EP2279056A1 - Mélange de gaz protecteur pour le soudage à l arc d aluminium et d alliages de celui-ci - Google Patents

Mélange de gaz protecteur pour le soudage à l arc d aluminium et d alliages de celui-ci

Info

Publication number
EP2279056A1
EP2279056A1 EP09733253A EP09733253A EP2279056A1 EP 2279056 A1 EP2279056 A1 EP 2279056A1 EP 09733253 A EP09733253 A EP 09733253A EP 09733253 A EP09733253 A EP 09733253A EP 2279056 A1 EP2279056 A1 EP 2279056A1
Authority
EP
European Patent Office
Prior art keywords
vpm
helium
nitrogen
welding
protective gas
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Withdrawn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
EP09733253A
Other languages
German (de)
English (en)
Inventor
Bernd Hildebrandt
Achim Wankum
Michael Wolters
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.)
Messer Group GmbH
Original Assignee
Messer Group 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 Messer Group GmbH filed Critical Messer Group GmbH
Publication of EP2279056A1 publication Critical patent/EP2279056A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
    • B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/10—Aluminium or alloys thereof

Definitions

  • the invention relates to a protective gas for arc welding of aluminum and aluminum alloys.
  • arc welding is understood as meaning all variations of arc welding with a consumable or non-consumable electrode using a protective gas, in particular metal inert gas (MIG), metal active gas (MAG) and tungsten inert gas welding processes (TIG).
  • MIG metal inert gas
  • MAG metal active gas
  • TIG tungsten inert gas welding processes
  • the special features of welding aluminum and aluminum alloys result from the property of aluminum to form an oxide layer on the surface immediately upon contact with atmospheric oxygen.
  • the formation of the firmly adhering oxide on the surface is the result of the base character of aluminum.
  • the purpose of the welding protection gas is to protect both the weld pool and the consumable filler from oxidation by atmospheric oxygen and at the same time to increase the electrical conductivity of the electrical arc path between the electrode and the workpiece.
  • Argon or an argon-helium gas mixture is usually used as protective gas. Although the latter are more expensive, the mixture component helium leads due to a hotter arc and a more favorable energy distribution in the arc to a better penetration behavior and allows higher welding speeds.
  • helium can contribute to the reduction or avoidance of pores and reduce the consumption of filler metal.
  • the problem with shielding gas mixtures containing a high proportion of helium is the high cost of helium, the tendency of helium to expand the arc, and the increasing instability of the arc with increasing helium content.
  • Admixtures in the two- to three-digit vpm range (0.001% to 0.1%) are often sufficient to achieve measurable effects.
  • a protective gas mixture of argon and one or more components from the group helium, hydrogen, oxygen and carbon dioxide with an admixture of 80 to at most 250 vpm of nitrogen, preferably 120 to 180 vpm of nitrogen, known in the TIG -, MIG, MAG and plasma welding of steel materials, copper, nickel and aluminum can be used.
  • the inert gas leads to a Einbrandintensivitation without deteriorating the Zwangslagen s.
  • a protective gas for arc welding of steel and non-ferrous materials such as aluminum which consists of argon or an argon-helium-nitrogen mixture with an admixture between 50 and 450 vpm nitrogen monoxide (NO).
  • a specified composition of this inert gas mixture comprises 150 vpm of nitrogen, 300 vpm of nitric oxide, 10 vol .-% helium and argon as the remainder.
  • the inert gas is in the TIG AC welding a stable quiet arc with higher energy input and lower acoustic emission, better wetting at the Seam edges, a good penetration profile and a weld with very finely scaly appearance effect.
  • the problem is, however, the proportion of corrosive and toxic nitric oxide.
  • DE 27 48 417 C2 discloses a process for reducing harmful ozone formed by welding by adding a small amount (25 to 50 vpm) of nitrogen oxides to the argon used in the TIG welding as protective gas.
  • nitrogen oxides are used as ozone-reducing nitrogen oxides.
  • EP 0 475 030 B1 describes a protective gas mixture for the TIG, MIG and MAG welding of aluminum, which consists of argon or an argon-helium Mixture with an admixture of 80 to 250 vpm of nitrogen.
  • TIG AC welding this creates a quiet, stable burning and concentrated arc and increased energy input.
  • MIG welding sagging of the fillet welds
  • N 2 O nitrogen oxide
  • TIG welding seam discoloration
  • MIG welding severe sagging of the fillet welds
  • N 2 O in the shielding gas reacts with oxygen to form nitric oxide (NO) and nitrogen dioxide (NO 2 ), which have a corrosive and toxic effect, thus endangering both the user and the welding result.
  • NO nitric oxide
  • NO 2 nitrogen dioxide
  • a protective gas mixture described in EP 0 761 380 A1 for TIG AC welding of aluminum materials comprises a ternary system of at least 50% by volume of helium, 300 to 1000 vpm of nitrogen, and the remainder of argon. Based on the approach that helium in the shielding gas on the one hand makes it difficult to switch the polarity of the tungsten electrode from emission to reception due to its low promotion of gas ionization compared to argon, but on the other hand increases the penetration depth and compactness of the weld bead in TIG welding of aluminum, should said protective gas mixture, the positive effect of helium are utilized without significantly affecting the arc stability or the welding rate.
  • EP 0 949 038 A1 discloses a protective gas mixture which, in addition to argon and helium, contains at least a proportion of from 300 vpm to 1000 vpm of nitrogen and whose helium content is less than 50% by volume.
  • the nitrogen content should be at stable and smooth arc and high welding rate lead to a deep and round penetration of good quality with seam geometry without annoying seam discoloration.
  • the present invention has for its object to show for the arc welding of aluminum and its alloys an alternative to the known shielding gases, which leads to good welding results and reduces the health burden on the user and the burden on the environment.
  • a protective gas mixture containing up to 70 vpm nitrous oxide (N 2 O), 250 to 1000 vpm of nitrogen, balance argon and / or helium.
  • N 2 and N 2 O counteracts the property of helium to expand the arc, thereby increasing the spatial concentration of the arc. Furthermore, the stability of the arc is ensured even at higher levels of helium.
  • the ozone-reducing effect of the N 2 O content leads to an improvement in terms of occupational safety and environmental protection.
  • the content of nitrogen which is much higher than that of the N 2 O content, counteracts the formation of corrosive and toxic NO and NO 2 when using He-Ar mixtures doped only with N 2 O, which in turn further reduces the health burden on the user and the environment is reduced.
  • the proportion of N 2 O is preferably between 50 and 70 vpm.
  • An amount of less than 70 vpm N 2 O still has a positive effect in terms of ozone reduction and on the stability of the arc; in the case of N 2 O contents of more than 50 ppm, but in particular between 10 and 50 ppm, these advantageous effects are still present but less pronounced.
  • the nitrogen content in the quaternary mixture Ar-He-N 2 -N 2 O is adapted to the helium content.
  • the preferred nitrogen content increases with increasing helium content, but remains in the range of below 1000 vpm.
  • the content of N 2 O in the protective gas mixture does not changed.
  • preferred mixtures contain the following nitrogen contents (in a
  • protective gas according to the invention for TIG and MIG welding of aluminum contain admixtures of oxygen, carbon dioxide and / or nitrogen monoxide.
  • active components By incorporating active components, improved penetration is achieved, thus further increasing overall weld quality.
  • the admixtures are preferably above 10 vpm to below 100 vpm, all admixtures taken together preferably above 10 vpm to below 300 vpm.
  • the protective gas according to the invention is suitable for arc welding of aluminum or aluminum alloys both with a consumable and non-consumable electrode.
  • a stable and quiet arc with high energy input easy switching of the polarity of the tungsten electrode, an excellent penetration profile, a high energy input, a good quality of the weld, in particular without disturbing seam discoloration and pores, as well as a high welding speed and a good forced attitude behavior is achieved.
  • NO and NO 2 By reducing the formation of NO and NO 2 , the burden on humans and the environment compared to the use of mixtures according to the prior art is substantially reduced.

Abstract

L'invention concerne un gaz protecteur pour le soudage à l'arc MIG/TIG d'aluminium, le gaz comprenant un mélange quaternaire d'argon, d'hélium, d'azote et d'oxyde de diazote, la proportion d'oxyde de diazote allant jusqu'à 70 vpm, et étant de préférence comprise entre 50 et 70 vpm, et la proportion d'azote étant comprise entre 250 et 1000 vpm, mais augmentant cependant dans ces limites à cause de l'augmentation de la proportion d'hélium. Grâce au mélange de gaz selon l'invention, on obtient un bon résultat de soudage et on améliore nettement la situation concernant la protection de l'environnement et du travail.
EP09733253A 2008-04-19 2009-04-06 Mélange de gaz protecteur pour le soudage à l arc d aluminium et d alliages de celui-ci Withdrawn EP2279056A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008019859A DE102008019859A1 (de) 2008-04-19 2008-04-19 Schutzgasgemisch zum Lichtbogen-Schweißen von Aluminium und seinen Legierungen
PCT/EP2009/054059 WO2009127545A1 (fr) 2008-04-19 2009-04-06 Mélange de gaz protecteur pour le soudage à l’arc d’aluminium et d’alliages de celui-ci

Publications (1)

Publication Number Publication Date
EP2279056A1 true EP2279056A1 (fr) 2011-02-02

Family

ID=40887206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09733253A Withdrawn EP2279056A1 (fr) 2008-04-19 2009-04-06 Mélange de gaz protecteur pour le soudage à l arc d aluminium et d alliages de celui-ci

Country Status (3)

Country Link
EP (1) EP2279056A1 (fr)
DE (1) DE102008019859A1 (fr)
WO (1) WO2009127545A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1403947B1 (it) * 2011-02-17 2013-11-08 Rivoira S P A Gas protettivo per la saldatura di alluminio e sue leghe
CN103962754A (zh) * 2013-01-29 2014-08-06 南车青岛四方机车车辆股份有限公司 一种铝合金mig焊接的三元混合保护气体及焊接方法
US11040417B2 (en) 2013-12-16 2021-06-22 Praxair Technology, Inc. Welding gas compositions and method for use

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE403726B (sv) 1976-11-05 1978-09-04 Aga Ab Sett och anordning for att reducera bildningen av ozon vid svetsning eller bearbetning medelst elektrisk ljusbage
DE4028074C1 (fr) 1990-09-05 1992-01-23 Messer Griesheim Gmbh, 6000 Frankfurt, De
DE4106900A1 (de) 1991-03-05 1992-09-10 Messer Griesheim Gmbh Schutzgas zum wig-, mig-, mag- und plasmaschweissen
DE4241982C1 (de) 1992-12-12 1993-11-25 Messer Griesheim Gmbh Schutzgas für das Lichtbogenschweißen von Aluminium
DE4327672A1 (de) * 1993-08-17 1994-12-22 Linde Ag Schutzgas-Lichtbogen-Schweißverfahren sowie zugehöriges Schutzgas
FR2738519B1 (fr) 1995-09-08 1997-10-24 Air Liquide Procede et melange gazeux pour le soudage a l'arc de pieces en aluminium
DE29623194U1 (de) 1996-10-17 1997-12-11 Westfalen Ag Schutzgas zum Lichtbogenschweißen
EP0949038A1 (fr) 1998-04-08 1999-10-13 Linde Aktiengesellschaft Gaz de protection pour le soudage TIG à courant alternatif d'aluminium
DE19831834A1 (de) * 1998-04-08 1999-10-14 Linde Ag Schutzgas zum MIG/MAG-Schweißen von Aluminium
DE19837039A1 (de) 1998-08-14 2000-02-17 Messer Griesheim Gmbh Verfahren zur WIG-Wechselstromschweißung von Aluminium
DE10162937A1 (de) * 2001-12-20 2003-07-03 Linde Ag Verfahren zum Fügen artverschiedener Verbindungen unter Schutzgas
DE10328968A1 (de) 2003-06-26 2005-01-13 Linde Ag Metall-Schutzgas-Fügen mit wechselnder Polarität

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009127545A1 *

Also Published As

Publication number Publication date
DE102008019859A1 (de) 2009-10-29
WO2009127545A1 (fr) 2009-10-22

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