EP1990444A2 - Procédé de post-traitement de liaisons soudées - Google Patents

Procédé de post-traitement de liaisons soudées Download PDF

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Publication number
EP1990444A2
EP1990444A2 EP08007714A EP08007714A EP1990444A2 EP 1990444 A2 EP1990444 A2 EP 1990444A2 EP 08007714 A EP08007714 A EP 08007714A EP 08007714 A EP08007714 A EP 08007714A EP 1990444 A2 EP1990444 A2 EP 1990444A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
weld
cover layer
aluminum
workpieces
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.)
Withdrawn
Application number
EP08007714A
Other languages
German (de)
English (en)
Inventor
Mustafa Kocak
Stefan Rikehr
Waman Vishwanath Vaidya
Frank GÄRTNER
Thorsten Stoltenhoff
Frank Kreye
Thomas Klassen
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.)
GKSS Forshungszentrum Geesthacht GmbH
Original Assignee
GKSS Forshungszentrum Geesthacht 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 GKSS Forshungszentrum Geesthacht GmbH filed Critical GKSS Forshungszentrum Geesthacht GmbH
Publication of EP1990444A2 publication Critical patent/EP1990444A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/02—Coating starting from inorganic powder by application of pressure only
    • C23C24/04—Impact or kinetic deposition of particles

Definitions

  • the present invention relates to a method for the post-treatment of a weld on a workpiece in order to improve the mechanical properties of the weld.
  • the problem is that in the area of the weld, tensile stresses form in the material of the weld itself as well as in the material of the adjacent workpieces. On the one hand, these tensile stresses can lead to a reduction in the strength of the material. On the other hand, due to the tensile stresses under load, formation of cracks in the area of the surface can occur which, on the one hand, further impair the strength of the weld seam and, on the other hand, accelerate the corrosion in this area.
  • the aluminum workpieces that are to be welded often consist of an aluminum alloy with a coating of pure aluminum, the coating serving as a "sacrificial anode" to protect the aluminum alloy of the workpiece from corrosion to protect.
  • this coating is destroyed by the welding process, so that in this area, the effect of the sacrificial anode is lost and the aluminum alloy of the workpieces is exposed here to a greater extent corrosion attacks.
  • the area of the weld is exposed by the mixing of the material of the coating base and thus an increased risk of corrosion. It would therefore further be desirable if, after the production of a weld on such workpieces, a sacrificial anode material would again be present in the area of the weld seam.
  • this object is achieved in that a cover layer is applied to the weld on a workpiece by cold gas spraying.
  • the weld can be formed before the application of the cover layer by any known from the prior art welding method, in particular gas welding, arc welding and laser welding come into question.
  • the weld can serve the purpose of connecting two components to a single workpiece or, on the other hand, of closing openings in a workpiece.
  • powdered material from which the top layer is formed is placed within a nozzle in a gas jet, so that the particles are accelerated to high speeds, typically at speeds above the speed of sound, and thus receive high kinetic energy. If the particles impinge on the workpiece to be coated or the surface of the weld, they form a dense, firmly adhering layer, as it due to the high kinetic energy and the resulting heat release when hitting the workpiece to a liability of the particles themselves and also comes on the workpiece.
  • details for cold gas spraying is incidentally on the DE 101 26 100 A1 directed
  • cold-gas-sprayed layers have compressive stress after being applied to a workpiece.
  • compression stresses are introduced into the workpiece itself during the coating process.
  • the size of the particles used in the cold gas spraying is between 10 and 60 ⁇ m, and preferably between 20 and 45 ⁇ m, it has been shown that good results can be achieved in terms of reducing the tensile stresses in the weld and the workpiece.
  • the method according to the invention has proven to be particularly advantageous with regard to workpieces whose material comprises aluminum or aluminum alloys. But it is also possible that the inventive method is applied to workpieces made of titanium or titanium alloys. In addition, the method according to the invention can be applied to workpieces made of steel, it being possible to restore the originally good corrosion properties in the region of the weld, in particular when galvanized steel workpieces are aftertreated. Furthermore, the method can also be applied to copper and copper alloys.
  • the material of the cover layer behaves anodically to the material of the weld.
  • the cover layer not only counteracts the tensile stresses, but also serves as a sacrificial anode with respect to the weld so that the material of the weld is not exposed to corrosion.
  • the material of the cover layer can also be chosen so that it also behaves anodically to the material of the workpiece and thus also acts as a sacrificial anode against this.
  • the properties can be restored, which, if the workpiece is provided with a coating designed as a sacrificial anode, were present before the formation of the weld.
  • the materials may be selected in such a way that the material of the workpieces comprises an aluminum alloy and the cover layer consists of aluminum, wherein the Workpieces in a further preferred manner also have a coating of aluminum.
  • a workpiece 1 with a weld seam 3 is shown, wherein the weld seam 3 can be formed by known welding methods, for example gas-melt welding, arc welding and laser welding.
  • the material of the workpiece 1 is an aluminum alloy, wherein on the workpiece 1 there is still a coating 5 of pure aluminum which serves as a sacrificial anode and which is interrupted in the region of the weld seam 3 due to the welding process is.
  • the thickness of the workpiece 1 may be between 0.5 and 10 mm in the example described here, and the coating 5 may be multi-layered.
  • workpieces made of copper or titanium and titanium or copper alloys are used.
  • workpieces made of steel it being possible in particular when galvanized steel workpieces to be treated to restore the originally good corrosion properties in the area of the weld seam.
  • the material of the weld 3 is formed due to the welding process of the material of the workpiece 1 itself and that of the coating 5 and thus less noble than the workpiece material. As a result, the weld 3 is initially more susceptible to corrosion than the rest of the workpiece 1 Weld 3 and the adjacent to her area of the workpiece 1 before coating under tensile stresses, so that the strength and corrosion resistance, as explained above, are reduced here (see arrows 7).
  • the workpiece 1 is arranged at a distance of between 10 and 60 mm in front of a cold gas spraying nozzle 9, which is shown here only schematically.
  • particles having a size between 10 and 60 ⁇ m and preferably between 20 and 45 ⁇ m in a gas stream 11 are typically accelerated to speeds above the speed of sound.
  • the material of the particles in the present embodiment is aluminum, and nitrogen is used as the process gas, wherein the process gas can be preheated and has a pressure between 5 to 60 bar and preferably between 20 to 40 bar.
  • the particles in the gas stream 9 strike the workpiece 1 in the area of the weld seam 3 and form a cover layer 13 over the weld seam 3.
  • the gas stream 9 has a typical diameter of 2 to 10 mm, so preferably several times in lines over the range of Weld 3 is applied to the cover layer 13 of pure aluminum with a thickness of 0.05 to 10 mm applied to the region of the weld 3.
  • cover layer 13 according to the invention to the weld seam 5 by means of cold gas spraying results in adhesion of the particles to one another in the cover layer 13 and on the workpiece 1 due to the high kinetic energy of the particles and the resulting heat release upon impact with the workpiece 1 comes.
  • 13 compressive stresses (arrow 15) are built up, inter alia, by the constant impact of other solid particles in the cover layer.
  • the cover layer 13 is made of pure aluminum in the preferred embodiment described here, the cover layer 13 behaves anodically both to the workpieces 1 and to the weld 3, so that also in this way the corrosion resistance of the welded workpiece is improved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Arc Welding In General (AREA)
  • Laser Beam Processing (AREA)
  • Coating By Spraying Or Casting (AREA)
EP08007714A 2007-05-09 2008-04-21 Procédé de post-traitement de liaisons soudées Withdrawn EP1990444A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007021736A DE102007021736A1 (de) 2007-05-09 2007-05-09 Verfahren zur Nachbehandlung von Schweißverbindungen

Publications (1)

Publication Number Publication Date
EP1990444A2 true EP1990444A2 (fr) 2008-11-12

Family

ID=39514641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08007714A Withdrawn EP1990444A2 (fr) 2007-05-09 2008-04-21 Procédé de post-traitement de liaisons soudées

Country Status (4)

Country Link
US (1) US20080277458A1 (fr)
EP (1) EP1990444A2 (fr)
CA (1) CA2630359A1 (fr)
DE (1) DE102007021736A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11662300B2 (en) 2019-09-19 2023-05-30 Westinghouse Electric Company Llc Apparatus for performing in-situ adhesion test of cold spray deposits and method of employing
US11898986B2 (en) 2012-10-10 2024-02-13 Westinghouse Electric Company Llc Systems and methods for steam generator tube analysis for detection of tube degradation
US11935662B2 (en) 2019-07-02 2024-03-19 Westinghouse Electric Company Llc Elongate SiC fuel elements

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027491B4 (de) * 2008-06-10 2012-03-15 Benteler Automobiltechnik Gmbh Kraftfahrzeug-Achs- oder Fahrwerksbauteil

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10126100A1 (de) 2001-05-29 2002-12-05 Linde Ag Verfahren und Vorrichtung zum Kaltgasspritzen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02225654A (ja) * 1989-02-23 1990-09-07 Furukawa Electric Co Ltd:The 金属パイプの製造方法
JPH073422A (ja) * 1993-05-25 1995-01-06 Nisshin Steel Co Ltd Ａｌめっき電縫管の溶接ビード切削部の補修方法
DE19638225C2 (de) * 1996-08-22 1999-09-02 Castolin Sa Verfahren zum Herstellen einer korrosionsbeständigen Verbindung von Rohren
US7066375B2 (en) * 2004-04-28 2006-06-27 The Boeing Company Aluminum coating for the corrosion protection of welds

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10126100A1 (de) 2001-05-29 2002-12-05 Linde Ag Verfahren und Vorrichtung zum Kaltgasspritzen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11898986B2 (en) 2012-10-10 2024-02-13 Westinghouse Electric Company Llc Systems and methods for steam generator tube analysis for detection of tube degradation
US11935662B2 (en) 2019-07-02 2024-03-19 Westinghouse Electric Company Llc Elongate SiC fuel elements
US11662300B2 (en) 2019-09-19 2023-05-30 Westinghouse Electric Company Llc Apparatus for performing in-situ adhesion test of cold spray deposits and method of employing

Also Published As

Publication number Publication date
US20080277458A1 (en) 2008-11-13
DE102007021736A1 (de) 2008-11-13
CA2630359A1 (fr) 2008-11-09

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