WO1994023883A1 - Method and device for shielding a welding head from the atmosphere - Google Patents

Method and device for shielding a welding head from the atmosphere Download PDF

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Publication number
WO1994023883A1
WO1994023883A1 PCT/FR1994/000441 FR9400441W WO9423883A1 WO 1994023883 A1 WO1994023883 A1 WO 1994023883A1 FR 9400441 W FR9400441 W FR 9400441W WO 9423883 A1 WO9423883 A1 WO 9423883A1
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WO
WIPO (PCT)
Prior art keywords
welding
inert gas
gas
enclosure
vicinity
Prior art date
Application number
PCT/FR1994/000441
Other languages
French (fr)
Inventor
Michel Gareaux
Philippe Marchal
Original Assignee
Itp
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 Itp filed Critical Itp
Priority to AU65726/94A priority Critical patent/AU6572694A/en
Publication of WO1994023883A1 publication Critical patent/WO1994023883A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
    • B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
    • 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
    • B23K15/0066—Seam welding with backing means disposed under the seams
    • 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
    • B23K26/28—Seam welding of curved planar seams
    • B23K26/282—Seam welding of curved planar seams of tube sections
    • 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
    • B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
    • B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma 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
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories
    • B23K9/325—Devices for supplying or evacuating shielding gas
    • B23K9/326—Purge gas rings, i.e. devices for supplying or evacuating shielding gas inside of hollow or tubular articles, e.g. pipes, vessels

Definitions

  • the present invention relates to a method and a device for isolating a welding head from the atmosphere.
  • the present invention is more particularly suitable for welding tube sections to one another, and preferably for welding such tube sections by laser beam.
  • the subject of the present invention is a method for carrying out the welding of metal parts together by ensuring stable and repetitive welding conditions according to which a stream of inert gas is sent into the welding head and a stream of inert gas between the pieces to be weld in the vicinity of the welding point from the side of these parts which is opposite to the welding head, characterized in that the two gas streams are sent so as to obtain in the vicinity of the welding point a speed of substantially zero inert gas.
  • a part of the inert gas in the welding head and the other part of the inert gas inside the tube sections at their junction so that this gas flows outwards along the line of welding between the two tubes before welding is carried out.
  • This embodiment of the method according to the invention is particularly advantageous in the case where the tubes are welded using laser beams, since, in this case, the welding speed is sufficiently high that 'at the start of the operation, the inert gas can be sent over the entire internal periphery of the two sections of tube to be welded, without this resulting in excessive consumption of inert gas.
  • the inert gas flow rates which are supplied on each of the two faces of the parts to be welded to be such that, in the vicinity of the welding point, the pressures of these two gas streams are substantially equal, which has the consequence that the inert gas has a substantially zero flow and speed in the immediate vicinity of the welding point.
  • This characteristic of the invention has the advantage of giving greater stability to the envelope of inert gas which surrounds the welding point, hence a significant improvement in the consistency of the quality of welding.
  • the welding point is not cooled by a constant circulation of inert gas.
  • a specific gas is also sent intended to control the weld pool proper in the vicinity of the welding point, preferably on the side of the welding head.
  • the gas flow rates on either side of the welding point are adjusted so that their pressures are substantially equal.
  • the present invention also relates to a device for implementing the method described above, this device comprising around the welding head, a first enclosure which extends to the vicinity of the parts to be welded and inside which a first stream of inert gas is sent, as well as a second enclosure situated on the opposite face of the parts to be welded and in line with the welding point, enclosure into which an inert gas stream is also sent, characterized in that the first enclosure c ⁇ porte a pipe allowing the routing into this enclosure of an inert gas or a mixture of inert gases, ensuring the general protection of the welding, and another pipe allowing the delivery of a specific gas for controlling the actual welding bath.
  • the inert gas can be sent to either side of the parts to be welded with a pressure of about 5 to
  • the specific gas aims, for example, to control nitriding, the formation of dart or plasma, or even the cooling of the weld.
  • FIG. 1 is a schematic sectional view of an embodiment of the invention.
  • FIG. 2 is a view of Figure 1 in section along II-II.
  • the embodiment shown in the drawing relates to the welding of the ends 1 of two sections of tube 2 and 3 using a laser beam which is brought by an optical path 4 and which, after being reflected on a mirror. 5, is concentrated by a suitable device 6 on the welding point 7.
  • a first enclosure 8 surrounds the device 6 for concentrating the laser beam inside which a gas under pressure is introduced through a pipe 9a to control the weld pool.
  • a second pipe 9b opens out inside the enclosure 8 to convey an inert gas therein which provides general protection for the welding against the penetration of gases from the ambient atmosphere.
  • the gases present in the enclosure 8 escape into the atmosphere through the slight space existing between the bottom wall of the first enclosure 8 and the sections of tube during welding.
  • a second enclosure 10 is placed inside the tube sections 2 and 3 on either side of the line 1 for connecting the tubes.
  • a pipe 11 makes it possible to send into this second enclosure 10 a stream of inert gas which escapes through the interstices existing between the internal wall of the sections of tube 2,3 and the edges of the enclosure 10 which, in the present case has an annular shape, but which could simply relate to the zone which surrounds the welding point 7, provided of course that the second enclosure 10 is moved at the same time as the welding head is moved as and when it is made of the solder.
  • the gas or gases are sent into the lines 9a and 9b and 11 with a pressure such that, taking into account the pressure drops, the gas streams coming from, on the one hand, the first enclosure 8 , and on the other hand of the second enclosure 10, have a pressure equal to the vicinity of the welding point 7, which has the consequence that in the vicinity of this welding point, the gases have a zero or substantially zero speed.
  • the gases can be sent to each of the chambers 8 and 10 with a pressure of the order of 5 to

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

Abstract

A method for welding metal parts together under stable and reproducible welding conditions, wherein inert gas flows are passed through a welding head and between the parts to be welded, in the region of the welding point and from the side of the parts opposite said welding head, in such a way that the inert gas flow speed in the region of said welding point (7) is substantially zero.

Description

Procédé et dispositif pour isoler de JJatmosphère une tête de soudage. Method and device for isolating a welding head from the atmosphere.
La présente invention a pour objet un procédé et un dispositif pour isoler de l'atmosphère une tête de soudage.The present invention relates to a method and a device for isolating a welding head from the atmosphere.
On sait que, dans les procédés de soudage par échauffement de métal, il est nécessaire de protéger de l'atmosphère ambiante les parties du métal qui sont portées à haute température, de manière à éviter leur oxydation. II est connu pour cela d'envoyer autour de la tête de soudage un gaz inerte tel que de l'argon ou un mélange de gaz, par exemple d'argon, d'héliu et/ou d'hydrogène.It is known that, in the processes of welding by heating of metal, it is necessary to protect from the ambient atmosphere the parts of the metal which are brought to high temperature, so as to avoid their oxidation. It is known for this to send around the welding head an inert gas such as argon or a mixture of gases, for example argon, heliu and / or hydrogen.
On crée de cette manière un courant gazeux qui s'écoule autour du point de soudage et qui lui évite d'être au contact avec 1'atmosphère.In this way a gas current is created which flows around the welding point and which prevents it from being in contact with the atmosphere.
Cette manière de faire présente l'inconvénient que les courants de gaz inerte qui sont ainsi créés ne sont pas parfaitement stables, de telle sorte que par moment, ils sont perturbés par les mouvements de l'atmosphère qui viennent ainsi au contact du point de soudage et perturbent la qualité de la soudure.This procedure has the disadvantage that the inert gas streams which are thus created are not perfectly stable, so that at times they are disturbed by the movements of the atmosphere which thus come into contact with the welding point. and disturb the quality of the weld.
De surcroît, le débit de gaz non négligeable gui est ainsi envoyé sur le point de soudage donne lieu à des conditions de refroidissement instables.In addition, the non-negligible gas flow rate which is thus sent to the welding point gives rise to unstable cooling conditions.
La présente invention est plus particulièrement adaptée au soudage de tronçons de tube les uns aux autres, et de préférence au soudage de tels tronçons de tube par rayon laser.The present invention is more particularly suitable for welding tube sections to one another, and preferably for welding such tube sections by laser beam.
La présente invention a pour objet un procédé pour réaliser le soudage de pièces métalliques entre elles en assurant des conditions de soudage stables et répétitives selon lequel on envoie un courant de gaz inerte dans la tête de soudage et un courant de gaz inerte entre les pièces à souder au voisinage du point de soudage à partir du côté de ces pièces qui est opposé à la tête de soudage, caractérisé par le fait que l'on envoie les deux courants de gaz de manière à obtenir au voisinage du point de soudage une vitesse du gaz inerte sensiblement nulle.The subject of the present invention is a method for carrying out the welding of metal parts together by ensuring stable and repetitive welding conditions according to which a stream of inert gas is sent into the welding head and a stream of inert gas between the pieces to be weld in the vicinity of the welding point from the side of these parts which is opposite to the welding head, characterized in that the two gas streams are sent so as to obtain in the vicinity of the welding point a speed of substantially zero inert gas.
Dans un mode de mise en oeuvre du procédé selon l'invention qui s'applique au soudage de deux tronçons de tube, on envoie d'une part du gaz inerte dans la tête de soudage et d'autre part du gaz inerte à l'intérieur des tronçons de tube au niveau de leur jonction de manière à ce que ce gaz s'écoule vers l'extérieur tout le long de la ligne de soudure entre les deux tubes avant que le soudage ne soit réalisé.In one embodiment of the method according to the invention which applies to the welding of two sections of tube, a part of the inert gas in the welding head and the other part of the inert gas inside the tube sections at their junction so that this gas flows outwards along the line of welding between the two tubes before welding is carried out.
Ce mode de mise en oeuvre du procédé selon l'invention est particulièrement avantageux dans le cas où l'on réalise le soudage des tubes à l'aide de rayons laser, car, dans ce cas, la vitesse de soudage est suffisanment grande pour qu'en début d'opération on puisse envoyer le gaz inerte sur toute la périphérie interne des deux tronçons de tube à souder, sans qu'il en résulte une trop grande consommation de gaz inerte.This embodiment of the method according to the invention is particularly advantageous in the case where the tubes are welded using laser beams, since, in this case, the welding speed is sufficiently high that 'at the start of the operation, the inert gas can be sent over the entire internal periphery of the two sections of tube to be welded, without this resulting in excessive consumption of inert gas.
Conformément à l'invention, il est avantageux que les débits de gaz inerte qui sont amenés sur chacune des deux faces des pièces à souder soient tels, qu'au voisinage du point de soudage, les pressions de ces deux courants gazeux soient sensiblement égales, ce qui a pour conséquence que le gaz inerte a un débit et une vitesse sensiblement nuls dans l'entourage immédiat du point de soudage.In accordance with the invention, it is advantageous for the inert gas flow rates which are supplied on each of the two faces of the parts to be welded to be such that, in the vicinity of the welding point, the pressures of these two gas streams are substantially equal, which has the consequence that the inert gas has a substantially zero flow and speed in the immediate vicinity of the welding point.
Cette caractéristique de l'invention présente l'avantage de conférer une plus grande stabilité de l'enveloppe de gaz inerte qui entoure le point de soudage d'où une amélioration significative de la constance de la qualité de soudure. De surcroît, le point de soudage ne se trouve pas refroidi par une circulation constante de gaz inerte.This characteristic of the invention has the advantage of giving greater stability to the envelope of inert gas which surrounds the welding point, hence a significant improvement in the consistency of the quality of welding. In addition, the welding point is not cooled by a constant circulation of inert gas.
Selon un mode de mise en oeuvre préféré du procédé de l'invention, on envoie également un gaz spécifique destiné à contrôler le bain de soudure proprement dit au voisinage du point de soudage, de préférence du côté de la tête de soudage.According to a preferred embodiment of the method of the invention, a specific gas is also sent intended to control the weld pool proper in the vicinity of the welding point, preferably on the side of the welding head.
Bien entendu, selon l'invention, on règle les débits de gaz de part et d'autre du point de soudage de sorte que leurs pressions soient sensiblement égales.Of course, according to the invention, the gas flow rates on either side of the welding point are adjusted so that their pressures are substantially equal.
Ainsi, grâce à l'isolement créé par le gaz inerte autour du point de soudage et grâce à la présence du gaz de contrôle du bain de soudure, on obtient une bonne maîtrise et une parfaite répétitivité des conditions de soudage. La présente invention a également pour objet un dispositif pour mettre en oeuvre le procédé ci-dessus décrit, ce dispositif comportant autour de la tête de soudage, une première enceinte qui s'étend jusqu'au voisinage des pièces à souder et à l'intérieur de laquelle on envoie un premier courant de gaz inerte, ainsi qu'une seconde enceinte située sur la face opposée des pièces à souder et au droit du point de soudage, enceinte dans laquelle on envoie également un courant de gaz inerte, caractérisé par le fait que la première enceinte cαπporte une canalisation permettant l'acheminement dans cette enceinte d'un gaz inerte ou d'un mélange de gaz inertes, assurant la protection générale de la soudure, et une autre canalisation permettant l'acheminement d'un gaz spécifique de contrôle du bain de soudure proprement dit.Thus, thanks to the isolation created by the inert gas around the welding point and thanks to the presence of the control gas in the weld pool, good control and perfect repeatability of the welding conditions are obtained. The present invention also relates to a device for implementing the method described above, this device comprising around the welding head, a first enclosure which extends to the vicinity of the parts to be welded and inside which a first stream of inert gas is sent, as well as a second enclosure situated on the opposite face of the parts to be welded and in line with the welding point, enclosure into which an inert gas stream is also sent, characterized in that the first enclosure cαπporte a pipe allowing the routing into this enclosure of an inert gas or a mixture of inert gases, ensuring the general protection of the welding, and another pipe allowing the delivery of a specific gas for controlling the actual welding bath.
A titre d'exemple, le gaz inerte peut être envoyé de part et d'autre des pièces à souder avec une pression d'environ 5 àFor example, the inert gas can be sent to either side of the parts to be welded with a pressure of about 5 to
2 30 grammes par cm .2 30 grams per cm.
Le gaz spécifique vise par exemple à contrôler la nitruration, la formation du dard ou du plasma, ou encore le refroidissement de la soudure.The specific gas aims, for example, to control nitriding, the formation of dart or plasma, or even the cooling of the weld.
Dans le but de mieux faire comprendre l'invention on va en décrire maintenant à titre d'illustration et sans aucun caractère limitatif un mode de réalisation pris comme exemple représenté sur le dessin annexé dans lequel :In order to better understand the invention, we will now describe it by way of illustration and without any limiting character, an embodiment taken as an example represented in the appended drawing in which:
- la figure 1 est une vue schématique en coupe d'un mode de réalisation de l'invention, etFIG. 1 is a schematic sectional view of an embodiment of the invention, and
- la figure 2 est une vue de la figure 1 en coupe selon II-II. Le mode de réalisation représenté sur le dessin concerne le soudage des extrémités 1 de deux tronçons de tube 2 et 3 à l'aide d'un rayon laser qui est amené par un chemin optique 4 et qui, après s'être réfléchi sur un mirOir 5, est concentré par un dispositif approprié 6 sur le point de soudage 7. Conformément à l'invention, une première enceinte 8 entoure le dispositif 6 de concentration du rayon laser à l'intérieur duquel un gaz sous pression est introduit par une canalisation 9a pour contrôler le bain de soudure.- Figure 2 is a view of Figure 1 in section along II-II. The embodiment shown in the drawing relates to the welding of the ends 1 of two sections of tube 2 and 3 using a laser beam which is brought by an optical path 4 and which, after being reflected on a mirror. 5, is concentrated by a suitable device 6 on the welding point 7. According to the invention, a first enclosure 8 surrounds the device 6 for concentrating the laser beam inside which a gas under pressure is introduced through a pipe 9a to control the weld pool.
De plus, conformément à l'invention, une seconde canalisation 9b débouche à l'intérieur de l'enceinte 8 pour y acheminer un gaz inerte qui assure la protection générale de la soudure contre la pénétration de gaz provenant de l'atmosphère ambiante.In addition, in accordance with the invention, a second pipe 9b opens out inside the enclosure 8 to convey an inert gas therein which provides general protection for the welding against the penetration of gases from the ambient atmosphere.
Les gaz présents dans l'enceinte 8 s'échappent dans l'atmosphère en passant par le léger espace existant entre la paroi inférieure de la première enceinte 8 et les tronçons de tube en cours de soudage.The gases present in the enclosure 8 escape into the atmosphere through the slight space existing between the bottom wall of the first enclosure 8 and the sections of tube during welding.
Conformément à l'invention, l'on place une seconde enceinte 10, schématiquement représentée, à l'intérieur des tronçons de tube 2 et 3 de part et d'autre de la ligne 1 de raccordement des tubes.According to the invention, a second enclosure 10, diagrammatically shown, is placed inside the tube sections 2 and 3 on either side of the line 1 for connecting the tubes.
Une canalisation 11 permet d'envoyer dans cette seconde enceinte 10 un courant de gaz inerte qui s'échappe par les interstices existants entre la paroi interne des tronçons de tube 2,3 et les bords de l'enceinte 10 qui, dans le cas présent a une forme annulaire, mais qui pourrait simplement concerner la zone qui entoure le point de soudage 7, à condition bien entendu de déplacer la seconde enceinte 10 en même temps que l'on déplace la tête de soudage au fur et à mesure de la réalisation de la soudure.A pipe 11 makes it possible to send into this second enclosure 10 a stream of inert gas which escapes through the interstices existing between the internal wall of the sections of tube 2,3 and the edges of the enclosure 10 which, in the present case has an annular shape, but which could simply relate to the zone which surrounds the welding point 7, provided of course that the second enclosure 10 is moved at the same time as the welding head is moved as and when it is made of the solder.
Conformément à l'invention, l'on envoie le ou les gaz dans les canalisations 9a et 9b et 11 avec une pression telle que, compte tenu des pertes de charge, les courants de gaz provenant, d'une part de la première enceinte 8, et d'autre part de la seconde enceinte 10, aient une pression égale au voisinage du point de soudage 7, ce qui a pour conséquence qu'au voisinage de ce point de soudage, les gaz ont une vitesse nulle ou sensiblement nulle.In accordance with the invention, the gas or gases are sent into the lines 9a and 9b and 11 with a pressure such that, taking into account the pressure drops, the gas streams coming from, on the one hand, the first enclosure 8 , and on the other hand of the second enclosure 10, have a pressure equal to the vicinity of the welding point 7, which has the consequence that in the vicinity of this welding point, the gases have a zero or substantially zero speed.
A titre d'exemple, les gaz peuvent être envoyés dans chacune des enceintes 8 et 10 avec une pression de l'ordre de 5 àFor example, the gases can be sent to each of the chambers 8 and 10 with a pressure of the order of 5 to
2 30 grammes par cm , cette pression étant bien entendu une surpression par rapport à la pression atmosphérique. On comprend dans ces conditions que l'on obtient autour du point de soudage une gaine de gaz dont la composition est bien contrôlée et parfaitement stable, et qui, ces gaz ayant une vitesse nulle, ne refroidit pas le point de soudage.2 30 grams per cm, this pressure being of course an overpressure relative to atmospheric pressure. It is understood under these conditions that one obtains around the welding point a gas sheath whose composition is well controlled and perfectly stable, and which, these gases having a zero speed, does not cool the welding point.
Il est bien entendu que le mode de réalisation qui a été décrit ci-dessus ne présente aucun caractère limitatif et qu'il pourra recevoir toutes modifications désirables sans sortir pour cela du cadre de l'invention. En particulier, il est clair que l'invention n'est pas limitée au dispositif permettant le soudage des extrémités de tube à l'aide de rayons laser. It is understood that the embodiment which has been described above has no limiting character and that it may receive any desirable modifications without departing from the scope of the invention. In particular, it is clear that the invention is not limited to the device allowing the welding of the tube ends using laser rays.

Claims

REVENDICATIONS
1. Procédé pour réaliser le soudage de pièces métalliques entre elles en assurant des conditions de soudage stables et répétitives, selon lequel on envoie un courant de gaz inerte dans la tête de soudage, et un courant de gaz inerte entre les pièces à souder au voisinage du point de soudage à partir du côté de ces pièces qui est opposé à la tête de soudage, caractérisé par le fait que l'on envoie les deux colorants de gaz de manière à obtenir au voisinage du point de soudage (7) une vitesse de gaz inerte sensiblement nulle.1. A method for welding metal parts together ensuring stable and repetitive welding conditions, according to which a stream of inert gas is sent into the welding head, and a stream of inert gas between the pieces to be welded in the vicinity of the welding point from the side of these parts which is opposite to the welding head, characterized in that the two gas dyes are sent so as to obtain in the vicinity of the welding point (7) a speed of substantially zero inert gas.
2. Procédé selon la revendication 1, caractérisé par le fait que l'on réalise le soudage de deux tronçons de tube (2,3) en envoyant, d'une part du gaz inerte dans la tête de soudage (6), et d'autre part du gaz inerte à l'intérieur des tronçons de tube (2,3) au niveau de leur jonction (1) de manière à ce que ce gaz s'écoule vers l'extérieur le long de la ligne de soudure (1) entre les deux tubes (2,3) avant que le soudage ne soit réalisé.2. Method according to claim 1, characterized in that the welding of two sections of tube (2,3) is carried out by sending, on the one hand, inert gas into the welding head (6), and d on the other hand, inert gas inside the tube sections (2,3) at their junction (1) so that this gas flows outwards along the weld line (1 ) between the two tubes (2,3) before welding is carried out.
3. Procédé selon l'une quelconque des revendications3. Method according to any one of the claims
1 et 2, caractérisé par le fait que le soudage s'effectue à l'aide d'un rayon laser.1 and 2, characterized in that the welding is carried out using a laser beam.
4. Procédé selon l'une quelconque des revendications4. Method according to any one of the claims
1 à 3, caractérisé par le fait que les débits de gaz inerte qui sont amenés sur chacune des deux faces des pièces à souder sont tels qu'au voisinage du point de soudage (7) les pressions de ces deux courants gazeux soient sensiblement égales de manière à ce que le gaz inerte ait une vitesse sensiblement nulle dans l'entourage immédiat du point de soudage.1 to 3, characterized in that the inert gas flow rates which are supplied on each of the two faces of the parts to be welded are such that in the vicinity of the welding point (7) the pressures of these two gas streams are substantially equal to so that the inert gas has a substantially zero speed in the immediate vicinity of the welding point.
5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'on envoie également un gaz spécifique destiné à contrôler le bain de soudure proprement dit au voisinage du point de soudage (7) tout en respectant l'équilibre de pression des gaz dans l'entourage i-πmédiat du point de soudage (7).5. Method according to any one of claims 1 to 4, characterized in that one also sends a specific gas intended to control the actual weld pool in the vicinity of the welding point (7) while respecting the gas pressure balance in the immediate environment of the welding point (7).
6. Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 5, comportant autour de la tête de soudage, une première enceinte (8) qui s'étend jusqu'au voisinage des pièces à souder (2,3), et à l'intérieur de laquelle on envoie un premier courant de gaz inerte, ainsi qu'une seconde enceinte (10) située sur la face opposée des pièces à souder (2,3) au droit du point de soudage (7), enceinte dans laquelle on envoie également un courant de gaz inerte, caractérisé par le fait que la première enceinte (8) comporte une canalisation (9b) permettant l'acheminement dans cette enceinte (8) d'un gaz inerte ou d'un mélange de gaz inertes, assurant la protection générale de la soudure, et une autre canalisation (9a) permettant l'acheminement d'un gaz spécifique de contrôle du bain de soudure proprement dit. 6. Device for implementing the method according to any one of claims 1 to 5, comprising around the welding head, a first enclosure (8) which extends to the vicinity of the parts to be welded (2, 3), and inside which a first stream of inert gas is sent, as well as a second enclosure (10) located on the opposite face of the parts to be welded (2,3) in line with the welding point (7), enclosure in which a stream of inert gas is also sent, characterized in that the first enclosure (8 ) comprises a pipe (9b) allowing the routing in this enclosure (8) of an inert gas or a mixture of inert gases, ensuring the general protection of the weld, and another pipe (9a) allowing the routing a specific gas for controlling the actual weld pool.
PCT/FR1994/000441 1993-04-20 1994-04-20 Method and device for shielding a welding head from the atmosphere WO1994023883A1 (en)

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AU65726/94A AU6572694A (en) 1993-04-20 1994-04-20 Method and device for shielding a welding head from the atmosphere

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9304640A FR2704167B1 (en) 1993-04-20 1993-04-20 Method and device for isolating a welding head from the atmosphere.
FR93/04640 1993-04-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015526298A (en) * 2012-08-31 2015-09-10 ポスコ Laser welding method and laser welding member using the same

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JP4277429B2 (en) * 2000-07-27 2009-06-10 株式会社デンソー High-density energy beam processing method and apparatus
FR2870765A1 (en) * 2004-05-26 2005-12-02 Air Liquide Carbon dioxide type laser welding process for welding together one or more metal items
US11097367B2 (en) * 2015-05-21 2021-08-24 Illinois Tool Works Inc. System and method for reducing weld root concavity
CN113618285B (en) * 2021-10-12 2021-12-28 艾美特焊接自动化技术(北京)有限公司 Lifting type longitudinal seam welding equipment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3300382A1 (en) * 1983-01-07 1984-07-12 Josef 4250 Bottrop Adam DEVICE FOR GAS FLOWING FROM TWO TO BE WELDED, IN PARTICULAR SMALL-CALIBRATED TUBES
DE3544280A1 (en) * 1985-12-14 1987-06-19 Mtu Muenchen Gmbh Process and device for controlling an inert gas (protective gas) and/or flushing (scavenging) gas stream to a welding torch and a seam root protection device
DE3725079A1 (en) * 1986-08-21 1988-03-03 Meyer Fa Rud Otto Method of influencing the emission of primary particles, in particular in the welding of pipes made of chromium-nickel steel or the like, and device for carrying out the method
WO1990006205A1 (en) * 1988-11-30 1990-06-14 Tjæreborg Industri A/S Method and tool for the welding of pipes
EP0438940A2 (en) * 1989-12-28 1991-07-31 Framatome Process and laser head for working in a tube
US5187343A (en) * 1991-10-30 1993-02-16 Edwards Thomas W Purge block for pipe welding

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3300382A1 (en) * 1983-01-07 1984-07-12 Josef 4250 Bottrop Adam DEVICE FOR GAS FLOWING FROM TWO TO BE WELDED, IN PARTICULAR SMALL-CALIBRATED TUBES
DE3544280A1 (en) * 1985-12-14 1987-06-19 Mtu Muenchen Gmbh Process and device for controlling an inert gas (protective gas) and/or flushing (scavenging) gas stream to a welding torch and a seam root protection device
DE3725079A1 (en) * 1986-08-21 1988-03-03 Meyer Fa Rud Otto Method of influencing the emission of primary particles, in particular in the welding of pipes made of chromium-nickel steel or the like, and device for carrying out the method
WO1990006205A1 (en) * 1988-11-30 1990-06-14 Tjæreborg Industri A/S Method and tool for the welding of pipes
EP0438940A2 (en) * 1989-12-28 1991-07-31 Framatome Process and laser head for working in a tube
US5187343A (en) * 1991-10-30 1993-02-16 Edwards Thomas W Purge block for pipe welding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015526298A (en) * 2012-08-31 2015-09-10 ポスコ Laser welding method and laser welding member using the same

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AU6572694A (en) 1994-11-08
FR2704167A1 (en) 1994-10-28
FR2704167B1 (en) 1995-06-16

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