CN112427809A - Welding method for high-pressure fuel pump - Google Patents
Welding method for high-pressure fuel pump Download PDFInfo
- Publication number
- CN112427809A CN112427809A CN202011065742.4A CN202011065742A CN112427809A CN 112427809 A CN112427809 A CN 112427809A CN 202011065742 A CN202011065742 A CN 202011065742A CN 112427809 A CN112427809 A CN 112427809A
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- China
- Prior art keywords
- welding
- pressure fuel
- fuel pump
- high pressure
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 130
- 239000000446 fuel Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 3
- 230000004927 fusion Effects 0.000 abstract description 9
- 230000035515 penetration Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/03—Observing, e.g. monitoring, the workpiece
- B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/044—Seam tracking
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
Abstract
The invention discloses a welding method of a high-pressure fuel pump, which comprises the following steps: step one, determining materials of a pump body and parts; step two, determining welding parameters; thirdly, positioning a welding track; step four, selecting welding parameters for welding; and step five, finishing welding. The invention adopts laser welding to replace the friction welding which is traditionally used in the field, determines welding parameters and positions welding tracks according to different materials of a pump body and parts, carries out path compensation in the welding process and finally completes the whole welding process. The welded high-pressure fuel pump has no cracks, the penetration and fusion width meet the technical requirements, the welding seam is ensured not to deviate, and no leakage is ensured under the pressure resistance test.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a welding method of a high-pressure fuel pump.
Background
The friction welding mode is generally adopted in the existing metal product processing, the friction welding utilizes heat generated by friction of a workpiece contact surface as a heat source to enable the workpiece to generate plastic deformation under the action of pressure for welding, a heat affected zone of the friction welding is obviously larger, and materials can have potential deformation. Welding cannot be achieved without allowing movement between the welded materials. The high-pressure fuel pump is assembled and sealed when the valve core assembly and the pump body are welded, the angle of the support is required to be fixed, sub-parts are integrated inside the pump cover when the pump cover is welded, and the procedures can not be realized by friction welding.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the technical scheme that: the welding method of the high-pressure fuel pump comprises the following steps: step one, determining materials of a pump body and parts; step two, determining welding parameters; thirdly, positioning a welding track; step four, selecting welding parameters for welding; and step five, finishing welding.
Preferably, in the above technical solution, the high pressure fuel pump is laser welded.
Preferably, in the third step, a vision system is adopted to sample the high-pressure fuel pump and then position the welding track.
Preferably, in the fourth step, the welding track and the actual weld joint are checked by using a vision system, and path compensation is performed when the weld joint deviates.
Preferably, the welding parameters include welding power, defocus, welding speed, and shielding gas flow rate.
Preferably, the pump body and the parts are both made of 1.4418/X4CrNiMo16-5-1, the defocusing amount in the second step is-6, the welding speed is 6m/min, and the welding power is 1700W.
Preferably, the pump body and the parts are made of 430F steel, the defocusing amount in the second step is-6, the welding speed is 6m/min, and the welding power is 1400W.
The invention has the beneficial effects that: the invention adopts laser welding to replace the friction welding which is traditionally used in the field, determines welding parameters and positions welding tracks according to different materials of a pump body and parts, carries out path compensation in the welding process and finally completes the whole welding process. The welded high-pressure fuel pump has no cracks, the penetration and fusion width meet the technical requirements, the welding seam is ensured not to deviate, and no leakage is ensured under the pressure resistance test.
Drawings
FIG. 1 is a flow chart of a high pressure fuel pump welding process;
FIG. 2 is a comparison of welds at different welding powers according to an embodiment;
FIG. 3 is a comparison of welds at different shielding gas rates for one example;
FIG. 4 is a comparison of welds at two different welding powers for the examples.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
1. As shown in figure 1, in the welding method of the high-pressure fuel pump, a pump body and parts are all made of 430F steel, and according to the characteristics of 1.4418/X4CrNiMo16-5-1 materials, the welding parameters are determined as follows: the defocusing amount is-6, the welding speed is 6m/min, and the welding power is 1700W. Laser welding is employed and a robot is used as a motion system. A vision system is adopted to position a welding track after sampling the high-pressure fuel pump and track the welding process in real time, the condition that a welding line has deviation is found, and path compensation is carried out on the original track until the whole welding is completed. Compared with the welding seam of the high-pressure fuel pump welded under the same conditions and the welding power of 1400W, the welding seam of the welded high-pressure fuel pump has the advantage that the power of 1700W is larger than the fusion width and the fusion depth of 1400W as shown in FIG. 2. Defocusing amount influences the concentration of laser energy, negative defocusing is selected when welding materials are thick, the depth of a welding seam can be well maintained, and generally, the larger the defocusing amount is, the wider the welding seam fusion width is. Too fast a welding speed may result in incomplete melting of the material, especially in cracks formed when the material is inconsistent between the welded pump body and other parts. When the welding speed is higher than 8m/min, cracks exist in the welding line, and in multiple experiments, the fact that the welding speed is too high, the cooling speed of the welding line temperature is too high, the metallographic structure at the welding line is not dense, the melting is not thorough, and the fracture occurs under natural cooling or stress is found. In order to avoid cracks, the welding speed must be reduced while ensuring the welding efficiency to ensure complete fusion of the weld. Welding power and welding speed are in inverse proportion, welding energy can be improved by improving the welding power under the condition that the welding speed is not changed, weld penetration and weld width are improved, and vice versa, welding efficiency can be improved by proper welding speed and welding power, and the product percent of pass is guaranteed. The whole welding process is influenced by the shielding gas, the gas needs to be stably output, the temperature of the welding seam is reduced when the welding seam is formed by the shielding gas, so that the pump body and parts are fused and integrally formed into the welding seam, and meanwhile, the shielding gas can blow out plasma floating on the surface of the welding seam to ensure the tidiness and attractiveness of the welding seam. When the protective gas velocity is high, the fused part at the welding seam can be blown out, and the surface of the welding seam is fluctuated; when the shielding gas velocity is low, the plasma on the surface of the welding line is not blown out in time, so that the welding line is blackened. The temperature of a molten pool can be influenced by the flow velocity of the protective gas flow, so that the penetration depth, the fusion width and the surface appearance of a welding seam are caused, the product yield is influenced, and the welding seam at different flow velocities is shown in figure 3 under the conditions of power 2050W, defocusing amount of-6 and speed of 6 m/min. The welding seams formed by different pump bodies with the same welding parameters are deviated, the melting point of the material 1.4418 is higher than that of the material 430F, and the welding seams are always deviated to the side with the lower melting point in a plurality of tests, so that welding compensation quantity is needed to correct welding to ensure that the welding seams are not deviated.
Example two
As shown in fig. 1, the pump body and the parts are made of 430F steel, and according to the characteristics of the 430F steel, the welding parameters are determined as follows: the defocusing amount is-6, the welding speed is 6m/min, and the welding power is 1700W. Laser welding is employed and a robot is used as a motion system. A vision system is adopted to position a welding track after sampling the high-pressure fuel pump and track the welding process in real time, the condition that a welding line has deviation is found, and path compensation is carried out on the original track until the whole welding is completed. Compared with the welding seam of the high-pressure fuel pump welded under the same conditions and the welding power of 1400W, the welding seam of the welded high-pressure fuel pump has the advantage that the power of 1700W is larger than the fusion width and the fusion depth of 1400W as shown in FIG. 4.
It should be noted that the technical features of the laser welding, the vision system, the robot, etc. related to the present patent application should be regarded as the prior art, and the specific structure, the operation principle, and the control manner and the spatial arrangement manner that may be related to the technical features should be selected conventionally in the field, and should not be regarded as the point of the present patent, and the present patent is not further specifically described in detail.
Having described preferred embodiments of the present invention in detail, it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The welding method of the high-pressure fuel pump is characterized by comprising the following steps of: step one, determining materials of a pump body and parts; step two, determining welding parameters; thirdly, positioning a welding track; step four, selecting welding parameters for welding; and step five, finishing welding.
2. A method of welding a high pressure fuel pump as set forth in claim 1, wherein said high pressure fuel pump is laser welded.
3. The method for welding a high pressure fuel pump of claim 2, wherein a vision system is used in the third step to locate the welding trajectory after sampling the high pressure fuel pump.
4. The welding method for a high pressure fuel pump of claim 2, wherein the fourth step uses a vision system to check the welding track with the actual weld, and path compensation is performed when the weld deviates.
5. A method of welding a high pressure fuel pump as set forth in claim 2, wherein said welding parameters include welding power, defocus, welding speed, shielding gas flow rate.
6. The welding method of the high pressure fuel pump of claim 5, wherein the pump body and the parts are made of 1.4418/X4CrNiMo16-5-1, the defocusing amount in the second step is-6, the welding speed is 6m/min, and the welding power is 1700W.
7. A method for welding a high pressure fuel pump as set forth in claim 5, wherein said pump body and said parts are made of 430F steel, and in step two, the defocusing amount is-6, the welding speed is 6m/min, and the welding power is 1400W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011065742.4A CN112427809A (en) | 2020-09-30 | 2020-09-30 | Welding method for high-pressure fuel pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011065742.4A CN112427809A (en) | 2020-09-30 | 2020-09-30 | Welding method for high-pressure fuel pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112427809A true CN112427809A (en) | 2021-03-02 |
Family
ID=74689656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011065742.4A Pending CN112427809A (en) | 2020-09-30 | 2020-09-30 | Welding method for high-pressure fuel pump |
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| Country | Link |
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| CN (1) | CN112427809A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11270438A (en) * | 1998-03-20 | 1999-10-05 | Keihin Corp | Manufacture of electromagnetic type fuel injection valve |
| US6409102B1 (en) * | 1999-03-15 | 2002-06-25 | Aerosance, Inc. | Fuel injector assembly |
| CN101178043A (en) * | 2006-11-08 | 2008-05-14 | Ti集团自动推进系统有限责任公司 | Fuel pump and filter assembly |
| CN203649649U (en) * | 2013-12-12 | 2014-06-18 | 北汽福田汽车股份有限公司 | Automatic welding platform and system |
| EP2777864A1 (en) * | 2013-03-14 | 2014-09-17 | BSH Bosch und Siemens Hausgeräte GmbH | Method of connecting two panels of sheet metal of a household appliance using overlapping laser welding of different stainless steels; corresponding household appliance |
| KR20160016348A (en) * | 2014-08-05 | 2016-02-15 | 주식회사 코아비스 | Laser welding structure |
| US20180193951A1 (en) * | 2015-07-08 | 2018-07-12 | Hitachi Automotive Systems, Ltd. | Laser welding method, high pressure fuel supply pump, and fuel injection valve |
-
2020
- 2020-09-30 CN CN202011065742.4A patent/CN112427809A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11270438A (en) * | 1998-03-20 | 1999-10-05 | Keihin Corp | Manufacture of electromagnetic type fuel injection valve |
| US6409102B1 (en) * | 1999-03-15 | 2002-06-25 | Aerosance, Inc. | Fuel injector assembly |
| CN101178043A (en) * | 2006-11-08 | 2008-05-14 | Ti集团自动推进系统有限责任公司 | Fuel pump and filter assembly |
| EP2777864A1 (en) * | 2013-03-14 | 2014-09-17 | BSH Bosch und Siemens Hausgeräte GmbH | Method of connecting two panels of sheet metal of a household appliance using overlapping laser welding of different stainless steels; corresponding household appliance |
| CN203649649U (en) * | 2013-12-12 | 2014-06-18 | 北汽福田汽车股份有限公司 | Automatic welding platform and system |
| KR20160016348A (en) * | 2014-08-05 | 2016-02-15 | 주식회사 코아비스 | Laser welding structure |
| US20180193951A1 (en) * | 2015-07-08 | 2018-07-12 | Hitachi Automotive Systems, Ltd. | Laser welding method, high pressure fuel supply pump, and fuel injection valve |
Non-Patent Citations (8)
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| 上海隆继: "汕头EN 1.4418成分分析_环保在线 (hbzhan.com)", 《环保在线》 * |
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Application publication date: 20210302 |
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