CN115070252A - Lock bottom welding joint - Google Patents
Lock bottom welding joint Download PDFInfo
- Publication number
- CN115070252A CN115070252A CN202210710302.2A CN202210710302A CN115070252A CN 115070252 A CN115070252 A CN 115070252A CN 202210710302 A CN202210710302 A CN 202210710302A CN 115070252 A CN115070252 A CN 115070252A
- Authority
- CN
- China
- Prior art keywords
- lock bottom
- bottom piece
- lock
- welding
- joint
- 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.)
- Granted
Links
- 238000003466 welding Methods 0.000 title abstract description 39
- 238000000034 method Methods 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002594 fluoroscopy Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007789 sealing 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
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a lock bottom welding joint which comprises a lock bottom piece and a lock bottom piece, wherein the bevel angle a of the lock bottom piece is 35-45 degrees, the width d of a truncated edge of the lock bottom piece is 1.4-1.6mm, and the thickness h of the truncated edge of the lock bottom piece is 0.8-1.0 mm; the locked bottom piece is connected with the lock bottom piece. The invention not only ensures the stable and reliable quality of the welding seam of the product, but also improves the assembly precision of the product parts, and has wide application prospect and obvious economic and social benefits.
Description
Technical Field
The invention belongs to the field of machining, and relates to a lock bottom welding joint.
Background
The oil tank cabin shell mainly comprises an N-section oil tank and an end frame; the oil tank is connected and welded with the oil tank through the end frame to form an independent closed chamber, the cross section of the oil tank is approximately in a non-equilateral hexagonal structure, the overall length of the shell of the oil tank is about 3346mm, the number of welding lines is up to more than 10, and the diameter of the outer envelope of the outline of the end frame is phi 640 mm; the oil tank is mainly made of 5A06 aluminum alloy, the thickness of the position to be welded is 4mm, and the welding method adopts manual argon tungsten-arc welding. The requirements on the overall form and position tolerance, the dimensional precision, the box body sealing property and the welding seam quality of the design drawing subjected to butt welding are high; if the welding joint structure adopts a conventional butted I-shaped structure, the assembly precision of the oil tank shell is poor, the welding is enlarged, and the integral precision requirement of the oil tank shell is difficult to ensure. Therefore, in order to ensure the assembly precision and welding deformation control of the joint, a lock bottom structure needs to be selected for the welding joint form of the oil tank shell, the traditional lock bottom welding joint is adopted for welding, the welding seam is easy to have welding defects such as cracks, incomplete fusion, incomplete penetration and chain-shaped air hole inclusion, and the design index and the product performance requirements cannot be met.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a lock bottom welding joint. The joint structure is convenient to process and weld, has few welding defects and high qualification rate, and the strength of the welded joint meets the I-level butt weld strength required by the welding technical standard.
In order to achieve the purpose, the invention adopts the following technical scheme:
a lock bottom welding joint comprises a lock bottom piece and a lock bottom piece, wherein the bevel angle a of the lock bottom piece is 35-45 degrees, the width d of the truncated edge of the lock bottom piece is 1.4-1.6mm, and the thickness h of the truncated edge of the lock bottom piece is 0.8-1.0 mm; the locked bottom piece is connected with the lock bottom piece.
Preferably, the truncated edge of the lock bottom piece is provided with a semicircular hole.
More preferably, the diameter of the semicircular hole is 2 mm.
More preferably, the semicircular holes are provided in plurality, and the hole distance is 5 mm.
During welding forming, the structural size reasonableness of the welding groove directly influences the quality of the welding seam and the welding deformation, the groove angle is too small, more welding defects are easy to generate, and the groove angle is too large, and larger welding deformation is easy to generate. The optimal groove angle of 35-45 degrees is determined by combining the welding thickness of the base metal of the oil tank shell with the test effect, wherein the welding thickness is 4 mm; according to the test result, the width of the truncated edge is determined to be 1.5mm +/-0.1, and the thickness is determined to be 0.8-1.0 mm. The method aims to ensure that the back weld joint of the manual argon tungsten-arc welding weld metal molten pool is well formed in the crystallization process, and prevent the poor formation and fusion of the back weld joint caused by different heat dissipation speeds due to the thickness difference of two sides of the weld metal molten pool; a phi 2mm drill bit is adopted on the blunt edge of the lock bottom joint to form semicircular holes with the hole distance of 5mm, and the aim is to form an arc perforation effect in the manual tungsten electrode argon arc welding process, so that the weld line fusion line can be fused sufficiently, the generation of linear defects such as air hole inclusion and the like can be prevented, the good forming of the weld line can be ensured under a small current, and the loose weld line structure and the coarse crystal grains can be reduced.
The invention has the following advantages:
the invention is suitable for regular pipeline structural members and is also suitable for assembly welding of special-shaped structural members. The invention is successfully applied to the assembly welding of the lock bottom structure of the aerospace product at present; the method not only ensures the stable and reliable quality of the welding seam of the product, but also improves the assembly precision of the product parts, and has wide application prospect and remarkable economic and social benefits.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the lock base structure;
FIG. 3 is a schematic view of a lock base member being semi-circular;
fig. 4 is a schematic view of the structure of the locked bottom.
Wherein: locking bottom piece 1, locked bottom piece 2.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
a lock bottom welding joint comprises a lock bottom piece and a lock bottom piece, wherein the bevel angle a of the lock bottom piece is 35-45 degrees, the width d of the truncated edge of the lock bottom piece is 1.4-1.6mm, and the thickness h of the truncated edge of the lock bottom piece is 0.8-1.0 mm; the locked bottom piece is connected with the lock bottom piece. And a semicircular hole is formed in the truncated edge of the lock bottom piece. The diameter of the semicircular hole is 2 mm. The semicircle orifice is equipped with a plurality ofly, and the pitch-row is 5 mm.
The specific production flow is as follows:
1) performing numerical control machining on the size of the lock bottom piece, and manufacturing a semi-circular hole with the diameter of 2mm on the blunt edge; numerically controlling and processing the locked bottom piece; 2) assembling a bottom locking piece and a bottom locking piece, ensuring that the assembling clearance is less than or equal to 0.5mm and the misalignment is less than or equal to 0.5mm, polishing and cleaning an oxide film on the surface of a lock bottom joint by adopting a clean copper wire wheel with the diameter of 100mm before assembling, and cleaning surface aluminum powder by using dust-free cloth dipped with alcohol to prevent hydrogen elements and a high-melting-point aluminum oxide (Al2O3) film on the surface of the lock bottom joint from being brought into a weld metal molten pool in the welding process to form linear air hole inclusions; 3) welding and X-ray fluoroscopy of the welded joint were performed according to the parameters of Table 1.
Table 1: manual tungsten electrode argon arc welding parameter statistical table
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (4)
1. The utility model provides a lock end welded joint which characterized in that: the lock bottom piece comprises a lock bottom piece and a lock bottom piece, wherein the bevel angle a of the lock bottom piece is 35-45 degrees, the width d of the truncated edge of the lock bottom piece is 1.4-1.6mm, and the thickness h of the truncated edge of the lock bottom piece is 0.8-1.0 mm; the locked bottom piece is connected with the lock bottom piece.
2. A lock bottom weld joint as defined in claim 1 wherein: and a semicircular hole is formed in the truncated edge of the lock bottom piece.
3. A lock bottom weld joint as defined in claim 2 wherein: the diameter of the semicircular hole is 2 mm.
4. A lock bottom weld joint as defined in claim 2 wherein: the semicircle orifice is equipped with a plurality ofly, and the pitch-row is 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210710302.2A CN115070252B (en) | 2022-06-22 | 2022-06-22 | Lock bottom welding joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210710302.2A CN115070252B (en) | 2022-06-22 | 2022-06-22 | Lock bottom welding joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115070252A true CN115070252A (en) | 2022-09-20 |
| CN115070252B CN115070252B (en) | 2023-11-03 |
Family
ID=83252534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210710302.2A Active CN115070252B (en) | 2022-06-22 | 2022-06-22 | Lock bottom welding joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115070252B (en) |
Citations (20)
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115070252B (en) | 2023-11-03 |
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