CN110000522B - Welding method of full penetration impeller - Google Patents
Welding method of full penetration impeller Download PDFInfo
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- CN110000522B CN110000522B CN201910358268.5A CN201910358268A CN110000522B CN 110000522 B CN110000522 B CN 110000522B CN 201910358268 A CN201910358268 A CN 201910358268A CN 110000522 B CN110000522 B CN 110000522B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/006—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass turbine wheels
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- Structures Of Non-Positive Displacement Pumps (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention discloses a welding method of a full penetration impeller, which is characterized by comprising the following steps of: the method comprises the following steps: respectively processing grooves on the side of the non-working surface of the blade close to the front disc, the side of the working surface of the blade close to the rear disc and the sawteeth of the rear disc; step two: combining and molding the blades, the front disc and the rear disc; step three: backing, filling and capping the weld joint on the side of the groove by adopting carbon dioxide gas shielded welding; step four: the non-groove side of the blade is provided with a groove through a carbon arc gouging, and then is polished; step five: manually priming the non-groove side, polishing after priming, and then filling and capping by adopting carbon dioxide arc welding; step six: after welding, carrying out integral annealing stress-relief treatment on the impeller; step seven: and (4) carrying out flaw detection after welding on the whole impeller by adopting ultrasonic waves and magnetic powder. The invention delays the abrasion speed of the impeller by improving the strength of the welding line, thereby prolonging the service life of the impeller.
Description
Technical Field
The invention relates to a welding method, in particular to a welding method of a full penetration impeller.
Background
At present, the welding of the impeller of the industrial centrifugal fan adopts a fillet weld connection mode, and because the impeller is formed by combining a front disc, blades and a rear disc into a closed space which is smaller in space, all the manufacturing processes are implemented by adopting a non-penetration welding process at present. However, the non-penetration welding method can cause the strength of the welding seam to be reduced, especially in places with severe working conditions (such as places with abrasion or corrosion), the welding seam area is firstly abraded or corroded when the impeller runs, and as the full penetration welding process is not adopted in the welding seam, the flying accident of the blade can be caused due to insufficient strength, and the loss is brought to personal safety, equipment safety and property.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a welding method of a full penetration impeller, which delays the abrasion speed of the impeller by improving the strength of a welding seam, thereby prolonging the service life of the impeller.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention discloses a welding method of a full penetration impeller, which is characterized by comprising the following steps:
the method comprises the following steps: a single-side groove is formed on the non-working surface of the blade close to the front disc, the angle of the groove is 50 degrees, and the truncated edge is 0.5 mm; a single-side groove is formed on the side, close to the rear disc, of the working surface of the blade, the angle of the groove is 50 degrees, and the truncated edge is 2 mm; forming a K-shaped asymmetric groove at the sawtooth part of the rear disc, wherein the groove angle of the large groove side is 45 degrees, the groove angle of the small groove side is 55 degrees, and the truncated edge is 2 mm;
step two: reinforcing the blades by adopting a reinforcing plate, and reinforcing the front disc by adopting a process ring; then combining and molding the blades, the front disc and the rear disc;
step three: before welding, polishing a 50mm area on the groove side until the metallic luster is exposed, and then bottoming, filling and capping the weld joint on the groove side by adopting carbon dioxide gas shielded welding;
step four: the non-groove side of the blade is provided with a groove through a carbon arc gouging, and then is polished;
step five: manually priming the non-groove side, polishing after priming, and then filling and capping by adopting carbon dioxide arc welding;
step six: after welding, carrying out integral annealing stress relief treatment on the impeller, integrally heating the impeller to 560 ℃ along with the furnace, then keeping the temperature in the furnace at 560 ℃ for 4 hours, cooling to 200 ℃ along with the furnace, and finally discharging from the furnace for air cooling;
step seven: and (4) carrying out flaw detection after welding on the whole impeller by adopting ultrasonic waves and magnetic powder.
Preferably, in the second step, the tack welds of the blades are all welded on the non-groove side, and the tack weld of the rear disc is welded on the small groove side; and when in positioning welding, manual electric arc welding is adopted, a welding rod with phi 4.0 is selected, and the welding current is 15% -20% larger than that during normal welding.
Preferably, in the third step, an oxyacetylene gun is used for preheating the groove and two sides of the groove before welding, the groove is required to be heated to 150 ℃, and water stains and oil stains on the groove and two sides of the groove are removed.
Preferably, in the third step, after the weld seam is primed, polishing is performed until the metallic luster is exposed, then filling is performed, after filling is completed, polishing is performed until the metallic luster is exposed, and finally covering welding is performed.
Preferably, in the fourth step, a carbon arc air gouging is adopted to open a U-shaped groove on the non-groove side of the blade, then root back chipping is carried out, and polishing treatment is carried out until the metallic luster is exposed.
Preferably, in the fifth step, a welding rod with the diameter of 3.2 is selected for priming, the welding current is 100-115A, and polishing treatment is carried out after priming is finished until the metallic luster is exposed.
Preferably, in the seventh step, the polishing wheel is used for polishing and grinding the welding seam and two sides of the welding bead, then ultrasonic flaw detection is carried out on the inner side of the welding seam, and then magnetic powder flaw detection is carried out on the surface.
The invention has the following beneficial effects:
1) according to the invention, the cover surface is filled by adopting carbon dioxide gas shielded welding, so that the welding efficiency is effectively improved.
2) The invention delays the abrasion speed of the impeller by improving the strength of the welding line, thereby prolonging the service life of the impeller.
3) The invention adopts a reasonable welding process to ensure the stability of the product quality.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of an impeller according to the present invention.
Fig. 2 is a schematic diagram of the back plate groove in fig. 1.
FIG. 3 is a schematic view of the blade groove of FIG. 1.
FIG. 4 is a front view of the blade stiffener plate of FIG. 1.
FIG. 5 is a side view of the blade stiffener plate of FIG. 1.
Fig. 6 is a schematic view of the welding of portion a-a in fig. 4.
Fig. 7 is a schematic view of the welding of portion B-B in fig. 5.
Wherein, 1-front disc; 2-a rear disc; 3-a blade; 4-reinforcing plate.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description.
The welding method of the full penetration impeller disclosed by the invention comprises the following steps as shown in figures 1-7:
the method comprises the following steps: and respectively performing groove machining on the sawtooth positions of the non-working surface of the blade 3 close to the side of the front disc 1, the working surface of the blade 3 close to the side of the rear disc 2 and the rear disc 2.
In the above steps, a single-side groove is formed on the non-working surface of the blade 3 close to the front disc 1, the groove angle is 50 degrees, and the truncated edge is 0.5 mm; a single-side groove is formed in the working surface of the blade 3 close to the side of the rear disc 2, the groove angle is 50 degrees, and the truncated edge is 2 mm; due to the consistent welding filling amount, the deformation of the welded blade can be reduced.
The back plate 2 is provided with a K-shaped asymmetric groove at the sawtooth part of the back plate 2 due to the plate thickness, the groove angle of the large groove side is 45 degrees, the groove angle of the small groove side is 55 degrees, and the truncated edge is 2 mm.
Step two: the impeller is integrally reinforced by adopting a rigid support, so that the impeller is prevented from deforming after being welded; wherein, the blade 3 is reinforced by the reinforcing plate 4; reinforcing the front disc 1 by adopting a process ring; and then the blades 3, the front disc 1 and the rear disc 2 are combined and molded.
In the above steps, in order to prevent the welding deformation of the perpendicularity of the blade 3, two reinforcing plates 4 are installed on the working surface of the blade 3 and fixed by spot welding.
The positioning welding of the blades 3 is welded on the non-groove side, and the positioning welding of the rear disc 2 is welded on the small groove side; wherein, when the positioning welding is carried out, manual electric arc welding is adopted, a welding rod with phi 4.0 is selected, and the welding current is 15% -20% larger than that during normal welding.
Step three: before welding, polishing the 50mm area of the groove side until the metallic luster is exposed, and then bottoming, filling and capping the weld joint by adopting carbon dioxide gas shielded welding on the groove side.
In the steps, an oxyacetylene gun is adopted to preheat the groove and two sides of the groove before welding, the groove is required to be heated to 150 ℃, and water stains and oil stains on the groove and the two sides of the groove are removed.
And after finishing the welding seam priming, polishing until the metallic luster is exposed, then filling, after finishing the filling, polishing until the metallic luster is exposed, and finally performing covering welding.
Step four: and (3) opening a groove on the non-groove side of the blade 3 through a carbon arc gouging, and then polishing.
In the above steps, the non-groove side of the blade 3 is provided with a U-shaped groove by a carbon arc air gouging, then root back chipping is carried out, and a metal air grinding head is used for grinding until the metal luster is exposed.
Step five: and (3) manually priming the non-groove side, polishing after priming, and then filling and capping by adopting carbon dioxide arc welding.
In the steps, a welding rod with the diameter of 3.2 is selected for priming, the welding current is 100-115A, and polishing treatment is carried out after priming is finished until the metallic luster is exposed.
Step six: and after welding, carrying out integral annealing stress removal treatment on the impeller.
In the steps, the whole impeller is heated to 560 ℃ along with the furnace, then the temperature in the furnace is kept at 560 ℃ for 4 hours, then the impeller is cooled to 200 ℃ along with the furnace, and finally the impeller is taken out of the furnace for air cooling, wherein flowing air is not allowed to exist in the cooling process; wherein all the process supports are disassembled after the heat treatment is finished.
Step seven: and (4) carrying out flaw detection after welding on the whole impeller by adopting ultrasonic waves and magnetic powder.
In the steps, a polishing wheel is used for polishing and grinding the welding seam and two sides of the welding bead, then ultrasonic flaw detection is carried out on the inner side of the welding seam, and then magnetic powder flaw detection is carried out on the surface.
The invention has the beneficial effects that:
1) according to the invention, the cover surface is filled by adopting carbon dioxide gas shielded welding, so that the welding efficiency is effectively improved.
2) The invention delays the abrasion speed of the impeller by improving the strength of the welding line, thereby prolonging the service life of the impeller.
3) The invention adopts a reasonable welding process to ensure the stability of the product quality.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should fall into the protection scope of the present invention without departing from the design concept of the present invention, and the technical contents of the present invention as claimed are all described in the technical claims.
Claims (7)
1. A welding method of a full penetration impeller is characterized by comprising the following steps:
the method comprises the following steps: a single-side groove is formed on the non-working surface of the blade close to the front disc, the angle of the groove is 50 degrees, and the truncated edge is 0.5 mm; a single-side groove is formed on the side, close to the rear disc, of the working surface of the blade, the angle of the groove is 50 degrees, and the truncated edge is 2 mm; forming a K-shaped asymmetric groove at the sawtooth part of the rear disc, wherein the groove angle of the large groove side is 45 degrees, the groove angle of the small groove side is 55 degrees, and the truncated edge is 2 mm;
step two: reinforcing the blades by adopting a reinforcing plate, and reinforcing the front disc by adopting a process ring; then combining and molding the blades, the front disc and the rear disc;
step three: before welding, polishing a 50mm area on the groove side until the metallic luster is exposed, and then bottoming, filling and capping the weld joint on the groove side by adopting carbon dioxide gas shielded welding;
step four: the non-groove side of the blade is provided with a groove through a carbon arc gouging, and then is polished;
step five: manually priming the non-groove side, polishing after priming, and then filling and capping by adopting carbon dioxide arc welding;
step six: after welding, carrying out integral annealing stress relief treatment on the impeller, integrally heating the impeller to 560 ℃ along with the furnace, then keeping the temperature in the furnace at 560 ℃ for 4 hours, cooling to 200 ℃ along with the furnace, and finally discharging from the furnace for air cooling;
step seven: and (4) carrying out flaw detection after welding on the whole impeller by adopting ultrasonic waves and magnetic powder.
2. A method of welding a full penetration impeller according to claim 1 wherein: in the second step, the tack welds of the blades are all welded on the non-groove side, and the tack weld of the rear disc is welded on the small groove side; and when in positioning welding, manual electric arc welding is adopted, a welding rod with phi 4.0 is selected, and the welding current is 15% -20% larger than that during normal welding.
3. A method of welding a full penetration impeller according to claim 1 wherein: in the third step, an oxyacetylene gun is adopted to preheat the groove and two sides of the groove before welding, the groove is required to be heated to 150 ℃, and water stains and oil stains on the groove and two sides of the groove are removed.
4. A method of welding a full penetration impeller according to claim 1 wherein: in the third step, after the welding seam is finished, polishing treatment is carried out until the metallic luster is exposed, then filling is carried out, after the filling is finished, polishing treatment is carried out until the metallic luster is exposed, and finally covering welding is carried out.
5. A method of welding a full penetration impeller according to claim 1 wherein: and in the fourth step, a carbon arc air gouging is adopted to open a U-shaped groove on the non-groove side of the blade, then root back chipping is carried out, and polishing treatment is carried out until the metallic luster is exposed.
6. A method of welding a full penetration impeller according to claim 1 wherein: in the fifth step, a welding rod with the diameter of 3.2 is selected for priming, the welding current is 100-115A, and polishing treatment is carried out after priming is finished until the metallic luster is exposed.
7. A method of welding a full penetration impeller according to claim 1 wherein: and seventhly, polishing and grinding the welding seam and two sides of the welding bead by using a polishing wheel, then carrying out ultrasonic flaw detection on the inner side of the welding seam, and then carrying out magnetic powder flaw detection on the surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910358268.5A CN110000522B (en) | 2019-04-30 | 2019-04-30 | Welding method of full penetration impeller |
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| CN201910358268.5A CN110000522B (en) | 2019-04-30 | 2019-04-30 | Welding method of full penetration impeller |
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| CN110000522A CN110000522A (en) | 2019-07-12 |
| CN110000522B true CN110000522B (en) | 2021-07-20 |
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| CN114918628B (en) * | 2022-06-20 | 2023-09-15 | 江苏金通灵鼓风机有限公司 | Manufacturing method of large closed tungsten carbide wear-resistant impeller |
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| CN1301820C (en) * | 2004-10-20 | 2007-02-28 | 南通金通灵风机有限公司 | Method for welding impellers in high strength and eliminating stress of impellers |
| CN1880776B (en) * | 2005-06-15 | 2010-06-09 | 赵世臣 | Process for producing fan impeller |
| CN100453818C (en) * | 2006-03-03 | 2009-01-21 | 山东大学 | Technological process of making wing type centrifugal vane whell |
| CN102764964B (en) * | 2012-08-03 | 2015-04-08 | 中冶南方(武汉)威仕工业炉有限公司 | Method for producing bell type furnace high-temperature circular fan impeller |
| CN104439635A (en) * | 2014-11-14 | 2015-03-25 | 句容五星机械制造有限公司 | Agitator blade welding process based on CO2 welding and manual welding |
| EP3023191A1 (en) * | 2014-11-20 | 2016-05-25 | Siemens Aktiengesellschaft | Turbine blade made of two parts |
| US9951632B2 (en) * | 2015-07-23 | 2018-04-24 | Honeywell International Inc. | Hybrid bonded turbine rotors and methods for manufacturing the same |
| CN106513998B (en) * | 2017-01-05 | 2018-02-16 | 机械科学研究总院青岛分院有限公司 | A kind of method for laser welding of titanium alloy blade |
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Address after: Chongchuan District Zhongxiu road 226001 Jiangsu city of Nantong Province, No. 135 Applicant after: Jintongling Technology Group Co., Ltd. Address before: Chongchuan District Zhongxiu road 226001 Jiangsu city of Nantong Province, No. 135 Applicant before: Jiangsu Jintongling Fluid Machinery Technology Co., Ltd. |
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