CN116727855A - Laser stitch welding process for B column of automobile - Google Patents
Laser stitch welding process for B column of automobile Download PDFInfo
- Publication number
- CN116727855A CN116727855A CN202310967522.8A CN202310967522A CN116727855A CN 116727855 A CN116727855 A CN 116727855A CN 202310967522 A CN202310967522 A CN 202310967522A CN 116727855 A CN116727855 A CN 116727855A
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- Prior art keywords
- laser
- sample plate
- welding
- stitch welding
- welding process
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- 238000003466 welding Methods 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 11
- 239000011261 inert gas Substances 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000013001 point bending Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material 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
- 238000004080 punching Methods 0.000 description 1
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
-
- 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
-
- 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
- B23K26/70—Auxiliary operations or equipment
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides an automobile B column laser stitch welding process, which comprises the following steps: the technological parameters of the laser stitch welding equipment are set, and the method specifically comprises the following steps: the rated power of the laser welding head is 3900-4000kw, the spot diameter of the laser welding head is 1-1.5mm, the focal length of the laser welding head is 250-300mm, the shielding gas is inert gas, and the transverse moving speed of the laser welding head is 0.78-1m/s; the longitudinal swing amplitude is 1.1-1.3mm, and the swing frequency is 250-260Hz; the first sample plate and the second sample plate are placed on the workbench, so that the two samples are mutually clung, the transverse length of the overlapped area is 1.5m, the longitudinal length is 5-10mm, and the thickness is 5mm. Laser welded hot formed steel is used instead of conventional high strength steel cold stamped parts and spot welded. Solves the problems that the high-strength steel cold-punched piece is subject to material thickness, rebound deformation and cracking after punch forming and the like.
Description
Technical Field
The invention relates to a stitch welding process, and belongs to an automobile B column laser stitch welding process.
Background
The prior art uses conventional spot welding. Subject to material and sheet thickness. The welding of the 1.5m length hot formed steel has poor mechanical property and large heat input when in spot welding. And is prone to spot welding failure risk. The laser welding seam has strong mechanical property. And the structural design is simple. Greatly reduces the production cost. However, in the prior art, the welding effect on the hot formed steel with the length of 1.5m is poor due to poor proportioning of technological parameters, and the mechanical property is poor.
Disclosure of Invention
The invention aims to provide an automobile B column laser stitch welding process for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a laser stitch welding process for an automobile B column,
a laser stitch welding apparatus comprising:
a workbench for placing a sample,
a pressing device positioned above the workbench and
the laser welding head is positioned above the pressing device and driven by a mechanical arm;
the method comprises the following steps:
the technological parameters of the laser stitch welding equipment are set, and the method specifically comprises the following steps:
the rated power of the laser welding head is 3900-4000kw, the spot diameter of the laser welding head is 1-1.5mm, the focal length of the laser welding head is 250-300mm, the shielding gas is inert gas, and the transverse moving speed of the laser welding head is 0.78-1m/s; the longitudinal swing amplitude is 1.1-1.3mm, and the swing frequency is 250-260Hz;
the first sample plate and the second sample plate are placed on the workbench and fixed by the pressing device, so that two samples are mutually clung, the thickness of the first sample plate and the thickness of the second sample plate are 2.5mm, the first sample plate is arranged above the second sample plate, the overlapping area of the first sample plate and the second sample plate is welded by the laser welding head, and the transverse length of the overlapping area is 1.5m, the longitudinal length is 5-10mm, and the thickness is 5mm.
Further, the welding step further includes performing 10 equidistant spot welds on the overlapping area.
Further, segment welding is carried out on the overlapped area after the spot welding is finished.
Further, the welding direction is opposite to the growing direction of the whole welding seam.
Further, the weld bead fusion width of the overlapping area is not less than 2.0mm, and the second sample plate fusion depth is not less than 1.25mm.
Further, the compressing device is a pneumatic cylinder for press fitting.
Further, the inert gas is one of argon, helium and carbon dioxide.
Further, the flow rate of the shielding gas is 25-30L/min.
Further, the first sample plate and the second sample plate are hot formed steel plates.
The invention has the beneficial effects that: laser welded hot formed steel is used instead of conventional high strength steel cold stamped parts and spot welded. Solves the problems that the high-strength steel cold-punched piece is subject to material thickness, rebound deformation and cracking after punch forming and the like. The laser welding perfectly solves the problems of product precision, cracking, simplified structure and light weight. And the mechanical property of the product is also obviously improved. Not only increases the thickness of the plate, but also increases the mechanical property of the B column of the automobile. The mechanical property of the welding line is increased. And the whole precision of the product is improved, and the problem of punching resilience does not occur. The effect of light weight is achieved, and the current development condition is met.
The foregoing description is only an overview of the present invention, and is intended to provide a more thorough understanding of the present invention, and is to be accorded the full scope of the present invention.
Drawings
FIG. 1 is a schematic view of a laser stitch welding apparatus according to the present invention.
FIG. 2 is a schematic view of the overlapping area of the present invention.
FIG. 3 shows the results of the three-point bending test of example 1 of the present invention.
FIG. 4 shows the results of the three-point bending test of example 2 of the present invention.
Reference numerals:
1-a laser welding head, 2-a pressing device and 3-a workbench; 4-overlap region, 5-spot welded spot, 6-first sample plate, 7-second sample plate.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
A laser stitch welding process for an automobile B column adopts laser stitch welding equipment, comprising the following steps:
a workbench 3 for placing a sample,
and the pressing device 2 is positioned above the workbench 3 and used for fixing the first sample plate 6 and the second sample plate 7, clamping and pressing the first sample plate and the second sample plate by a pneumatic cylinder. The first sample plate 6 and the second sample plate 7 are thermoformed steel plates.
The laser welding head 1 is arranged above the pressing device 2 and driven by a mechanical arm, can move along the transverse direction (A direction in figure 2) and the longitudinal direction (B direction in figure 2),
the method comprises the following steps:
the technological parameters of the laser stitch welding equipment are set, and the method specifically comprises the following steps:
the rated power of the laser welding head 1 is 3900-4000kw, which can be 3900KW,4000KW or any value in the middle, the high-strength welding effect of the invention can be achieved, the spot diameter is 1-1.5mm, the focal length is 250-300mm, the shielding gas is inert gas, and the flow rate of the shielding gas is 25-30L/min. The inert gas is one of argon, helium and carbon dioxide. The transverse moving speed of the laser welding head 1 is 0.78-1m/s; the longitudinal swing amplitude is 1.1-1.3mm, and the swing frequency is 250-260Hz;
the first sample plate 6 and the second sample plate 7 are placed on the workbench 3 and fixed by the pressing device 2, so that two samples are mutually clung, the thickness of the first sample plate 6 and the thickness of the second sample plate 7 are 2.5mm, the first sample plate 6 is above the second sample plate 7, the overlapping area 5 of the first sample plate 6 and the second sample plate 7 is welded by the laser welding head 1, the transverse length (A direction in fig. 2) of the overlapping area 5 is 1.5m, the longitudinal length (B direction in fig. 2) is 5-10mm, and the thickness is 5mm.
The welding step further comprises 10 equidistant spot welds of the overlap area 5. Spot welded point 4, as shown in fig. 2.
And carrying out segment welding on the overlapped area 5 after the point welding is finished. The welding direction is opposite to the growing direction of the whole welding seam.
The welding seam width of the overlapped area 5 is not less than 2.0mm, can be 2.1mm,2.3mm and 2.5mm, and the welding seam depth of the second sample plate 7 is not less than 1.25mm, can be 1.35mm and 1.40mm.
The invention is further illustrated below in connection with specific examples, the data in which are preferred results, but are not intended to limit the data of the invention.
Example 1
A laser stitch welding process for an automobile B column adopts laser stitch welding equipment, comprising the following steps:
a workbench 3 for placing a sample,
and the pressing device 2 is positioned above the workbench 3 and used for fixing the first sample plate 6 and the second sample plate 7, clamping and pressing the first sample plate and the second sample plate by a pneumatic cylinder. The first sample plate 6 and the second sample plate 7 are thermoformed steel plates.
The laser welding head 1 is arranged above the pressing device 2 and driven by a mechanical arm, can move along the transverse direction (A direction in figure 2) and the longitudinal direction (B direction in figure 2),
the method comprises the following steps:
the technological parameters of the laser stitch welding equipment are set, and the method specifically comprises the following steps:
the rated power of the laser welding head 1 is 3900kw, the spot diameter is 1.5mm, the focal length is 250mm, the shielding gas is inert gas, and the flow rate of the shielding gas is 25L/min. The inert gas is argon. The transverse moving speed of the laser welding head 1 is 0.78m/s; the longitudinal swing amplitude is 1.1mm, a circle with the diameter of 1.1mm is formed, and the swing frequency is 260Hz;
the first sample plate 6 and the second sample plate 7 are placed on the workbench 3 and fixed by the pressing device 2, so that two samples are mutually clung, the thickness of the first sample plate 6 and the thickness of the second sample plate 7 are 2.5mm, the first sample plate 6 is above the second sample plate 7, the overlapping area 5 of the first sample plate 6 and the second sample plate 7 is welded by the laser welding head 1, and the transverse length (A direction in fig. 2) of the overlapping area 5 is 1.5m, the longitudinal length (B direction in fig. 2) is 5mm, and the thickness is 5mm.
The welding step further comprises 10 equidistant spot welds of the overlap area 5.
And carrying out segment welding on the overlapped area 5 after the point welding is finished. The welding direction is opposite to the growing direction of the whole welding seam.
The weld width of the overlapping area 5 is 2.38mm, and the penetration of the second sample plate 7 is 1.36mm.
Example 2
A laser stitch welding process for an automobile B column adopts laser stitch welding equipment, comprising the following steps:
a workbench 3 for placing a sample,
and the pressing device 2 is positioned above the workbench 3 and used for fixing the first sample plate 6 and the second sample plate 7, clamping and pressing the first sample plate and the second sample plate by a pneumatic cylinder. The first sample plate 6 and the second sample plate 7 are thermoformed steel plates.
The laser welding head 1 is arranged above the pressing device 2 and driven by a mechanical arm, can move along the transverse direction (A direction in figure 2) and the longitudinal direction (B direction in figure 2),
the method comprises the following steps:
the technological parameters of the laser stitch welding equipment are set, and the method specifically comprises the following steps:
the rated power of the laser welding head 1 is 3900kw, the spot diameter is 1.5mm, the focal length is 250mm, the shielding gas is inert gas, and the flow rate of the shielding gas is 25L/min. The inert gas is argon. The transverse moving speed of the laser welding head 1 is 1m/s; the longitudinal swing amplitude is 1.3mm, a circle with the diameter of 1.3mm is formed, and the swing frequency is 250Hz;
the first sample plate 6 and the second sample plate 7 are placed on the workbench 3 and fixed by the pressing device 2, so that two samples are mutually clung, the thickness of the first sample plate 6 and the thickness of the second sample plate 7 are 2.5mm, the first sample plate 6 is above the second sample plate 7, the overlapping area 5 of the first sample plate 6 and the second sample plate 7 is welded by the laser welding head 1, and the transverse length (A direction in fig. 2) of the overlapping area 5 is 1.5m, the longitudinal length (B direction in fig. 2) is 5mm, and the thickness is 5mm.
The welding step further comprises 10 equidistant spot welds of the overlap area 5.
And carrying out segment welding on the overlapped area 5 after the point welding is finished. The welding direction is opposite to the growing direction of the whole welding seam.
The weld width of the overlapping area 5 is 2.45mm, and the penetration of the second sample plate 7 is 1.42mm.
The samples obtained in example 1 and example 2 were subjected to a three-point bending test, and the test method was referred to as "GB/T232-2010" metal material bending test method. The test results are shown in fig. 3 and 4.
As can be seen from fig. 3-4, the stitch welded sample using the processing technique of the present invention has good mechanical properties.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A laser stitch welding process for an automobile B column is characterized in that,
a laser stitch welding apparatus comprising:
a workbench for placing a sample,
a pressing device positioned above the workbench and
the laser welding head is positioned above the pressing device and driven by a mechanical arm;
the method comprises the following steps:
the technological parameters of the laser stitch welding equipment are set, and the method specifically comprises the following steps:
the rated power of the laser welding head is 3900-4000kw, the spot diameter of the laser welding head is 1-1.5mm, the focal length of the laser welding head is 250-300mm, the shielding gas is inert gas, and the transverse moving speed of the laser welding head is 0.78-1m/s; the longitudinal swing amplitude is 1.1-1.3mm, and the swing frequency is 250-260Hz;
the first sample plate and the second sample plate are placed on the workbench and fixed by the pressing device, so that two samples are mutually clung, the thickness of the first sample plate and the thickness of the second sample plate are 2.5mm, the first sample plate is arranged above the second sample plate, the overlapping area of the first sample plate and the second sample plate is welded by the laser welding head, and the transverse length of the overlapping area is 1.5m, the longitudinal length is 5-10mm, and the thickness is 5mm.
2. The automotive B-pillar laser stitch welding process as recited in claim 1 in which said welding step further comprises 10 equidistant spot welds of said overlap area.
3. A car B-pillar laser stitch welding process as described in claim 2, wherein said overlap area after the stitch welding is performed with segment welding.
4. A car B-pillar laser stitch welding process as described in claim 3, wherein the welding direction is opposite to the whole weld growth direction.
5. The automotive B-pillar laser stitch welding process as recited in claim 1 in which the weld width of the overlap region is not less than 2.0mm and the second sample plate penetration is not less than 1.25mm.
6. The automotive B-pillar laser stitch welding process as recited in claim 1 in which said hold-down means is a pneumatic cylinder press-fit.
7. The automotive B-pillar laser stitch welding process as recited in claim 1 in which the inert gas is one of argon, helium, and carbon dioxide.
8. The automotive B-pillar laser stitch welding process as recited in claim 7 in which the shielding gas flow is 25-30L/min.
9. The automotive B-pillar laser stitch welding process as recited in claim 1 in which the first and second sample plates are hot formed steel plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310967522.8A CN116727855A (en) | 2023-08-03 | 2023-08-03 | Laser stitch welding process for B column of automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310967522.8A CN116727855A (en) | 2023-08-03 | 2023-08-03 | Laser stitch welding process for B column of automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116727855A true CN116727855A (en) | 2023-09-12 |
Family
ID=87918887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310967522.8A Pending CN116727855A (en) | 2023-08-03 | 2023-08-03 | Laser stitch welding process for B column of automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116727855A (en) |
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2023
- 2023-08-03 CN CN202310967522.8A patent/CN116727855A/en active Pending
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