CN102873502A - Flat-mounted flange single welding joint connecting method of nodular graphite cast iron flanged pipe - Google Patents
Flat-mounted flange single welding joint connecting method of nodular graphite cast iron flanged pipe Download PDFInfo
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- CN102873502A CN102873502A CN2012103880339A CN201210388033A CN102873502A CN 102873502 A CN102873502 A CN 102873502A CN 2012103880339 A CN2012103880339 A CN 2012103880339A CN 201210388033 A CN201210388033 A CN 201210388033A CN 102873502 A CN102873502 A CN 102873502A
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Abstract
The invention disclose a flat-mounted flange single welding joint connecting method of a nodular graphite cast iron flanged pipe. The method comprises the following steps of: cutting and machining a nodular cast iron pipe, machining a nodular graphite cast iron flange, assembling the flange, machining sealing surfaces of both ends of a nodular graphite cast iron flanged pipe, and performing a hydraulic test. According to the invention, through flat mounting and single welding joint connection of the nodular cast iron pipe and the nodular graphite cast iron flange, a sealing gasket is compressed jointly by the flange sealing surface and the cast iron pipe wall sectional surface through docking thereof to play the sealing effect, which avoids the risk of producing a welding joint crack due to the existing residual stress interaction of double welding joints, and solves the problem of penetrable slag blisters and microcracks in the welding joint. In hydraulic tests with different hydraulic levels, results show that the nodular graphite cast iron flange produced by the method is fully qualified, and the flange has the characteristics of high production efficiency, low production cost, and reliable sealing property, and is particularly applicable to welding processing of nodular graphite cast iron flanged pipes with the specification of DN80-DN600.
Description
Technical field
The invention belongs to the ductile iron pipe manufacture field, be specifically related to the method for attachment of a kind of spheroidal graphite cast-iron flanged pipe paperback flange list weld seam.
Background technology
Traditional spheroidal graphite cast-iron flanged pipe all is to adopt the assembling of flange projection, adopts inside and outside two pass girth joint to seal after the assembling, as shown in Figure 1; Because the interaction of two weld residual stresses very easily cracks, and causes flanged joint to leak, and causes serious quality problems.
Summary of the invention
Two weld seam methods of attachment improve purpose of the present invention to existing spheroidal graphite cast-iron flanged pipe exactly, the method of attachment of a kind of spheroidal graphite cast-iron flanged pipe paperback flange list weld seam is provided, this method by ductile iron pipe and flange interference fit and adopt single weld seam so that pull-out force to be provided, keep concordant with cast iron pipe otch section during the flange assembling, only weld outside weld.Rely on sealing gasket that concordant interface is covered fully when flanged pipe connects and seal, solved the two weld residual stresses of existing welded flange pipe postwelding and interacted to crack and the hidden danger of quality that weld seam leaks occurs.Improved production efficiency, reduced production cost, made the flanged pipe sealing property more reliable.
A kind of spheroidal graphite cast-iron flanged pipe paperback flange list weld seam of the present invention method of attachment comprises the steps:
1. cutting: ductile iron pipe to be processed is cut the mm of Cutting Length=final demand length+(8-10);
2. the ductile iron pipe machine adds: cast iron pipe mating surface 100% is seen light, and cast iron pipe cutting section machine adds concordant; Machine adds
The mm of rear length=final demand length+(4-6);
3. the spheroidal graphite cast-iron flange machine adds: according to step b) the cast iron pipe mating surface size of gained, press the casting of dimension spheroidal graphite
The corresponding magnitude of interference machine of iron flange pipe adds the flange endoporus; And flange sealing surface carried out roughing, sealing platform height keeps the 2-2.5mm machine and adds surplus;
4. assembling: after flange heats, that flange sealing surface is concordant with the assembling of cast iron pipe section;
5. weld outside weld;
6. the sealed at both ends face of cast iron flange pipe is carried out machine and add, guarantee the flanged pipe final lengths;
7. according to each requirement, to the spheroidal graphite cast-iron flanged pipe that is soldered carry out the water pressure test, anticorrosive coat brushing, check,
The packing warehouse-in.
Mechanical processing technique in the above-mentioned technique requires as follows:
1. before the ductile iron pipe machine added, reply cast iron pipe ovality was confirmed, should carry out the school circle in the time of can't meeting the demands,
The cast iron pipe ovality is controlled in the 2-3mm, and machine adds rear assurance mating surface 100% and sees light;
2. the spheroidal graphite cast-iron flange machine adds: guarantee flange mating surface size in strict accordance with technique interference degree, flange sealing surface is protected
Stay machine to add surplus; Flange machine adds should guarantee the vertical of flange inner hole centreline and flange sealing surface.Flange machine adds rear inspection technique
Whether blue neck top position while welding exists the casting flaws such as the pore that is difficult to repair or weld, slag blister, undesirable
Abandon;
3. the whole processing of flanged pipe that welding is good should guarantee that the depth of parallelism of paperback sealing surface and perpendicularity satisfy technological requirement.
The inventive method is connected with paperback and single weld seam of spheroidal graphite cast-iron flange by ductile iron pipe, dock common press seal by concordant flange sealing surface with cast iron pipe tube wall section and pave sealing function, avoid existing two pass weld residual stress to interact and produced the risk of bead crack, solved the seepy question that penetrability slag blister, micro-crack cause in the weld seam.The spheroidal graphite cast-iron flanged pipe that use this method produces is through the water pressure test of different hydraulic pressure grades, and the result shows fully qualified, has the production efficiency height, and production cost is low, the reliable characteristics of sealing property.
Description of drawings
Fig. 1 is the spheroidal graphite cast-iron flanged pipe structural representation that existing two weld seam method of attachment is produced;
Fig. 2 is the spheroidal graphite cast-iron flanged pipe structural representation that the single weld seam method of attachment of the present invention is produced.
Among the figure: 1-ductile iron pipe, 2-spheroidal graphite cast-iron flange, 3-flange sealing surface, 4-outside weld, 5-inside weld, 6-sealing gasket.
The specific embodiment
Referring to Fig. 2, present embodiment is processed as example with DN80-DN300 spheroidal graphite cast-iron flanged pipe, and its finished product length is 1000mm, and concrete steps are as follows:
A) cutting: ductile iron pipe to be processed 1 is cut, and Cutting Length is 1010 mm;
B) the ductile iron pipe machine adds: the ovality to cast iron pipe is confirmed, after meeting the requirements, with the cast iron pipe mating surface
100% sees light; Cast iron pipe cutting section machine adds concordant, and it is 1006mm that machine adds rear length;
C) spheroidal graphite cast-iron flange 2 machines add: according to step b) in machine add rear cast iron pipe mating surface size, add the flange endoporus by the corresponding 0.2-0.5mm magnitude of interference of DN80-DN300 spheroidal graphite cast-iron flanged pipe machine; Flange sealing surface 3 is carried out roughing, and sealing platform height keeps the 2mm machine and adds surplus; Flange machine adds should guarantee the vertical of flange inner hole centreline and flange sealing surface; Machine adds rear control flange neck top position while welding and whether has the casting flaws such as the pore that is difficult to repair or weld, slag blister, undesirable abandoning;
D) assembling: after flange heats, that flange sealing surface is concordant with the assembling of cast iron pipe section;
E) welding outside weld 4;
F) the sealed at both ends face of cast iron flange pipe is carried out machine and add, guarantee that the flanged pipe final lengths is 1000mm;
G) according to customer requirement, to the spheroidal graphite cast-iron flanged pipe that is soldered carry out the water pressure test, anticorrosive coat brushing, check,
The packing warehouse-in.
Claims (1)
1. spheroidal graphite cast-iron flanged pipe paperback flange list weld seam method of attachment is characterized in that comprising the steps:
A) cutting: ductile iron pipe to be processed is cut the mm of Cutting Length=final demand length+(8-10);
B) the ductile iron pipe machine adds: cast iron pipe mating surface 100% is seen light, and cast iron pipe cutting section machine adds concordant; Machine adds the mm of rear length=final demand length+(4-6);
C) the spheroidal graphite cast-iron flange machine adds: according to step b) the cast iron pipe mating surface size of gained, add the flange endoporus by the corresponding magnitude of interference machine of dimension spheroidal graphite cast-iron flanged pipe; And flange sealing surface carried out roughing, sealing platform height keeps the 2-2.5mm machine and adds surplus;
D) assembling: after flange heats, that flange sealing surface is concordant with the assembling of cast iron pipe section;
E) welding outside weld;
F) the sealed at both ends face of cast iron flange pipe is carried out machine and add, guarantee the flanged pipe final lengths;
G) according to customer requirement, the spheroidal graphite cast-iron flanged pipe that is soldered is carried out the water pressure test, anticorrosive coat brushing, check, packing warehouse-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103880339A CN102873502A (en) | 2012-10-15 | 2012-10-15 | Flat-mounted flange single welding joint connecting method of nodular graphite cast iron flanged pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103880339A CN102873502A (en) | 2012-10-15 | 2012-10-15 | Flat-mounted flange single welding joint connecting method of nodular graphite cast iron flanged pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102873502A true CN102873502A (en) | 2013-01-16 |
Family
ID=47475135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103880339A Pending CN102873502A (en) | 2012-10-15 | 2012-10-15 | Flat-mounted flange single welding joint connecting method of nodular graphite cast iron flanged pipe |
Country Status (1)
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| CN (1) | CN102873502A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014176761A1 (en) * | 2013-05-01 | 2014-11-06 | 南通长航船舶配件有限公司 | Marine butt-welded flange |
| CN107717250A (en) * | 2017-10-10 | 2018-02-23 | 固安县惠民塑料滤业有限公司 | A kind of connection method for Johnson's pipe being used in backwash filter |
| CN111230417A (en) * | 2020-02-25 | 2020-06-05 | 湖北理工学院 | Welding process for nodular cast iron pipe flange pipe |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE875108C (en) * | 1948-10-02 | 1953-04-30 | Gewerkschaft Reuss | Self-centering pipe connection for offset pipelines or the like. |
| GB1443810A (en) * | 1973-12-03 | 1976-07-28 | British Steel Corp | Falnged ductile iron pipes and the production thereof |
| CN2088605U (en) * | 1991-05-16 | 1991-11-13 | 泰县科技实验工厂 | Split type air inlet pipe |
| CN201028188Y (en) * | 2007-03-29 | 2008-02-27 | 贵阳铝镁设计研究院 | Flange for preventing rain permeating in seam |
| CN201264480Y (en) * | 2008-08-12 | 2009-07-01 | 福建畅丰车桥制造有限公司 | Casing tube type end head flange shaft |
| CN101592265A (en) * | 2009-07-03 | 2009-12-02 | 郑州神牛铸造有限公司 | Bimetal wear resistant composite tube |
| CN201455645U (en) * | 2009-07-16 | 2010-05-12 | 黄石新兴管业有限公司 | Cast pipe and flange centering machine |
| CN101749503A (en) * | 2009-12-29 | 2010-06-23 | 西安向阳航天材料股份有限公司 | Duplex metal compound flange pipe fitting having flange connection on end and manufacturing method thereof |
-
2012
- 2012-10-15 CN CN2012103880339A patent/CN102873502A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE875108C (en) * | 1948-10-02 | 1953-04-30 | Gewerkschaft Reuss | Self-centering pipe connection for offset pipelines or the like. |
| GB1443810A (en) * | 1973-12-03 | 1976-07-28 | British Steel Corp | Falnged ductile iron pipes and the production thereof |
| CN2088605U (en) * | 1991-05-16 | 1991-11-13 | 泰县科技实验工厂 | Split type air inlet pipe |
| CN201028188Y (en) * | 2007-03-29 | 2008-02-27 | 贵阳铝镁设计研究院 | Flange for preventing rain permeating in seam |
| CN201264480Y (en) * | 2008-08-12 | 2009-07-01 | 福建畅丰车桥制造有限公司 | Casing tube type end head flange shaft |
| CN101592265A (en) * | 2009-07-03 | 2009-12-02 | 郑州神牛铸造有限公司 | Bimetal wear resistant composite tube |
| CN201455645U (en) * | 2009-07-16 | 2010-05-12 | 黄石新兴管业有限公司 | Cast pipe and flange centering machine |
| CN101749503A (en) * | 2009-12-29 | 2010-06-23 | 西安向阳航天材料股份有限公司 | Duplex metal compound flange pipe fitting having flange connection on end and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 周焕平 等: "电弧冷焊在球墨铸铁管道生产中的应用", 《焊接技术》, vol. 36, no. 4, 31 August 2007 (2007-08-31), pages 79 - 81 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014176761A1 (en) * | 2013-05-01 | 2014-11-06 | 南通长航船舶配件有限公司 | Marine butt-welded flange |
| CN107717250A (en) * | 2017-10-10 | 2018-02-23 | 固安县惠民塑料滤业有限公司 | A kind of connection method for Johnson's pipe being used in backwash filter |
| CN107717250B (en) * | 2017-10-10 | 2020-02-14 | 固安县惠民塑料滤业有限公司 | Connecting method for Johnson pipe in backwashing filter |
| CN111230417A (en) * | 2020-02-25 | 2020-06-05 | 湖北理工学院 | Welding process for nodular cast iron pipe flange pipe |
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Application publication date: 20130116 |