CN102848047B - Pipeline weld defect processing method - Google Patents
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Abstract
The present invention proposes a kind of pipeline weld defect processing method, comprises the following steps: step 1: butt welded seam carries out nondestructive inspection; Step 2: be the inner or defect of outer surface of weld seam or the defect of the root of weld according to the position of defect, determines the form of the groove formed; Step 3: welding method is determined in the formation according to formed groove, and butt welded seam welds; Step 4: after having welded, Welded Joints carries out post weld heat treatment.The weld defect adopting method of the present invention can confront on material carries out directly welding and reprocesses, a solder yield of 100% can be pursued, reduce process control requirements, and the flaw detection work before heat treatment can be exempted, and retubing is avoided after generation defect, this will reduce production cost greatly.
Description
Technical field
The present invention relates to the weld defect Rework Technics of a kind of high strength/superhigh intensity steel pipe, relate in particular to a kind of overall weld defect reworking plan of the low-alloy high pressure line newly made on deep water marine rig.
Background technology
At present, the investment of oil bound pair marine oil and gas is increasing, and the importance of the particularly exploration and development of deep-sea and cold marine site oil and strategic position are more and more subject to industry and pay close attention to.Drilling rig is the core apparatus of marine drilling platform, for deep water and ultra-deep-water marine drilling platform, due to the requirement of operating water depth and drilling depth, the pressure piping relevant with systems such as mud/cement/throttling/kill-job/well controls must adopt super-high strength steel pipe to meet instructions for use.Wherein, ultra-deep-water (Ultra-Depth Water, be called for short UDW) and ultra-deep well drilling (Ultra-Depth Drilling, be called for short UDD) be the offshore oil drilling concept that constantly formed to deep water and deep stratum drilling well, distinguish in order to the common deep water of circle and typical well well depth in the recent decade.Generally with >=400m-≤1500m for deep water, >=1500m(or 5,000ft) be ultra-deep-water (UDW); General drilling depth ability >=15,000ft (namely 4,500m)-≤25,000ft (namely 7,620m) are deep drilling; >=25,000ft (namely >=7,620m) is ultra-deep well drilling (UDD).
Such pipeline in use mainly has following characteristics: (1) is mainly used in the conveying of high-pressure slurry and cement, is the primary line of well system, may cause the stopping of drillng operation, and caused huge economic loss once lose efficacy; (2) that this type of pipeline designs pressure is minimum is 7500PSI(52MPa), wherein cross halfpipe and reach 15000PSI(103MPa), belong to super-pressure pipeline category, and position is in the central area of platform, once there is fracture will cause major disaster; (3) design period of such platform is generally at least 25 years, will at deep-sea long service after operation, and very strict make regular check on system although have this type of pipeline, the chance can carrying out maintenance is little.
In use procedure, this type of pipeline must ensure following basic demand, and the overall performance of welding point also must meet these and require: (1), owing to subject hyperpressure, therefore must ensure that material has the minimum yield strength and tensile strength met the demands; (2) likely bear periodicity dynamic loading in running and bear impact of water hammer, therefore must ensure its excellent fracture mechanical property; (3) therefore pumped (conveying) medium has corrosivity, therefore must have anti-H
2the performance of S corrosion; (4) platform working in Beihai area needs in cold environment operation, and the general design work temperature of this part platform is at least-20 DEG C, and therefore this part high pressure line must have excellent low-temperature impact toughness.
Relative to the erecting and welding of other Naval Architecture and Ocean Engineering pipeline, such pipeline mainly has following characteristics in erecting and welding process: (1) welding position is changeable, particularly at the scene in welding process, relate to all contingent welding positions, this is comprising the welding in various obstacle situation; (2) welding surroundings is changeable, likely needs to weld under the Cold Winter environment of-20 DEG C, likely needs work high above the ground; (3) because welded mother metal is the strong quenched and tempered steel of superelevation, wall thickness is thicker simultaneously, and therefore the fracture tendency of weld seam is larger; (4) welding and examination of this part pipeline requires in the Technical specification and industry standard of all items, this comprises the requirement of the multinomial international professional standard of the standards such as ASME, API, NORSOK, all require to treat according to highest ranking, need to carry out gamma rays flaw detection and the magnetic powder inspection of 100%, and with first water grade or exceed first water grade standard to carry out the evaluation of weldquality.
For this type of pipeline, due to its applying working condition, mechanical property requirements, the harshness of assembling and welding condition, for ensureing a solder yield, achieve the goal by strict whole control scheme, but this and do not mean that the possibility not having excessive defect to occur, simultaneously strict control also means higher production cost.As carried out retubing after discovery defect, cost will be very high.
If to containing poor weld not retubing, but carry out welding and reprocess, will from weld first and heat-treated significantly different: (1) welding point place is through a heat treatment, again heat-treat and easily cause mechanical performance not meet standard-required, the reduction of such as strength of parent; (2) reprocess as butt welded seam carries out local, the weld seam at the place of reprocessing is in strong situation of restraining, and the probability that crackle occurs increases.Therefore, shipowner/owner is generally unwilling to accept this type of pipeline and reprocesses, reprocessing particularly after heat treatment, this means to need the additional more multi-control condition of the welding equipment of such pipeline, such as: suppose shipowner/owner allow heat treatment before reprocess, then need to carry out a gamma flaw detection before heat treatment to find in advance to weld the defect caused, for offshore engineering, this means that the Yin Jiama increased in the radius 50 meters of at least one times detects a flaw the overall downtime caused.
In sum, this type of pipeline in use must ensure absolute security, must meet the strictest quality requirement again, very high to welding process control overflow.But due to the requirement that demand fulfillment is more, this is just to welding the construction technology of reprocessing, and welding process quality control and evaluation proposes very high requirement, and this type of engineering practice successful experience lacks very much at present.
Summary of the invention
The present invention proposes a kind of high pressure line weld defect processing method, is unsuitable for carrying out welding the problem of reprocessing to solve when weld defect appears in prior art high pressure line.
For achieving the above object, the present invention proposes a kind of pipeline weld defect processing method, comprises the following steps:
Step 1: butt welded seam carries out nondestructive inspection;
Step 2: be the inner or defect of outer surface of weld seam or the defect of the root of weld according to the position of defect, determines the form of the groove formed;
Step 3: welding method is determined in the formation according to formed groove, and butt welded seam welds;
Step 4: after having welded, Welded Joints carries out brave after-baking.
Wherein, the chemical composition of described piping material by weight (%) count: C :≤0.35, Mn :≤1.05, P :≤0.04, S :≤0.04, Si :≤1.00, Cr :≤2.75, Mo :≤1.50, V≤0.30, under quality adjustment condition, mechanical property requirements is: tensile strength: >=620MPa, yield strength: >=415MPa, percentage elongation: >=17%, the contraction percentage of area: >=35%, hardness (HRC) :≤22, impact flexibility: minimum 42J at-30 DEG C.
Wherein, the chemical composition of described weld material by weight (%) count: C :≤0.35, Mn :≤1.05, P :≤0.04, S :≤0.04, Si :≤1.00, Cr :≤2.75, Mo :≤1.50, V≤0.30, under quality adjustment condition, mechanical property requirements is: tensile strength: >=620MPa, yield strength: >=415MPa, percentage elongation: >=17%, the contraction percentage of area: >=35%, hardness (HRC) :≤22, impact flexibility: minimum 42J at-30 DEG C.
Wherein, in step 1, the gamma rays form be combined with magnetic powder inspection of detecting a flaw is taked to carry out nondestructive inspection.
Wherein, in step 2, if defective locations is the defect of weld seam inside or outer surface, outside defect two ends, at least 10mm carries out the removal of defect, and root radius R is not less than 5mm, and bevel angle is 45-60 °, weld seam starting point possesses the gradient of 1:3, and length is not less than 50mm; If defective locations is the defect of the root of weld, groove root gap is 1-4mm, and root root face is 0-1mm, and groove width is 0.7-1.5 pipeline wall thickness doubly.
Wherein, the defect for the root of weld uses machined means to be cut by weld bond, then pipeline is taken off aft-loaded airfoil groove face, and the undersize that defect causes after removing uses manual argon arc welding to carry out built-up welding.
Wherein, in step 3, the groove that the defect for weld seam inside or outer surface is formed, adopts SMAW to weld; For the groove that the defect of the root of weld is formed, adopt GTAW+SMAW combination to weld, first use GTAW bottoming, then use GTAW to be filled to 6-8mm thickness, re-use SMAW and fill and capping.
Wherein, in step 3, main welding parameters during welding is: stick electrode arc welding: electric current 110-150A, voltage 19-25V, heat input 10-30KJ/cm; SMAW during capping: electric current 110-130A, voltage 19-25V, heat input 10-30KJ/cm; Manual argon arc arc welding: electric current 130-150A, voltage 10-15V, argon flow amount 10-15/min, heat input 11-23KJ/cm.
Wherein, in step 3, weld width is no more than 2.5 times of welding rod, and bead thickness is no more than 4mm.
Wherein, in step 3, the preheat temperature of welding and interlayer temperature are not less than 150 DEG C, and not higher than 250 DEG C.
Wherein, described preheating adopts electrical heating method, and being heated to temperature is 250-300 DEG C, is then cooled to the preheat temperature of process stipulation.
Wherein, in step 4, after welding, use heat-preservation cotton to cover welding point and make it to slowly cool to room temperature, then post weld heat treatment is carried out to the welding point completed.
Wherein, in step 4, the temperature of post weld heat treatment is between 630-670 DEG C, and temperature retention time is 1-3 hour.
Wherein, in step 3, the welding material selected is the welding material that former welding procedure uses.
And, the present invention proposes and obtain pipeline after above-mentioned pipeline weld defect disposal methods.
And, the present invention proposes the rig comprising above-mentioned pipeline.
And, the present invention proposes the application of above-mentioned rig in deep water/ultra-deep-water ocean.
Invention effect:
The weld defect adopting method of the present invention can confront on material carries out directly welding and reprocesses, a solder yield of 100% can be pursued, reduce process control requirements, and the flaw detection work before heat treatment can be exempted, and retubing is avoided after generation defect, this will reduce production cost greatly.
Accompanying drawing explanation
Fig. 1 a to Fig. 1 b is that in the present invention, non-root defect forms the bevel angle of groove and root radius requires schematic diagram after removing;
Fig. 1 c is the groove weld starting point slope requirement that in the present invention, non-root defect is formed after removing and the schematic diagram reprocessing weld seam length requirement;
Fig. 2 is that the groove type formed after root defect removes reparation in the present invention requires schematic diagram;
Fig. 3 a is the position view that defect occurs in the embodiment of the present invention 1;
Fig. 3 b reprocesses groove schematic diagram in the embodiment of the present invention 1;
Fig. 4 is the schematic diagram using 3 road welding beads to carry out capping in the embodiment of the present invention 1;
Fig. 5 is brave after-baking curve map in the embodiment of the present invention 1;
Fig. 6 is that groove schematic diagram is reprocessed in the welding of the embodiment of the present invention 2;
Fig. 7 is the flow chart of steps of method for processing seam of the present invention.
Wherein, Reference numeral:
10: former layer 20: overlay cladding
Detailed description of the invention
The invention provides a kind of pipeline weld defect processing method, the method is applicable to Repair when weld seam appears in pipeline, be particularly useful for the weld defect process of high pressure line, be specially adapted to the weld defect process of marine rig high pressure line, be particularly applicable to the weld defect process of the rig high pressure line of ocean deepwater/ultra-deep-water environment.The overall reworking plan of its weld defect for high strength/superhigh intensity pipeline, its welding point mechanical performance formed meets the requirement of all industry standards and leaves certain margin of safety, and has good operability in welding procedure process.
Wherein, unified definition and sorting technique be there is no for high strength/superhigh intensity both at home and abroad, generally take to divide according to intensity and divide according to strengthening mechanism.Divide by intensity and can be divided into high-strength steel and super-high strength steel: 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. by yield strength divide: high-strength steel: YS >=210MPa, super-high strength steel: YS > 550MP, institute uses steel strength within the scope of superhigh intensity, but be also applicable to high strength steel pipe (in partial specification minimum intensity requirement lower than this limit).
And define different for the definition various countries of high pressure and super-pressure pipeline: just like giving a definition in international process pipelines standard A SME B31.3: This Chapter pertains to piping designatedby the owner as being in High Pressure Fluid Service.Its requirementsare to be applied in full to piping so designated.High pressure isconsidered herein to be pressure in excess of that allowed by the ASMEB16.5 Class 2500 rating for the specified design temperature and materialgroup.However, there are no specified pressure limitations for theapplication of these rules. that is, namely high pressure line is may be defined as in the situation downforce of conveying innocuous fluid medium at more than 20Mpa under normal temperature.In China special equipment specification TSG D3001, for industrial pipeline, as long as namely any fluid is defined as highest level more than 10Mpa.
The present invention is by the following technical solutions:
The present invention proposes a kind of weld defect processing method of pipeline, especially processing method, the Rework Technics of the weld defect of the super high tensile pipeline that deep water/ultra-deep-water marine rig uses is applicable to, Fig. 7 is the flow chart of steps of method for processing seam of the present invention, and as shown in Figure 7, this technique comprises:
Step 1: butt welded seam carries out nondestructive inspection;
Step 2: be the inner or defect of outer surface of weld seam or the defect of the root of weld according to the position of defect, determines the form of the groove formed;
Step 3: welding method is determined in the formation according to formed groove, and butt welded seam welds;
Step 4: after having welded, Welded Joints carries out brave after-baking.
Specifically:
The piping material that need carry out reprocessing operation has following characteristics: chemical composition ranges 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 property requirements is: 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, impact flexibility peak demand: at-30 DEG C, in fact this is a higher requirement to minimum 42J(, is applicable to comparatively harsh marine site, such as Norway marine site; If lower requirement can reach too, specifically determine according to design conditions).For the above requirement of established weld seam also demand fulfillment.Meanwhile, due to such pipeline welding technique, the mother metal at welding point place and weld seam are through once meeting the heat treatment that Technology for Heating Processing requires.Wherein, HR is Rockwell hardness, and HRC is the hardness adopting 150Kg load and diamond cone injector to try to achieve, for the material that hardness is very high.Such as: hardened steel etc. its measuring method is, under the plus load of regulation, steel ball or diamond penetrator are vertically pressed into the surface of waiting to try material, 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 scleroscopic dial plate, can directly read.HRC is used to describe more brief and more professional.
Before reprocessing, in step 1, carry out effective nondestructive inspection, generally take the gamma rays form be combined with magnetic powder inspection of detecting a flaw to carry out, to determine the position of defect, scope and kind accurately, and before guaranteeing to reprocess, defect is removed completely.
In step 2, groove type: according to the position of defect, the following two kinds groove may be formed: 1, the defect of weld seam inside or outer surface, for this kind of defect, the groove type formed is: outside defect two ends, at least 10mm carries out the removal of defect, root radius R is not less than 5mm (as Fig. 1 a and Fig. 1 b), bevel angle α be 45-60 ° (as Fig. 1 a) or 45-55 ° (as Fig. 1 b).Weld seam starting point should possess the gradient that a:b is 1:3, and length a1 is not less than 50mm (as Fig. 1 c).2, the defect of the root of weld, for this kind of defect, as shown in Figure 2, the groove type formed is: do not limit bevel angle, but require that groove root gap a3 is 1-4mm, root root face a4 is 0-1mm, groove width a2 is 0.7-1.5 pipeline wall thickness a5 doubly.
Wherein, machined means can be used to be cut by weld bond for root defect, then pipe fitting be taken off aft-loaded airfoil groove face.The undersize that defect causes after removing uses manual argon arc welding to carry out built-up welding, and built-up welding thickness should at least exceed target thickness 3mm, then uses polishing to wait machined means groove face to be machined to the size of requirement.
And, in step 3, the welding method selected is determined according to formed groove: the groove 1 formed for the first defect, manual electric arc welding (SMAW) is selected to weld, for the groove 2 that the second defect is formed, GTAW+SMAW is selected to combine: first to use argon arc welding (GTAW) bottoming, then, use GTAW to be filled to 6-8mm thickness, re-use SMAW and fill and capping.
Wherein, the welding material selected is the welding material that former welding procedure uses, the welding rod that preferential use diameter is less.Weld width is no more than 2.5 times of welding rod, and bead thickness is no more than 4mm.The welding bead of capping layer is arranged and should be guaranteed to weld at least three road weld seams, and should there be one temper bead/ annealing bead centre.
Wherein, in step 3, main welding parameters during welding is as follows: stick electrode arc welding: electric current 110-150A, voltage 19-25V, heat input 10-30KJ/cm; SMAW during capping: electric current 110-130A, voltage 19-25V, heat input 10-30KJ/cm.Manual argon arc arc welding: electric current 130-150A, voltage 10-15V, argon flow amount 10-15/min, heat input 11-23KJ/cm.
Wherein, in welding, adopt following preheat temperature and interlayer temperature: temperature is not less than 150 ° of C, and not higher than 250 ° of C, along with preheat temperature should be increased to minimum 230 ° of C by increase when 40mm (such as, wall thickness) of wall thickness or the enhancing of restraining.Preheating adopts electrical heating method, and being heated to temperature is 250-300 DEG C, is then cooled to the preheat temperature of process stipulation.The width of heating tape is with counterpart center line for benchmark, and both sides are respectively not less than 3 times of wall thickness, and are not less than 100mm.
Wherein, in step 4, after welding, use heat-preservation cotton to cover welding point and make it to slowly cool to room temperature.Then the timely welding point to completing carries out post weld heat treatment.Post weld heat treatment temperature 630-670 DEG C, temperature retention time is 1-3 hour.
Further, preferably, adopt rope form heater and reasonable Arrangement heating region, the parts thermal treatment zone that wall thickness is larger should suitably expand, and also should ensure that thin wall component can not be overheated simultaneously.
This repair method be applicable to welding point heat-treat first before with heat treatment after reprocessing, but to the welding point after Overheating Treatment, only allow to carry out 1 time.
And, the present invention proposes and obtain pipeline after above-mentioned pipeline weld defect disposal methods.
And, the present invention proposes the rig comprising above-mentioned pipeline.
And, the present invention proposes the application of above-mentioned rig in deep water/ultra-deep-water ocean.
Embodiment
Below in conjunction with example with put into practice case and be described in further details the present invention, so that those skilled in the art understand the present invention better, so its not limiting the scope of the invention.
Embodiment 1:
The material that the high-pressure slurry pipeline that a certain ultra-deep-water semisubmersible drilling platform uses is ASTM A519Gr.4130, supply of material state is generally modified, and the chemical composition ranges that ASTM specification specifies and mechanical property requirements are in table 1 and table 2.
The chemical composition ranges (%) 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 Offshore Platform Construction code requirement, need additional impact toughness reguirements, because built platform will be on active service in region, the Norway North Sea, the requirement of demand fulfillment NORSOK specification, thus additional impact flexibility require to be decided to be-30 DEG C at minimum 42J.According to NACE specification, in material hardness, additional requirement is the highest 22HR.
Initial weld seam welding material selects OK Tigrod 13.26 and the Filarc118 of her Sa (Esab) of Sweden, and corresponding AWS (AWS) grade is respectively: the welding protection gas of ER80S-Ni1 and E11018-M, GTAW adopts straight argon.When butt welded seam defect is repaired, still use this two kinds of welding materials.Its chemical composition and mechanical performance are as 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 |
| Filarc118 | 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 |
This defect is removed to the groove of rear formation as shown in Fig. 3 a and Fig. 3 b: after the pipeline welding of 141.3mm × 31.75mm completes, find that existence exceeds standard pore 100, this degree of depth a6 exceeding standard pore 100 be about 15mm (as Fig. 3 a), the groove root radius R formed is not less than 5mm, bevel angle α is 45-60 °, and groove root degree of depth a7 is about 20mm (as shown in Figure 3 b).
Main welding parameters during welding is as follows:
Table 5 welding parameter
Use higher preheating and interlayer temperature in welding, temperature is not less than 150 DEG C, along with preheat temperature should be increased to minimum 230 DEG C by the increase of wall thickness or contained enhancing.
In 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 de-slag, that reduces convex weld sweeps mill amount, better controls the break time of lower floor's welding, reduces the generation of weld defect.Receipts arc place should be polished into gentle slope shape by each layer (road) weld seam before joint, and ignite in the front end of joint area electric arc, pulls back to joint and carry out normal weld, during capping, speed of welding is slightly slow, make teeter arc manipulation, welding rod is transported to groove limit fast and has a break, and makes smooth welding joint.Weld width is no more than 2.5 times of welding rod, and bead thickness is no more than 4mm.The welding bead of capping layer is arranged and should be guaranteed to weld at least three road weld seams, and should there be one temper bead/ annealing bead centre.Fig. 4 is the situation that use 3 road welding bead carries out capping, and the order of its final pass as shown in Figure 4.Further, polishing is used to remove reinforcement after welding.
After the welding is completed, post weld heat treatment is carried out as early as possible.Such as, be the pipeline of 139.7mm × 18.26mm to specification, post weld heat treatment temperature 650 ± 10 DEG C, temperature retention time about 90 minutes.Wherein, T1 is not controlled ramp, and T2 is controlled ramp, and T3 is insulation, and T4 is controlled cooling, and T5 is Temperature fall.Heat treatment cycle curve as shown in Figure 5.
Embodiment 2:
Pipeline material, welding material, welding is identical with embodiment 1 with heat treatment situation first
Fig. 6 is that groove schematic diagram is reprocessed in the welding of the embodiment of the present invention 2, as shown in Figure 6, after the pipeline welding of 141.3mm × 31.75mm completes, finds root cob webbing, has been above standard and has required that the degree of depth is about 15mm.After removing this defect, groove root gap a3 is 1-4mm, and root root face a4 is 0-1mm, bevel angle α is 50 °, and in the enterprising windrow weldering of the former layer in weld seam side 10, then overlay cladding 20 is polished off about 2mm, and guarantee that assembling rear groove meets regulation requirement:
During built-up welding, parameter is as shown in table 6:
Table 6 built-up welding welding parameter
Main welding parameters when welding and heat treatment is as shown in table 7, and other process control points for attention are identical with embodiment 1.
Table 7 welding parameter
Beneficial effect of the present invention:
The process of groove type when reprocessing welding, makes it according to actual conditions sweetly disposition, better can ensure its operability.
The welding material that wlding directly selects former welding bead to use, optimizes welding condition, particularly adds the requirement to pass sequence, and crackle when can reduce welding is to a certain extent inclined to and has the possibility of lifting sub performance.
The heat treatment parameter optimized, can ensure that the mechanical property of the welding point after standing secondary heat treatment still can meet design requirement, this comprise affected by heat treatment region mother metal and draw together the intensity of metal structure, impact flexibility, hardness entirety ensure.Such as: for the pipeline of ASTM A519Gr.4130 material, can ensure that the mechanical performance of welding point reaches following standard: tensile strength: >=620MPa, yield strength: >=415MPa, impact flexibility: minimum 42J at-30 DEG C, hardness (HRC) :≤22.
The welding scheme of this type of pipeline routine is reprocessed after not allowing heat treatment, need to carry out a gamma rays flaw detection before heat treatment to find that welding the defect caused also reprocesses before heat treatment, after adopting this scheme, then can cancel the flaw detection of the gamma before heat treatment, shorten the production cycle, and decrease the impact on other specialties near working region simultaneously.
For the weld defect found after heat treatment, direct use welding butt welded seam defect is reprocessed, instead of retubing, becomes and only carries out local from cutting away problem pipeline section and welding twice weld bond and reprocess, greatly reduce material cost and human cost, and decrease coverage.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claims in the present invention.
Claims (5)
1. a pipeline weld defect processing method, is characterized in that, comprises the following steps:
Step 1: butt welded seam carries out nondestructive inspection, takes the gamma rays form be combined with magnetic powder inspection of detecting a flaw to carry out nondestructive inspection;
Step 2: be the inner or defect of outer surface of weld seam or the defect of the root of weld according to defect, determine the form of the groove formed, in step 2, if defect is the defect of weld seam inside or outer surface, outside defect two ends, at least 10mm carries out the removal of defect, and root radius R is not less than 5mm, and bevel angle is 45-60 °, weld seam starting point possesses the gradient of 1:3, and length is not less than 50mm; If defect is the defect of the root of weld, the defect for the root of weld uses machined means to be cut by weld bond, then finished edge face, and groove root gap is 1-4mm, and root root face is 0-1mm, and groove width is 0.7-1.5 pipeline wall thickness doubly;
Step 3: welding method is determined in the formation according to formed groove, butt welded seam welds, for the groove that the defect of weld seam inside or outer surface is formed, SMAW is adopted to weld, main welding parameters during welding is: stick electrode arc welding: electric current 110-150A, voltage 19-25V, heat input 10-30KJ/cm; SMAW during capping: electric current 110-130A, voltage 19-25V, heat input 10-30KJ/cm; For the groove that the defect of the root of weld is formed, GTAW+SMAW combination is adopted to weld, first GTAW bottoming is used, then GTAW is used to be filled to 6-8mm thickness, re-use SMAW to fill and capping, main welding parameters during welding is: manual argon arc arc welding bottoming: electric current 135-145A, voltage 11-13V, argon flow amount 10-25L/min, heat input 11-23KJ/cm; Manual electric arc welding is filled: electric current 110-130A, voltage 20-25V, heat input 10-25KJ/cm; Manual electric arc welding capping: electric current 110-120A, voltage 20-25V, heat input 10-20KJ/cm; Weld width is no more than 2.5 times of welding rod, and bead thickness is no more than 4mm; Preheat temperature and the interlayer temperature of welding are not less than 150 DEG C, and not higher than 250 DEG C;
Step 4: after having welded, Welded Joints carries out post weld heat treatment, and the temperature of post weld heat treatment is between 630-640 DEG C, and temperature retention time is 1-3 hour.
2. pipeline weld defect processing method according to claim 1, it is characterized in that, the chemical composition of described piping material is by weight percentage: 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 property requirements is: tensile strength: >=620MPa, yield strength: >=415MPa, percentage elongation: >=17%, the contraction percentage of area: >=35%, hardness HRC :≤22, impact flexibility: minimum 42J at-30 DEG C.
3. pipeline weld defect processing method according to claim 1, is characterized in that, the welding material that wlding directly selects former welding bead to use.
4. pipeline weld defect processing method according to claim 1, is characterized in that, described preheating adopts electrical heating method, and being heated to temperature is 250-300 DEG C, is then cooled to the preheat temperature of process stipulation.
5. pipeline weld defect processing method according to claim 1, is characterized in that, in step 4, after welding, uses heat-preservation cotton to cover welding point and makes it to slowly cool to room temperature, then carry out post weld heat treatment to the welding point completed.
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