CN117283099A - Submerged arc welding method for high fracture toughness liquid carbon dioxide storage tank steel - Google Patents
Submerged arc welding method for high fracture toughness liquid carbon dioxide storage tank steel Download PDFInfo
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- CN117283099A CN117283099A CN202311373906.3A CN202311373906A CN117283099A CN 117283099 A CN117283099 A CN 117283099A CN 202311373906 A CN202311373906 A CN 202311373906A CN 117283099 A CN117283099 A CN 117283099A
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- welding
- submerged arc
- carbon dioxide
- arc welding
- liquid carbon
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- 238000003466 welding Methods 0.000 title claims abstract description 187
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 31
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 31
- 239000007788 liquid Substances 0.000 title claims abstract description 28
- 238000003860 storage Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011049 filling Methods 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 5
- 230000004927 fusion Effects 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003892 spreading 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
- B23K9/18—Submerged-arc welding
-
- 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
- B23K9/32—Accessories
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a submerged arc welding method of high fracture toughness liquid carbon dioxide storage tank steel; the operation steps are as follows: groove processing, assembly welding, root welding, filling and cover welding; the invention adopts welding rods to carry out pairing and root welding; the invention also limits the deposited metal components of the submerged arc welding wire; this definition ensures that a sufficient amount of Ni is present in the weld after welding to ensure low temperature impact toughness of the weld; in addition, the invention adopts the code plates to restrain the side wall of the tank body, and the code plates are additionally arranged at intervals of 1.5-2 m, so that the upper steel plate and the lower steel plate can be effectively fixed, and the stress release during welding is restrained, so that the deformation is caused; too large spacing has insufficient restraint force, too small spacing can increase cost and affect subsequent submerged arc welding; finally, the submerged arc welding parameters in the invention are divided into a 1 st welding way, a 2 nd welding way and subsequent welding ways; the submerged arc welding method can realize submerged arc welding of the steel plate of the high-breaking-toughness liquid carbon dioxide storage tank, is expected to be applied to manufacturing of the marine liquid carbon dioxide storage tank on a large scale, and has wide prospect.
Description
Technical Field
The invention belongs to the technical field of welding, and relates to a submerged arc welding method for high fracture toughness liquid carbon dioxide storage tank steel.
Background
With the trend of global low carbon development, disposal and utilization of carbon dioxide are important concerns of industry. The key to low carbon is to reduce carbon dioxide emissions, but for carbon dioxide that has to be emitted, it is necessary to collect and dispose of, where storing carbon dioxide in liquid form is a common industry solution.
A tank capable of storing liquid carbon dioxide is required to be manufactured from a steel sheet having good low-temperature toughness; at present, the industry has developed carbon-manganese low-temperature steel of Q355 level, which has excellent CTOD performance at-50 ℃ and excellent impact performance at-80 ℃, and the low-temperature toughness meets the use requirement. However, the method cannot be applied on a large scale because of no matched submerged arc welding method.
Therefore, it is required to develop a submerged arc welding method for high fracture toughness liquid carbon dioxide storage tank steel, which realizes submerged arc welding of Q355-grade high fracture toughness liquid carbon dioxide storage tank steel plates and caters to low carbon development trend.
Disclosure of Invention
The invention aims to: the invention aims to provide a submerged arc welding method for high-fracture-toughness liquid carbon dioxide storage tank steel, which can weld Q355-grade high-fracture-toughness liquid carbon dioxide storage tank steel, has good welding forming and meets the use requirement.
The technical scheme is as follows: the submerged arc welding method for the high fracture toughness liquid carbon dioxide storage tank steel comprises the following operation steps:
(1): groove processing;
(2): assembling and welding;
(3): welding a root welding line;
(4): filling and capping welding.
Further, in the step (1), the groove machining specifically includes: an asymmetric X-shaped groove is formed, a gap of 2-3 mm is reserved at the root part, a large groove faces the outer side of the storage tank, and a small groove faces the inner side of the storage tank; see in particular fig. 1.
Further, in the step (2), the pair of welding specifically includes: when grooves are assembled, code plates are additionally arranged at intervals of 1.5-2 m in the tank body, and welding seams of 80-120 mm are welded between the two code plates.
Further, in the step (3), the root-welded seam is specifically: and during the root welding, CHE-507RH welding is adopted, and the two code plates are welded in opposite directions from two ends of the welding seam respectively between the two code plates in the assembly welding, so that the operation is completed in the central position.
Furthermore, the code plate is H-shaped steel with the length of 0.6-0.8 m, the code plate is vertically and equally divided into welding seams, and two support edges are welded on the tank body.
Further, in the step (4), the filling and capping welding specifically includes: adopting a submerged arc welding mode, welding between the two code plates of the assembly welding, paving 3-5 mm high flux on a welding line in advance before welding, filling and welding, and then capping welding;
and removing the code plate after the cover surface welding is finished, and repairing the welding seam covered by the welding code plate.
Furthermore, the submerged arc welding is used for designing and limiting deposited metal components, and the chemical components of the submerged arc welding are as follows in percentage by weight: c:0.037 to 0.058wt%, si:0.46 to 0.62 weight percent, mn:0.92 to 1.43wt percent, cr:0.02 to 0.04 weight percent of Mo: 0.009-0.015 wt%, ni:2.92 to 3.63 weight percent, less than or equal to 0.005 weight percent of P, less than or equal to 0.003 weight percent of S, and the balance of Fe and unavoidable impurities.
Further, the technological parameters of submerged arc welding are as follows: welding in the 1 st pass, wherein the current is 380-420A, the voltage is 28.8-30.5V, and the welding speed is 26-32 cm/min;
carrying out 2 nd and subsequent welding, wherein the current is 400-440A, the voltage is 32.8-34.5V, and the welding speed is 26-32 cm/min;
the fusion ratio of the 1 st welding is large, and the groove is narrow; the 2 nd channel and the subsequent grooves are large.
The beneficial effects are that: compared with the prior art, the invention has the characteristics that: 1. the submerged arc welding method adopts the welding rods to carry out the pairing and root welding, has higher welding quality compared with the direct submerged arc welding mode, and prevents the phenomenon of steel leakage caused by overlarge heat input and steel plate burning; 2. the invention limits the deposited metal components of the submerged arc welding wire, wherein, the weight percent of C is 0.037 to 0.058 percent, the weight percent of Si is 0.46 to 0.62 percent, the weight percent of Mn is 0.92 to 1.43 percent, the weight percent of Cr is 0.02 to 0.04 percent, the weight percent of Mo is 0.009 to 0.015 percent, the weight percent of Ni is 2.92 to 3.63 percent, the weight percent of P is less than or equal to 0.005 percent, the weight percent of S is less than or equal to 0.003 percent, and the balance is Fe and unavoidable impurities. This definition ensures that there is a sufficient amount of Ni in the weld after welding to ensure low temperature impact toughness of the weld, while the low C design can prevent the excessive strength from affecting CTOD performance; 3. according to the invention, the code plates are adopted to restrain the side wall of the tank body, and the code plates are additionally arranged every 1.5-2 m, so that the upper steel plate and the lower steel plate can be effectively fixed, and the deformation caused by stress release during welding is restrained. Too large spacing has insufficient restraint force, too small spacing can increase cost and affect subsequent submerged arc welding; 4. in the invention, submerged arc welding parameters are divided into 2 types: welding in the 1 st pass, wherein the current is 380-420A, the voltage is 28.8-30.5V, and the welding speed is 26-32 cm/min; and the 2 nd and subsequent welding, the current is 400-440A, the voltage is 32.8-34.5V, and the welding speed is 26-32 cm/min. The welding process 1 has large fusion ratio and narrow groove, and if large current heat input is adopted, coarse grains can cause the performance of the welding seam to be reduced, so that the current 1 must be small and moderate welding speed is matched. The 2 nd channel and the subsequent grooves are slightly larger, but too high heat input is not needed, and meanwhile, the voltage is increased to ensure the spreading of the molten pool, so that the forming quality is improved.
Drawings
Fig. 1 is a schematic illustration of a groove in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Example 1:
submerged arc welding of the liquid carbon dioxide storage tank steel with the thickness of 30mm and the high fracture toughness is carried out by adopting the submerged arc welding method:
1. groove processing: an asymmetric X-shaped groove is formed, a gap of 2-3 mm is reserved at the root, a large groove faces the outer side of the storage tank, and a small groove faces the inner side of the storage tank.
2. And (3) welding: when grooves are assembled, H-shaped steel with the length of 0.6m is adopted, code plates are additionally arranged at intervals of 1.5m on the inner side of the tank body, two support edges are welded on the tank body, and a welding seam with the length of 80mm is welded between the two code plates;
3. root welding: adopting CHE-507RH welding, and between the two code plates of the assembly welding, respectively welding from two ends of the welding seam in opposite directions by 2 welders, and completing the operation at the central position;
4. filling and capping welding, adopting a submerged arc welding mode, wherein deposited metal components of the submerged arc welding material are as follows: 0.037wt% of C, 0.54wt% of Si, 1.43wt% of Mn, 0.04wt% of Cr, 0.015wt% of Mo, 3.45wt% of Ni, less than or equal to 0.005wt% of P, less than or equal to 0.003wt% of S, and the balance of Fe and unavoidable impurities.
5. Submerged arc welding is carried out between the two code plates of the assembly welding, 3-5 mm high flux is paved on the welding seam in advance before welding, filling welding is carried out firstly, and then cover surface welding is carried out;
welding in the 1 st pass, wherein the current is 380-420A, the voltage is 28.8-30.5V, and the welding speed is 26-32 cm/min; and the 2 nd and subsequent welding, the current is 400-440A, the voltage is 32.8-34.5V, and the welding speed is 26-32 cm/min.
And removing the code plate after the cover surface welding is finished, and repairing the welding seam covered by the welding code plate.
The CTOD values of the obtained joint weld joints are 0.21, 0.28 and 0.24 at the temperature of minus 50 ℃ and AKv is 80, 97 and 84J at the temperature of minus 80 ℃ so as to meet the use requirements.
Example 2:
submerged arc welding of the liquid carbon dioxide storage tank steel with the thickness of 60mm and the high fracture toughness is carried out by adopting the submerged arc welding method:
1. groove processing: an asymmetric X-shaped groove is formed, a gap of 2-3 mm is reserved at the root part, a large groove faces the outer side of the storage tank, and a small groove faces the inner side of the storage tank;
2. and (3) welding: when grooves are assembled, H-shaped steel with the length of 0.8m is adopted, code plates are additionally arranged at intervals of 1.8m on the inner side of the tank body, two support edges are welded on the tank body, and a welding seam with the length of 100mm is welded between the two code plates;
3. root welding: adopting CHE-507RH welding, and between the two code plates of the assembly welding, respectively welding from two ends of the welding seam in opposite directions by 2 welders, and completing the operation at the central position;
4. filling and capping welding, adopting a submerged arc welding mode, wherein deposited metal components of the submerged arc welding material are as follows: 0.058wt% of C, 0.46wt% of Si, 0.92wt% of Mn, 0.02wt% of Cr, 0.009wt% of Mo, 2.92wt% of Ni, less than or equal to 0.005wt% of P, less than or equal to 0.003wt% of S, and the balance of Fe and unavoidable impurities;
5. submerged arc welding is carried out between the two code plates of the assembly welding, 3-5 mm high flux is paved on the welding seam in advance before welding, filling welding is carried out firstly, and then cover surface welding is carried out;
welding in the 1 st pass, wherein the current is 380-420A, the voltage is 28.8-30.5V, and the welding speed is 26-32 cm/min; carrying out 2 nd and subsequent welding, wherein the current is 400-440A, the voltage is 32.8-34.5V, and the welding speed is 26-32 cm/min;
and removing the code plate after the cover surface welding is finished, and repairing the welding seam covered by the welding code plate.
The CTOD values of the obtained joint weld joints are 0.20, 0.23 and 0.21 at the temperature of minus 50 ℃ and AKv is 74, 82 and 76J at the temperature of minus 80 ℃ so as to meet the use requirements.
Example 3:
the submerged arc welding method is adopted to carry out submerged arc welding on the liquid carbon dioxide storage tank steel with the thickness of 80mm and the high fracture toughness:
1. groove processing: an asymmetric X-shaped groove is formed, a gap of 2-3 mm is reserved at the root part, a large groove faces the outer side of the storage tank, and a small groove faces the inner side of the storage tank;
2. and (3) welding: when grooves are assembled, H-shaped steel with the length of 0.8m is adopted, code plates are additionally arranged at intervals of 2m on the inner side of the tank body, two support edges are welded on the tank body, and a welding seam with the length of 120mm is welded between the two code plates;
3. root welding: adopting CHE-507RH welding, and between the two code plates of the assembly welding, respectively welding from two ends of the welding seam in opposite directions by 2 welders, and completing the operation at the central position;
4. filling and capping welding, adopting a submerged arc welding mode, wherein deposited metal components of the submerged arc welding material are as follows: 0.046wt% of C, 0.62wt% of Si, 1.22wt% of Mn, 0.03wt% of Cr, 0.011wt% of Mo, 3.63wt% of Ni, less than or equal to 0.005wt% of P, less than or equal to 0.003wt% of S, and the balance of Fe and unavoidable impurities;
5. submerged arc welding is carried out between the two code plates of the assembly welding, 3-5 mm high flux is paved on the welding seam in advance before welding, filling welding is carried out firstly, and then cover surface welding is carried out;
welding in the 1 st pass, wherein the current is 380-420A, the voltage is 28.8-30.5V, and the welding speed is 26-32 cm/min; carrying out 2 nd and subsequent welding, wherein the current is 400-440A, the voltage is 32.8-34.5V, and the welding speed is 26-32 cm/min;
and removing the code plate after the cover surface welding is finished, and repairing the welding seam covered by the welding code plate.
The CTOD values of the obtained joint weld joints are 0.31, 0.29 and 0.25 at the temperature of minus 50 ℃ and AKv is 104, 92 and 95J at the temperature of minus 80 ℃ so as to meet the use requirements.
The submerged arc welding method can realize submerged arc welding of the steel plate of the high-breaking-toughness liquid carbon dioxide storage tank, is expected to be applied to manufacturing of the marine liquid carbon dioxide storage tank on a large scale, and has wide prospect.
Claims (10)
1. A submerged arc welding method for high fracture toughness liquid carbon dioxide storage tank steel is characterized by comprising the following operation steps:
(1): groove processing;
(2): assembling and welding;
(3): welding a root welding line;
(4): filling and capping welding.
2. The submerged arc welding method of high fracture toughness liquid carbon dioxide tank steel according to claim 1, wherein in step (1), the beveling is specifically: an asymmetric X-shaped groove is formed, a gap of 2-3 mm is reserved at the root, a large groove faces the outer side of the storage tank, and a small groove faces the inner side of the storage tank.
3. The submerged arc welding method of high fracture toughness liquid carbon dioxide tank steel according to claim 1, wherein in step (2), the pairing welding is specifically: when grooves are assembled, code plates are additionally arranged at intervals of 1.5-2 m in the tank body, and welding seams of 80-120 mm are welded between the two code plates.
4. The submerged arc welding method of high fracture toughness liquid carbon dioxide tank steel according to claim 1, wherein in step (3), the root seam welding is specifically: and during the root welding, CHE-507RH welding is adopted, and the two code plates are welded in opposite directions from two ends of the welding seam respectively between the two code plates in the assembly welding, so that the operation is completed in the central position.
5. The submerged arc welding method for high fracture toughness liquid carbon dioxide storage tank steel according to claim 4, wherein the code plates are H-shaped steel with the length of 0.6-0.8 m, the code plates are vertically and equally divided into welding seams, and two support edges are welded on the tank body.
6. The submerged arc welding method of high fracture toughness liquid carbon dioxide tank steel according to claim 1, wherein in step (4), the filling and capping weld is specifically: and welding the two code plates in the butt welding mode by adopting a submerged arc welding mode.
7. The submerged arc welding method of high fracture toughness liquid carbon dioxide tank steel according to claim 6, wherein 3-5 mm high flux is laid on the weld joint in advance before welding, filling welding is performed first, and then cover welding is performed;
and removing the code plate after the cover surface welding is finished, and repairing the welding seam covered by the welding code plate.
8. The submerged arc welding method of high fracture toughness liquid carbon dioxide tank steel according to claim 6, wherein the submerged arc welding is designed and limited on deposited metal components, and comprises the following chemical components in percentage by weight: c:0.037 to 0.058wt%, si:0.46 to 0.62 weight percent, mn:0.92 to 1.43wt percent, cr:0.02 to 0.04 weight percent of Mo: 0.009-0.015 wt%, ni:2.92 to 3.63 weight percent, less than or equal to 0.005 weight percent of P, less than or equal to 0.003 weight percent of S, and the balance of Fe and unavoidable impurities.
9. The submerged arc welding method of high fracture toughness liquid carbon dioxide tank steel according to claim 6, wherein the technological parameters of submerged arc welding are as follows: welding in the 1 st pass, wherein the current is 380-420A, the voltage is 28.8-30.5V, and the welding speed is 26-32 cm/min;
and the 2 nd and subsequent welding, the current is 400-440A, the voltage is 32.8-34.5V, and the welding speed is 26-32 cm/min.
10. The submerged arc welding method of high fracture toughness liquid carbon dioxide tank steel according to claim 9, wherein the fusion ratio of the 1 st weld is large and the groove is narrow; the 2 nd channel and the subsequent grooves are large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311373906.3A CN117283099A (en) | 2023-10-23 | 2023-10-23 | Submerged arc welding method for high fracture toughness liquid carbon dioxide storage tank steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311373906.3A CN117283099A (en) | 2023-10-23 | 2023-10-23 | Submerged arc welding method for high fracture toughness liquid carbon dioxide storage tank steel |
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- 2023-10-23 CN CN202311373906.3A patent/CN117283099A/en active Pending
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