CN104801826B - The process of composite bimetal pipe two-sided welding - Google Patents

The process of composite bimetal pipe two-sided welding Download PDF

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Publication number
CN104801826B
CN104801826B CN201510129232.1A CN201510129232A CN104801826B CN 104801826 B CN104801826 B CN 104801826B CN 201510129232 A CN201510129232 A CN 201510129232A CN 104801826 B CN104801826 B CN 104801826B
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welding
groove
liner
arc
argon
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CN104801826A (en
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牛勇
温志刚
田雷
韦生
靳伟亮
蔡新荣
吕志军
王体刚
陆传航
陈哲
费东
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China National Offshore Oil Corp CNOOC
Offshore Oil Engineering Co Ltd
Offshore Oil Engineering Qingdao Co Ltd
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China National Offshore Oil Corp CNOOC
Offshore Oil Engineering Co Ltd
Offshore Oil Engineering Qingdao Co Ltd
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Abstract

The present invention provides a kind of process of composite bimetal pipe two-sided welding, including:(1) welding preparation process;(2) plain steel back cover welding sequence;(3) plain steel hot bead welding sequence;(4) plain steel filling and cover welding process;(5) the anti-corrosion polishing of inner liner groove and cleaning;(6) anti-corrosion inner liner built-up welding;Have the advantages that welding quality is high, labor intensity is small, construction cost is low and production efficiency is high, the operating mode that is particularly suitable for use in is severe, the welding of ocean engineering composite riser, LNG cold high-pressure corrosion-resistant pipeline, oil and gas pipeline, heating furnace pipe and the chemical industry pipe high to material requirements etc., and suitable for the welding of deep water compound pipeline complex pipeline and pressure vessel.

Description

The process of composite bimetal pipe two-sided welding
Technical field
The present invention relates to welding technique, more particularly to a kind of process of composite bimetal pipe two-sided welding.
Background technology
With going deep into for oil-gas field development, the corrosive environment that surface line faces is more and more severe, especially contains in some height H2S/CO2Oil gas field, surface line etching problem is extremely serious, and ordinary carbon steel is difficult to be competent at, and corrosion resistant alloy is again expensive, The appearance of composite bimetal pipe makes it have found effective solution.
Composite bimetal pipe purposes is quite extensive, is mainly used in offshore drilling platformses pipe arrangement, conveyance conduit, heating furnace With pipe, HTHP boiler tube, chemical industry pipe etc..
Welding is one of key technology of composite bimetal pipe manufacture and application.For the spreading weldering of composite bimetal pipe Connect, the welding procedure of main flow is one side Welding both at home and abroad at present, and such a mode requires that the basic unit of multiple tube and inner liner are both needed to Using high alloy wlding, process is simple but welding efficiency is low, high cost, therefore has much room for improvement.
The content of the invention
It is a primary object of the present invention to overcome the disadvantages mentioned above that existing process is present, and provide a kind of composite bimetal pipe The process of welding, it uses two-sided compound bevel, and mother metal/wlding matching connection reduces welding cost, improves welding effect Rate, it is ensured that welding quality.
The present invention is to solve its technical problem by the following technical programs:
The process of composite bimetal pipe two-sided welding of the present invention, it is characterised in that including step:
(1) welding preparation process:
(1) groove makes:Process two-sided compound bevel;
(2) groove group pair:Check retaining wall on slope quality, it is ensured that groove group is carried out after the integrity of groove and its enclosure region Right, groove group is 3mm to 5mm to gap;
(3) corrosion resistance processing is carried out to groove liner surface;
(4) wlding selection and cleaning;
(5) composite bimetal pipe to be welded is preheated;
(2) plain steel back cover welding sequence:Argon-are welding technology, using individual layer single-run welding by multiple tube carbon steel side Carry out back cover welding;Two welders stand on the both sides of multiple tube respectively during welding, and 1 people is by 6 o'clock position welded clockwise to 12 O'clock position, another people is soldered to 12 o'clock position counterclockwise by 6 o'clock position;
(3) plain steel hot bead welding sequence:Argon-are welding technology, using individual layer single-run welding, two welders symmetrically apply Weldering;
(4) plain steel filling and cover welding process:
Fill welding procedure from argon tungsten-arc welding filling welding, semi-automatic carbon dioxide gas shielded arc welding filling welding or Person's machinery submerged-arc welding filling welding;
Cover welding process selection semi-automatic carbon dioxide gas shielded arc welding cover welding or mechanical submerged-arc welding capping weldering Connect;
Wherein, the filling of semi-automatic carbon dioxide gas shielded arc welding and capping, all positon is selected according to standard AWS D1.1 (6G positions) is welded;Mechanical submerged-arc welding completes filling or cosmetic welding according to standard AWS D1.1 from downhand position (1G positions) Connect;
(5) the anti-corrosion polishing of inner liner groove and cleaning:
Backing run root reinforcement is polished flat;It will be cleaned out in the range of at least 25mm of weld seam and its both sides;It is anti-corrosion Before internal layer built-up welding, welding wire, welding groove and both sides at least 25mm scopes inner region are cleaned with absolute ethyl alcohol;To contact weld The object in region is cleaned with absolute ethyl alcohol;
(6) anti-corrosion inner liner built-up welding:
Inner liner built-up welding is carried out using shielded metal arc welding process, at least ensures two layers of four road built-up welding.
The process of foregoing composite bimetal pipe two-sided welding, it is characterised in that the composite bimetal pipe matrix Material is the low temperature carbon steel that tensile strength is not less than 450MPa, and anti-corrosion inner liner material is Ni-based 625 alloy, matrix and inner liner Between metallurgical binding;Plain steel wlding selects AWS A5.18 argon-arc welding wires+AWS A5.17 welding wire for submerged-arc welding or AWS A5.18 Argon-arc welding wire+AWS A5.29 carbon dioxide gas arc welding welding wires, inner liner wlding welds for AWS A5.11E NiCrMo-3 Material.
The process of foregoing composite bimetal pipe two-sided welding, it is characterised in that in the step (1), groove is adopted Two-sided compound bevel is used, the structure of the two-sided compound bevel includes the outer groove and internal groove two parts that are integrally connected, the outer slope Mouth is located at matrix side;And outer groove is that side is 37.5 ± 2.5 degree of bottom groove gradient, top groove gradient 10 ± 2.5 Degree, opposite side gradient is at least 30 ± 2.5 degree of single V compound bevels, single V compound bevels root face 2 to 3mm, groove gap 3 To 5mm, the outer side lower part groove of groove one is flex point, the vertical range of the flex point to internal groove top surface with top groove junction At least 20mm;The internal groove is that gradient is 45 ± 5 degree of trapezoidal groove, the distance 4 of the internal groove top surface to inner liner to It is 2mm less, and the unilateral groove length 11 of internal groove top surface is at least 6mm;Groove is made using machining or machining+polishing Method;
It is described to carry out corrosion resistance to groove liner surface to handle being to groove liner surface with copper/saturated copper sulphate solution Perform etching, to confirm the Ni-based residual for removing carbon steel surface completely;
The wlding selection and cleaning, are to select corresponding wlding according to mother metal/wlding matching principle is one-to-one, and according to weldering The two kinds of welding procedures of different choice for connecing operating mode carry out mechanical submerged-arc welding and semi-automatic carbon dioxide gas to multiple tube carbon steel base layer The wlding type selecting of body protection weldering;
Plain steel wlding selects TG-S50 argon arc welding back covers;From TG-S50 argon arc weldings, DW-A55L SR semi-automatic two Carbon oxide gas protection weldering or LA-71 submerged-arc weldings filling, wherein submerged arc flux are 880M;From DW-A55L SR semi-automatic two Carbon oxide gas protection weldering or LA-71 submerged-arc welding cappings, wherein submerged arc flux are 880M;Inner liner wlding is INCONEL WE112 welding rods;After wlding is ready, cleaned before welding with ethanol solution;
It is described to be to composite bimetal pipe preheating to be welded, according to standard ASME B31.3 requirements, according to compound tube wall Thickness carries out weld preheating.
The process of foregoing composite bimetal pipe two-sided welding, it is characterised in that the carbon steel base of the step (2) Body back cover welding sequence, when carrying out back cover welding to multiple tube carbon steel using argon arc welding technique, two welders stand on multiple respectively The both sides of pipe are closed, 1 people is by 6 o'clock position welded clockwise to 12 o'clock position, and another people is soldered to counterclockwise by 6 o'clock position 12 o'clock position.
The process of foregoing composite bimetal pipe two-sided welding, it is characterised in that the step (5) it is anti-corrosion in Lining groove is polished and cleaned, it is necessary to will using the used aluminum oxide not on carbon steel or low alloy steel/silicon carbide grinding wheel piece Backing run root reinforcement polishes flat;It will be cleaned out using stainless steel steel brush in the range of weld seam and its both sides at least 25mm, To prevent adverse effect that paint, grease, iron rust, dirt and other materials are caused to weld seam.
The process of foregoing composite bimetal pipe two-sided welding, it is characterised in that the carbon steel base of the step (2) In body back cover welding sequence, back cover welding parameter setting is that tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, 18~22L/Min of flow, 110~160A of welding current, 11~14V of weldingvoltage, 95~110mm/ of speed of welding Min, maximum heat input 1.2KJ/mm;
In the plain steel hot bead welding sequence of the step (3), hot bead welding parameter is set as that tungsten electrode type is Containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, 18~22L/Min of flow, 170~220A of welding current, weldingvoltage 11~14V, speed of welding 160~190mm/min, maximum heat input 1.1KJ/mm;
In the plain steel filling of the step (4) and cover welding process, filling welding parameter setting:Tungsten argon arc Weldering filling welding parameter is that tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, 18~22L/Min of flow, 170~230A of welding current, 11~14V of weldingvoltage, speed of welding 170~190mm/min, maximum heat input 1.1KJ/mm; Semi-automatic carbon dioxide gas shielded arc welding filling welding parameter is 160~210A of welding current, 160~300mm/ of speed of welding Min, control heat input is not more than 1.7KJ/mm, and welding protection gas is 20%CO2+ 80%Ar gaseous mixtures, gas flow 15~ 25L/Min;Mechanical submerged-arc welding filling welding parameter is 240~500A of welding current, 400~600mm/Min of speed of welding, control Heat input is not more than 2.2KJ/mm;Cover welding parameter setting:Semi-automatic carbon dioxide gas shielded arc welding cover welding parameter For 150~180A of welding current, 160~200mm/Min of speed of welding, control heat input is not more than 1.5KJ/mm, and welding is protected Shield gas is 20%CO2+ 80%Ar gaseous mixtures, 15~25L/Min of gas flow;Mechanical submerged-arc welding capping welding parameter is welding electricity 250~470A, 420~600mm/Min of speed of welding are flowed, control heat input is not more than 2.1KJ/mm;
In the anti-corrosion inner liner built-up welding process of the step (6), the parameter setting of shielded metal arc welding process is welding current 60~95A, 85~120mm/Min of speed of welding, control heat input are not more than 1.6KJ/mm, and at least ensure two layers of four road heaps Weldering.
The beneficial effect of the process of composite bimetal pipe two-sided welding of the present invention is, using two-sided compound bevel, real The one-to-one Optimum Matching connection of existing multiple tube mother metal/wlding, solves the problems, such as the efficient welding of composite bimetal pipe, fill up with Ni-based 625 alloy is the blank in the multiple tube two-sided welding field of inner liner.The process can reduce welding cost and work The construction intensity of people, while welding quality is improved, welding efficiency is greatly improved, and shortens construction period.By two-sided multiple Conjunction groove design realizes composite bimetal pipe matrix/Optimum Matching between inner liner and wlding and connected, and reduces high alloy The filling proportion of wlding, wlding cost is greatly reduced.
Brief description of the drawings
Fig. 1 is groove schematic diagram of the invention.
Major Symbol explanation in figure:1 it is the outer upper lateral part groove gradient of groove one, 2 is that the outer side lower part groove of groove one inclines Gradient, 3 be outer groove inclination angle flex point to internal groove top surface vertical range, 4 be in internal groove top surface is to inner liner distance, 5 Groove gradient, 6 be outer groove opposite side gradient, 7 be plain steel, 8 be root face, 9 be anti-corrosion inner liner, 10 be slope Mouth gap, 11 are the unilateral length of internal groove top surface.
Embodiment
The process of composite bimetal pipe two-sided welding of the present invention is, using the design of two-sided compound bevel, to realize multiple tube Matrix/one-to-one Optimum Matching between inner liner and wlding is connected.The composite bimetal pipe basic material is carbon steel, anti-corrosion interior Lining material is UNS N06625 nickel-base alloys.
Embodiment 1:
Specification Φ 914.4mm × 68mm of composite bimetal pipe, its basic material is the ASTM A671CC65 of ASTM standard Carbon steel, anti-corrosion inner liner is UNS N06625 nickel-base alloys, inner liner thickness 3mm.Main operational steps are as follows:
1st, welding preparation process:
1) groove makes:Two-sided compound bevel is processed using the method for machining+polishing, two-sided compound bevel structure is as schemed Shown in 1.Positioned at the outer groove side of the side of plain steel 7 be bottom groove gradient 2 be 35 degree, top groove gradient 1 be 10 Degree, opposite side gradient 6 is 30 degree of single V compound bevels, and single V compound bevels root face 8 is 2mm, and groove gap 10 is 3mm, The outer side lower part groove of groove one is flex point with top groove junction, and the vertical range 3 of the flex point to internal groove top surface is 20mm;Internal groove is that gradient 5 is 45 degree of trapezoidal groove, and the distance 4 of internal groove top surface to inner liner 9 is 2mm, and internal groove Top surface one side length 11 is 6mm.
2) groove group pair:Check retaining wall on slope quality, it is ensured that the integrity and assembling precision of groove and its near zone, group It is 3mm to gap 10.
3) Ni-based inner liner groove copper/saturated copper sulphate etching:It is molten to inner liner groove face progress copper/saturated copper sulphate before welding Liquid is etched.
4) wlding selection and cleaning:According to the one-to-one selection welding material of mother metal/wlding matching principle, plain steel wlding From TG-S50 argon arc welding back covers, LA-71 submerged-arc weldings filling, capping, wherein solder flux are 880M;Ni-based inner liner wlding is INCONEL WE112 welding rods.After wlding is ready, cleaned before welding with ethanol solution.
5) composite bimetal pipe is preheated:79 DEG C of weld preheating is carried out before weldering with Resistance Heating Film.
2nd, plain steel back cover welding sequence:
Back cover welding sequence uses individual layer single-run welding.
Using argon tungsten-arc welding process, wlding is TG-S50, and gage of wire is 2.4mm.
Two welders stand on the both sides of weld seam respectively, 1 people by 6 o'clock position welded clockwise to 12 o'clock position, it is another People is soldered to 12 o'clock position counterclockwise by 6 o'clock position, completes back cover welding.
Welding parameter is set:Tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, flow 20L/Min, Welding current 159A, weldingvoltage 12V, speed of welding 95mm/min, maximum heat input 1.2KJ/mm.
3rd, plain steel hot bead welding sequence:
Hot weld procedure uses individual layer single-run welding.
Using argon tungsten-arc welding process, two welders are symmetrically welded.
Welding parameter is set:Tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, flow 20L/Min, Welding current 220A, weldingvoltage 12V, speed of welding 165mm/min, maximum heat input 1.1KJ/mm.
4th, plain steel filling welding sequence:
Filling welder's sequence uses multi-pass welding.
Using mechanical welding technique of submerged arc welding, welding wire LA-71, solder flux 880M, gage of wire Φ 2.4mm and Φ 4.0mm two Kind.
Welding condition:(1)LA-71(Φ2.4mm)/880M:Welding current 350A, speed of welding 400mm/Min, control Heat input quantity no more than 2.2KJ/mm.(2)LA-71(Φ4.0mm)/880M:Welding current 465A, speed of welding 462mm/ Min, control heat input is not more than 2.2KJ/mm.
5th, plain steel cover welding process:
Cosmetic welding process uses multi-pass welding.
Using mechanical welding technique of submerged arc welding.Welding wire LA-71, solder flux 880M, gage of wire Φ 2.4mm and Φ 4.0mm two Kind.
Welding condition:(1)LA-71(Φ2.4mm)/880M:Welding current 390A, speed of welding 436mm/Min, control Heat input quantity no more than 2.1KJ/mm.(2)LA-71(Φ4.0mm)/880M:Welding current 460A, speed of welding 479mm/ Min, control heat input is not more than 2.1KJ/mm.
6th, the anti-corrosion polishing of inner liner groove and cleaning:
Using used aluminum oxide/silicon carbide grinding wheel piece not on carbon steel or low alloy steel by backing run root reinforcement Polish flat, will be cleaned out using polishing or stainless steel steel brush in the range of weld seam and weld seam both sides at least 25mm, prevent oil The adverse effect that paint, grease, iron rust, dirt and other materials are caused to weld seam.
Before built-up welding, welding wire, welding groove and groove both sides at least 25mm scopes inner region must be wiped with absolute ethyl alcohol Wash.In addition, every object for being likely to contact welding region also must all be cleaned with absolute ethyl alcohol.
7th, Ni-based inner liner built-up welding:
Inner liner built-up welding is carried out using manual electric arc welding.Welding rod:INCONEL WE112, core diameter:Φ3.2mm.
Welding parameter:Welding current 75A, speed of welding 85mm/Min, control heat input are not more than 1.6KJ/mm, weld 4 layer of 11 road.
Embodiment 2:
Specification Φ 965.2mm × 70mm of composite bimetal pipe, wherein basic material are using iso standard ISO3183L450 carbon steels, anti-corrosion inner liner is UNS N06625 nickel-base alloys, and anti-corrosion inner liner thickness is 4mm.Operating procedure is such as Under:
1st, welding preparation process:
1) groove makes:Two-sided compound bevel is processed using the method for machining+polishing, two-sided compound bevel structure is as schemed Shown in 1.Positioned at the outer groove side of the side of plain steel 7 be bottom groove gradient 2 be 40 degree, top groove gradient 1 be 12.5 degree, opposite side gradient 6 is 32.5 degree of single V compound bevels, and single V compound bevels root face 8 is 3mm, groove gap 10 For 4mm, the outer side lower part groove of groove one is flex point, the vertical range of the flex point to internal groove top surface with top groove junction 3 be 20mm;Internal groove is that gradient 5 is 45 degree of trapezoidal groove, and the distance 4 of internal groove top surface to inner liner 9 is 3mm, and interior Groove top surface one side length 11 is 6mm.
2) groove group pair:Check retaining wall on slope quality, it is ensured that the integrity and assembling precision of groove and its near zone, group It is 4mm to gap.
3) Ni-based inner liner groove copper/saturated copper sulphate etching:It is molten to inner liner groove face progress copper/saturated copper sulphate before welding Liquid is etched.
4) wlding selection and cleaning:According to the one-to-one selection welding material of mother metal/wlding matching principle, plain steel wlding From TG-S50 argon arc welding back covers, LA-71 submerged-arc weldings filling, capping, wherein solder flux are 880M;Inner liner wlding is INCONEL WE112 welding rods.After wlding is ready, cleaned before welding with ethanol solution.
5) composite bimetal pipe is preheated:79 DEG C of weld preheating is carried out before weldering with Resistance Heating Film.
2nd, plain steel back cover welding sequence:
Back cover welding sequence uses individual layer single-run welding.
Using argon tungsten-arc welding process, wlding is TG-S50, and gage of wire is 2.4mm.
Two welders stand on the both sides of weld seam respectively, 1 people by 6 o'clock position welded clockwise to 12 o'clock position, it is another People is soldered to 12 o'clock position counterclockwise by 6 o'clock position, completes back cover welding.
Welding parameter is set:Tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, flow 21L/Min, Welding current 160A, weldingvoltage is 14V, speed of welding 95mm/min, maximum heat input 1.1KJ/mm.
3rd, plain steel hot bead welding sequence:
Hot weld procedure uses individual layer single-run welding.
Using argon tungsten-arc welding process, two welders are symmetrically welded.
Welding parameter is set:Tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, flow 22L/Min, Welding current 220A, weldingvoltage 11V, speed of welding 160mm/min, maximum heat input 1.1KJ/mm.
4th, plain steel filling welding sequence:
Filling welder's sequence uses multi-pass welding.
Using mechanical welding technique of submerged arc welding.Welding wire LA-71, solder flux 880M, gage of wire Φ 2.4mm and Φ 4.0mm two Kind.
Welding condition:1)LA-71(Φ2.4mm)/880M:Welding current 400A, speed of welding 409mm/Min, control Heat input quantity no more than 1.94KJ/mm.2)LA-71(Φ4.0mm)/880M:Welding current 450A, speed of welding 459mm/ Min, control heat input is not more than 2.0KJ/mm.
5th, plain steel cover welding process:
Cosmetic welding process uses multi-pass welding.
Using mechanical welding technique of submerged arc welding.Welding wire LA-71, solder flux 880M, gage of wire Φ 2.4mm and Φ 4.0mm two Kind.
Welding condition:1)LA-71(Φ2.4mm)/880M:Welding current 400A, speed of welding 420mm/Min, control Heat input quantity no more than 1.8KJ/mm.2)LA-71(Φ4.0mm)/880M:Welding current 450A, speed of welding 488mm/ Min, control heat input is not more than 1.9KJ/mm.
6th, the polishing of inner liner groove and cleaning:
Using used aluminum oxide/silicon carbide grinding wheel piece not on carbon steel or low alloy steel by backing run root reinforcement Polish flat, will be cleaned out using polishing or stainless steel steel brush in the range of weld seam and weld seam both sides at least 25mm, prevent oil The adverse effect that paint, grease, iron rust, dirt and other materials are caused to weld seam.
Before built-up welding, welding wire, welding groove and groove both sides at least 25mm scopes inner region must be wiped with absolute ethyl alcohol Wash.In addition, every object for being likely to contact welding region also must all be cleaned with absolute ethyl alcohol.
7th, Ni-based inner liner built-up welding:
Inner liner built-up welding is carried out using manual electric arc welding.Welding rod:INCONEL WE112, core diameter:Φ3.2mm.
Welding parameter:Welding current 80A, speed of welding 90mm/Min, control heat input are not more than 1.53KJ/mm, weld Connect 3 layer of 7 road.
Embodiment 3:
Specification Φ 1016mm × 75mm of composite bimetal pipe, wherein plain steel are the API 5L using API standard X65 carbon steels, anti-corrosion inner liner is UNS N06625 nickel-base alloys, and anti-corrosion inner liner thickness is 5mm;Operating procedure is as follows:
1st, welding preparation process:
1) groove makes:Two-sided compound bevel is processed using the method for machining+polishing, two-sided compound bevel structure is as schemed Shown in 1.Positioned at the outer groove side of the side of plain steel 7 be bottom groove gradient 2 be 40 degree, top groove gradient 1 be 12.5 degree, opposite side gradient 6 is 32.5 degree of single V compound bevels, and single V compound bevels root face 8 is 3mm, groove gap 10 For 5mm, the outer side lower part groove of groove one is flex point, the vertical range of the flex point to internal groove top surface with top groove junction 3 be 20mm;Internal groove is that gradient 5 is 45 degree of trapezoidal groove, and the distance 4 of internal groove top surface to inner liner 9 is 4mm, and interior Groove top surface one side length 11 is 6mm.
2) groove group pair:Check retaining wall on slope quality, it is ensured that the integrity and assembling precision of groove and its near zone, group It is 3mm to gap.
3) Ni-based inner liner groove copper/saturated copper sulphate etching:It is molten to inner liner groove face progress copper/saturated copper sulphate before welding Liquid is etched.
4) wlding selection and cleaning:According to the one-to-one selection welding material of mother metal/wlding matching principle, plain steel wlding From TG-S50 argon arc welding back covers, the filling of DW-A55L SR semi-automatic carbon dioxide gas shielded arc weldings, capping;Inner liner wlding is INCONEL WE112 welding rods.After wlding is ready, cleaned before welding with ethanol solution.
5) composite bimetal pipe is preheated:80 DEG C of weld preheating is carried out before weldering with Resistance Heating Film.
2nd, plain steel back cover welding sequence:
Back cover welding sequence uses individual layer single-run welding.
Using argon tungsten-arc welding process, wlding is TG-S50, and gage of wire is 2.4mm.
Two welders stand on the both sides of weld seam respectively, 1 people by 6 o'clock position welded clockwise to 12 o'clock position, it is another People is soldered to 12 o'clock position counterclockwise by 6 o'clock position, completes back cover welding.
Welding parameter is set:Tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, flow 20L/Min, Welding current 159A, weldingvoltage 12V, speed of welding 95mm/min, maximum heat input 1.2KJ/mm.
3rd, plain steel hot bead welding sequence:
Hot weld procedure uses individual layer single-run welding.
Using argon tungsten-arc welding process, two welders are symmetrically welded.
Welding parameter is set:Tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, flow 20L/Min, Welding current 220A, weldingvoltage is 12V, speed of welding 165mm/min, maximum heat input 1.1KJ/mm.
4th, plain steel filling welding sequence:
Filling welder's sequence uses multi-pass welding.
Using semi-automatic carbon dioxide gas shielded arc welding welding procedure.Welding wire DW-A55L SR, gage of wire Φ 1.2mm, Welding protection gas is 20%CO2+ 80%Ar gaseous mixtures.
Welding condition:20%CO2+ 80%Ar mixed gas flow 19L/Min, welding current 204A, speed of welding 192mm/Min, control heat input is not more than 1.7KJ/mm.
5th, plain steel cover welding process:
Cosmetic welding process uses multi-pass welding.
Using semi-automatic carbon dioxide gas shielded arc welding welding procedure.Welding wire DW-A55L SR, gage of wire Φ 1.2mm, Welding protection gas is 20%CO2+ 80%Ar gaseous mixtures.
Welding condition:20%CO2+ 80%Ar mixed gas flow 21L/Min, welding current 170A, speed of welding 182mm/Min, control heat input is not more than 1.5KJ/mm.
6th, the Ni-based polishing of inner liner groove and cleaning:
Using used aluminum oxide/silicon carbide grinding wheel piece not on carbon steel or low alloy steel by backing run root reinforcement Polish flat, will be cleaned out using polishing or stainless steel steel brush in the range of weld seam and weld seam both sides at least 25mm, prevent oil The adverse effect that paint, grease, iron rust, dirt and other materials are caused to weld seam.
Before built-up welding, welding wire, welding groove and groove both sides at least 25mm scopes inner region must be wiped with absolute ethyl alcohol Wash.In addition, every object for being likely to contact welding region also must all be cleaned with absolute ethyl alcohol.
7th, Ni-based inner liner built-up welding:
Inner liner built-up welding is carried out using manual electric arc welding.Welding rod:INCONEL WE112, core diameter:Φ3.2mm.
Welding parameter:Welding current 75A, speed of welding 85mm/Min, control heat input are not more than 1.6KJ/mm, weld 4 layer of 11 road.
The advantage of the process of composite bimetal pipe two-sided welding of the present invention:1st, designed by two-sided compound bevel, it is real Show the Optimum Matching of composite bimetal pipe plain steel, corrosion resistant alloy inner liner and wlding, reduce the application of high alloy wlding, Wlding cost is greatly reduced.The automation of plain steel welding is realized, welding efficiency is greatly improved, reduce labor intensity, shortened Construction period.3rd, by links such as the design of corrosion resistant alloy inner liner internal groove, thermal weld stress control and multi-pass weldings, realize The minimum of corrosion resistant alloy weld seam alloying element dilution, is effectively ensured the decay resistance of lining weld seam.4th, saturation sulfuric acid is passed through The links such as copper etching, washes of absolute alcohol, realize the cleaning operation of welding, welding quality are effectively ensured.5th, disliked suitable for operating mode It is bad, the ocean engineering composite riser high to material requirements, the anti-corrosion pipeline of liquefied natural gas (LNG) cryogenic high pressure, On The Oil And Gas Transportation pipe The welding of road, heating furnace pipe and chemical industry pipe etc., and suitable for the welding of deep water compound pipeline complex pipeline and pressure vessel.
The above, is only presently preferred embodiments of the present invention, not makees any formal limitation to the present invention, all It is any simple modification, equivalent variations and the modification made according to the technical spirit of the present invention to above example, still falls within In the range of technical solution of the present invention.

Claims (4)

1. a kind of process of composite bimetal pipe two-sided welding, it is characterised in that including step:
(1) welding preparation process:
(1) groove makes:Process two-sided compound bevel;
(2) groove group pair:Check retaining wall on slope quality, it is ensured that groove group pair is carried out after the integrity of groove and its near zone, Groove group is 3mm to 5mm to gap;
(3) corrosion resistance processing is carried out to groove liner surface;
(4) wlding selection and cleaning;
(5) composite bimetal pipe to be welded is preheated;
(2) plain steel back cover welding sequence:Argon-are welding technology, is carried out using individual layer single-run welding by multiple tube carbon steel side Back cover is welded;
(3) plain steel hot bead welding sequence:Argon-are welding technology, using individual layer single-run welding, two welder's symmetrical weldings;
(4) plain steel filling and cover welding process:
Welding procedure is filled from argon tungsten-arc welding filling welding, semi-automatic carbon dioxide gas shielded arc welding filling welding or machine Tool submerged-arc welding filling welding;
Cover welding process selection semi-automatic carbon dioxide gas shielded arc welding cover welding or mechanical submerged-arc welding capping welding;
Wherein, the filling of semi-automatic carbon dioxide gas shielded arc welding and capping, all-position welding is selected according to standard AWS D1.1; Mechanical submerged-arc welding completes filling or cover welding according to standard AWS D1.1 from downhand position;
(5) the anti-corrosion polishing of inner liner groove and cleaning:
Backing run root reinforcement is polished flat;It will be cleaned out in the range of at least 25mm of weld seam and its both sides;Anti-corrosion internal layer Before built-up welding, welding wire, welding groove and both sides at least 25mm scopes inner region are cleaned with absolute ethyl alcohol;To contact welding region Object cleaned with absolute ethyl alcohol;
(6) anti-corrosion inner liner built-up welding:
Inner liner built-up welding is carried out using shielded metal arc welding process, at least ensures two layers of four road built-up welding;
The composite bimetal pipe basic material is the low temperature carbon steel that tensile strength is not less than 450MPa, and anti-corrosion inner liner material is Ni-based 625 alloy, metallurgical binding between matrix and inner liner;Plain steel wlding selects AWS A5.18 argon-arc welding wires+AWS A5.17 welding wire for submerged-arc welding or AWS A5.18 argon-arc welding wire+AWS A5.29 carbon dioxide gas arc welding welding wires, inner liner wlding For AWS A5.11E NiCrMo-3 wldings;
In the step (1), groove uses two-sided compound bevel, and the structure of the two-sided compound bevel is outer including what is be integrally connected Groove and internal groove two parts, the outer groove are located at matrix side;And outer groove is that side is bottom groove gradient 37.5 ± 2.5 Degree, 10 ± 2.5 degree of top groove gradient, opposite side gradient are at least 30 ± 2.5 degree of single V compound bevels, and single V is combined Root face 2 is to 3mm, and groove gap 3 to 5mm, the outer side lower part groove of groove one is flex point with top groove junction, and this is turned The vertical range of point to internal groove top surface is at least 20mm;The internal groove is the trapezoidal groove that gradient is 45 ± 5 degree, the inner slope The distance 4 of mouth top surface to inner liner is at least 2mm, and the unilateral groove length 11 of internal groove top surface is at least 6mm;Groove makes and adopted With the method for machining or machining+polishing;
It is described that groove liner surface is carried out corrosion resistance to handle to be to carry out groove liner surface with copper/saturated copper sulphate solution Etching, to confirm the Ni-based residual for removing carbon steel surface completely;
The wlding selection and cleaning, are to select corresponding wlding according to mother metal/wlding matching principle is one-to-one, and according to Welder Two kinds of welding procedures of different choice of condition carry out mechanical submerged-arc welding to multiple tube carbon steel base layer and semi-automatic carbon dioxide is protected Protect the wlding type selecting of weldering;
Plain steel wlding selects TG-S50 argon arc welding back covers;From TG-S50 argon arc weldings, the semi-automatic titanium dioxides of DW-A55L SR Carbon gas shielded arc welding or LA-71 submerged-arc weldings filling, wherein submerged arc flux are 880M;From the semi-automatic titanium dioxides of DW-A55L SR Carbon gas shielded arc welding or LA-71 submerged-arc welding cappings, wherein submerged arc flux are 880M;Inner liner wlding is INCONEL WE112 Welding rod;After wlding is ready, cleaned before welding with ethanol solution;
Described is, according to standard ASME B31.3 requirements, to be entered according to compound thickness of pipe wall to composite bimetal pipe preheating to be welded Row weld preheating.
2. the process of composite bimetal pipe two-sided welding according to claim 1, it is characterised in that the step (2) plain steel back cover welding sequence, when carrying out back cover welding to multiple tube carbon steel using argon arc welding technique, two welderings Work point does not stand on the both sides of multiple tube, and 1 people is by 6 o'clock position welded clockwise to 12 o'clock position, and another people is by 6 o'clock position It is soldered to 12 o'clock position counterclockwise.
3. the process of composite bimetal pipe two-sided welding according to claim 1, it is characterised in that the step (5) the polishing of anti-corrosion inner liner groove and cleaning, it is necessary to use used aluminum oxide/carbon not on carbon steel or low alloy steel SiClx grinding wheel polishes flat backing run root reinforcement;Using stainless steel steel brush by weld seam and its both sides at least 25mm scopes Inside clean out, to prevent adverse effect that paint, grease, iron rust, dirt and other materials are caused to weld seam.
4. the process of composite bimetal pipe two-sided welding according to claim 1, it is characterised in that the step (2) in plain steel back cover welding sequence, back cover welding parameter setting is that tungsten electrode type is containing 2%CeO2Cerium tungsten electrode, argon Gas purity 99.99%, 18~22L/Min of flow, 110~160A of welding current, 11~14V of weldingvoltage, speed of welding 95~ 110mm/min, maximum heat input 1.2KJ/mm;
In the plain steel hot bead welding sequence of the step (3), hot bead welding parameter be set as tungsten electrode type be containing 2%CeO2Cerium tungsten electrode, purity of argon 99.99%, 18~22L/Min of flow, 170~220A of welding current, weldingvoltage 11 ~14V, speed of welding 160~190mm/min, maximum heat input 1.1KJ/mm;
In the plain steel filling of the step (4) and cover welding process, filling welding parameter setting:Argon tungsten-arc welding is filled out It is that tungsten electrode type is containing 2%CeO to fill welding parameter2Cerium tungsten electrode, purity of argon 99.99%, 18~22L/Min of flow, welding 170~230A of electric current, 11~14V of weldingvoltage, speed of welding 170~190mm/min, maximum heat input 1.1KJ/mm;Half certainly Dynamic carbon dioxide gas arc welding filling welding parameter is 160~210A of welding current, 160~300mm/Min of speed of welding, control Input quantity no more than 1.7KJ/mm is heated, welding protection gas is 20%CO2+ 80%Ar gaseous mixtures, 15~25L/ of gas flow Min;Mechanical submerged-arc welding filling welding parameter is 240~500A of welding current, 400~600mm/Min of speed of welding, and control heat is defeated Enter amount no more than 2.2KJ/mm;Cover welding parameter setting:Semi-automatic carbon dioxide gas shielded arc welding cover welding parameter is weldering 150~180A of electric current, 160~200mm/Min of speed of welding are met, control heat input is not more than 1.5KJ/mm, welding protection gas For 20%CO2+ 80%Ar gaseous mixtures, 15~25L/Min of gas flow;Mechanical submerged-arc welding capping welding parameter is welding current 250~470A, 420~600mm/Min of speed of welding, control heat input are not more than 2.1KJ/mm;
In the anti-corrosion inner liner built-up welding process of the step (6), the parameter setting of shielded metal arc welding process for welding current 60~ 95A, 85~120mm/Min of speed of welding, control heat input are not more than 1.6KJ/mm, and at least ensure two layers of four road built-up welding.
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