kg potassium titanate, 0.1kg calcium fluoride, 8kg electrolytic manganese powder, and 0.1kg quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0094] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0095] Comparative Example 4

[0096] This embodiment provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Embodiment 1, this comparative example does not contain calcium fluoride and contains 0.2 kg of magnesium powder.

[0097] The specific preparation method is as follows:

[0098] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100 kg welding wire as an example, the flux core accounts for 8.7 wt% of the total weight of the welding wire in this embodiment. The components of the flux core are: 0.1 kg of natural rutile, 0.2 kg of 75% ferrosilicon powder, 0.1 kg of potassium titanate, 0.2 kg of magnesium powder, 8 kg of electrolytic manganese powder, and 0.1 kg of quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0099] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0100] Comparative Example 5

[0101] This comparative example provides a method for preparing a high-manganese steel flux-cored welding wire for surfacing welding. Unlike Example 1, this comparative example does not contain electrolytic manganese powder, and the amount of quartz sand is 8.1 kg.

[0102] The specific preparation method is as follows:

[0103] S1. A steel strip (width × thickness) of 14 × 0.6 mm is used as the outer sheath of the welding wire. Its chemical composition is C 0.025wt%, Mn 0.25wt%, Si 0.03wt%, S 0.005wt%, P 0.010wt%. Taking the preparation of 100 kg welding wire as an example, in this embodiment, the flux core accounts for 8.7wt% of the total weight of the welding wire. The components of the flux core are: 0.1 kg of natural rutile, 0.2 kg of 75% ferrosilicon powder, 0.1 kg of potassium titanate, 0.1 kg of magnesium powder, 0.1 kg of calcium fluoride, and 8.1 kg of quartz sand. Then, the components of the flux core are mixed evenly and set aside for use.

[0104] S2. Place the steel outer sheath in the welding wire forming machine, and successively inject the prepared flux core mixture into the groove of the steel strip that is laterally bent into a "U" shape, and then roll it into wire, and then draw it to ￠1.3mm.

[0105] After testing the hardness, tensile strength, yield strength, elongation, impact toughness, and diffusible hydrogen content of the welding wires prepared using the methods of Examples 1-9 and Comparative Examples 1-5, it was found that the welding wires prepared using the methods of Examples 1-9 exhibited better hardness, tensile strength, yield strength, elongation, impact toughness, and diffusible hydrogen content than those of Comparative Examples 1-5. Furthermore, the weld metal welded using the welding wire of the present invention has a Brinell hardness HB ≥ 170, effectively improving the overall wear resistance of the weld.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A high-manganese steel flux-cored welding wire for overlay welding, characterized in that, It consists of a steel outer casing and a powder core, wherein the powder core is enclosed within the steel outer casing, and by weight, the powder core comprises the following components: 0.1-0.6 parts of natural rutile, 0.2-0.8 parts of ferrosilicon powder, 0.1-0.3 parts of potassium titanate, 0.1-0.4 parts of magnesium powder, 0.1-0.3 parts of fluoride, 8-11 parts of electrolytic manganese powder, and 0.1-0.5 parts of quartz sand.

2. The high-manganese steel flux-cored welding wire for surfacing welding according to claim 1, characterized in that, The powder core comprises the following components: 0.4 parts natural rutile, 0.5 parts ferrosilicon powder, 0.2 parts potassium titanate, 0.2 parts magnesium powder, 0.2 parts fluoride, 9 parts electrolytic manganese powder, and 0.3 parts quartz sand.

3. The high-manganese steel flux-cored welding wire for surfacing welding according to claim 1, characterized in that, The steel outer skin, by weight percentage, comprises: 0.02wt%≤C≤0.04wt%, 0.10wt%≤Mn≤0.40wt%, 0<Si≤0.04wt%, 0<S≤0.030wt%, 0<P≤0.030wt%, with the balance being iron powder and unavoidable impurities.

4. The high-manganese steel flux-cored welding wire for overlay welding according to claim 3, characterized in that, The composition of the steel outer skin, by weight percentage, is as follows: 0.03 wt% C, 0.24 wt% Mn, 0.02 wt% Si, 0.006 wt% S, 0.007 wt% P, balance iron and unavoidable impurities.

5. The high-manganese steel flux-cored welding wire for surfacing welding according to claim 1, characterized in that, The fluoride includes any one or more combinations of calcium fluoride, potassium fluorotitanate, and potassium fluoroaluminate.

6. The high-manganese steel flux-cored welding wire for surfacing welding according to claim 1, characterized in that, The flux core comprises 8.7% to 13.9% of the weight of the flux-cored welding wire.

7. The high-manganese steel flux-cored welding wire for surfacing welding according to claim 1, characterized in that, The flux core is 10.8% of the weight of the flux-cored welding wire.

8. The high-manganese steel flux-cored welding wire for surfacing welding according to claim 1, characterized in that, The diameter of the high-manganese steel flux-cored welding wire is 1.0mm~1.6mm.

9. A high-manganese steel flux-cored welding wire for surfacing welding according to claim 8, characterized in that, The diameter of the high-manganese steel flux-cored welding wire is 1.3 mm.

10. A method for preparing a high-manganese steel flux-cored welding wire for surfacing as described in any one of claims 1 to 9, characterized in that, After the components of the powder core are mixed evenly according to the formula, the steel outer sheath is placed in the welding wire forming machine. The evenly mixed powder core mixture is injected into the groove of the steel strip that is bent into a "U" shape. Then it is rolled into wire and then drawn into a welding wire with a diameter of 1.0mm to 1.6mm.