CN111571066B - Low-hydrogen stainless steel self-protection flux-cored wire suitable for underwater environment - Google Patents
Low-hydrogen stainless steel self-protection flux-cored wire suitable for underwater environment Download PDFInfo
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- CN111571066B CN111571066B CN202010307675.6A CN202010307675A CN111571066B CN 111571066 B CN111571066 B CN 111571066B CN 202010307675 A CN202010307675 A CN 202010307675A CN 111571066 B CN111571066 B CN 111571066B
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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
- B23K35/36—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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- 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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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Abstract
The invention belongs to the field of welding materials, and relates to a low-hydrogen stainless steel self-protection flux-cored wire suitable for an underwater environment. It includes outer metal skin and inside flux core, outer metal skin is 316L stainless steel band, its characterized in that: the inner flux core is composed of a gas-making slag-forming agent, an arc stabilizer and an alloying agent, and the mass percentages of the components are as follows: 40-60% of gas-making and slagging agent, 2-5% of arc stabilizer, 3-15% of deoxidizer and 30-50% of alloying agent. The self-protection flux-cored wire has the advantages that the gas-making slag-forming agent plays a role in protecting weld metal, the welding arc is easy to strike, the arc stability is good, the all-position underwater welding of metal structures such as low alloy steel, stainless steel and the like can be realized, the quality of the obtained welding joint is high, and the high-quality repair and welding can be carried out on the related metal structures in underwater environments such as nuclear power, ocean and the like.
Description
Technical Field
The invention belongs to the field of welding materials, and relates to a low-hydrogen stainless steel self-protection flux-cored wire suitable for an underwater environment.
Background
The steel structure in service in the underwater environment bears the additional load caused by storm, tide, wave and the like, and the effects of quicksand abrasion and seawater corrosion besides the working load. Offshore and offshore facilities have higher requirements on design planning, material selection for manufacturing and welding quality, and the emergency repair and daily maintenance work of the offshore facilities enable an underwater welding technology to become a key technology in ocean engineering construction. At present, welding materials of a stainless steel structure in an underwater environment mainly comprise welding rods, the welding efficiency is low, and efficient and high-quality underwater welding repair cannot be realized.
Patents CN102229029A, CN102451961A, CN103949796A and JP2017131912A all disclose a flux-cored wire for stainless steel, but the welding wires disclosed by these patents belong to gas protection, cannot realize self-protection function, can only be used in land environment, easily generate slag inclusion defect when welding underwater, cannot realize effective protection for weld metal, and have poor performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the low-hydrogen stainless steel self-protection flux-cored wire which is convenient to manufacture and suitable for the underwater environment, and can realize the welding of underwater carbon steel, low alloy steel and stainless steel.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a low-hydrogen type stainless steel self preservation protects flux cored wire suitable for underwater environment, includes outer metal skin and inside flux core, outer metal skin is 316L stainless steel band, its characterized in that: the inner flux core is composed of a gas-making slag-forming agent, an arc stabilizer and an alloying agent, and the mass percentages of the components are as follows: 40-60% of gas-making and slagging agent, 2-5% of arc stabilizer, 3-15% of deoxidizer and 30-50% of alloying agent.
Wherein the gas-making slag-forming agent consists of fluorite and BaF with different mass percentages2Carbonate and rutile, the fluorite accounts for 22-30 percent, and BaF28-14% of rutile, 1-3% of calcium carbonate.
30-50% of alloying agent is added into the flux core, and the alloying agent consists of chromium-nickel alloy powder, ferromolybdenum and ferromanganese with different mass percentages, the chromium-nickel alloy powder is prepared according to the proportion and is atomized into alloy powder by a vacuum melting furnace, wherein the mass ratio of nickel-chromium alloy (Ni/Cr,50/50, Ni/Cr is 50:50, the same below) accounts for 30-45%, the mass ratio of Mo-Fe (Mo/Fe,60/40) accounts for 0-2%, and the mass ratio of ferromanganese (Mn/Fe,45/55) accounts for 0-3%.
Wherein the arc stabilizer is composed of 1-3% LiF and 0-2% CeO by mass2To improve arc stability.
3-15% of deoxidizer is added into the drug core, and the deoxidizer consists of 3-10% of Al/Mg (50/50) alloy and 0-5% of ferrosilicon (silicon/iron, 45/55).
The action mechanism of each component in the chemical components of the medicinal powder is as follows:
according to the invention, rutile mainly plays roles in slagging and stabilizing the welding process, and carbonate and fluoride are added, so that on one hand, the slag after welding is alkaline neutral slag by optimizing the proportion of the slag, the transition coefficient of alloy elements is improved, on the other hand, the content of diffusible hydrogen of weld metal is reduced by virtue of the fluoride and calcium carbonate, the hydrogen induced cracking tendency of a welding joint is reduced, and slag-gas combined protection in the underwater welding process is realized, and the addition amount of the gas-making and slag-forming agent is 40-60%.
The added alloying agent aims at improving the comprehensive performance of the weld metal, on one hand, the nickel-chromium alloy powder is fully and uniformly mixed through vacuum melting, the metal after welding has a proper ferrite/austenite ratio and the hot cracking tendency is reduced, and in addition, the addition of the Mo element can ensure the pitting corrosion resistance of the weld metal, and the addition amount of the alloying agent is 30-50%.
The advantages and the characteristics of the invention are as follows: the low-hydrogen stainless steel self-protection flux-cored wire suitable for underwater environment is simple in manufacturing process, low in diffusible hydrogen content of a welding joint and excellent in comprehensive performance. Can realize underwater welding of underwater carbon steel, low alloy steel and stainless steel.
Detailed Description
The invention is further illustrated by the following examples of a low-hydrogen stainless steel self-shielded flux-cored wire suitable for underwater environment.
A low-hydrogen stainless steel self-protection flux-cored wire suitable for underwater environment. The gas-generating and arc-stabilizing flux-cored wire comprises an outer metal skin and an inner flux core, and is characterized in that the outer metal skin is a 316L strip, the inner flux core comprises the following specific components in percentage by mass: 40-60% of gas-making and slagging agent, 2-5% of arc stabilizer, 3-15% of deoxidizer and 30-50% of alloying agent.
The preparation method of the flux-cored wire comprises the following steps: accurately weighing the powder according to the proportion, mechanically and uniformly mixing by using a three-dimensional powder mixer, wherein the rotating speed of the powder mixer is 12-20r/min, and the powder mixing time is 4-8 hours according to different powder mixing amounts; the flux-cored wire sheath is a 316L stainless steel band, and the specification of the steel band is as follows: 0.5mm × 8 mm; the flux-cored wire with the O-shaped section is prepared on a flux-cored wire production line, the diameter of the flux-cored wire is 1.6mm, and the flux-cored filling rate is 18-25%.
Table 1 shows the welding process parameters used in the examples of the present invention.
TABLE 1 welding Process parameters used in the examples of the invention
| Welding voltage (V) | Welding current (A) | Welding speed (m/min) | Wire feed speed (mmin) |
| 28-32 | 200-240 | 90-120 | 4-6 |
Table 2 shows the chemical compositions of the flux-cored wire for underwater wet welding according to the present invention.
TABLE 2 chemical composition of exemplary embodiments of self-shielded flux cored wires for underwater wet welding
| Examples | CaF2 | BaF2 | TiO2 | Al/Mg | CaCO3 | Chromium nickel | Ferromolybdenum | Ferromanganese | Silicon iron | LiF | CeO2 |
| 1 | 22 | 8 | 9 | 8 | 3 | 43 | 1 | 1 | 3 | 1 | 1 |
| 2 | 26 | 11 | 11 | 6 | 1 | 38 | 2 | 2 | 0 | 1 | 2 |
| 3 | 30 | 14 | 14 | 3 | 2 | 33 | 0 | 0 | 2 | 2 | 0 |
Table 3 shows the mechanical properties and diffusible hydrogen content of the weld metals obtained in the examples of the present invention.
TABLE 3 mechanical Properties and diffusible Hydrogen content of weld metals obtained in accordance with examples of the invention
The stainless steel self-shielded flux-cored wires prepared using the flux-cored components of examples 1-3 were subjected to an underwater welding test without any added protection. The result shows that the stainless steel underwater welding joint with high quality can be obtained by adopting the stainless steel self-protection flux-cored wire; the base material has excellent performance, no crack and low porosity. Particularly, the stainless steel self-shielded flux-cored wire prepared by using the flux-cored components in the embodiment 3 shows good welding process performance, compared with the common underwater self-shielded flux-cored wire, the arc stability of the wire is improved by 15% under the same conditions, the content of diffusible hydrogen almost reaches the standard in the air environment, the mechanical property of the joint is excellent, and the actual welding requirement of an underwater steel structure can be met.
Claims (2)
1. The utility model provides a low-hydrogen type stainless steel self preservation protects flux cored wire suitable for underwater environment, includes outer metal skin and inside flux core, outer metal skin is 316L stainless steel band, its characterized in that: the inner flux core is composed of a gas-making slag-forming agent, an arc stabilizer, a deoxidizer and an alloying agent, and the mass percentages of the components are as follows: 40-60% of gas-making and slag-forming agent, 2-5% of arc stabilizer, 3-15% of deoxidizer and 30-50% of alloying agent; the above-mentionedThe arc stabilizer is composed of 1-3% LiF and 0-2% CeO by mass2The deoxidizer consists of 3-10% of Al/Mg alloy and 0-5% of ferrosilicon, wherein in the Al/Mg alloy, the mass ratio of Al to Mg is 50: 50; in the ferrosilicon, the mass ratio of Si to Fe is 45: 55; the gas-making slag-forming agent is made of fluorite and BaF with different mass percentages2Carbonate and rutile, the fluorite accounts for 22-30 percent, and BaF28-14% of rutile, 1-3% of calcium carbonate and 9-13% of rutile; the alloy agent consists of chromium-nickel alloy powder, ferromolybdenum and ferromanganese with different mass percentages, wherein the chromium-nickel alloy powder is prepared according to a proportion and is atomized into alloy powder after being smelted in a vacuum smelting furnace, wherein the mass ratio of nickel-chromium alloy is 30-45%, the mass ratio of ferromolybdenum is 0-2%, the mass ratio of ferromanganese is 0-3%, and the mass ratio of Ni to Cr in the nickel-chromium alloy is 50: 50; in the ferromolybdenum, the mass ratio of Mo to Fe is 60: 40; in ferromanganese, the mass ratio of Mn to Fe is 45: 55.
2. the method for preparing the low-hydrogen stainless steel self-shielded flux-cored wire suitable for underwater environment of claim 1, wherein the method comprises the following steps: accurately weighing the powder according to the proportion, mechanically and uniformly mixing by using a three-dimensional powder mixer, wherein the rotating speed of the powder mixer is 12-20r/min, and the powder mixing time is 4-8 hours according to different powder mixing amounts; the flux-cored wire sheath is a 316L stainless steel band, and the specification of the steel band is as follows: 0.5mm × 8 mm; the flux-cored wire with the O-shaped section is prepared on a flux-cored wire production line, the diameter of the flux-cored wire is 1.6mm, and the flux-cored filling rate is 18-25%.
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| CN202010307675.6A CN111571066B (en) | 2020-04-17 | 2020-04-17 | Low-hydrogen stainless steel self-protection flux-cored wire suitable for underwater environment |
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| CN111571066B true CN111571066B (en) | 2022-04-26 |
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| 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 |
| CN112719687B (en) * | 2020-12-17 | 2022-06-14 | 中国人民解放军陆军装甲兵学院 | Flux-cored wire for underwater welding |
| CN114505615B (en) * | 2022-02-28 | 2023-01-17 | 山东大学 | Flux-cored wire special for deep sea wet FCAW and preparation method |
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| UA89262C2 (en) * | 2008-03-31 | 2010-01-11 | Институт Электросварки Им. Е.О.Патона Нан Украины | Flux cored wire for wet underwater welding high-alloy nickel-chromium-molybdenum steel of 17-13-3 type |
| UA89266C2 (en) * | 2008-03-31 | 2010-01-11 | Институт Электросварки Им. Е.О.Патона Нан Украины | Flux cored wire for wet underwater welding high-alloy nickel-chromium steel of 18-10 type |
| CN106078006A (en) * | 2016-07-07 | 2016-11-09 | 中国船舶重工集团公司第七二五研究所 | A kind of 550MPa high-strength steel ultralow-hydrogen low high tenacity seamless flux-cored wire |
| CN107695560A (en) * | 2017-10-20 | 2018-02-16 | 西安理工大学 | 25Cr2Ni4MoV gas-shielded flux-cored wires and preparation method thereof |
| CN108526752A (en) * | 2018-05-08 | 2018-09-14 | 山东省科学院海洋仪器仪表研究所 | One kind is paddled welding self-protection flux-cored wire under environment |
| CN108544141A (en) * | 2018-03-15 | 2018-09-18 | 西安理工大学 | WH80 and 20Mn23Al self-protection flux-cored wires and preparation method thereof |
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2020
- 2020-04-17 CN CN202010307675.6A patent/CN111571066B/en active Active
Patent Citations (6)
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| UA89262C2 (en) * | 2008-03-31 | 2010-01-11 | Институт Электросварки Им. Е.О.Патона Нан Украины | Flux cored wire for wet underwater welding high-alloy nickel-chromium-molybdenum steel of 17-13-3 type |
| UA89266C2 (en) * | 2008-03-31 | 2010-01-11 | Институт Электросварки Им. Е.О.Патона Нан Украины | Flux cored wire for wet underwater welding high-alloy nickel-chromium steel of 18-10 type |
| CN106078006A (en) * | 2016-07-07 | 2016-11-09 | 中国船舶重工集团公司第七二五研究所 | A kind of 550MPa high-strength steel ultralow-hydrogen low high tenacity seamless flux-cored wire |
| CN107695560A (en) * | 2017-10-20 | 2018-02-16 | 西安理工大学 | 25Cr2Ni4MoV gas-shielded flux-cored wires and preparation method thereof |
| CN108544141A (en) * | 2018-03-15 | 2018-09-18 | 西安理工大学 | WH80 and 20Mn23Al self-protection flux-cored wires and preparation method thereof |
| CN108526752A (en) * | 2018-05-08 | 2018-09-14 | 山东省科学院海洋仪器仪表研究所 | One kind is paddled welding self-protection flux-cored wire under environment |
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