CN102848048A - Pipeline welding method - Google Patents
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- CN102848048A CN102848048A CN2012103299393A CN201210329939A CN102848048A CN 102848048 A CN102848048 A CN 102848048A CN 2012103299393 A CN2012103299393 A CN 2012103299393A CN 201210329939 A CN201210329939 A CN 201210329939A CN 102848048 A CN102848048 A CN 102848048A
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Abstract
The invention discloses a pipeline welding method which includes the steps: firstly, processing and assembling a weld joint to form a correct welding joint form; secondly, selecting a GTAW (gas tungsten arc welding) and SMAW (shielded metal arc welding) combined welding method for welding; and thirdly, performing post-weld heat treatment for the finished weld joint. The root is made of welding materials fine in anti-cracking performance, and the GTAW method is selected to effectively inhibit the cracking tendency of the root. The strength of the weld joint is guaranteed by the combined strength of two kinds of welding materials, and the overall strength of the joint is higher than the strength of a base material.
Description
Technical field
The present invention relates to the welding procedure of a kind of high strength/superhigh intensity steel pipe, specifically be used for the integral solder process program of the low-alloy high pressure line on deep water/super deep water marine rig.
Background technology
At present, the investment of oil bound pair marine oil and gas is increasing, and particularly the importance of the exploration and development of deep-sea and cold marine site oil and strategic position more and more receive the industry concern.Drilling rig is the core apparatus of marine drilling platform, for deep water and super deep water marine drilling platform, because the requirement of operating water depth and drilling depth, the pressure piping relevant with mud/cement/throttling/kill-job/systems such as well control must adopt the super-high strength steel pipe could satisfy instructions for use.
Wherein, super deep water (Ultra-Depth Water, be called for short UDW) and ultradeep well drilling well (Ultra-Depth Drilling is called for short UDD) be the offshore oil drilling concept that constantly forms to deep water and deep stratum drilling well, distinguish in order to the common deep water of circle and common drilling well well depth in the recent decade.Generally take 〉=400m-≤1500m as deep water, 〉=1500m(or 5 000ft) is super deep water (UDW); General drilling depth ability 〉=15, and 000ft (namely 4,500m)-≤25,000ft (namely 7,620m) be deep drilling; 〉=25,000ft (620m) is ultradeep well drilling well (UDD) namely 〉=7.
Such pipeline in use mainly has following characteristics: (1) is mainly used in the conveying of high-pressure slurry and cement, is the main pipeline of well system, may cause stopping of drillng operation in case lose efficacy, and causes huge economic loss; That (2) this type of pipeline designs pressure is minimum is 7500PSI(52MPa), wherein cross halfpipe and reach 15000PSI(103MPa), super-pressure pipeline category belonged to, and the position is in the central area of platform, in case fracture will cause major disaster; (3) design period of such platform generally is at least 25 years, will at the deep-sea long service, although this type of pipeline is had the very strict system of making regular check on, can carry out the chance of maintenance seldom after the operation.
In the use procedure, this type of pipeline must guarantee following basic demand, and the overall performance of welding point also must satisfy these requirements: (1) therefore must guarantee that material has minimum yield strength and the tensile strength that meets the demands owing to bearing hyperpressure; (2) dynamic loading and bear impact of water hammer might be born periodically in the running, therefore its good fracture mechanical property must be guaranteed; (3) because pumped (conveying) medium has corrosivity, therefore must have the performance of anti-H2S corrosion; (4) working in the platform of Beihai area need to be in the cold environment operation, and the general design work temperature of this part platform is at least-20 ℃, so this part high pressure line must have good low-temperature impact toughness.
With respect to other the installation welding of Naval Architecture and Ocean Engineering pipeline, such pipeline mainly has following characteristics in welding process is installed: (1) welding position is changeable, particularly at the scene in the welding process, relate to all contingent welding positions, this is comprising the welding in various obstacle situations; (2) welding surroundings is changeable, might weld under-20 ℃ Cold Winter environment, might need work high above the ground; (3) because the mother metal that welds is the strong quenched and tempered steel of superelevation, wall thickness is thicker simultaneously, so the fracture tendency of weld seam is larger; (4) welding of this part pipeline and examination requirements are in the technical specification book and industry standard of all items, this comprises the requirement of the multinomial international industry standard of the standards such as ASME, API, NORSOK, all require to treat according to highest ranking, need to carry out the flaw detection of 100% gamma rays and magnetic powder inspection, and carry out the evaluation of weldquality with first water grade or the standard that exceeds the first water grade.
In sum, its stability of the difficult quality guarantee of this type of pipeline in welding process in use must guarantee absolute security again, so must satisfy the strictest quality requirement again.Although for the existing a large amount of Successful Practice of the welding of unimach, but for need under various harsh execution conditions, welding, need to satisfy so many performance requirement, and to guarantee the stability of construction quality, this is just to the welding construction technology, the welding process quality control has very high requirement with evaluation, and this type of engineering practice successful experience lacks very much at present.
Summary of the invention
The present invention proposes a kind of pipeline welding method, to solve its stable defective of difficult quality guarantee in the prior art welding process.
For achieving the above object, the present invention proposes a kind of pipeline welding method, may further comprise the steps:
Step 1: Welded Joints is processed and is assembled, and forms correct joint form;
Step 2: select the welding method of GTAW+SMAW combination to weld;
Step 3: the welding point of finishing is carried out post weld heat treatment.
Wherein, the chemical composition scope of the material of described pipeline is (%): C :≤0.35, Mn :≤1.05, P :≤0.04, S :≤0.04, Si :≤1.00, Cr :≤2.75, Mo :≤1.50, V≤0.30; Mechanical performance requires: tensile strength: 〉=620MPa, and yield strength: 〉=415MPa, percentage elongation: 〉=17%, the contraction percentage of area: 〉=35%, hardness (HRC) :≤22, the impact flexibility peak demand: under-30 ℃ 〉=42J.
Wherein, in step 1, described groove type is: the groove root gap is 1-4mm, and the root root face is 0-1mm, and groove width is 0.7-1.5 pipeline wall thickness doubly.
Wherein, in step 2, at first use the GTAW bottoming, then use GTAW to be filled to 6-8mm thickness, re-use SMAW and fill and capping.
Wherein, in step 2, the welding parameter during welding is: root uses manual argon arc welding: use diameter to be the welding wire of 2.0mm, electric current 130-150A, voltage 10-15V, argon flow amount 10-15/min, heat input 10-30KJ/cm; Use the stick electrode arc welding during filling: select diameter to be the welding rod of 3.2mm, electric current 100-160A, voltage 19-25V, heat input 10-35KJ/cm; Use the stick electrode arc welding during capping: select diameter to be the welding rod of 3.2mm, electric current 110-150A, voltage 19-25V, heat input 10-30KJ/cm.
Wherein, in step 2, preheat temperature and interlayer temperature are not less than 120 ℃ in the welding, and are not higher than 250 ℃, pre-thermal recovery electrical heating method, and being heated to temperature is 150-300 ℃, then is cooled to the preheat temperature of process stipulation.
Wherein, in step 2, the width of heating tape is take the counterpart center line as benchmark, and both sides respectively are not less than 3 times of wall thickness, and are not less than 100mm.
Wherein, in step 2, positioning weldering before formal welding, using before the tack welding mouthpart is carried out the joint dimension calibration, this uses tack welding to mouthpart and finishes and be cooled to before the room temperature.
Wherein, tack welding uses the location of putting up a bridge.
Wherein, the preheat temperature of tack welding is higher than 50 ℃ of the preheat temperatures of formal welding.
Wherein, the tack welding weld seam is the 4-6 road and evenly distributes.
Wherein, in step 2, weld complete after, use heat-preservation cotton to cover welding point and make welding point slowly cool to room temperature.
Wherein, in step 3,630-670 ℃ of post weld heat treatment temperature, temperature retention time are 1-3 hour.
In addition, the present invention also proposes the pipeline that above-mentioned pipeline welding method welding obtains.
And, the invention allows for the rig that comprises above-mentioned pipeline.
And, the invention allows for the application of above-mentioned rig in the ocean.
Adopt the present invention, its root is selected preferably welding material of cracking resistance, and selects the GTAW welding method, the crackle tendency of establishment root.The intensity of Welded Joints adopts the combined strength of two kinds of wldings to guarantee, the bulk strength of this joint is higher than the intensity of mother metal.
Description of drawings
Fig. 1 a is the groove type schematic diagram among the present invention;
Fig. 1 b to Fig. 1 e is the typical evolving form schematic diagram of groove type of the present invention.
Fig. 2 a is that the groove type of bridging positioning welding among the present invention requires schematic diagram;
Fig. 2 b and Fig. 2 c are tack welding typical case evolving form schematic diagram among the present invention;
Fig. 3 is the set-up mode schematic diagram of rope form heater and heat-preservation cotton during heat treatment when wall thickness is identical among the present invention;
Fig. 4 is the set-up mode schematic diagram of rope form heater and heat-preservation cotton during heat treatment when wall thickness is different among the present invention;
Fig. 5 is the groove parameter schematic diagram of the embodiment of the invention 1;
Fig. 6 is the heat treatment cycle curve figure of the embodiment of the invention 1;
Fig. 7 is the flow chart of steps of tubing welding method of the present invention.
Wherein, Reference numeral:
Among Fig. 2 a: 1-bridging tack weld
Among Fig. 2 b and Fig. 2 c: the 1-tack weld; 2-bridging locating piece
Among Fig. 3 and Fig. 4: the formal weld seam of 1-; 3-rope form heater; The 4-heat-preservation cotton; The 5-pipeline
The specific embodiment
The present invention proposes a kind of welding method of tubing, the integral solder construction method that is particularly useful for high-strength/strong high pressure line of superelevation, be specially adapted to the welding method of marine rig high pressure line, more be specially adapted to the rig high pressure line welding method of ocean deepwater/super deepwater environment, the welding point mechanical performance of its formation satisfies the requirement of all industry standards and leaves certain margin of safety, in the welding procedure process, when guaranteeing its good operability, also can well guarantee the stability of its welding quality.
Wherein, there is no unified definition and sorting technique both at home and abroad for high strength/superhigh intensity, generally take to divide and divide according to strengthening mechanism according to intensity.Can be divided into high-strength steel and super-high strength steel by the intensity division: 1. divide by tensile strength: high-strength steel: TS 〉=340MPa(is cold rolling); TS 〉=370MPa(hot rolling and pickling) super-high strength steel: TS＞590MPa; 2. divide by yield strength: high-strength steel: YS 〉=210MPa, super-high strength steel: YS＞550MP, institute's steel strength that uses still also are applicable to high strength steel pipe (the minimum intensity requirement is lower than this limit in the part standard) in the superhigh intensity scope.
For the high-pressure and high pressure pipelines is not the same as the definition of national definitions: general process piping in the international standard ASME B31.3 high-pressure pipeline section has the following description: This Chapter Pertains To Piping Designated By The owner as being in High Pressure Fluid Service.Its requirements are to be applied in full to piping so designated.High pressure is considered herein to be pressure in excess of that allowed by the ASME B16.5 Class 2500 rating for the specified design temperature and material group.However , there are no specified pressure limitations for the application of these rules. That is, the normal temperature of the fluid medium in the transport case of sound pressure can be defined as more than 20Mpa high pressure line .In China special equipment standard TSGD3001, for industrial pipeline, any fluid namely is defined as highest level as long as surpass 10Mpa.
The present invention is by the following technical solutions:
A kind of pipeline welding method that the present invention is disclosed, the welding procedure of especially a kind of deep water/strong pipeline of superelevation that super deep water marine rig uses as shown in Figure 7, may further comprise the steps:
Step 1: Welded Joints is processed and is assembled, and forms correct joint form;
Step 2: select the welding method of GTAW+SMAW combination to weld;
Step 3: the welding point of finishing is carried out post weld heat treatment
Particularly:
The piping material that the present invention adopts has following characteristics: the chemical composition scope is (%): C :≤0.35, Mn :≤1.05, P :≤0.04, S :≤0.04, Si :≤1.00, Cr :≤2.75, Mo :≤1.50, V≤0.30.Typical mechanical performance requires: tensile strength: minimum 620MPa, yield strength: minimum 415MPa, percentage elongation: minimum 17%, the contraction percentage of area: minimum 35%, hardness (HRC): the highest by 22, the impact flexibility peak demand: in fact this is a higher requirement to-30 ℃ of lower minimum 42J(, is applicable to comparatively harsh marine site, for example the Norway marine site; If lower requirement can reach too, specifically decide according to design conditions).Wherein, HR is Rockwell hardness, and HRC is the hardness that adopts 150Kg load and diamond cone injector to try to achieve, and is used for the very high material of hardness.Such as: hardened steel etc. its measuring method is, under the plus load of regulation, steel ball or diamond penetrator vertically are pressed into the surface of material to be tried, produce indenture, the indenture degree of depth after removing according to load utilizes Rockwell hardness to calculate formula HR=(K-H)/C just can calculate Rockwell hardness.Rockwell hardness number is presented on the scleroscopic dial plate, can directly read.Use HRC to describe more brief and more professional.
Wherein, in the step 1, groove type: as shown in Figure 1a, to not restriction of bevel angle, be 1-4mm but require groove root gap a3, root root face a4 is 0-1mm, and groove width a2 is 0.7-1.5 pipeline wall thickness a5 doubly.Wherein dotted line is depicted as the single face V-butt of bilateral symmetry.
Fig. 1 b to Fig. 1 e is the typical evolving form schematic diagram of the application's groove, shown in Fig. 1 b to Fig. 1 e, Fig. 1 b is single U groove, and Fig. 1 c is the single face V-butt that the bottom is widened, Fig. 1 e is asymmetric single face V-butt, and Fig. 1 d is depicted as the combining form of Fig. 1 c and single bevel groove.
Above groove respectively has its characteristics: Fig. 1 b can form the weld seam that the narrower while does not hinder operation, and Fig. 1 c more easily processes than Fig. 1 b, and Fig. 1 e is applicable to some specific position, and the situation of Fig. 1 d can occur often in the pipe fitting docking of different manufacturers.Only be the part common situations below, can also develop out other forms.
Wherein, in the step 2, the welding method of selecting is the GTAW+SMAW combination: at first use the GTAW bottoming, then use GTAW to be filled to 6-8mm thickness, re-use SMAW and fill and capping.
Wherein, the welding material of selecting satisfies following the requirement: the integrity of welded joint after 1, finally finishing can must satisfy the minimum requirements of pipeline material mechanical performance, and this comprises the requirements such as intensity, low-temperature impact toughness, hardness; 2, the content requirement for Ni, S, P has strict restriction, guarantees the ability of its resisting sulfide stress corrosion fracture (SSC) or stress corrosion cracking (SCC) (SCC).
Wherein, in step 2, the main welding parameter during welding is as follows: root uses manual argon arc welding: use diameter to be the welding wire of 2.0mm, electric current 130-150A, voltage 10-15V, argon flow amount 10-15/min, heat input 10-30KJ/cm; Use the stick electrode arc welding during filling: select diameter to be the welding rod of 3.2mm, electric current 100-160A, voltage 19-25V, heat input 10-35KJ/cm; Use the stick electrode arc welding during capping: select diameter to be the welding rod of 3.2mm, electric current 110-150A, voltage 19-25V, heat input 10-30KJ/cm.
Wherein, in the step 2, adopt preheat temperature and interlayer temperature to be not less than 120 ℃ in the welding, and be not higher than 250 ℃, along with the increase (when for example, wall thickness is 40mm) of wall thickness or the enhancing of restraining should be increased to preheat temperature minimum 230 ℃.Pre-thermal recovery electrical heating method, being heated to temperature is 150-300 ℃, then is cooled to the preheat temperature of process stipulation.The width of heating tape is take the counterpart center line as benchmark, and both sides respectively are not less than 3 times of wall thickness, and are not less than 100mm.
In step 2, before welding, position weldering, that uses special use carries out the joint dimension calibration to mouthpart, and this should not withdrawn before tack welding is finished and is cooled to room temperature mouthpart, preferably was retained to begin before the welding.
Wherein, tack welding uses the location of putting up a bridge, and welding parameter is identical with formal welding procedure, and preheat temperature should be higher than the preheat temperature of welding procedure regulation simultaneously.The tack welding weld seam is the 4-6 road and evenly distributes.
Fig. 2 a is the substantive requirements of form schematic diagram of positioning welding among the present invention; Fig. 2 b and Fig. 2 c are tack welding typical case evolving form schematic diagram among the present invention; Shown in Fig. 2 a, non-root bridging tack weld 1 uses the argon arc welding welding; The bridging tack weld is positioned at groove away from the root part; Shown in Fig. 2 b and Fig. 2 c, bridging locating piece 2 materials are identical with pipeline, use argon arc welding or manual electric arc welding welding.The bridging locating piece of Fig. 2 b weld seam that is positioned is positioned pipeline outer wall, and the bridging locating piece of Fig. 2 c weld seam that is positioned is positioned in the groove away from the root part.
Wherein, after step 2 welding is complete, uses heat-preservation cotton 4 to cover welding point and make it to slowly cool to room temperature.
Wherein, in step 3, the welding point of finishing is carried out post weld heat treatment.630-670 ℃ of post weld heat treatment temperature, temperature retention time are 1-3 hour.Adopt rope form heater 3 and reasonable Arrangement heating region, the parts thermal treatment zone that wall thickness is larger should suitably enlarge, and should guarantee also that simultaneously thin wall component can not be overheated.
Fig. 3 is the set-up mode schematic diagram of rope form heater and heat-preservation cotton during heat treatment when wall thickness is identical among the present invention; Fig. 4 is the set-up mode schematic diagram of rope form heater and heat-preservation cotton during heat treatment when wall thickness is different among the present invention; Formal weld seam 1 has welded completely among Fig. 3 and Fig. 4, and as shown in Figure 3, when pipeline 5 wall thickness were identical, take the counterpart center line as benchmark, rope form heater 3 arranged that the width a1 of heating regions is at least 3 times of wall thickness; As shown in Figure 4, when pipeline 5 wall thickness not simultaneously, take the counterpart center line as benchmark, arrange that than small end rope form heater 3 the width a1 of heating region is at least 3 times of wall thickness in wall thickness, arrange that in the larger end rope form of wall thickness heater 3 the width a6 of heating region is at least the wall thickness of 3 times of thicker parts.
In addition, the invention allows for the pipeline that obtains through the welding of aforementioned tube welding method.
Further, the invention allows for the rig that comprises above-mentioned pipeline, particularly deep-well/ultradeep well rig.
Further, the invention allows for the application of above-mentioned rig in the ocean, particularly the application in deep water/super deep water ocean.
Embodiment
Below in conjunction with example with put into practice case the present invention is described in further details, so that those skilled in the art understand the present invention better, be not limiting the scope of the invention.
Embodiment 1:
One surpassing on the deep water semi-submersible drilling platform, the high-pressure slurry pipeline of use is: the material of ASTM A519Gr.4130, and supply of material state is generally modified, and the chemical composition scope of ASTM regulation and stipulation and mechanical performance require to see Table 1 and table 2.
The chemical composition scope (%) of table 1ASTM A519Gr.4130
| Grade of steel | C | Mn | Cr | Mo | P | S | Si |
| ASTM A519Gr.4130 | 0.28-0.33 | 0.40-0.60 | 0.80-1.10 | 0.15-0.25 | ≤0.04 | ≤0.04 | 0.15-0.35 |
The typical machine performance of table 2ASTM A519Gr.4130
| Grade of steel | State | Tension (MPa) | Surrender (MPa) | Percentage elongation (%) |
| ASTM A519Gr.4130 | Modified | 724 | 586 | 20% |
According to the Offshore Platform Construction code requirement, need additional impact flexibility requirement, because the platform of building will be on active service in zone, the Norway North Sea, need to satisfy the requirement of NORSOK standard, so additional impact flexibility requires to be decided to be-30 ℃ of lower minimum 42J.According to the NACE standard, additional requirement is the highest 22HR aspect material hardness.
Welding material is selected OK Tigrod 13.26 and the Filarc 118 of her Sa (Esab) of Sweden, and corresponding AWS (AWS) grade is respectively: ER80S-Ni1 and E11018-M, the welding protection gas of GTAW adopts straight argon.Its chemical composition and mechanical performance are shown in following table 3 and table 4:
The main chemical compositions content (%) of table 3 wlding
| The wlding trade mark | C | Si | Mn | Ni | Mo | P | S | Cu |
| OK Tigrod 13.26 | 0.11 | 0.81 | 1.38 | 0.88 | - | 0.022 | 0.009 | 0.48 |
| Filarc 118 | 0.053 | 0.38 | 1.78 | 2.2 | 0.42 | 0.012 | 0.008 | 0.02 |
The typical machine performance of table 4 wlding
| The wlding trade mark | Tension (MPa) | Surrender (MPa) | Impact property (J) | Percentage elongation (%) |
| OK Tigrod 13.26 | 480 | 580 | -40℃，60 | 30 |
| Filarc 118 | 720 | 780 | -51℃，90 | 23 |
As shown in Figure 5, bevel for welding is selected the single face V-butt, and bevel angle α is 55 ± 5 °, and groove root gap a3 is 2mm, and root root face a4 is 0-1mm, and unfitness of butt joint must not be greater than 1mm.
Tack welding should use the location of putting up a bridge, and avoids using the root location as far as possible, and welding procedure should be identical with formal welding procedure, and preheat temperature should be higher than 50 ℃ of welding procedures simultaneously.The tack welding weld seam should enough and evenly distribute.Use during the groove assembling mouthpart is aligned, and before formal welding, remove.
Groove and edge surfaces externally and internally thereof should be not less than 20 millimeters oil, lacquer, dirt, rust in the scope etc. before the weldering removes clean.As not welding the same day, should use adhesive tape that weld bond is protected.
Main welding parameter during welding is as follows:
Table 5 welding parameter
Use higher preheating and interlayer temperature in the welding, temperature should not be lower than 150 ℃, along with the increase of wall thickness or contained enhancing should be increased to preheat temperature minimum 230 ℃.
At first use the GTAW bottoming, then use GTAW to be filled to 8mm thickness, re-use SMAW and fill and capping.To hindering weld to use abrasive machine to grind off tack weld, the careful finishing at tack weld place can be carried out when welding herein again in bottoming.
In the manual electric arc welding welding process, should be noted following some: weld each layer (road) face of weld and should try one's best smoothly, be easy to take off slag, reduce the polishing amount of convex weld, better control the break time of lower floor's welding, reduced the generation of weld defect.Each layer (road) weld seam should be polished into the gentle slope shape with receiving the arc place before joint, at the front end of the joint area electric arc that ignites, pull back and normally weld to the joint, speed of welding is slightly slow during capping, make the teeter arc manipulation, welding rod is transported to fast the groove limit and has a break, and makes smooth welding joint.
After welding is finished, carry out as early as possible post weld heat treatment, its heat treatment cycle curve is as shown in Figure 6, for example, be the pipeline of 141mm * 31.75mm to specification, 650 ± 10 ℃ of post weld heat treatment temperature, temperature retention time approximately 90 minutes, wherein, T1 is controlled ramp not, and T2 is controlled ramp, T3 is insulation, T4 is controlled cooling, and T5 is the nature cooling, and heat treatment cycle curve as shown in Figure 6.
Beneficial effect of the present invention:
1, root of the present invention is selected preferably welding material of cracking resistance, and selects the GTAW welding method, the crackle tendency of establishment root.
2, the intensity of Welded Joints adopts the combined strength of two kinds of wldings to guarantee.The bulk strength of this joint is higher than the intensity of mother metal.
3, root is selected the wlding of strict control Ni, S, P content, has guaranteed the ability to the resisting sulfide stress corrosion fracture (SSC) in the use procedure or stress corrosion cracking (SCC) (SCC).
4, selection of electrodes removability of slag material has preferably reduced the probability of slag inclusion under the condition that is difficult to weld.
5, adopted the mode of mouthpart and non-root positioning combination has been carried out joint location, effectively prevented the generation probability of the generation of root defect, particularly crackle.
6, adopted the Combination Welding mode of GTAW+SMAW, this dual mode is connected to preferably all position welding and adapts to, and in the situation that narrow space with have barrier still can process flexibly.
7, optimize welding condition, simultaneously the welding groove type has not been had strict restriction, it can be finely tuned according to actual operational position, better guaranteed its operability.
8, to the restriction of heat treatment holding temperature, can guarantee can not affect after the heat treatment mechanical property of joint, this integral body that comprises intensity to metal structure, impact flexibility, hardness guarantees.For example: for the pipeline of ASTM A519Gr.4130 material, can guarantee that mechanical performance reaches following standard: tensile strength: 〉=620MPa, yield strength: 〉=415MPa, impact flexibility :-30 ℃ of lower minimum 42J, hardness (HRC) :≤22.
9, heat treatment is used the restriction of equipment and canoe, guaranteed the balance in temperature field.Can guarantee the stable of thermal treatment quality.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (16)
1. a pipeline welding method is characterized in that, may further comprise the steps:
Step 1: Welded Joints is processed and is assembled, and forms correct joint form;
Step 2: select the welding method of GTAW+SMAW combination to weld;
Step 3: the welding point of finishing is carried out post weld heat treatment.
2. pipeline welding method according to claim 1 is characterized in that, the chemical composition scope of the material of described pipeline is (%): C :≤0.35, Mn :≤1.05, P :≤0.04, S :≤0.04, Si :≤1.00, Cr :≤2.75, Mo :≤1.50, V≤0.30; Mechanical performance requires: tensile strength: 〉=620MPa, and yield strength: 〉=415MPa, percentage elongation: 〉=17%, the contraction percentage of area: 〉=35%, hardness (HRC) :≤22, the impact flexibility peak demand: under-30 ℃ 〉=42J.
3. pipeline welding method according to claim 1 is characterized in that, in step 1, described groove type is: the groove root gap is 1-4mm, and the root root face is 0-1mm, and groove width is 0.7-1.5 pipeline wall thickness doubly.
4. pipeline welding method according to claim 1 is characterized in that, in step 2, at first uses the GTAW bottoming, then uses GTAW to be filled to 6-8mm thickness, re-uses SMAW and fills and capping.
5. pipeline welding method according to claim 4 is characterized in that, in step 2, welding parameter during welding is: root uses manual argon arc welding: use diameter to be the welding wire of 2.0mm, electric current 130-150A, voltage 10-15V, argon flow amount 10-15/min, heat input 10-30KJ/cm; Use the stick electrode arc welding during filling: select diameter to be the welding rod of 3.2mm, electric current 100-160A, voltage 19-25V, heat input 10-35KJ/cm; Use the stick electrode arc welding during capping: select diameter to be the welding rod of 3.2mm, electric current 110-150A, voltage 19-25V, heat input 10-30KJ/cm.
6. pipeline welding method according to claim 1 is characterized in that, in step 2, preheat temperature and interlayer temperature are not less than 120 ℃ in the welding, and are not higher than 250 ℃, pre-thermal recovery electrical heating method, being heated to temperature is 150-300 ℃, then is cooled to the preheat temperature of process stipulation.
7. according to claim 1 or 6 described pipeline welding methods, it is characterized in that, in step 2, the width of heating tape is take the counterpart center line as benchmark, and both sides respectively are not less than 3 times of wall thickness, and are not less than 100mm.
8. pipeline welding method according to claim 1 is characterized in that, in step 2, is positioning weldering before formal welding, uses before the tack welding mouthpart is carried out the joint dimension calibration, and this uses tack welding to mouthpart and finishes and be cooled to before the room temperature.
9. pipeline welding method according to claim 8 is characterized in that, described tack welding uses the location of putting up a bridge.
10. pipeline welding method according to claim 8 is characterized in that, the preheat temperature of described tack welding is higher than the preheat temperature of formal welding.
11. pipeline welding method according to claim 8 is characterized in that, the tack welding weld seam is the 4-6 road and evenly distributes.
12. pipeline welding method according to claim 1 is characterized in that, in step 2, weld complete after, use heat-preservation cotton to cover welding point and make welding point slowly cool to room temperature.
13. pipeline welding method according to claim 1 is characterized in that, in step 3,630-670 ℃ of post weld heat treatment temperature, temperature retention time are 1-3 hour.
14. the pipeline that the described pipeline welding method welding of any one obtains in claim 1 to 13.
15. comprise the rig of the pipeline of claim 14.
16. the application of the rig of claim 15 in the ocean.
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| CN201210329939.3A CN102848048B (en) | 2012-09-07 | 2012-09-07 | Pipeline welding method |
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| CN201210329939.3A CN102848048B (en) | 2012-09-07 | 2012-09-07 | Pipeline welding method |
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| CN102848048B CN102848048B (en) | 2015-11-25 |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103286414A (en) * | 2013-04-27 | 2013-09-11 | 中国石油天然气集团公司 | Welding method of oil gas transmission antisulphour steel pipelines |
| CN104214421A (en) * | 2014-08-27 | 2014-12-17 | 无锡市华牧机械有限公司 | Construction process for stainless steel tube |
| CN104439631A (en) * | 2014-10-14 | 2015-03-25 | 中国化学工程第十六建设有限公司 | Austenite furnace tube welding method |
| CN104475935A (en) * | 2014-11-24 | 2015-04-01 | 南京钢铁股份有限公司 | Field welding method for CO2-corrosion-resistant pipeline steel |
| CN104959710A (en) * | 2015-07-09 | 2015-10-07 | 成都振中电气有限公司 | Carbon steel pipe welding technology |
| CN106166639A (en) * | 2016-06-29 | 2016-11-30 | 西南石油大学 | A kind of welding method of low-alloy pipe line steel |
| CN106735900A (en) * | 2016-11-11 | 2017-05-31 | 北京首钢冷轧薄板有限公司 | A kind of method of laser welding |
| CN107052577A (en) * | 2017-03-14 | 2017-08-18 | 尊道（上海）自动化设备有限公司 | A kind of automatic press mounting welding equipment of automobile low-voltage fuel distribution pipe |
| CN107322135A (en) * | 2017-05-12 | 2017-11-07 | 中信重工机械股份有限公司 | A kind of double J section steels of small opening and its welding method |
| CN107378207A (en) * | 2017-07-26 | 2017-11-24 | 南通振华重型装备制造有限公司 | A kind of 4130 high-voltage tube high-efficiency welding methods |
| CN107598332A (en) * | 2017-10-16 | 2018-01-19 | 山东电力建设第工程公司 | The welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel |
| CN108161185A (en) * | 2017-12-11 | 2018-06-15 | 中盐金坛盐化有限责任公司 | A kind of salt hole air reserved storeroom injection-production column jacket welding procedure |
| CN108465917A (en) * | 2018-03-02 | 2018-08-31 | 武汉钢铁有限公司 | A kind of mariages two pass buried arc welding method suitable for multi-level steel |
| CN108486455A (en) * | 2018-04-25 | 2018-09-04 | 三明市金圣特种钢有限公司 | A kind of production method of steel-casting |
| CN108927587A (en) * | 2018-07-23 | 2018-12-04 | 中国化学工程第十四建设有限公司 | Pipeline processing technique in paraffin base lubricating oil hydrogenation plant |
| CN109420818A (en) * | 2017-08-28 | 2019-03-05 | 宝山钢铁股份有限公司 | A kind of welding method of underground natural gas storage tank casing |
| CN111961985A (en) * | 2020-08-19 | 2020-11-20 | 合肥工业大学 | Low-cost die steel with high thermal conductivity at high temperature and preparation method thereof |
| CN113681126A (en) * | 2021-08-31 | 2021-11-23 | 烟台中集来福士海洋工程有限公司 | Welding process of super duplex stainless steel dissimilar high alloy material |
| CN114247960A (en) * | 2021-12-14 | 2022-03-29 | 北京城建集团有限责任公司 | Welding process for steel pipe in snow making system |
| CN114762909A (en) * | 2021-01-13 | 2022-07-19 | 宝山钢铁股份有限公司 | Gas shielded welding method for low-alloy high-strength steel flux-cored wire |
| CN115502518A (en) * | 2022-10-10 | 2022-12-23 | 中国化学工程第十四建设有限公司 | Manufacturing and assembly welding process of thin-wall lining welding type plastic-coated steel pipe |
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| CN103286414A (en) * | 2013-04-27 | 2013-09-11 | 中国石油天然气集团公司 | Welding method of oil gas transmission antisulphour steel pipelines |
| CN104214421A (en) * | 2014-08-27 | 2014-12-17 | 无锡市华牧机械有限公司 | Construction process for stainless steel tube |
| CN104439631B (en) * | 2014-10-14 | 2017-02-01 | 中国化学工程第十六建设有限公司 | Austenite furnace tube welding method |
| CN104439631A (en) * | 2014-10-14 | 2015-03-25 | 中国化学工程第十六建设有限公司 | Austenite furnace tube welding method |
| CN104475935A (en) * | 2014-11-24 | 2015-04-01 | 南京钢铁股份有限公司 | Field welding method for CO2-corrosion-resistant pipeline steel |
| CN104959710A (en) * | 2015-07-09 | 2015-10-07 | 成都振中电气有限公司 | Carbon steel pipe welding technology |
| CN106166639A (en) * | 2016-06-29 | 2016-11-30 | 西南石油大学 | A kind of welding method of low-alloy pipe line steel |
| CN106735900A (en) * | 2016-11-11 | 2017-05-31 | 北京首钢冷轧薄板有限公司 | A kind of method of laser welding |
| CN107052577A (en) * | 2017-03-14 | 2017-08-18 | 尊道（上海）自动化设备有限公司 | A kind of automatic press mounting welding equipment of automobile low-voltage fuel distribution pipe |
| CN107322135A (en) * | 2017-05-12 | 2017-11-07 | 中信重工机械股份有限公司 | A kind of double J section steels of small opening and its welding method |
| CN107378207A (en) * | 2017-07-26 | 2017-11-24 | 南通振华重型装备制造有限公司 | A kind of 4130 high-voltage tube high-efficiency welding methods |
| CN109420818A (en) * | 2017-08-28 | 2019-03-05 | 宝山钢铁股份有限公司 | A kind of welding method of underground natural gas storage tank casing |
| CN107598332A (en) * | 2017-10-16 | 2018-01-19 | 山东电力建设第工程公司 | The welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel |
| CN107598332B (en) * | 2017-10-16 | 2020-05-08 | 山东电力建设第一工程公司 | Novel CB2 heat-resistant steel medium-large diameter pipeline welding and heat treatment process |
| CN108161185A (en) * | 2017-12-11 | 2018-06-15 | 中盐金坛盐化有限责任公司 | A kind of salt hole air reserved storeroom injection-production column jacket welding procedure |
| CN108465917A (en) * | 2018-03-02 | 2018-08-31 | 武汉钢铁有限公司 | A kind of mariages two pass buried arc welding method suitable for multi-level steel |
| CN108465917B (en) * | 2018-03-02 | 2020-06-19 | 武汉钢铁有限公司 | Double-wire double-channel submerged arc welding method suitable for multi-grade steel |
| CN108486455A (en) * | 2018-04-25 | 2018-09-04 | 三明市金圣特种钢有限公司 | A kind of production method of steel-casting |
| CN108486455B (en) * | 2018-04-25 | 2020-05-15 | 三明市金圣特种钢有限公司 | Production method of steel casting |
| CN108927587A (en) * | 2018-07-23 | 2018-12-04 | 中国化学工程第十四建设有限公司 | Pipeline processing technique in paraffin base lubricating oil hydrogenation plant |
| CN111961985A (en) * | 2020-08-19 | 2020-11-20 | 合肥工业大学 | Low-cost die steel with high thermal conductivity at high temperature and preparation method thereof |
| CN114762909A (en) * | 2021-01-13 | 2022-07-19 | 宝山钢铁股份有限公司 | Gas shielded welding method for low-alloy high-strength steel flux-cored wire |
| CN113681126A (en) * | 2021-08-31 | 2021-11-23 | 烟台中集来福士海洋工程有限公司 | Welding process of super duplex stainless steel dissimilar high alloy material |
| CN114247960A (en) * | 2021-12-14 | 2022-03-29 | 北京城建集团有限责任公司 | Welding process for steel pipe in snow making system |
| CN115502518A (en) * | 2022-10-10 | 2022-12-23 | 中国化学工程第十四建设有限公司 | Manufacturing and assembly welding process of thin-wall lining welding type plastic-coated steel pipe |
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