CN105127557B - The medicine core gas shielded arc welding Rework Technics of marine engineering large thick steel plate under low temperature environment - Google Patents
The medicine core gas shielded arc welding Rework Technics of marine engineering large thick steel plate under low temperature environment Download PDFInfo
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- CN105127557B CN105127557B CN201510604316.6A CN201510604316A CN105127557B CN 105127557 B CN105127557 B CN 105127557B CN 201510604316 A CN201510604316 A CN 201510604316A CN 105127557 B CN105127557 B CN 105127557B
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- 238000003466 welding Methods 0.000 title claims abstract description 153
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 239000003814 drug Substances 0.000 title claims abstract description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 32
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 24
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 24
- 230000008439 repair process Effects 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims description 25
- 238000007689 inspection Methods 0.000 claims description 17
- 230000004907 flux Effects 0.000 claims description 12
- 229910000679 solder Inorganic materials 0.000 claims description 8
- 238000012958 reprocessing Methods 0.000 claims description 7
- 239000011229 interlayer Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- HSFWRNGVRCDJHI-UHFFFAOYSA-N Acetylene Chemical compound C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 3
- 230000003749 cleanliness Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 125000001153 fluoro group Chemical group F* 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 241000790917 Dioxys <bee> Species 0.000 claims 1
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000003032 molecular docking Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 210000001503 joint Anatomy 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000007778 shielded metal arc welding Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B23K9/18—Submerged-arc welding
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses the medicine core gas shielded arc welding Rework Technics of marine engineering large thick steel plate under low temperature environment; selection including welding method and welding material; selection and control of the welding process to each welding condition; the present invention is to use carbon dioxide gas arc welding bottoming, and the method for submerged-arc welding filling and capping carries out the prefabricated weld seam of weld seam；And the process of repair welding is carried out using carbon dioxide gas arc welding, by reasonably selecting welding material, the control welding parameter of science, solve the problem of weld seam cooling velocity is too fast to be deteriorated with the too high weld dimensions fracture toughness caused of temperature, reach that large thick steel plate exempts the requirement of post weld heat treatment butt joint toughness, it is successfully realized the process that service temperature exempts post weld heat treatment after the thick Z35 grades of marine engineering large thick steel plate repair weldings of D36 of 50 110mm of 0 DEG C and the above, simplify production procedure, shorten the production cycle, reduce cost.
Description
Technical field
The present invention relates to a kind of medicine core gas of marine engineering large thick steel plate under welding technology field, particularly low temperature environment
Protection weldering Rework Technics.
Background technology
With continuing to develop for marine petroleum development technology, the large-scale sea such as ocean platform, jacket, FPSO
Steel plate is more and more thicker used in foreign equipment, the requirement more and more higher to steel.Ocean platform is a kind of typical large-scale welding
Engineering structure, its complex structure, mother metal thickness is big, and welding requirements is high, and the most prefabricated welding of slab can use release to weld
The welding procedure being heat-treated afterwards is constructed, and greatly reducing production needs time and cost, still, in actual production process,
The appearance of the weld defect of big slab is inevitable, and these defects are being carried out during welding is reprocessed also usually to occur
The structure property deterioration of joint, thus produces high numerical value welding residual stress even defect, repair welding region is turned into whole
Position most weak in platform structure.Ensure the performance of repair welding joint, improve its low temperature fracture toughness, be to ensure that ocean is put down
The key factor of platform safe operation.Many enterprises employ SMAW (SMAW) when welding is reprocessed at this stage, and generally
Improve the toughness of big slab repair welding joint using the method for post weld heat treatment.But post weld heat treatment this process, no
Electrical heating cabinet, heating plate, heat-preservation cotton etc. are only needed, a large amount of manpower and materials, long in time limit, high cost, and high strength steel is expended and welds
The toughness value of heat treatment gained joint is mostly lower than untreated state afterwards.Therefore, for steel plate repair welding joint, more
It is by selecting appropriate welding material, welding method, and utilization CTOD verification experimental verification technologies, adjustment for the desirable method of economy
Optimizing welding process, to ensure the toughness of repair welding joint, to exempt post weld heat treatment process.This is to shortening ocean platform knot
The manufacturing cycle of structure, reduction manufacturing cost is significant.
The content of the invention
There is provided that present invention is generally directed to ocean engineering the invention aims to solve above-mentioned the deficiencies in the prior art
This problem of progress post weld heat treatment process is needed after large thick steel plate repair welding, a kind of use carbon dioxide has been invented and has protected
The method of shield weldering bottoming, submerged-arc welding filling and capping carries out the prefabricated weld seam of weld seam；And carried out using carbon dioxide gas arc welding
The process of repair welding, by reasonably selecting welding material, the control welding parameter of science has been finally reached big thick steel
Plate exempts the requirement of post weld heat treatment butt joint toughness, and the 50-110mm for being successfully realized service temperature in 0 DEG C and the above is thick
Exempt the process of post weld heat treatment after 712-2011DH36 grades of marine engineering large thick steel plate repair weldings of GB.
To achieve these goals, the medicine core gas of marine engineering large thick steel plate is protected under the low temperature environment designed by the present invention
Shield weldering Rework Technics, it is characterised in that：The Rework Technics comprise the following steps：The selection of first choice, welding method and welding material,
Prefabricated weld seam is carried out to DH36 mother metals：Carbon dioxide gas arc welding bottoming is selected by wlding experiment, welding is from medicine core weldering
Silk；Submerged-arc welding filling and capping, the low alloy steel welding wire of high cleanliness is selected by wlding welding wire, and adapted solder flux is and welding wire factory
The supporting fluorine alkaline type sintered flux that family is recommended；And carry out reprocessing weld seam：Rewelding is carried out using carbon dioxide gas arc welding
Connect, suitable flux-cored wire is selected by wlding testing sieve；
Secondly, the selection to welding condition, above-mentioned submerged-arc welding major parameter is set to：Gage of wire 4mm, electric current
560~630A, 27~33V of voltage, 397~648mm/min of speed of welding, thermal weld stress 1.0KJ/mm-3.0KJ/mm；It is above-mentioned
The welding parameter of carbon-dioxide arc welding be：Welding wire parameter 1.4mm, 180~230A of electric current, 23~27V of voltage, speed of welding
For 174~238mm/min, thermal weld stress 1.3J/mm~1.7J/mm；
In the control of the prefabricated weld seam welding process to temperature, preheating and interlayer temperature control exist：Prefabricated weld seam welding 110
DEG C -198 DEG C, the control to electric current, voltage and speed of welding makes heat input overall distribution between 1.0KJ/mm-3.0KJ/mm；
Cross and nondestructive inspection is carried out after 48 hours, the nondestructive inspection mode includes but is not limited to：Magnetic powder inspection and ultrasonic wave
Flaw detection；
Reprocess weld seam：Repair welding is carried out using carbon dioxide gas arc welding, its parameter is as follows：Welding wire parameter 1.4mm,
190~270A of electric current, 22~28V of voltage, speed of welding be 94~266mm/min, thermal weld stress 1.0J/mm~2.5J/mm,
Preheating and interlayer temperature control are at 115 DEG C -200 DEG C；
Using two kinds of welding groove forms during for repair welding：Using gouge double V-groove and using K-type groove form pair
Connect weldering；
Cross and carry out nondestructive inspection after 48 hours again, the nondestructive inspection mode includes but is not limited to：Magnetic powder inspection and super
Sonic flaw detection.
Preferably, described prefabricated and reprocess weld seam it uses steel board, steel plate ability thickness is 50-100mm, reprocesses thickness
For 50-100mm, most conventional ocean engineering slabs can be covered.
Preferably, it is described prefabricated and when reprocessing weld seam K-type groove, keep electric current, voltage and the welding in welding process
The uniformity of speed, to ensure the integrality of straight flange, is easy to producing for heat affected area CTOD samples.
Preferably, before its weldering of described prefabricated weld seam, solder flux will be dried about 2 hours at 300 DEG C -350 DEG C；Carbon dioxide
Gas shielded arc welding gas pushing quantity foot:15-25L/min.
Preferably, it is described prefabricated and to reprocess and should calculate heat input during weld seam, it is ensured that carbon dioxide gas arc welding
Heat input is in 1.3-1.7KJ/mm, and submerged-arc welding heat input is in 1.7-3.0KJ/mm.
Preferably, repair welding is carried out to DH36 mother metals, its CTOD test values of gained Seam and heat effected zone at 0 DEG C
≥0.15mm。
The medicine core gas shielded arc welding Rework Technics of marine engineering large thick steel plate under the low temperature environment that the present invention is obtained, with
Lower advantage：1st, repair welding method uses carbon dioxide gas arc welding, is applicable scene groove type and welding position is changeable
Situation, improves production efficiency, reduces labor intensity.
2nd, the CTOD experiments of 0 DEG C of temperature have been carried out, DH36 grades of steel plates of ocean engineering shipbuilding industry has been filled up and has reprocessed CTOD
The blank of experiment, the slab for the DH36 levels 50-110mm that more than 0 DEG C of environment temperature can be welded using this Rework Technics completely, and
Post weld heat treatment need not be carried out to weld seam, save manpower and materials, improve production efficiency, reduce cost, energy-conserving and environment-protective,
Obtain huge economic benefit and social benefit.
Brief description of the drawings
Fig. 1 is prefabricated weld seam " X " type groove schematic diagram of the invention；
Fig. 2 is that the present invention reprocesses weld seam " V " type groove schematic diagram；
Fig. 3 is that the present invention reprocesses weld seam " K " type groove schematic diagram；
In figure：Prefabricated weld seam 1,2.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Embodiment：
As shown in Figure 1 to Figure 3, the medicine core gas shielded arc welding of marine engineering large thick steel plate under the low temperature environment that the present invention is provided
Rework Technics, present invention use DH36 motherboard materials, steel plate thickness 100mm, it is that (K-type groove is 100mm, V to 100mm to reprocess thickness
Type groove depth is 75mm), it is the maximum actual plate thickness of off-the-shelf item, belongs to the welding of ultra-thick steel plates with reprocessing.The material has
The advantages of intensity height, good-toughness, good welding characteristic.Had a wide range of applications in industries such as ocean engineering, shipbuildings.Breadboard is pre-
Weld seam processed uses X-type groove type butt welding, and welding method is carbon dioxide gas arc welding bottoming, submerged-arc welding filling and lid
Face；Using two kinds of welding groove forms during repair welding：1st, Weld pipe mill is used for using gouge double V-groove (referring to Fig. 2)
CTOD is tested；2nd, the CTOD for being used for heat affected area using K-type groove form butt welding (referring to Fig. 3) is tested, and welding method is two
Carbon oxide gas protection weldering bottoming, filling and capping.Investigation and multiple preliminary test by technical staff to wlding business, it is first
Choosing, the selection of welding method and welding material, prefabricated weld seam：Carbon dioxide gas arc welding bottoming is selected by wlding experiment,
Flux-cored wire is selected in welding；Submerged-arc welding filling and capping, the low alloy steel welding wire of high cleanliness, adapted are selected by wlding welding wire
Solder flux is the supporting fluorine alkaline type sintered flux with welding wire manufacturer's recommended；Reprocess weld seam：Carried out using carbon dioxide gas arc welding
Repair welding, suitable flux-cored wire is selected by wlding testing sieve；It can be specifically prefabricated weld seam：It can select a diameter of
Φ 1.4mm flux-cored wire bottoming, flux-cored wire can select in the market flux-cored wire FORMULA XL-550 (H4), filling and
Capping can select diameter of phi 4.0mm welding wire for submerged-arc welding OE-SD3, and adapted solder flux is that adapted solder flux is fluorine alkaline type sintered flux.Return
Repair flux-cored wire FORMULA XL-550 (H4) of the welding from diameter of phi 1.4mm.
1. blanking
Corresponding steel plate is found by the material certificate Qu Liao factories of steel plate, test plate (panel), blanking are gone out according to manuscript cutting processing
Cheng Zhongyou third party classification society witnesses and beats steel seal.
2. a couple welder gives training.
Parameter in training process carefully will be adjusted and recorded；During (current/voltage/weldering speed/protective gas flow velocity)
Heat input must be calculated, has deviation to carry out linking up and adjusting parameter with welder in time.
The typical welding parameter of the submerged-arc welding of table 1
| Gage of wire (mm) | Electric current (A) | Voltage (V) | Speed of welding (mm/min) |
| 4.0 | 600 | 31 | 500 |
The typical welding parameter of the carbon dioxide gas arc welding of table 2 (reprocessing)
| Position | Gage of wire (mm) | Electric current (A) | Voltage (V) | Speed of welding (mm/min) |
| 2G | 1.4 | 280 | 29 | 380 |
| 3G | 1.4 | 240 | 25 | 200 |
Carried out after size qualification test specimen assembling (plus sufficiently thick horse plate and longer to draw 3. test plate (panel) is machined and examined
Arc plate), test plate (panel) fitted position is checked again for after assembling whether qualified.The long 140mm of run-on tab, thickness and mother metal uniform thickness.
After 4. test plate (panel) group is to getting well, notifies third party and carry out the original face of weld seam first welding, welding process should be controlled strictly
Below some:
A. before welding, notice that solder flux will be dried about 2 hours at 300 DEG C -350 DEG C；Carbon dioxide gas arc welding gas pushing quantity
Foot:15-25L/min.
B. preheating temperature and interlayer temperature, are not less than 110 DEG C, not higher than 200 DEG C, thermometric distance is outside 75mm；Disconnected postwelding,
Again the temperature preheated should be not less than formal welding preheating temperature.
C. heat input is calculated during at any time, it is ensured that its completely fuse, and will not heat input it is excessive, ensure two as far as possible
Carbon oxide gas protection welding heat input is in 1.3-1.7KJ/mm or so, and submerged-arc welding heat input is in 1.7-3.0KJ/mm or so.
D. note often being soldered together, be polished to no slag inclusion.
E. if accidents happened to pauses in the middle of, joint must be polished clean.
F. attention, which is measured, is soldered after carbon dioxide gas arc welding, the distance on layer surface and test plate (panel) surface.After thinking
Continuous back side root processing provides data foundation.
5. after the completion of one side is welded, until it is cooled to after 30 DEG C or so, lay down horse plate, gouge to certain depth, then
Polished, and groove is expanded into U-shaped or half U type, in gouge and polishing K-type groove, necessarily it is noted that keeping straight flange
Integrality.
6. carry out the welding in the second face.The second face is welded, it is similar that the item noted and the first face are welded.
7. after being soldered completely, nondestructive inspection is carried out after spending 48 hours, because thickness of slab is thicker, magnetic powder inspection and ultrasound are carried out
Wave inspection.
8. after nondestructive inspection is qualified, repair welding joint is prepared by modes such as cutting, gouge, polishings.
Group pair and the points for attention of welding are similar with original welding when reprocessing, but be also to pay special attention to it is following some:
Preheating temperature and interlayer temperature, are not less than 115 DEG C, not higher than 200 DEG C.
Carbon dioxide gas arc welding heat input tries one's best control in 1.0-2.5KJ/mm or so in rework process.
During the back chipping of back, it is ensured that remove root defect completely, back chipping depth is at least 5mm.
9. after the completion of repair welding, nondestructive inspection is carried out after spending 48 hours, flaw detection type is identical with former weld seam.
Test specimen is marked and cut after 10. flaw detection is qualified.
11. mechanical test test specimen is processed.
12. carry out mechanical property test and CTOD experiments.
Experimental result
1. common mechanics performance test results such as following table (table 3, table 4, table 5, table 6, table 7, table 8)
A.2G position
The 2G positions cross tensile test of table 3
| Specimen coding | Tensile strength (N/mm2) |
| QPJ13-034-T3 | 511 |
| QPJ13-034-T4 | 553 |
| QPJ13-034-T5 | 519 |
| QPJ13-034-T6 | 504 |
| QPJ13-034-T7 | 520 |
| QPJ13-034-T8 | 536 |
| QPJ13-034-T9 | 534 |
| QPJ13-034-T10 | 547 |
The full weld seam tension test in the 2G positions of table 4
| Specimen coding | Yield strength (N/mm2) | Tensile strength (N/mm2) | Elongation percentage % |
| QPJ13-034-T1 | 561 | 605 | 27.5 |
The 2G positions Charpy V test of table 5
Note：Specimen size：10mm*10mm*55mm test temperatures：-20℃
B.3G position
The 3G positions cross tensile test of table 6
| Specimen coding | Tensile strength (N/mm2) |
| QPJ13-035-T3 | 523 |
| QPJ13-035-T4 | 529 |
| QPJ13-035-T5 | 551 |
| QPJ13-035-T6 | 540 |
| QPJ13-035-T7 | 520 |
| QPJ13-035-T8 | 524 |
| QPJ13-035-T9 | 525 |
| QPJ13-035-T10 | 559 |
The full weld seam tension test in the 3G positions of table 7
| Specimen coding | Yield strength (N/mm2) | Tensile strength (N/mm2) | Elongation percentage % |
| QPJ13-035-T1 | 529 | 584 | 24.5 |
The 3G positions Charpy V test of table 8
Note：Specimen size：10mm*10mm*55mm test temperatures：-20℃
3.CTOD result of the tests such as following table (table 9, table 10)
The 2G positions CTOD of table 9 tests (0 DEG C)
The 3G positions CTOD of table 10 tests (0 DEG C)
Welding procedure qualification test or produced on-site construction are carried out according to implementation process of the present invention, you can be met release
The qualified welding point of post weld heat treatment requirement.
For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise,
Its framework form can be flexible and changeable, simply makes some simple deduction or replace, should all be considered as belonging to be carried by the present invention
The scope of patent protection that claims of friendship are determined.
Claims (6)
1. the medicine core gas shielded arc welding Rework Technics of marine engineering large thick steel plate under low temperature environment, it is characterised in that：This reprocesses work
Skill comprises the following steps：The selection of first choice, welding method and welding material, prefabricated weld seam is carried out to DH36 mother metals：From dioxy
Change carbon gas shielded arc welding bottoming, flux-cored wire is selected in welding；Submerged-arc welding filling and capping, welding wire select the low-alloy of high cleanliness
Steel welding wire, adapted solder flux is fluorine alkaline type sintered flux；And carry out reprocessing weld seam：Returned using carbon dioxide gas arc welding
Repair welding；
Secondly, the selection to welding condition, above-mentioned submerged-arc welding major parameter is set to：Gage of wire 4mm, electric current 560
~630A, 27~33V of voltage, 397~648mm/min of speed of welding, thermal weld stress 1.0KJ/mm-3.0KJ/mm；
The welding parameter of above-mentioned carbon-dioxide arc welding is：Welding wire parameter 1.4mm, 180~230A of electric current, 23~27V of voltage,
Speed of welding is 174~238mm/min, thermal weld stress 1.3KJ/mm~1.7KJ/mm；
In the control of the prefabricated weld seam welding process to temperature, preheating and interlayer temperature control exist：Prefabricated 110 DEG C of weld seam welding-
198 DEG C, the control to electric current, voltage and speed of welding makes heat input overall distribution between 1.0KJ/mm-3.0KJ/mm；
Cross and nondestructive inspection is carried out after 48 hours, the nondestructive inspection mode includes but is not limited to：Magnetic powder inspection and ultrasonic examination；
Reprocess weld seam：Repair welding is carried out using carbon dioxide gas arc welding, its parameter is as follows：Welding wire parameter 1.4mm, electric current
190~270A, 22~28V of voltage, speed of welding be 94~266mm/min, thermal weld stress 1.0KJ/mm~2.5KJ/mm, in advance
Heat and interlayer temperature control are at 115 DEG C -200 DEG C；
Using two kinds of welding groove forms during for repair welding：Using gouge double V-groove and using the docking of K-type groove form
Weldering；
Cross and carry out nondestructive inspection after 48 hours again, the nondestructive inspection mode includes but is not limited to：Magnetic powder inspection and ultrasonic wave
Flaw detection；
Described is prefabricated consistent with speed of welding with electric current when reprocessing weld seam K-type groove, kept in welding process, voltage
Property, to ensure the integrality of straight flange, it is easy to producing for heat affected area CTOD samples.
2. the medicine core gas shielded arc welding Rework Technics of marine engineering large thick steel plate under low temperature environment according to claim 1,
It is characterized in that：Described prefabricated and reprocess weld seam it uses steel board, steel plate thickness is 50-110mm, reprocesses thickness for 50-
110mm。
3. the medicine core gas shielded arc welding of marine engineering large thick steel plate reprocesses work under low temperature environment according to claim 1 or 2
Skill, it is characterised in that：Described prefabricated and rewelding is sewn on before its weldering, and solder flux will be dried about 2 hours at 300 DEG C -350 DEG C；
Carbon dioxide gas arc welding gas pushing quantity foot:15-25L/min.
4. the medicine core gas shielded arc welding of marine engineering large thick steel plate reprocesses work under low temperature environment according to claim 1 or 2
Skill, it is characterised in that：It is described prefabricated and to reprocess and should calculate heat input during weld seam, it is ensured that carbon dioxide gas arc welding heat
Input is in 1.3-1.7KJ/mm, and submerged-arc welding heat input is in 1.7-3.0KJ/mm.
5. the medicine core gas shielded arc welding Rework Technics of marine engineering large thick steel plate under low temperature environment according to claim 3,
It is characterized in that：It is described prefabricated and to reprocess and should calculate heat input during weld seam, it is ensured that carbon dioxide gas arc welding heat is defeated
Enter in 1.3-1.7KJ/mm, submerged-arc welding heat input is in 1.7-3.0KJ/mm.
6. the medicine core gas shielded arc welding Rework Technics of marine engineering large thick steel plate under low temperature environment according to claim 1,
It is characterized in that：Repair welding is carried out to DH36 mother metals, its CTOD test value at 0 DEG C of gained Seam and heat effected zone >=
0.15mm。
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|---|---|---|---|---|
| CN106964912A (en) * | 2017-04-28 | 2017-07-21 | 广船国际有限公司 | A kind of welding method of low-temperature cast steel part and marine board |
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| CN114734124B (en) * | 2022-05-07 | 2023-07-04 | 广船国际有限公司 | Method for treating electro-gas welding joint |
| CN116604137A (en) * | 2023-07-06 | 2023-08-18 | 蓬莱巨涛海洋工程重工有限公司 | Repair welding method for thick steel plate with yield strength of 355Mpa grade and 80mm |
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