CN107999937A - A kind of long distance pipeline full-automatic welding process - Google Patents
A kind of long distance pipeline full-automatic welding process Download PDFInfo
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- CN107999937A CN107999937A CN201711400525.4A CN201711400525A CN107999937A CN 107999937 A CN107999937 A CN 107999937A CN 201711400525 A CN201711400525 A CN 201711400525A CN 107999937 A CN107999937 A CN 107999937A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
Abstract
The invention discloses a kind of full-automatic welding process of long distance pipeline, welding preparation includes carrying out retaining wall on slope to welded pipe deferent mouth end face, the parameter of groove is outer groove angle a and b angles are 5 ° 8 °, outer groove interior angle angle c is 90 °, inner slope bicker d angles are 1.5 ° of 75 scholar, width of root face H is 1.27mm scholar 0.15mm, and internal groove depth h is 1.27mm scholar 0.15mm；Alignment clearance K is 0mm 0.5mm；The welding process includes interior root bead, hot weld, filling weldering and cosmetic welding；Hot weld, filling weldering and cosmetic welding use welding wire 1.0mm; polarity is straight polarity direct current; welding current 230A~255A; weldingvoltage 25~27; wire feed rate 9.0m/min~11.0m/min; speed of welding 60cm/min~70cm/min, swings laterally amplitude 1.6cm~2.1cm, the ratio of protective gas is 50%Ar and 50%CO2.The welding procedure of the present invention meets real work needs, and welding efficiency and weldquality are significantly improved, and labor strength substantially reduces.
Description
Technical field
The present invention relates to long distance pipeline welding technology field, more particularly to a kind of long distance pipeline full-automatic welding process.
Background technology
In the prior art, welded in pipe-line construction based on the construction of traditional-handwork soldering method, the welding method is due to welding
Speed is slow, and welding quality is affected by human factors larger.In the early 1980s, the domestic manual downward welding for having introduced America and Europe
Skill, and most of construction enterprises are progressively generalized to, quality steps a stage.Weld seam linear meter statistical quality, X-ray were pressed at that time
For first-time qualification rate up to more than 95%, which instead of traditional-handwork soldering method.In the 1990s, China is from the U.S.
Flux-cored wire semi-automatic welding equipment and technique are introduced, with its solder yield and high production efficiency the advantages that is defeated in China head
It is used widely in pipe-line construction.
In the latter stage nineties, petrochina has begun to the automatic welding of pipelines equipment of Introduced From Abroad, domestic by digesting and assimilating
Welding equipment producer developed portioned product, be applied in pipe-line construction, but its performance and efficiency and overseas high speed
There are larger gap for automatic welding device.
The content of the invention
The object of the present invention is to provide a kind of full-automatic welding process, can meet real work needs, welding efficiency and weldering
Connect quality to be significantly improved, labor strength substantially reduces.
To achieve the above object, the present invention provides a kind of full-automatic welding process, welding preparation to be included to welded pipe line
Mouth of pipe end face carries out retaining wall on slope, and the parameter of groove is upper outer groove angle a and b angles are 5 ° -8 °, upper outer change groove interior angle c angles
It is 90 ° to spend c, and lower inner slope bicker d angles are 1.5 ° of 75 scholar, and width of root face H is 1.27mm scholar 0.15mm, and lower internal groove depth h is
1.27mm scholar 0.15mm, the length L on lower groove side to change groove is 5.08mm；The distance between two root face of groove alignment clearance K
For 0mm-0.5mm；The welding process includes interior root bead, hot weld, filling weldering and cosmetic welding；The interior root bead stage uses welding wire
0.9mm, polarity are straight polarity direct current, welding current 250A~280A, weldingvoltage 25~27, wire feed rate 10.0m/min~
13.5m/min, speed of welding 95cm/min~110cm/min, swing laterally amplitude 0.5cm~0.7cm, the ratio of protective gas
For 80%Ar and 20%CO2.；Hot weld, filling weldering and cosmetic welding use welding wire 1.0mm, the filling stage polarity be direct current just
Connect, welding current 230A~255A, weldingvoltage 25~27, wire feed rate 9.0m/min~11.0m/min, speed of welding
60cm/min~70cm/min, swings laterally amplitude 1.6cm~2.1cm, the ratio of protective gas is 50%Ar and 50%CO2.
Wherein, the welding wire includes following chemical composition：C content is that 0.07-0.12wt%, Si content are 0.740.40-
It is≤0.007wt%, Cr content that 0.70wt%, Mn content, which are 1.530.8-1.6wt%, S content for≤0.008wt%, P content,
It is that 0.87-1.1wt%, Mo content are 0.00825-0.055wt% for 0.030-0.8wt%, Ni content；The mechanics of the welding wire
Performance parameter is：Tensile strength (MPa) >=be more than or equal to 550, yield strength (MPa) >=be more than or equal to 420.
Wherein, the hot weld stage gage of wire 1.0mm, polarity are straight polarity direct current, and welding current 250A~280A, is welded
Voltage 25V~27V, wire feed rate 10.0m/min~13.5m/min, speed of welding 95cm/min~110cm/min, laterally puts
Dynamic amplitude 0.5cm~0.7cm, the ratio of protective gas is 8050%Ar and 2050%CO2.
Wherein, the cosmetic welding stage gage of wire 1.0mm, polarity are straight polarity direct current, and welding current 200A~220A, is welded
Voltage 25V~27V, wire feed rate 8.0m/min~9.0m/min, speed of welding 60cm/min~75cm/min are met, is swung laterally
Amplitude 1.6cm~1.8cm, the ratio of protective gas is 80%Ar and 20%CO2.
Wherein, the filling layer weldering welding number of plies is n-layer, wherein, n is more than or equal to 3；The 1st layer of welding filling is descending
Mouth base to the complete rear upper connector position to be filled between becoming groove bottom of outer groove hot weld；The 2nd layer of welding filling is filled to welding
The n-th -2 layers are filled upwards from welding filling first layer successively；(n-1)th layer of welding filling and the outermost of welding filling n-th layer welding
The air line distance G of the first bevelled edge of millet cake distance is 0.5mm-2.mm；Groove side is straight on welding the n-th apogee distance of filling
Linear distance J is 1mm-2.0mm；(n-1)th layer of the welding filling among the welding filling n-th layer with overlapping a part.
Wherein, butt welding pipe nozzle is needed to be preheated before a welding process, the preheating temperature control of the welding mouth of pipe is in 80-
100℃。
Wherein, in welding process, the stem elongation degree of welding wire is 10-15mm.
Wherein, mouth of pipe group to unfitness of butt joint≤thickness of pipe wall/8 and is not more than 1mm.
Wherein, full-automatic welding process according to claim 2, it is characterised in that the welding wire includes followingization
Study point：C content is that 0.07wt%, Si content are that 0.74wt%, Mn content are that 1.53wt%, S content are≤0.008wt%, P
Content is that 0.030wt%, Ni content are that 0.87wt%, Mo content are 0.008wt% for≤0.007wt%, Cr content；The weldering
Silk mechanical property parameters be：Tensile strength (MPa) >=550, yield strength (MPa) >=420.
Wherein, welding preparation further includes：Pipeline mouth of pipe end face is grouped and cleaned；The groove processed is carried out clear
It is clean；Welded pipe line is routinely checked；Internal welding machine, outer welding machine used in welding are routinely detected；To welding
Technological parameter typing is simultaneously preserved to controller.
As above, the present invention has following technique effect compared with prior art：
Full automatic welding welding procedure using the present invention carries out pipeline welding, its technological merit is：
1) all position automatic welding technique, is improved the stability of weldquality, and full process automatization operation, avoids
Influence of fluctuations of the traditional-handwork weldering welding to weldquality.
2) because of the raising of welding parameter and the interference of the human factor avoided, speed of welding can be significantly improved, reduces behaviour
Make the labor intensity of worker, reduce needs of the enterprise to skilled work post operative skill, reduce construction cost.
3) welding protection gas uses argon gas and carbon dioxide, reduces to pollution of the welding process to environment and behaviour
Make the injury of the occupational healths such as personnel's pneumoconiosis.
Brief description of the drawings
Fig. 1 is the groove design diagram of the present invention；
Fig. 2 is the welding bead filling hierarchy chart of the present invention.Fig. 3 is the mother metal microscopic structure schematic diagram of the present invention.
Fig. 4 is the Microstructure of Weld Metal schematic diagram of the present invention；
Fig. 5 is the heat affected area design sketch of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention of greater clarity, with reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright scope.In addition, in the following description, the description to known features and technology is eliminated, to avoid this is unnecessarily obscured
The concept of invention.
Limited with reference to embodiment is further to the present invention.
Welding preparation work includes pipeline mouth of pipe end face being cleaned and being organized pair；The groove processed is cleaned；
Welded pipe line is routinely checked；Internal welding machine, outer welding machine used in welding are routinely detected；To welding procedure
Parameter typing is simultaneously preserved to controller, and retaining wall on slope is carried out to welded pipe deferent mouth end face.
Specifically, pipeline mouth of pipe end face being cleaned and being organized pair：First pipeline is cleared up before welding process, it is ensured that
No-sundries in pipe, the mouth of pipe is soldered surface should be uniform, smooth, should not have delamination, abrasion, iron rust, grease, paint etc. to influence pipeline
The other problems of welding quality.Mouth of pipe group is to unfitness of butt joint≤thickness of pipe wall/8 and is not more than 1mm.
As shown in Figure 1, retaining wall on slope is carried out to welded pipe deferent mouth end face：The parameter of finished edge is outer groove angle a and b
Angle is 5 ° -8 °, and outer groove interior angle angle is c90 °, and inner slope bicker angle d is 1.5 ° of 75 scholar, and width of root face H is 1.27mm scholar
0.15mm, internal groove depth h are 1.27mm scholar 0.15mm；Group is 0mm-0.5mm to gap K.Groove size had both ensured weld seam skill
The fusion ratio of art, and reduce weld seam filled gold category loading, speed of welding can be improved.
Welding process includes root bead, hot weld, filling weldering and cosmetic welding；Root bead refers in site welding that the mouth of pipe undertakes for first
The weld seam of connection；Hot weld, after the completion of root bead, it is desirable to which what is carried out immediately has the welding bead of rear heat and dehydrogenation effect；Filling weldering, it is main
If weld bond is metal filled, under conditions of weld bond mechanics is not influenced, it is desirable to charging efficiency and speed as soon as possible；Cosmetic welding,
Refer to one layer of layer of weld bond most surface, it is desirable to which beautiful appearance, uniformity is free of surface defects, with mother metal rounding off.The present invention
Middle root bead uses internal welding machine, and hot weld, filling weldering and cosmetic welding use outer welding machine, the internal welding machine used in welding procedure of the invention
Comprising 4 welding gun heads, every 2 pipette tips combine the welding for being respectively completed interior circumferential weld hemicycle week, so as to complete circumferential weld in whole
Welding process, therefore internal welding machine can complete pipeline root bead in a short time.Root bead speed is up to 25mm/s, far below craft
The down hill welding root bead time.Internal welding machine can more ensure the appearance forming of inner-walls of duct weld seam with welding than copper lining welding, to pipeline
Smooth long term running, reduce inner wall corrosion there is significantly effect.In welding, mother metal selects API 5L PSL2 L485M
Pipe line steel, caliber 813mm wall thickness 16mm.Its chemical composition and mechanical property are shown in Tables 1 and 2
1 L485M chemical compositions of table
2 L485M mechanical properties of table
The interior root bead stage uses welding wire0.9mm, polarity are straight polarity direct current, welding current 250A~280A, weldingvoltage
25V~27V, wire feed rate 10.0m/min~13.5m/min, speed of welding 95cm/min~110cm/min, swings laterally width
0.5cm~0.7cm is spent, the ratio of protective gas is 80%Ar and 20%CO2.；Hot weld, filling weldering and cosmetic welding use welding wire
1.0mm；The filling weldering stage polarity be straight polarity direct current, welding current 230A~255A, weldingvoltage 25V~27V, and wire feed is fast
9.0m/min~11.0m/min, speed of welding 60cm/min~70cm/min are spent, swings laterally amplitude 1.6cm~2.1cm, is protected
The ratio for protecting gas is 50%Ar and 50%CO2.The tensile strength and cold-bending property of protective gas ratio Welded Joints have one
Fixed influence, if argon content reduces, carbon dioxide content increase, the oxidisability enhancing of electric arc, causes Si, Mn content to drop
It is low, non-metallic inclusion is generated, matter weld seam impact toughness reduces.If CO2 ratios increase, welding penetration is in downhand welding position, vertical
Welding position, overhead welding position accordingly increase.In order to improve welding efficiency, avoid not melting in quick generation, thus root bead when welding, hot weld,
Cosmetic welding hybrid protection gas is using the ratio of (80%Ar+20%CO2), and filler pass is using (50%Ar+50%CO2) gaseous mixture
Body ratio.
Wherein, the welding wire includes following chemical composition：C content is that 0.07-0.12wt%, Si content are 0.740.40-
It is≤0.007wt%, Cr content that 0.70wt%, Mn content, which are 1.530.8-1.6wt%, S content for≤0.008wt%, P content,
It is that 0.87-1.1wt%, Mo content are 0.00825-0.055wt% for 0.030-0.8wt%, Ni content；The mechanics of the welding wire
Performance parameter is：Tensile strength (MPa) >=be more than or equal to 550, yield strength (MPa) >=be more than or equal to 420.
Optimal, full-automatic welding process according to claim 2, it is characterised in that the welding wire includes following
Chemical composition：C content be 0.07wt%, Si content be 0.74wt%, Mn content be 1.53wt%, S content for≤
0.008wt%, P content are that 0.030wt%, Ni content are that 0.87wt%, Mo content are for≤0.007wt%, Cr content
0.008wt%；The mechanical property parameters of the welding wire are：Tensile strength (MPa) >=550, yield strength (MPa) >=420.
Wherein, the root bead stage gage of wire 0.9mm, polarity are straight polarity direct current, and welding current 250A~280A, is welded
Voltage 25V~27V, wire feed rate 10.0m/min~13.5m/min, speed of welding 95cm/min~110cm/min, laterally puts
Dynamic amplitude 0.5cm~0.7cm, the ratio of protective gas is 80%Ar and 20%CO2.The root bead stage polarity for direct current just
Connect, welding current 250A~280A, weldingvoltage 25~27, wire feed rate 10.0m/min~13.5m/min, speed of welding
95cm/min~110cm/min, swings laterally amplitude 0.5cm~0.7cm, the ratio of protective gas is 80%Ar and 20%CO2.
Wherein, the hot weld stage gage of wire 1.0mm, polarity are straight polarity direct current, and welding current 250A~280A, is welded
Voltage 25V~27V, wire feed rate 10.0m/min~13.5m/min, speed of welding 95cm/min~110cm/min, laterally puts
Dynamic amplitude 0.5cm~0.7cm, the ratio of protective gas is 8050%Ar and 2050%CO2.The hot weld stage polarity is direct current
Just connect, welding current 250A~280A, weldingvoltage 25~27, wire feed rate 10.0m/min~13.5m/min, speed of welding
95cm/min~110cm/min, swings laterally amplitude 0.5cm~0.7cm, the ratio of protective gas is 80%Ar and 20%CO2.
Wherein, the cosmetic welding stage gage of wire 1.0mm, polarity are straight polarity direct current, and welding current 200A~220A, is welded
Voltage 25V~27V, wire feed rate 8.0m/min~9.0m/min, speed of welding 60cm/min~75cm/min are met, is swung laterally
Amplitude 1.6cm~1.8cm, the ratio of protective gas is 80%Ar and 20%CO2.The cosmetic welding stage polarity for direct current just
Connect, welding current 200A~220A, weldingvoltage 25~27, wire feed rate 8.0m/min~9.0m/min, speed of welding 60cm/
Min~75cm/min, swings laterally amplitude 1.6cm~1.8cm, the ratio of protective gas is 80%Ar and 20%CO2.
Wherein, the filling layer weldering welding number of plies is n-layer, wherein, n is more than or equal to 3；The 1st layer of welding filling is descending
Mouth base to the complete rear upper connector position to be filled between becoming groove bottom of outer groove hot weld；The 2nd layer of welding filling is filled to welding
The n-th -2 layers are filled upwards from welding filling first layer successively；(n-1)th layer of welding filling and the outermost of welding filling n-th layer welding
The air line distance G of the first bevelled edge of millet cake distance is 0.5mm-2.mm；Groove side is straight on welding the n-th apogee distance of filling
Linear distance J is 1mm-2.0mm；(n-1)th layer of the welding filling among the welding filling n-th layer with overlapping a part.Weldering
Filled layer welding n-layer is connect, wherein, n is more than or equal to 3；The 1st layer of welding filling is lower groove base between upper change groove bottom；
The n-th -2 layers to welding filling of the 2nd layer of welding filling is filled upwards from welding filling first layer successively；Welding filling (n-1)th layer and
The air line distance of outermost millet cake the first bevelled edge of distance of welding filling n-th layer welding is 0.5mm-2.mm；Welding filling n-th
The air line distance on groove side is 2.0mm on apogee distance；(n-1)th layer of the welding filling is filled in n-th layer with the welding
Between overlap a part.
Wherein, butt welding pipe nozzle is needed to be preheated before a welding process, the preheating temperature control of the welding mouth of pipe is reaching
80-100℃。
Wherein, in welding process, the stem elongation degree of welding wire is 10-15mm.
Wherein, for mouth of pipe group to unfitness of butt joint≤thickness of pipe wall/8 and when being not more than 1mm root beads, unfitness of butt joint is less than or equal to 3.0mm.
Wherein, welding preparation further includes：Pipeline mouth of pipe end face is grouped and cleaned；The groove processed is carried out clear
It is clean；Welded pipe line is routinely checked；Welding routinely detects used internal welding machine, outer welding machine；Butt welding
Connect technological parameter typing and preserve to controller.
Further, butt welding pipe nozzle is needed to be preheated before a welding process, welding mouth of pipe preheating temperature reaches 80-
100℃。
Further, in welding process, the stem elongation degree of welding wire is 10-15mm.
After full automatic welding welding procedure using the present invention carries out welding job, full automatic welding plumb joint sample is drawn
Stretch, bend, cutting, impact flexibility, hardness and microcosmic metallographic test result of the test statistics are shown in Table 3,4,5,6：
1) mechanical performance
The performances such as weld seam stretching, bending relatively fully meet requirement with mother metal
Table 3 is stretched, bent, cutting result of the test
2) impact flexibility
According to operating limit condition, -20 DEG C of impact tests are done to weld seam level heat affected area metal, experimental result is fully met
Requirement
4 impact ductility test result of table
3) hardness determination
General heat affected area hardness is higher in mother metal, weld seam, heat affected area, and the hardness wlding wlding of weld metal zone is related, together
Shi Douyu welding procedures have much relations, and the size of hardness depends on the metal group that the metal ingredient of each several part and postwelding are formed
Knit form.The qualified or not of welding procedure is examined at the same time, and specification provides highest hardness more than 265 (HV10), and measured value meets will
Ask.
5 Hardness results of table
4) microcosmic metallographic test result
As shown in Fig. 3, Fig. 4, Fig. 5, table 6, microcosmic metallographic test, amplification factor 500X, mother metal, weld seam, heat affected area
Microstructure grain size, non-metallic inclusion contrast：Mother metal, weld metal, heat affected area tissue are all ferrite, wherein welding
Area's ferrite journey dendritic state is stitched, meets formation basic theory of the molten pool metal under condition of fast cooling.At the same time from grain size size
Weld grain degree rank is judged close to mother metal, and heat affected area is slightly smaller, all meets not less than 8 grades standard requirements.
6 mother metal weld heat-affected zone grain size of table, banded structure, non-metallic inclusion result of the test
By welding procedure qualification test, standard requirement is reached using high-speed full-automatic welding equipment welded seam.Using
The full automatic welding welding procedure of the present invention carries out pipeline welding, its technological merit is：
1) ensure weld strength, reduce weld seam filled gold category loading, all position automatic welding technique, makes the steady of weldquality
Qualitative to be improved, full process automatization operation, avoids influence of fluctuations of the traditional-handwork weldering welding to weldquality.
2) while the raising because of welding parameter and the interference of the human factor avoided, speed of welding can be significantly improved, is subtracted
The labor intensity of few operator, reduces needs of the enterprise to skilled work post operative skill, reduces construction cost.
3) root bead, hot weld, cosmetic welding hybrid protection gas are using the ratio of (80%Ar+20%CO2), filler pass when welding
Using (50%Ar+50%CO2) ratio of gas mixture, tensile strength and cold-bending property are added, welding efficiency is improved, avoids
Argon gas and carbon dioxide are used in the not molten phenomenon welding protection gas of quick generation, is reduced to welding process to environment
The occupational health injury such as pollution and operating personnel's pneumoconiosis.
It should be appreciated that the above-mentioned embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, without being construed as limiting the invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole changes fallen into scope and border or this scope and the equivalents on border and repairing
Change example.
Claims (10)
1. a kind of long distance pipeline full-automatic welding process, it is characterised in that welding preparation include to welded pipe deferent mouth end face into
Row retaining wall on slope, the parameter of groove is upper outer groove angle a and b angles are 5 ° -8 °, upper outer change groove interior angle c angles c into 90 °, under
Inner slope bicker d angles are 1.5 ° of 75 scholar, and width of root face H is 1.27mm scholar 0.15mm, and lower internal groove depth h is 1.27mm scholar
0.15mm, the length L on lower groove side to change groove is 5.08mm；The distance between two root face of groove alignment clearance K is 0mm-
0.5mm；The welding process includes interior root bead, hot weld, filling weldering and cosmetic welding；The interior root bead stage uses welding wire
Polarity is straight polarity direct current, welding current 250A~280A, weldingvoltage 25V~27V, wire feed rate 10.0m/min~13.5m/
Min, speed of welding 95cm/min~110cm/min, swing laterally amplitude 0.5cm~0.7cm, the ratio of protective gas is 80%
Ar and 20%CO2.；Hot weld, filling weldering and cosmetic welding use welding wire 1.0mm；The filling weldering stage polarity is straight polarity direct current, weldering
Meet electric current 230A~255A, weldingvoltage 25V~27V, wire feed rate 9.0m/min~11.0m/min, speed of welding 60cm/
Min~70cm/min, swings laterally amplitude 1.6cm~2.1cm, the ratio of protective gas is 50%Ar and 50%CO2.
2. full-automatic welding process according to claim 1, it is characterised in that the welding wire includes following chemical composition：C
Content be 0.07-0.12wt%, Si content be 0.40-0.70wt%, Mn content be 0.8-1.6wt%, S content for≤
0.008wt%, P content are that 0.30-0.8wt%, Ni content are 0.8-1.1wt%, Mo content for≤0.007wt%, Cr content
For 0.25-0.055wt%；The mechanical property parameters of the welding wire are：Tensile strength (MPa) >=be equal to 550, yield strength
(MPa)≥420。
3. full-automatic welding process according to claim 1, it is characterised in that the hot weld gage of wire 1.0mm, polarity
For straight polarity direct current, welding current 250A~280A, weldingvoltage 25V~27V, wire feed rate 10.0m/min~13.5m/min,
Speed of welding 95cm/min~110cm/min, swings laterally amplitude 0.5cm~0.7cm, the ratio of protective gas for 50%Ar and
50%CO2.
4. full-automatic welding process according to claim 1, it is characterised in that the cosmetic welding gage of wire 1.0mm, pole
Property is straight polarity direct current, welding current 200A~220A, weldingvoltage 25V~27V, wire feed rate 8.0m/min~9.0m/min,
Speed of welding 60cm/min~75cm/min, swings laterally amplitude 1.6cm~1.8cm, the ratio of protective gas for 80%Ar and
20%CO2.
5. full-automatic welding process according to claim 1, it is characterised in that the filling weldering weldering welding number of plies is n-layer,
Wherein, n is more than or equal to 3；The 1st layer of welding filling is the outer complete rear joint of groove hot weld position to be filled；Weldering is arrived in the 2nd layer of welding filling
The n-th -2 layers of filling is connect to fill upwards from welding filling first layer successively；(n-1)th layer of welding filling and welding filling n-th layer welding
The air line distance G of outermost millet cake the first bevelled edge of distance be 0.5mm-2.mm；Groove on welding the n-th apogee distance of filling
The air line distance J on side is 1mm-2.0mm；(n-1)th layer of the welding filling among the welding filling n-th layer with overlapping one
Point.
6. full-automatic welding process according to claim 1, it is characterised in that need before a welding process to welded pipe
Mouth is preheated, and the preheating temperature control of the welding mouth of pipe is at 80-100 DEG C.
7. full-automatic welding process according to claim 1, it is characterised in that in welding process, the stem elongation of welding wire
Spend for 10-15mm.
8. full-automatic welding process according to claim 1, it is characterised in that welding preparation further includes：To the pipeline mouth of pipe
End face is grouped and cleans；The groove processed is cleaned；Welded pipe line is routinely checked；Welding is made
Internal welding machine, outer welding machine are routinely detected；To welding condition typing and preserve to controller.
9. full-automatic welding process according to claim 1, it is characterised in that mouth of pipe group to unfitness of butt joint≤thickness of pipe wall/8 and
No more than 1mm.
10. full-automatic welding process according to claim 2, it is characterised in that the welding wire includes following chemical composition：
C content is that 0.07wt%, Si content are that to be 1.53wt%, S content be 0.74wt%, Mn content for≤0.008wt%, P content
≤ 0.007wt%, Cr contents are that 0.030wt%, Ni content are that 0.87wt%, Mo content are 0.008wt%；The power of the welding wire
Learning performance parameter is：Tensile strength (MPa) >=550, yield strength (MPa) >=420.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711400525.4A CN107999937A (en) | 2017-12-22 | 2017-12-22 | A kind of long distance pipeline full-automatic welding process |
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| CN201711400525.4A CN107999937A (en) | 2017-12-22 | 2017-12-22 | A kind of long distance pipeline full-automatic welding process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112548276A (en) * | 2019-09-25 | 2021-03-26 | 中国石油化工股份有限公司 | Bimetal welding construction process method for overlaying prefabricated internal repaired mouth bimetal pipeline |
| CN113070549A (en) * | 2021-04-07 | 2021-07-06 | 南京奥特自动化有限公司 | Pipeline steel two-to-one butt weld pipeline deep melting high-speed welding process method |
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| CN112439981A (en) * | 2019-09-02 | 2021-03-05 | 中国石油化工股份有限公司 | Butt joint method of corrosion-resistant alloy prefabricated inner repaired mouth steel pipe |
| CN112439981B (en) * | 2019-09-02 | 2024-04-05 | 中国石油化工股份有限公司 | Butt joint method of corrosion-resistant alloy prefabricated inner joint coating steel pipe |
| CN112548276A (en) * | 2019-09-25 | 2021-03-26 | 中国石油化工股份有限公司 | Bimetal welding construction process method for overlaying prefabricated internal repaired mouth bimetal pipeline |
| CN113070549A (en) * | 2021-04-07 | 2021-07-06 | 南京奥特自动化有限公司 | Pipeline steel two-to-one butt weld pipeline deep melting high-speed welding process method |
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