CN115383307A - Laser welding system, control device, program product and corresponding welding method - Google Patents
Laser welding system, control device, program product and corresponding welding method Download PDFInfo
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- CN115383307A CN115383307A CN202110498488.5A CN202110498488A CN115383307A CN 115383307 A CN115383307 A CN 115383307A CN 202110498488 A CN202110498488 A CN 202110498488A CN 115383307 A CN115383307 A CN 115383307A
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- laser
- weld
- laser welding
- welding
- cleaning step
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
- B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
-
- 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
- B23K26/702—Auxiliary equipment
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention particularly relates to the field of welding of stainless steel plates, and particularly relates to a method for laser welding of easily oxidized workpieces, which at least comprises the following steps: a laser welding step for laser welding the workpiece to generate a weld; and a laser cleaning step for performing laser surface cleaning at the weld to remove oxidation products generated during the laser welding operation at the weld. The invention also relates to a laser welding system (1) comprising: a laser emitting device (11) for generating a welding laser beam; and a control device (12) for controlling at least the laser emitting device (11) for laser welding the easily oxidized workpiece, wherein the laser welding system (1) is configured to be adapted to perform the method. A corresponding control device (12) for a laser welding system (1) and a corresponding computer program product are also described. The weld skin can be removed more reliably and more simply.
Description
Technical Field
The invention relates to a method for laser welding an oxidizable workpiece, a laser welding system, a control device for a laser welding system and a computer program product.
Background
Laser welding is an efficient and precise welding method using a laser beam with high energy density as a heat source. Laser welding is one of the important aspects of the application of laser material processing techniques. Laser welding has many advantages, such as minimizing the amount of heat required, a small range of metallurgical change in the heat affected zone, and low distortion due to heat conduction.
At present, the laser welding of stainless steel is very common. However, stainless steel is susceptible to oxidation during welding, which affects not only the appearance of the weld surface, but also the corrosion resistance of the surface. The existing solution is to blow a protective gas, such as nitrogen, argon and helium, during the welding process on the area being welded, so that the melt can be shielded from air during the welding process.
However, the use of shielding gases also has a number of disadvantages. For example, additional shielding gas costs and corresponding hardware costs are required. Especially under certain complex operating conditions, the protective gas cannot completely cover the weld melt, which would make the weld joint completely impervious to oxidation. In this case, the welding surface is no longer bright but is yellow or even black, which greatly affects the appearance of the welding surface and reduces the corrosion resistance.
For this reason, corresponding improvements are required.
Disclosure of Invention
It is an object of the present invention to provide an improved method for laser welding of oxidisable workpieces, a laser welding system, a control device for a laser welding system and a computer program product, which overcome at least one of the above-mentioned disadvantages.
According to a first aspect of the present invention, there is provided a method for laser welding an oxidisable workpiece, the method comprising at least the steps of: a laser welding step for laser welding the workpiece to generate a weld; and a laser cleaning step for performing laser surface cleaning at the weld to remove oxidation products generated during the laser welding operation at the weld.
According to an exemplary embodiment of the invention, the workpiece is a stainless steel plate; and/or the laser welding step and the laser cleaning step are performed using the same laser emitting device.
According to an exemplary embodiment of the invention, the laser welding step and the laser cleaning step are performed based on a ring-core tunable welding technique.
According to an exemplary embodiment of the present invention, the laser welding step is performed in a continuous scanning laser welding manner; and/or the laser cleaning step is carried out in a laser high-frequency oscillation continuous scanning mode.
According to an exemplary embodiment of the invention, the laser cleaning step is performed based only on an inner core in a ring-core tunable welding technique; and/or in the laser cleaning step, the laser beam oscillates in the width direction of the weld with an oscillation amplitude larger than the width of the weld.
According to an exemplary embodiment of the invention, the laser welding step and the laser cleaning step are performed by means of a scanning galvanometer; and/or the laser welding step is performed without a protective gas or with an insufficient protective gas.
According to a second aspect of the present invention, there is provided a laser welding system comprising: a laser emitting device for generating a welding laser beam; and a control device at least for controlling the laser emitting device to laser weld the easily oxidized workpiece; wherein the laser welding system is configured to perform the method.
According to an exemplary embodiment of the invention, the laser welding system further comprises a weld monitoring unit for monitoring the weld, the weld monitoring unit being communicatively connected to the control device for determining the operating parameters of the laser cleaning step based on the weld characteristics monitored by the weld monitoring unit.
According to a third aspect of the invention, a control device for a laser welding system is provided, wherein the control device is configured to be adapted to perform the method according to the invention.
According to a fourth aspect of the invention, a computer program product is provided, wherein the computer program product comprises computer program instructions which, when executed by a processor, implement the method.
According to certain exemplary embodiments of the present invention, the weld scale may be removed more reliably and more simply.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings include:
fig. 1 shows a schematic block diagram of a laser welding system for laser welding stainless steel plates according to an exemplary embodiment of the present invention.
Fig. 2 shows a schematic diagram of a method for welding stainless steel plates according to an exemplary embodiment of the present invention.
Fig. 3 shows a flow chart of a method for welding stainless steel plates according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous technical effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
Fig. 1 shows a schematic block diagram of a laser welding system for laser welding stainless steel plates according to an exemplary embodiment of the present invention.
As shown in fig. 1, the laser welding system 1 may include: a laser emitting device 11 for generating a welding laser beam, in particular a scanning welding laser beam, and a control device 12 for controlling at least the laser emitting device 11 for welding, in particular for continuous scanning welding, the stainless steel plate 2. The stainless steel plate 2 may, for example, be fixed to a table 3 during welding. The table 3 may be, for example, a jig.
It will be appreciated by those skilled in the art that the table 3 may also be controlled by the control device 12, for example, to adjust the position and/or orientation of the stainless steel plate 2, and in particular its position and/or orientation relative to the laser emitting device 11.
It will be understood by those skilled in the art that the laser welding system 1 according to the present invention may be fixed as a whole during welding, and only control the position where the laser beam is irradiated to the stainless steel plate 2 by means of the laser emitting device 11, for example, the optical device 111 thereof, so that continuous welding can be performed on the stainless steel plate 2. Under the condition, the problem of acceleration and deceleration of a linear motor in the traditional welding process does not exist, and the welding speed can be greatly improved, for example, the scanning welding speed can reach 10000 mm/s.
According to an exemplary embodiment of the present invention, laser emitting device 11 may be configured to operate based on a ring-core tunable welding technique. The adjustable welding technology of the ring core belongs to the technology of the applicant, and the two-in-one laser optical cable (LLK) is used for emitting laser beams to a workpiece to be processed, so that the adjustable welding technology has the advantages of reducing splashing, improving surface forming and the like. For clarity, specific details are not set forth herein.
According to an exemplary embodiment of the present invention, the laser welding system 1 may further comprise positioning means 13 at least for pre-welding pre-positioning, in order to be able to move/scan the laser beam in a predetermined manner with respect to the stainless steel plate 2, in particular to be able to adjust the incident position of the laser beam in real time depending on the position of the stainless steel plate 2 to avoid damaging the workpiece or the work table 3.
The controller of the laser emitting device 11 itself can also be considered as part of said control device 12. Even in some cases, the control device 12 may be integrated with the laser emitting device 11, for example, in the case of a scanning galvanometer (PFO). The invention is not limited in this regard.
According to an exemplary embodiment of the invention, the laser welding is performed with the application of a protective gas.
However, it has been found in practice that, for a number of reasons, it is not possible to ensure that the welded part (weld) is not oxidized, even if a protective gas is applied, in particular at locations not covered by the protective gas.
For this reason, according to an exemplary embodiment of the present invention, a surface cleaning step at the weld is performed by means of laser after the laser welding to remove the remaining oxidation products, thereby improving the appearance and corrosion resistance. Laser welding can be performed even without a protective gas due to the special surface cleaning step.
According to an exemplary embodiment of the present invention, said surface cleaning step is also performed by the laser welding system 1, in particular by the laser emitting device 11. The surface cleaning step may be performed with a coaxial inner core, especially where a ring-core based adjustable welding technique is used. The core fiber can produce high power density, high laser power, and high scanning speed especially under the cooperation of a scanning galvanometer, so that the welding skin can be removed quickly after the laser welding step. For example, the inner core may emit a laser beam having a diameter of 50 microns.
The cleaning depth of the surface cleaning step may be in the order of micrometers, which does not affect the raw material, i.e., the welding strength itself.
According to an exemplary embodiment of the present invention, in the case of using the ring core based adjustable welding technique, laser welding may be performed using a combination of an inner core and an outer core which are coaxial during welding, and surface cleaning may be performed using only a laser beam emitted from the inner core during a surface cleaning step. So that two items of completely different operations can be performed using the same laser transmitter 11. In particular, this allows the laser welding step and the laser cleaning step to be carried out using the same hardware, thereby eliminating the need for additional hardware, reducing hardware costs and equipment complexity. Switching between the two operating modes can be achieved by simple control of the control device 12.
Therefore, the invention creatively provides a novel laser welding method for the stainless steel plate. Fig. 2 shows a schematic diagram of a method for welding stainless steel plates according to an exemplary embodiment of the present invention.
As shown in fig. 2, a) is the case before welding of the stainless steel plates, b) is the case after the laser welding step of the stainless steel plates, c) is the case after removal of the welding skin by laser cleaning of the weld seam resulting from the laser welding in b) (the welding skin, i.e. the oxidation products resulting from the welding, is indicated by the schematic hatching 21 in the figure).
To this end, fig. 3 shows a flow chart of a method for welding stainless steel plates according to an exemplary embodiment of the present invention.
As shown in fig. 3, in step S1, a stainless steel plate is laser-welded to produce a bead. In step S2, laser surface cleaning is performed at the weld to remove oxidation products at the weld.
In step S1, continuous scanning laser welding may be performed. In step S2, laser surface cleaning may be performed by high-frequency oscillation scanning. That is, the laser beam oscillates in the width direction of the weld bead on the one hand, and scans along the length direction of the weld bead on the other hand, so that the oxidation products at the weld bead can be removed step by step.
According to an exemplary embodiment of the invention, in the laser cleaning step, the laser beam is oscillated over the width of the weld seam with an oscillation amplitude larger than the width of the weld seam in order to better peel off the welding skin such that the welding skin is more completely removed.
As mentioned above, both the laser welding step and the laser cleaning step may be performed by means of a scanning galvanometer, preferably by the same scanning galvanometer.
According to an exemplary embodiment of the present invention, the laser welding system 1 may further comprise a weld monitoring unit (not shown in the figures) for monitoring the weld, which may determine the characteristics of the weld formed in the laser welding step, in particular the width of the weld, and then transmit them to the control device 12, and the control device 12 may determine the working parameters, such as the oscillation amplitude, of the subsequent laser cleaning step according to the weld characteristics, so that the cleaning step may be automatically and reliably performed after the laser welding step. Of course, the weld monitoring unit can also dynamically adjust the characteristics of the emitted laser beam during the laser welding step and/or the laser cleaning step in order to better perform the respective operation.
It will be understood by those skilled in the art that the technical idea of the present invention is not limited to welding stainless steel plates. On the contrary, any material that may be oxidized during the welding process may apply the technical idea of the present invention.
Although specific embodiments of the invention have been described herein in detail, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications may be devised without departing from the spirit and scope of the present invention.
Claims (10)
1. A method for laser welding an oxidisable workpiece, the method comprising at least the steps of:
a laser welding step for laser welding the workpiece to generate a weld; and
a laser cleaning step for performing laser surface cleaning at the weld to remove oxidation products generated during the laser welding operation at the weld.
2. The method of claim 1, wherein,
the workpiece is a stainless steel plate; and/or
The laser welding step and the laser cleaning step are performed using the same laser emitting device (11).
3. The method of claim 2, wherein,
the laser welding step and the laser cleaning step are performed based on a ring-and-core tunable welding technique.
4. The method of any one of claims 1-3,
the laser welding step is carried out in a continuous scanning laser welding mode; and/or
The laser cleaning step is carried out in a laser high-frequency oscillation continuous scanning mode.
5. The method of claim 3 or 4,
the laser cleaning step is only performed on the basis of an inner core in a ring-core adjustable welding technology; and/or
In the laser cleaning step, the laser beam oscillates in the width direction of the weld with an oscillation amplitude larger than the width of the weld.
6. The method of any one of claims 1-5,
the laser welding step and the laser cleaning step are performed by means of a scanning galvanometer; and/or
The laser welding step is performed without a protective gas or with an insufficient protective gas.
7. A laser welding system (1) comprising:
a laser emitting device (11) for generating a welding laser beam; and
a control device (12) for controlling at least the laser emitting device (11) to laser weld the easily oxidized workpiece;
wherein the laser welding system (1) is configured to be adapted to perform the method according to any one of claims 1-6.
8. The laser welding system (1) according to claim 7, wherein the laser welding system (1) further comprises a weld monitoring unit for monitoring the weld, the weld monitoring unit being communicatively connected with the control device (12) for determining the operating parameters of the laser cleaning step based on the weld characteristics monitored by the weld monitoring unit.
9. A control device (12) for a laser welding system (1), wherein the control device (12) is configured to be adapted to perform the method according to any of claims 1-6.
10. A computer program product, wherein the computer program product comprises computer program instructions which, when executed by a processor, implement the method according to any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110498488.5A CN115383307A (en) | 2021-05-08 | 2021-05-08 | Laser welding system, control device, program product and corresponding welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110498488.5A CN115383307A (en) | 2021-05-08 | 2021-05-08 | Laser welding system, control device, program product and corresponding welding method |
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| Publication Number | Publication Date |
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| CN115383307A true CN115383307A (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110498488.5A Pending CN115383307A (en) | 2021-05-08 | 2021-05-08 | Laser welding system, control device, program product and corresponding welding method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115770953A (en) * | 2022-11-29 | 2023-03-10 | 安徽中科春谷激光产业技术研究院有限公司 | Laser sealing welding-laser cleaning composite processing method for microwave device |
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2021
- 2021-05-08 CN CN202110498488.5A patent/CN115383307A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115770953A (en) * | 2022-11-29 | 2023-03-10 | 安徽中科春谷激光产业技术研究院有限公司 | Laser sealing welding-laser cleaning composite processing method for microwave device |
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