CN106077908A - A kind of welding method of Centrifugal Casting Iron Pipe part - Google Patents

A kind of welding method of Centrifugal Casting Iron Pipe part Download PDF

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Publication number
CN106077908A
CN106077908A CN201610479447.0A CN201610479447A CN106077908A CN 106077908 A CN106077908 A CN 106077908A CN 201610479447 A CN201610479447 A CN 201610479447A CN 106077908 A CN106077908 A CN 106077908A
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Prior art keywords
welding
welding method
arc
iron pipe
centrifugal casting
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CN201610479447.0A
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CN106077908B (en
Inventor
金丽勇
李亚江
徐子军
刘洪亮
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State Grid Corp of China SGCC
Zibo Power Supply Co of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
Zibo Power Supply Co of State Grid Shandong Electric Power 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
    • 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
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • 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
    • B23K9/235—Preliminary treatment

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

Abstract

The invention discloses the welding method of a kind of Centrifugal Casting Iron Pipe part, comprise the steps: that (1) arc-shaped plate with nodular cast iron pipe fitting, as base material, welds and uses banjo fixing butt jointing, arcuately straight Y type groove is opened in inside sheet material or outside；(2) preheating at Welded Joints before weldering, preheating temperature is 100～150 DEG C；(3) CO is used2Gas shielded arc welding welding, welds first weld seam, continuous sequence at arc-shaped plate groove；Back weld seam uses backstep sequence welding；(4) postweld heat preservation, is slowly cooled to room temperature.The present invention uses CO2Novel centrifugal casting ductile iron pipe plate is welded in electrogas process under the conditions of low-temperature prewarming, compared with tradition welding rod arc soldering method, simplifies welding procedure, reduces production cost, significantly increase welding efficiency.

Description

A kind of welding method of Centrifugal Casting Iron Pipe part
Technical field
The present invention relates to welding technology field, be specifically related to the welding method of a kind of Centrifugal Casting Iron Pipe part.
Background technology
Along with the popularization of wind generating technology, domestic installed capacity of wind-driven power is continuously increased, and China has become scale in the world Bigger wind-power market and wind energy plant manufacture big country.Wind power generating set is typically by blade, generator bay, pylon, control system The part compositions such as system, gantry-type mainly has truss-like and tower two kinds of pipe.Lattice tower is cheap, but safeguards inconvenience. Pipe tower type pylon can use steel plate to roll and be welded, and forms the conical tube barrel structure that little bottom, top is big, internal installing staircase Straight-through cabin.Pipe tower type pylon has the feature such as compact conformation, safe and reliable, easy to maintenance, good looking appearance, wide by countries in the world General employing.In the construction of cities and towns work transmission line, overhead transmission line arranges the contradiction day between physical construction planning requirement Benefit is prominent, owing to being retrained by landform and building, and aerial line roadbed this employing steel pipe pole in city.At present, transmission of electricity steel pipe pole All using carbon steel structure and galvanizing preservative treatment, hot-galvanized steel structure shaft tower produces and exists in application process and asks as follows Topic: (1) self structure defect causes weight big, and construction costs raises；(2) corrosion resistance is poor, and anticorrosion treatment technology is complicated, cost is high With pollute environment, especially prominent in coastal area and industrial pollution district；(3) day-to-day operation maintenance cost is high.
The material that the tower wind tower pylon of pipe mainly uses at present is Q345D or Q345E low-alloy steel, has weldability Advantages such as good, mechanical property is good, but it is poor to there is also corrosion resistance, tower body corrosion and aging serious etc. not enough under the conditions of long service, And Financial cost is higher.
Nodular cast iron is a kind of high-strength cast iron material, obtains ball graphite by nodularization and inoculation, effectively carries The mechanical property of high cast iron, in particular improves plasticity and toughness.The spheroidal graphite cast-iron tubing that centrifugal casting technique is produced Structure substitutes traditional Q 345 low-alloy steel structure, is applied to wind-power electricity generation tower body manufacture, can improve the comprehensive mechanical property of tower body Can, reduce Financial cost simultaneously.But, in the welding process of nodular cast iron tubing, traditional SMAW efficiency is relatively Low, appearance of weld is poor, and needs to make cylinder iron welding rod special for special, and welding material relatively costly, postwelding effect is undesirable；Cast iron Middle carbon content is high, and the impurity content such as S, P is more, easily occurs that spoken parts in traditional operas, crackle, pore etc. lack during traditional SMAW Fall into, welding process generally to carry out 400～700 DEG C of preheatings, is also performed to post-weld annealed or normalized treatment if desired.Therefore, The welding procedure of spheroidal graphite cast-iron tubing is complicated, and welding cost is high, and this seriously constrains nodular cast iron tubing in wind-power electricity generation Application.
Summary of the invention
For above-mentioned prior art, it is an object of the invention to provide the welding method of a kind of Centrifugal Casting Iron Pipe part.
For achieving the above object, the present invention adopts the following technical scheme that
The welding method of a kind of Centrifugal Casting Iron Pipe part, comprises the steps:
(1) with the arc-shaped plate of nodular cast iron pipe fitting as base material, welding uses banjo fixing butt jointing, arcuately inside sheet material or outward Straight Y type groove is opened in side；
(2) preheating at groove before weldering, preheating temperature is 100～150 DEG C；Can reduce welding by preheating should Power, and weld strain speed, be conducive to avoiding producing weld crack, preheating temperature not only with steel and the chemical composition of welding rod Relevant, also relevant with welded rigidity, welding method and ambient temperature etc., conventional cast iron welding process need 350～ 600 DEG C of preheatings, preheating temperature is optimized, under above-mentioned relatively low low-temperature prewarming condition (100～150 DEG C), no by the present invention It is only capable of effectively reducing bead crack, also simplify welding procedure.
(3) CO is used2Gas shielded arc welding welding, welds first weld seam, continuous sequence, postwelding at arc-shaped plate groove Do not wait until the direct trimming back root of weld that cools down；Back weld seam uses backstep sequence welding；By aforesaid operations, can Effectively prevent crackle.
(4) postweld heat preservation, is slowly cooled to room temperature.
Preferably, in step (1), the thickness of described arc-shaped plate is 6～10mm；It is preferably 8mm.
In step (1), the groove angle one side 30 ° of described Y type groove, stays root face 2～3mm.Bevel angle is entered by the present invention Optimization of having gone is investigated, found that use above-mentioned groove type, can at utmost reduce the deposition amount of weld metal, it is to avoid produce Raw root crack, beneficially welding operation.
Preferably, in step (2), preheating uses oxy-acetylene flame heating.
Preferably, in step (3), CO2The welding condition of gas shielded arc welding is: weldingvoltage 18～22V, welding electricity Stream 105～140A, dry extension of electrode degree 10～15mm, wire feed rate 5～8m/min, speed of welding 12～30cm/min, CO2Gas Body purity 99.9%, gas flow 12～20L/min.
In step (3), CO2The welding wire that gas shielded arc welding is used is solid welding wire, and the chemical composition of solid welding wire is as follows:
It is calculated in mass percent, C 0.06～0.15%, Mn 1.40～1.85%, Si 1.50～2.00%, P≤ 0.025%, S≤0.025%, Ni 1.60～4.0%, Cr≤0.015%, Mo≤0.015%, V≤0.03%, Cu≤ 0.50%, Fe surplus.
In step (3), the weld seam interlayer temperature of continuous sequence controls at 90～110 DEG C, preferably 100 DEG C.
In step (3), described backstep sequence particularly as follows: be divided into 2～3 sections, every section of fusion length 8～15cm.By dividing Section welding can reduce heat input, effectively reduces stress and concentrates.
Described nodular cast iron pipe fitting is the ferrite base spheroidal graphite cast-iron that centrifugal casting technique produces, and Oxygen potential is more than 80%, Spheroidal graphite rank 7 grades.The chemical composition of described nodular cast iron pipe fitting is:
It is calculated in mass percent, C 3.5～3.7%, Si 2.1～2.3%, Mn 0.27%, P 0.061%, S 0.008 ～0.010%, Mg 0.050%, Fe surplus.
The mechanical property of above-mentioned nodular cast iron is: tensile strength 460MPa, percentage elongation 16%.
Beneficial effects of the present invention:
(1) present invention uses CO2Novel centrifugal casting ductile iron pipe is welded in electrogas process under the conditions of low-temperature prewarming Plate, compared with tradition welding rod arc soldering method, simplifies welding procedure, reduces production cost, significantly increase welding efficiency.
(2) rich in Mn, Si element in solid welding wire of the present invention, increase the alloy transition of weld metal, purify Molten bath, improves Microstructure of Weld Metal and mechanical property.Welding wire, rich in Ni element, improves weld(ing) deposit toughness, reduces welding Crackle is inclined to.
(3) present invention uses low thermal weld stress and the technique of segmentation welding, optimizes the microscopic structure of welding point, fall Low welding point chilling tendency, reduces stress and concentrates, and is conducive to obtaining the welding point that structure property is good.
Accompanying drawing explanation
Fig. 1: the joint form of magnesium iron arc gas shielded arc welding；
The weld joint on inner side pattern of centrifugal casting spheroidal graphite cast-iron in Fig. 2 a: embodiment 1；
The sealing run pattern of centrifugal casting spheroidal graphite cast-iron in Fig. 2 b: embodiment 1；
Fig. 3: welding point microstructure characteristic, wherein: (a) weld metal zone (b) fusion area (c) heat affected area；
Detailed description of the invention
The present invention is further illustrated in conjunction with the embodiments, it should explanation, following embodiment explanation merely to Explain the present invention, its content is not defined.
Embodiment 1:
Materials to be welded: the arc-shaped plate of the ferrite base nodular cast iron pipe fittings one section that centrifugal casting technique produces, specification is: Thickness of slab 8mm, the long 25cm of cambered surface, width 15cm.This magnesium iron chemical composition (mass percent) is: C 3.5～3.7%, Si 2.1 ～2.3%, Mn 0.27%, P 0.061%, S 0.008～0.010%, Mg 0.050%, Fe surplus.Mechanical property is: anti- Tensile strength 460MPa, percentage elongation 16%.
Welding procedure is as follows:
(1) welding uses banjo fixing butt jointing, opens straight Y type groove, one-way slope bicker inside the arc cross section of 25cm × 6mm 30 °, stay root face 2mm.Banjo fixing butt jointing form is as shown in Figure 1.
(2) use oxy-acetylene flame preheating before weldering, be preheating to 100 DEG C by magnesium iron arc plate groove.
(3) CO is used2Gas shielded arc welding welding, welding wire chemical composition following (mass percent): C 0.08%, Mn 1.80%, Si 2.00%, P≤0.025%, S≤0.025%, Ni 3.20%, Cr≤0.015%, Mo≤0.015%, V≤ 0.03%, Cu≤0.50%, Fe surplus.Gage of wireSolid welding wire.
Magnesium iron arc weld joint on inner side continuous sequence, uses welding parameter as follows: weldingvoltage 19V, welding current 115A, Dry extension of electrode degree 10mm, speed of welding 18cm/min, CO2Gas purity 99.9%, gas flow 12L/min.
Postwelding with emery wheel angle grinding machine cleaning back root of weld, at oxy-acetylene flame heated coupling, controls interlayer temperature immediately It is about 100 DEG C.
Back weld seam uses backstep, uses welding parameter as follows: weldingvoltage 20V, welding current 120A, and welding wire is done Elongation 10mm, speed of welding 15cm/min, CO2Gas purity 99.9%, gas flow 15L/min.First paragraph fusion length 12cm, by welding to the right in the middle of welding bead.The long 13cm of second segment weld seam, by welding to the left in the middle of welding bead.
(5) magnesium iron test plate (panel) is positioned in aluminium silicate insulation by postwelding, is slowly cooled to room temperature.
Postwelding carries out seam center observation and microscopic structure detection.Fig. 2 show welding bead and the back side inside magnesium iron arc The macro morphology of welding bead, finds through inspection, appearance of weld is good, flawless, gas hole defect.Metallographic examination is cut along seam cross-section Sample, polished and corrosion after carry out microstructure detection, Fig. 3 is the microstructure characteristic of welding point.Fusion area as shown in the figure Near have a certain degree of air chill district, but under this welding procedure, chilled zone width only has 300～500 μm, Welded Joints Combination property impact is inconspicuous., there is not obvious graphite clustering phenomena in welded seam area even tissue.
Embodiment 2:
Spheroidal graphite cast-iron plate two is secondary, and specification is as follows: thickness of slab 6mm, width 20cm, the long 10cm of cambered surface.Cross section along 20cm × 6mm Straight Y type groove, groove angle one side 30 degree, root face 2mm are opened in inner side.Use the CO of diameter phi 1.2mm solid welding wire2Gas shield Weldering.
Welding wire chemical composition mass percent used is as follows: C 0.08%, Mn 1.80%, Si 2.00%, P≤ 0.025%, S≤0.025%, Ni 3.20%, Cr≤0.015%, Mo≤0.015%, V≤0.03%, Cu≤0.50%, Fe Surplus.
(1) use oxy-acetylene flame preheating before weldering, at nodular cast iron plate groove, be preheating to 100 DEG C.
(2) weld joint on inner side uses CO2Gas shielded arc welding continuous sequence, employing welding parameter is: weldingvoltage 20V, welding Electric current 110A, dry extension of electrode degree 10mm, speed of welding 16cm/min, CO2Gas purity 99.9%, gas flow 16L/min.
(3) postwelding angle grinding mill sand wheel sheet cleaning back root of weld, oxy-acetylene flame computer heating control interlayer temperature is 100 DEG C.
(4) back weld seam segmentation welding, uses welding parameter as follows: weldingvoltage 20V, welding current 115A, and welding wire is done Elongation 10mm, speed of welding 18cm/min, CO2Gas purity 99.9%, gas flow 18L/min.It is divided into two sections of weldings, the One section of fusion length 10cm, by the left of welding bead to middle welding.The long 10cm of second segment weld seam, by welding to the right in the middle of welding bead.
(5) test plate (panel) is positioned in aluminosilicate material insulation slow cooling by postwelding, makes weldment be slowly cooled to room temperature.
Nodular Iron Welding joint appearance form after welding carries out seam center observation, good through inspection appearance of weld, The defects such as flawless, can meet its serviceability requirement.

Claims (10)

1. the welding method of a Centrifugal Casting Iron Pipe part, it is characterised in that comprise the steps:
(1) with the arc-shaped plate of nodular cast iron pipe fitting as base material, welding uses banjo fixing butt jointing, and arcuately inside sheet material or outside is opened Straight Y type groove；
(2) preheating at groove before weldering, preheating temperature is 100～150 DEG C；
(3) CO is used2Gas shielded arc welding welding, welds first weld seam, continuous sequence at arc-shaped plate groove；Back weld seam Use backstep sequence welding；
(4) postweld heat preservation, is slowly cooled to room temperature.
2. welding method as claimed in claim 1, it is characterised in that in step (1), the thickness of described arc-shaped plate be 6～ 10mm；It is preferably 8mm.
3. welding method as claimed in claim 1, it is characterised in that in step (1), the groove angle one side of described Y type groove 30 °, stay root face 2～3mm.
4. welding method as claimed in claim 1, it is characterised in that in step (3), CO2The welding procedure bar of gas shielded arc welding Part is: weldingvoltage 18～22V, welding current 105～140A, dry extension of electrode degree 10～15mm, wire feed rate 5～8m/ Min, speed of welding 12～30cm/min, CO2Gas purity 99.9%, gas flow 12～20L/min.
5. welding method as claimed in claim 1, it is characterised in that in step (3), CO2The welding wire that gas shielded arc welding is used For solid welding wire.
6. welding method as claimed in claim 5, it is characterised in that the chemical composition of described solid welding wire is as follows:
It is calculated in mass percent, C 0.06～0.15%, Mn 1.40～1.85%, Si 1.50～2.00%, P≤0.025%, S≤0.025%, Ni 1.60～4.0%, Cr≤0.015%, Mo≤0.015%, V≤0.03%, Cu≤0.50%, surplus is Fe。
7. welding method as claimed in claim 1, it is characterised in that in step (3), the weld seam interlayer temperature control of continuous sequence Make at 90～110 DEG C, preferably 100 DEG C.
8. welding method as claimed in claim 1, it is characterised in that in step (3), described backstep sequence is particularly as follows: divide It is 2～3 sections, every section of fusion length 8～15cm.
9. welding method as claimed in claim 1, it is characterised in that described nodular cast iron pipe fitting is that centrifugal casting technique produces Ferrite base spheroidal graphite cast-iron, Oxygen potential be more than 80%.
10. welding method as claimed in claim 9, it is characterised in that the chemical composition of described nodular cast iron pipe fitting is:
Be calculated in mass percent, C 3.5～3.7%, Si 2.1～2.3%, Mn 0.27%, P 0.061%, S 0.008～ 0.010%, Mg 0.050%, surplus is Fe.
CN201610479447.0A 2016-06-27 2016-06-27 A kind of welding method of Centrifugal Casting Iron Pipe part Active CN106077908B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110116256A (en) * 2019-05-24 2019-08-13 江苏格兰环境科技有限公司 A kind of welding procedure of centrifugally cast pipe
CN112188945A (en) * 2018-05-23 2021-01-05 西门子股份公司 Manufacture welding and maintenance welding of nodular cast iron
CN116352219A (en) * 2023-05-04 2023-06-30 南通泰胜蓝岛海洋工程有限公司 Water drop type tower drum and construction control system thereof

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CN102785004A (en) * 2012-09-10 2012-11-21 郑州市郑蝶阀门有限公司 Process for surfacing stainless steel sealing face on ductile cast iron valve base
CN102886593A (en) * 2012-10-17 2013-01-23 山东电力集团公司电力科学研究院 Welding method for Q460 high-strength steel tube of extra-high-voltage power transmission steel tube tower
CN102950362A (en) * 2012-07-03 2013-03-06 苏州张扬能源科技有限公司 Novel solar motor energy-storage tube welding method
CN103084702A (en) * 2013-02-05 2013-05-08 广东韶钢松山股份有限公司 Welding repair method for trolley breakage of sintering machine
CN104858555A (en) * 2015-06-10 2015-08-26 江苏力沛电力工程技术服务有限公司 Pressure pipeline welding process

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CN101543926A (en) * 2009-05-08 2009-09-30 常州海杰冶金机械制造有限公司 Overlaying welding technology of ductile cast iron roller
CN101905391A (en) * 2010-08-26 2010-12-08 宜昌猴王焊丝有限公司 Submerged arc welding wire of high tensile pipeline steel
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Publication number Priority date Publication date Assignee Title
CN112188945A (en) * 2018-05-23 2021-01-05 西门子股份公司 Manufacture welding and maintenance welding of nodular cast iron
CN110116256A (en) * 2019-05-24 2019-08-13 江苏格兰环境科技有限公司 A kind of welding procedure of centrifugally cast pipe
CN116352219A (en) * 2023-05-04 2023-06-30 南通泰胜蓝岛海洋工程有限公司 Water drop type tower drum and construction control system thereof
CN116352219B (en) * 2023-05-04 2024-04-30 南通泰胜蓝岛海洋工程有限公司 Water-drop type tower barrel assembly and water-drop type tower barrel construction method

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