CN100450688C - Thin-wall stainless steel double-layer and carbon steel base layer composite tube girth weld welding method - Google Patents

Thin-wall stainless steel double-layer and carbon steel base layer composite tube girth weld welding method Download PDF

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Publication number
CN100450688C
CN100450688C CNB2007101182721A CN200710118272A CN100450688C CN 100450688 C CN100450688 C CN 100450688C CN B2007101182721 A CNB2007101182721 A CN B2007101182721A CN 200710118272 A CN200710118272 A CN 200710118272A CN 100450688 C CN100450688 C CN 100450688C
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China
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welding
stainless steel
layer
multiple
groove
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CNB2007101182721A
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Chinese (zh)
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CN101100013A (en
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李为卫
陈志昕
罗金恒
赵新伟
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中国石油天然气集团公司
中国石油天然气集团公司管材研究所
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Abstract

The process of ring welding composite pipe comprising one thin stainless steel layer and one carbon steel base layer includes the following steps: 1. chamfering and eliminating oil stain; 2. bead welding and trimming chamfer; 3. pairing bimetal composite pipe chamfers; 4. argon shielded tungsten arc welding in the bottom; 5. welding the second layer to weld the base layers of two composite pipes; and 6. filling welding and finishing welding. During the welding process, stainless steel electrode and 309 or 309Mo welding material are adopted for reaching high strength and high toughness of the weld seam, and the chamfers have increased effective thickness of stainless steel layer for high welding quality and high corrosion resistance.

Description

The multiple tube welding method of girth weld of the multiple layer of thin-wall stainless steel and carbon steel base layer

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 relating to a kind of multiple layer is that thin-wall stainless steel and basic unit are the girth joint solder technology of 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: adopting machine-tooled method that the multiple tube ends of two multiple layers of thin-wall stainless steel of preparing welding and carbon steel base layer are processed angle is 30 °~35 ° groove 3, and groove 3 is 4~5 millimeters near the thickness of multiple layer 2 root face 4.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 groove 3 near 2~3 layers of the surface overlayings of the root faces 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; 30 °~35 ° of angles, the thickness of root face 4 is 0.4~0.5 millimeter.Clean groove with acetone behind the reconditioning groove.

(3) group is right: at the multiple tube internal argon-filling gas of the multiple layer of thin-wall stainless steel with carbon steel base layer, after treating that air is got rid of totally, two multiple layers of thin-wall stainless steel of preparing welding are right with 3 groups of the multiple tube grooves of carbon steel base layer, and spacing is 2~3 millimeters, adopts argon tungsten-arc welding to position welding.

(4) root backing welding: adopt the tungsten argon arc soldering method, in of multiple tube groove 3 welding of thin-wall stainless steel multiple layer in the state lower edge of tube interior argon-filled protection with carbon steel base layer.2~3 millimeters of the thickness of welding.

(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, and the multiple layer of multiple tube basic unit 1 with carbon steel base layer welds together with the thin-wall stainless steel of welding.

(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.

The purpose of doing like this, 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 and 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 deposited metal composition of described 309 type stainless steel welding materials is by weight percentage: C≤0.08; Si≤0.90; Mn 0.5-2.5; P≤0.04; S≤0.03; Cr22-25; Mo≤0.75; Ni 12-14; Cu≤0.75.

The deposited metal composition of described 309Mo type stainless steel welding material is by weight percentage: C≤0.08; 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, 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, welding material that Ni content is lower 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 and 309Mo welding material that present technique adopts have higher intensity and good plasticity and toughness than general carbon steel welding material, guarantee that weld seam has high intensity and excellent toughness, have corrected some personnel and have thought the wrong viewpoint that stainless steel welding material intensity is low.309 and 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.

Among the figure, 1. layer, 3. groove, 4. root face are 2. answered by basic unit.

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 the external diameter is the relative example that is welded as of multiple tube of the multiple layer of thin-wall stainless steel with the carbon steel base layer of 114 millimeters of φ, 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 ° 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 ER309MoL, and the trade mark is HOOCr24Ni13Mo2, and 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 treats 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.

(4) second layer welding

The same technology of employing and root backing welding is welded.

(5) 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 AO42.

Main welding parameters sees Table 1.

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.

Table 1 welding procedure major parameter

Claims (4)

1, the multiple tube welding method of girth weld of the multiple layer of a kind of thin-wall stainless steel and carbon steel base layer, the step of being taked is characterized in that:
(A) groove processing: adopting machine-tooled method that the multiple tube ends of two multiple layers of thin-wall stainless steel of preparing welding and carbon steel base layer are processed angle is 30 °~35 ° groove (3), groove (3) is 4~5 millimeters 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);
(B) soldering and sealing: at groove (3) near 2~3 layers of root face (4) surface overlayings 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 309Mo type stainless steel gas protection welding wire, postwelding adopts emery wheel reconditioning groove (3), 30 °~35 ° of angles, the thickness that reaches root face (4) is 0.4~0.5 millimeter, and groove (3) is cleaned with acetone in reconditioning groove (3) back;
(C) group is right: at the multiple tube internal argon-filling gas of the multiple layer of thin-wall stainless steel with carbon steel base layer, after treating that air is got rid of totally, two multiple layers of thin-wall stainless steel of preparing welding are right with multiple tube groove (3) group of carbon steel base layer, and spacing is 2~3 millimeters, adopts argon tungsten-arc welding to position welding;
(D) root backing welding: adopt the tungsten argon arc soldering method, at multiple tube groove (3) welding of thin-wall stainless steel multiple layer in the state lower edge of tube interior argon-filled protection with carbon steel base layer, 2~3 millimeters of the thickness of welding;
(E) second layer backing welding welding: on the top of root backing welding, the same technology of employing and step (D) root backing welding is carried out second layer welding, and the multiple layer of multiple tube basic unit (1) with carbon steel base layer welds together with the thin-wall stainless steel of welding;
(F) 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.
2, the multiple tube welding method of girth weld of the multiple layer of thin-wall stainless steel according to claim 1 and carbon steel base layer, it is characterized in that: all welding materials are 309 types or 309Mo type stainless steel welding material.
3, the multiple tube welding method of girth weld of the multiple layer of thin-wall stainless steel according to claim 2 and carbon steel base layer, it is characterized in that: described welding material is 309 type stainless steel welding materials, and the deposited metal composition of 309 type stainless steel welding materials is by weight percentage: C≤0.08; Si≤0.90; Mn 0.5-2.5; P≤0.04; S≤0.03; Cr22-25; Mo≤0.75; Ni12-14; Cu≤0.75.
4, the multiple tube welding method of girth weld of the multiple layer of thin-wall stainless steel according to claim 2 and carbon steel base layer, it is characterized in that: described welding material is 309 Mo type stainless steel welding materials, and the deposited metal composition of 309Mo type stainless steel welding material is by weight percentage: C≤0.08; Si≤0.90; Mn 0.5-2.5; P≤0.04; S≤0.03; Cr22-25; Mo2.0-3.0; Ni12-14; Cu≤0.75.
CNB2007101182721A 2007-07-04 2007-07-04 Thin-wall stainless steel double-layer and carbon steel base layer composite tube girth weld welding method CN100450688C (en)

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