CN114749764B - Gas-shielded welding process for stainless steel and carbon steel with narrow gap - Google Patents
Gas-shielded welding process for stainless steel and carbon steel with narrow gap Download PDFInfo
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- CN114749764B CN114749764B CN202210456190.2A CN202210456190A CN114749764B CN 114749764 B CN114749764 B CN 114749764B CN 202210456190 A CN202210456190 A CN 202210456190A CN 114749764 B CN114749764 B CN 114749764B
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- 238000003466 welding Methods 0.000 title claims abstract description 205
- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000008569 process Effects 0.000 title claims abstract description 40
- 239000010935 stainless steel Substances 0.000 title claims abstract description 35
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 35
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 21
- 239000010962 carbon steel Substances 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000011229 interlayer Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 230000037452 priming Effects 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 27
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 229910052786 argon Inorganic materials 0.000 claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 24
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000004880 explosion Methods 0.000 description 5
- -1 greasy dirt Inorganic materials 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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
- B23K9/16—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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- 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
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
-
- 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
- B23K9/095—Monitoring or automatic control of welding parameters
-
- 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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a dissimilar steel narrow-gap welding process, in particular to a stainless steel and carbon steel narrow-gap gas shield welding process. The method is suitable for connecting stainless steel with the thickness of 30-200 mm and carbon steel with the thickness of 30-200 mm, and specifically comprises the following steps: i-shaped or U-shaped grooves are selected when the thickness is below 100mm, and double-sided U-shaped grooves are selected when the thickness is between 100 and 200 mm; selecting a stainless steel solid core or flux-cored gas shielded welding wire; the energy of the priming welding line is not more than 20KJ, the energy of the filling line is not more than 30KJ, the welding current range is 100-350A, the voltage is 18-30V, the welding speed is 200-350 mm/min, the swinging angle range is 0-180 degrees, and the side wall residence time is 0-0.8 s; controlling the interlayer temperature in the welding process to be not more than 200 ℃; turning over and welding in 1-4 times of welding during double-sided welding; and in the final three or four welding processes, an external gas protection cover is added for welding. The welding quality is better than that of the traditional welding method, the stress of the welding joint is effectively controlled, the welding efficiency is greatly improved, and the welding cost is greatly reduced.
Description
Technical Field
The invention relates to a dissimilar steel narrow-gap welding process, in particular to a stainless steel and carbon steel narrow-gap gas shield welding process.
Background
With the increasing size of modern industry, the thick plate and ultra-thick plate structure is widely applied. The domestic welding method of the steel materials with large thickness still takes the traditional welding methods such as manual arc welding (SMAW), flux-cored arc welding (FCW), tungsten electrode argon arc welding (GTAW), submerged arc automatic welding (SAW) and the like as the main welding methods. The thickness of the welding structure is continuously increased, so that the original traditional automatic welding shows great limitation and inapplicability, and the biggest defects are that the groove area of the thick plate is rapidly increased, so that the welding engineering quantity is doubled, the production efficiency is low, more welding materials are consumed, the welding cost is high, the heat input quantity is large, the heat affected zone is wide, the grains are coarse, the welding joint has larger residual stress and welding deformation under the combined action of the large thickness restraint degree and the solidification shrinkage force of a large amount of filling metal, the mechanical property of the welding joint is low, and the welding defects such as cracks are easy to generate.
In addition, most of the modern industry and manufacturing industry use or gradually popularize high-strength steel, are very sensitive to welding thermal cycle and cold crack, have extremely high requirements on mechanical properties of welded joints, and the welding is required to be carried out under lower line energy, but a part of production efficiency is definitely reduced. The welding difficulty of the homogeneous steel plate is also enhanced along with the increase of the thickness, and the heterogeneous welding difficulty of the stainless steel and the carbon steel is increased by times. In the fields of chemical industry, ocean, nuclear power and the like, the corrosion resistance of stainless steel and the mechanical property and economic benefit of carbon steel are mostly adopted, so that the characteristics of reducing the cost and realizing higher corrosion resistance are achieved.
The narrow-gap TIG welding method is the most commonly used method for welding stainless steel at present, has the advantages of simple welding operation, no molten drop transition and wider process window, but has low production efficiency, is not suitable for all-position welding in narrow-gap submerged arc welding, can well solve the problems in narrow-gap gas-shield welding, but has the advantages that the process window is narrow, the use is limited due to difficult splashing control, and the exploration of a suitable narrow-gap gas-shield welding process route is necessary.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a gas-shielded welding process for a narrow gap between stainless steel and carbon steel. The welding quality is better than that of the traditional welding method, the stress of the welding joint is effectively controlled, the welding efficiency is greatly improved, and the welding cost is greatly reduced.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the narrow-gap gas-shielded welding process for stainless steel and carbon steel is suitable for connecting stainless steel with the thickness of 30-200 mm and carbon steel with the thickness of 30-200 mm, and specifically comprises the following steps:
1) Different forms of grooves are designed for stainless steel and carbon steel with different thicknesses, an I-shaped groove or a U-shaped groove is selected when the thickness of any one of the two steel plates is below 100mm, and a double-sided U-shaped groove is selected when the thickness of the two steel plates is between 100 and 200 mm.
2) According to the grade of stainless steel, a stainless steel solid core or flux-cored gas shielded welding wire with the diameter of 0.8-1.6 mm is selected.
3) Before welding, polishing, gas heating and other modes are adopted to remove iron rust, greasy dirt, water and other impurities on the surface of the steel plate so as to ensure the welding quality.
4) And (3) performing welding assembly, wherein if an I-shaped groove is selected, the bottom gap is 9-12 mm, the groove angle is 3-5 degrees, and a homogeneous steel plate with a proper size can be used for the bottom gap or a ceramic liner can be selected.
If the U-shaped groove is selected, the bottoms are combined together, the blunt edge of the bottoms is 1-2 mm in size, the diameter of the bottoms is 9-12 mm, and the top gap is 14-25 mm.
If the double-sided U-shaped grooves are selected, the bottoms are combined together, the blunt edge of the bottoms is 1-3 mm, the diameter of the bottoms is 9-12 mm, and the top gap is 14-20 mm.
5) After the groove is formed, the arc striking plate with the same shape as the groove is connected at the beginning and the end of the welding bead, so that the defects of forming air holes and the like in an actual welding area are avoided.
6) The following shielding gases are selected, such as high-purity argon, mixed gas of 98% argon and 2% oxygen, and mixed gas of 98% argon and 2% carbon dioxide.
7) Proper welding process parameters (current, voltage and welding speed) and swing parameters (swing angle and side wall residence time) are selected, the energy of a priming welding line is not more than 20KJ, the energy of a filling line is not more than 30KJ, the welding current range is 100-350A, the voltage is 18-30V, the welding speed is 200-350 mm/min, the swing angle range is 0-180 degrees, and the side wall residence time is 0-0.8 s.
8) The interlayer temperature in the welding process is controlled to be not more than 200 ℃.
9) In the welding process, arc swing parameters can be automatically or manually adjusted by observing the welding arc, so that the welding quality of a welding joint is ensured, and welding defects such as unfused welding, undercut and the like are avoided.
10 During double-sided welding, the welding is turned over for 1-4 times, so that cracks at the welding seam caused by stress concentration are avoided.
11 During the last three or four welding, an external gas protection cover is added for welding so as to ensure that no welding defects such as air holes and the like are generated.
12 After welding, the arc striking device, the backboard and the like can be removed by cutting or carbon arc gas explosion and other modes.
Compared with the prior art, the method has the beneficial effects that:
1. according to the invention, grooves with different forms are designed aiming at marine steel structures with different thicknesses, a U-shaped groove is selected when the thickness is below 100mm, and a double-sided U-shaped groove is selected when the thickness is between 100 and 200 mm; the welding requirements under different environments are met, and the narrow-gap gas-shield welding is convenient.
2. The invention performs welding assembly, if an I-shaped groove is selected, the bottom gap is 9-12 mm; if a U-shaped groove is selected, the top gap is 14-25 mm; if the double-sided U-shaped groove is selected, the top gap is 14-20 mm, the groove is narrow, single-layer single-pass welding can be realized, stress concentration caused by excessive passes is avoided, crack tendency is reduced, and the stress of a welded joint is effectively controlled. Meanwhile, in the double-sided welding, the invention turns over the welding during 1-4 times of welding, so as to avoid stress concentration caused by restraint and crack caused by overlarge stress at the welding seam;
3. the arc striking plate consistent with the groove in shape is used, so that the defects of forming air holes and the like in an actual welding area are avoided, the integrity of the whole structure is ensured, and the repair cost after welding is reduced.
4. According to the invention, the filling layer height is controlled by changing the welding current and the welding speed, the side wall swinging angle and the swinging speed are changed to control the side wall forming condition in cooperation with the residence time, so that a stable gas-shielded welding process window is found, slag inclusion caused by splashing is avoided, the welding slag floats on the surface, independent slag removal is not needed, the welding efficiency is improved to a greater extent on the premise of improving the welding one-time forming rate, and the welding cost is reduced.
5. And in the final three or four welding processes, an external gas protection cover is added for welding so as to ensure that no welding defects such as air holes and the like are generated.
Drawings
FIG. 1 is a schematic view of a groove according to example 1 of the present invention;
FIG. 2 is a schematic view of a groove according to example 2 of the present invention;
fig. 3 is a schematic view of a groove according to example 4 of the present invention.
Detailed Description
The invention discloses a gas-shielded welding process for a narrow gap between stainless steel and carbon steel. Those skilled in the art can, with the benefit of this disclosure, suitably modify the process parameters to achieve this. It is expressly noted that all such similar substitutions and modifications will be apparent to those skilled in the art, and are deemed to be included in the present invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those skilled in the relevant art that variations and modifications can be made in the methods and applications described herein, and in the practice and application of the techniques of this invention, without departing from the spirit or scope of the invention.
Example 1:
the embodiment is applied to welding of 60mm thick Q345 carbon steel and 60mm thick 304 stainless steel, and comprises the following specific processes:
1) As shown in FIG. 1, an I-shaped groove is selected, the bottom gap is 11mm, the groove angle is 4 degrees, and a stainless steel plate with the thickness of 100mm is selected as a back plate.
2) A matched stainless steel 1.2mm er308l solid gas shielded welding wire was selected.
3) And before welding, removing impurities such as rust, greasy dirt, water and the like on the surface of the steel plate by adopting a mechanical polishing mode so as to ensure welding quality.
4) After the groove group is paired, arc striking plates with the same shape as the groove are connected at two positions of the starting point and the end point of the welding bead, so that the defects of forming air holes and the like in an actual welding area are avoided.
5) A mixed gas of 98% argon and 2% carbon dioxide is selected.
6) The welding current is 220A, the voltage is 21.5V, the welding speed is 280mm/min, the swing angle range is 30-60 degrees, and the sidewall residence time is 0.3s.
7) The interlayer temperature during the welding process was 150 ℃.
8) In the welding process, arc swing parameters are manually adjusted by observing the welding arc, so that the welding quality of a welding joint is ensured, and welding defects such as unfused welding, undercut and the like are avoided.
9) During the last four welding processes, an external gas protection cover is added for welding so as to ensure that no welding defects such as air holes and the like are generated.
10 The arc striking device and the backboard can be removed by utilizing a carbon arc gas explosion mode after welding.
11 The quality of the welded joint is good, no welding defect exists, the mechanical property inspection meets the national standard requirements, and the corrosion resistance of the stainless steel is ensured.
Example 2:
the embodiment is applied to welding of DH36 carbon steel with the thickness of 75mm and 308 stainless steel with the thickness of 75mm, and the specific process is as follows:
1) As shown in FIG. 2, a U-shaped groove was selected, the blunt edge at the bottom was 1.5mm in size, the diameter at the bottom was 11mm, and the gap at the top was 17mm.
2) A matched stainless steel 1.2mm er309l solid gas shielded welding wire was selected.
3) And before welding, removing impurities such as rust, greasy dirt, water and the like on the surface of the steel plate by adopting a mechanical polishing mode so as to ensure welding quality.
4) After the groove group is paired, arc striking plates with the same shape as the groove are connected at two positions of the starting point and the end point of the welding bead, so that the defects of forming air holes and the like in an actual welding area are avoided.
5) A mixture of 98% argon and 2% oxygen was selected.
6) The welding current is 200A, the voltage is 21V, the welding speed is 260mm/min, the swing angle range is 30-70 degrees, and the side wall residence time is 0.2s.
7) The interlayer temperature during the welding process was 180 ℃.
8) In the welding process, arc swing parameters are manually adjusted by observing the welding arc, so that the welding quality of a welding joint is ensured, and welding defects such as unfused welding, undercut and the like are avoided.
9) During the last four welding processes, an external gas protection cover is added for welding so as to ensure that no welding defects such as air holes and the like are generated.
10 The arc striking device can be removed by utilizing a carbon arc gas explosion mode after welding is completed.
11 The quality of the welded joint is good, no welding defect exists, the mechanical property inspection meets the national standard requirements, and the corrosion resistance of the stainless steel is ensured.
Example 3:
the embodiment is applied to welding of Q690 carbon steel with the thickness of 120mm and 308 stainless steel with the thickness of 50mm, and the specific process is as follows:
1) The U-shaped groove is selected, the blunt edge at the bottom is 1.5mm, the diameter of the bottom is 10mm, and the top gap is 15mm.
2) A matched stainless steel 1.2mm er309l solid gas shielded welding wire was selected.
3) And before welding, removing impurities such as rust, greasy dirt, water and the like on the surface of the steel plate by adopting a mechanical polishing mode so as to ensure welding quality.
4) After the groove group is paired, arc striking plates with the same shape as the groove are connected at two positions of the starting point and the end point of the welding bead, so that the defects of forming air holes and the like in an actual welding area are avoided.
5) A mixture of 98% argon and 2% oxygen was selected.
6) The welding current is 260A, the voltage is 23V, the welding speed is 270mm/min, the swing angle range is 30-70 degrees, and the side wall residence time is 0.3s.
7) The interlayer temperature during the welding process was 180 ℃.
8) In the welding process, arc swing parameters are manually adjusted by observing the welding arc, so that the welding quality of a welding joint is ensured, and welding defects such as unfused welding, undercut and the like are avoided.
9) During the last four welding processes, an external gas protection cover is added for welding so as to ensure that no welding defects such as air holes and the like are generated.
10 The arc striking device can be removed by utilizing a carbon arc gas explosion mode after welding is completed.
11 The quality of the welded joint is good, no welding defect exists, the mechanical property inspection meets the national standard requirements, and the corrosion resistance of the stainless steel is ensured.
Example 4:
the embodiment is applied to welding of 155mm thick Q460 carbon steel and 155mm thick 316 stainless steel, and comprises the following specific processes:
1) As shown in FIG. 3, a double-sided U-shaped groove is selected, the blunt edge at the bottom is 2mm in size, the diameter at the bottom is 12mm, and the top clearance is 18mm.
2) A matched stainless steel 1.2mm er309l solid gas shielded welding wire was selected.
3) And before welding, removing impurities such as rust, greasy dirt, water and the like on the surface of the steel plate by adopting a mechanical polishing mode so as to ensure welding quality.
4) After the groove is formed, arc striking plates with the same shape as the groove are connected at the starting point and the end point of the welding bead, so that the defects of forming air holes and the like in an actual welding area are avoided.
5) A mixture of 98% argon and 2% oxygen was selected.
6) The welding current is 215A, the voltage is 24V, the welding speed is 300mm/min, the swing angle range is 30-65 degrees, and the side wall residence time is 0.3s.
7) The interlayer temperature during the welding process was 150 ℃.
8) In the welding process, arc swing parameters are manually adjusted by observing the welding arc, so that the welding quality of a welding joint is ensured, and welding defects such as unfused welding, undercut and the like are avoided.
9) When in double-sided welding, the welding is turned over for 2 times of welding, so that the occurrence of cracks at the welding seam caused by stress concentration is avoided.
10 During the last 6 welding, namely 3 times are left on the two sides, an external gas protection cover is added for welding so as to ensure that no welding defects such as air holes and the like are generated.
11 The arc striking device can be removed by utilizing a carbon arc gas explosion mode after welding is completed.
12 The quality of the welded joint is good, no welding defect exists, the mechanical property inspection meets the national standard requirements, and the corrosion resistance of the stainless steel is ensured.
The invention belongs to the field of welding process application, and mainly provides an efficient welding process for two different steel types of stainless steel and carbon steel, which is mainly used for an efficient welding method for welding the stainless steel and the carbon steel heterogeneous steel, especially based on the field of narrow-gap gas-shield welding.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (1)
1. The narrow-gap gas-shield welding process for the stainless steel and the carbon steel is characterized by being suitable for connection between the stainless steel with the thickness of 30-200 mm and the carbon steel with the thickness of 30-200 mm, and specifically comprising the following steps of:
1) When the stainless steel is welded with the carbon steel, an I-shaped groove or a U-shaped groove is selected if any one of the two steel plates is less than 100mm, and a double-sided U-shaped groove is selected when the two steel plates are 100-200mm thick;
2) According to the grade of stainless steel, selecting a stainless steel solid core or flux-cored gas shielded welding wire matched with the grade of stainless steel, wherein the diameter is 0.8-1.6 mm;
3) Removing impurities on the surface of the steel plate before welding;
4) Performing welding assembly, wherein if an I-shaped groove is selected, the bottom gap is 9-12 mm, the groove angle is 3-5 degrees, and a homogeneous steel plate with corresponding size or a ceramic liner is used for the bottom gap;
if the U-shaped groove is selected, the bottoms are combined together, the blunt edge of the bottoms is 1-2 mm in size, the diameter of the bottoms is 9-12 mm, and the top gap is 14-25 mm;
if the double-sided U-shaped grooves are selected, the bottoms are combined together, the blunt edge of the bottoms is 1-3 mm in size, the diameter of the bottoms is 9-12 mm, and the top gap is 14-20 mm;
5) After the groove group pair, connecting an arc striking plate with the same shape as the groove at two starting and ending positions of the welding bead;
6) The shielding gas is selected from high-purity argon, mixed gas of 98% argon and 2% oxygen and mixed gas of 98% argon and 2% carbon dioxide;
7) The energy of the priming welding line is not more than 20KJ, the energy of the filling line is not more than 30KJ, the welding current range is 100-350A, the voltage is 18-30V, the welding speed is 200-350 mm/min, the swinging angle range is 0-180 degrees, and the side wall residence time is 0-0.8 s;
8) Controlling the interlayer temperature in the welding process to be not more than 200 ℃;
9) Turning over and welding in 1-4 times of welding during double-sided welding;
10 No matter what type of groove is adopted, an external gas protection cover is added for welding in the last three or four welding processes;
11 And (3) removing the arc striking device and the backboard after welding.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101564790A (en) * | 2008-04-25 | 2009-10-28 | 中国海洋石油总公司 | Gas protection welding process for offshore steel structure |
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