CN101927390A - Method for welding circumferential weld between metal thin-wall clad layer and base layer of clad pipe - Google Patents

Method for welding circumferential weld between metal thin-wall clad layer and base layer of clad pipe Download PDF

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Publication number
CN101927390A
CN101927390A CN2009100536412A CN200910053641A CN101927390A CN 101927390 A CN101927390 A CN 101927390A CN 2009100536412 A CN2009100536412 A CN 2009100536412A CN 200910053641 A CN200910053641 A CN 200910053641A CN 101927390 A CN101927390 A CN 101927390A
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China
Prior art keywords
welding
groove
layer
weld
method
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CN2009100536412A
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Chinese (zh)
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刘荣春
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上海沪工电焊机制造有限公司
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Priority to CN2009100536412A priority Critical patent/CN101927390A/en
Publication of CN101927390A publication Critical patent/CN101927390A/en

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Abstract

The invention provides a method for welding circumferential weld between a metal thin-wall clad layer and a base layer of a clad pipe, which is used for welding circumferential weld of dual-metal clad steel pipes. The method is characterized by (A) groove processing: cleaning oil stains on the groove; (B) carrying out surfacing on the truncated edge, close to the clad layer, of the groove and coping the groove; (C) fitting up the groove of the dual-metal clad pipe; (D) root backing weld: adopting the gas tungsten arc welding method and carrying out welding along the groove of the dual-metal clad pipe under the state of argon-filled protection inside the pipe; (E) carrying out second layer welding on the root backing weld and welding the welding base layer of the dual-metal clad pipe; and (F) filled welding and cosmetic welding: wherein the welding materials are stainless steel electrodes. The method has the following effects: adopting 309 or 309Mo welding materials, thus ensuring the strength and good toughness of the weld; eliminating the gaps which probably exist between the clad layer and the base layer at the end of the groove; and increasing the effective thickness of the stainless steel layer at the groove root so that the quality of the welding joints are insensitive to misalignment, thus ensuring the corrosion resistance.

Description

The multiple tube welding method of girth weld of the multiple layer of metal thin-wall and basic unit

Technical field

The invention belongs to the Metal Material Welding technical field, relate to a kind of solder technology of bimetallic composite steel tube girth joint, particularly relate to the girth joint solder technology that a kind of metal thin-wall clad pipe and basic unit are the composite bimetal pipe of carbon steel.

Background technology

Basic unit is that carbon steel, multiple layer have solved industrial department Corrosion of Pipeline problems such as oil gas conveying, oil refining, chemical industry effectively for stainless composite bimetal pipe, has purposes more and more widely.The technical difficulty of welding composite bimetal pipe at the scene is very big, and present solder technology mainly contains two kinds.One Chinese patent publication number is the patent application of CN 1354061A.Carry out the welding of the multiple layer of inwall earlier, carry out the welding of transition zone and basic unit then, welding material is all used stainless steel, and the defective of this technology has 3 points: when (1) multiple layer thickness approached (less than 2 millimeters), the ground floor welding is easy to generate burnt defective; When (2) welding again layer, because thermal contraction, multiple layer may be separated the formation slit with basic unit, and the transition welding is easy to generate defective; (3) air, water or the foul that may exist between multiple layer and the basic unit in the tubulation process may cause gas hole defect in weld seam when transition zone welds.Its two Chinese patents Granted publication number is the patent of CN1267234C.Weld seam is divided into transition zone weld seam and basic unit's weld seam, be welded for twice, the compound layer of no independent stainless steel weld seam, the welding material of transition weld seam adopts stainless steel material, the welding rod of mild steel basic unit weld seam adopts mild steel arc welding electrode, the major defect of this technology has 2 points: during the welding of (1) ground floor transition zone, air, water or the foul that may exist between multiple layer and the basic unit in the tubulation process is possible cause gas hole defect in the transition zone welding, thereby causes the serious decline of the corrosion resisting property of weld seam; When (2) carrying out the welding of second layer weld seam, adopt the welding material of carbon steel composition to weld on the transition zone welding bead of stainless steel composition, Cr, Ni alloying element increase in this weld seam, form the martensitic structure of hardening easily, influence plasticity, the toughness of joint, also may produce cold crack when serious.These two kinds of technology also have a common defective to be exactly, and when weld seam produced misalignment, joint weld seam anticorrosion layer effective thickness reduced, and the corrosion resisting property of welding point is reduced.

Some document is also reported and is carried out a kind of technology of soldering and sealing, its way is to dig a sulculus (also can not grooving directly weld) on the carbon steel base layer of groove end near multiple layer, with welding method sulculus is filled up and to carry out soldering and sealing, but, when if the thickness of layer is less than 2 millimeters again, burn because multiple layer poor thermal conductivity is easy to generate, therefore, the inapplicable multiple layer thickness of this method welds less than 2 millimeters multiple tube.And its soldering and sealing adopts and the congruent stainless steel welding material of multiple layer, and because of alloying element content is low, the soldering and sealing weld seam is easy to generate a certain amount of martensite harmful structure that hardens after by basic unit's carbon steel dilution, also may crack defective when serious.

Summary of the invention

The multiple tube welding method of girth weld that the purpose of this invention is to provide the multiple layer of a kind of thin-wall stainless steel and carbon steel base layer, solve the composite bimetal pipe girth joint solder technology difficult problem of stainless steel double layer and carbon steel base layer, overcome existing solder technology and be not suitable for multiple layer thickness and weld less than 2 millimeters multiple tube; Adopt and the congruent stainless steel welding material of multiple layer, cause the soldering and sealing weld seam to be produced a certain amount of martensite harmful structure that hardens, the deficiency that cracks by basic unit carbon steel dilution back.

Realize that the technical scheme that the object of the invention is taked is:

(1) groove processing: adopt machine-tooled method that two composite bimetal pipe ends of preparing welding are processed the outer groove 3 that angle is the 30-35 degree, groove 3 is the 4-5 millimeter near the thickness of the root face 4 of multiple layer 2.With the rusty stain near the carbon steel grinder buffing groove 3, adopt the greasy dirt on the acetone cleaning groove 3.

(2) soldering and sealing: at the surface overlaying layer 2-3 of groove 3 near the root face 4 of multiple layer 2; the method of built-up welding is argon tungsten-arc welding; the material that built-up welding is used is 309 types or the stainless welding wire for gas shielded welding of 309Mo type; postwelding adopts emery wheel reconditioning groove; angle 30~35 degree, the thickness of root face 4 is the 0.4-0.5 millimeter.Clean groove with acetone behind the reconditioning groove.

(3) group is right: at the sub-internal argon-filling gas of composite bimetal pipe, treat air get rid of clean after, two 3 groups of composite bimetal pipe grooves preparing welding are right, 2~3 millimeters of spacings adopt argon tungsten-arc welding to position welding.

(4) root bottoming: adopt the tungsten argon arc soldering method, in compound groove 3 welding of the state lower edge of tube interior argon-filled protection bimetallic.The thickness of welding is 2-3mm.

(5) second layer backing welding welding: on the top of root backing welding, the same technology of employing and step (2) root backing welding is carried out second layer welding, the bimetallic of welding is managed basic unit 1 again weld together.

(6) fill weldering and cosmetic welding: adopt the manual arc soldering method to fill welding and cover welding on second layer backing welding top, welding material is a stainless steel electrode,

Such purpose, the one, eliminate the slit that may exist between multiple layer in groove end and the basic unit, be difficult for producing weld defect when making the butt weld welding; The 2nd, the effective thickness of increase end stainless steel layer, root pass becomes the welding of steel of the same race when making butt welding, and makes quality of weld joint insensitive to misalignment, even produce misalignment, also can guarantee certain corrosion resistance.

The described welding of carrying out two composite bimetal pipes, all welding beads all adopt 309 or 309Mo stainless steel welding material welding.Because welding material has higher Cr and Ni content, weld seam has than the better corrosion resistance of the multiple layer of liner, the possibility that produces hardened structure and produce cold crack at the transition zone welding bead when also avoiding adopting the welding of carbon steel welding material.309 or the 309Mo welding material have than higher intensity of general carbon steel welding material and good plasticity and toughness, guarantee that weld seam has high intensity and good plasticity and toughness

The chemical composition of described 309 type stainless steel welding materials by proportion percentage is: C ,≤0.08; Si ,≤0.90; Mn, 0.5-2.5; P ,≤0.04; S ,≤0.03; Cr, 22-25; Mo ,≤0.75; Ni, 12-14; Cu ,≤0.75.

The chemical composition of described 3090 type stainless steel welding materials is C by proportion percentage ,≤O.08; Si ,≤0.90; Mn, 0.5-2.5; P ,≤0.04; S ,≤0.03; Cr, 22-25; Mo, 2.0-3.0; Ni, 12-14; Cu ,≤0.75.

Effective effect of the present invention is: the welding material of employing has higher Cr and Ni content, high intensity and good plasticity and toughness, weld seam has than the better corrosion resistance of the multiple layer of liner, avoid adopting Cr and the lower welding material of Ni content on the soldering and sealing weld seam, to produce the martensitic structure phenomenon, also avoid the possibility that adopts carbon steel welding material welding transition layer welding bead to produce hardened structure and produce cold crack.309 or 309Mo welding material of the color usefulness of present technique have higher intensity and good plasticity and toughness than general carbon steel welding material, guarantee that weld seam has high intensity and good plasticity and toughness, corrected some personnel and thought the wrong viewpoint that stainless steel welding material intensity is low.309 or the tensile strength 〉=520MPa of 309Mo welding rod, the tensile strength 〉=420MPa of J427 welding rod, the tensile strength 〉=490MPa of J507 welding rod.

Eliminate the slit that may exist between multiple layer in groove end and the basic unit, can not produce weld defect when making the butt weld welding; Form certain thickness stainless steel layer at the groove root, increase the effective thickness of end stainless steel layer, root pass becomes the welding of steel of the same race when making butt welding, and makes quality of weld joint insensitive to misalignment, even produce a spot of misalignment, also can guarantee certain corrosion resistance.

Description of drawings

Fig. 1 is the multiple tube one end generalized section after the present invention finishes groove processing;

Fig. 2 is that the present invention finishes the multiple tube one end generalized section before the reconditioning groove after the soldering and sealing;

Fig. 3 be soldering and sealing weld seam of the present invention process or grinding process after generalized section;

Fig. 4 is the structural profile schematic diagram before the multiple tube solder side of the present invention welding;

Fig. 5 is the perspective view after multiple tube of the present invention is finished welding.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Embodiment 1: consult accompanying drawing 1.With external diameter is that 114 millimeters composite bimetal pipe is welded as example relatively, describes.Carbon steel base layer thickness is 12 millimeters, and the stainless steel double layer thickness is 1.5 millimeters.

(1) groove processing: adopting machine-tooled method is 30 degree at the pipe end machining angle, the groove that root face is 5 millimeters.With the rusty stain near the carbon steel grinder buffing groove, acetone cleans up the greasy dirt on the groove.

(2) soldering and sealing: near inner surface built-up welding backing run layer 2-3 stainless steel, welding method is argon tungsten-arc welding on groove, adopts 309Mo type austenitic stainless steel welding wire, and model is ER309MoI., the trade mark is HOOCr24Ni13M02, diameter is 2 millimeters.Postwelding adopts emery wheel reconditioning groove, angle 30~35 degree, 0.5 millimeter of root face.Acetone cleans up groove.

(3) group is right: the tube interior applying argon gas, treat that air gets rid of the tack welding of carrying out two multiple tubes after clean, and the groove group is to 2~3 millimeters in gap, and welding method, welding material are identical with soldering and sealing.

(4) root backing welding: adopt the tungsten argon arc soldering method, weld under the state of tube interior argon-filled protection, welding method, welding material are identical with soldering and sealing.

(5) second layer welding, the same technology of employing and root backing welding is welded.

(6) fill weldering and cosmetic welding: adopt the manual arc soldering method to weld, welding material adopts 309Mo type stainless steel electrode, and model is E309MoL, and the trade mark is A042.

Main welding parameters sees Table 1

Table 1 welding procedure major parameter

The quality of the welding piece of being undertaken by this technology is estimated according to SY/T 4103-1995 " steel pipe welding and check and accept " standard, the x-ray inspection result is qualified, mechanical property test results such as stretching, impact, bending, cutting hammer break are qualified, the Huey test result is qualified, and the metallographic structure check does not find that martensitic structure exists.

More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.

Claims (5)

1. the multiple tube welding method of girth weld of the multiple layer of metal thin-wall and basic unit is characterized in that, comprises that groove processes and soldering and sealing.
2. the multiple tube welding method of girth weld of the multiple layer of metal thin-wall as claimed in claim 1 and basic unit, it is characterized in that, groove processing adopts machine-tooled method that the two metal tube ends that will weld are processed angled groove, with the greasy dirt on groove polishing and the cleaning groove.
3. the multiple tube welding method of girth weld of the multiple layer of metal thin-wall as claimed in claim 1 and basic unit is characterized in that, adopts argon tungsten-arc welding with the keep to the side root face surface overlaying layer 2-3 of nearly multiple layer of groove, the also cleaning of postwelding polishing slope product.
4. the multiple tube welding method of girth weld of the multiple layer of metal thin-wall as claimed in claim 1 and basic unit is characterized in that applying argon gas comes the emptying air in pipe, and two metal composite pipes of preparing to weld are welded along groove, and its thickness is 2-3min.
5. the multiple tube welding method of girth weld of the multiple layer of metal thin-wall as claimed in claim 1 and basic unit, it is characterized in that, on the top of root backing welding, adopt the technology identical to carry out second layer welding with the root backing welding, the metal composite pipe that welds is welded together.Adopt the method for manual electric arc welding to fill welding and cover welding on second layer backing welding top again.
CN2009100536412A 2009-06-23 2009-06-23 Method for welding circumferential weld between metal thin-wall clad layer and base layer of clad pipe CN101927390A (en)

Priority Applications (1)

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CN2009100536412A CN101927390A (en) 2009-06-23 2009-06-23 Method for welding circumferential weld between metal thin-wall clad layer and base layer of clad pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009100536412A CN101927390A (en) 2009-06-23 2009-06-23 Method for welding circumferential weld between metal thin-wall clad layer and base layer of clad pipe

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102528244A (en) * 2012-02-14 2012-07-04 中国海洋石油总公司 Semiautomatic argon tungsten-arc welding technological process of bimetal compounding sea pipe
CN103056515A (en) * 2012-12-26 2013-04-24 北京康华盛鸿能源科技发展有限公司 Welding process for transporting alpha type aluminum oxide ceramic lining by oil and gas pipeline
CN103586566A (en) * 2013-10-23 2014-02-19 中国石油天然气集团公司 Semi-automatic argon-arc welding method for bimetal composite pipes
CN103639572A (en) * 2013-11-21 2014-03-19 内蒙古伊泰煤制油有限责任公司 Compound pipeline weld joint repair method for media rich in hydrogen
CN103737187A (en) * 2014-02-11 2014-04-23 芜湖鑫力管道技术有限公司 Direct connection welding mounting process for stainless steel-lined composite pipes
CN104339123A (en) * 2013-07-31 2015-02-11 中国石油天然气集团公司 Bimetal composite pipe welding method
CN104607773A (en) * 2014-12-11 2015-05-13 云南昆钢新型复合材料开发有限公司 Tubulation welding method of stainless steel outer composite tube
CN104625341A (en) * 2014-12-06 2015-05-20 常熟市东鑫钢管有限公司 Composite stainless steel pipe circumferential-weld welding process
CN107803607A (en) * 2016-09-09 2018-03-16 中国石化工程建设有限公司 Welding dissimilar materials structure for composite plate pressing pressure container
CN108213653A (en) * 2017-12-26 2018-06-29 重庆安特管业有限公司 A kind of method for welding pipeline
CN108608096A (en) * 2018-05-17 2018-10-02 四川石油天然气建设工程有限责任公司 A kind of welding procedure method of oil and gas transmission mechanical composite tube
CN108723627A (en) * 2018-05-21 2018-11-02 武汉钢铁有限公司 A kind of tensile strength >=810MPa bridge steel craft complex welding methods

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102528244B (en) * 2012-02-14 2013-09-18 中国海洋石油总公司 Semiautomatic argon tungsten-arc welding technological process of bimetal compounding sea pipe
CN102528244A (en) * 2012-02-14 2012-07-04 中国海洋石油总公司 Semiautomatic argon tungsten-arc welding technological process of bimetal compounding sea pipe
CN103056515B (en) * 2012-12-26 2015-09-16 天津恩帜科技有限公司 A kind of welding procedure ceramic-lined for oil and gas pipes conveying alpha-type aluminum oxide
CN103056515A (en) * 2012-12-26 2013-04-24 北京康华盛鸿能源科技发展有限公司 Welding process for transporting alpha type aluminum oxide ceramic lining by oil and gas pipeline
CN104339123A (en) * 2013-07-31 2015-02-11 中国石油天然气集团公司 Bimetal composite pipe welding method
CN103586566A (en) * 2013-10-23 2014-02-19 中国石油天然气集团公司 Semi-automatic argon-arc welding method for bimetal composite pipes
CN103586566B (en) * 2013-10-23 2015-11-18 中国石油天然气集团公司 The semi-automatic argon arc welding method of composite bimetal pipe
CN103639572A (en) * 2013-11-21 2014-03-19 内蒙古伊泰煤制油有限责任公司 Compound pipeline weld joint repair method for media rich in hydrogen
CN103639572B (en) * 2013-11-21 2015-06-03 内蒙古伊泰煤制油有限责任公司 Compound pipeline weld joint repair method for media rich in hydrogen
CN103737187A (en) * 2014-02-11 2014-04-23 芜湖鑫力管道技术有限公司 Direct connection welding mounting process for stainless steel-lined composite pipes
CN104625341A (en) * 2014-12-06 2015-05-20 常熟市东鑫钢管有限公司 Composite stainless steel pipe circumferential-weld welding process
CN104607773A (en) * 2014-12-11 2015-05-13 云南昆钢新型复合材料开发有限公司 Tubulation welding method of stainless steel outer composite tube
CN107803607A (en) * 2016-09-09 2018-03-16 中国石化工程建设有限公司 Welding dissimilar materials structure for composite plate pressing pressure container
CN107803607B (en) * 2016-09-09 2019-08-20 中国石化工程建设有限公司 Dissimilar material welding structure for composite plate pressing pressure container
CN108213653A (en) * 2017-12-26 2018-06-29 重庆安特管业有限公司 A kind of method for welding pipeline
CN108608096A (en) * 2018-05-17 2018-10-02 四川石油天然气建设工程有限责任公司 A kind of welding procedure method of oil and gas transmission mechanical composite tube
CN108723627A (en) * 2018-05-21 2018-11-02 武汉钢铁有限公司 A kind of tensile strength >=810MPa bridge steel craft complex welding methods

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Application publication date: 20101229