CN105345315A - High-Ni-content self-protection flux-cored wire for welding high-steel-grade pipeline - Google Patents
High-Ni-content self-protection flux-cored wire for welding high-steel-grade pipeline Download PDFInfo
- Publication number
- CN105345315A CN105345315A CN201510921250.3A CN201510921250A CN105345315A CN 105345315 A CN105345315 A CN 105345315A CN 201510921250 A CN201510921250 A CN 201510921250A CN 105345315 A CN105345315 A CN 105345315A
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- Prior art keywords
- welding
- cored wire
- flux
- self
- powder
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Classifications
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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
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Abstract
The invention discloses a high-Ni-content self-protection flux-cored wire for welding a high-steel-grade pipeline and belongs to the field of welding materials. The high-Ni-content self-protection flux-cored wire comprises wire skin and a flux core. According to the formula of flux powder of the flux core, the flux powder of the flux core comprise, by mass, 40%-60% of fluoride, 10%-22% of oxides, 1%-8% of carbonate, 0.5%-2% of aluminum powder, 12%-18% of Al-Mg alloy powder, 3%-10% of electrolytic manganese metal, 12%-25% of nickel powder and 0.1%-0.6% of metallic zirconium. The high-Ni-content self-protection flux-cored wire for welding the high-steel-grade pipeline has the advantages that the situation that a large amount of smoke and harmful gas is generated in the welding process can be avoided, the nitrogen content and the oxygen content in a molten bath are reduced, the content of freedom nitrogen in weld metal is reduced, MA components are refined, a weld joint is effectively improved, and the impact toughness is high. The high-Ni-content self-protection flux-cored wire can particularly meet the requirement for field working of outdoor large-diameter pipeline steel.
Description
Technical field
The invention belongs to field of welding material, be specifically related to a kind of high Ni self-protection flux-cored wire being applicable to high-grade pipe welding, be particularly useful for all positon self-shield flux-cored wire used for welding of high-grade pipe (X80, X90, X100).
Background technology
Self-protection flux-cored wire is a kind of cross-centennial Novel welding material, has obtained in countries in the world applying more and more widely, has had vast potential for future development.Self-protection flux-cored wire, except the feature with flux-cored wire, also has the following advantages: 1. do not need additional protection source of the gas, can use existing gas shielded welding equipment modification, reduces renewal of the equipment cost and operation of being more convenient for; 2. there is excellent wind loading rating, usually can smooth welding under fresh breeze; 3. excellent rust-proofing ability.Self-protection flux-cored wire is as a kind of welding material of efficient and applicable outdoor work; enjoy favor at welding fields such as petroleum pipeline, boats and ships, drilling platforms, especially in China's Pipeline, some employing self-protection flux-cored wire semiautomatic welding of girth welding of pipe line steel completes.
But, because self-protection flux-cored wire is a kind of welding material under not having adscititious gases to protect, causes oxygen in weld metal, nitrogen equal size higher, often make the toughness of line pipe welding point often occur larger fluctuation.The self-protection flux-cored wire being applicable to high-grade pipe all-position welding of the present invention significantly improves Ni content compared to conventional welding wire; and optimize other alloying element contents; improve weldquality; improve weld metal toughness, especially can meet the field work demand of outdoor Large Diameter Pipeline pipe line steel.
Summary of the invention
The object of this invention is to provide a kind of high Ni self-protection flux-cored wire being applicable to high-grade pipe welding, the welding technological properties of this welding wire and excellent in mechanical performance, can meet the welding requirements of high-strength and high ductility pipe line steel.
The technical solution adopted in the present invention is; a kind of high Ni self-protection flux-cored wire being suitable for high-grade pipe all-position welding; comprise welding wire crust and the medicine core of mild-carbon steel strip; it is characterized in that; described medicine core medicinal powder formula according to mass percent is; fluoride 40% ~ 60%; oxide 10% ~ 22%; carbonate 1% ~ 8%; aluminium powder 0.5% ~ 2%, Al-Mg alloyed powder 12% ~ 18%, electrolytic manganese metal 3% ~ 10%, nickel powder 12% ~ 20%; metal zirconium 0.1% ~ 0.6%, vanadium iron 0% ~ 8% forms.
The diameter of welding wire of the present invention is 1.2 ~ 3.0mm, and the filling rate of medicine core powder is 15% ~ 30%.
This welding wire crust adopts common low carbon cold-rolled strip to prepare as raw material.
Fluoride of the present invention is the one or more combination in barium fluoride, calcirm-fluoride and lithium fluoride.
Carbonate of the present invention is one or both combinations in calcium carbonate and lithium carbonate.
The effect of several key component of the present invention is as follows:
Use a large amount of fluorides (40% ~ 60%) as gas making, slag former in the present invention, its main component is BaF
2and LiF.The compound of Ba can support very short electric arc in welding process, electric arc shorter during welding has the advantage of two aspects: one is when all-position welding, under a certain given electric current, reduce arc energy and welding wire melting rate, relatively little being convenient in molten bath controls; In addition, because electric arc is shorter, shorten molten drop through arc column required time, thus reduce the infringement of pernicious gas in air.
Oxide (Fe
2o
3, CeO
2), be very important a kind of component in self-protection flux-cored wire slag system, the improvement of welding technological properties and mechanical property is played a very important role.Fe
2o
3be strong oxidizer, can reduce remaining Al, and Al is to the very disadvantageous element of impact toughness, so Fe
2o
3add impact toughness made moderate progress, meanwhile, this redox reaction is exothermic reaction, can supplement the heat of welding arc in welding process.Add Fe
2o
3also can reduce the surface tension that end of welding first melt is dripped, reduce the resistance of droplet transfer, improve the physical property of slag, improve appearance of weld, make face of weld bright and clean.But, along with Fe
2o
3the raising of content, medicinal powder fusing point improves, and cause and splash comparatively greatly in welding process, electric arc is unstable.Research shows, Fe
2o
3addition should control 6% ~ 15%, thus be conducive to the processing performance of welding wire and mechanical property to be adjusted to optimum state.CeO
2can molten bath be purified, improve welding seam toughness, but work as CeO
2during more than 5%, cause in welding process and be mingled with, reduce toughness, weld fumes significantly increases simultaneously, is unfavorable for welding procedure.
Al-Mg alloy is deoxidier conventional in self-protection flux-cored wire.Therefore Mg add the addition that can reduce Al, thus be beneficial to the content controlling Al in deposited metal.In alloy, the boiling point of Mg is lower, produces Mg steam under the effect of welding arc, can reduce the nitrogen partial pressure in arc atmosphere, but consumption crosses the very large flue dust of conference generation, and splashing is increased.Al has deoxidation, nitrogen fixation, is conventional deoxidier and nitrogen fixation agent, effectively can prevent the generation of pore in weld seam, play a very good protection.Aluminium is again strong nitrogen fixation agent, and aluminium can generate stable nitride with nitrogen effect and be insoluble to liquid steel, thus effectively prevent oversaturated N in deposited metal and be combined into N2 bubble, has stopped deposited metal and has produced pore.
Mn is austenitizing stable element, can reduce the temperature of austenite to ferritic transformation.Along with the increase of Mn content, the quantity of acicular ferrite increases, and the quantity of pro-eutectoid ferrite and ferrite side plate reduces, and makes the grain size of acicular ferrite become more tiny, Mn also can improve the intensity of weld metal while improving weld metal toughness.Mn in welding wire can also play the effect of deoxidation, and can generate with reaction of Salmon-Saxl and stablize MnS, thus reduces the generation of low melting point phase FeS, is conducive to improving the heat resistanceheat resistant crackle of weld metal and the ability of lamellar tearing.Ni is austenite stabilizer element, and Ni is infinitely solid-solution in γ-Fe, in weld metal, also play solution strengthening effect, can improve austenite quenching degree, reduces phase transition temperature, promotes that ferrite bainite is formed, and optimizes form and the distribution of MA constituent element.Reduce the destruction of the toughness of the sclerosis phase MA constituent element of fragility.Thus effectively improve the impact flexibility of weld seam.
High Ni self-protection flux-cored wire of the present invention is applicable to the all-position welding of high-grade pipe, and has excellent impact flexibility.Volume of smoke and pernicious gas can not be generated in welding process, improve weldquality, effectively improve weld seam impact toughness.Especially the field work demand of outdoor Large Diameter Pipeline pipe line steel can be met.
Accompanying drawing explanation
Fig. 1 is the typical micro-organization chart of weld metal.
Detailed description of the invention
The present invention will be described to enumerate specific embodiment below; what be necessary to herein means out is that following concrete implementation step is only for the invention will be further described; do not represent limiting the scope of the invention, some nonessential amendments that other people make according to the present invention and adjustment still belong to protection scope of the present invention.
Here is specific embodiments of the invention:
Embodiment:
A kind of high Ni self-protection flux-cored wire being applicable to high-grade pipe welding; it adopts common commercially available cold-rolled low carbon steel steel steel band to be raw material; according to the difference of concrete welding pipe line steel; medicine core powder is prepared respectively according to certain ratio; after 120 ~ 300 DEG C of drying and processings, mix and according to 21 ~ 23% filling rate add to cold-rolled strip be crust welding wire in.Prepared 6 batches of welding wires altogether, gage of wire is 2.0mm.
Table 1 is low-carbon cold rolling steel band chemical component table used in welding wire preparation process of the present invention; table 2 is the self-protection flux-cored wire chemical component table being applicable to the welding of Hi-grade steel pipe line steel of the present invention; table 3 is embodiment of the present invention flux-cored wire welding used mother metal and welding procedure table, and table 4 is the deposited metal performance after adopting embodiment of the present invention welding.
The cold-rolled strip chemical composition (% by weight) of table 1 welding wire of the present invention
| Composition | C | Si | Mn | S | P |
| 0.035 | 0.01 | 0.25 | 0.004 | 0.009 |
Table 2 Hi-grade steel pipe line steel of the present invention self-protecting full position high ductility flux-cored wire drug core component table (% by weight)
Table 3 embodiment of the present invention flux-cored wire welding used mother metal and welding procedure table
Table 4 adopts the present invention to be compared with the prior art the performance comparison table of deposited metal after routine welding
As can be seen here, contrasting with conventional self-protection flux-cored wire, by improving nickel powder content in medicine core, the impact flexibility of weld metal can be made effectively to improve, not only mean value improves more than 20J, and impact flexibility numerical stability also has remarkable lifting.In addition, in welding process, the viscosity of slag and coagulating property are good, can all-position welding, are especially applicable to vertical downward weldering.Welding usability is good, and arc stability, penetration power are strong, and processing ease, appearance of weld is attractive in appearance.De-slag is good, splashes little.
In sum, the high Ni welded by self-shielded flux cord wire processing performance being applicable to high-grade pipe all-position welding of the present invention is good, and impact flexibility effectively improves, and especially can meet the field work demand of outdoor Large Diameter Pipeline pipe line steel.
Claims (5)
1. one kind is applicable to the high Ni self-protection flux-cored wire of high-grade pipe welding; comprise welding wire crust and the medicine core of mild-carbon steel strip; it is characterized in that, described medicine core medicinal powder formula according to mass percent is, fluoride 40% ~ 60%; oxide 10% ~ 22%; carbonate 1% ~ 8%, aluminium powder 0.5%-2%, Al-Mg alloyed powder 12% ~ 18%, electrolytic manganese metal 3% ~ 10%; nickel powder 12% ~ 25%, metal zirconium 0.1%-0.6%.
2. a high Ni self-protection flux-cored wire according to claim 1, it is characterized in that: the diameter of described welding wire is 1.2 ~ 3.0mm, the filling rate of medicine core powder is 15% ~ 30%.
3. high Ni self-protection flux-cored wire according to claim 1, is characterized in that, described fluoride is the one or more combination in barium fluoride, calcirm-fluoride and lithium fluoride.
4. high Ni self-protection flux-cored wire according to claim 1, is characterized in that, described carbonate is one or both combinations in calcium carbonate and lithium carbonate.
5. high Ni self-protection flux-cored wire according to claim 1, is characterized in that, this welding wire crust adopts common low carbon cold-rolled strip to prepare as raw material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510921250.3A CN105345315A (en) | 2015-12-11 | 2015-12-11 | High-Ni-content self-protection flux-cored wire for welding high-steel-grade pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510921250.3A CN105345315A (en) | 2015-12-11 | 2015-12-11 | High-Ni-content self-protection flux-cored wire for welding high-steel-grade pipeline |
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| Publication Number | Publication Date |
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| CN105345315A true CN105345315A (en) | 2016-02-24 |
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|---|---|---|---|
| CN201510921250.3A Pending CN105345315A (en) | 2015-12-11 | 2015-12-11 | High-Ni-content self-protection flux-cored wire for welding high-steel-grade pipeline |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106925918A (en) * | 2017-04-28 | 2017-07-07 | 天津市永昌焊丝有限公司 | A kind of new self-protection flux-cored wire for X80 pipe line steels |
| CN109530959A (en) * | 2018-11-21 | 2019-03-29 | 武汉铁锚焊接材料股份有限公司 | A kind of small dimension self-protection flux-cored wire and its application suitable for downhand welding and horizontal position welding |
| CN111805121A (en) * | 2020-08-26 | 2020-10-23 | 武汉科技大学 | Flux core for X70 pipeline steel, self-protection flux-cored wire and preparation method thereof |
| CN112935625A (en) * | 2021-02-05 | 2021-06-11 | 天津市金桥焊材集团股份有限公司 | High-toughness alkaline all-position flux-cored wire capable of adapting to plateau climate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1895839A (en) * | 2005-07-12 | 2007-01-17 | 林肯环球公司 | Barium and lithium ratio for flux cored electrode |
| CN101745754A (en) * | 2009-12-16 | 2010-06-23 | 天津大学 | Self-protecting flux-cored wire used for all position welding of X80 pipeline steel |
| JP2015217393A (en) * | 2014-05-14 | 2015-12-07 | 日鐵住金溶接工業株式会社 | Flux-cored wire for carbon dioxide gas shielded arc welding |
-
2015
- 2015-12-11 CN CN201510921250.3A patent/CN105345315A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1895839A (en) * | 2005-07-12 | 2007-01-17 | 林肯环球公司 | Barium and lithium ratio for flux cored electrode |
| CN101745754A (en) * | 2009-12-16 | 2010-06-23 | 天津大学 | Self-protecting flux-cored wire used for all position welding of X80 pipeline steel |
| JP2015217393A (en) * | 2014-05-14 | 2015-12-07 | 日鐵住金溶接工業株式会社 | Flux-cored wire for carbon dioxide gas shielded arc welding |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106925918A (en) * | 2017-04-28 | 2017-07-07 | 天津市永昌焊丝有限公司 | A kind of new self-protection flux-cored wire for X80 pipe line steels |
| CN109530959A (en) * | 2018-11-21 | 2019-03-29 | 武汉铁锚焊接材料股份有限公司 | A kind of small dimension self-protection flux-cored wire and its application suitable for downhand welding and horizontal position welding |
| CN109530959B (en) * | 2018-11-21 | 2021-03-26 | 武汉铁锚焊接材料股份有限公司 | Small-specification self-shielded flux-cored wire suitable for flat welding and transverse welding and application thereof |
| CN111805121A (en) * | 2020-08-26 | 2020-10-23 | 武汉科技大学 | Flux core for X70 pipeline steel, self-protection flux-cored wire and preparation method thereof |
| CN112935625A (en) * | 2021-02-05 | 2021-06-11 | 天津市金桥焊材集团股份有限公司 | High-toughness alkaline all-position flux-cored wire capable of adapting to plateau climate |
| CN112935625B (en) * | 2021-02-05 | 2023-02-21 | 天津市金桥焊材集团股份有限公司 | High-toughness alkaline all-position flux-cored wire capable of adapting to plateau climate |
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Application publication date: 20160224 |
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