CN109967842A - A kind of EH36 high strength steel slab does not preheat submerged arc soldering method - Google Patents
A kind of EH36 high strength steel slab does not preheat submerged arc soldering method Download PDFInfo
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- CN109967842A CN109967842A CN201910413049.2A CN201910413049A CN109967842A CN 109967842 A CN109967842 A CN 109967842A CN 201910413049 A CN201910413049 A CN 201910413049A CN 109967842 A CN109967842 A CN 109967842A
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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
- B23K9/02—Seam welding; Backing means; Inserts
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
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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
- B23K9/18—Submerged-arc welding
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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
- B23K9/32—Accessories
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- Arc Welding In General (AREA)
Abstract
Submerged arc soldering method is not preheated the invention proposes a kind of EH36 high strength steel slab, comprising the following steps: processes X-type welding groove in the weld of EH36 high strength steel slab；Completion tack welding at X-type welding groove is welded in by auto-manual system CO2 gas shield；Run-on tab and arc-extinguishing plate is respectively welded at the both ends of X-type welding groove by way of auto-manual system CO2 gas shielded arc welding；Solder flux and diameter is selected to weld at tack weld to welded blank for the welding wire of 5mm, temperature is kept for 230 DEG C hereinafter, after the welding of per pass weld seam between road in welding process, carries out scarfing cinder work；After the completion of the welding filling of front groove, groove root is cleared up by way of carbon arc air gouging and cooperative mechanical polishing, then sealing run is filled.The present invention can effectively avoid the generation of weld crack to ensure weldquality, while reduce the investment of the equipment of weld preheating, the energy, artificial etc., reduce production cost, shorten the production cycle.
Description
Technical field
The present invention relates to submerged-arc welding process, and in particular to a kind of EH36 high strength steel slab does not preheat submerged-arc welding side
Method.
Background technique
The platform of wind-powered electricity generation installation is in operation process, and fixed pile chamber, spud leg, shoe are the main support structures of platform, not only
Hull weight and loop wheel machine load are born, the shock loading of the environment such as wave, sea wind formation, therefore its structural behaviour are still suffered from
Directly determine the ability to work of wind-powered electricity generation mounting platform.
EH36 is a kind of high-strength steel for ship structure of the yield strength rank more than or equal to 355MPa, is had good low
Warm impact flexibility has been applied to fixed pile chamber, shoe outside plate and reinforcement structure, and mostly slab designs, and can be improved platform
Impact resistance.But during EH36 thick plates, since constraint (restraint) degree is larger, and slab heat dissipation is very fast, and cooling velocity is big,
It is easy to form cold crack in welding point, it usually needs carry out the technological measure of weld preheating.And weld preheating needs to provide
The investments such as more equipment, the energy, artificial could be completed, and production cost is big and the production cycle is long.
Summary of the invention
In view of the deficiencies of the prior art, what the present invention proposed a kind of EH36 high strength steel slab does not preheat submerged arc soldering method,
It can effectively avoid the generation of weld crack to ensure weldquality, while reduce the equipment of weld preheating, the energy, artificial etc.
Investment reduces production cost, shortens the production cycle.
The technical scheme of the present invention is realized as follows: a kind of EH36 high strength steel slab does not preheat submerged arc soldering method,
Specifically includes the following steps:
Step 1, X-type welding groove is processed in the weld that welded blank is EH36 high strength steel slab, wherein X-type welds
The angle that the relevant parameter of groove is respectively as follows: front groove is 55 °~65 °, and positive groove depth is the 2/3 of plate thickness, back side slope
The angle of mouth is 60 °~70 °, and root face is 4~6mm, root gap 0-1mm；After processing, to the oxygen of X-type welding groove surface
Change the impurity around layer and X-type welding groove within the scope of 20-30mm to be cleared up；
Step 3, completion tack welding at X-type welding groove is welded in by auto-manual system CO2 gas shield, in which: tack welding
Stitch a length of 50mm, weld spacing 300mm；After the completion of tack welding, the surface welding slag of tack weld is cleared up, and checks tack weld
Surface, to guarantee that its non-welding surface connects defect；
Step 4, striking is respectively welded at the both ends of X-type welding groove by way of auto-manual system CO2 gas shielded arc welding
Plate and arc-extinguishing plate；
Step 5, solder flux and diameter is selected to be welded for the welding wire of 5mm in the front groove of welded blank, wherein solder flux
And the Weld Performance after welding wire welding meets the relevant art index of F7A0-EH14 in AWS A5.17 wlding standard；Wherein, exist
The front groove of welded blank carries out relevant parameter when backing run welding and filler pass welding are as follows:
When backing run welds, welding current 500-550A, weldingvoltage 27-30V, speed of welding 40-45cm/min；
When filler pass welds, welding current 650-700A, weldingvoltage 28-31V, speed of welding 45-52cm/min；
Temperature is kept for 230 DEG C hereinafter, after the welding of per pass weld seam between road in welding process, carries out scarfing cinder work；
Step 6, after the completion of front groove welding filling, to groove root by way of carbon arc air gouging and cooperative mechanical polishing
Portion is cleared up, and is then filled to sealing run；Wherein, relevant parameter when filling are as follows: welding current 650-700A, weldering
Meet voltage 28-31V, speed of welding 45-52cm/min.
Further, further includes:
Step 2, run-on tab and arc-extinguishing plate are assembled respectively at the both ends of X-type welding groove, then clear up miscellaneous at each groove
Matter；Wherein, the material of run-on tab and arc-extinguishing plate is consistent with the material of EH36 high strength steel slab, the thickness of run-on tab and arc-extinguishing plate
Spend the consistency of thickness with EH36 high strength steel slab.
Further, in step 5, temperature is maintained between 85-198 DEG C between road in welding process, per pass weld seam welding knot
Scarfing cinder is carried out after beam.
Further, in step 5, the trade mark of the welding wire is Atlantic Ocean CHW-S3, and the trade mark of the solder flux is the Atlantic Ocean
CHF101。
Further, for the solder flux using the baking for preceding having been subjected to 2h, stoving temperature is 300-350 DEG C.
Further, in step 5, when backing run welds, welding current 521A, weldingvoltage 29V, speed of welding
42cm/min；When filler pass welds, welding current 686A, weldingvoltage 31V, speed of welding 47cm/min.
Further, in step 6, sealing run is filled, relevant parameter are as follows: welding current 686A, weldingvoltage
31V, speed of welding 47cm/min.
Further, in step 1, when processing X-type welding groove, gas flame cuttiug mode, plasma cut mode can be used
And/or machine cut mode.
Further, further includes:
Step 7, after for 24 hours, Welded Joints surface carries out Magnetic testing, and surveys sample welding point by ray detection
Weld seam internal soundness it is whether qualified.
Further, the thickness of the EH36 high strength steel slab is less than or equal to 64mm.
Compared with prior art, the invention has the following advantages that by the method for the invention, in thickness less than or equal to 64mm's
When carrying out submerged-arc welding on EH36 high strength steel slab, can avoid weld preheating process, reduce the equipment of weld preheating, the energy,
Manually equal investment, reduces production cost, shortens the production cycle；In addition, the method for the present invention can effectively avoid welding from splitting
The generation of line, it is ensured that weldquality.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the welding groove of EH36 high strength steel slab；
Fig. 2 is the positive structure schematic of EH36 high strength steel slab；
Fig. 3 is the structure schematic diagram of EH36 high strength steel slab；
Fig. 4 is the structural schematic diagram for carrying out gouge in EH36 high strength steel slab and clearing up position.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
FIG. 1 to FIG. 4 is structural schematic diagram when EH36 high strength steel slab is assembled, below with reference to FIG. 1 to FIG. 4 and reality
Example is applied to be specifically addressed.
Embodiment 1
Present embodiment discloses a kind of welded blanks not to preheat submerged arc soldering method for EH36 high strength steel slab, wherein
The thickness of EH36 high strength steel slab is less than or equal to 64mm, specifically includes the following steps:
Step 1, X-type welding groove is processed in the weld of EH36 high strength steel slab, wherein X-type welding groove is corresponding
The angle that parameter is respectively as follows: front groove is 55 °~65 °, and positive groove depth is the 2/3 of plate thickness, and the angle of underside groove is
60 °~70 °, root face is 4~6mm, root gap 0-1mm；Oxide layer and X-type weldering after processing, to X-type welding groove surface
The impurity (including oxide layer, iron rust, moisture or the other impurities etc. at groove) around groove within the scope of 20-30mm is connect to carry out clearly
Reason, to prevent in the welding process, in impurity near X-type welding groove solder-down weld seam, so be easy to produce crackle, stomata,
The welding defects such as slag inclusion；
Wherein, submerged-arc welding usually has V-type welding groove and X-type welding groove, and for plate sheet welding, V-type welding can be used
Groove；For thick plates, V-type welding groove cross-sectional area is much bigger, and welding material loading is more, and X-type is used to weld
Groove can save welding material；Therefore, because the EH36 high strength steel slab of the present embodiment is slab, in order to save welding material
Material, using X-type welding groove.
In the embodiment of the present invention, bevel angle wlding loading if excessive increases, and bevel angle is too small, welds
When electric arc climbs up groove face, especially during root pass welding, it is easy to influence welding penetration, so that welding quality is influenced,
The generation of weld crack is caused, therefore the angle of front groove in the present embodiment is set as to the angle of 55 °~65 °, underside groove
Be set as 60 °~70 ° it is proper.
And for root face, after front groove has welded if root face length is excessive, back side gouge back chipping workload is increased, and
The too small then backing run welding process of root face length is easy to burn.
Wherein, when processing X-type welding groove, gas flame cuttiug mode, plasma cut mode or machine cut side can be used
The modes such as formula are processed.
Step 2, run-on tab and arc-extinguishing plate are assembled respectively at the both ends of X-type welding groove, then clear up miscellaneous at each groove
Matter；Wherein, the material of run-on tab and arc-extinguishing plate is consistent with the material of EH36 high strength steel slab, the thickness of run-on tab and arc-extinguishing plate
The consistency of thickness with EH36 high strength steel slab is spent, to avoid the generation of crackle when welding.
Step 3, completion tack welding at X-type welding groove is welded in by auto-manual system CO2 gas shield, in which: tack welding
Stitch a length of 50mm, weld spacing 300mm；After the completion of tack welding, tack weld surface welding slag is cleared up, and check tack weld table
Face, to guarantee that its non-welding surface connects defect；
Since welding process has welding deformation, enough binding force effects are not provided if tack weld is too short, are led
Tack weld is caused to be easy cracking；And tack weld is too long, then influences steel plate assembly efficiency.Likewise, weld spacing is too long, equally
Enough welding stresses are not provided；And weld spacing it is too short when, tack welding increases, same to influence steel plate assembly efficiency.This hair
In bright embodiment, indicate by practice: as a length of 50mm of tack weld and when weld spacing is 300mm, effect is preferable, provides
Enough binding force effects, are not easily susceptible to cracking tack weld.
Step 4, striking is respectively welded at the both ends of X-type welding groove by way of auto-manual system CO2 gas shielded arc welding
Plate and arc-extinguishing plate；
Step 5, solder flux and diameter is selected to carry out multilayer multiple tracks sequential welding in the front groove of welded blank for the welding wire of 5mm
It connects, the relevant art that the Weld Performance after wherein solder flux and welding wire weld meets F7A0-EH14 in AWS A5.17 wlding standard refers to
Mark；Wherein, the relevant parameter when the front groove of welded blank carries out backing run welding and filler pass welds are as follows:
When backing run welds, welding current 500-550A, weldingvoltage 27-30V, speed of welding 40-45cm/min；
When filler pass welds, welding current 650-700A, weldingvoltage 28-31V, speed of welding 45-52cm/min；
Temperature is kept for 230 DEG C hereinafter, after the welding of per pass weld seam between road in welding process, carries out scarfing cinder work；Its
In, if interlayer temperature is higher than 230 DEG C, welding point is heated serious, will have a direct impact on its mechanical property, causes strength reduction, tough
Property reduce.
AWS A5.17 is a kind of wlding standard of American Welding Association, and F7A0-EH14 is then one of this standard
Wlding type.In the embodiment of the present invention, when being welded to welded blank, used solder flux and welding wire weld after weldering
Seam performance meets the relevant art index of F7A0-EH14 in AWS A5.17 wlding standard.At this point, when using diameter for the weldering of 5mm
When silk carries out backing run welding and filler pass welding, corresponding welding current, weldingvoltage and speed of welding distinguish institute as above
Show, can avoid the generation of weld crack, and does not have to preheating in welding process.
In embodiment of the present invention, the Atlantic Ocean wlding limited liability company welding wire produced and solder flux of selection, wherein
The trade mark of welding wire is Atlantic Ocean CHW-S3, and the trade mark of solder flux is Atlantic Ocean CHF101.In welding process, welding arc is in solder flux heap
Middle burning, solder flux can protect electric arc.
Step 6, after the completion of front groove welding filling, to groove root by way of carbon arc air gouging and cooperative mechanical polishing
Portion is cleared up, and is then filled to sealing run；Wherein, relevant parameter when filling are as follows: welding current 650-700A, weldering
Meet voltage 28-31V, speed of welding 45-52cm/min.
Multilayer multiple tracks is carried out at the front groove of X-type welding groove continuously to weld, and is welded and is filled by backing run
Pass weld is filled the underside groove of X-type welding groove for after positive groove welding completely；And to X-type welding groove
Before underside groove is filled, the welding slag and incomplete penetration defect at the backing run back side are cleared up by gouge, and carry out to coarse place
It polishes and clears up the impurity generated after polishing, then carry out the filling of underside groove, referring specifically to Fig. 4.
Step 7, after for 24 hours, Magnetic testing is carried out to solder flux connector, and the weldering of welding point is surveyed sample by ray detection
Whether qualified stitch internal soundness；
Testing result shows, face of weld zero defect, and the weld seam internal soundness of welding point is qualified.
In embodiment of the present invention, inside weld is possible to delayed crack occur to postwelding for 24 hours, for 24 hours after weld seam is examined again
It is more accurate to survey obtained testing result.
In the embodiment of the present invention, tested by qualification of welding procedure, in which: welding point tensile strength >=490MPa, it is curved
Song test is bent the flaws length≤3mm or no flaws on 180 ° of joint samples surfaces, punching at curved core diameter 4a
Hit each region average impact function >=34J of -20 DEG C of lower contacts of temperature.Therefore the property of welded joint that the embodiment of the present invention is welded is equal
Meet ABS classification society and CCS classification society rule requires.
It by the method for the invention, can when carrying out submerged-arc welding on EH36 high strength steel slab of the thickness less than or equal to 64mm
Weld preheating process is avoided, reduces the investment of the equipment of weld preheating, the energy, artificial etc., reduces production cost, shorten
Production cycle；In addition, the method for the present invention can effectively avoid the generation of weld crack, it is ensured that weldquality.
Embodiment 2
Present embodiment discloses a kind of welded blanks not to preheat submerged arc soldering method for EH36 high strength steel slab, wherein
The thickness of EH36 high strength steel slab is not less than 64mm, specifically includes the following steps:
Step 1, X-type welding groove is processed in the weld of EH36 high strength steel slab, wherein X-type welding groove is corresponding
The angle that parameter is respectively as follows: front groove is 55 °~65 °, and positive groove depth is the 2/3 of plate thickness, and the angle of underside groove is
60 °~70 °, root face is 4~6mm, root gap 0-1mm；Oxide layer and X-type weldering after processing, to X-type welding groove surface
The impurity (including oxide layer, iron rust, moisture or the other impurities etc. at groove) around groove within the scope of 20-30mm is connect to carry out clearly
Reason in the impurity solder-down weld seam near X-type welding groove, and then is easy to produce crackle to prevent in the welding process；
Wherein, when processing X-type welding groove, gas flame cuttiug mode, plasma cut mode or machine cut side can be used
The modes such as formula are processed.
Step 2, run-on tab and arc-extinguishing plate are assembled respectively at the both ends of X-type welding groove, then clear up miscellaneous at each groove
Matter；Wherein, the material of run-on tab and arc-extinguishing plate is consistent with the material of EH36 high strength steel slab, the thickness of run-on tab and arc-extinguishing plate
The consistency of thickness with EH36 high strength steel slab is spent, to avoid the generation of crackle when welding.
Step 3, completion tack welding at X-type welding groove is welded in by auto-manual system CO2 gas shield, in which: tack welding
Stitch a length of 50mm, weld spacing 300mm；After the completion of tack welding, tack weld surface welding slag is cleared up, and check tack weld table
Face, to guarantee that its non-welding surface connects defect；
Wherein, welding defect refers to that face of weld has the welding defects such as stomata, crackle, arc crater.
Since welding process has welding deformation, enough binding force effects are not provided if tack weld is too short, are led
Tack weld is caused to be easy cracking；And tack weld is too long, then influences steel plate assembly efficiency.Likewise, weld spacing is too long, equally
Enough welding stresses are not provided；And weld spacing it is too short when, tack welding increases, same to influence steel plate assembly efficiency.This hair
In bright embodiment, indicate by practice: as a length of 50mm of tack weld and when weld spacing is 300mm, effect is preferable, provides
Enough binding force effects, are not easily susceptible to cracking tack weld.
Step 4, striking is respectively welded at the both ends of X-type welding groove by way of auto-manual system CO2 gas shielded arc welding
Plate and arc-extinguishing plate；
Step 5, solder flux and diameter is selected to carry out multilayer multiple tracks sequential welding in the front groove of welded blank for the welding wire of 5mm
It connects, the relevant art that the Weld Performance after wherein solder flux and welding wire weld meets F7A0-EH14 in AWS A5.17 wlding standard refers to
Mark, and solder flux, using the baking for preceding having been subjected to 2h, stoving temperature is 300-350 DEG C；Wherein, in the front groove of welded blank
Carry out relevant parameter when backing run welding and filler pass welding are as follows:
It selects solder flux and diameter to carry out multilayer multiple tracks to welded blank front groove for the welding wire of 5mm continuously to weld, wherein
Weld Performance after solder flux and welding wire welding meets the relevant art index of F7A0-EH14 in AWS A5.17 wlding standard, and
For solder flux using the baking for preceding having been subjected to 2h, stoving temperature is 300-350 DEG C, may remaining moisture in solder flux to remove；Wherein,
Relevant parameter when carrying out backing run welding and filler pass welding to welded blank front groove are as follows:
When backing run welds, welding current 521A, weldingvoltage 29V, speed of welding 42cm/min；
When filler pass welds, welding current 686A, weldingvoltage 31V, speed of welding 47cm/min；
Temperature is maintained between 85-198 DEG C between road in welding process, after per pass weld seam welds, carries out clinkerer
Make；
Wherein, AWS A5.17 is a kind of wlding standard of American Welding Association, and F7A0-EH14 is then in this standard
A kind of wlding type.In the embodiment of the present invention, when welding to welded blank, used solder flux and welding wire are welded
Weld Performance afterwards meets the relevant art index of F7A0-EH14 in AWS A5.17 wlding standard.At this point, when use diameter for
When the welding wire of 5mm carries out backing run welding and filler pass welding, corresponding welding current, weldingvoltage and speed of welding difference
As it appears from the above, can avoid the generation of weld crack, and preheating is not had in welding process.
In embodiment of the present invention, the Atlantic Ocean wlding limited liability company welding wire produced and solder flux of selection, wherein
The trade mark of welding wire is Atlantic Ocean CHW-S3, and the trade mark of solder flux is Atlantic Ocean CHF101.In welding process, welding arc is in solder flux heap
Middle burning, solder flux can protect electric arc.
Step 6, after the completion of front groove welding filling, to groove root by way of carbon arc air gouging and cooperative mechanical polishing
Portion is cleared up, and is then filled to sealing run；Wherein, relevant parameter when filling are as follows: welding current 686A, welding electricity
Press 31V, speed of welding 47cm/min；
Multilayer multiple tracks is carried out at the front groove of X-type welding groove continuously to weld, and is welded and is filled by backing run
Pass weld is filled the underside groove of X-type welding groove for after positive groove welding completely；And to X-type welding groove
Before underside groove is filled, the welding slag and incomplete penetration defect at the backing run back side are cleared up by gouge, and carry out to coarse place
It polishes and clears up the impurity generated after polishing, then carry out the filling of underside groove.
Step 7, after for 24 hours, Welded Joints surface carries out Magnetic testing, and surveys sample welding point by ray detection
Weld seam internal soundness it is whether qualified；
Testing result shows, face of weld zero defect, and the weld seam internal soundness of welding point is qualified.
In embodiment of the present invention, inside weld is possible to delayed crack occur to postwelding for 24 hours, for 24 hours after weld seam is examined again
It is more accurate to survey obtained testing result.
Qualification of welding procedure test, welding point tension are carried out to the welding point after welding of the embodiment of the present invention below
Detected intensities, welding point bend test testing result, impact toughness of welded joint testing result difference are as follows:
Welding point draws tensile strength testing result
| Specimen coding | Tensile strength (MPa) | Fracture position |
| 1-1 | 543 | Weld seam |
| 1-2 | 539 | Base material |
| 1-3 | 552 | Base material |
| 1-4 | 545 | Base material |
Welding point bend test testing result
Impact toughness of welded joint testing result
Wherein, in above table, WM indicates Weld pipe mill position, and FL indicates that fusion line position, FL+1 indicate distance fusion
The heat affected area position of line 1mm, FL+2 indicate the heat affected area position apart from melt run 2mm, and FL+5 is indicated apart from melt run 5mm
Heat affected area position；Face is to weld side after welding point, at the 2mm of test coupon surface；Root is welding point root face position.
The above testing result shows in the embodiment of the present invention: welding point tensile strength >=490MPa, bend test is curved
Flaws length≤the 3mm or no flaws on 180 ° of joint samples surfaces of bending under core diameter 4a, -20 DEG C of impact temperature
Each region average impact function >=34J of lower contact.Therefore the property of welded joint that the embodiment of the present invention is welded is all satisfied ABS ship's classification
Society and CCS classification society rule require.
By the method for the invention, it when carrying out submerged-arc welding on EH36 high strength steel slab, does not need to preheat before weldering, reduce
The investment of the equipment of weld preheating, the energy, artificial etc., reduces production cost, shortens the production cycle；In addition, side of the present invention
Method can effectively avoid the generation of weld crack, it is ensured that weldquality.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of EH36 high strength steel slab does not preheat submerged arc soldering method, which comprises the following steps:
Step 1, X-type welding groove is processed in the weld that welded blank is EH36 high strength steel slab, wherein X-type welding groove
Relevant parameter be respectively as follows: front groove angle be 55 °~65 °, positive groove depth be plate thickness 2/3, underside groove
Angle is 60 °~70 °, and root face is 4~6mm, root gap 0-1mm；After processing, to the oxide layer of X-type welding groove surface
And the impurity around X-type welding groove within the scope of 20-30mm is cleared up；
Step 3, completion tack welding at X-type welding groove is welded in by auto-manual system CO2 gas shield, in which: tack weld is long
For 50mm, weld spacing 300mm；After the completion of tack welding, the surface welding slag of tack weld is cleared up, and checks tack weld table
Face, to guarantee that its non-welding surface connects defect；
Step 4, by way of auto-manual system CO2 gas shielded arc welding the both ends of X-type welding groove be respectively welded run-on tab and
Arc-extinguishing plate；
Step 5, solder flux and diameter is selected to be welded for the welding wire of 5mm in the front groove of welded blank, wherein solder flux and weldering
Weld Performance after wire bond connects meets the relevant art index of F7A0-EH14 in AWS A5.17 wlding standard；Wherein, it is welding
The front groove of plate carries out relevant parameter when backing run welding and filler pass welding are as follows:
When backing run welds, welding current 500-550A, weldingvoltage 27-30V, speed of welding 40-45cm/min；
When filler pass welds, welding current 650-700A, weldingvoltage 28-31V, speed of welding 45-52cm/min；
Temperature is kept for 230 DEG C hereinafter, after the welding of per pass weld seam between road in welding process, carries out scarfing cinder work；
Step 6, front groove welding filling after the completion of, carbon arc air gouging and cooperative mechanical polishing by way of to groove root into
Row cleaning, is then filled sealing run；Wherein, relevant parameter when filling are as follows: welding current 650-700A, welding electricity
Press 28-31V, speed of welding 45-52cm/min.
2. EH36 high strength steel slab as described in claim 1 does not preheat submerged arc soldering method, which is characterized in that further include:
Step 2, run-on tab and arc-extinguishing plate are assembled respectively at the both ends of X-type welding groove, then clear up the impurity at each groove；Its
In, the material of run-on tab and arc-extinguishing plate is consistent with the material of EH36 high strength steel slab, and the thickness of run-on tab and arc-extinguishing plate is equal
With the consistency of thickness of EH36 high strength steel slab.
3. EH36 high strength steel slab as described in claim 1 does not preheat submerged arc soldering method, which is characterized in that in step 5, weldering
Temperature is maintained between 85-198 DEG C between road in termination process, and per pass weld seam carries out scarfing cinder after welding.
4. EH36 high strength steel slab as described in claim 1 does not preheat submerged arc soldering method, which is characterized in that in step 5, institute
The trade mark for stating welding wire is Atlantic Ocean CHW-S3, and the trade mark of the solder flux is Atlantic Ocean CHF101.
5. EH36 high strength steel slab as described in claim 1 does not preheat submerged arc soldering method, which is characterized in that the solder flux makes
With the baking for preceding having been subjected to 2h, stoving temperature is 300-350 DEG C.
6. EH36 high strength steel slab as claimed in claim 5 does not preheat submerged arc soldering method, which is characterized in that in step 5, beat
When the pass weld of bottom, welding current 521A, weldingvoltage 29V, speed of welding 42cm/min；When filler pass welds, welding electricity
Flow 686A, weldingvoltage 31V, speed of welding 47cm/min.
7. EH36 high strength steel slab as claimed in claim 6 does not preheat submerged arc soldering method, which is characterized in that right in step 6
Sealing run is filled, relevant parameter are as follows: welding current 686A, weldingvoltage 31V, speed of welding 47cm/min.
8. EH36 high strength steel slab as described in claim 1 does not preheat submerged arc soldering method, which is characterized in that in step 1, add
When work X-type welding groove, gas flame cuttiug mode, plasma cut mode and/or machine cut mode can be used.
9. EH36 high strength steel slab as described in claim 1 does not preheat submerged arc soldering method, which is characterized in that further include:
Step 7, after for 24 hours, Welded Joints surface carries out Magnetic testing, and the weldering of welding point is surveyed sample by ray detection
Whether qualified stitch internal soundness.
10. EH36 high strength steel slab does not preheat submerged arc soldering method as described in claim 1~9 is any, which is characterized in that institute
The thickness for stating EH36 high strength steel slab is less than or equal to 64mm.
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| CN110560849A (en) * | 2019-09-05 | 2019-12-13 | 广州黄船海洋工程有限公司 | soft gasket single-side submerged arc welding process for EH36 high-strength steel thick plate |
| CN110640277A (en) * | 2019-09-30 | 2020-01-03 | 广州黄船海洋工程有限公司 | Q420 high-strength steel thick plate non-preheating double-wire submerged-arc welding process |
| CN111545877A (en) * | 2020-05-18 | 2020-08-18 | 江苏联峰实业有限公司 | Welding method of carbon structural steel |
| CN111843132A (en) * | 2020-08-07 | 2020-10-30 | 江南造船(集团)有限责任公司 | Submerged arc welding process for 304L stainless steel thick plate |
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| CN111843132A (en) * | 2020-08-07 | 2020-10-30 | 江南造船(集团)有限责任公司 | Submerged arc welding process for 304L stainless steel thick plate |
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| CN114799429A (en) * | 2022-04-15 | 2022-07-29 | 江南造船(集团)有限责任公司 | High-deposition-rate submerged arc automatic welding method for high-strength steel thick plate |
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