WO2002096595A2 - Lattes de soudure en materiau composite. - Google Patents
Lattes de soudure en materiau composite. Download PDFInfo
- Publication number
- WO2002096595A2 WO2002096595A2 PCT/FR2002/001842 FR0201842W WO02096595A2 WO 2002096595 A2 WO2002096595 A2 WO 2002096595A2 FR 0201842 W FR0201842 W FR 0201842W WO 02096595 A2 WO02096595 A2 WO 02096595A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductive
- chosen
- batten
- composite material
- conductive particles
- Prior art date
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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/06—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for positioning the molten material, e.g. confining it to a desired area
Definitions
- the present invention relates to welding slats made of composite material.
- Welding laths are accessories used during welding operations. They are also designated in the technical field by support or welding support. They serve as a support for the weld material and are placed at the joint between two parts to be welded, to prevent the molten weld metal from escaping. They are generally in the form of a ribbon having a variable section.
- the properties sought for a material used for the preparation of a weld strip are a high melting point, good mechanical resistance, good thermal conductivity, a low degree of hygroscopicity, inertia with respect to the base metal. constituting the parts to be welded and the filler metal, and a low production cost. To meet these criteria, mineral oxides or mixtures of oxides were used for the production of the welding laths.
- cordierite 2Mg0.2A1 2 0 3 .5Si0 2
- mullite 3Al 2 0 3 .2Si0 2
- the use of these weld strips has some drawbacks due to their insulating nature.
- sparks and instability arise from the spacing between the parts to be welded when they are very long. These phenomena make the welding irregular and require the direct and manual intervention of qualified personnel. Automation that would reduce costs and increase productivity is therefore very difficult to implement, if not impossible.
- the object of the present invention is to provide welding bars which no longer have these drawbacks.
- the subject of the present invention is a weld strip, characterized in that it is constituted by a composite material comprising a matrix consisting of at least one non-conductive phase and conductive particles distributed within the matrix, the concentration in conductive particles being at least equal to the percolation threshold.
- the percolation threshold corresponds to the volume fraction of conductive phase present in the material, below which the material cannot be traversed by a current, and from which the material can convey an electric current when it is subjected to a potential difference.
- non-conductive phase comprises a single oxide, mixed oxide, or a mixture of one or more simple oxides and / or one or more oxides mixed, each of the constituents to be chemically compatible with the metal (or metals) likely to come into contact with it during the welding operation.
- Mixed oxides constitute a very broad category of compounds and include binary oxides and ternary oxides.
- - silicates in particular binary compounds such as Na 2 O.Si0 2 , Na 2 0.2Si0 2 , K 2 0.2Si0 2 , MgO.Si0 2 , mullite (3Al 2 0 3 .2Si0 2 ), forsterite 2MgO.Si0 2 , pseudowollastonite CaO.Si0 2 , fayalite (2FeO.Si0 2 ); and ternary compounds such as Na 2 ⁇ .Al0 .2Si0 2 , K 2 O.Al 2 ⁇ 3 .4Si ⁇ 2 1 'anorthite CaO.Al 2 0 3 .2Si0 2 , cordierite (2Mg0.2Al 2 0 3 .5Si0 2 ), gehlenite (2CaO.Al 2 0
- oxides 5 are compounds derived from the preceding by partial replacement of the metal or metalloid element, such as 2 (Mg l _ x Fe x ) O.2Al 2 0 3 .5SiO 2 ) , (CaO) x (MgO) ⁇ _ x .2Si0 2 ,
- the material constituting the weld strip may contain oxides in crystallized form, oxides in amorphous form or a mixture of the two forms.
- the amorphous shape 15 is present when the material constituting the slat has undergone firing during production. Slats made of a material in which the non-conductive phase is in crystallized form are particularly preferred.
- the conductive particles consist of one or more metallic phases consisting of an element chosen from Fe, Cr, Ni, Cu, Mn, Zn, Pb, V, Ti and Sn, or by several of these elements in the form of intermetallic compounds or alloys.
- the metal phases can be in amorphous form or not.
- Conductive particles. 5 can also consist of one or more conductive compounds such as carbides, borides, silicides and nitrides. Mention may in particular be made of TiC, TiN, TiB 2 , MoSi 2 or ⁇ -FeSi 2 . Mixed compounds can be used in which the element C, N or Si is partially replaced by at least one other element of the same nature, the presence of a small amount of oxygen being tolerated.
- a compound TiC ⁇ - x - y N x O y with 0 ⁇ x + y ⁇ l.
- These compounds, in particular Sic, can also be used in doped form.
- the conductive particles can also consist of certain oxides which are conductive at the temperature of use of the welding strip.
- oxides such as ⁇ alumina, doped zirconia (unless 20 mole% by CaO, Y 2 0 3 , MgO or Ce0 2 ) are conductive by ion transport above a certain temperature.
- Semiconductors which are conductive by electronic transport can also be used, for example 5 TiO, Ti 2 0 3 , VO, V 2 0 3 , Fe 3 0 4 .
- the composite material constituting the welding laths can be prepared by the usual methods for producing ceramics or by the conventional methods of powder metallurgy.
- natural mineral raw materials can be used such as clays (containing A1 2 0 3 and / or Si0 2 ), limestone or dolomite (Ca x Mg ⁇ _ x ) C0 3 , zircon ZrSi0 4 or talc (containing MgO). You can also use materials
- purified synthetics for example A1 2 0 3 , Si0 2 or MgO.
- product * recycling for example scrap or mill scale which provide mixtures Fe / FeO, dairy or metallurgical slag, the composition is in the system Si0 2 -CaO-MgO-Al0 3 and 0 sometimes contains FeO and / or MnO in minority concentration.
- Such materials can be modified by adding appropriate additives to obtain the desired phase or phases, for example the cordierite or mullite phase.
- volcanic rocks such as basalts can be used.
- the conductive particles can be incorporated into the material forming the weld strip either in the form of pure compounds, or in the form of industrial waste, for example machining sludge or calamines.
- the dry processes with or without binders
- the wet processes which use the starting materials in the form of paste or suspension
- methods employing controlled recrystallization from a vitrified liquid are particularly useful.
- the powder metallurgy processes generally include wet or dry (possibly high energy) grinding, mixing, setting up form, consolidation heat treatment (with or without debinding).
- the grinding / mixing and heat treatment stages allow the properties of the final material to be adjusted.
- the grinding and mixing conditions are adapted
- the slats of the invention which have good electrical conductivity, • also show improved thermal conductivity over a latte
- Example 1 5 Various samples of a composite material A1 2 0 3 were prepared, some from a mixture containing 26.2% by mass of Al and 73.8% by mass of Cr 2 0 3 , the others from a mixture of 50.5% by mass of Cr and 49.5% by mass of A1 2 0 3 . 0 In all cases, the constituents were mixed by high energy grinding in air. The mixing was carried out in a planetary ball mill Pulverisette marketed by the company Fritsch and equipped with 4 jars of 400 ml in SS 116 steel, for a total duration of 55 hours, by sequences of 1 h of grinding at a speed of 360 rpm rotation followed by a 15 min stop. During grinding, each jar contained 50 g of grinding powder and 15 steel balls (500 g) 20 mm in diameter. At the end of the grinding / mixing operations, the material was shaped, either by uniaxial pressing, or by natural sintering.
- Uniaxial pressing was carried out hot in a graphite matrix at 1400 ° C for about 30 min. It makes it possible to obtain a fully densified product which has a microstructure consisting of a metallic Cr phase in the form of more or less spherical particles in a ceramic matrix A1 2 0 3 , the size and distribution of which
- the materials obtained are in the form of pellets having a thickness of 5-6 mm and a diameter of approximately 30 mm.
- the samples were characterized by X-ray diffraction.
- the components were mixed by high energy grinding in air.
- the mixing was carried out in a planetary ball mill Pulverisette marketed by the company Fritsch and equipped with 4 jars of 400 ml in SS 116 steel.
- Four samples were prepared under the same conditions with different grinding times (1/2 h , 1 a.m., 2 a.m. and 6 a.m.).
- the 10 .. grinding cycle includes 1 h of grinding followed by 15 min of stopping.
- the total duration of the preparation is therefore 2 h 15 min, and 7 h 30 min.
- each jar contained 50 g of powder
- the material was put into the form of pellets having a diameter of 30 mm and a thickness of 8 mm, by cold uniaxial pressing in a mechanical press with a compaction rate of 65%, then consolidated by cooking 0 under secondary vacuum (10 ⁇ 4 Torr) at temperatures between 1350 ° C and 1400 ° C for 1 hour. After sintering, the material is completely densified and has a microstructure consisting of a metallic iron phase in the form of spheroidal particles in a ceramic cordierite matrix. Only the sample having undergone a grinding time of 6 h is conductive of the electric current.
- a mullite-Fe composite material (30% vol. Fe) was obtained from a mixture of industrial mullite powder and pure iron powder. The material was obtained by high energy grinding followed by natural sintering.
- the grinding was carried out in a planetary ball mill Pulverisette marketed by the company Fritsch and equipped with 4 jars of 400 ml in SS 116 steel for a grinding duration of 2 h, in cycles including 1/2 h of grinding and 1/2 h of stopping, for a total duration of 4 h.
- each jar contained 50 grinding powder and 15 steel balls (500 g) 20 mm in diameter.
- the material was put into the form of pellets having a diameter of 30 mm and a thickness of 8 mm, by cold uniaxial pressing in a mechanical press with a compaction rate of 65%, then consolidated " through
- the material obtained is magnetic and conductive of the electric current.
- FIG. 4 represents the X-ray diffraction diagram (Co radiation, K ⁇ ⁇ ) of the sample obtained.
- the lines marked • correspond to Fe
- the lines marked O 0 correspond to mullite.
- a mullite - Fe composite material (containing 30% by volume of Fe) was prepared from a mixture of industrial mullite powder and pure iron powder, according to the procedure described in Example 3, but by adding water as a binder to the mixture before uniaxial pressing, in order to facilitate demolding.
- the material After sintering, the material is completely densified and has a microstructure and an electrical conductivity 0 similar to that of the material of Example 3.
- Pellets of mullite-iron composite material obtained according to the procedure of Example 3 were used as a welding strip for welding two steel sheets 5 8 mm thick.
- the parts to be assembled is large. In the present case, it is the “mullite + iron” material which ensures the conductivity between the parts to be assembled and the electrode. The use of this material allows ignition between the electric arc regardless of the position of the electrode relative to the edges of the
- Example 6 5 A weld strip was prepared and used for welding steel sheets under the same conditions as in Example 5, but using pellets of material obtained in accordance with the procedure described in Example 4 and by polishing the lath with sandpaper before use, to improve electrical conductivity.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-7015493A KR20040005993A (ko) | 2001-06-01 | 2002-05-31 | 복합재료로 제조된 용접 지지체 |
JP2002593097A JP2004534657A (ja) | 2001-06-01 | 2002-05-31 | 複合材料からなる溶接スラット |
EP02743344A EP1392468A2 (fr) | 2001-06-01 | 2002-05-31 | Lattes de soudure en materiau composite. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0107268A FR2825306B1 (fr) | 2001-06-01 | 2001-06-01 | Latte de soudure en materiau composite |
FR01/07268 | 2001-06-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002096595A2 true WO2002096595A2 (fr) | 2002-12-05 |
WO2002096595A3 WO2002096595A3 (fr) | 2003-02-13 |
Family
ID=8863917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/001842 WO2002096595A2 (fr) | 2001-06-01 | 2002-05-31 | Lattes de soudure en materiau composite. |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1392468A2 (fr) |
JP (1) | JP2004534657A (fr) |
KR (1) | KR20040005993A (fr) |
FR (1) | FR2825306B1 (fr) |
WO (1) | WO2002096595A2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100850648B1 (ko) * | 2007-01-03 | 2008-08-07 | 한국과학기술원 | 산화물을 이용한 고효율 열발생 저항기, 액체 분사 헤드 및장치, 및 액체 분사 헤드용 기판 |
JP2017524801A (ja) * | 2014-08-14 | 2017-08-31 | アルテコ コリア カンパニー リミテッド | 伝導性複合体及びその製造方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2729238A1 (de) * | 1977-06-29 | 1979-01-18 | Josef Kratz | Formbacke fuer das verschweissen von eisenbahnschienen, oberbauprofilen o.dgl. mit stab- oder drahtelektroden |
EP0750964A1 (fr) * | 1995-06-29 | 1997-01-02 | Sollac S.A. | Dispositif de soudage d'au moins deux flans métalliques au moyen d'un faisceau à haute densité d'énergie |
EP0882543A2 (fr) * | 1997-06-06 | 1998-12-09 | MITSUI ENGINEERING & SHIPBUILDING CO., LTD | Elément et procédé pour le soudage |
-
2001
- 2001-06-01 FR FR0107268A patent/FR2825306B1/fr not_active Expired - Fee Related
-
2002
- 2002-05-31 EP EP02743344A patent/EP1392468A2/fr not_active Withdrawn
- 2002-05-31 WO PCT/FR2002/001842 patent/WO2002096595A2/fr active Application Filing
- 2002-05-31 JP JP2002593097A patent/JP2004534657A/ja active Pending
- 2002-05-31 KR KR10-2003-7015493A patent/KR20040005993A/ko not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2729238A1 (de) * | 1977-06-29 | 1979-01-18 | Josef Kratz | Formbacke fuer das verschweissen von eisenbahnschienen, oberbauprofilen o.dgl. mit stab- oder drahtelektroden |
EP0750964A1 (fr) * | 1995-06-29 | 1997-01-02 | Sollac S.A. | Dispositif de soudage d'au moins deux flans métalliques au moyen d'un faisceau à haute densité d'énergie |
EP0882543A2 (fr) * | 1997-06-06 | 1998-12-09 | MITSUI ENGINEERING & SHIPBUILDING CO., LTD | Elément et procédé pour le soudage |
Also Published As
Publication number | Publication date |
---|---|
FR2825306A1 (fr) | 2002-12-06 |
KR20040005993A (ko) | 2004-01-16 |
EP1392468A2 (fr) | 2004-03-03 |
WO2002096595A3 (fr) | 2003-02-13 |
JP2004534657A (ja) | 2004-11-18 |
FR2825306B1 (fr) | 2004-11-19 |
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