WO2022171333A1 - Joint soudé capable de transporter un courant - Google Patents

Joint soudé capable de transporter un courant Download PDF

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Publication number
WO2022171333A1
WO2022171333A1 PCT/EP2021/085627 EP2021085627W WO2022171333A1 WO 2022171333 A1 WO2022171333 A1 WO 2022171333A1 EP 2021085627 W EP2021085627 W EP 2021085627W WO 2022171333 A1 WO2022171333 A1 WO 2022171333A1
Authority
WO
WIPO (PCT)
Prior art keywords
gap
workpieces
depth
laser beam
weld
Prior art date
Application number
PCT/EP2021/085627
Other languages
German (de)
English (en)
Inventor
Friedrich Lupp
Christian Werner
Sven Schlosshauer
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2022171333A1 publication Critical patent/WO2022171333A1/fr

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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
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/1224—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in vacuum
    • 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
    • B23K26/206—Laser sealing

Definitions

  • the invention relates to a current-carrying welded connection and a method for producing it.
  • the object is achieved by a method according to claim 1.
  • the method is used to produce a current-carrying welded connection between two metallic workpieces by means of laser beam welding.
  • “Current-carrying capacity” is understood to mean a welded joint that can conduct a current of 50 A and more permanently without the welded joint being heated above the permissible operating temperature due to the current flow.
  • the method has a step in which the joint surfaces of the Workpieces are placed one on top of the other in such a way that they form a joint gap that has a gap depth. whose weld seam depth is smaller than the gap depth
  • the laser beam is guided in such a way that at least two of the weld seams are at different levels in relation to the joint gap.
  • connection is a current-carrying laser beam welded connection between two metallic workpieces.
  • the welded connection is formed by two or more weld seams, which run in a joint gap having a gap depth, which is formed by surfaces of the workpieces lying against one another.
  • the two or more weld seams each have a weld seam depth that is smaller than the gap depth, and at least two of the weld seams are at different levels in relation to the joint gap.
  • the invention is based on a segmentation of a weld seam into two or more individual weld seams which, seen in the direction of the depth of the joint gap, lie one behind the other.
  • the joint gap is closed with a plurality of weld seams, each with smaller weld depths, preferably in successive weld runs. In this way, a joint gap of any depth can be closed independently of the welding depth that can be achieved with a laser beam.
  • the segmentation leads to a drastic reduction in the heat introduced during the connection process and thus to the fulfillment of any temperature restrictions.
  • Thomas Graf Lasers in material processing - research reports from the IFSW, University of Stuttgart, Institute for Beam Tools (IFSW), Kunststoff: Herbert Utz Verlag 2018, ISBN 978-3-8316-4738-5.
  • the standard disk lasers recommended for copper welding due to their low susceptibility to back reflections are currently only available up to 16 kW (e.g. lasers from Trumpf GmbH & Co. KG, Ditzingen, DE), apart from the beam quality that decreases with increasing laser beam power (expanded , poorly focused beam), resulting in an even higher power requirement. This limits the technical availability of the system technology and leads to relatively high investment costs.
  • the lower laser power required not only reduces the investment in the laser device, but also in its peripherals, such as e.g. B. cooler, optics, protective housing: overall, less complex system technology is required.
  • At least two of the weld seams lie in non-overlapping deep sections of the joint gap.
  • an inlay ie a metallic insert
  • a metallic insert is inserted into the joint gap. placed, which separates two or more welds from each other.
  • the inlays preferably correspond to the shapes of the joint gaps, i. H. an inlay can be designed as a ring in the case of a circular joint gap and as a rectangular strip in the case of a linear joint gap.
  • the inlays as well as the recesses of the workpieces can have a rectangular cross-section in order to facilitate their manufacture.
  • the weld seams are produced in a rough vacuum.
  • the vacuum serves to calm the weld.
  • high-quality weld seams can be produced, characterized by an almost homogeneous connection cross-section, no pores, no cracks and a resistance of ⁇ 100 pOhm.
  • the vacuum is advantageously in a range of less than 200 mbar.
  • the positive effect of the vacuum is more pronounced the lower the pressure.
  • a particularly advantageous compromise There is a difference between the effort required to generate the vacuum and the welding result at a vacuum of approx. 20 mbar.
  • the two metallic workpieces are made of copper or copper alloys. Both workpieces can be made of copper or of the same or different copper alloys. It is also possible that one of the workpieces is made of copper and the other workpiece is made of a copper alloy.
  • the two metallic workpieces are made of aluminum or aluminum alloys. Both workpieces can be made of aluminum or of the same or different aluminum alloys. It is also possible that one of the workpieces consists of aluminum and the other workpiece consists of an aluminum alloy.
  • heat management is practiced so that temperature restrictions are observed:
  • the workpieces are preferably allowed to cool down sufficiently before a second weld seam is produced.
  • the weld joint to be produced is preferably divided into as many smaller weld seams as are necessary to ensure that the workpieces do not overheat.
  • the workpieces are cooled, e.g. B. with liquid nitrogen.
  • FIG. 1 shows a section of an arrangement of two metal workpieces
  • Figure 2 is a plan view of the arrangement of Figure 1;
  • Figure 3 is a sectional view of a conventional welded joint of the two metal workpieces of Figure 1;
  • Figure 4 is a plan view of the weld of Figure 3;
  • FIG. 5 shows a section of a welded connection according to a first embodiment of the invention.
  • Sections and top views illustrating steps for producing a welded joint according to a second embodiment of the invention.
  • Figure 1 shows a section of an arrangement of two metallic workpieces 10, 20.
  • a first workpiece 10 designed as a rod is inserted into a circular through-hole of a second workpiece 20 designed as a plate with a thickness D, so that an end face 100 of the rod 10 lies in one plane with an end face 200 of the plate 20 .
  • a joint gap 3 is formed between the workpieces 10, 20, which gap has a depth T3 and a gap width B3.
  • the gap depth T3 of the joining gap corresponds to the thickness D of the plate 20.
  • FIG. 2 shows a plan view of the end faces 100, 200 of the workpiece arrangement 10, 20 shown in FIG the joint gap 3 formed between the rod 10 and the plate 20 with the gap width B3 can be seen.
  • FIG. 3 and FIG. 4 show a section and a plan view of a conventional welded connection, with which the two metallic workpieces 10, 20 shown in FIGS. 1 and 2 are connected in a materially bonded manner.
  • the weld seam 1 produced by a laser beam extends over the entire gap depth T3 of the joint gap 3.
  • FIG. 5 shows a section of a welded connection according to a first embodiment of the invention.
  • Two workpieces 10', 20' designed as metal plates of the same thickness each have a plate edge which serves as joining surfaces 11, 21. Since the workpieces 10 ', 20' lie against one another in such a way that their joining surfaces 11, 21 laterally limit a joining gap 3 with a rectangular cross section.
  • the respective center point of the weld seams 1, 2, measured in the direction along the depth of the joint gap 3, is defined as the position of the weld seams 1, 2.
  • the two welds 1, 2 are in non-overlapping Tiefenab sections DT31, DT32 of the joint gap 3, so are seen in Rich direction along the depth of the joint gap 3, one behind the other.
  • FIG. 6 shows a section of an arrangement of two metallic workpieces 10'', 20''.
  • a rod first workpiece 10" formed in a circular through-bore of a plate designed as a second workpiece 20" is inserted, so that an end face 100 of the rod 10'' lies in one plane with an end face 200 of the plate 20''.
  • the lower half of the plate 20'' is brought up to the rod 10'', forming a joint gap, while the upper half of the plate 20'' is at a distance from the rod 10''.
  • the plate 20'' ends in its upper half at a radius 23 which is larger than the radius 13 of the rod 10''; thus the rod 10'' is surrounded by an annular recess 5 ⁇ m in the upper half of the plate 20''.
  • FIG. 7 illustrates the geometry of the workpieces and weld seam shown in FIG. 6 using a plan view of the end faces 100, 200 of the workpieces 10'', 20''.
  • Figure 8 illustrates, starting from the in Figs. 6 and 7, a further step for producing a welded joint according to the invention between the workpieces 10'', 20''.
  • An inlay 6 designed as a ring is inserted into the annular recess 5 surrounding the rod 10''. This creates a first joint gap 7 between the inlay 6 and the rod 10'' and a second joint gap 8 between the inlay 6 and the plate 20''.
  • FIG. 9 illustrates the geometry of the workpieces and weld seam shown in FIG. 8 using a plan view on the end faces 100, 200 of the workpieces 10'', 20''.
  • Figure 10 illustrates, starting from the in Figs. 8 and 9 arrangement shown, a further step for producing a welded joint according to the invention between the workpieces corners 10'', 20''.
  • a weld seam 31 is produced between the inlay 6 and the rod 10'' by means of laser beam welding.
  • a weld seam 32 is produced between the inlay 6 and the plate 20'' by means of laser beam welding.
  • the inlay 6 is arranged in such a way that an annular cavity 33 is formed on the bottom of the inlay 6 facing away from the end faces 100, 200.
  • the cavity 33 which is formed due to the process in that the inlay 6 is not welded to the workpieces 10'', 20'' at its bottom facing away from the end faces 100, 200, should be as small as possible.
  • 16 kW is required with a conventional design as a single continuous weld seam, is separated into two weld seam segments, each 4 mm deep, then there is only one NIR laser with a laser beam power of 8 kW and, if necessary, an additional laser with 1 kW in the green wavelength range is necessary in order to produce high-quality weld seams with a welding depth of 4 mm.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

Le procédé selon l'invention permettant de produire un joint soudé entre deux pièces à usiner métalliques (10, 20) au moyen d'un soudage par faisceau laser, le joint soudé étant capable de transporter un courant, comprend les étapes suivantes consistant à : placer ensemble des surfaces de jonction (11, 21) des pièces à usiner (10, 20) de manière à former un interstice de jonction (3) ayant une profondeur d'interstice (T3), et guider un faisceau laser (4) le long de l'interstice de jonction (3) au moins deux fois. Au cours de chaque guidage, les pièces à usiner (10, 20) sont jointes au moyen d'un cordon de soudure associé (1, 2) dont la profondeur de cordon de soudure (T1, T2) est inférieure à la profondeur d'interstice (T3). Le faisceau laser (4) est guidé de telle sorte qu'au moins deux des cordons de soudure (1, 2) se trouvent à des niveaux différents (T31, T32) par rapport à l'interstice de jonction (3).
PCT/EP2021/085627 2021-02-12 2021-12-14 Joint soudé capable de transporter un courant WO2022171333A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021201360.0 2021-02-12
DE102021201360.0A DE102021201360A1 (de) 2021-02-12 2021-02-12 Stromtragfähige Schweißverbindung

Publications (1)

Publication Number Publication Date
WO2022171333A1 true WO2022171333A1 (fr) 2022-08-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/085627 WO2022171333A1 (fr) 2021-02-12 2021-12-14 Joint soudé capable de transporter un courant

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DE (1) DE102021201360A1 (fr)
WO (1) WO2022171333A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1491279A1 (fr) * 2003-06-27 2004-12-29 Schuler Held Lasertechnik GmbH & Co. KG Procédé de soudage multifocal et appareil de soudage
JP2007222891A (ja) * 2006-02-22 2007-09-06 Horikawa Inc 眼鏡用金属部材の接合方法
US20140299581A1 (en) * 2013-04-04 2014-10-09 Alstom Technology Ltd. Method for welding rotors for power generation
WO2018227115A1 (fr) * 2017-06-09 2018-12-13 Ipg Photonics Corporation Soudage en trou de serrure à base de laser

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0732174A (ja) 1993-07-22 1995-02-03 Nippon Steel Corp レーザー溶接方法
CN105149786B (zh) 2015-10-19 2016-09-28 哈尔滨工业大学 一种基于预制焊材的窄间隙激光扫描多层自熔焊接方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1491279A1 (fr) * 2003-06-27 2004-12-29 Schuler Held Lasertechnik GmbH & Co. KG Procédé de soudage multifocal et appareil de soudage
JP2007222891A (ja) * 2006-02-22 2007-09-06 Horikawa Inc 眼鏡用金属部材の接合方法
US20140299581A1 (en) * 2013-04-04 2014-10-09 Alstom Technology Ltd. Method for welding rotors for power generation
WO2018227115A1 (fr) * 2017-06-09 2018-12-13 Ipg Photonics Corporation Soudage en trou de serrure à base de laser

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANDREAS HEIDER: "Dissertation Universität Stuttgart", 2018, UNIVERSITÄT STUTTGART, INSTITUT FÜR STRAHLWERKZEUGE (IFSW, article "Laser in der Materialbearbeitung - Forschungsberichte des IFSW"

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DE102021201360A1 (de) 2022-08-18

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