CN108526752B - Self-protection flux-cored wire for welding in wading environment - Google Patents
Self-protection flux-cored wire for welding in wading environment Download PDFInfo
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- CN108526752B CN108526752B CN201810429582.3A CN201810429582A CN108526752B CN 108526752 B CN108526752 B CN 108526752B CN 201810429582 A CN201810429582 A CN 201810429582A CN 108526752 B CN108526752 B CN 108526752B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3608—Titania or titanates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a self-protection flux-cored wire for welding in a wading environment, which comprises a metal sheath and a flux core, wherein the flux core comprises the following components in percentage by mass: 35-55% of rutile, 10-20% of ferric oxide, 5-12% of aluminum oxide, 5-10% of calcium carbonate, 3-8% of fluoride, 2-5% of titanium powder, 4-8% of nickel powder, 1-2% of molybdenum powder and 15-25% of iron powder. The flux-cored wire disclosed by the invention can be used for welding in a wading environment, is easy to start arc during welding, is stable in arc combustion, has excellent welding process performance, and has attractive formed welding seams, the tensile strength of deposited metal after welding is more than 540MPa, no crack appears when the cold bending angle of 4 times of the plate thickness of a butt joint is 180 degrees, good impact toughness is realized, and the welding of medium-low carbon steel and low-alloy high-strength steel in the wading environment is met.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a self-protection flux-cored wire for welding in a wading environment.
Background
The automatic welding has the advantages of high production efficiency, good welding quality, low labor intensity and the like, and is widely applied to industries such as engineering machinery, petrochemical industry and the like. With the improvement of the automatic welding level in China, the automatic welding requirements under some special environments are more and more, such as the welding of a weldment with wet surface and water or under a rainy environment, which is collectively called as the welding under the wading environment. When welding is carried out in the environment, the workpiece is usually required to be dried, and welding is carried out under the condition that no moisture exists on the surface of the workpiece, but the complicated pre-welding treatment greatly reduces the welding efficiency in the wading environment. In addition, the workpiece can not be dried before welding in more special environments, such as emergency maintenance welding near a ship body and a ship lock draft line, steel structure welding near the horizontal plane of an offshore platform and the like. Under the conditions, the welding is difficult, the welding quality is difficult to ensure, and the potential safety hazard of service exists.
The welding materials used for automatic welding are welding wires, including solid welding wires and flux-cored welding wires, wherein the flux-cored welding wires have the advantages of high efficiency, automation, multiple varieties, wide application range, good welding process performance and the like of gas protection solid welding wires and submerged arc welding wires, and are widely applied. However, the existing commercial land welding flux-cored wire and the developed underwater wet welding flux-cored wire are not suitable for direct welding in wading environment. The main reasons are as follows: (1) when the onshore flux-cored wire is used for welding in a wading environment, water on the surface of a workpiece is heated and decomposed, so that the concentration of hydrogen dissolved in a weld pool is high, hydrogen holes and hydrogen refrigeration cracks are easily generated in a welding joint, and the performance of the joint is influenced; (2) in order to protect the electric arc in a welding area and ensure stable combustion of the electric arc under the action of water pressure during underwater automatic welding, more gas-making elements and arc-stabilizing elements are added into the flux-cored wire for underwater wet welding. When the flux-cored wire for underwater wet welding is used for welding in a wading environment, more smoke and gas are generated, and a large amount of air holes are easily generated in a welding line to influence the performance of a joint. Therefore, the development of the special self-protection flux-cored wire for welding in the wading environment can realize direct welding with water without drying and adding protective gas, and has important significance for reducing the welding construction difficulty in the wading environment and improving the welding efficiency and the welding quality in the wading environment.
Disclosure of Invention
In order to solve the technical problems, the invention provides the self-protection flux-cored wire for welding in the wading environment, so that the purposes of stable arcing, good welding manufacturability, high working efficiency and suitability for welding in the wading environment are achieved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a self-protection flux-cored wire for welding in a wading environment comprises a metal sheath and a flux core, wherein the metal sheath is formed by rolling a low-carbon steel strip, and the flux core comprises the following components in percentage by mass: 35-55% of rutile, 10-20% of ferric oxide, 5-12% of aluminum oxide, 5-10% of calcium carbonate, 3-8% of fluoride, 2-5% of titanium powder, 4-8% of nickel powder, 1-2% of molybdenum powder and 15-25% of iron powder.
In the scheme, the metal sheath is formed by rolling a low-carbon steel strip.
In the scheme, the fluoride is CaF2The combination of LiF and NaF, the mass percentage of which is CaF250-70％，LiF 15-30％，NaF 15-30％。
In the scheme, the filling rate of the medicine core is 22-32%.
According to the technical scheme, the self-protection flux-cored wire for welding in the wading environment provided by the invention considers the welding characteristics in the wading environment, and in order to ensure that a welding joint with excellent performance is obtained in the wading environment, the internal flux-cored formula is designed, and the arc is stably combusted during welding in the wading environment by adding the arc stabilizer into the flux core; by adding gas-making components, gas generated during welding plays a role in protecting electric arcs, molten drops and molten pool metal; by adding the hydrogen removing agent, the content of diffused hydrogen in the welding line is reduced, and hydrogen induced cracks are prevented from being generated; alloy elements are added to improve the weld joint structure and improve the mechanical property of weld joint metal.
In the chemical components of the medicinal powder, the action mechanism of each component is as follows:
rutile mainly plays a role in slagging, and also has a certain arc stabilizing function to ensure the welding process performance. When the rutile content is too low, the fluidity of the slag is poor, so that the slag is not well formed and is easy to stick to the slag. However, when the content is too high, the mechanical properties of the weld are deteriorated. Therefore, the rutile is added in the invention in 35-55% by mass.
The iron oxide mainly plays a role in slagging, reduces the viscosity and surface tension of molten slag, increases the energy of electric arc, and increases the fusion width and the fusion depth of a molten pool. In addition, it is also a surface active substance, improving the welding process performance. The iron oxide can be decomposed in the welding process to generate free oxygen, and the free oxygen reacts with hydrogen in a molten pool, so that the hydrogen content can be effectively reduced, the iron oxide can also react with harmful elements in weld metal, the content and the size of inclusions in deposited metal are reduced, the generation of acicular ferrite in the weld is promoted, and the impact toughness of the weld metal is improved. When the content of the ferric oxide is too low, the energy of the electric arc is insufficient, the molten pool is shallow and narrow, slag is easy to adhere, and the welding manufacturability is poor. However, when the iron oxide is added too much, the arc energy is too large, the splashing is increased, the forming is poor, and the slag is not easy to remove. Therefore, the weight percentage of the added ferric oxide is 10-20%.
Alumina can regulate the physical properties of the slag and improve the slag detachability of the slag. When the content of the aluminum oxide is more than 4, good welding wire welding process performance and deposited metal mechanical property can be obtained. However, the high content of alumina can cause the melting point of the slag to be obviously increased, the flux core is melted late and cannot play a role in protecting molten drops, and in addition, the defect of slag inclusion of weld metal is easily caused during solidification. Therefore, the mass percent of the added alumina is 5-12%.
Calcium carbonate, which mainly plays a role in gas generation and protects welding arcs and a molten pool. When the content of calcium carbonate is low, the slag forming and gas forming capabilities of the coating are insufficient, the protection effect on welding seams is insufficient, and the mechanical property is reduced; however, when the amount of calcium carbonate added is too large, gas generation is excessive, large spatters are likely to be generated during welding, and arc stability is deteriorated. Therefore, the calcium carbonate is added in the invention in a mass percentage of 5-10%.
Fluoride, with CaF2Mainly adding LiF and NaF, wherein the mass percent of the LiF and the NaF is CaF250-70%, LiF 15-30% and NaF 15-30%. The fluoride mainly plays a role in slagging and gas making. When welding is carried out in a wading environment, water on the surface of a workpiece is heated and decomposed, so that the concentration of hydrogen dissolved in a weld pool is very high, and hydrogen pores and hydrogen refrigeration cracks are easily generated in a weld. Fluoride is a dehydrogenation material excellent in dehydrogenation effect. CaF2Also has the functions of slag forming and slag thinning, and the viscosity of the slag is adjusted. Li and Na which are generated by the decomposition of LiF and NaF are alkali metals, so that the arc stabilizing effect is achieved, and the arc stability in a wading environment can be improved. When the addition amount of the fluoride is too low, gas making and slag making are insufficient, pores are easy to generate in a welding seam, the slag on the surface of the welding seam is not completely covered, and the like. When the addition amount of the fluoride is too much, the viscosity of the slag becomes low, and the slag flows seriously during welding, so that a good protection effect cannot be achieved. Therefore, the mass percent of the added fluoride is 3-8%.
The titanium powder mainly plays a role in reducing the content of diffusible hydrogen in the welding seam, improving the welding seam structure and improving the toughness of the joint. Titanium is a strong carbide forming element, and the formed titanium carbide has strong hydrogen capturing capacity. In addition, titanium is easy to react with nitrogen and oxygen in a molten pool to generate fine titanium oxide and titanium nitride particles, and the particles can be used as hydrogen traps to capture hydrogen and can also be used as heterogeneous nucleation particles to promote acicular ferrite nucleation, improve weld joint structures, refine grains and play a role in improving the toughness of joints. The mass percent of the added titanium is 2-5%.
The nickel powder and the molybdenum powder can promote the alloying of the welding seam metal and improve the structure and the performance of the welding seam. However, molybdenum element has a certain adverse effect on low-temperature toughness and crack resistance while improving strength. Therefore, the nickel powder and the molybdenum powder are added in the invention in the mass percentage of 4-8% and 1-2% respectively.
The iron powder mainly plays a role in adjusting components, ensuring the stability of electric arcs and improving the deposition efficiency. The weight percentage of the iron powder added in the invention is 15-25%.
The flux-cored wire is prepared by adopting a conventional flux-cored wire preparation technology.
The self-protection flux-cored wire for welding in the wading environment has the characteristics and advantages that: the arc striking is easy during welding in a wading environment, the arc combustion is stable, the arc extinguishing and breaking phenomena are avoided, the welding process performance is excellent, the formed welding seam is attractive, the tensile strength of the deposited metal after welding is more than 540MPa, no crack appears when the cold bending angle of 4 times the thickness of the butt joint is 180 degrees, the impact toughness is good, and the welding of medium-low carbon steel and low-alloy high-strength steel in the wading environment is met.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below.
The first embodiment is as follows: the medicinal powder comprises the following components in percentage by weight: 37% of rutile, 18% of ferric oxide, 6% of aluminum oxide, 8% of calcium carbonate, 4% of fluoride, 2% of titanium powder, 6% of nickel powder, 1% of molybdenum powder and 18% of iron powder.
Example two: the medicinal powder comprises the following components in percentage by weight: 44% of rutile, 12% of ferric oxide, 8% of aluminum oxide, 6% of calcium carbonate, 6% of fluoride, 3% of titanium powder, 4% of nickel powder, 1.5% of molybdenum powder and 15.5% of iron powder.
Example three: the medicinal powder comprises the following components in percentage by weight: 48% of rutile, 10% of ferric oxide, 5% of aluminum oxide, 7% of calcium carbonate, 5% of fluoride, 4% of titanium powder, 8% of nickel powder, 2% of molybdenum powder and 11% of iron powder.
The composition content of the medicine core powder is adjusted according to the proportion, the medicine core powder is prepared, 3 kinds of medicine core welding wires with different component contents are prepared, the granularity of the medicine core powder is 80 meshes, and the prepared medicine core powder is put into a powder mixer to be mixed for 5-6 hours and then taken out for standby.
The metal sheath of the flux-cored wire is made of a low-carbon steel strip with the specification of 0.3mm × 9mm, the flux-cored wire is produced according to the common flux-cored wire preparation process, the uniformly mixed flux-cored powder is added into the metal sheath to prepare the flux-cored wire with the O-shaped cross section, and the diameter of the flux-cored wire is equal to that of the flux-cored wire
The filling rate of the drug core is 22-32%.
The base material used in the examples was an E40 steel sheet having a thickness of 14mm, and the welding test was performed in a wading environment.
Effects of the embodiment: when the flux-cored wire is used for welding in a wading environment, the arc is easy to start, the arc combustion is stable, the arc extinction and breakage phenomena are avoided, the welding process performance is excellent, the formed welding seam is attractive, the tensile strength of the deposited metal after welding is more than 540MPa, no crack appears when the cold bending angle of 4 times of the plate thickness of the butt joint is 180 degrees, the impact toughness is good, and the welding requirement of low-carbon steel and low-alloy high-strength steel in the wading environment is met. The mechanical properties of the welded deposited metal of the embodiment of the invention are shown in table 1.
TABLE 1 mechanical Properties of post-weld deposited metals according to examples of the present invention
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The utility model provides a welding is with self-protecting flux cored wire under environment wades, includes metal sheath and flux core, its characterized in that: the medicine core comprises the following components in percentage by mass: 35-55% of rutile, 10-20% of ferric oxide, 5-12% of aluminum oxide, 5-10% of calcium carbonate, 3-8% of fluoride, 2-5% of titanium powder, 4-8% of nickel powder, 1-2% of molybdenum powder, 15-25% of iron powder and CaF (fluoride)2The combination of LiF and NaF, the mass percentage of which is CaF250-70％，LiF 15-30％，NaF 15-30％。
2. The self-shielded flux-cored wire for welding in the wading environment of claim 1, wherein: the metal sheath is formed by rolling a low-carbon steel strip.
3. The self-shielded flux-cored wire for welding in the wading environment of claim 1, wherein: the filling rate of the drug core is 22-32%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810429582.3A CN108526752B (en) | 2018-05-08 | 2018-05-08 | Self-protection flux-cored wire for welding in wading environment |
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| CN201810429582.3A CN108526752B (en) | 2018-05-08 | 2018-05-08 | Self-protection flux-cored wire for welding in wading environment |
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| CN108526752A CN108526752A (en) | 2018-09-14 |
| CN108526752B true CN108526752B (en) | 2020-06-30 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110293330B (en) * | 2019-07-03 | 2021-05-11 | 哈尔滨工业大学（威海） | Self-protection flux-cored wire for submerged-arc welding |
| CN110497114B (en) * | 2019-08-23 | 2021-05-25 | 哈尔滨工业大学（威海） | Hot agent assisted underwater wet welding self-protection flux-cored wire for low alloy steel |
| CN111571066B (en) * | 2020-04-17 | 2022-04-26 | 江苏大学 | Low-hydrogen stainless steel self-protection flux-cored wire suitable for underwater environment |
| CN111843293B (en) * | 2020-05-11 | 2022-04-26 | 江苏大学 | Oxidized self-protection flux-cored wire and application |
| CN112743191B (en) * | 2020-12-28 | 2022-10-28 | 哈尔滨工程大学烟台研究院 | Underwater arc additive repair method |
| CN115161085B (en) * | 2022-08-02 | 2023-06-16 | 中国石油大学(华东) | Hydrogen-resistant reconstruction method for hydrogen-oriented pipeline by using natural gas additive based on competitive adsorption |
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| US7829820B2 (en) * | 2005-04-05 | 2010-11-09 | Lincoln Global, Inc. | Flux cored electrode with fluorine |
| CN101804533A (en) * | 2010-04-27 | 2010-08-18 | 上海林肯电气有限公司 | Gas shielded flux-cored wire for welding with low temperature, high toughness and full positions |
| CN103084761B (en) * | 2013-02-27 | 2015-04-15 | 哈尔滨工业大学（威海） | Self-protection core welding stick used for underwater wet welding |
| CN107498209A (en) * | 2017-07-31 | 2017-12-22 | 西安理工大学 | 18Ni250 stainless steels Self-protecting flux-cored wire and preparation method thereof |
| CN107914099B (en) * | 2017-11-27 | 2020-06-19 | 四川大西洋焊接材料股份有限公司 | Rutile type flux-cored wire with tensile strength of 800MPa and preparation method thereof |
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