CN104175022A - Sintered flux for high-speed submerged arc welding of pressure steel pipes like pipelines and structural pipes - Google Patents
Sintered flux for high-speed submerged arc welding of pressure steel pipes like pipelines and structural pipes Download PDFInfo
- Publication number
- CN104175022A CN104175022A CN201410419281.4A CN201410419281A CN104175022A CN 104175022 A CN104175022 A CN 104175022A CN 201410419281 A CN201410419281 A CN 201410419281A CN 104175022 A CN104175022 A CN 104175022A
- Authority
- CN
- China
- Prior art keywords
- welding
- sintered flux
- pressure steel
- arc welding
- pipes
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
-
- 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
- B23K35/3607—Silica or silicates
-
- 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
- B23K35/362—Selection of compositions of fluxes
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
-
- 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 belongs to the technical field of pressure steel pipe welding and discloses sintered flux for high-speed submerged arc welding of pressure steel pipes like pipelines and structural pipes. The sintered flux is composed of, by weight, 8.0-20.0% of CaO, 10.0-30.0% of MgO, 20.0-40.0% of CaF2, 2.0-8.0% of Na2O, 1.0-5.0% of K2O, 1.0-5.0% of MnO, 0.1-1.0% of FeO, 20.0-30.0% of SiO2, 8.0-18.0% of Al2O3, 0.5-2.0% of TiO2 and 0.01-0.1% of ZrO2. Alkalinity of the sintered flux is 2.5-3.5. When being matched with a welding wire, the sintered flux can acquire hydroelectric pressure steel pipe welding joint meeting requirements of manufacturing of 100kg-class steel plates, and the welding joint is larger than or equal to 950MPa in tensile strength, larger than or equal to 47J in -60 DEC G impact energy and larger than or equal to 100J in 0 DEC G impact energy.
Description
Technical field
The invention belongs to penstock welding technology field, particularly relate to a kind of pipeline and structural tube equal pressure High-speed Steel Tube used for submerged arc welding sintered flux.
Background technology
Hydraulic power pressure steel pipe normally adopts and uses after submerged-arc welding tubulation, and along with hydropower installed capacity improves and the continuous propelling of minimizing process, hydraulic power pressure steel for steel pipes intensity rank improves constantly.Hydraulic power pressure steel pipe environment for use is severe, under repeated stock load, work for a long time, in order to guarantee the security of penstock, require it to there is enough toughness deposits, because armor plate strength and toughness are inverse relation, therefore the credit rating of steel plate used also improves with intensity, as 60kg grade steel plate requirement D level, 80kg grade steel plate requires E level, and 100kg grade steel plate requires F level.Because welding tube-making process may cause heat affected area microstructure coarsening, mechanical property is deteriorated, and likely introduces weld defect, so welding point becomes the weakest link of penstock conventionally, and its mechanical property directly determines the security of whole penstock.
80kg level hydraulic power pressure steel pipe progressively substitutes 60kg stage pressure steel pipe at present, and adopts the hydraulic power pressure steel pipe of 100kg grade steel plate manufacture just in the design phase.Because hydraulic power pressure steel pipe seam is long, straight weld, therefore all adopt submerged-arc welding to carry out tubulation, in order to make tough couplings such as submerged arc weld is strong with mother metal realization etc., adopt common welding material cannot meet the requirement of technique and Weld Performance, should adopt a kind of novel solder flux, reduce as far as possible the objectionable impurities such as S, P in weld seam, improve its degree of purity, guarantee that in welding, alloying component reaches effective transition, guarantee that it has good obdurability, adjust other components of solder flux simultaneously, realize optimization and the high-speed welding of welding procedure.
Summary of the invention
The object of the invention is to provide a kind of pipeline and structural tube equal pressure High-speed Steel Tube used for submerged arc welding sintered flux, is suitable for the used for submerged arc welding sintered flux using in the high speed submerged-arc welding of pipeline and structural tube equal pressure steel-pipe welding.
The composition of solder flux of the present invention is percentage meter by weight: 8.0～20.0%CaO, 10.0～30.0%MgO, 20.0～40.0%CaF
2, 2.0～8.0%Na
2o, 1.0～5.0%K
2o, 1.0～5.0%MnO, 0.1～1.0%FeO, 20.0～30.0%SiO
2, 8.0～18.0%Al
2o
3, 0.5～2.0%TiO
2, 0.01～0.1%ZrO
2, this flux basicity is 2.5～3.5, in solder flux S Control of Impurities in 0.006～0.008, P Control of Impurities below 0.015.During this alkalescence solder flux coupling welding wire, can obtain the welding line joint tensile strength >=950MPa of the hydraulic power pressure Steel Welded Joint requirement that adapts to the manufacture of 100kg grade steel plate ,-60 ℃ of ballistic work >=47J, 0 ℃ of ballistic work >=100J.
The present invention adopts numerical optimization processing method, for CaO, and MgO, CaF
2, Na
2o,K
2o, MnO, SiO
2, Al
2o
3, TiO
2deng being optimized combination, under higher basicity (2.5～3.5), butt welded seam carries out deoxidation, guarantee effective transition of the rear alloying component of welding, and the field trash in slag becomes the effective particle in weld seam crystallization process, and guarantee that weld grain degree obtains refinement, with this, improve the impact flexibility of weld seam.The strict harmful substances such as P, S of controlling in solder flux, guarantee that weld seam has stable performance and good degree of purity.
CaF
2can effectively reduce viscosity and the surface tension of basic clinker, improve the wettability of slag, improve the spreadability of slag to molten drop, molten bath, increase the mobility of slag, and be conducive to reduce liquid metal with the direct contact of arc atmosphere Atom hydrogen, can largely reduce the hydrogen-sucking amount of metal, and lower the gaseous impurity in weld seam, improve weld seam degree of purity.
MgO can improve the basicity of slag, increases the gas permeability of slag and reduces diffusible hydrogen content.In solder flux, improve (CaO+MgO)/SiO
2ratio (being not more than 3) when welding can increase the de-S ability in molten bath.As stable oxide, there is the capillary effect of the slag of increasing, can reach the effect of effective control weld seam processing performance.
CaO is as the main slag former of high-basicity sintered flux, stronger to the binding ability of S, P, can get rid of S in weld metal, P and reach content.Can avoid weld seam grain boundaries cracking and the impact flexibility of reduction weld seam.
Al
2o
3as slag making materials, its fusing point is higher, has the concentrative effect of the electric arc of raising.In sintered flux, can be used as the adjusting agent of slag viscosity, can adjust the mobility of slag, have the capillary effect of the slag of increase, content increase is more, and weld seam scalelike mark is more tiny, and de-slag is easier.
MnO, SiO
2as deoxidation and to the various physical characteristic adjustment of slag, exist.SiO wherein
2can reduce the basicity of slag, and because it can be combined into compound with most basic anhydride in slag, so along with its content raises, easily cause that slag viscosity increases, but along with content in solder flux improves, can cause that basicity declines, and occur, to the phenomenon of transition Si in weld seam molten bath, causing that weld seam impact toughness declines; MnO can reduce the fusing point of slag, improves the mobility of slag, reduces surface tension, is conducive to appearance of weld.Its metallurgical reaction under high alkalinity, reduzate, to transition Mn in weld seam, plays the effect that improves weld strength and toughness, and can be combined with S and form MnS, plays certain desulfidation.
By the effective adjustment to each composition in solder flux, during penstock submerged arc welding, there is not molten bath loss, time slag, welding bead smooth surface, the good formability of weld seam while reaching high-speed welding, and effectively reduced the scaling loss of alloy, remove the objectionable impurities in weld seam.
When this alkaline solder flux carries out the hydraulic power pressure steel pipe submerged arc welding of 100kg grade steel plate manufacture with the high strength welding wire mating, can guarantee to there is good forming property and deslag performance, welding bead smooth surface, transition is good, reduces the occurrence probability of weld defect.The welding line joint that can obtain the hydraulic power pressure Steel Welded Joint requirement that adapts to the manufacture of 100kg grade steel plate, has good low-temperature flexibility, can guarantee the security that 100kg stage pressure steel pipe is on active service, and welding procedure adaptability meets site operation requirement, easily promotes.
Accompanying drawing explanation
Fig. 1 is 30mm divided edge of steel plate schematic diagram.
Fig. 2 is 20mm divided edge of steel plate schematic diagram.
The specific embodiment
Embodiment 1:
Flux constituent that submerged-arc welding adopts: 10.0%CaO, 18.0%MgO, 30.0%CaF
2, 4.0%Na
2o, 2.0%K
2o, 1.0%MnO, 0.4%FeO, 21%SiO
2, 11.0%Al
2o
3, 1.0%TiO
2, 0.03%ZrO
2.
The welding wire adopting is 100kg grade high-strength welding wire for submerged-arc welding, and test piece for welding is the thick Q890 steel plate of 30mm, and test plate (panel) is opened asymmetry X-groove, and as shown in Figure 1, plate size is 600mm * 200mm * 30mm to groove, stays 2mm root face, and two plates do not stay gap.
By the thick Q890 steel plate of 30mm+30mm, weld preheating to 120 ℃, interlayer temperature is controlled at 160～180 ℃, before weldering, groove is shown in to light with abrasive machine polishing, adopts submerged-arc welding to carry out bottoming, filling, capping.The back side adopts emery wheel to enter to weld to be filled to after row Cheongju root to be filled up.
Backing run welding current is controlled at 450～500A, and weldingvoltage is controlled at 24～27V, and speed of welding is controlled at 350～400mm/min; Filler pass welding current is controlled at 550～600A, and weldingvoltage is controlled at 26～29V, and weldering speed control is built in 300～350mm/min, and sweating heat input control is at 30kJ/cm.
Postwelding is not found weld defect through flaw detection, welding deformation is less than 3 °, Welded Joints carries out mechanical properties test, and result shows, joint tensile strength is 980MPa, through 180 °, crackle is not found in d=4a clod wash, weld seam-60 ℃ ballistic work 77J, 0 ℃ of ballistic work 110J, heat affected area-60 ℃ ballistic work 155J, 0 ℃ of ballistic work 175J.
Embodiment 2:
Flux constituent that submerged-arc welding adopts: 10.0%CaO, 18.0%MgO, 30.0%CaF
2, 4.0%Na
2o, 2.0%K
2o, 1.0%MnO, 0.4%FeO, 21%SiO
2, 11.0%Al
2o
3, 1.0%TiO
2, 0.03%ZrO
2.
The welding wire adopting is 100kg grade high-strength welding wire for submerged-arc welding, and test piece for welding is the thick Q890 steel plate of 30mm, and test plate (panel) is opened double V-groove, and as shown in Figure 2, plate size is 600mm * 200mm * 20mm to groove, stays 2mm root face, and two plates do not stay gap.
By the thick Q890 steel plate of 20mm+20mm, weld preheating to 100 ℃, interlayer temperature is controlled at 160～180 ℃, before weldering, groove is shown in to light with abrasive machine polishing, adopts submerged-arc welding to carry out bottoming, filling, capping.The back side adopts emery wheel to enter to weld to be filled to after row Cheongju root to be filled up.
Backing run welding current is controlled at 450～500A, and weldingvoltage is controlled at 24～27V, and speed of welding is controlled at 350～400mm/min; Filler pass welding current is controlled at 550～600A, and weldingvoltage is controlled at 26～29V, and weldering speed control is built in 300～350mm/min, and sweating heat input control is at 25kJ/cm.
Postwelding is not found weld defect through flaw detection, welding deformation is less than 3 °, Welded Joints carries out mechanical properties test, and result shows, joint tensile strength is 971MPa, through 180 °, crackle is not found in d=4a clod wash, weld seam-60 ℃ ballistic work 82J, 0 ℃ of ballistic work 105J, heat affected area-60 ℃ ballistic work 147J, 0 ℃ of ballistic work 168J.
Claims (3)
1. pipeline and a structural tube equal pressure High-speed Steel Tube used for submerged arc welding sintered flux, is characterized in that: composition by weight percentage contains 8.0～20.0%CaO 10.0～30.0%MgO, 20.0～40.0%CaF
2, 2.0～8.0%Na
2o, 1.0～5.0%K
2o, 1.0～5.0%MnO, 0.1～1.0%FeO, 20.0～30.0%SiO
2, 8.0～18.0%Al
2o
3, 0.5～2.0%TiO
2, 0.01～0.1%ZrO
2.
2. solder flux according to claim 1, is characterized in that: flux basicity is 2.5～3.5.
3. solder flux according to claim 1, is characterized in that: according to mass percent, in solder flux S Control of Impurities in 0.006～0.008, P Control of Impurities below 0.015.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410419281.4A CN104175022A (en) | 2014-08-22 | 2014-08-22 | Sintered flux for high-speed submerged arc welding of pressure steel pipes like pipelines and structural pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410419281.4A CN104175022A (en) | 2014-08-22 | 2014-08-22 | Sintered flux for high-speed submerged arc welding of pressure steel pipes like pipelines and structural pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104175022A true CN104175022A (en) | 2014-12-03 |
Family
ID=51956520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410419281.4A Pending CN104175022A (en) | 2014-08-22 | 2014-08-22 | Sintered flux for high-speed submerged arc welding of pressure steel pipes like pipelines and structural pipes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104175022A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108195865A (en) * | 2018-03-29 | 2018-06-22 | 兰州兰石检测技术有限公司 | For the submerged arc welding flux standard sample and preparation method of X-ray fluorescence spectra analysis |
| CN111886109A (en) * | 2018-03-29 | 2020-11-03 | 株式会社神户制钢所 | Flux for submerged arc welding |
| CN113695789A (en) * | 2021-10-28 | 2021-11-26 | 东北大学 | Sintered flux for welding HSLA steel and preparation method thereof |
| CN114273818A (en) * | 2022-01-24 | 2022-04-05 | 昆山京群焊材科技有限公司 | Submerged arc welding wire and welding flux for 1.25% Cr-0.5% Mo-V steel in coal chemical industry |
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| JPS50139043A (en) * | 1974-04-26 | 1975-11-06 | ||
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| US20060196919A1 (en) * | 2005-03-04 | 2006-09-07 | Lincoln Global, Inc., A Delaware Corporation | Welding flux |
| CN102218623A (en) * | 2011-05-26 | 2011-10-19 | 四川大西洋焊接材料股份有限公司 | Welding flux for X100 pipe line steel submerged arc-welding and preparation method thereof |
| CN102909492A (en) * | 2012-10-17 | 2013-02-06 | 西安理工大学 | High-welding-speed sintered flux for submerged-arc welding of X100 pipeline steel and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108195865A (en) * | 2018-03-29 | 2018-06-22 | 兰州兰石检测技术有限公司 | For the submerged arc welding flux standard sample and preparation method of X-ray fluorescence spectra analysis |
| CN111886109A (en) * | 2018-03-29 | 2020-11-03 | 株式会社神户制钢所 | Flux for submerged arc welding |
| CN113695789A (en) * | 2021-10-28 | 2021-11-26 | 东北大学 | Sintered flux for welding HSLA steel and preparation method thereof |
| CN113695789B (en) * | 2021-10-28 | 2022-02-22 | 东北大学 | Sintered flux for welding HSLA steel and preparation method thereof |
| CN114273818A (en) * | 2022-01-24 | 2022-04-05 | 昆山京群焊材科技有限公司 | Submerged arc welding wire and welding flux for 1.25% Cr-0.5% Mo-V steel in coal chemical industry |
| CN114273818B (en) * | 2022-01-24 | 2023-11-28 | 昆山京群焊材科技有限公司 | Submerged arc welding wire for 1.25% Cr-0.5% Mo-V steel in coal chemical industry and welding flux |
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Application publication date: 20141203 |