US20110108170A1 - Method of preparation prior to the welding of lithium-aluminium alloy products - Google Patents

Method of preparation prior to the welding of lithium-aluminium alloy products Download PDF

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US20110108170A1
US20110108170A1 US13/002,153 US200913002153A US2011108170A1 US 20110108170 A1 US20110108170 A1 US 20110108170A1 US 200913002153 A US200913002153 A US 200913002153A US 2011108170 A1 US2011108170 A1 US 2011108170A1
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product
weight
process according
lithium
aluminum
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Inventor
Frank Eberl
Stephane Jambu
Christian Barthelemy
Gaelle Pouget
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Constellium Issoire SAS
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Alcan Rhenalu SAS
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Assigned to ALCAN RHENALU reassignment ALCAN RHENALU ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POUGET, GAELLE, BARTHELEMY, CHRISTIAN, JAMBU, STEPHANE, EBERL, FRANK
Publication of US20110108170A1 publication Critical patent/US20110108170A1/en
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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
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • 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
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or 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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
    • B23K11/18—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of non-ferrous metals
    • B23K11/185—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of non-ferrous metals of aluminium or aluminium 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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/34—Preliminary treatment
    • 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
    • B23K15/0033—Preliminary treatment
    • 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
    • B23K15/0093—Welding characterised by the properties of the materials to be welded
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/60—Preliminary treatment
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/235—Preliminary treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/72—Temporary coatings or embedding materials applied before or during heat treatment during chemical change of surfaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • 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
    • B23K2103/10—Aluminium or alloys thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y10T428/12764—Next to Al-base component

Definitions

  • the present invention relates to aluminum-lithium alloys in general and, in particular, such products as used in the aircraft industry and the welding of these.
  • Al—Li alloys have long been recognized as an effective solution for reducing the weight of structural elements because of their low density. Their use is systematically considered for the most modern aeronautical structures. In addition, the use of welding instead of the usual techniques of riveting is also a current trend in the field of aeronautical engineering. It therefore goes without saying that in order to be used in aeronautical engineering, Al—Li alloys must preferably be able to be fusion-welded without difficulty.
  • U.S. Pat. No. 5,032,359 describes a family of weldable Al—Li alloys, the Aluminum-Copper-Lithium-Magnesium-Silver alloys. These alloys are also known under the trade name of “WELDALITE®” which particularly stresses their weldability. However, it was recognized in this initial patent and the later literature that this type of alloy was sensitive to the formation of porosities during welding. The mechanism behind this problem is poorly understood; it seems specific to Al—Li alloys.
  • This treatment can prove to be difficult to perform homogeneously, in particular on extruded sections of complex shape.
  • chemical etching of about 250 ⁇ m is difficult to perform accurately for thin parts, typically about 1 to 2 mm: etching on both faces may account for approximately 25 to 50% of the final thickness which presents technical problems for respecting thickness tolerances and must be taken into account for dimensioning the parts.
  • this treatment causes a metal loss which is economically very unfavorable, in particular for thin parts of low thickness.
  • U.S. Pat. No. 6,881,491 describes a process for protecting an aluminum surface able to be coated in order to avoid blistering during heat treatment. This process is not intended for surface preparation before welding of aluminum lithium alloys.
  • patent application EP-A-0 882.809 indicates treatments containing small quantities of fluorine to prevent oxidation, but does not reveal their use before welding or for aluminum-lithium alloys.
  • the subject of the invention is a process for preparing an aluminum lithium alloy product for it to be fusion-welded, including the successive stages of:
  • Another subject of the invention is a fusion-welded assembly between a first aluminum alloy member including at least 1.4% of lithium by weight and at least one second metal alloy member, the first member being a flat-rolled or extruded product of thickness less than 5 mm and preferably less than 2 mm, the first member having been prepared by the process according to the invention, characterized in that the weld is substantially free from porosities.
  • Still another subject of the invention is a fuselage panel including an assembly welded according to the invention.
  • FIG. 1 classification of quality in terms of porosity of the welded joints
  • FIG. 2 profiles used for the tests
  • Dry coating is taken to mean the state reached by the coating when it is dry throughout its thickness as defined by standard ISO 9117-90, which is different from a coating that is dry on the surface while the great majority of the coating has not yet stabilized.
  • the process according to the present invention is a process for preparing an aluminum lithium alloy product to be fusion-welded.
  • Fusion welding is taken to mean processes, such as spot welding, flash welding, laser welding, arc welding, electron beam welding, in which welding is carried out above the melting point of the aluminum-lithium alloy, in the liquid phase.
  • aluminum-lithium alloy is taken to mean alloys including at least 0.8% of lithium by weight.
  • the process according to the invention is particularly advantageous for alloys including at least 1.4% of lithium by weight.
  • the process according to the present invention is applied to an alloy product selected from the group made up of alloys 2090, 2091, 2196, 2097, 2197, 2297, 2397, 2099, 2199, 8090, 8091, 8093.
  • the process according to the invention is applied to an alloy 2196 product.
  • Hot-working is taken to mean an operation for deforming a block obtained for example by semi-continuous casting.
  • Hot-working of aluminum lithium alloys is carried out typically at an initial welding temperature greater than 350° C. or 400° C.
  • Hot-working operations are typically rolling, extruding and forging. In a preferred embodiment of the invention, the hot-working operation is hot extruded.
  • the hot-worked product can then be cold-worked in order to obtain a thinner product.
  • Cold-worked operations are for example cold rolling, drawing and/or hammering.
  • At least one surface intended to be welded of the hot-worked and optionally cold-worked product is then cleaned.
  • the purpose of cleaning is to eliminate the main residues from the hot-working stages. These residues are primarily hot-working oils and particles: oxides and/or metal particles. Cleaning can be carried out by any means suitable for eliminating these residues. Cleaning is not surface etching, so the thickness of metal eliminated during cleaning is less than 20 ⁇ m per side and preferably less than 10 ⁇ m per side.
  • Chemical cleaning is typically carried out using an organic solvent such as for example an alcohol, a ketone or an alkane, or an alkaline grease-remover such as for example a grease-remover containing soda, potash or sodium carbonate, or an acid grease-remover, for example a grease-remover containing chromic acid, sulfuric acid or phosphoric acid.
  • an organic solvent such as for example an alcohol, a ketone or an alkane
  • an alkaline grease-remover such as for example a grease-remover containing soda, potash or sodium carbonate
  • an acid grease-remover for example a grease-remover containing chromic acid, sulfuric acid or phosphoric acid.
  • cleaning is therefore carried out using one only family: cleaning by organic solvent or cleaning by alkaline degreasing or cleaning by acid degreasing.
  • cleaning is carried out by treatment with an aqueous solution with a pH greater than 9. Cleaning can be followed by surface rinsing, for
  • the surface so cleaned is then covered with a coating whose characteristics when dry are a quantity ranging between 0.1 and 5 mg/m2 and preferably between 0.5 and 4 mg/cm2, and a fluorine concentration of at least 10% by weight, and preferably of at least 25% by weight.
  • the coating can be deposited in the form of a solution, typically by immersion or spraying or in the form of powder, typically by electrostatic powdering.
  • the solvent is then evaporated by any suitable means in order to obtain a dry coating.
  • a dry coating can be obtained directly.
  • Many fluorinated substances can be used to reach the desired fluorine concentration in the dry coating.
  • the fluorine is in the form of a metal fluorine salt or a fluorinated compound.
  • Useful examples of salts within the framework of the invention are given in Table 1. Fluxes of the Nocolok® brand can be used advantageously. Most are products containing aluminum and potassium fluoride with the general formula K x Al y F z possibly containing various additives.
  • the coating comprises a binder whose concentration when dry lies between 5% and 50% by weight.
  • the binder makes it possible to obtain a homogeneous and reproducible deposit of the fluorinated substance.
  • a thickener is typically used, such as for example those used in the food, cosmetic or painting industry.
  • Carboxymethyl cellulose is a useful binder within the framework of the invention.
  • a coupling agent can also advantageously be used in coatings deposited from an aqueous solution.
  • silanes are particularly advantageous.
  • silane can be any silane of general formula R′Si (OR)3, where R′ is a group containing at least one organic radical and where OR is an alkoxy radical.
  • an aminosilane or an epoxy silane is used, such as, for example, the silanes AMEO (3-aminopropyltriethoxysilane) or Glymo: (3-glycidopropyltrimethoxysilane).
  • the binder is typically a polymeric compound.
  • Useful polymers within the framework of the invention comprise epoxy resins, polyurethane resins, polyolefin resins, polyacrylate resins, polyester resins, latexes, alkyl silicone resins and polyisocyanate resins. The use of alkyl silicone resins is preferred.
  • the coating is deposited from an aqueous solution and comprises when dry, as a percentage by weight, between 75% and 95% of NaBF 4 , between 0 and 15% of carboxymethyl cellulose and between 0 and 15% of a silane.
  • the coating according to this first embodiment does not comprise any other compounds than NaBF4, carboxymethyl cellulose and silane.
  • the dry coating deposited preferably by electrostatic powdering comprises, as a percentage by weight, between 50% and 100% of K X Al Y F Z , between 0 and 5% of Cs x Al y F and between 0 and 50% by weight of a binder, preferably an alkyl silicone resin.
  • the coating according to this first embodiment does not comprise any other compound than K X Al Y F Z , Cs x Al y F, a binder.
  • Cleaning and coating deposit are not necessary over all the surface of the product because the invention relates to the improvement of the quality of the welded joint and only surfaces intended to be welded therefore require treatment. However, it may be advantageous to carry out these cleaning and deposit stages on the majority or preferably on all the surface of the product, because this has an advantage in terms of simplicity and reproducibility of the treatment.
  • solution heat-treatment is performed at a temperature higher than approximately 450° C. followed by quenching.
  • This is a conventional operation on aluminum-lithium alloys which is carried out in ambient air or in a more slightly oxidizing atmosphere such as one including argon, helium, C02, nitrogen, alone or in a mixture.
  • An advantage of this invention is to obtain welds without porosities whatever the atmosphere used during the solution heat-treatment.
  • the invention may also be advantageous if one carries out intermediate softening heat treatments at a temperature higher than 250° C. or 300° C. during the stages of cold working, for example, between cold rolling runs for sheets or drawing for tubes.
  • at least one surface covered with a coating of the product placed in the solution obtained in this way is cleaned.
  • the coating is at least partially removed.
  • residues of the coating remain present on the surface. These residues may give an undesirable appearance to the product and/or prove to be awkward during welding operations. They may, if necessary be cleaned, the conditions of cleaning already described being suitable.
  • the coatings including a fluorinated substance of the NaBF4 or KBF4 type are advantageous because in the conditions of the invention, no visually apparent residues remain after solution heat-treatment and quenching.
  • the coatings including a fluorinated substance of type K x Al y F z and/or Cs x Al y F z are also advantageous because in the residues which remain after solution heat-treatment and quenching the welding operations do not hinder fusion.
  • the product resulting from the preparing process according to the invention is ready to be fusion-welded. Fusion welding is carried out using any fusion welding technique. In one embodiment of the invention, fusion welding is performed by laser welding in an inert atmosphere. The preparation made confers great stability on the aluminum-lithium alloy product. Fusion welding can if necessary be carried out several weeks after the end of the treatment. Preparation of the Product According to the Invention Means that Fusion Welds substantially free from porosities are obtained.
  • the invention is particularly advantageous when the hot-worked and optionally cold-worked product is a flat-rolled or extruded product with thickness lower than 5 mm and preferably lower than 2 mm.
  • the invention therefore makes it possible to manufacture a fusion welded assembly, with a weld substantially free from porosities between a first aluminum alloy member including at least 1.4% of lithium by weight and at least one second metal alloy member, in which the first member is a flat-rolled or extruded product of thickness less than 5 mm and preferably less than 2 mm, the first member having been prepared by the process according to the invention.
  • the thickness tolerance of the first member is plus or minus 0.20 mm, preferably plus or minus 0.15 mm and preferably still plus or minus 0.10 mm.
  • the first member and the second member are worked products, typically a extruded section, a sheet, a tube, a bar or a forged part.
  • the possibility of obtaining such a thickness tolerance, in particular for products of low thickness, is a technical advantage of the invention because with processes according to prior art, using chemical etching of 0.2 mm to 0.25 mm on each face which can account for approximately 25 to 50% of the final thickness of the product, it is difficult to obtain such tolerances.
  • the invention is particularly advantageous when the two members of the welded assembly are made of aluminum-lithium alloy, as it is more difficult in this case to obtain welds substantially free from porosities.
  • the welded joint comprises at least one second aluminum alloy member including at least 0.8% of lithium by weight.
  • the second member is a titanium alloy and the assembly is preferably a “welding-brazing” operation in which the aluminum lithium alloy member undergoes fusion but not the titanium alloy member.
  • the second member is, in any product, weldable by fusion with the first member, in particular any aluminum alloy.
  • the first member is a extruded section, preferably made of alloy 2196 and the second member is a sheet or a extruded section.
  • Assemblies welded according to the invention find particularly advantageous applications in aeronautical engineering with regard to the manufacture of structural elements.
  • structural element refers to an element used in mechanical engineering for which the mechanical, static and/or dynamic characteristics are of particular importance for the performance and the integrity of the structure, and for which a structural analysis is generally prescribed or carried out. These are typically mechanical parts the failure of which is likely to endanger the safety of said construction, its users or others.
  • these structural elements comprise the parts which make up the fuselage (such as the fuselage skin, stringers, bulkheads, circumferential frames), the wings (such as the wing skin, stringers or stiffeners, ribs and spars) and the tail unit, made up of horizontal and vertical stabilizers, as well as floor beams, seat tracks and doors.
  • the fuselage such as the fuselage skin, stringers, bulkheads, circumferential frames
  • the wings such as the wing skin, stringers or stiffeners, ribs and spars
  • the tail unit made up of horizontal and vertical stabilizers, as well as floor beams, seat tracks and doors.
  • the assemblies welded according to the invention are used for the manufacture of fuselage panels.
  • extruded sections made of alloy AA2196, thickness 1.6 mm and 3.2 mm in state T 4 were fusion welded.
  • the extruded sections of thickness 1.6 mm and thickness 3.2 mm are shown in FIG. 2 .
  • Solution heat-treatment was 45 minutes at 524° C.
  • the welding lines were made by laser welding with a filler wire made of alloy 4047, a power level of 2300W and a welding speed of 5.4 m/min, in an atmosphere made up of a mixture of Ar (30%) and He (70%).
  • Etching with a controlled thickness ranging between 0 and 300 ⁇ m per face was carried out using an alkaline etching solution.
  • FIG. 1 illustrates 4 levels of porosities used to evaluate the results obtained.
  • Level A corresponds to the presence of at the most a very low number of pores, the welding is substantially free from porosities, and weld quality is good.
  • Level B corresponds to a higher pore density than that of level A, the pore diameter remaining lower than 0.5 mm.
  • Level C corresponds to a still higher density than that of level B, the pore diameter remaining lower than 1.5 mm.
  • Level D corresponds to a high pore density, certain pores having a diameter greater than 1.5 mm.
  • extruded sections made of alloy AA2196, thickness 1.6 mm the cross-section of which is described in FIG. 2 were coated with the products indicated in table 3, after cleaning in an alkaline medium followed by rinsing in de-ionized water and neutralization treatment in 58% by volume nitric acid for 1 minute and rinsing in de-ionized water. After drying the coating, the amount deposited was measured and the extruded sections underwent solution heat treatment and were quenched before undergoing welding lines in conditions identical to those of example 1. The results in terms of the quality of the welded assembly are also indicated in table 3.
  • Extruded sections of thickness 1.6 mm made of alloy AA2196, of cross-section identical to that of the preceding examples were obtained by casting billets the composition of which is supplied and extruding at a temperature greater than 400° C. Surface preparation treatments before solution heat-treatment were carried out. First of all the extruded sections were cleaned in an alkaline solution, followed in certain cases by treatment in an acid solution. Three types of treatments were then carried out: a first treatment containing sodium fluoroborate (NaBF4), a second treatment containing boron oxide and a third treatment based on aluminum and potassium fluoride (KXAlYFZ).
  • NaBF4 sodium fluoroborate
  • KXAlYFZ aluminum and potassium fluoride
  • the KXAlYFZ treatment contained the flux referenced by Nocolok®Cs FLUXTM, this flow containing between 95 and 100% of aluminum and potassium fluoride K2AlF5 and less than 5% of cesium fluoroaluminate CSAlF4.
  • a polymethylsiloxane resin SILRES® MK powder by Wacker Chimie was added in certain compositions.
  • Glymo silane (glycidopropyltrimethoxysilane) was added to the first treatment.
  • various solution heat-treatment conditions were used.
  • Two furnace atmospheres were tested: a standard atmosphere and a deliberately humidified atmosphere, in order to create more severe conditions.
  • the NaBF4 treatment makes it possible to obtain satisfactory results in the majority of cases. Only the most severe conditions (45 min 524° C.-humid air) lead to a level C porosity density. It is also to be noted that acid treatment after the cleaning operation in an alkaline medium does not provide any advantage, exactly identical results being obtained with or without this additional treatment.
  • the B203 treatment did not make it possible to obtain favorable results homogeneously and reproducibly. For this reason, several levels of porosity density observed locally have been indicated. In addition, many residues are to be observed on the surface after the stages of solution heat-treatment and quenching.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Arc Welding In General (AREA)
US13/002,153 2008-07-07 2009-07-03 Method of preparation prior to the welding of lithium-aluminium alloy products Abandoned US20110108170A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR08/03849 2008-07-07
FR0803849A FR2933424B1 (fr) 2008-07-07 2008-07-07 Procede de preparation avant soudage de produits en alliage aluminium-lithium
PCT/FR2009/000830 WO2010004132A1 (fr) 2008-07-07 2009-07-03 Procede de preparation avant soudage de produits en alliage aluminium-lithium

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CN112719553A (zh) * 2020-12-18 2021-04-30 北京航星机器制造有限公司 一种铝锂合金中厚板的电子束焊接方法

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CN102189350B (zh) * 2011-04-18 2012-10-03 兰州威特焊材炉料有限公司 Sal1460铝锂合金tig/mig焊丝
CN102632350A (zh) * 2012-04-26 2012-08-15 广州有色金属研究院 一种钎焊铝制热交换器的无腐蚀钎剂
CN103008399B (zh) * 2012-12-26 2015-02-25 中国航空工业集团公司第六三一研究所 一种钎焊厚度大于15mm厚板的校平方法
CN106312464A (zh) * 2016-11-03 2017-01-11 贵州航飞精密制造有限公司 一种铜衬套的加工工艺方法
WO2019125595A1 (en) * 2017-12-21 2019-06-27 Novelis Inc. Aluminum alloy articles having improved bond durability and inert surface aluminum alloy articles and methods of making and using the same
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CN112719553A (zh) * 2020-12-18 2021-04-30 北京航星机器制造有限公司 一种铝锂合金中厚板的电子束焊接方法

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FR2933424A1 (fr) 2010-01-08
ES2398537T3 (es) 2013-03-20
US20140037984A1 (en) 2014-02-06
EP2321436B1 (de) 2012-10-31
WO2010004132A1 (fr) 2010-01-14
CN102083584B (zh) 2013-12-25
CA2730070A1 (fr) 2010-01-14
EP2321436A1 (de) 2011-05-18
BRPI0915699B1 (pt) 2018-01-09
CN102083584A (zh) 2011-06-01
BRPI0915699A2 (pt) 2016-02-10
CA2730070C (fr) 2016-08-16

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