CN108544061B - Nickel-based eccentric flat steel splicing and arranging welding device and welding process - Google Patents
Nickel-based eccentric flat steel splicing and arranging welding device and welding process Download PDFInfo
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- CN108544061B CN108544061B CN201810274658.XA CN201810274658A CN108544061B CN 108544061 B CN108544061 B CN 108544061B CN 201810274658 A CN201810274658 A CN 201810274658A CN 108544061 B CN108544061 B CN 108544061B
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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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
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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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Abstract
The invention discloses a nickel-based eccentric flat steel splicing and arranging welding device which is characterized by comprising a clamping tool, wherein a fixing tool which is arranged at an interval with a pipe and below a flat steel is arranged in the clamping tool. A welding process using a nickel-based eccentric flat steel splicing and arranging welding device is characterized by comprising the following steps of: preparing a welding material: selecting disc-shaped welding wires and welding rods matched with the pipe and the flat steel according to the wall thickness of the pipe; preparing welding equipment: selecting a gas shielded welding power supply and a manual electric arc welding machine which can weld nickel-based materials; in the welding process: performing combined welding by adopting manual electric arc welding and semi-automatic flux-cored wire gas shielded welding; controlling the welding sequence: the workpiece is symmetrically segmented according to the length direction of the welding seam, and a symmetrical and crossed welding sequence from the middle to two sides is needed during welding so as to ensure that the welding deformation is reduced. By adopting the assembly tool, the welding material and the welding sequence provided by the invention, the welding seam can be effectively prevented from cracking.
Description
Technical Field
The invention relates to a nickel-based eccentric flat steel splicing and arranging welding device and a welding process, and belongs to the technical field of machining of gasification furnace internals.
Background
The structure of the hot skirt of the internal part of the current gasification furnace adopts a nickel-based omega-shaped forming pipe to be spliced into a pipe panel by adopting a plasma welding process method and then is pressed and formed. Because the omega tube belongs to the special forming tube, the nickel-based omega forming tube has high manufacturing difficulty and quite high purchasing cost. The method is still in the development stage in China, only can depend on import, and has high raw material cost and long supply period. The plasma welding equipment for splicing the nickel-based omega-shaped forming tube is special mechanical welding equipment introduced abroad, and the equipment cost is high. The problem of weld joint cracking exists in the development of a submerged arc welding test of the nickel-based pipe and the eccentric flat steel in foreign manufacturing plants.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the nickel-based eccentric flat steel row welding device and the welding process for preventing the welding seam from cracking are provided, and the problem of the welding seam cracking in a test that an omega-shaped pipe is replaced by adopting submerged arc welding of a nickel-based pipe and an eccentric flat steel is solved.
In order to solve the technical problem, the technical scheme of the invention is to provide a nickel-based eccentric flat steel arranging and welding device which is characterized by comprising a clamping tool, wherein a fixing tool which is arranged at an interval with a pipe and below a flat steel is arranged in the clamping tool.
Preferably, the clamping tool comprises two oppositely-arranged 7-shaped supporting plates, and the tops of the supporting plates are connected with a pressing plate for pressing the pipe through adjusting bolts.
A welding process using a nickel-based eccentric flat steel splicing and arranging welding device is characterized by comprising the following steps of:
preparing a welding material: selecting disc-shaped welding wires and welding rods matched with the pipe and the flat steel according to the wall thickness of the pipe;
preparing welding equipment: selecting a gas shielded welding power supply and a manual electric arc welding machine which can weld nickel-based materials;
in the welding process: performing combined welding by adopting manual electric arc welding and semi-automatic flux-cored wire gas shielded welding;
controlling the welding sequence: the workpiece is symmetrically segmented according to the length direction of the welding seam, and a symmetrical and crossed welding sequence from the middle to two sides is needed during welding so as to ensure that the welding deformation is reduced.
Preferably, the welding material is prepared by using a disk-shaped welding wire with phi of 0.8-1.6 mm and a welding rod with phi of 3.2-4.0 mm.
Preferably, the welding sequence is controlled, the workpiece is symmetrically segmented according to the length direction of the welding seam, and the length of each segment is 200-350 mm.
Preferably, the combined welding is carried out by adopting manual electric arc welding and semi-automatic flux-cored wire gas shielded welding, and when the manual electric arc welding is adopted, the welding current is 100-110A, and the voltage is 22-28V; when semi-automatic flux-cored wire gas shielded welding is adopted, the welding current is 180-300A; the voltage is 22-30V, and the interlayer temperature is controlled to be less than or equal to 150 ℃ in the welding process.
Preferably, when semi-automatic flux-cored wire gas shielded welding is adopted, shielding gas is introduced, and Ar and CO are adopted as the shielding gas2Mixed protective gas for protectionThe flow rate of the shielding gas is 10-20L/min.
Preferably, a groove is formed on one side of the flat steel, the flat steel on the groove side faces upwards, and a bottom layer is formed on the groove side by adopting semi-automatic flux-cored wire gas shielded welding; then, after a tube panel formed by a plurality of tubes arranged side by side is turned over and fixed, welding a non-groove side by adopting manual electric arc welding; and after the tube panel is turned over and fixed again, welding the residual welding seam on the groove side by adopting semi-automatic flux-cored wire gas shielded welding again, and forming the smooth transition welding seam surface.
Preferably, the angle of the groove is between 20 and 45 degrees; a truncated edge is left at the groove.
The nickel-based steel pipe and the steel plate adopted by the invention are ubiquitous in domestic and foreign markets, the procurement resources are rich, the raw material cost is low, and the supply period is reasonable. The welding process method of the invention is a combined process method of semi-automatic flux-cored wire gas shielded welding and manual electric arc welding, and has the advantages of more common welding equipment and lower equipment cost. According to research, the assembly tool, the welding materials and the welding sequence provided by the invention can be used for obtaining the sealed welding line of the pipe and the eccentric flat steel meeting the design performance, and the welding line can be effectively prevented from cracking.
Drawings
Fig. 1 is a schematic structural diagram of a nickel-based eccentric flat steel splicing and arranging welding device.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The invention relates to a welding process for splicing, arranging and welding nickel-based eccentric flat steel, which is used for manufacturing a hot skirt of an internal part of a shell gasification furnace and comprises the following steps:
preparing a welding material: selecting a disc-shaped welding wire with phi 0.8 mm-phi 1.6mm and a welding rod with phi 3.2 mm-phi 4.0mm which are matched with the pipe and the flat steel 1 according to the wall thickness of the pipe 2;
preparing a welding tool: a special tool is adopted for assembly welding to prevent deformation;
the welding tool is a nickel-based eccentric flat steel arranging and welding device and comprises a clamping tool 3 as shown in figure 1, and a fixing tool 4 which is arranged at an interval with the pipe 2 and below the flat steel 1 is arranged in the clamping tool 3. The clamping tool 3 comprises two support plates 32 which are oppositely arranged and are shaped like a Chinese character '7', and the tops of the support plates 32 are connected with a pressure plate 31 arranged above the pipe 2 through adjusting bolts 33.
Preparing welding equipment: selecting a gas shielded welding power supply and a manual electric arc welding machine which can weld nickel-based materials;
in the welding process: performing combined welding by adopting manual electric arc welding and semi-automatic flux-cored wire gas shielded welding;
preparing before welding: and removing dirt such as oil, rust and the like on the area to be welded.
The combined welding is carried out by adopting manual electric arc welding and semi-automatic flux-cored wire gas shielded welding, and the welding process comprises the following steps:
① when semi-automatic flux-cored wire gas shielded welding is adopted, introducing shielding gas adopting Ar and CO2Protecting by mixing protective gas, wherein the flow rate of the protective gas is 10-20L/min;
② welding specification parameters at welding:
when manual electric arc welding is adopted, the welding current is 100-110A, and the voltage is 22-28V; when semi-automatic flux-cored wire gas shielded welding is adopted, the welding current is 180-300A; the voltage is 22-30V, and the interlayer temperature is controlled to be less than or equal to 150 ℃ in the welding process.
③ the welding sequence is strictly controlled during welding, the workpiece is symmetrically segmented according to the length direction of the welding seam, the length of each segment is 200-350 mm, and the welding sequence which is symmetrical and crossed from the middle to two sides needs to be adopted during welding to ensure that the welding deformation is reduced.
A groove is formed in one side of the flat steel 1, the angle of the groove is 20-45 degrees, and a 3mm truncated edge is reserved. During assembly, as shown in fig. 1, the flat steel 1 on the side of the opening is directed upward. Firstly, adopting a semi-automatic flux-cored wire gas shielded welding groove to weld a bottom layer on the side of the groove; then, after a tube panel formed by a plurality of tubes 2 arranged side by side is turned over and fixed, the non-groove side is welded by adopting manual electric arc welding; and after the tube panel is turned over and fixed again, welding the residual welding seam on the groove side by adopting semi-automatic flux-cored wire gas shielded welding again, and forming the smooth transition welding seam surface.
Claims (7)
1. A nickel-based eccentric flat steel splicing welding process is characterized in that a nickel-based eccentric flat steel splicing welding device is used for welding, the nickel-based eccentric flat steel splicing welding device comprises a clamping tool (3), and a fixing tool (4) which is arranged at an interval with a pipe (2) and is arranged below a flat steel (1) is arranged in the clamping tool (3); the welding process comprises the following steps:
preparing a welding material: selecting disc-shaped welding wires and welding rods matched with the pipe and the flat steel (1) according to the wall thickness of the pipe (2);
preparing welding equipment: selecting a gas shielded welding power supply and a manual electric arc welding machine which can weld nickel-based materials;
in the welding process: performing combined welding by adopting manual electric arc welding and semi-automatic flux-cored wire gas shielded welding;
controlling the welding sequence: symmetrically segmenting a workpiece in the length direction of a welding seam, and adopting a symmetrical and crossed welding sequence from the middle to two sides during welding to ensure that the welding deformation is reduced;
the single side of the flat steel (1) is provided with a groove, the flat steel (1) at the groove side is upward, and a bottom layer is firstly welded at the groove side by adopting semi-automatic flux-cored wire gas shielded welding; then, after a tube panel formed by a plurality of tubes (2) arranged side by side is turned over and fixed, the non-groove side is welded by adopting manual electric arc welding; and after the tube panel is turned over and fixed again, welding the residual welding seam on the groove side by adopting semi-automatic flux-cored wire gas shielded welding again, and forming the smooth transition welding seam surface.
2. The nickel-based eccentric flat steel splicing and arranging welding process according to claim 1, wherein welding materials are prepared by using a disk-shaped welding wire with phi of 0.8-1.6 mm and a welding rod with phi of 3.2-4.0 mm.
3. The nickel-based eccentric flat steel splicing and welding process according to claim 1, wherein the welding sequence is controlled, the workpiece is symmetrically segmented according to the length direction of the welding seam, and the length of each segment is 200-350 mm.
4. The nickel-based eccentric flat steel splicing and arranging welding process according to claim 1, characterized in that the combined welding is carried out by adopting manual arc welding and semi-automatic flux-cored wire gas shielded welding, and when the manual arc welding is adopted, the welding current is 100-110A, and the voltage is 22-28V; when semi-automatic flux-cored wire gas shielded welding is adopted, the welding current is 180-300A; the voltage is 22-30V, and the interlayer temperature is controlled to be less than or equal to 150 ℃ in the welding process.
5. The nickel-based eccentric flat steel splicing welding process according to claim 1 or 4, characterized in that when semi-automatic flux-cored wire gas shielded welding is adopted, shielding gas is introduced, and Ar and CO are adopted as the shielding gas2And (4) mixing protective gas for protection, wherein the flow rate of the protective gas is 10-20L/min.
6. The nickel-based eccentric flat steel splice welding process according to claim 1, wherein the angle of the groove is between 20 and 45 degrees; a truncated edge is left at the groove.
7. The nickel-based eccentric flat steel splicing welding process according to claim 1, characterized in that the clamping tool (3) comprises two oppositely arranged 7-shaped supporting plates (32), and the tops of the supporting plates (32) are connected with a pressing plate (31) for pressing the pipe (2) through adjusting bolts (33).
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| CN201810274658.XA CN108544061B (en) | 2018-03-29 | 2018-03-29 | Nickel-based eccentric flat steel splicing and arranging welding device and welding process |
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| CN201810274658.XA CN108544061B (en) | 2018-03-29 | 2018-03-29 | Nickel-based eccentric flat steel splicing and arranging welding device and welding process |
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| CN108544061A CN108544061A (en) | 2018-09-18 |
| CN108544061B true CN108544061B (en) | 2020-08-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109465559B (en) * | 2018-10-31 | 2021-05-04 | 中国电建集团山东电力建设第一工程有限公司 | Long-abutted seam welding and postweld heat treatment process for high-alloy heat-resistant steel tube panel |
| CN112756753B (en) * | 2021-02-19 | 2022-12-30 | 东方电气集团东方锅炉股份有限公司 | Fillet welding method for high-nickel-iron-base austenitic stainless steel film type wall pipe panel |
| CN115302118A (en) * | 2022-08-12 | 2022-11-08 | 哈尔滨锅炉厂有限责任公司 | Forming method of circular arc tube panel |
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