CA2209804A1 - Method of laser beam welding of zinc-coated steel sheet - Google Patents
Method of laser beam welding of zinc-coated steel sheetInfo
- Publication number
- CA2209804A1 CA2209804A1 CA 2209804 CA2209804A CA2209804A1 CA 2209804 A1 CA2209804 A1 CA 2209804A1 CA 2209804 CA2209804 CA 2209804 CA 2209804 A CA2209804 A CA 2209804A CA 2209804 A1 CA2209804 A1 CA 2209804A1
- Authority
- CA
- Canada
- Prior art keywords
- welding
- zinc
- laser beam
- protuberances
- components
- 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.)
- Abandoned
Links
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
- B23K33/004—Filling of continuous seams
- B23K33/008—Filling of continuous seams for automotive applications
-
- 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
- B23K26/244—Overlap 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
- B23K26/20—Bonding
- B23K26/32—Bonding taking account of the properties of the material involved
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
Abstract
A pair of coated components are laser welded to one another by initially forming protuberances on one of the components. The protuberances maintain juxtaposed surfaces separated and the components are then laser welded to one another. The separation of the surfaces vents vapor generated by the coating.
Description
CA 02209804 1997-08-lF7 METHOD OF LASER BEAM WELDING
OF ZINC-COATED STEEL ~11~;1 The present invention relates to a method of making lap joint of zinc-coated steel sheets with a s laser beam.
BACKGROUND OF THE INVENTION
The increased use of zinc-rich coated steel sheets in auto-body components for enhanced corrosion resistance poses a demand for an acceptable welding method to join these kinds of sheets.
10 Laser beam welding has an advantage of low total heat input and thus causes a low distortion to the zinc-rich coating on the sheet. Therefore laser beam welding is being evaluated as a desirable joining technique for such sheet steel in butt and lap joint configurations. However, a problem arises with welding these m~teri~l~ in the lapjoint configuration due to the low boiling point of zinc (906 ~C) compared with the melting temperature of steel (~1550 ~C).
If there is no joint clearance between the sheets the zinc vapor during welding can only escape through the molten welding pool, and this typically results in excessive weld porosity or complete expulsion of the weld metal. In order to make a good quality weld, there are, in principle, two solutions to get around this problem: (l)creating a zinc-vapor venting channel during welding; or (2)removing the zinc coating in the welding pass. Both of these approaches need additional techniques to be realized.
20 Many techniques have been developed to provide a gap between sheets to perform laser welding and to remove the zinc coat at the welding spot. These approaches typically require the use of supplementary components or spacers and cannot be employed in the production line, since additional equipment is CA 02209804 1997-08-1~
required to create a gap or remove the coating. This will incur a signifi~nt expense and increase production time.
It is therefore an object of the present invention to obviate or mitig~te the above disadvantages.
The present invention is intended to provide a practical and flexible way of making laser beam lap weld of zinc-coated steel sheets. In general terms, a laser beam interaction with one surface of the m~tt-ri~l is used to create an acceptable gap between the sheets before the welding pass is performed.
More specifically, protuberances are formed on one surface of one sheet by impingement of a 10 laser beam which m~int~in~ opposed surfaces of the sheets in spaced relationship. In this manner, the welding may be completed entirely on a single welding apparatus in an efficient cost-effective manner.
With such a technique, it is possible to make a curved welding pass and it is applicable to 3D welding configuration. Therefore, this technique makes the production of laser beam lap welds of the zinc-coated steel sheets possible using an exiting butt welding system.
The preferred embodiment of the invention relates to a method of creating a gap for vapor gas venting by the laser beam before welding is performed. The principle is that a laser beam pulse with an appropriate pulse length can melt a spot on the metal sheet when it interacts with steel and soli(lifi~;~tion of the molten metal forms a protuberance. The protuberance height above the sheet surface could be a few tenths millimeters. A series of protuberances in a line or curve serves as natural spacer. When the 20 laser pulse pre-processed sheet is put together with another sheet, a gap is formed. Laser welding can thus be performed along the spotted line/curve and go over the protuberances. The appropriate distance between two laser created protuberances depends upon the clamping force, laser beam power, sc~nning CA 02209804 1997-08-1~
speed and the thi~knPss of the steel sheets. In lap welding, the sheet on which laser pulses generate protuberances can be either the top one or the bottom one. For both configurations, good quality welds can be produced.
s DESCRIPTION OF THE INVENTION
Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings, in which Figure 1 is a plan view of a pair of lap welded components;
Figure 2 is a view on the line 2-2 of the sequential steps in performing a weld on the components;
Figure 3 is an alternative embodiment showing the production of a spot weld;
Figure 4 is a photographic representation of a portion of one of the sheets shown in Figure 2;
Figure 5a is a photographic representation of a section on the weld shown in Figure l;
Figure 5b is a photographic representation of a plan view of the weld shown in Figure l; and Figure 6 is photographic representations of welded components produced by the technique shown in Figure 2.
Referring therefore to Figure 1, a pair of components 10, 12 are connected by seam welding along a seam line 13 intli~tecl in chain dot line. Each of the components is a steel sheet having oppositely directed surfaces 16, 17 and lX, 20 respectively. Each of the surfaces has a zinc coating 22 to provide protection from corrosion.
As shown in Figure 2, one of the components to be welded, namely zinc-coated steel sheet 10 is placed on a welding table (any kind of table used for laser welding). A series of laser beam pulses 14 tr~n.~mitted through laser head 23 are used to impinge on one of the surfaces 16 of the sheet 10 to create CA 02209804 1997-08-1~
a series of protuberances 15 along the intended weld line 13. This process can be done by moving laser beam 14 over the sheet 10 or by manipulating the focusing optics of the laser head.
Once the pulsed protuberances are formed, the zinc-coated steel sheet 12is placed on top of the laser-pulsed sheet 10 so that surface 18 overlies the surface 16. Alternatively, of course, the laser-pulsed steel sheet 10 may be placed on top of the other zinc-coated steel sheet 12. Under either condition, the steel sheets 10, 12 are pressed together by a clamp (not shown). As a result, two sheets to be welded are held together and are ready to be welded.
The protuberances 15 forms an air gap 24 between the opposed surfaces 16, 18 of overlapping portions of the zinc-coated steel sheets 10, 12 along the weld line 13.
The welding operation is carried out by applying laser beam 14 to the steel sheets 10, 12 as in-lic~ted in Figure 2 by arrow A. During the welding, the zinc vapor 26 of the zinc coating 22 can flow into the air gap 24 surrounding the welding keyhole. Therefore, no air holes or very few air holes are formed in the solidified metal weld 19. Thus, the resultant weld is satisfactory in quality.
In a typical welding operation using a 1.5 kW CO2 laser, the protuberances 15 were formed by 15 beam pulses of 100 - 150 millisec in duration. The thickness of the sheet 10 was ~1.0 mm and the m~teri~l galvanneal steel. The height of the protuberances 15 was in the order of 0.4 mm with a diameter of in the order of 2 mm. As can be seen from Figure 4, the protuberance is irregular but of ~u~rlcienl height to m~int~in the surfaces 16, 18 separated. The spacing of the protuberances was about 50 mm for the material selected although this spacing may vary according to the material.
The components 10, 12 were seam welded using the 1.5 kW laser in continuous mode traveling at a welding speed of 1.5 in/sec. The resultant weld is shown in Figure 5 where it can be seen that good homogeneity has been obtained.
CA 02209804 1997-08-1~
The above embodiment has been described with respect to seam welding but a similar technique may be used for spot welding.
As shown in Figure 3, one of the components 10 to be welded is placed on a working table or frame. At the locations where laser spot welds are to be made, a laser beam pulse 14 impinges on surface s 16 to create a protuberance 15. After all the locations are pulsed by laser beam 14, zinc-coated steel sheet 12 is placed on top and clamped. As a result of this configuration, an air gap is formed between two zinc-coated steel sheets around the laser-generated humps. The welding operation is carried out by applying a laser beam 14 to the steel sheets adjacent to each protuberance 15. The laser beam draws a circle of small radius around the protuberance to provide a localized circular weld. Welding will not affected if the path lo of the beam intercepts the protuberance.
As described in the seam welding embodiment above, the zinc vapor 26 escapes into the air gap around the hump. Therefore, a circular weld 19 is made and the resultant weld is satisfactory in quality.
This circular weld can be considered as a spot weld.
According to the above description, the creation of natural spacer by this technique is simple and 1S flexible as the laser beam can be put on anywhere on the sheet to create protuberances and to perform welding. Moreover, implementation of lap welding can be done with present laser welding systems with little additional costs.
OF ZINC-COATED STEEL ~11~;1 The present invention relates to a method of making lap joint of zinc-coated steel sheets with a s laser beam.
BACKGROUND OF THE INVENTION
The increased use of zinc-rich coated steel sheets in auto-body components for enhanced corrosion resistance poses a demand for an acceptable welding method to join these kinds of sheets.
10 Laser beam welding has an advantage of low total heat input and thus causes a low distortion to the zinc-rich coating on the sheet. Therefore laser beam welding is being evaluated as a desirable joining technique for such sheet steel in butt and lap joint configurations. However, a problem arises with welding these m~teri~l~ in the lapjoint configuration due to the low boiling point of zinc (906 ~C) compared with the melting temperature of steel (~1550 ~C).
If there is no joint clearance between the sheets the zinc vapor during welding can only escape through the molten welding pool, and this typically results in excessive weld porosity or complete expulsion of the weld metal. In order to make a good quality weld, there are, in principle, two solutions to get around this problem: (l)creating a zinc-vapor venting channel during welding; or (2)removing the zinc coating in the welding pass. Both of these approaches need additional techniques to be realized.
20 Many techniques have been developed to provide a gap between sheets to perform laser welding and to remove the zinc coat at the welding spot. These approaches typically require the use of supplementary components or spacers and cannot be employed in the production line, since additional equipment is CA 02209804 1997-08-1~
required to create a gap or remove the coating. This will incur a signifi~nt expense and increase production time.
It is therefore an object of the present invention to obviate or mitig~te the above disadvantages.
The present invention is intended to provide a practical and flexible way of making laser beam lap weld of zinc-coated steel sheets. In general terms, a laser beam interaction with one surface of the m~tt-ri~l is used to create an acceptable gap between the sheets before the welding pass is performed.
More specifically, protuberances are formed on one surface of one sheet by impingement of a 10 laser beam which m~int~in~ opposed surfaces of the sheets in spaced relationship. In this manner, the welding may be completed entirely on a single welding apparatus in an efficient cost-effective manner.
With such a technique, it is possible to make a curved welding pass and it is applicable to 3D welding configuration. Therefore, this technique makes the production of laser beam lap welds of the zinc-coated steel sheets possible using an exiting butt welding system.
The preferred embodiment of the invention relates to a method of creating a gap for vapor gas venting by the laser beam before welding is performed. The principle is that a laser beam pulse with an appropriate pulse length can melt a spot on the metal sheet when it interacts with steel and soli(lifi~;~tion of the molten metal forms a protuberance. The protuberance height above the sheet surface could be a few tenths millimeters. A series of protuberances in a line or curve serves as natural spacer. When the 20 laser pulse pre-processed sheet is put together with another sheet, a gap is formed. Laser welding can thus be performed along the spotted line/curve and go over the protuberances. The appropriate distance between two laser created protuberances depends upon the clamping force, laser beam power, sc~nning CA 02209804 1997-08-1~
speed and the thi~knPss of the steel sheets. In lap welding, the sheet on which laser pulses generate protuberances can be either the top one or the bottom one. For both configurations, good quality welds can be produced.
s DESCRIPTION OF THE INVENTION
Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings, in which Figure 1 is a plan view of a pair of lap welded components;
Figure 2 is a view on the line 2-2 of the sequential steps in performing a weld on the components;
Figure 3 is an alternative embodiment showing the production of a spot weld;
Figure 4 is a photographic representation of a portion of one of the sheets shown in Figure 2;
Figure 5a is a photographic representation of a section on the weld shown in Figure l;
Figure 5b is a photographic representation of a plan view of the weld shown in Figure l; and Figure 6 is photographic representations of welded components produced by the technique shown in Figure 2.
Referring therefore to Figure 1, a pair of components 10, 12 are connected by seam welding along a seam line 13 intli~tecl in chain dot line. Each of the components is a steel sheet having oppositely directed surfaces 16, 17 and lX, 20 respectively. Each of the surfaces has a zinc coating 22 to provide protection from corrosion.
As shown in Figure 2, one of the components to be welded, namely zinc-coated steel sheet 10 is placed on a welding table (any kind of table used for laser welding). A series of laser beam pulses 14 tr~n.~mitted through laser head 23 are used to impinge on one of the surfaces 16 of the sheet 10 to create CA 02209804 1997-08-1~
a series of protuberances 15 along the intended weld line 13. This process can be done by moving laser beam 14 over the sheet 10 or by manipulating the focusing optics of the laser head.
Once the pulsed protuberances are formed, the zinc-coated steel sheet 12is placed on top of the laser-pulsed sheet 10 so that surface 18 overlies the surface 16. Alternatively, of course, the laser-pulsed steel sheet 10 may be placed on top of the other zinc-coated steel sheet 12. Under either condition, the steel sheets 10, 12 are pressed together by a clamp (not shown). As a result, two sheets to be welded are held together and are ready to be welded.
The protuberances 15 forms an air gap 24 between the opposed surfaces 16, 18 of overlapping portions of the zinc-coated steel sheets 10, 12 along the weld line 13.
The welding operation is carried out by applying laser beam 14 to the steel sheets 10, 12 as in-lic~ted in Figure 2 by arrow A. During the welding, the zinc vapor 26 of the zinc coating 22 can flow into the air gap 24 surrounding the welding keyhole. Therefore, no air holes or very few air holes are formed in the solidified metal weld 19. Thus, the resultant weld is satisfactory in quality.
In a typical welding operation using a 1.5 kW CO2 laser, the protuberances 15 were formed by 15 beam pulses of 100 - 150 millisec in duration. The thickness of the sheet 10 was ~1.0 mm and the m~teri~l galvanneal steel. The height of the protuberances 15 was in the order of 0.4 mm with a diameter of in the order of 2 mm. As can be seen from Figure 4, the protuberance is irregular but of ~u~rlcienl height to m~int~in the surfaces 16, 18 separated. The spacing of the protuberances was about 50 mm for the material selected although this spacing may vary according to the material.
The components 10, 12 were seam welded using the 1.5 kW laser in continuous mode traveling at a welding speed of 1.5 in/sec. The resultant weld is shown in Figure 5 where it can be seen that good homogeneity has been obtained.
CA 02209804 1997-08-1~
The above embodiment has been described with respect to seam welding but a similar technique may be used for spot welding.
As shown in Figure 3, one of the components 10 to be welded is placed on a working table or frame. At the locations where laser spot welds are to be made, a laser beam pulse 14 impinges on surface s 16 to create a protuberance 15. After all the locations are pulsed by laser beam 14, zinc-coated steel sheet 12 is placed on top and clamped. As a result of this configuration, an air gap is formed between two zinc-coated steel sheets around the laser-generated humps. The welding operation is carried out by applying a laser beam 14 to the steel sheets adjacent to each protuberance 15. The laser beam draws a circle of small radius around the protuberance to provide a localized circular weld. Welding will not affected if the path lo of the beam intercepts the protuberance.
As described in the seam welding embodiment above, the zinc vapor 26 escapes into the air gap around the hump. Therefore, a circular weld 19 is made and the resultant weld is satisfactory in quality.
This circular weld can be considered as a spot weld.
According to the above description, the creation of natural spacer by this technique is simple and 1S flexible as the laser beam can be put on anywhere on the sheet to create protuberances and to perform welding. Moreover, implementation of lap welding can be done with present laser welding systems with little additional costs.
Claims (3)
1. A method of laser welding a pair of juxtaposed components comprising the steps of forming on one surface of one component a protuberance to project above said surface, juxtaposing said components such that opposed surfaces are maintained separated by said protuberances, and laser welding said components by impingement of a laser beam in the region in which said surfaces are separated.
2. A method according to claim 1 wherein said protuberances are formed by impingement by laser beam.
3. A method according to claim 1 wherein said weld is formed by rotating said beam about one of said protuberances.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2209804 CA2209804A1 (en) | 1997-08-15 | 1997-08-15 | Method of laser beam welding of zinc-coated steel sheet |
| BR9811906-0A BR9811906A (en) | 1997-08-15 | 1998-08-14 | Laser welding process of a pair of components |
| EP98940005A EP1003624A1 (en) | 1997-08-15 | 1998-08-14 | Method of laser beam welding of zinc-coated steel sheet |
| PCT/CA1998/000779 WO1999008829A1 (en) | 1997-08-15 | 1998-08-14 | Method of laser beam welding of zinc-coated steel sheet |
| AU88474/98A AU8847498A (en) | 1997-08-15 | 1998-08-14 | Method of laser beam welding of zinc-coated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2209804 CA2209804A1 (en) | 1997-08-15 | 1997-08-15 | Method of laser beam welding of zinc-coated steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2209804A1 true CA2209804A1 (en) | 1999-02-15 |
Family
ID=4161019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2209804 Abandoned CA2209804A1 (en) | 1997-08-15 | 1997-08-15 | Method of laser beam welding of zinc-coated steel sheet |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1003624A1 (en) |
| AU (1) | AU8847498A (en) |
| BR (1) | BR9811906A (en) |
| CA (1) | CA2209804A1 (en) |
| WO (1) | WO1999008829A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10512986B2 (en) | 2016-02-15 | 2019-12-24 | Ford Global Technologies, Llc | Laser welding process |
| CN112355474A (en) * | 2015-02-09 | 2021-02-12 | 司浦爱激光技术英国有限公司 | Laser welding method using micro-welding piece pattern |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10116919C1 (en) * | 2001-04-05 | 2003-02-13 | Nothelfer Gmbh | Method and device for joining coated sheets by laser welding |
| DE10262053A1 (en) | 2002-09-05 | 2004-08-12 | Daimlerchrysler Ag | Process for the laser processing of coated metal sheets |
| DE10331745B4 (en) * | 2003-07-11 | 2012-06-28 | Volkswagen Ag | Laser welding connection and method for producing a laser welding connection |
| DE102004005358B4 (en) * | 2004-02-03 | 2007-03-22 | Daimlerchrysler Ag | Process for the laser processing of coated sheets and coated sheet metal |
| DE102004025931B3 (en) * | 2004-05-27 | 2005-11-03 | Daimlerchrysler Ag | Assembly of interconnected conductive components, which carry KTL corrosion protection and process for their preparation |
| EP1674191A3 (en) * | 2004-12-22 | 2007-05-30 | Schlegel Ag | Two sheet-metal component manufacturing method and two sheet-metal component therefor. |
| FR2915912B1 (en) * | 2007-05-11 | 2010-02-26 | Peugeot Citroen Automobiles Sa | METHOD FOR LASER WELDING OF METALLIC ELEMENTS |
| WO2012000106A1 (en) * | 2010-07-01 | 2012-01-05 | Magna International Inc. | Laser-based lap welding of sheet metal components using laser induced protuberances to control gap |
| BR112015019101B1 (en) * | 2013-02-15 | 2020-04-22 | Nissan Motor | laser welding method and laser welding device |
| EP3112077B1 (en) | 2014-02-25 | 2021-03-31 | Panasonic Intellectual Property Management Co., Ltd. | Laser welding method |
| CN108349045B (en) * | 2015-11-17 | 2019-11-05 | 日产自动车株式会社 | Method for laser welding and laser soldering device |
| CN106041308A (en) * | 2016-08-18 | 2016-10-26 | 安徽巨自动化装备有限公司 | Method for controlling gaps of laser fusion weld plates of aluminum alloy vehicle bodies |
| EP3584031A1 (en) | 2018-06-20 | 2019-12-25 | Sund Birsta AB | Strapping machine for and method of securing a piece of coated metal strap in a loop around one or more objects |
| WO2020112728A1 (en) * | 2018-11-27 | 2020-06-04 | Shape Corp. | Galvanized multi-tubular beam and method of continuously forming the same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60255294A (en) * | 1984-05-31 | 1985-12-16 | Kubota Ltd | Laser beam welding method |
| DE3812448C1 (en) * | 1988-04-14 | 1989-06-15 | Bayerische Motoren Werke Ag, 8000 Muenchen, De | |
| DE3933408A1 (en) * | 1989-10-06 | 1990-08-30 | Daimler Benz Ag | OVERLAP OR ROD WELDING SEAL FOR GALVANIZED SHEETS |
| US5389761A (en) * | 1993-09-17 | 1995-02-14 | General Motors Corporation | Method and apparatus for cleaning metal pieces prior to resistive seam welding or laser lap seam welding |
| US5454480A (en) * | 1993-10-21 | 1995-10-03 | Morris Holmes & Co. | Flangeless fuel tank |
| FR2731373B1 (en) * | 1995-03-09 | 1997-04-18 | Peugeot | METHOD FOR WELDING SHEETS BY A LASER BEAM AND ASSEMBLY OF WELDED SHEETS OBTAINED BY THIS PROCESS |
-
1997
- 1997-08-15 CA CA 2209804 patent/CA2209804A1/en not_active Abandoned
-
1998
- 1998-08-14 EP EP98940005A patent/EP1003624A1/en not_active Withdrawn
- 1998-08-14 BR BR9811906-0A patent/BR9811906A/en not_active IP Right Cessation
- 1998-08-14 WO PCT/CA1998/000779 patent/WO1999008829A1/en not_active Application Discontinuation
- 1998-08-14 AU AU88474/98A patent/AU8847498A/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112355474A (en) * | 2015-02-09 | 2021-02-12 | 司浦爱激光技术英国有限公司 | Laser welding method using micro-welding piece pattern |
| CN112355474B (en) * | 2015-02-09 | 2023-04-25 | 通快激光英国有限公司 | Laser welding method using micro weldment pattern |
| US10512986B2 (en) | 2016-02-15 | 2019-12-24 | Ford Global Technologies, Llc | Laser welding process |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999008829A9 (en) | 2000-04-13 |
| EP1003624A1 (en) | 2000-05-31 |
| BR9811906A (en) | 2000-08-15 |
| WO1999008829A1 (en) | 1999-02-25 |
| AU8847498A (en) | 1999-03-08 |
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Effective date: 20030603 |