CN104475935A - Field welding method for CO2-corrosion-resistant pipeline steel - Google Patents

Field welding method for CO2-corrosion-resistant pipeline steel Download PDF

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Publication number
CN104475935A
CN104475935A CN201410682803.XA CN201410682803A CN104475935A CN 104475935 A CN104475935 A CN 104475935A CN 201410682803 A CN201410682803 A CN 201410682803A CN 104475935 A CN104475935 A CN 104475935A
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welding
steel
corrosion
pipeline steel
welding method
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CN201410682803.XA
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CN104475935B (en
Inventor
李丽
尹雨群
张静
张显辉
赵晋斌
张苏强
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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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
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • 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
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B23K33/004—Filling of continuous seams
    • 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
    • B23K35/308—Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • 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
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
    • B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
    • 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
    • B23K2101/10—Pipe-lines
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Arc Welding In General (AREA)

Abstract

The invention discloses a field welding method for CO2-corrosion-resistant pipeline steel. The X65-level CO2-corrosion-resistant pipeline steel is selected, the thickness of the steel plate is 5-21 mm, and the steel plates with the same thickness are combined for butt joint; the 5Cr-Ni-Mo alloy system wire is selected, the diameter Phi of the wire is 2.4 mm, the chemical composition and weight percentage of the wire is as follows: C<=1.15%,Mn;0.2-1.0%,Si;0.10-0.60%,P<=0.015%,S<=0.010%,Cr;4.0-6.0%,Ni+Cu;0.2-2.2%, the balance is Fe and unavoidable impurities; the tungsten electrode inert gas is used for protecting multi-layer and multi-pass welding, the welding parameters are as follows: welding current 100-180 A, arc voltage 10-15 V, and the protective gas flow 10-15 L/min; the multi-layer and multi-pass continuous welding is used for the butt joint of the combined steel plate, until the welding line is covered. The technology of the field welding method is capable of welding the CO2-corrosion-resistant pipeline steel under the conditions without the preheat and post-weld heat treatment, the mechanical property of the welding joint is up to the level of the mechanical property of the X65 pipeline steel, and the welding joint has the good CO2-corrosion-resistant property, so the field welding construction condition of the CO2-corrosion-resistant pipeline steel is improved, and the production cost is reduced.

Description

A kind of anti-CO 2the Site Welding method of corroded pipeline steel
Technical field
The invention belongs to ferrous materials welding technology field, relate to a kind of anti-CO 2the Site Welding method of corroded pipeline steel.
Background technology
Along with developing rapidly of industrial gas oil, CO 2a subject matter of oil and gas exploitation, conveying is become to the etching problem of oil, gas pipeline.Control CO 2the method of corrosion mainly contains three kinds: add corrosion inhibiter, uses anticorrosion undercoating and uses corrosion resistant alloy steel, and wherein safeguard procedures are use corrosion resistant alloy steel the most safely and effectively.In recent years, the development of various countries to this type of steel also increases gradually, and main with low Cr steel steel, coordinates the elements such as Cu, Ni, Mo to be main, achieves comparatively quantum jump in engineer applied.The feature of this type of steel is not only have good anti-CO 2corrosive power (being about the 3-4 of ordinary carbon steel doubly), mechanical performance and weldability also can meet requirement of engineering, and price is far below the price of the like products such as stainless steel, and therefore development rapidly.But the solder technology slower development of such steel, at present for the anti-CO of X65 level 2corroded pipeline steel, market does not still have ripe welding technique; In addition, according to ASME VIII, BS3351 code, before the weldering of 10mm thick 5Cr-0.5Mo heat resisting steel, minimum preheat temperature should more than 150 DEG C, and postwelding must carry out the post weld heat treatment of about 700 DEG C, guarantee welding quality.No matter weld preheating or post weld heat treatment all add the difficulty of Site Welding, also increase construction cost.Relatively falling behind of solder technology greatly hinders the anti-CO of 5Cr system 2the application of corrosion steel.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of anti-CO 2the Site Welding method of corroded pipeline steel, the present invention adopts gas tungsten arc welding, and protective gas is 100%Ar, adopts the 5Cr-Ni-Mo alloy system welding wire of Φ 2.4mm simultaneously, welds anti-CO in not preheating with under not carrying out post weld heat treatment condition 2corroded pipeline steel, the mechanical property of welding point reaches X65 pipe line steel mechanical property level, and welding point has good anti-CO simultaneously 2corrosive nature, makes anti-CO 2corroded pipeline steel Site Welding execution conditions improve, and production cost reduces.
In order to solve above technical problem, the invention provides a kind of anti-CO 2the Site Welding method of corroded pipeline steel, comprises following concrete steps:
(1) the anti-CO of X65 level is selected 2corrosion pipe line steel, steel plate thickness is 5-21mm, and is identical thickness of slab combination docking; Select 5Cr-Ni-Mo alloy system welding wire, gage of wire Φ 2.4mm, welding wire chemical constituent and percentage by weight are: C≤0.05%, Mn:0.2-1.0%, Si:0.10-0.60%, P≤0.015%, S≤0.010%, Cr:4.0-6.0%, Ni+Cu:0.2-2.2%, surplus is Fe and inevitable impurity;
(2) adopt tungsten electrode noble gas protecting multi-pass welding, protective gas is Ar, its purity >99.9%; Groove adopts one side double V-groove, and bevel angle is 60 °, and groove gap is 0-1mm, and root face is 0-0.5mm;
(3) when environment temperature >=5 °, do not need preheating before welding, continuous welding, thermal weld stress amount controls at 6-18KJ/cm, and postwelding does not need to heat-treat; Welding condition: welding current 100-180A, arc voltage 10-15V, shield gas flow rate 10-15L/min; ; Multilayer multiple tracks continuous sequence is adopted, till weld seam fills up to combined steel plate banjo fixing butt jointing.
The technical scheme that the present invention limits further is:
Preferably, in step (1), welding wire chemical constituent and percentage by weight are: C:0.05%, Mn:0.2%, Si:0.10%, P:0.015%, S:0.010%, Cr:4.0%, Ni+Cu:0.2%, and surplus is Fe and inevitable impurity.
Preferably, in step (1), welding wire chemical constituent and percentage by weight are: C:0.01%, Mn:1.0%, Si:0.60%, P:0.005%, S:0.005%, Cr:6.0%, Ni+Cu:2.2%, and surplus is Fe and inevitable impurity.
Preferably, in step (1), welding wire chemical constituent and percentage by weight are: C:0.03%, Mn:0.6%, Si:0.30%, P:0.010%, S:0.008%, Cr:5.0%, Ni+Cu:1.2%, and surplus is Fe and inevitable impurity.
The invention has the beneficial effects as follows:
Present invention process adopts gas tungsten arc welding, and protective gas is 100%Ar, adopts the 5Cr-Ni-Mo alloy system welding wire of Φ 2.4mm simultaneously, welds anti-CO in not preheating with under not carrying out post weld heat treatment condition 2corroded pipeline steel, the mechanical property of welding point reaches X65 pipe line steel mechanical property level, and welding point has good anti-CO simultaneously 2corrosive nature, makes anti-CO 2corroded pipeline steel Site Welding execution conditions improve.
This technique is few to welding wire alloying element scaling loss, effectively can ensure each alloying element content in weld seam, and easily realize single face welding and double face shaping, more easily realize all-position welding, be particularly suitable for pipeline in-site installation; Welding joint mechanical property meets the anti-CO of X65 level simultaneously 2the mechanical property requirements of corroded pipeline steel: Rm>=550MPa, bending property (face curved, carry on the back curved) D=6a, 180 ° are qualified, impact flexibility KV2 (-20 DEG C)>=47J of Seam and heat effected zone; Welding point has good anti-CO 2corrosivity ability, welding point CO 2corrosion test evaluation display weld metal, fusion area, heat affected area and mother metal region occur without obvious etch pit, amplify 250 times of border coherent surface invariably observed between weld seam and underlying metal, and not preheating before weldering, postwelding is without the need to heat treatment, improve production efficiency, saved to become to produce cost.
Accompanying drawing explanation
Fig. 1 is the weld seam schematic diagram of embodiment 1;
Fig. 2 is the weld seam schematic diagram of embodiment 2;
Fig. 3 is the weld seam schematic diagram of embodiment 3.
Detailed description of the invention
Embodiment 1
The present embodiment provides a kind of anti-CO 2the Site Welding method of corroded pipeline steel, as shown in Figure 1, comprises following concrete steps:
(1) the anti-CO of X65 level is selected 2corrosion pipe line steel, steel plate thickness is 5mm, and test plate (panel) is of a size of 450mm × 400mm × 5mm, and is identical thickness of slab combination docking; Select 5Cr-Ni-Mo alloy system welding wire, gage of wire Φ 2.4mm, welding wire chemical constituent and percentage by weight are: C:0.05%, Mn:0.2%, Si:0.10%, P:0.015%, S:0.010%, Cr:4.0%, Ni+Cu:0.2%, surplus is Fe and inevitable impurity;
(2) adopt tungsten electrode noble gas protecting multi-pass welding, protective gas is Ar, its purity >99.9%; Groove adopts one side double V-groove, and bevel angle is 60 °, and groove gap is 0.3mm, and root face is 0mm;
(3) when environment temperature >=5 °, do not need preheating before welding, continuous welding, thermal weld stress amount controls at 6KJ/cm, and postwelding does not need to heat-treat; Welding condition: welding current 100A, arc voltage 10V, shield gas flow rate 10L/min; Multilayer multiple tracks continuous sequence is adopted, till weld seam fills up to the joint of 5mm+5mm combined steel plate.
Embodiment 2
The present embodiment provides a kind of anti-CO 2the Site Welding method of corroded pipeline steel, as shown in Figure 2, comprises following concrete steps:
(1) the anti-CO of X65 level is selected 2corrosion pipe line steel, steel plate thickness is 12mm, and test plate (panel) is of a size of 450mm × 400mm × 12mm, and is identical thickness of slab combination docking; Select 5Cr-Ni-Mo alloy system welding wire, gage of wire Φ 2.4mm, welding wire chemical constituent and percentage by weight are: C:0.01%, Mn:1.0%, Si:0.60%, P:0.005%, S:0.005%, Cr:6.0%, Ni+Cu:2.2%, surplus is Fe and inevitable impurity;
(2) adopt tungsten electrode noble gas protecting multi-pass welding, protective gas is Ar, its purity >99.9%; Groove adopts one side double V-groove, and bevel angle is 60 °, and groove gap is 0.8mm, and root face is 0.5mm;
(3) when environment temperature >=5 °, do not need preheating before welding, continuous welding, thermal weld stress amount controls at 12KJ/cm, and postwelding does not need to heat-treat; Welding condition: welding current 130A, arc voltage 12V, shield gas flow rate 12L/min; Multilayer multiple tracks continuous sequence is adopted, till weld seam fills up to the joint of 12mm+12mm combined steel plate.
Embodiment 3
The present embodiment provides a kind of anti-CO 2the Site Welding method of corroded pipeline steel, as shown in Figure 3, comprises following concrete steps:
(1) the anti-CO of X65 level is selected 2corrosion pipe line steel, steel plate thickness is 21mm, 450mm × 400mm × 21mm, and is identical thickness of slab combination docking; Select 5Cr-Ni-Mo alloy system welding wire, gage of wire Φ 2.4mm, welding wire chemical constituent and percentage by weight are: C:0.03%, Mn:0.6%, Si:0.30%, P:0.010%, S:0.008%, Cr:5.0%, Ni+Cu:1.2%, surplus is Fe and inevitable impurity;
(2) adopt tungsten electrode noble gas protecting multi-pass welding, protective gas is Ar, its purity >99.9%; Groove adopts one side double V-groove, and bevel angle is 60 °, and groove gap is 1mm, and root face is 1mm;
(3) when environment temperature >=5 °, do not need preheating before welding, continuous welding, thermal weld stress amount controls at 18KJ/cm, and postwelding does not need to heat-treat; Welding condition: welding current 180A, arc voltage 15V, shield gas flow rate 15L/min; Multilayer multiple tracks continuous sequence is adopted, till weld seam fills up to the joint of 21mm+21mm combined steel plate.
To the anti-CO of X65 level adopting above-mentioned welding method to weld in embodiment 1-3 2corroded pipeline steel banjo fixing butt jointing carries out mechanics properties testing, and testing result is in table 1.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.

Claims (4)

1. an anti-CO 2the Site Welding method of corroded pipeline steel, is characterized in that, comprises following concrete steps:
(1) the anti-CO of X65 level is selected 2corrosion pipe line steel, steel plate thickness is 5-21mm, and is identical thickness of slab combination docking; Select 5Cr-Ni-Mo alloy system welding wire, gage of wire Φ 2.4mm, described welding wire chemical constituent and percentage by weight are: C≤0.05%, Mn:0.2-1.0%, Si:0.10-0.60%, P≤0.015%, S≤0.010%, Cr:4.0-6.0%, Ni+Cu:0.2-2.2%, surplus is Fe and inevitable impurity;
(2) adopt tungsten electrode noble gas protecting multi-pass welding, protective gas is Ar, its purity >99.9%; Groove adopts one side double V-groove, and bevel angle is 60 °, and groove gap is 0-1mm, and root face is 0-0.5mm;
(3) when environment temperature >=5 °, do not need preheating before welding, continuous welding, thermal weld stress amount controls at 6-18KJ/cm, and postwelding does not need to heat-treat; Welding condition: welding current 100-180A, arc voltage 10-15V, shield gas flow rate 10-15L/min; Multilayer multiple tracks continuous sequence is adopted, till weld seam fills up to combined steel plate banjo fixing butt jointing.
2. anti-CO according to claim 1 2the Site Welding method of corroded pipeline steel, it is characterized in that, in described step (1), welding wire chemical constituent and percentage by weight are: C:0.05%, Mn:0.2%, Si:0.10%, P:0.015%, S:0.010%, Cr:4.0%, Ni+Cu:0.2%, surplus is Fe and inevitable impurity.
3. anti-CO according to claim 1 2the Site Welding method of corroded pipeline steel, it is characterized in that, in described step (1), welding wire chemical constituent and percentage by weight are: C:0.01%, Mn:1.0%, Si:0.60%, P:0.005%, S:0.005%, Cr:6.0%, Ni+Cu:2.2%, surplus is Fe and inevitable impurity.
4. anti-CO according to claim 1 2the Site Welding method of corroded pipeline steel, it is characterized in that, in described step (1), welding wire chemical constituent and percentage by weight are: C:0.03%, Mn:0.6%, Si:0.30%, P:0.010%, S:0.008%, Cr:5.0%, Ni+Cu:1.2%, surplus is Fe and inevitable impurity.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105149788A (en) * 2015-07-28 2015-12-16 北京工业大学 Laser welding method for ceramic-lined composite steel pipe
CN106695166A (en) * 2015-11-12 2017-05-24 海宁瑞奥金属科技有限公司 Gas shielded welding wire for ultra-high-strength corrosion-resistant pipelines

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CN101362263A (en) * 2008-09-19 2009-02-11 四川大西洋焊接材料股份有限公司 Electric welding rod for gas shielded welding X80 grade steel oil, gas transmission pipe
JP4319886B2 (en) * 2003-10-22 2009-08-26 新日本製鐵株式会社 Large heat input butt weld joint with brittle fracture resistance
CN101733580A (en) * 2008-11-18 2010-06-16 山东索力得焊材有限公司 800MPa-grade high-strength high-tenacity gas shielded welding wire
JP2010221297A (en) * 2009-02-25 2010-10-07 Jfe Steel Corp Welding method of thick steel plate
CN102218621A (en) * 2011-05-26 2011-10-19 四川大西洋焊接材料股份有限公司 Gas shielded welding wire used for X100 pipeline steel
CN102380694A (en) * 2011-09-15 2012-03-21 南京钢铁股份有限公司 Welding process for longitudinal weld joints of submerged-arc welding for high-strength pipeline steel
CN102500950A (en) * 2011-10-09 2012-06-20 四川大西洋焊接材料股份有限公司 Welding electrode for welding X65-grade pipeline steel
CN102848048A (en) * 2012-09-07 2013-01-02 龙口中集来福士海洋工程有限公司 Pipeline welding method
CN103121148A (en) * 2012-10-23 2013-05-29 中国石油天然气集团公司 Welding material and welding process for welding X100 pipeline steel
CN103143856A (en) * 2013-03-25 2013-06-12 武汉科技大学 Submerged-arc welding wire for CO2 (Carbon Dioxide) corrosion resistant high-strength pipeline steel

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JP4319886B2 (en) * 2003-10-22 2009-08-26 新日本製鐵株式会社 Large heat input butt weld joint with brittle fracture resistance
CN101362263A (en) * 2008-09-19 2009-02-11 四川大西洋焊接材料股份有限公司 Electric welding rod for gas shielded welding X80 grade steel oil, gas transmission pipe
CN101733580A (en) * 2008-11-18 2010-06-16 山东索力得焊材有限公司 800MPa-grade high-strength high-tenacity gas shielded welding wire
JP2010221297A (en) * 2009-02-25 2010-10-07 Jfe Steel Corp Welding method of thick steel plate
CN102218621A (en) * 2011-05-26 2011-10-19 四川大西洋焊接材料股份有限公司 Gas shielded welding wire used for X100 pipeline steel
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CN103121148A (en) * 2012-10-23 2013-05-29 中国石油天然气集团公司 Welding material and welding process for welding X100 pipeline steel
CN103143856A (en) * 2013-03-25 2013-06-12 武汉科技大学 Submerged-arc welding wire for CO2 (Carbon Dioxide) corrosion resistant high-strength pipeline steel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105149788A (en) * 2015-07-28 2015-12-16 北京工业大学 Laser welding method for ceramic-lined composite steel pipe
CN106695166A (en) * 2015-11-12 2017-05-24 海宁瑞奥金属科技有限公司 Gas shielded welding wire for ultra-high-strength corrosion-resistant pipelines

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