US20120325379A1 - Method for producing a corrosion-resistant, workable sheet metal with full-surface coating of the joined, thermally treated steel sheets - Google Patents

Method for producing a corrosion-resistant, workable sheet metal with full-surface coating of the joined, thermally treated steel sheets Download PDF

Info

Publication number
US20120325379A1
US20120325379A1 US12/376,211 US37621107A US2012325379A1 US 20120325379 A1 US20120325379 A1 US 20120325379A1 US 37621107 A US37621107 A US 37621107A US 2012325379 A1 US2012325379 A1 US 2012325379A1
Authority
US
United States
Prior art keywords
weld
welding
steel sheets
annealing
electrolyte
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
Application number
US12/376,211
Other languages
English (en)
Inventor
Harald Baulig
Bernd Baumann
Josef Kesselem
Helmut Oberhoffer
Andrea Link
Reiner Sauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Rasselstein GmbH
Original Assignee
Rasselstein GmbH
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 Rasselstein GmbH filed Critical Rasselstein GmbH
Assigned to RASSELSTEIN GMBH reassignment RASSELSTEIN GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OBERHOFFER, HELMUT, SAUER, REINER, BAULIG, HARALD, KESSELEM, JOSEF, BAUMANN, BERND, FRIEDRICH, KARL ERNST, LINK, ANDREA
Assigned to THYSSENKRUPP RASSELSTEIN GMBH reassignment THYSSENKRUPP RASSELSTEIN GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: RASSELSTEIN GMBH
Publication of US20120325379A1 publication Critical patent/US20120325379A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/005—Contacting devices
    • 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
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/0046—Welding
    • B23K15/0053—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
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/1423—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor the flow carrying an electric current
    • 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
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/144—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor the fluid stream containing particles, e.g. powder
    • 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
    • B23K26/242—Fillet welding, i.e. involving a weld of substantially triangular cross section joining two parts
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C25D17/14—Electrodes, e.g. composition, counter electrode for pad-plating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/02—Electroplating of selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/04—Electroplating with moving electrodes
    • C25D5/06—Brush or pad plating
    • 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
    • B23K2101/18—Sheet panels
    • B23K2101/185—Tailored blanks

Definitions

  • the present invention relates to a method of producing corrosion-resistant and workable sheet metals and also relates to a device for applying a metallic coating to butt-joint welds in steel sheets.
  • Sheet metals produced with this method can be used for the production of containers for packing foodstuffs, for example, cans of tinned food or beverage cans or even in other fields in which corrosion-resistant sheet metals with good workability are required, for example for production of automotive body panels.
  • the sheet metals must be corrosion-resistant for use of sheet metals in the production of food packages or automotive body panels.
  • the sheet metal In the case of food packages, the sheet metal must be corrosion-resistant such that the sheet metal surface is not attacked by the aggressive filling. For this reason, steel sheets that are used for the production of food packages are provided with a corrosion-resistant coating. In this case, it can be a metallic coating as is the case with tin plate (tinned steel sheet).
  • the coated sheet metal For producing food packages, the coated sheet metal must then be reshaped, for example, in a deep-drawing process. During the production of coated sheet metals, defective or damaged spots in the sheet metal are cut out and the defect-free sheet metal parts are subsequently welded together to form a sheet metal strip of standard length that is wound on to a reel. Such sheet metal strips that have been welded together from many pieces of sheet metal have unsatisfactory forming behavior because the sheet metal in the region of welds cannot be shaped in a satisfactory manner. For example, corrosion-resistant steel sheets are used for producing tin cans which comprise one welded body and two folded lids. In the region of welds, the sheet metal which is composed of individual steel sheets has a distinctly higher hardness than the individual steel sheets, resulting in inferior workability of sheet metal in the region of welds.
  • EP 540 382 A1 describes a method for producing a deep-drawn steel sheet formed from at least two elements in which the edges of the elements are welded by beam welding wherein the welded edges of the elements are swept with a laser beam before welding to reduce the hardness of the weld, and oxygen is fed simultaneously. Thus, decarburization and oxidation of edges is achieved.
  • the preparatory laser beam affects the geometrical formation of the sheet edge in the case of thin sheet thicknesses in a disadvantageous manner, since the material is stretched above its plastic limit due to thermal energy inputs. This leads to increased internal stresses and leads to component warping at the sheet edge.
  • An accurate implementation of subsequent laser welding without height offsets, and alternating weld widths, and with uniform seam geometry seems improbable to achieve, but it must be available for optimum shaping results.
  • this type of heat treatment in combination with material decarburization leads to the formation of distinct heat-affected zones with very soft microstructures at which the material always fails during the shaping operations.
  • the introduction of oxygen in the welding region also disguises the danger of material embrittlement and of surface oxidation phenomena in the regions close to the weld where the temperature remains below the decomposition temperature of FeO 2 into Fe and O 2 .
  • the task of the invention is to produce as much as possible a corrosion-resistant and easily workable sheet metal which is put together from individual steel sheets that are welded to each other.
  • FIG. 1 Schematic representation of a partial step of the inventive method by means of a longitudinal section through a weld of two steel sheets joined together;
  • FIG. 2 Top view of the steel sheets joined together during a partial step of the inventive method
  • FIG. 3 Representation of temperature-time cooling diagram for a weld during a procedural step of the inventive method
  • FIG. 4 a Cross section through a device for electrodeposition on a weld in a steel sheet with a metallic coating, shown in the process step during the electrodeposition on the weld;
  • FIG. 4 b sectional representation of device of FIG. 4 a during the implementation of cleaning process for cleaning the electrocoated the weld;
  • FIG. 4 c Top view of the upper anode strip of the device of FIG. 4 a;
  • FIG. 5 Schematic representation of a device for automated regeneration of an application device of the device of FIG. 1 for applying electrolyte onto the weld;
  • FIG. 6 schematic representation of the cleaning unit of the device of FIG. 4 ;
  • FIG. 7 sectional representation of the cleaning unit of FIG. 6 ;
  • FIG. 8 sectional representation of a possible embodiment of the anode of the device of FIG. 4 ;
  • FIG. 9 schematic representation of an application device of the device of FIG. 4 , for applying an electrolyte onto the weld;
  • FIG. 10 sectional representation of the device of FIG. 4 during implementation of a drying step for drying the electrocoated and cleaned weld.
  • a corrosion-resistant and easily workable sheet metal is produced from two or more uncoated steel sheets with sheet thicknesses between 0.10 mm and 0.70 mm in which the bare steel sheets are first placed next to each other in a butting relationship, and subsequently each joint groove is welded by butt-joint welding by means of a welding beam forming a weld.
  • the welding beam can be a laser welding beam or an electron welding beam.
  • a thermal treatment of each weld is effected by means of an annealing beam during or directly after welding; this annealing beam is preferably formed from a laser beam.
  • the sheet metal which is formed from the steel sheets welded together is coated with a metallic coating at least on one side or even on both sides, wherein the or each weld is also coated on one side or both sides.
  • a corrosion-resistant and easily workable sheet metal is produced from two or more steel sheets that are coated with a metallic coating, wherein the coated steel sheets are first placed next to each other in an abutting relationship, and subsequently the joint grooves or each joint groove is welded by butt-joint welding by means of a welding beam forming a weld along the respective joint grooves.
  • each weld is treated thermally by means of an annealing beam.
  • each weld is covered with a strip-shaped, metallic coating on one side or both sides.
  • the coating of welds is in this case preferably effected by electrodeposition on the respective weld.
  • the temperature changes of the weld during cooling can be passed through over a designated period of time in a controlled manner. It has been observed that there is an increase in hardness of welds due to martensite and bainite formation, and also due to residual welding stresses during cooling of the weld.
  • the cooling range between 800° C. and 500° C. is especially critical for martensite formation. If this temperature range is controlled during cooling of the weld and passed through more slowly than was specified at the natural cooling rate, martensite and bainite formation can be suppressed and the internal welding stresses can be reduced, and thus an increase in weld hardness can be avoided. Due to lower weld hardness, the sheet metal which has been welded together from steel sheets then has better workability.
  • welds are protected against corrosion by metallic coating of the welds in the subsequent process step, such that an easily workable and simultaneously corrosion-resistant sheet metal can be produced with the inventive method.
  • the laser beam can be preferably a welding beam or even an annealing beam, wherein the welding beam is directed in the form of a highly focused point in the region of the joint groove on the surface of the steel sheets to be joined, while the annealing beam is directed onto the surface of the weld as a line focus or even as a round, rectangular or elliptical focus with the application area being considerably greater compared to the focus of the welding beam.
  • the annealing beam follows the welding beam in the welding direction. Then, a thermal post-treatment of the weld is undertaken in short time intervals after the end of the welding period.
  • the diameter of the annealing beam focus is preferably selected such that at least the entire width of the weld is covered by the annealing beam focus.
  • the diameter of the annealing beam focus can be adjusted to be even bigger in order to encompass, for example, the heat-affected zone in the lateral direction around the weld or even regions outside its heat-affected zone.
  • the application time of the annealing beam can be adjusted either via the speed of welding or via the length of the annealing beam focus at a constant welding speed.
  • the annealing beam is preferably formed from a laser beam because great variation of the thermal energy coupled into the weld is thus possible.
  • Inductive or conductive heat sources can also be used for producing the annealing beam, wherein these require distinctly more energy for achieving the same results due to their lower energy densities. This has proven to be disadvantageous due to the higher internal stresses and warping or creasing generated in the weld region of.
  • a double laser system is preferably used for the thermal treatment of the weld during welding.
  • This system provides the welding beam in the form of a welding laser beam and the annealing beam in the form of an annealing laser beam.
  • the thermal treatment can take place directly at and synchronously with the front of the weld pool advancing in the direction of welding during welding.
  • FIG. 1 is a schematic representation of the longitudinal section of a joint groove 14 between two steel sheets 1 , 1 ′ placed next to each other in an abutting relationship. It is butt-welded by irradiation with a welding beam 13 ; this beam is directed as a highly focused point in the joint groove 14 .
  • the welding beam 13 thus advances in the welding direction S with a pre-set welding speed.
  • a weld pool 16 is formed in the region of the advancing welding beam 13 in the form of liquefied steel.
  • the annealing beam 15 is directed onto the surface of the steel sheets 1 , 1 ′ along the developing weld 2 in the welding direction S directly behind the welding beam 13 , wherein the diameter of annealing beam focus is considerably greater when compared to the diameter of welding beam focus.
  • FIG. 2 the arrangement of the steel sheets 1 , 1 ′ joined next to each other of FIG. 1 is shown in top view.
  • the shape of the annealing beam focus can take the shape of an oval and/or an elliptical shape.
  • the focus of the annealing beam 15 has the shape of a line focus, wherein the long main axis of the line focus runs lengthwise to the formed weld 2 .
  • An annealing region 17 is formed around the annealing beam focus. In this annealing region 17 , the weld 2 formed by welding of the joint grooves 14 experiences thermal post-treatment directly after the end of the welding period, i.e. during the cooling of weld 2 .
  • the incident angle ⁇ , at which the annealing beam 15 strikes the surface of the steel sheet, is preferably adjustable.
  • the application time, the intensity and the incident angle of the annealing beam 15 are preferably adjusted such that the weld 2 remains in a temperature range of 500° C. to 800° C. during cooling for a period of 1-3 sec.
  • the welding beam 13 is preferably incident—as shown in FIG. 1 —perpendicular to the surface of steel, it can also be incident slantwise.
  • the time curve of the temperature of weld 2 at a specified spot in the joint groove 14 is shown during and after welding.
  • the temperature first increases tremendously when the welding beam 13 travels across this spot. The temperature reaches values above the melting temperature T S of the steel sheets such that these are fused. After passing through the welding beam 13 , i.e., after the end of the welding period, the temperature drops again, wherein the shape of temperature-time curve which is generated by the effect of welding beam in the weld 2 has the shape of a Gaussian curve in an idealized manner, as is seen from FIG. 3 .
  • the heat input due to the annealing beam 15 takes place in the weld 2 during and even after the effect of the welding beam according to the inventive method in order to maintain the temperature of the weld within the temperature range between 500° C. and 800° C. for a longer period of time.
  • This temperature range between 500° C. and 800° C. represents the transformation range in which martensite formation takes place during weld cooling for quick passage through this temperature range according to the natural cooling rate.
  • the effect of annealing beam 15 holds the temperature of weld 2 in the temperature range of this transformation range for a longer period of time of, for example, 1-3 sec. This follows from the resultant temperature-time curve shown in FIG. 3 .
  • the temperature of the weld is found in the transformation range for a shorter or longer time period. It has been observed that martensite formation can be largely suppressed if the temperature of the weld can be held in the transformation range for at least a period of 1.5-2 sec.
  • the butt-joint welding method described above with simultaneous or subsequent thermal treatment of the weld by the annealing beam is applied in the same way for both of the inventive methods.
  • two uncoated steel sheets 1 , 1 ′ are first welded to each other in this way and are subsequently coated over the full surface with a metallic coating after welding, wherein the or each weld 2 is also coated with the metallic coating.
  • the full surface coating of the joined steel sheets 1 , 1 ′ is in this case effected in the known way, for example, by galvanic tinning or chrome plating in a known strip tinning and/or strip chrome plating plant.
  • steel sheets 1 , 1 ′ that have already been provided with a metallic coating are welded by the butt-joint welding method described above and treated thermally during or after the welding by means of annealing beam 15 . After cooling of the welds, these are provided with a strip-shaped metallic coating by electrodeposition.
  • FIG. 4 a device is shown for the two-sided application of metallic coating on the weld 2 , wherein FIG. 4 a shows the device in the process step during the electrodeposition on the weld and FIG. 4 b shows the same device during the implementation of a cleaning step for cleaning the electrocoated weld.
  • the device shown in FIG. 4 comprises two anode strips 4 , 5 that are directed vertically and are movable perpendicular to the surface of the steel sheets 1 , 1 ′. Both of the anode strips 4 , 5 are arranged aligned with each other on opposite sides of the steel sheets 1 , 1 ′ and are preferably floating with respect to each other.
  • the device further comprises a feed device for feeding fluid electrolyte which is used for electrodeposition on weld 2 .
  • the feed device is coupled to an electrolyte reservoir.
  • the device comprises an application device for application of electrolyte onto the weld 2 , and also comprises an anode 8 at which an electric potential difference can be applied relative to the steel sheets 1 , 1 ′.
  • a clamping device 11 is provided for clamping and fixing the steel sheets 1 , 1 ′, by means of which the steel sheets 1 , 1 ′ are positioned and fixed such that the two anode strips 4 , 5 are arranged on the top and bottom side's of the steel sheets 1 , 1 ′ running parallel to these sheets and lengthwise to the joint grooves 14 .
  • the length of the two anode strips 4 , 5 is at least the maximum width of steel sheet 1 to be treated (corresponding to the maximum length of the weld 2 to be treated).
  • FIG. 4 c the top anode strip 4 of the two anode strips shown in FIG. 4 a is shown in top view with the steel sheet 1 arranged below and two vertical guides 30 in which the anode strip 4 is guided.
  • the anode strips 4 , 5 are produced from a corrosion-stable material, for example, from metal, especially acid-resistant stainless steel, or from nonmetallic materials, for example ceramic.
  • the anode strips 4 , 5 are produced from an electrically insulating material since a protective device against electrical charging of anode strips 4 , 5 can be omitted.
  • the anode strips 4 , 5 preferably have a hollow profile which can be seen from the sectional representations of FIG. 4 a.
  • the application device for applying electrolyte onto the weld 2 is arranged inside the hollow anode strips 4 , 5 , wherein this application device of the embodiment shown in FIG. 4 a comprises a pad 7 which is made from electrically nonconductive, open-cell material.
  • the pad 7 can be open-cell foam or a felt or fleece material.
  • the pad 7 projects out of an opening which runs lengthwise to each anode strip 4 , 5 and protrudes slightly opposite the lower edges of anode strips 4 , 5 which face the steel sheets 1 , 1 ′.
  • the pad 7 is connected to a tube 6 inside the hollow profile of each anode strip 4 , 5 .
  • Outlet openings are incorporated in the tube 6 through which the electrolyte fluid flowing in the tube 6 flows into the pad 7 and can be absorbed from it.
  • an anode 8 is arranged within each anode strip 4 , 5 .
  • the anode 8 is formed from an electrically conductive tube, preferably a metallic tube, which runs within each anode strip 4 , 5 in the longitudinal direction.
  • the steel sheets 1 , 1 ′ which are joined to each other by the earlier described butt-joint welding method, are introduced into the treatment device and positioned such that the weld 2 runs parallel to the two anode strips 4 , 5 .
  • the treatment device comprises a clamping device 11 for positioning and fixing the steel sheets 1 , 1 ′ in this position.
  • This clamping device 11 comprises two pairs of clamping jaws 11 a and 11 b as shown in the embodiment of FIG. 4 a . These are arranged on the top and/or bottom side of the steel sheets 1 , 1 ′.
  • the clamping jaws are moveable perpendicular to the surface of the steel sheets 1 , 1 ′ just like the anode strips 4 , 5 , and each have a gasket 12 at their lower edge facing the steel sheets 1 , 1 ′. These are clamped between the pairs of clamping jaws 11 a , 11 b for positioning and fixing of the steel sheets 1 , 1 ′, wherein the gasket 12 prevents mechanical damage to the surfaces of the steel sheets when setting them, and moreover seals the processing space in the region around the weld 2 in a liquid-tight manner.
  • the surface of the steel sheet which has a waviness perpendicular to the direction of welding and of rolling due to internal stresses, is smoothed out.
  • the two anode strips 4 , 5 are placed on either side of the steel sheets 1 , 1 ′ in the region of weld 2 , with the anode strips 4 , 5 being moved in their respective guide 30 in the direction perpendicular to the surface of the steel sheets 1 , 1 ′.
  • the pad 7 is pressed onto the weld 2 with a prescribed pressure.
  • an electrical voltage is applied between anode 8 and steel sheets 1 , 1 ′, and simultaneously an electrolyte fluid is led through the feed device to the application device, by means of which the pad 7 is soaked with electrolyte fluid.
  • An electrolyte film is formed on the surface of the steel sheets 1 , 1 ′. This is shown in FIG. 4 a with the reference number 3 . Due to the voltage that has been applied between steel sheets 1 , 1 ′ (and/or weld 2 ) and anode 8 , the cations in the electrolyte migrate to the cathodically connected steel sheet and especially to the weld 2 . The electrolyte cations on the sheet surface and/or weld surface are deposited by uptake of electrons. The sheet thickness of the metal coat that has been deposited on the weld 2 is determined exclusively by the processing time, given constant electrical characteristic values and stable cation concentrations in the electrolyte that has a prescribed electrical conductivity. Said processing time can be preset via a timer.
  • the pad 7 must be renewed at regular time intervals and/or regenerated, since the open-cell structure of pad 7 can be adversely affected, especially due to salting out, and thus, a regular flow of electrolyte onto the surface of the steel sheet could be locally prevented.
  • the replacement and/or regeneration of pad 7 can be effected by the replacement of anode strips 4 , 5 .
  • an automated pad changing unit can be used, as is shown schematically in FIG. 5 .
  • This pad changing unit comprises a supply roll 18 on which the pad material is wound. This supply roll 18 is arranged next to each anode strip 4 , 5 .
  • fresh pad material can be drawn from the supply roll 18 by manual activation or automatically via pre-set time control and drawn into the pad-receiver of each anode strip 4 , 5 , while the used-up region of pad 7 is simultaneously wound onto a take-up roll 19 .
  • a take-up roll 19 is arranged next to each anode strip 4 , 5 on the side opposite the supply roll 18 .
  • the electrical voltage between the steel sheets 1 , 1 ′ and anode 8 is switched off and the supply of electrolyte is shut off.
  • the electrolyte fluid which remains on the steel sheet surface is kept in circulation to avoid salting out, and the anode strips 4 , 5 are driven to their initial position away from the sheet surface after turning off the electrical voltage and electrolyte supply, as is shown in FIG. 4 b.
  • the device has a cleaning device 13 with cleaning slides 13 a , 13 b that run in the horizontal direction parallel to the surface of the steel sheet, wherein a cleaning slide 13 a and 13 b , respectively is assigned to the top side and bottom side of the steel sheet.
  • a cleaning slide 13 a and 13 b respectively is assigned to the top side and bottom side of the steel sheet.
  • FIG. 6 the travel of cleaning slides 13 a , 13 b is shown schematically.
  • the cleaning slides 13 a , 13 b are guided in channels in the clamping jaws 11 .
  • the channels are designed in the shape of grooves 27 in which the guide webs 28 of the cleaning slide 13 engage, as shown in the sectional representation of FIG. 4 b.
  • a cleaning slide 13 a is shown in cross section.
  • Each cleaning slide 13 a , 13 b bears a high-pressure spray nozzle 15 through which water can be sprayed onto the surface of steel sheet 1 .
  • Each cleaning slide 13 a , 13 b further has a suction device 16 operated by vacuum.
  • Gaskets 14 are arranged on the bottom of each cleaning slide 13 which contacts the steel sheet surface, thus preventing damage to the surface and sealing the process space around the weld 2 in a leak-proof manner. Because of the leak-proof seal, the cleansing water cannot escape and external air cannot be sucked in from outside.
  • each cleaning slide 13 a , 13 b is driven over the steel sheet surface from its original position shown in FIG. 6 horizontally and lengthwise to the weld 2 .
  • water is sprayed through the nozzle 15 onto the steel sheet surface and the water-electrolyte mixture which is thereby formed is simultaneously sucked out by the suction device 16 .
  • the cleaning process can be repeated several times. The required number of cleaning cycles can be preset by a control device.
  • each cleaning slide 13 a , 13 b is brought back to its initial position.
  • the electrolyte fluid is supplied through the tube 6 in the embodiment of the coating device shown in FIG. 4 a .
  • the electrolyte fluid can also be supplied through a tube-shaped anode 8 , wherein the tube-shaped anode 8 likewise has outlet openings via which the electrolyte fluid can penetrate into the pad 7 that surrounds the anode 8 .
  • the anode tube 8 is preferably produced from an acid-resistant, electrically conductive material, for example, stainless steel in this embodiment.
  • the anode 8 is formed as slotted rectangular tube 20 ( FIG. 8 ) on whose bottom side are arranged sealing strips 21 .
  • the rectangular tube 20 is used as an anode 8 and for this purpose, has an electrical voltage applied to it referenced to the steel sheet 1 and is used simultaneously as a supply device for supplying electrolyte fluid and as an application device for applying the electrolyte onto the weld.
  • Such a rectangular tube 20 is arranged on the top side of the steel sheet running along the weld 2 , and a structurally identical rectangular tube 26 is arranged on the bottom side, as shown in FIG. 9 .
  • Both of the rectangular tubes 20 , 26 are connected to a reservoir 22 of an electrolyte fluid ( FIG. 9 ).
  • the electrolyte fluid is pumped into the rectangular tube 20 via a pump and sprayed onto the steel sheet surface in the region of weld 2 via spray nozzles.
  • the process space which is sealed around the weld 2 by the gaskets 21 , is flooded with electrolyte fluid.
  • Excess electrolyte fluid can be sucked from the surface of steel sheet 1 during the process by a suction device and is delivered to reservoir 22 for recycling.
  • cleaning of the steel sheet surface is performed by water cleansing after the completion of electrodeposition on weld 2 and suctioning off of the electrolyte-water solution.
  • each rectangular tube 20 , 26 is connected to water circulation unit 25 in this embodiment ( FIG. 9 ).
  • drying of the steel sheet surface preferably takes place, especially in the region of the electrocoated weld 2 .
  • the drying process can be implemented with compressed air or hot air.
  • air nozzles 17 are provided in the clamping jaws 11 a , 11 b , as is shown in FIG. 10 . Dry air can be blown onto steel sheet 1 at adjustable angles with these air nozzles 17 .
  • the degree of drying is controlled via the drying time, which is adjustable by means of a control device.
  • the welds 2 can be provided with a metallic strip-shaped coating with the described device in order to protect the welds 2 from corrosion. Due to thermal treatment of the welds during or after welding, the joined steel sheets 1 , 1 ′ can be easily workable even in the region of welds 2 , and are simultaneously protected against corrosion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Welding Or Cutting Using Electron Beams (AREA)
  • Arc Welding In General (AREA)
  • Laser Beam Processing (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Laminated Bodies (AREA)
US12/376,211 2006-08-04 2007-07-26 Method for producing a corrosion-resistant, workable sheet metal with full-surface coating of the joined, thermally treated steel sheets Abandoned US20120325379A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102006036871.1 2006-08-04
DE102006036871 2006-08-04
DE102007007590.3 2007-02-13
DE102007007590 2007-02-13
PCT/EP2007/057729 WO2008015158A2 (de) 2006-08-04 2007-07-26 Verfahren zur herstellung eines korrosionsbeständigen und umformbaren blechs mit vollflächigem beschichten der gefügten thermisch behandelten stahlbleche

Publications (1)

Publication Number Publication Date
US20120325379A1 true US20120325379A1 (en) 2012-12-27

Family

ID=38610086

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/376,211 Abandoned US20120325379A1 (en) 2006-08-04 2007-07-26 Method for producing a corrosion-resistant, workable sheet metal with full-surface coating of the joined, thermally treated steel sheets

Country Status (9)

Country Link
US (1) US20120325379A1 (de)
EP (1) EP2049300B1 (de)
JP (1) JP5106532B2 (de)
AT (1) ATE454241T1 (de)
BR (1) BRPI0714814A2 (de)
CA (1) CA2659753C (de)
DE (1) DE502007002575D1 (de)
ES (1) ES2338276T3 (de)
WO (1) WO2008015158A2 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160107554A1 (en) * 2013-09-09 2016-04-21 Sitech Sitztechnik Gmbh Method for stabilizing and/or for reducing tensions occurring within the wall-like structure by means of laser welding
WO2016101064A1 (en) * 2014-12-23 2016-06-30 Magna International Inc. Method of laser beam localized-coating
WO2017004314A1 (en) * 2015-06-30 2017-01-05 Magna International Inc. System for conditioning material using a laser and method thereof
RU2629127C1 (ru) * 2016-04-15 2017-08-24 Публичное акционерное общество "Синарский трубный завод" (ПАО "СинТЗ") Способ индукционной термической обработки сварного соединения
US10543565B2 (en) 2015-09-21 2020-01-28 Wisco Tailored Blanks Gmbh Laser welding method for producing a semi-finished sheet metal product made of hardenable steel and comprising a coating based on aluminium or aluminium-silicon
CN113242916A (zh) * 2018-12-20 2021-08-10 力拓艾尔坎国际有限公司 阳极组件以及包括该阳极组件的电解池

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008060467B4 (de) * 2008-12-05 2013-08-01 Thyssenkrupp Tailored Blanks Gmbh Verfahren zur Herstellung von maßgeschneiderten Blechbändern
JP5902599B2 (ja) * 2012-10-23 2016-04-13 本田技研工業株式会社 テーラードブランクの製造方法およびテーラードブランク
DE102013000796A1 (de) * 2013-01-18 2014-07-24 Messer Cutting Systems Gmbh Verfahren zum thermischen Schneiden eines Werkstück aus Stahl
CN105057902B (zh) * 2015-08-04 2018-07-06 武船重型工程股份有限公司 一种超厚板的拼接方法及吊具
JP7097206B2 (ja) * 2018-03-28 2022-07-07 株式会社アマダ レーザ加工装置，レーザ光による熱調質方法，及び熱調質材の製造方法
CN114734133A (zh) * 2022-04-25 2022-07-12 先导薄膜材料有限公司 高纯度铝与铝合金背板的焊接方法及其焊接工装

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2106922A5 (de) * 1970-09-29 1972-05-05 Comp Generale Electricite
US4441238A (en) * 1981-02-09 1984-04-10 Allied Tube & Conduit Corporation Continuous production of polished and buffed tubing
JPS6261790A (ja) * 1985-09-09 1987-03-18 Nippon Steel Corp 電磁鋼板のレ−ザビ−ム溶接方法
JPS63290700A (ja) * 1987-05-25 1988-11-28 Hitachi Ltd 溶接部の保護方法
US4879448A (en) * 1988-10-24 1989-11-07 Storage Technology Corporation Apparatus for laser welding and annealing
FR2713963B1 (fr) * 1993-12-21 1996-03-08 Lorraine Laminage Installation de raboutage et de soudage au moyen d'un faisceau laser de deux bobines de bandes métalliques pour former une bande métallique continue.
CN1043197C (zh) * 1995-04-29 1999-05-05 华中理工大学 镀层钢板激光焊缝表面在线同步熔镀方法
DE19809487A1 (de) * 1998-03-06 1999-09-09 Greising Verfahren und Vorrichtung zur Aufbringung einer räumlich begrenzten metallischen Deckschicht auf einer elektrisch leitenden Materialoberfläche
JP4577811B2 (ja) * 2002-12-27 2010-11-10 新日本製鐵株式会社 高張力鋼板レーザ溶接部の熱処理方法
FR2854827B1 (fr) * 2003-05-12 2006-05-05 Commissariat Energie Atomique Procede d'assemblage de deux toles revetues d'une couche protectrice

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10207611B2 (en) * 2013-09-09 2019-02-19 Sitech Sitztechnik Gmbh Method for stabilizing and/or for reducing tensions occurring within the wall-like structure by means of laser welding
US20160107554A1 (en) * 2013-09-09 2016-04-21 Sitech Sitztechnik Gmbh Method for stabilizing and/or for reducing tensions occurring within the wall-like structure by means of laser welding
US10807193B2 (en) 2014-12-23 2020-10-20 Magna International Inc. Method of laser beam localized-coating
CN107107268A (zh) * 2014-12-23 2017-08-29 麦格纳国际公司 激光束局部化涂覆的方法
CN107433394A (zh) * 2014-12-23 2017-12-05 麦格纳国际公司 激光束局部涂覆的方法
US10583528B2 (en) 2014-12-23 2020-03-10 Magna International Inc. Method of laser beam localized-coating
WO2016101064A1 (en) * 2014-12-23 2016-06-30 Magna International Inc. Method of laser beam localized-coating
US11607747B2 (en) 2014-12-23 2023-03-21 Magna International Inc. Method of laser beam localized-coating
WO2017004314A1 (en) * 2015-06-30 2017-01-05 Magna International Inc. System for conditioning material using a laser and method thereof
US11821053B2 (en) 2015-06-30 2023-11-21 Magna International Inc. System for conditioning material using a laser and method thereof
US10543565B2 (en) 2015-09-21 2020-01-28 Wisco Tailored Blanks Gmbh Laser welding method for producing a semi-finished sheet metal product made of hardenable steel and comprising a coating based on aluminium or aluminium-silicon
RU2629127C1 (ru) * 2016-04-15 2017-08-24 Публичное акционерное общество "Синарский трубный завод" (ПАО "СинТЗ") Способ индукционной термической обработки сварного соединения
CN113242916A (zh) * 2018-12-20 2021-08-10 力拓艾尔坎国际有限公司 阳极组件以及包括该阳极组件的电解池

Also Published As

Publication number Publication date
WO2008015158A2 (de) 2008-02-07
JP2009545455A (ja) 2009-12-24
BRPI0714814A2 (pt) 2014-02-25
CA2659753C (en) 2013-08-27
WO2008015158A3 (de) 2008-04-10
ATE454241T1 (de) 2010-01-15
DE502007002575D1 (de) 2010-02-25
EP2049300A2 (de) 2009-04-22
CA2659753A1 (en) 2008-02-07
JP5106532B2 (ja) 2012-12-26
ES2338276T3 (es) 2010-05-05
EP2049300B1 (de) 2010-01-06

Similar Documents

Publication Publication Date Title
CA2659753C (en) Method for producing a corrosion-resistant, workable sheet metal with full-surface coating of the joined, thermally treated steel sheets
CN107803593B (zh) 一种高频-激光填丝复合焊接装置及方法
JP5495118B2 (ja) 亜鉛めっき鋼板のレーザ重ね溶接方法
US5142119A (en) Laser welding of galvanized steel
CN106583925B (zh) 一种汽车用镀锌钢板的激光焊接方法
CN106695080A (zh) 船舶海工用板材的焊接方法
CN105583523A (zh) 一种超声辅助激光深熔焊接板材的方法
RU2560468C2 (ru) Способ повышения качества металлического покрытия стальной полосы
CN107363407B (zh) 一种多焦点激光加强电弧复合焊的方法
JP5473171B2 (ja) 建築部材の製造方法
KR20130034239A (ko) 테일러 웰디드 블랭크 제조방법 및 이를 위한 용접 이음부 재도금 장치
CN112222580A (zh) 一种热轧u肋双面焊接方法
CA2356512C (en) A method for closing and/or joining a connecting joint or joining seam between two pieces of galvanized sheet metal
RU2590787C2 (ru) Способ улучшения металлического покрытия на стальной ленте
CN111618434B (zh) 一种基于激光扫描的窄间隙厚板填丝焊接方法
JPS6150075B2 (de)
RU2625145C1 (ru) Способ электролитно-плазменной сварки изделий из алюминия и его сплава
JPS58103988A (ja) 板状部の連続溶接方法
CN104646954A (zh) 一种在线连续镀层工艺
US4461419A (en) Auxiliary apparatus for manufacturing strips and sheets, coated on one side with a protective coating
CN107914092A (zh) 一种油汀散热片用不锈钢的焊接工艺
JPS61270339A (ja) 耐溝食性に優れた溶接管の製造方法
WO2005105358A1 (en) Seam welding method of metal sheets
KR900003081B1 (ko) 최소한 한쪽면에 아연도금된 디이프 드로우 가능한 강판 또는 강편의 버트용접 방법
KR840002191B1 (ko) 용접관동체의 제조방법

Legal Events

Date Code Title Description
AS Assignment

Owner name: RASSELSTEIN GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BAULIG, HARALD;BAUMANN, BERND;KESSELEM, JOSEF;AND OTHERS;SIGNING DATES FROM 20090901 TO 20090925;REEL/FRAME:023454/0153

AS Assignment

Owner name: THYSSENKRUPP RASSELSTEIN GMBH, GERMANY

Free format text: CHANGE OF NAME;ASSIGNOR:RASSELSTEIN GMBH;REEL/FRAME:028332/0062

Effective date: 20120215

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION