BE454153A - - Google Patents
Info
- Publication number
- BE454153A BE454153A BE454153DA BE454153A BE 454153 A BE454153 A BE 454153A BE 454153D A BE454153D A BE 454153DA BE 454153 A BE454153 A BE 454153A
- Authority
- BE
- Belgium
- Prior art keywords
- welding
- sheets
- soaps
- rust
- coatings
- Prior art date
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000344 soap Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000002966 varnish Substances 0.000 claims description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M Sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 210000001503 Joints Anatomy 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000004432 carbon atoms Chemical group C* 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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
- B23K35/3612—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 organic compounds as principal constituents
- B23K35/3618—Carboxylic acids or salts
Description
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Soudage du fer,
Il est connu de préparer les tôles de fer ou d'acier pour le soudage par points ou pour le soudage de joints, en recouvrant les faces à souder d'enduits, particulièrement d'enduits anti- rouille, composés, par exemple, de vernis, de résines aldéhydiques, de résines phénoliques modifiées, en qualité de liant, et de minium., en qualité de pigment. Cependant les tôles ainsi enduites présen- tent au soudage un défaut essentiel à cause de la résistance élec- trique relativement élevée de la couche antirouille double à qua- druple à l'endroit de la soudure. La surchauffe locale en résul- tant entraîne, surtout dans le cas des tôles d'acier une trempe locale indésirable du matériau, celle-ci entraînant a son tour la formation de fissures et, dans certains cas, même un détache- ment par rupture de parties de la soudure.
Par contre, si l'on n'emploie pas d'enduit il se forme des foyers de rouille qui ne peuvent plus être enrayés dans la suite par des moyens de conser- vation, surtout pas dans les cas où l'on :a affaire à deux tôles soudées par recouvrement.
Or, il a été trouvé suivant la présente invention qu'il est possible d'obtenir une protection contre la rouille et simul- tanément un bon passage du courant, ou une bonne conductibilité électrique, en évitant ainsi les endroits défectueux à caracté- ristiques mécaniques défavorables, lorsqu'on emploie comme enduits des savons insolubles dans l'eau, particulièrement des savons de métaux polyvalents. Par savons il faut entendre les sels des aci- des gras à poids moléculaire relativement élevé, par exemple, les portions à poids moléculaire très élevé des acides gras obtenus par l'oxydation de la paraffine, particulièrement de la paraffine provenant de l'hydrogénation de l'oxyde de carbone. Les acides gras de cette espèce renferment environ 20 à 40 atomes de carbone par molécule.
Du brai stéarique est également utilisable, et à côté de ce dernier aussi les acides résineux. La[transformation des acides en savons est effectuée utilement en les faisant réagir avec des oxydes, des hydrates ou des sels des acides faibles, res- pectivement volatils, des métaux en question. Un métal particuliè- rement convenable est le zinc. On évitera de préférence l'emploi de quantités relativement grandes de forts agents formateurs de produits siccatifs.
Il est utile de pigmenter ces enduits au moyen de substan- ces à conductibilité électrique, particulièrement au moyen de noir de fumée et/ou de graphite, en outre aussi au moyen de poudres métalliques, comme la poudre d'aluminium. On procédera d'une manière particulièrement avantageuse en munissant les tôles de fer, avant le soudage, non pas d'un enduit antirouille définitif, mais @
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en employant un enduit suivant l'invention seulement comme première couche, en en recouvrant utilement les tôles entières sur les deux faces. Après le soudage on procède alors au vernissage usuel.
REVENDICATIONS l.- Préparation de tôles de fer au moyen d'enduits, pour le soudage électrique par points ou pour le soudage électrique de joints, caractérisé en ce qu'on emploie, comme enduits, des savons métalliques insolubles dans l'eau, utilement pigmentés au moyen de substances conductrices électriques.
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Iron welding,
It is known to prepare iron or steel sheets for spot welding or for welding seams, by covering the faces to be welded with plasters, particularly anti-rust plasters, composed, for example, of varnish. , aldehyde resins, modified phenolic resins, as a binder, and red, as a pigment. However, the sheets thus coated show an essential defect on welding because of the relatively high electrical resistance of the double to quadruple anti-rust layer at the place of the weld. The resulting local overheating leads, especially in the case of steel sheets, to undesirable local hardening of the material, which in turn leads to the formation of cracks and, in some cases, even detachment by rupture of the material. parts of the weld.
On the other hand, if one does not use a plaster, foci of rust are formed which can no longer be stopped later by means of conservation, especially not in cases where one is dealing with with two sheets welded by overlap.
Now, according to the present invention, it has been found that it is possible to obtain protection against rust and at the same time good flow of current, or good electrical conductivity, thus avoiding defective places with mechanical characteristics. unfavorable, when water-insoluble soaps, particularly polyvalent metal soaps, are used as coatings. By soaps is meant the salts of relatively high molecular weight fatty acids, for example, the very high molecular weight portions of fatty acids obtained by the oxidation of paraffin, particularly paraffin from the hydrogenation of carbon monoxide. The fatty acids of this species contain about 20 to 40 carbon atoms per molecule.
Stearic pitch can also be used, and next to it also resinous acids. The conversion of acids to soaps is usefully effected by reacting them with oxides, hydrates or salts of weak acids, respectively volatile, of the metals in question. A particularly suitable metal is zinc. The use of relatively large amounts of strong drying agents is preferably avoided.
It is useful to pigment these coatings by means of electrically conductive substances, particularly by means of carbon black and / or graphite, in addition also by means of metallic powders, such as aluminum powder. This will be done in a particularly advantageous manner by providing the iron sheets, before welding, not with a definitive anti-rust coating, but @
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by using a coating according to the invention only as a first layer, by usefully covering the entire sheets with it on both sides. After welding, the usual varnishing is then carried out.
CLAIMS 1. Preparation of iron sheets by means of coatings, for electrical spot welding or for electrical welding of joints, characterized in that, as coatings, metallic soaps insoluble in water are used, usefully pigmented with electrically conductive substances.
Claims (1)
Publications (1)
Publication Number | Publication Date |
---|---|
BE454153A true BE454153A (en) |
Family
ID=108364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE454153D BE454153A (en) |
Country Status (1)
Country | Link |
---|---|
BE (1) | BE454153A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2429642A1 (en) * | 1978-06-28 | 1980-01-25 | Kauppi Markku |
-
0
- BE BE454153D patent/BE454153A/fr unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2429642A1 (en) * | 1978-06-28 | 1980-01-25 | Kauppi Markku |
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