CN102513724B - Gas shielded welding wire for all-position automatic welding of pipeline steel - Google Patents
Gas shielded welding wire for all-position automatic welding of pipeline steel Download PDFInfo
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- CN102513724B CN102513724B CN201110411696.3A CN201110411696A CN102513724B CN 102513724 B CN102513724 B CN 102513724B CN 201110411696 A CN201110411696 A CN 201110411696A CN 102513724 B CN102513724 B CN 102513724B
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- 238000003466 welding Methods 0.000 title claims abstract description 132
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 abstract description 27
- 239000002184 metal Substances 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 17
- 239000010936 titanium Substances 0.000 abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052748 manganese Inorganic materials 0.000 abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 7
- 229910052710 silicon Inorganic materials 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 abstract description 4
- 229910052719 titanium Inorganic materials 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052684 Cerium Inorganic materials 0.000 abstract description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 4
- 239000011572 manganese Substances 0.000 abstract 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 1
- 239000005864 Sulphur Substances 0.000 abstract 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 abstract 1
- 239000011574 phosphorus Substances 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 16
- 229910000859 α-Fe Inorganic materials 0.000 description 15
- 229910052717 sulfur Inorganic materials 0.000 description 7
- 238000010891 electric arc Methods 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000004021 metal welding Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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- Arc Welding In General (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
A gas shielded welding wire for all-position automatic welding of pipeline steel comprises the following components in Wt%: 0.08-0.1% of C (carbon), 0.7-1.0% of Si (silicon), 1.6-2.5% of Mn (manganese), less than 0.010% of P (phosphorus), less than 0.005% of S (sulphur), 0.5-1.0% of Ni (nickel), 0.2-0.4% of Mo (molybdenum), 0.04-0.1% of Ti (titanium), 0.1-0.4% of Ce (cerium) and the balance Fe (ferrum). By determining the reasonable component range of the elements of the C, the Mn, the Si, the Ni, the Mo, the Ti and the Ce, when the X80 pipeline steel is welded, weld metal has high strength and high low-temperature impact toughness, and the welding wire has excellent process properties and fine adaptability. The welding wire is applicable to all-position welding of the X80 pipeline steel, particularly suitable for automatically welding circumferential welds of the X80 pipeline steel, and completely suitable for site welding of the X80 pipeline steel for high-pressure oil and gas delivery pipelines.
Description
Technical Field
The invention relates to a gas shielded welding wire for pipeline steel, which is suitable for welding X80 grade pipeline steel full-position automatic welding, in particular to X80 grade pipeline steel girth welding.
Background
The X80 grade pipeline steel has high requirements on welding process performance of welding wires, mechanical properties of welding seams and production process, particularly, field circumferential welding seams are mainly completed by full-position automatic gas shield welding, and the welding method requires that the welding wires have high strength, high toughness and good welding process performance. When the pipeline steel is welded at all positions, welding is carried out from the 12-point position to the 6-point position, and the welding position is gradually changed from a flat welding state to a vertical welding state and then gradually changed to an overhead welding state. Along with the automatic change of the welding position, the electric arc needs to be ensured to be stable, the fluidity of the molten pool is moderate, the molten pool is ensured not to flow down at the position of 4-6 points, and the welding seam is formed beautifully. Therefore, the gas shielded solid welding wire for X80 grade pipeline steel is required to have good matching of strength and toughness and excellent welding process performance.
Disclosure of Invention
The technical problems solved by the invention are as follows: the gas shielded welding wire for the all-position automatic welding of the pipeline steel is provided, and the reasonable component ranges of C, Mn, Si, Ni, Mo, Ti and Ce elements are determined, so that when X80-grade pipeline steel is welded, weld metal has high strength, high low-temperature impact toughness, excellent welding process performance and good adaptability, the surfaces of the weld joints at different positions are smooth and uniform, and the appearance of the weld joint is attractive. The method is suitable for all-position welding of X80 grade pipeline steel, and is particularly suitable for girth welding of X80 grade pipeline steel.
The technical solution of the invention is as follows: a gas shielded welding wire for all-position automatic welding of pipeline steel comprises the following components in percentage by weight: 0.08 to 0.1 percent of C, 0.7 to 1.0 percent of Si, 1.6 to 2.5 percent of Mn, less than 0.010 percent of P, less than 0.005 percent of S, 0.5 to 1.0 percent of Ni, 0.2 to 0.4 percent of Mo, 0.04 to 0.1 percent of Ti, 0.1 to 0.4 percent of Ce0.1 to 0.4 percent of Fe and the balance of Fe. Wherein,
c is a main element for adjusting the strength of the weld metal, a certain content of C in the welding wire must be ensured, but the excessively high C element promotes the formation of high-carbon martensite, thereby influencing the crack resistance and impact toughness of the weld metal. Controlling the carbon element in a proper range is the basis for improving welding manufacturability and weld joint strengthening and toughening, and in a certain addition range of the C element, along with the increase of the C content, the arc stability is improved, the molten drop transition characteristic is improved, and the welding wire technological performance is improved, so that the C content in the welding wire is controlled within the range of 0.08-0.1%.
Mn is a welding wire strengthening element and a deoxidizing element, and oxides formed in the deoxidizing process can improve the strength and low-temperature impact toughness of weld metal and improve welding manufacturability. Mn is an austenite stabilizing element, the content of acicular ferrite in weld metal is obviously increased along with the increase of the content of Mn, the content of proeutectoid ferrite is reduced, the number of side plate bar ferrite is obviously reduced, and the acicular ferrite is refined, so that the content of Mn in the welding wire is controlled to be 1.6-2.5%.
Si is a deoxidizing element, the welding process performance is improved, the welding seam deposited metal strength is improved, when the Si content is low, the deoxidizing is insufficient, the oxygen content of the welding seam is too high, and the low-temperature impact toughness of the welding seam is affected; when a proper amount of Si element is added into the welding wire, the welding manufacturability of the welding wire can be improved, and the strength of welding seam metal can be improved; however, excessive Si element can harden the weld metal, reduce the low-temperature toughness of the weld metal, increase welding spatter and reduce the welding wire processing performance. The toughness of the deposited metal depends largely on the contents of Si and Mn, and the toughness may be lowered by too much or too little contents of Si and Mn. Therefore, the content of Mn and Si is in a proper range, which is beneficial to reducing the generation of non-metallic inclusions and improving the toughness, and the content of Si in the welding wire is controlled between 0.7 and 1.0 percent.
Ni is an element for improving the strength and low-temperature impact toughness of a welding line, the Ni can refine the structure to promote the formation of acicular ferrite, and plays an important role in strengthening the welding line metal, the influence of the Ni on the impact toughness in the welding line metal and the content of Mn have an interaction effect, and when the two elements are positioned in the optimal matching range, the corresponding welding line metal has excellent toughness matching, so that the addition of the Ni in the welding wire is determined to be 0.5-1.0% according to the addition of the Mn.
Mo can lower the phase transition temperature, inhibit the generation of proeutectoid ferrite, promote the transformation of acicular ferrite, increase the proportion of acicular ferrite and improve the precipitation strengthening effect of nitrides. Mo is in the range of 0.2-0.4% and is favorable for improving the obdurability, can change the gamma-alpha transformation characteristic, narrow the gamma-alpha transformation temperature range, reduce the amount of proeutectoid ferrite and obtain fine acicular ferrite.
Ti is an element for refining grains, and the addition of a proper amount of Ti has the effects of increasing the stability of an electric arc, improving the welding manufacturability and the welding seam structure of the welding wire and improving the low-temperature toughness of the material. Ti is added as a microalloy element at the same time, and the Ti and N in the parent metal form TiN particles during welding, so that not only can grains be refined, but also the formation of pro-eutectoid ferrite can be reduced, and the content of acicular ferrite is increased, therefore, the content of Ti is 0.04-0.1%.
The addition of a proper amount of rare earth element Ce can improve the size and the form of inclusions such as sulfide and the like in a welding seam, reduce the number of inclusions such as columnar crystals and reticular dendritic crystals and the like, purify the welding seam structure, refine crystal grains, improve the impact toughness of the welding seam and improve the welding process performance of the welding wire. The content of the rare earth element Ce in the welding wire components is 0.1-0.4.
S and P are harmful impurity elements, the impact toughness and the stress corrosion resistance of the weld metal are reduced, the content of the S and the P is strictly controlled to ensure that S, P in the weld metal is at a lower level, and the S is controlled to be less than 0.005 and the P is controlled to be less than 0.010 in the invention S, P.
The invention has the advantages and beneficial effects that:
1. the invention contains lower C element, higher Mn and Ni, proper amount of Si and Mo elements, and enlarges the transformation area of the acicular ferrite by adding Ti element, increases the acicular ferrite in the prior austenite crystal, thereby stably obtaining a large amount of acicular ferrite in the welding line. The comprehensive action of each element and rare earth elements enables the welding seam to achieve higher strength, good low-temperature impact toughness and good welding process performance.
2. The deposited metal of the invention has the following mechanical properties: the tensile strength (Rm) is more than or equal to 715MPa, the yield strength (Rel) is more than or equal to 625MPa, the elongation (A) is more than or equal to 22 percent, and the impact energy is more than or equal to 140J (-30 ℃).
3. The invention has good adaptability. The welding device is suitable for all-position welding of X80 grade pipeline steel, and is particularly suitable for semi-automatic welding and all-position automatic welding of X80 grade pipeline steel girth weld gas shield welding. The invention is applied to the pipeline circular weld automatic welding machine produced by the middle petroleum pipeline bureau to carry out the circular weld all-position welding test, the welding process performance is excellent, the electric arc stability, the all-position operation performance and the weld forming are good, the appearance of the circular weld is good, the shooting is qualified, and the mechanical property meets the welding technical specification of Q/SY-GJX0110 west two-line pipeline engineering lines.
4. The invention can replace the imported welding wire, can obviously save the construction cost of long-distance oil and gas conveying pipelines and generate great economic benefit.
The specific implementation mode is as follows:
the method adopts desulfurized molten iron, controls the sulfur content of the molten iron entering the furnace, selects raw materials with low S, P content, adopts converter steelmaking and top-bottom combined converting processes, controls C, S, P at the smelting end point at a lower level, adopts external refining processes such as an LF furnace and the like after deoxidation alloying, smelts molten steel with components meeting requirements, fully protects and casts the molten steel into continuous casting billets through a variety casting machine, and the continuous casting billets are rolled into wire rods with phi 4mm through a high-speed twistless rolling machine. The wire rod is made into finished welding wires with the diameter of 1.0mm, the diameter of 0.9mm or other specifications through shelling, acid cleaning, wire drawing and copper plating.
The first embodiment of the invention:
1. the welding wire comprises the following chemical components in percentage by weight (the balance being Fe):
2. the welding process comprises the following steps: the welding protective gas is argon-rich mixed gas of 80% Ar and 20% CO2. The welding current is 270A, the welding voltage is 29V, the welding speed is 30cm/min, and the gas flow is 20L/min. And (3) welding the deposited metal into six layers, wherein each layer has 8-10 welding lines, the welding line energy of backing welding is 16KJ/cm, the welding line energy of filling welding is 13.5KJ/cm, and the interlayer temperature is kept at about 150 ℃.
The experimental welding wire has good process performance, stable welding electric arc, small splashing, suitability for all-position welding, beautiful welding bead forming, no welding defects of air holes, slag inclusion, incomplete fusion and the like of a welding seam.
3. Mechanical property of welding wire deposited metal test: the deposited metal welding test is carried out according to the GB/T8110-2008 'carbon steel and low alloy steel welding wire for gas shielded arc welding'. Tensile, impact and metallographic specimens were prepared from the deposited metal according to standard requirements.
The mechanical properties of the deposited metal are as follows: the tensile strength (Rm) is 725MPa, the yield strength (Rel) is 660MPa, the elongation (a) is 23.4%, and the average impact energy is 149J (-30 ℃).
The second embodiment of the invention:
1. the welding wire comprises the following chemical components in percentage by weight (the balance being Fe):
| composition (I) | C | Mn | Si | S | P | Mo | Ni | Ce | Ti |
| Content (wt.) | 0.9 | 1.88 | 0.92 | 0.0036 | 0.0075 | 0.28 | 0.82 | 0.26 | 0.085 |
2. The welding process comprises the following steps: the welding protective gas is argon-rich mixed gas of 80% Ar and 20% CO2. The welding current is 270A, the welding voltage is 29V, the welding speed is 30cm/min, the gas flow is 20L/min, six layers of deposited metal are welded, 8-10 layers of deposited metal are welded, the welding line energy of backing welding is 16KJ/cm, and the welding line energy of filling welding is 13.5KJ/cm, and the interlayer temperature is kept at about 150 ℃.
The experimental welding wire has good process performance, stable welding electric arc, small splashing, suitability for all-position welding, beautiful welding bead forming, no welding defects of air holes, slag inclusion, incomplete fusion and the like of a welding seam.
3. Mechanical property of welding wire deposited metal test: the deposited metal welding test is carried out according to the GB/T8110-2008 'carbon steel and low alloy steel welding wire for gas shielded arc welding'. Tensile, impact and metallographic specimens were prepared from the deposited metal according to standard requirements.
The mechanical properties of the deposited metal are as follows: tensile strength (Rm) 715MPa, yield strength (Rel) 625MPa, elongation (a) 22.4%, and average impact energy 140J (-30 ℃).
The invention has good process performance, stable welding electric arc, small splashing, no air hole, beautiful welding bead forming, is suitable for all-position welding and can be widely used for the field welding of the X80 pipeline steel girth weld.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and therefore, all equivalent changes made by the contents of the claims of the present invention should be included in the claims of the present invention.
Claims (1)
1. A gas shielded welding wire for all-position automatic welding of pipeline steel is characterized by comprising the following components in percentage by weight: 0.088-0.1% of C, 0.7-1.0% of Si, 1.6-2.5% of Mn, less than 0.010% of P, less than 0.005% of S, 0.5-1.0% of Ni0.2-0.4% of Mo0.04-0.1% of Ti0.1-0.4% of Ce0.1-0.4; the balance being Fe.
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| CN201110411696.3A CN102513724B (en) | 2011-12-12 | 2011-12-12 | Gas shielded welding wire for all-position automatic welding of pipeline steel |
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| CN103862193B (en) * | 2014-02-21 | 2016-10-05 | 宝山钢铁股份有限公司 | A kind of high-strength and high ductility pipe line steel reality core gas protecting welding wire |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008018435A (en) * | 2006-07-11 | 2008-01-31 | Kobe Steel Ltd | Solid wire |
| CN101628366A (en) * | 2009-06-30 | 2010-01-20 | 西安理工大学 | Gas shielded welding wire for high-grade oil pipeline steel and preparation method thereof |
| CN101733584A (en) * | 2010-02-13 | 2010-06-16 | 宝鸡石油钢管有限责任公司 | High-strength submerged-arc welding wire for pipe line steel |
| CN101811234A (en) * | 2010-04-30 | 2010-08-25 | 宝鸡石油钢管有限责任公司 | Welding wire for gas shielded welding for high-strength pipe line steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4839193B2 (en) * | 2006-12-01 | 2011-12-21 | 株式会社神戸製鋼所 | Solid wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008018435A (en) * | 2006-07-11 | 2008-01-31 | Kobe Steel Ltd | Solid wire |
| CN101628366A (en) * | 2009-06-30 | 2010-01-20 | 西安理工大学 | Gas shielded welding wire for high-grade oil pipeline steel and preparation method thereof |
| CN101733584A (en) * | 2010-02-13 | 2010-06-16 | 宝鸡石油钢管有限责任公司 | High-strength submerged-arc welding wire for pipe line steel |
| CN101811234A (en) * | 2010-04-30 | 2010-08-25 | 宝鸡石油钢管有限责任公司 | Welding wire for gas shielded welding for high-strength pipe line steel |
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Effective date of registration: 20170524 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Co-patentee after: Baoji Petroleum Steel Pipe Co., Ltd. Patentee after: China National Petroleum Corporation Address before: 721000, 10 Tan Tan Road, Shaanxi, Baoji Patentee before: Baoji Petroleum Steel Pipe Co., Ltd. |
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Effective date of registration: 20170526 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Co-patentee after: Baoji Petroleum Steel Pipe Co., Ltd. Patentee after: China National Petroleum Corporation Address before: 721000, 10 Tan Tan Road, Shaanxi, Baoji Patentee before: Baoji Petroleum Steel Pipe Co., Ltd. |