FR2499892A1 - Cleansing flux for brazing purposes using acrylic! resin binder - for low m.pt. system without binder residues - Google Patents

Cleansing flux for brazing purposes using acrylic! resin binder - for low m.pt. system without binder residues Download PDF

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Publication number
FR2499892A1
FR2499892A1 FR8102975A FR8102975A FR2499892A1 FR 2499892 A1 FR2499892 A1 FR 2499892A1 FR 8102975 A FR8102975 A FR 8102975A FR 8102975 A FR8102975 A FR 8102975A FR 2499892 A1 FR2499892 A1 FR 2499892A1
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France
Prior art keywords
stick
flux
brazing
stripper
filler wire
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Granted
Application number
FR8102975A
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French (fr)
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FR2499892B1 (en
Inventor
Michel Dauvergne
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Lincoln Electric Co France SA
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La Soudure Autogene Francaise
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Priority to FR8102975A priority Critical patent/FR2499892A1/en
Publication of FR2499892A1 publication Critical patent/FR2499892A1/en
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Publication of FR2499892B1 publication Critical patent/FR2499892B1/fr
Granted legal-status Critical Current

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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
    • 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
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3606—Borates or B-oxides
    • 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
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0244—Powders, particles or spheres; Preforms made therefrom

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A cleansing flux for use when brazing comprises a rod of reagent material (boric acid and salts) bonded by a volatile material of m. pt. 45-120 deg.C, specifically where the binder comprises 7.3-12.5, pref. 8-10% of the mixt. and is an acrylic resin. Esp. for use as 'silver solder' for brazing, to ensure the correct proportions of reagents are present to remove superficial oxides without interfering with the brazed interface. Easier to use than cleaning flux in powdered form without contaminating adjacent equipment. Applicable at temps. of 100-150 deg.C. The binder resin fuses and volatilises to leave no residue.

Description

La présente invention concerne un bâtonnet décapant pour brasage avec fil d'apport. The present invention relates to a stripper stick for soldering with filler wire.

La technique d'assemblage par brasage fait appel le plus souvent a des flux décapants destinés a dissoudre les oxydes présents a la surface des pièces a assembler, pour permettre une bonne réalisation du joint a braser. The brazing assembly technique most often uses flux fluxes intended to dissolve the oxides present on the surface of the parts to be assembled, to allow a good realization of the solder joint.

Ces flux se présentent, pour les opérations de brasage manuel, sous forme de poudres ou de pâtes. L'enduction du joint a braser se fait soit par saupoudrage, soit par badigeonnage, ou encore en apportant la poudre au moyen du fil d'apport chauffé. These flows are, for manual brazing operations, in the form of powders or pastes. The coating of the solder joint is done either by dusting, or by brushing, or by bringing the powder by means of the heated filler wire.

On constate que ces procédés montrent des désavantages certains, d'une part ils ne sont pas d'une mise en oeuvre pratique et rapide et ils conduisent a un gaspillage de produits décapants. D'autre part, la conservation des poudre: et pates n'est pas parfaite même en récipients hermétiques. It can be seen that these methods show certain disadvantages, on the one hand they are not practical and rapid to use and they lead to a waste of pickling products. On the other hand, the storage of powder: and pasta is not perfect even in airtight containers.

L'emploi de métal d'apport enrobé de flux résoud de manière satisfaisante le problème de la conservation du flux. L'application est également facilitée, mais on peut reprocher a cette technique l'apport simultané du flux et du métal liquide, avec pour inconvénients, un manque de protection de la pièce durant le chauffage et un temps d'action du flux très faible. De plus, le rapport flux-métal d'apport, reste constant et ajusté a un travail dit "moyen" ainsi, dans certains cas le flux peut être en quantité insuffisante, par exemple pour effectuer des brasures sur des pièces oxydées, et par contre, il peut être surabondant dans d'autre cas comme en soudobrasage. The use of flux-coated filler metal satisfactorily solves the problem of preserving the flux. The application is also facilitated, but this technique can be criticized for the simultaneous supply of the flux and of the molten metal, with the disadvantages, a lack of protection of the part during heating and a very short action time of the flux. In addition, the flux-filler metal ratio remains constant and adjusted to a so-called "average" work, so in some cases the flux may be in insufficient quantity, for example for brazing on oxidized parts, and on the other hand , it can be overabundant in other cases such as brazing.

On a cherché a remédier a ces inconvénients, en proposant un bâtonnet décapant pour brasage avec fil d'apport. We sought to remedy these drawbacks by proposing a stripping stick for soldering with filler wire.

Cette nouvelle présentation du flux se traduit par de nombreux avantages. Elle permet une conservation illimitée du flux, sans assujettissement a des récipients de stockage, la manipulation est aisée. D'autre part, elle donne la possibilité de doser l'apport de flux en fonction des pièces å assembler. De plus, l'emploi de ces bâtonnets conduit a une bonne protection, dûe au dépot du flux avant le fort chauffage des pièces a assembler.  This new presentation of the flow has many advantages. It allows unlimited conservation of the flow, without subjecting to storage containers, handling is easy. On the other hand, it gives the possibility of dosing the flow contribution according to the parts to be assembled. In addition, the use of these rods leads to good protection, due to the deposition of the flux before the strong heating of the parts to be assembled.

Selon l'invention, le batonnet décapant est constitué par un flux décapant aggloméré sous forme de b tonnet, comportant au moins un élément fusible a température comprise entre 45 et 1200 C. According to the invention, the stripper stick consists of a flux flux agglomerated in the form of a cap, comprising at least one fusible element at a temperature between 45 and 1200 C.

Le flux décapant aggloméré sous forme de bâtonnet contient au moins du tétraborate de sodium décahydraté, de l'acide borique et éventuellement haloboriqué sous forme libre ou de sel alcalin et un liant du type résine acrylique. The stripped flux agglomerated in the form of a stick contains at least sodium tetraborate decahydrate, boric acid and optionally haloboricated in free form or of alkaline salt and a binder of the acrylic resin type.

La résine acrylique est avantageusement présente a l'état sec dans le flux aggloméré en quantité comprise entre 7,5 z 12,5 X par rapport a la quantité totale des autres constituants ramenée a loo, et préférentiellement entre 8 et 10 ,
Dans cette composition de flux a base de borax et d'acide borique, le borax décahydraté Na2B4fl7, 10 H20 est utilisé en raison de sa propriété de fondre dans son eau de cristallisation a la température de 620 C.The acrylic resin is advantageously present in the dry state in the agglomerated stream in an amount between 7.5 and 12.5 X relative to the total amount of the other constituents reduced to 100, and preferably between 8 and 10,
In this flux composition based on borax and boric acid, the borax decahydrate Na2B4fl7, 10 H20 is used because of its property of melting in its water of crystallization at the temperature of 620 C.

La résine acrylique est employée comme liant pour sa parfaite ctEntibilité avec l'opération, car elle ne laisse aucun résidu solide au cours de sa décomposition par la chaleur. De plus, cette résine acrylique possède un point de ramolissement d'environ 1200 C, ce qui est également avantageux dans le cadre de l'invention. Acrylic resin is used as a binder for its perfect compatibility with the operation, because it leaves no solid residue during its decomposition by heat. In addition, this acrylic resin has a softening point of approximately 1200 ° C., which is also advantageous in the context of the invention.

La fabrication des bâtonnets décapants selon l'invention consiste en un mélange des constituants solides en poudre, tels le borax, l'acide borique et éventuellement un haloborate, puis en l'addition de la résine acrylique, sous forme de solution dans un solvant, ou préférentiellement d'une dispersion aqueuse h haute viscosité, en vue de l'obtention d'une pâte élaborée par les moyens de malaxage connus. Puis, cette pâte est ensuite filée, la presse hydraulique, sous une pression de 100 å 200 bars, en vue de former des bâtonnets cylindriques de diamètre compris entre 5 et 12 millimètres, et de longueur comprise entre lo et 40 centimètres. Après filage les bâtonnets sont séchés a l'air, a température ambiante jusqu' durcissement complet. The manufacture of the pickling sticks according to the invention consists of a mixture of the solid powder components, such as borax, boric acid and optionally a haloborate, then in the addition of the acrylic resin, in the form of a solution in a solvent, or preferably an aqueous dispersion at high viscosity, with a view to obtaining a paste produced by known kneading means. Then, this dough is then spun, the hydraulic press, under a pressure of 100 to 200 bars, in order to form cylindrical rods of diameter between 5 and 12 millimeters, and of length between lo and 40 centimeters. After spinning the sticks are air dried, at room temperature until completely hardened.

Les bâtonnets décapants selon l'invention d'une manipulation aisée permettent une mise en oeuvre très simple d'un procédé de brasage qui conduit k des résultats satisfai sants tant du point de vue du dosage de l'apport du flux que de la protection. Selon ce procédé, on procède a différentes opérations selon lesquelles on préchauffe le joint entre les éléments a assembler, a température modérée comprise entre 100 et 1500 C, a l'aide du chalumeau utilisé pour le brasage Puis on met en contact le bâtonnet décapant fusible avec une des extrémités du joint, et l'on déplace le bâtonnet le long du joint et ensuite l'on procède au brasage avec un fil d'apport nu. The stripping sticks according to the invention of easy handling allow a very simple implementation of a brazing process which leads to satisfactory results both from the point of view of the dosage of the contribution of flux and protection. According to this process, various operations are carried out according to which the joint between the elements to be assembled is preheated, at a moderate temperature of between 100 and 1500 ° C., using the torch used for soldering. Then the fusible stripper stick is brought into contact. with one of the ends of the joint, and the rod is moved along the joint and then the brazing is carried out with a bare filler wire.

Les bâtonnets décapants selon l'invention sont adaptés a tout type de brasage avec fil d'apport métallique. The stripper sticks according to the invention are suitable for any type of brazing with metallic filler wire.

On obtient d'excellents résultats tant avec fil d'apport laiton qu'en brasure argent, en adaptant la nature des constituants qui complètent la composition du bâtonnet décapant a base de borax décahydraté et de liant du type résine acrylique.Excellent results are obtained both with brass filler wire and with silver solder, by adapting the nature of the constituents which complete the composition of the pickling stick based on borax decahydrate and binder of the acrylic resin type.

Il est donné ci-après des exemples qui illustrent l'invention a titre non limitatif
Exemple 1
Bâtonnet décapant pour brasage avec fil d'apport laiton.Examples are given below which illustrate the invention without limitation
Example 1
Stripping stick for soldering with brass filler wire.

On mélange les poudres de borax décahydraté et d'acide borique dans les proportions suivantes
Borax décahydraté 235 8
Acide borique 765 8s puis on ajoute 180g d'une dispersion aqueuse acrylique pure de haute viscosité, 10.060 a 4000 mPas. (millipascalseconde), contenant 49 a 51 % d'extrait sec, le diamètre des particules étant de 0,1 a 0,2 km, vendu sous la marque commerciale "Plextol D 498, par la société Röhm. On malaxe la pâte obtenue puis on la file a la pression hydraulique sous une pression de 120 kg en bâtonnets cylindriques de 8 mi de diamètre et 4e om de longueur. On laise scher a l'air a la température ambiante.The powders of borax decahydrate and boric acid are mixed in the following proportions
Borax decahydrate 235 8
Boric acid 765 8s then 180g of a pure acrylic viscous dispersion of high viscosity, 10,060 to 4,000 mPas are added. (millipascalsecond), containing 49 to 51% of dry extract, the diameter of the particles being 0.1 to 0.2 km, sold under the trademark "Plextol D 498, by the company Röhm. The paste obtained is kneaded then it is spun under hydraulic pressure at a pressure of 120 kg in cylindrical sticks 8 mi in diameter and 4th om in length and left to air dry at room temperature.

Exemple 2
Bâtonnet décapant pour brasure argent. Example 2
Stripper stick for silver solder.

Dans les mêmes conditions que précédemment on prépare des bâtonnets aptes au décapage de pièces destinées å être brasées a l'aide d'un métal d'apport x base d'argent, a partir d'une pâte de composition suivante
Borax décahydraté 500
Tétraborate de potassium 100
Fluoroborate de potassium 400
Dispersion aqueuse Plexol D 498" 180 Under the same conditions as above, sticks suitable for pickling parts intended to be brazed using a filler metal x silver base are prepared from a paste of the following composition
Borax decahydrate 500
Potassium tetraborate 100
Potassium fluoroborate 400
Aqueous dispersion Plexol D 498 "180

Claims (5)

REVENDICATIONS 1. Bâtonnet décapant pour brasage avec fil d'apport, caractérisé en ce que le dit bâtonnet est constitué par un flux décapant aggloméré sous forme de bâtonnet, comportant au moins un élément fusible a une température comprise entre 45 et 120 C. 1. Stripper stick for soldering with filler wire, characterized in that said stick consists of a flux flux agglomerated in the form of stick, comprising at least one fusible element at a temperature between 45 and 120 C. 2. Bâtonnet décapant pour brasage avec fil d'apport selon la revendication 1, caractérisé en ce que le flux décapant aggloméré sous forme de bâtonnet contient au moins du tetraborate de sodium décahydraté, de l'acide borique et éventuellement haloborique sous forme libre ou de sel alcalin et un liant du type résine acrylique. 2. Stripper stick for soldering with filler wire according to claim 1, characterized in that the agglomerated flux stripper in the form of stick contains at least sodium tetraborate decahydrate, boric acid and optionally haloboric in free form or of alkaline salt and a binder of the acrylic resin type. 3. Bâtonnet décapant pour brasage avec fil d'apport selon la revendication 1 ou 2, caractérisé en ce que le flux décapant aggloméré contient entre 7,5 a 12,5 % de résine acrylique, de préférence entre 8 et 10 % par rapport a la quantité totale des autres constituants ramenée a 100. 3. Stripping stick for soldering with filler wire according to claim 1 or 2, characterized in that the agglomerated stripping flux contains between 7.5 to 12.5% of acrylic resin, preferably between 8 and 10% relative to the total amount of the other constituents reduced to 100. 4. Procédé de préparation de bâtonnet pour brasage selon une quelconque des revendicatiorsl a 4, caractérisé en ce que l'on élabore par malaxage une pâte constituée des composants solides en poudre du flux et d'une dispersion aqueuse a haute viscosité de résine acrylique, puis file la dite pâte, sous une pression de 100 a 200 bars, en vue de former des bâtonnets cylindriques séchés a l'air jusqu'a durcissement complet. 4. Method for preparing a stick for brazing according to any one of the claims 4, characterized in that a paste is produced by kneading consisting of the solid powder components of the flux and of an aqueous dispersion with high viscosity of acrylic resin, then spins said paste, under a pressure of 100 to 200 bars, in order to form cylindrical rods air-dried until completely hardened. 5. Procédé de brasage mettant en oeuvre le bâtonnet décapant selon une des revendications 1 a 3, caractérisé par les opérations suivantes selon lesquelles on préchauffe le joint entre les éléments a assembler, a température modérée comprise entre 100 et 150e C, a l'aide du chalumeau utilise pour le brasage, puis on met en contact le bâtonnet décapant fusible avec une des extrémités du joint, et on déplace le bâtonnet le long du joint, et ensuite procède au brasage avec un fil d'apport nu.  5. Brazing method using the stripper stick according to one of claims 1 to 3, characterized by the following operations in which the joint between the elements to be assembled is preheated, at a moderate temperature of between 100 and 150 ° C., using of the blowtorch used for brazing, then the fusible stripping stick is brought into contact with one of the ends of the joint, and the stick is moved along the joint, and then brazing is carried out with a bare filler wire.
FR8102975A 1981-02-16 1981-02-16 Cleansing flux for brazing purposes using acrylic! resin binder - for low m.pt. system without binder residues Granted FR2499892A1 (en)

Priority Applications (1)

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FR8102975A FR2499892A1 (en) 1981-02-16 1981-02-16 Cleansing flux for brazing purposes using acrylic! resin binder - for low m.pt. system without binder residues

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FR8102975A FR2499892A1 (en) 1981-02-16 1981-02-16 Cleansing flux for brazing purposes using acrylic! resin binder - for low m.pt. system without binder residues

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FR2499892A1 true FR2499892A1 (en) 1982-08-20
FR2499892B1 FR2499892B1 (en) 1984-11-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220212295A1 (en) * 2019-05-29 2022-07-07 Alfa Laval Corporate Ab Method for joining metal parts

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2641560A (en) * 1949-07-12 1953-06-09 Norris O Taylor Means of applying a flux
US2684312A (en) * 1949-12-20 1954-07-20 Eutectic Welding Alloys Shaped borax-boric acid flux bodies
FR2193676A1 (en) * 1972-07-26 1974-02-22 Castolin Soldering/brazing material -contg a polymethacrylate as binder
FR2274392A1 (en) * 1974-06-14 1976-01-09 Degussa METHOD OF MANUFACTURING PARTS OF MATERIAL TO BE WELDED COATED IN FLUX AND PARTS OF FLUX
FR2414976A1 (en) * 1978-01-19 1979-08-17 Degussa BODY MOLDS

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2641560A (en) * 1949-07-12 1953-06-09 Norris O Taylor Means of applying a flux
US2684312A (en) * 1949-12-20 1954-07-20 Eutectic Welding Alloys Shaped borax-boric acid flux bodies
FR2193676A1 (en) * 1972-07-26 1974-02-22 Castolin Soldering/brazing material -contg a polymethacrylate as binder
FR2274392A1 (en) * 1974-06-14 1976-01-09 Degussa METHOD OF MANUFACTURING PARTS OF MATERIAL TO BE WELDED COATED IN FLUX AND PARTS OF FLUX
FR2414976A1 (en) * 1978-01-19 1979-08-17 Degussa BODY MOLDS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220212295A1 (en) * 2019-05-29 2022-07-07 Alfa Laval Corporate Ab Method for joining metal parts

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Publication number Publication date
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