CN114192942A - Submerged arc automatic welding 2FR node form process - Google Patents
Submerged arc automatic welding 2FR node form process Download PDFInfo
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- CN114192942A CN114192942A CN202111288562.7A CN202111288562A CN114192942A CN 114192942 A CN114192942 A CN 114192942A CN 202111288562 A CN202111288562 A CN 202111288562A CN 114192942 A CN114192942 A CN 114192942A
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- 238000003466 welding Methods 0.000 title claims abstract description 343
- 238000000034 method Methods 0.000 title claims abstract description 57
- 230000008569 process Effects 0.000 title claims abstract description 52
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 238000013461 design Methods 0.000 claims abstract description 3
- 230000004907 flux Effects 0.000 claims description 41
- 238000011049 filling Methods 0.000 claims description 25
- 238000003780 insertion Methods 0.000 claims description 8
- 230000037431 insertion Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 230000001788 irregular Effects 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 9
- 239000001569 carbon dioxide Substances 0.000 abstract description 9
- 230000005855 radiation Effects 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 4
- 239000010953 base metal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000010521 absorption reaction Methods 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
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B23K9/18—Submerged-arc welding
- B23K9/186—Submerged-arc welding making use of a consumable electrodes
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
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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 provides a submerged arc automatic welding 2FR node form process, which is applied to the design of inner and outer welding seams prefabricated by inserting tips of main body components such as a pipe frame steel pile, an oil extraction platform, a living platform upright post and the like in a 2FR welding joint form consisting of a single-side X-shaped groove and a fillet weld in an ocean steel structure, comprises an inserting tip inner seam welding process and an inserting tip outer seam welding process, and is reliable in welding quality by applying the submerged arc automatic welding process to replace a semi-automatic carbon dioxide gas shielded welding process; the welding quality is good, and the mechanization and automation are easy to realize; the radiation and the noise are little, and the labor is saved.
Description
Technical Field
The invention relates to the technical field of welding of prefabricated insertion tips of main body components of marine steel structures, in particular to a 2FR node form submerged automatic welding process.
Background
In the construction and production of the marine steel structure, the welding seam in the form of 2FR node is always welded by a manually operated semi-automatic carbon dioxide gas shielded welding process, and a method of using an automatic submerged arc welding process never exists. The process has the following disadvantages: metal spatters are more in the welding process, and particularly when technological parameter adjustment is not matched, the welding spatters are serious, so that potential safety hazards of scalding are easily caused; the wind resistance is poor when the device is used outdoors, and the defect of welding air holes is easy to occur; the arc light radiation of the welding arc is large, and the arc light intensity is high; the process is a manual semi-automatic welding operation, and has high technical requirement and high difficulty coefficient; the labor intensity of welders is high, and the development requirement of building industry progress cannot be met by a manually operated semi-automatic carbon dioxide gas shielded welding process along with rapid progress of scientific technology.
Disclosure of Invention
The present invention is intended to solve the above technical problems to some extent.
In order to solve the technical problems, the invention provides a submerged arc automatic welding 2FR node form process which has good welding quality and high welding efficiency.
The invention provides a 2FR node form submerged automatic welding process, which is applied to the design of inner and outer welding seams prefabricated by inserting tips of main body components such as a pipe frame steel pile, an oil extraction platform, a living platform upright post and the like in a 2FR welding joint form consisting of a single-side X-shaped groove and a fillet weld in an ocean steel structure, and is characterized by comprising an inserting tip inner seam welding process and an inserting tip outer seam welding process, wherein the inserting tip inner seam welding process comprises the following steps:
a. preparing in the early stage of operation, selecting a direct-current welding power supply DC-1000 type submerged arc automatic welding machine and a welding operation vehicle, wherein a secondary welding power supply adopts a direct-current reverse connection method, the negative electrode of welding equipment is connected with a workpiece, the positive electrode of the welding equipment is connected with the welding operation vehicle, and the welding workpiece is placed on a tool rotating tire capable of adjusting the rotating speed;
b. setting a welding reference, drawing a reference line along the straight edge of an inner insertion tip, and leading out a reference pointer with a stitch coinciding with the reference line on a welding operation vehicle;
c. adjusting the angle of the welding torch to 12 degrees and adjusting the angle of a welding flux conveying pipe to ensure that the welding flux is uniformly conveyed and meet the requirement of welding arc coverage;
d. preheating and measuring the preheating temperature, and measuring the preheating temperature at a position which is at least 75mm away from the edge of the groove on the side opposite to the position of the heating source;
e. starting a welding button to adjust reasonable welding parameters to weld along the datum line in the step b, firstly starting a rotary tire, and adjusting the rotary speed of the rotary tire according to the technological parameters of the welding speed, wherein the backing welding parameters comprise a backing welding wire mark JW-1, the diameter of the backing welding wire mark 2.4mm, a welding flux mark SJ101, welding current 280 plus 330A, welding voltage 25-27V and welding speed 400 plus 650 mm/min; the welding parameters of the hot welding channel are filling welding wire mark JW-1, the diameter is 4.0mm, the flux mark SJ101, the welding current is 480A-570A, the welding voltage is 27V-32V, and the welding speed is 360-; the filling welding parameters are filling welding wire mark JW-1, the diameter is 4.0mm, the flux mark SJ101, the welding current is 550A-650A, the welding voltage is 30V-35V, and the welding speed is 480mm \ min; cover surface welding parameters: the mark JW-1 of the cover welding wire, the diameter of the welding wire is 4.0mm, the mark SJ101 of the welding flux, the welding current is 500A-600A, the welding voltage is 29V-34V, and the welding speed is 350-;
f. observing the forming, receiving and repairing of a welding bead in the welding process, and adjusting a welding operation vehicle when the welding operation vehicle deviates from a reference line;
the outer welding process of the insertion tip comprises the following steps:
A. a scaffold is used for building a welding operation platform;
B. adjusting the welding torch to 12 degrees, and readjusting the angle of the welding flux conveying pipe;
C. readjusting welding parameters for welding, wherein the backing welding parameters comprise a backing welding wire mark JW-1, a diameter of 2.4mm, a flux mark SJ101, a welding current of 280-; welding parameters of the hot welding channel comprise a filling welding wire mark JW-1, the diameter of the filling welding wire is 4.0mm, a welding flux mark SJ101, the welding current is 480-; the filling welding parameters are filling welding wire mark JW-1, the diameter is 4.0mm, the flux mark SJ101, the welding current is 550-; the cover welding parameters are cover welding wire mark JW-1, the diameter is 4.0mm, the flux mark SJ101, the welding current is 500-600A, the welding voltage is 29-34V, and the welding speed is 350-450mm \ min.
Furthermore, the gap between the welding group pair is 2-4 mm.
Further, prior to application, the surface of the weld and the parent material within 25mm of the vicinity should be degreased, damp, rust, dirt, sand, paint, metallic coatings or other foreign matter, including any other temporary attachments or coatings on the support. Rough or irregular edges should be ground or machined to bright metal. The surface of the material to be thermally cut or pneumatically created should be brushed or sanded clean with a power tool prior to welding.
Further, the preheating is carried out on the base metal with the maximum base metal thickness on two sides of the welding seam or within the range of 75 mm.
Furthermore, the preheating position and the temperature measuring position are arranged on the reverse side of the welding side, and the preheating and interlayer temperature measurement is carried out by adopting tools such as a temperature measuring pen, an infrared temperature measuring gun, a contact type pyrometer and the like before each welding arc striking.
Further, in the step b, a submerged arc welding wire with the length of about 300mm is cut to manufacture the reference pointer, and the reference pointer is fixed on the welding operation vehicle in a direction inclined by 45 degrees.
The invention has the beneficial effects that: the submerged arc automatic welding 2FR node form process provided by the invention has the advantages that the submerged arc automatic welding process is applied to replace a semi-automatic carbon dioxide gas shielded welding process, the welding quality is reliable, the welding speed is high, and the production efficiency is high; the welding quality is good, and the mechanization and automation are easy to realize; the radiation and the noise are little, and the labor is saved.
Detailed Description
The present invention is further described with reference to specific examples to enable those skilled in the art to better understand the present invention and to practice the same, but the examples are not intended to limit the present invention.
The specific operation steps of the submerged automatic arc welding 2FR node form process provided by the invention are as follows:
the process for welding the inner seam of the insertion tip comprises the following steps:
the first step is as follows: the welding equipment selects a DC welding power supply DC-1000 type submerged arc automatic welding machine and a welding operation vehicle.
The second step is that: preparation before operation: the secondary welding power source adopts a direct current reverse connection method, the negative electrode of the welding equipment is connected with a workpiece, the positive electrode of the welding equipment is connected with a welding operation vehicle, and the welding workpiece is placed on a tool rotating tire capable of adjusting the rotating speed.
The third step: welding a reference line: and drawing a reference line along the reference point by using a stone pen as a reference by taking the outward 500mm of the straight edge of the inner inserting tip as a reference point for linear walking during welding walking.
The fourth step: welding a walking pointer: and (3) cutting a submerged arc welding wire with the length of about 300mm, rolling out a prototype at the tail part of the submerged arc welding wire, and fixing the prototype on the screw on the welding operation trolley in a direction inclined by 45 degrees so as to judge whether the welding operation trolley travels along a datum line in the welding traveling process and adjust the straightness to avoid the problem of welding deviation.
The fifth step: the angle of the welding flux conveying pipe is adjusted, the effect of uniformly conveying the welding flux is achieved, the requirement of welding arc coverage is met, and normal fusion of a welding pool is guaranteed.
And a sixth step: adjusting the angle of the welding torch: before welding, the welding torch is fixed, practical and loosened, so that the welding torch can be moved left and right, the welding torch is adjusted to be about 8 degrees, and a proper welding angle can be formed between the welding torch and the fillet weld.
The fourth step: temperature measurement requirements: the preheating temperature is measured at a position which is at least about 75mm away from the edge of the groove on the side opposite to the position of the heating source.
And a sixth step: welding start: firstly, starting the rotary tire, and adjusting the rotation speed of the rotary tire according to the technological parameters of the welding speed. A welding button is started to adjust reasonable welding parameters, and the welding trolley rotates forwards through the power wheel to form a good welding process.
The seventh step: backing welding parameters: the backing welding wire is marked JW-1, the diameter is 2.4mm, the flux is marked SJ101, the welding current is 280-.
The ninth step: the welding parameters of the hot welding channel comprise a filling welding wire mark JW-1, the diameter of the filling welding wire is 4.0mm, a welding flux mark SJ101, the welding current is 480-.
The ninth step: filling welding parameters comprise a filling welding wire mark JW-1, the diameter of the filling welding wire is 4.0mm, a welding flux mark SJ101, welding current of 550-.
The tenth step: cover surface welding parameters: the mark JW-1 of the cover welding wire, the diameter of 4.0mm, the mark SJ101 of the welding flux, the welding current of 500-.
The welding process of the outer welding seam of the insertion tip comprises the following steps:
the eleventh step: welding a platform: the scaffold is used for building the welding operation platform according to the field condition, the welding operation platform is firm and reliable, the welding torch and the welding seam are free of the space required for welding in the middle part, reasonable data are formulated by a welder, the space is suitable generally about 300mmx1000mm, transverse rods for hanging safety belts are arranged around the platform and above guardrails and about 1200mm, and therefore safe construction operation of the welder is guaranteed.
The twelfth step: adjusting the angle of the welding torch: before welding, the welding torch is fixed, practical and loosened, so that the welding torch can be moved left and right, the welding torch is adjusted to be about 12 degrees, and a proper welding angle can be formed between the welding torch and the fillet weld.
The thirteenth step: and the angle of the flux conveying pipe is readjusted according to the angle of the welding torch, so that the effect of uniformly conveying the flux in the outer welding process is achieved, the requirement of welding arc coverage is met, and the normal fusion of the welding pool of the outer welding bead is ensured.
The fourteenth step is that: backing welding parameters: the backing welding wire is marked JW-1, the diameter is 2.4mm, the flux is marked SJ101, the welding current is 280-.
The fifteenth step: the welding parameters of the hot welding channel comprise a filling welding wire mark JW-1, the diameter of the filling welding wire is 4.0mm, a welding flux mark SJ101, the welding current is 480-.
Sixteenth, step: filling welding parameters comprise a filling welding wire mark JW-1, the diameter of the filling welding wire is 4.0mm, a welding flux mark SJ101, welding current of 550-.
Seventeenth step: cover surface welding parameters: the mark JW-1 of the cover welding wire, the diameter of 4.0mm, the mark SJ101 of the welding flux, the welding current of 500-.
And eighteenth step: welding continuity: because the pipe wall and the welding groove are uniformly processed workpieces, the parameters of welding equipment are stable, and the welding process can be automatically performed without welding current regulation.
The nineteenth step: hidden danger prevention: the welding trolley is rotated at a proper angle according to the requirement of the position of a welding seam and the head of the welding trolley, and is matched with a proper welding position, so that the quality hidden trouble that the welding is not melted and the slag inclusion defect is caused due to the fact that the welding process is always carried out and the angle change is generated under the action of the inclination gravity of the angle adjustment of the welding torch.
The twentieth step: recovering welding materials: in the welding process, the welding bead forming, the welding agent collecting and the welding agent repairing are observed, the welding auxiliary requirement is met, and a good welding process is formed.
The effect is obtained:
1. taking a plug tip with the diameter of 2.6 meters and the thickness of 80mmx25mm as an example, and the size of a welding leg is designed to be 38mm as an example, the welding task applies a semi-automatic carbon dioxide gas shielded welding process, 2 welders are generally equipped for symmetrical welding, and the welding is completed within 80 hours. Also taking the insertion tip with the diameter of 2.6 meters and the thickness of 80mmx25mm as an example, the size of the welding toe is designed to be 38mm, the welding task applies a submerged arc automatic welding process, 1 welder is equipped, and the total 10 hours are needed for completing the welding.
2. By applying the semi-automatic carbon dioxide gas shielded welding process, the arc light radiation of a welding arc is large, the arc light intensity is high, metal splashing is more in the welding process, and particularly when the process parameter adjustment is not matched, the welding splashing is particularly serious, and the potential safety hazard of scalding is easy to occur. The submerged arc welding is to use a continuously fed welding wire as an electrode and a filling metal, an electric arc is buried under a welding flux layer, heat generated by the electric arc melts the welding wire, the welding flux and a base metal to form a welding seam, and the potential safety hazards of arc radiation and scalding are basically avoided.
3. By applying the semi-automatic carbon dioxide gas shielded welding process, the wind resistance is poor, the influence is greater particularly in outdoor operation, and the welding air hole defect is easy to occur. The automatic submerged arc welding process has welding wire made of stuffing metal inserted into the welding flux layer to produce electric arc with the welding metal, and the welding part is covered with the welding flux layer for protecting and thus has high wind resistance.
4. The semi-automatic carbon dioxide gas shielded welding process is applied, is manual semi-automatic welding operation, is easy to generate welding defects such as unmelted welding, pores, undercut and the like, and has high technical requirement and high difficulty coefficient. The automatic submerged arc welding process has the advantages of good welding joint quality, easy realization of mechanization and automation and simple operation procedure.
5. By applying the semi-automatic carbon dioxide gas shielded welding process, the welding quality is affected by poor gas purity, more impurities (particularly moisture content) and easy moisture absorption of welding materials. Before the welding flux is used in the submerged-arc welding automatic welding process, the welding flux is dried to 350 ℃ by using a welding flux drying box for 1-2 hours, and is kept at 150 ℃ for later use, so that the welding quality can be effectively ensured.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (6)
1. The utility model provides a 2FR node form technology of submerged arc automatic weld welding, uses in the marine steel construction has the prefabricated inside and outside welding seam design of the plug tip of main part components such as pipe support steel pile, oil production platform and life platform stand that unilateral X type groove and fillet weld constitute 2FR welded joint form, its characterized in that, including plug tip inside weld welding technology and plug tip outside weld seam technology, plug tip inside weld welding technology includes following step:
a. preparing in the early stage of operation, selecting a direct-current welding power supply DC-1000 type submerged arc automatic welding machine and a welding operation vehicle, wherein a secondary welding power supply adopts a direct-current reverse connection method, the negative electrode of welding equipment is connected with a workpiece, the positive electrode of the welding equipment is connected with the welding operation vehicle, and the welding workpiece is placed on a tool rotating tire capable of adjusting the rotating speed;
b. setting a welding reference, drawing a reference line along the straight edge of an inner insertion tip, and leading out a reference pointer with a stitch coinciding with the reference line on a welding operation vehicle; .
c. Adjusting the angle of the welding torch to 12 degrees and adjusting the angle of a welding flux conveying pipe to ensure that the welding flux is uniformly conveyed and meet the requirement of welding arc coverage;
d. preheating and measuring the preheating temperature, and measuring the preheating temperature at a position which is at least 75mm away from the edge of the groove on the side opposite to the position of the heating source;
e. starting a welding button to adjust reasonable welding parameters to weld along the datum line in the step b, firstly starting a rotary tire, and adjusting the rotary speed of the rotary tire according to the technological parameters of the welding speed, wherein the backing welding parameters comprise a backing welding wire mark JW-1, the diameter of the backing welding wire mark 2.4mm, a welding flux mark SJ101, welding current 280 plus 330A, welding voltage 25-27V and welding speed 400 plus 650 mm/min; the welding parameters of the hot welding channel are filling welding wire mark JW-1, the diameter is 4.0mm, the flux mark SJ101, the welding current is 480-; the filling welding parameters are filling welding wire mark JW-1, the diameter is 4.0mm, the flux mark SJ101, the welding current is 550-; cover surface welding parameters: the mark JW-1 of the cover welding wire, the diameter of 4.0mm, the mark SJ101 of the welding flux, the welding current of 500-;
f. in the welding process, attention is paid to observing the forming, receiving and repairing of a welding bead, and meanwhile, when a welding operation vehicle deviates from the datum line, the position of the welding operation vehicle is adjusted;
the outer welding process of the insertion tip comprises the following steps:
A. a scaffold is used for building a welding operation platform;
B. adjusting the welding torch to 12 degrees, and readjusting the angle of the welding flux conveying pipe;
C. readjusting welding parameters for welding, wherein the backing welding parameters comprise a backing welding wire mark JW-1, a diameter of 2.4mm, a flux mark SJ101, a welding current of 280-; welding parameters of the hot welding channel comprise a filling welding wire mark JW-1, the diameter of the filling welding wire is 4.0mm, a welding flux mark SJ101, the welding current is 480-; the filling welding parameters are filling welding wire mark JW-1, the diameter is 4.0mm, the flux mark SJ101, the welding current is 550-; the cover welding parameters are cover welding wire mark JW-1, the diameter is 4.0mm, the flux mark SJ101, the welding current is 500-600A, the welding voltage is 29-34V, and the welding speed is 350-450mm \ min.
2. The submerged arc automatic weld 2FR node form process according to claim 1, wherein the weld pair gap is 2-4 mm.
3. A submerged arc automatic welding 2FR node type process according to claim 1, characterized in that before welding, the surface of the welded place and the nearby 25mm parent material should be removed of oil, moisture, rust, dirt, sand, paint, metal coating or other foreign matter, including any other temporary accessories or coatings on the support. Rough or irregular edges should be ground or machined to expose bright metal, and the hot cut or gas-induced material surface should be brushed or sanded clean with a power tool prior to welding.
4. The submerged automatic arc welding 2FR node type process of claim 1, wherein the preheating is performed for the base material within the range of the maximum base material thickness or 75mm on both sides of the weld.
5. The automatic submerged arc welding 2FR node type process according to claim 4, wherein the preheating position and the temperature measurement position are on the opposite side of the welding side, and the preheating and the interlayer temperature measurement are performed before each welding arc striking by using a temperature measuring pen, an infrared temperature measuring gun, a contact type pyrometer and the like.
6. The automatic submerged arc welding 2FR node type process according to claim 1, wherein in step b, a submerged arc welding wire of about 300mm is cut to manufacture the reference pointer, and the reference pointer is fixed on the welding operation vehicle in a 45-degree inclined direction.
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| CN202111288562.7A CN114192942B (en) | 2021-11-02 | 2021-11-02 | Submerged-arc automatic welding 2FR node form process |
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| WO2016173314A1 (en) * | 2015-04-27 | 2016-11-03 | 江苏金通灵流体机械科技股份有限公司 | Method for welding hollow main shaft and solid shaft head |
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| Publication number | Publication date |
|---|---|
| CN114192942B (en) | 2023-06-27 |
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