CN102554402A - Welding and heat treatment processes of large-diameter and thick-wall nuclear process pipes - Google Patents
Welding and heat treatment processes of large-diameter and thick-wall nuclear process pipes Download PDFInfo
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- CN102554402A CN102554402A CN2012100142253A CN201210014225A CN102554402A CN 102554402 A CN102554402 A CN 102554402A CN 2012100142253 A CN2012100142253 A CN 2012100142253A CN 201210014225 A CN201210014225 A CN 201210014225A CN 102554402 A CN102554402 A CN 102554402A
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Abstract
The invention discloses welding and heat treatment processes of large-diameter and thick-wall nuclear process pipes, which are suitable for welding and heat treatment of large-diameter and thick-wall pipes. The pipes welded by the welding and heat treatment processes are steady and reliable in the quality of welding lines, and can completely meet the quality requirement of nuclear technology.
Description
Technical field
Invention relates to a kind of welding and Technology for Heating Processing, is meant process pipe welding of the thick tube wall nuclear of a kind of big caliber and Technology for Heating Processing especially.
Background technology
Welding and heat treatment technics difficulty for the nuclear process pipe is very big at present, and quality requirement is high, and the technical difficulty of the nuclear process pipe of the thick tube wall of particularly big caliber is bigger, complex process, and the hot environment operation, welding is worked continuously, and the work period is long.These characteristics make conventional welding method and technology can't accomplish normal welding job.
Summary of the invention
Inventing technical problem to be solved is: process pipe welding of the thick tube wall nuclear of a kind of big caliber and Technology for Heating Processing are provided, and this welding and Technology for Heating Processing weldquality when handling the thick tube wall of big caliber is reliable and stable.
For solving the problems of the technologies described above, the technical scheme of invention is: process pipe welding of the thick tube wall nuclear of a kind of big caliber and Technology for Heating Processing may further comprise the steps:
Prepare before A, the weldering, comprise step by step following:
A1) confirm welding and heat treated operative norm;
A2) whether specification, the trade mark, wlding specification, the trade mark and the gas of inspection tubing meet standard;
A3) selection tool;
A4) acceptance of instrument;
A5) to the otch end face finished edge of two tubing of need welding, this groove is the U-shaped groove, and the angle of said groove face and vertical direction is 20 ± 2.5 °, and the arc radius of said groove root is 5mm, and root face is 1-2mm;
A6) foreign material in the groove face surfaces externally and internally 20mm scope are removed totally, exposed metallic luster;
B, that two tubing that will weld are organized is right, comprises step by step following: b1) affirmation group is to solid identical with the tubing material or the identical group of piece of frock jig, point of usefulness; B2) two tubing horizontal group are right, group is 1-4mm and even to the gap, and group is following to the weld bond inside and outside wall permissible variation of accomplishing:
Inside pipe wall permissible variation: wall thickness/20+1mm, it is 3mm that maximum can not surpass;
Pipe outer wall permissible variation: wall thickness/10+2mm, maximum can not surpass 8mm;
C, two tubing are carried out the manual argon arc welding tack welding, adopt solid packaged joining of point, comprise step by step following:
C1) whole piece girth joint circumference evenly is divided into 12 five equilibriums, 3,6,9,12 positions of hour position are not provided with a little solid piece, and eight solid pieces of point are arranged in 1,2,4,5,7,8,10,11 positions;
C2) will put solid piece and put between the groove, the solid angle welding full weld of point, the solid angle welding single face length of point greater than 20mm, thickness greater than 3mm;
C3) quality of inspection tack welding;
D, weld preheating comprise step by step following;
D1) two thermocouples are separately fixed at 6 of tubing and 12 positions, the thermocouple measurement end distance is from weld groove outward flange 30mm-50mm;
D2) two thermocouple outerwrap heat tapes, the thermocouple measurement end distance is from heat tape edge 0-5mm, and outward by the heat-preservation cotton Apparatus for strapping packages, 100mm-140mm is the weld seam and the zone of splashing between the two thermocouple measurement ends, carries out shutoff with the heat-preservation cotton band;
D3) energising preheating is regularly measured the groove face temperature with digital display point temperature meter, and the preheat temperature of control groove face is 125 ℃ of-250 ℃ of scopes;
D4) after preheating meets the requirements, the heat-preservation cotton band is removed;
E, GTAW backing welding adopt the segmentation symmetrical welding;
E1) confirm segmentation symmetry welding sequence and starting the arc position: first bond pads order; According to hour position 6 → 5,11 → 12; 3 → 2,8 → 9; 6 → 7,1 → 12; 4 → 3,9 → 10; Order welding; Wherein 6 → 5,11 → 12 is a pair of balanced welding section, and 3 → 2,8 → 9 is a pair of balanced welding section, and 6 → 7,1 → 12 is a pair of balanced welding section, and 4 → 3,9 → 10 is a pair of balanced welding section; With the welding direction is direction of advance; Weld at 6 → 5,6 → 7,3 → 2,9 → 10 o'clock respectively from 6,6,3,9 the preceding 10mm starting the arc, 6 points that turn back respectively then, 6 points, 3 points, 9 back 10-20mm play weldering; Weld the 20mm starting the arc before the solid piece of the point of 11,4,1,8 positions respectively in 11 → 12,4 → 3,1 → 12,8 → 9 o'clock, go back to the solid piece of point of 11,4,1,8 positions then respectively before the 10mm position play weldering, after having crossed 12,3,12,9 positions, receive arc;
E2) second bond pads order: according to 7 → 8,2 → 1; 5 → 4,10 → 11 order welding; Wherein 5 → 4,10 → 11 is a balanced welding section, and 7 → 8,2 → 1 is a balanced welding section; When welding each weldering section; The solid piece polishing of point that earlier will the section of weldering two ends is removed; The crator polishing is to concordant with groove face; Then from this weldering section 10mm position starting the arc before initial hour, turn back backward then and to rear weldering section and welding line joint, play weldering, and then receive arc after running to the place ahead weldering section and welding line joint forward;
E3) backing run welds 2 layers altogether, and every layer 1 road, welding wire are selected φ 1.6 or φ 2.4 for use, linear welding bead, and wide 3 times of being no more than gage of wire of welding torch pendulum, less than 3mm, interlayer temperature is 125 ℃ of-250 ℃ of scopes with respect to the pipe material inner wall reinforcement for back of weld;
Capping is filled in F, manual metal-arc welding: adopt linear welding bead, balanced welding, and wide 3 times of being no more than gage of wire of welding torch pendulum, interlayer temperature is at 125 ℃-250 ℃; Welding rod is selected φ 3.2 or φ 4.0 for use, and when using φ 3.2 welding rods, every layer thickness is at 4-5mm, and when using φ 4.0 welding rods, every layer thickness is at 5-8mm; The face of weld reinforcement is less than 2.5mm;
G, after heat comprise step by step following;
G1) after welding is accomplished, with the heat-preservation cotton band weld seam is packed tightly and tighten immediately;
G2) carry out after-baking according to the technological procedure defined, temperature retention time was at least 1 hour, and monitoring in real time;
G3) temperature retention time is stopped power supply after arriving regulation, after the cooling, removes that heat-preservation cotton, insulation are worn, heat tape and thermocouple;
The all defectives in weld seam both sides are removed in H, polishing, guarantee that weld seam must seamlessly transit with the tubing outer peripheral face;
I, the heat treatment that eliminates stress comprise step by step following;
I1) with two thermocouples corresponding different colours of difference and numbering;
I2) two thermocouples are separately fixed at 6 of tubing outer peripheral faces and 12 positions, the thermocouple measurement end places the face of weld center;
I3) be that center line is wrapped in outside the weld seam with the weld seam with heat tape, the outside is used the heat-preservation cotton Apparatus for strapping packages again, and the heating overall width is greater than 50mm;
I4) energising heating, heat treatment temperature is 595-625 ℃, temperature retention time 90 ± 10min, firing rate and cooling velocity are no more than 110 ℃/h;
I5) temperature according to thermocouple assay generates temperature-time curve synchronously through recorder;
J, removing face of weld oxide skin and floating ash.
As a kind of preferred scheme, it is identical with backing welding that welding sequence, the starting the arc receipts arc position of capping are filled in the step F manual metal-arc welding.
After having adopted technique scheme, the effect of invention is: in this welding and the Technology for Heating Processing, tubing is divided into 12 sections; Adopt GTAW backing welding and manual metal-arc welding to fill capping, and balanced welding, therefore; Can divide into groups during welding to accomplish, weld every section after replaceable personnel, guarantee continuous sequence; Also reduced welding deformation and crackle tendency when reducing welder's labour intensity; Guaranteed welding quality, and, made weldquality meet the requirement of nuclear process pipe nondestructive testing and each item physical and chemical inspection index through reasonably controlling welding and heat treatment process parameter.
Description of drawings
Below in conjunction with accompanying drawing and embodiment invention is further specified.
Fig. 1 be inventive embodiments the tubing group to after the localized axial structure cutaway view at groove place;
Fig. 2 is the localized axial structure cutaway view at the groove place after the tubing of inventive embodiments welds;
Fig. 3 is that the tubing weld seam circumference of inventive embodiments evenly divides sketch map;
Fig. 4 is the tubing tack welding sketch map of inventive embodiments;
Fig. 5 is the sketch map of the weld preheating of inventive embodiments;
Fig. 6 is the Technology for Heating Processing thermocouple layout drawing of inventive embodiments;
In the accompanying drawing: 1. tubing; 101. root face; 2. groove; 3. backing welding; 4. filling capping; 5. solid piece; 6. solid angle welding; 7. thermocouple; 8. heat tape; 9. heat-preservation cotton; 10. heat-preservation cotton band; 11. weld seam.
The specific embodiment
Through specific embodiment invention is done further to describe in detail below.
The thick tube wall of big caliber alleged among the present invention generally is meant diameter greater than 114mm, and wall thickness is the tubing 1 of 20-46mm.
Process pipe welding of the thick tube wall nuclear of a kind of big caliber and Technology for Heating Processing may further comprise the steps:
Prepare before A, the weldering, comprise step by step following:
A1) confirm welding and heat treated operative norm; Operative norm is in the present embodiment: " design of presurized water reactor nuclear island plant equipment and construction rule " (RCC-M2000, RCC-M2002 addendum);
A2) whether specification, the trade mark, wlding specification, the trade mark and the gas of inspection tubing 1 meet standard; Tubing 1 with P280GH φ 812.8 * 46mm in the present embodiment is example, and table 1 has write down the technological parameter of this specification tubing 1;
| Type | The trade mark | Specification | Operative norm |
| The carbon steel covered electrode | E7018S | φ3.2 | AWS?A5.1 |
| The carbon steel solid core welding wire | ER?70S-3 | φ1.6 | AWS?A5.18 |
| Argon gas | Ar | 99.99％ | GB/T10624-1995 |
Table 1
A3) selection tool; Need with welding equipment have: inversion direct current argon arc/manual arc welder WS-400E or Arc Welding Power of the same type, argon gas decompression table, Welding rod drying box, welding rod heat-preserving container, Equipment for Heating Processing TCS-1 or equipment of the same type, thermocouple 7, some temperature meter and groove 2 process equipments, harmless and physical and chemical inspection equipment etc.
Require ammeter, voltmeter and argon gas decompression table and the process demarcation of above-mentioned relevant device of inversion direct current argon arc/manual arc welder WS-400E, and in demarcating the term of validity.
Need with worker's facility mainly contain: electric angle grinder, wire brush, half-round file, flashlight, weld seam 11 inspection chis, acetone, cotton yarn and appliances for labor protection, heat-preservation cotton 9, heat-preservation cotton band 10.
A4) acceptance of instrument; Whether the inspection purity of argon is 99.99%, and whether the welding wire surface that the inspection argon-arc torch is used cleans, and whether the acceptance of the welding wire physical and chemical parameter that tubing 1, argon-arc torch are used is qualified;
A5) to the otch end face finished edge 2 of two tubing 1 of need welding, as shown in Figure 1, this groove 2 is a U-shaped groove 2, and the angle of said groove face and vertical direction is 20 ± 2.5 °, and the arc radius of said groove 2 roots is 5mm, and root face 101 is 1-2mm;
A6) foreign material such as the oil of groove face surfaces externally and internally 20mm scope, rust, oxide skin are removed clean foreign material and remove totally, expose metallic luster, available in case of necessity acetone is cleaned, and exposes metallic luster;
B, 1 group of two tubing that will weld are right, as shown in Figure 1, comprise step by step following: b1) affirmation group is to the solid identical or identical group with tubing 1 material of piece 5 of frock jig, point of usefulness, to prevent contact corrosion; B2) two tubing, 1 horizontal group is right, group is 1-4mm and even to the gap, and group is following to the weld bond inside and outside wall permissible variation of accomplishing:
Inside pipe wall permissible variation: wall thickness/20+1mm, it is 3mm that maximum can not surpass;
Pipe outer wall permissible variation: wall thickness/10+2mm, maximum can not surpass 8mm;
C, two tubing 1 are carried out the manual argon arc welding tack welding, adopt a solid piece 5 assemblings of point, comprise step by step following:
C1) whole piece girth joint 11 circumference evenly are divided into 12 five equilibriums, as shown in Figure 3,3,6,9,12 positions of hour position are not provided with the solid piece 5 of a little solid 5, eight points of piece and are arranged in 1,2,4,5,7,8,10,11 positions;
C2) as shown in Figure 4, will put solid piece 5 and put between the groove 2, solid angle welding 6 full welds of point, the solid angle welding 6 single face length of point greater than 20mm, thickness greater than 3mm;
C3) quality of inspection tack welding, needs off quality polish off, and are solid again;
D, weld preheating, as shown in Figure 5, the purpose of weld preheating is in order to reduce welding stress, reduces weld seam 11 and cracks tendency, pipeline section one end shutoff produces thermograde to avoid draught; Comprise step by step following;
D1) two thermocouples 7 are separately fixed at 16 of tubing and 12 positions, thermocouple 7 measuring junctions are apart from weld seam 11 grooves 2 outward flange 30mm-50mm;
D2) two thermocouples, 7 outerwrap heat tapes 8, thermocouple 7 measuring junctions are apart from heat tape 8 edge 0-5mm, and outward by heat-preservation cotton 9 Apparatus for strapping packages, 100mm-140mm is the weld seam 11 and the zone of splashing between two thermocouples, 7 measuring junctions, carries out shutoff with heat-preservation cotton band 10;
D3) energising preheating is regularly measured the groove face temperature with digital display point temperature meter, and the preheat temperature of control groove face is 125 ℃ of-250 ℃ of scopes; The preheating console temperature displayed value measured temperature values than groove face usually is high.This is because digital display is put groove face temperature metal below heat tape 8 of warm instrumentation amount to pass over, so the temperature of the heat tape 8 following heated temperature of metal thermocouple 7 measurements is just put the groove face temperature of warm instrumentation amount greater than digital display.
D4) after preheating meets the requirements, the heat-preservation cotton band is removed, can be carried out next step welding job.
E, GTAW backing welding 3 adopt the segmentation symmetrical welding; The welder divides 3 groups, and every group 2 people enters the court one group, symmetrical welding at every turn.
E1) confirm segmentation symmetry welding sequence and starting the arc position: first bond pads order; According to hour position 6 → 5,11 → 12; 3 → 2,8 → 9; 6 → 7,1 → 12; 4 → 3,9 → 10; Order welding; Wherein 6 → 5,11 → 12 is a pair of balanced welding section, and 3 → 2,8 → 9 is a pair of balanced welding section, and 6 → 7,1 → 12 is a pair of balanced welding section, and 4 → 3,9 → 10 is a pair of balanced welding section; With the welding direction is direction of advance; Weld at 6 → 5,6 → 7,3 → 2,9 → 10 o'clock respectively from 6,6,3,9 the preceding 10mm starting the arc, 6 points that turn back respectively then, 6 points, 3 points, 9 back 10-20mm play weldering; Weld at 11 → 12,4 → 3,1 → 12,8 → 9 o'clock respectively from the solid piece 5 preceding 20mm starting the arc of the point of 11,4,1,8 positions; Go back to the solid piece of the point 5 preceding 10mm positions of 11,4,1,8 positions then respectively and play weldering, after having crossed 12,3,12,9 positions, receive arc; The front and back of hour position of the present invention all are move towards to be provided with along preset welding, and as when welding 6 → 5 these weldering sections, and when welding 6 → 7 these weldering sections, then 5 o'clock after 6 o'clock before 6 o'clock in 7 o'clock after 6 o'clock in 7 o'clock before 6 o'clock in 5 o'clock;
E2) second bond pads order: according to 7 → 8,2 → 1; 5 → 4,10 → 11 order welding; Wherein 5 → 4,10 → 11 is a balanced welding section, and 7 → 8,2 → 1 is a balanced welding section; When welding each weldering section; The solid piece 5 of point that earlier will the section of weldering two ends is removed polishing; Then from this weldering section 10mm position starting the arc before initial hour, turn back backward then and to rear weldering section and weld seam 11 joints, play weldering, and then receive arc after running to the place ahead weldering section and weld seam 11 joints forward; So just the weldering Duan Jun with front and back connects into girth joint;
E3) backing run welds 2 layers altogether, and every layer 1 road, welding wire are selected φ 1.6 or φ 2.4 for use, linear welding bead, and wide 3 times of being no more than gage of wire of welding torch pendulum, less than 3mm, interlayer temperature is 125 ℃ of-250 ℃ of scopes with respect to tubing 1 inwall reinforcement for back of weld; Reduce welding stress like this, narrow with respect to weave bead weld seam 11, the speed of travel is fast, and the heat input is little, and thermal stress is little, is out of shape little.Less than 3mm, interlayer temperature is 125 ℃ of-250 ℃ of scopes with respect to tubing 1 inwall reinforcement at weld seam 11 back sides; Quality inspection personnel examines the welding deformation in the welding process, if axis is not straight, can by the welder in welding process, take rational welding anti-distortion principle to proofread and correct.The quality of prime coat weld seam 11 plays crucial effects to the quality of whole piece weld seam 11.After every section weld seam 11 is accomplished, must check the root Forming Quality, joint quality is crossed high defective for interior undercut, indent, overlap, the inner reinforcement found, and polishing is in time removed.During the welding of backing welding 3 seam, after the intact end weldering of the every assembly welding section, change one group and enter the court and take over welding.
Capping 4 is filled in F, manual metal-arc welding, and is as shown in Figure 2: adopt linear welding bead, balanced welding, it is identical with backing welding 3 that welding sequence, the starting the arc receipts arc position of capping 4 are filled in manual metal-arc welding.Wide 3 times of being no more than gage of wire of welding torch pendulum, interlayer temperature is at 125 ℃-250 ℃; Welding rod is selected φ 3.2 or φ 4.0 for use, and when using φ 3.2 welding rods, every layer thickness is at 4-5mm, and when using φ 4.0 welding rods, every layer thickness is at 5-8mm; Weld seam 11 surperficial reinforcements are less than 2.5mm; Multi-pass welding interlayer joint will stagger.Reply per pass weld seam 11 carries out visual examination in the welding process, and the discovery defective is in time removed.Polishing during removal of defects care should be used to carry out, overheated to avoid occurring.The welding bead surface should be continuous, and thickness is even, and with the surperficial even transition of contiguous welding bead.Welding operation should be avoided under the harsh climate condition, carrying out.Environment temperature remains on+more than 5 ℃.The workplace is provided with screen, to reduce the convection current wind that influences arc stability.Welding rod should carry out oven dry insulation on request to be handled, to avoid producing in the welding process defective such as pore.
So far, table 2 is backing welding 3 and the process parameter table of filling capping 4:
Table 2
G, after heat, after-baking help the hydrogen diffusion of deposited metal, reduce the tendency that produces cold crack because of the hydrogen gathering.In addition,, guarantee that weld seam 11 temperature data acquisitions are accurate, also need thermocouple 7 and heat tape 8 be arranged again, so after heat is the weld seam 11 heat treatment necessary step before that eliminates stress in order to control weld seam 11 heat treatment step that eliminates stress accurately; Comprise step by step following;
G1) after welding is accomplished, with heat-preservation cotton band 10 weld seam 11 is packed tightly and tighten immediately;
G2) carry out after-baking according to the technological procedure defined, temperature retention time was at least 1 hour, and monitoring in real time;
G3) temperature retention time is stopped power supply after arriving regulation, after the cooling, removes that heat-preservation cotton 9, insulation are worn, heat tape 8 and thermocouple 7; The weld seam 11 of after-baking can not be placed on cross-ventilated place, to avoid producing disadvantageous thermograde.
The all defectives in weld seam 11 both sides are removed in H, polishing, remove visible undercut, splash, too high reinforcement etc., and assurance weld seam 11 must seamlessly transit with tubing 1 outer peripheral face;
I, the heat treatment that eliminates stress comprise step by step following;
I1) with two thermocouples, 7 corresponding different colours of difference and numberings;
I2) two thermocouples 7 are separately fixed at 6 and 12 positions of tubing 1 outer peripheral face, thermocouple 7 measuring junctions place weld seam 11 outer surface centers, and are as shown in Figure 6, so that accurately measure the temperature of weld seam 11;
I3) be that center line is wrapped in outside the weld seam 11 with heat tape 8 with weld seam 11, the outside is used heat-preservation cotton 9 Apparatus for strapping packages again, and the heating overall width is greater than 50mm; The wrapping of insulation material and fixing after, environment should have certain heat-dissipating space all around, is beneficial to Homogeneouslly-radiating, can better control the shape of temperature lowering curve like this.
I4) energising heating, heat treatment temperature is 595-625 ℃, temperature retention time 90 ± 10min, in order to prevent distortion and thermal stress, firing rate and cooling velocity should be enough slow, and firing rate and cooling velocity are no more than 110 ℃/h;
I5) temperature according to thermocouple 7 tests generates temperature-time curve synchronously through recorder;
Specification of heat treatment technological parameter such as table 3 eliminate stress.
Table 3
During the heat treatment that eliminates stress, strict control firing rate, temperature, temperature retention time and cooling velocity.Equipment for Heating Processing uses normal graph paper to the continuously automatic record of temperature time curve.The heat treatment recording curve must be continuous, and uniformly, demonstration must not go offline.After heat treatment is accomplished, on curve map, mark but information such as speed, temperature, temperature retention time, heat treatment report number and corresponding curve color and paper feed speed of heats cold, issue the heat treatment report simultaneously by the heat treatment operation personnel.
J, removing weld seam 11 surface scales and floating ash.
Claims (2)
1. thick tube wall nuclear process pipe welding of big caliber and Technology for Heating Processing may further comprise the steps:
Prepare before A, the weldering, comprise step by step following:
A1) confirm welding and heat treated operative norm;
A2) whether specification, the trade mark, wlding specification, the trade mark and the gas of inspection tubing meet standard;
A3) selection tool;
A4) acceptance of instrument;
A5) to the otch end face finished edge of two tubing of need welding, this groove is the U-shaped groove, and the angle of said groove face and vertical direction is 20 ± 2.5 °, and the arc radius of said groove root is 5mm, and root face is 1-2mm;
A6) foreign material in the groove face surfaces externally and internally 20mm scope are removed totally, exposed metallic luster;
B, that two tubing that will weld are organized is right, comprises step by step following: b1) affirmation group is to solid identical with the tubing material or the identical group of piece of frock jig, point of usefulness; B2) two tubing horizontal group are right, group is 1-4mm and even to the gap, and group is following to the weld bond inside and outside wall permissible variation of accomplishing:
Inside pipe wall permissible variation: wall thickness/20+1mm, it is 3mm that maximum can not surpass;
Pipe outer wall permissible variation: wall thickness/10+2mm, maximum can not surpass 8mm;
C, two tubing are carried out the manual argon arc welding tack welding, adopt solid packaged joining of point, comprise step by step following:
C1) whole piece girth joint circumference evenly is divided into 12 five equilibriums, 3,6,9,12 positions of hour position are not provided with a little solid piece, and eight solid pieces of point are arranged in 1,2,4,5,7,8,10,11 positions;
C2) will put solid piece and put between the groove, the solid angle welding full weld of point, the solid angle welding single face length of point greater than 20mm, thickness greater than 3mm;
C3) quality of inspection tack welding;
D, weld preheating comprise step by step following;
D1) two thermocouples are separately fixed at 6 of tubing and 12 positions, the thermocouple measurement end distance is from weld groove outward flange 30mm-50mm;
D2) two thermocouple outerwrap heat tapes, the thermocouple measurement end distance is from heat tape edge 0-5mm, and outward by the heat-preservation cotton Apparatus for strapping packages, 100mm-140mm is the weld seam and the zone of splashing between the two thermocouple measurement ends, carries out shutoff with the heat-preservation cotton band;
D3) energising preheating is regularly measured the groove face temperature with digital display point temperature meter, and the preheat temperature of control groove face is 125 ℃ of-250 ℃ of scopes;
D4) after preheating meets the requirements, the heat-preservation cotton band is removed;
E, GTAW backing welding adopt the segmentation symmetrical welding;
E1) confirm segmentation symmetry welding sequence and starting the arc position: first bond pads order; According to hour position 6 → 5,11 → 12; 3 → 2,8 → 9; 6 → 7,1 → 12; 4 → 3,9 → 10; Order welding; Wherein 6 → 5,11 → 12 is a pair of balanced welding section, and 3 → 2,8 → 9 is a pair of balanced welding section, and 6 → 7,1 → 12 is a pair of balanced welding section, and 4 → 3,9 → 10 is a pair of balanced welding section; With the welding direction is direction of advance; Weld at 6 → 5,6 → 7,3 → 2,9 → 10 o'clock respectively from 6,6,3,9 the preceding 10mm starting the arc, 6 points that turn back respectively then, 6 points, 3 points, 9 back 10-20mm play weldering; Weld the 20mm starting the arc before the solid piece of the point of 11,4,1,8 positions respectively in 11 → 12,4 → 3,1 → 12,8 → 9 o'clock, go back to the solid piece of point of 11,4,1,8 positions then respectively before the 10mm position play weldering, after having crossed 12,3,12,9 positions, receive arc;
E2) second bond pads order: according to 7 → 8,2 → 1; 5 → 4,10 → 11 order welding; Wherein 5 → 4,10 → 11 is a balanced welding section, and 7 → 8,2 → 1 is a balanced welding section; When welding each weldering section; The solid piece of point that earlier will the section of weldering two ends is removed polishing; The solid piece polishing of point that earlier will the section of weldering two ends is removed, and the crator polishing is to concordant with groove face, the 10mm position starting the arc before this weldering initial hour of section then; Turn back backward then and to rear weldering section and welding line joint, play weldering, and then receive arc after running to the place ahead weldering section and welding line joint forward;
E3) backing run welds 2 layers altogether, and every layer 1 road, welding wire are selected φ 1.6 or φ 2.4 for use, linear welding bead, and wide 3 times of being no more than gage of wire of welding torch pendulum, less than 3mm, interlayer temperature is 125 ℃ of-250 ℃ of scopes with respect to the pipe material inner wall reinforcement for back of weld;
Capping is filled in F, manual metal-arc welding: adopt linear welding bead, balanced welding, and wide 3 times of being no more than gage of wire of welding torch pendulum, interlayer temperature is at 125 ℃-250 ℃; Welding rod is selected φ 3.2 or φ 4.0 for use, and when using φ 3.2 welding rods, every layer thickness is at 4-5mm, and when using φ 4.0 welding rods, every layer thickness is at 5-8mm; The face of weld reinforcement is less than 2.5mm;
G, after heat comprise step by step following;
G1) after welding is accomplished, with the heat-preservation cotton band weld seam is packed tightly and tighten immediately;
G2) carry out after-baking according to the technological procedure defined, temperature retention time was at least 1 hour, and monitoring in real time;
G3) temperature retention time is stopped power supply after arriving regulation, after the cooling, removes that heat-preservation cotton, insulation are worn, heat tape and thermocouple;
The all defectives in weld seam both sides are removed in H, polishing, guarantee that weld seam must seamlessly transit with the tubing outer peripheral face;
I, the heat treatment that eliminates stress comprise step by step following;
I1) with two thermocouples corresponding different colours of difference and numbering;
I2) two thermocouples are separately fixed at 6 of tubing outer peripheral faces and 12 positions, the thermocouple measurement end places the face of weld center;
I3) be that center line is wrapped in outside the weld seam with the weld seam with heat tape, the outside is used the heat-preservation cotton Apparatus for strapping packages again, and the heating overall width is greater than 50mm;
I4) energising heating, heat treatment temperature is 595-625 ℃, temperature retention time 90 ± 10min, firing rate and cooling velocity are no more than 110 ℃/h;
I5) temperature according to thermocouple assay generates temperature-time curve synchronously through recorder;
J, removing face of weld oxide skin and floating ash.
2. process pipe welding of the thick tube wall nuclear of big caliber as claimed in claim 1 and Technology for Heating Processing, it is identical with backing welding to it is characterized in that the welding sequence of capping is filled in the step F manual metal-arc welding, the arc position is received in the starting the arc.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100142253A CN102554402B (en) | 2012-01-18 | 2012-01-18 | Welding and heat treatment processes of large-diameter and thick-wall nuclear process pipes |
Applications Claiming Priority (1)
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| CN113909806A (en) * | 2021-09-23 | 2022-01-11 | 浙江蓝能燃气设备有限公司 | Preparation method of large-diameter stainless steel welded liner carbon fiber fully-wound bottle type container |
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