WO2000076716A1 - Method for assembling metal parts with an induction-heated metallic powder - Google Patents
Method for assembling metal parts with an induction-heated metallic powder Download PDFInfo
- Publication number
- WO2000076716A1 WO2000076716A1 PCT/FR2000/001585 FR0001585W WO0076716A1 WO 2000076716 A1 WO2000076716 A1 WO 2000076716A1 FR 0001585 W FR0001585 W FR 0001585W WO 0076716 A1 WO0076716 A1 WO 0076716A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- parts
- powder
- temperature
- metal
- assembly
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/002—Soldering by means of induction heating
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
Definitions
- the invention arises from the assembly of metal parts with filler metal and is somewhat similar to brazing.
- the heating process is induction.
- brazing is carried out which consists in using a metal powder whose melting temperature is lower than the melting temperature of the two parts to be assembled.
- brazing methods using induction heating, using a filler metal in powder form.
- Many metals can be joined in this way, especially copper or stainless steel, using the appropriate filler materials.
- copper these are generally alloys with a high copper content and silver, or copper zinc.
- the soldering temperature is of the order of 700 to 800 ° C.
- the filler alloys are based on silver, copper, nickel or gold. Brazing is carried out between 700 and 1100 ° C.
- the various filler materials in powder form are often mixed with a flux. In all these cases, the filler material in powder form is a material different from the two parts to be assembled and has a melting temperature lower than the melting temperature of the two parts.
- the base metal powder is always accompanied by a filler material whose melting temperature is lower than that of the base metal. Pressure is always applied during the soldering cycle, so as to favor the elimination of pores at the level of the connection (see American patent US Pat. No. 5,812,925).
- the main object of the invention is a method of assembling two metal parts by melting a filler material, characterized in that it consists in:
- the use of these two combined means makes it possible in particular not to use any chemical input element and not to have to exert pressure at high temperature to make the connection.
- the two parts are of the same nature and the powder is of the same material as that constituting the parts, the melting temperature of the powder and of the parts being the same. It is possible to compact the powder before it is inserted between the two parts.
- the invention is somewhat similar to induction brazing, but differs from it by an essential point which is as follows.
- the filler material is a metal powder, the melting temperature of which is greater than or equal to the melting temperature of the two parts to be assembled in the case of the assembly of parts of the same material, or greater than or equal to the temperature of melting of the part with the lowest melting temperature in the case of parts of different natures.
- the induction heating of a metallic powder implies a much more complex distribution of the induced currents than in the case of the same material of a dense part because the medium constituted by a metallic powder is not not homogeneous.
- the presence and nature of oxide films on the surface of the particles influences the circulation of the currents induced in the powder. The rise in temperature due to the circulation of the induced currents is therefore very different in the powder compared to that in the parts.
- the powder in its initial state which is not the seat of induced currents
- the powder when the metal contacts between the particles are established and there can be circulation of induced currents in the initial state, namely ambient temperature, the coupling conditions are generally unfavorable for the powder, since the electrical resistivity of the powders used is very high, due to the presence of a surface layer of oxide on the particles.
- the temperature of the powder increases due to heat transfers with the dense parts.
- the surface layers of oxide which may exist on the surface of the particles of the powder change in nature or are eliminated.
- there are more and more metal contacts between the particles and their surfaces increase under the effect of temperature.
- the mode of circulation of the currents induced in the powder therefore changes significantly during heating, which results in a large variation in the efficiency of the heating.
- its temperature can be higher than that of dense parts. It is therefore possible to obtain its fusion without melting the pieces.
- the efficiency of induction heating is different depending on whether the powder particles are in metallic contact or electrically isolated from each other by oxide films.
- the induced currents develop at the periphery of the granular medium and facilitate, for example, the assembly of tubular parts.
- the behavior is very different in the case where the metal contacts between the particles of the filler metal are not created before assembly.
- the formation of the first contacts and the circulation of very intense induced currents cause very large voltage variations within the granular medium. It is possible to reach the values of "breakdown voltage" at the contacts covered with insulating films. In this case, the fusion at these contacts is reached quickly and extends to the whole of the granular medium.
- the powder can also be previously compacted, so as to facilitate its positioning between the parts to be assembled.
- the assembly is obtained thanks to the usual phenomena of wetting, capillarity, as for brazing.
- the quality of the assembly depends on the materials, the different parameters used, the initial characteristics of the powder and the temperature cycle.
- the metal parts and the powder can be made of a pure metal or an alloy.
- the powder can consist of a mixture of particles of different metals.
- the preferred application of this process relates to metallic parts and to powder made of the same material. So that the assembly can be carried out when all the powder is in the liquid state, the induction heating must stop when all the powder is melted.
- the basic steps of the process are as follows.
- An example is to assemble copper pellets with copper powder.
- the two pellets are cylindrical in shape, with a diameter of 20 mm and a height of 5 mm.
- a few grams of copper powder are sandwiched between the two copper pellets, so as to obtain a thin layer of copper of a few micrometers, distributed as uniformly as possible over the entire surface of the pellets.
- the particle size is of the order of 40 micrometers.
- Induction heating is carried out using a high-frequency generator with a power of 25 kW.
- the inductor used is an inductor with two turns, diameter 56 mm and height 10 mm.
- the assembly takes place under secondary vacuum at a frequency of 155 KHz.
- Another example consists in assembling Z2CN18-10 stainless steel pellets, commonly called AiSi 304 with Z12CN25-20 stainless steel powder, commonly called AiSi 310.
- the test results show that the mechanical strength of the assemblies is of the order of 70% of the breaking strength of the reference material and the elongation at break is 90% of that of the reference material.
- This process can be applied to different metals and alloys.
- the device preferably uses a high frequency generator, as a source of induction heating. This technique is therefore very easy to implement and directly usable as a replacement for traditional induction brazing for improved performance.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- General Induction Heating (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002376176A CA2376176A1 (en) | 1999-06-10 | 2000-06-08 | Method for assembling metal parts with an induction-heated metallic powder |
JP2001503026A JP2003501273A (en) | 1999-06-10 | 2000-06-08 | Joining method of metal parts using induction heated metal powder |
EP00940471A EP1198324A1 (en) | 1999-06-10 | 2000-06-08 | Method for assembling metal parts with an induction-heated metallic powder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR99/07339 | 1999-06-10 | ||
FR9907339A FR2794674B1 (en) | 1999-06-10 | 1999-06-10 | METHOD FOR ASSEMBLING METAL PARTS BY INDUCTION HEATED POWDER |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000076716A1 true WO2000076716A1 (en) | 2000-12-21 |
Family
ID=9546621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2000/001585 WO2000076716A1 (en) | 1999-06-10 | 2000-06-08 | Method for assembling metal parts with an induction-heated metallic powder |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1198324A1 (en) |
JP (1) | JP2003501273A (en) |
CA (1) | CA2376176A1 (en) |
FR (1) | FR2794674B1 (en) |
RU (1) | RU2002100210A (en) |
WO (1) | WO2000076716A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1057750A (en) * | 1952-06-06 | 1954-03-10 | Licencia Talalmanyokat | Process for joining together electrical conductors made of metals which cannot be welded together |
EP0761378A1 (en) * | 1995-09-06 | 1997-03-12 | Daido Tokushuko Kabushiki Kaisha | Method and apparatus for bonding crossing rails |
EP0764493A1 (en) * | 1995-09-20 | 1997-03-26 | I.S.C.-Industria Scambiatori Calore S.p.A. | Induction welding method and system for forming a fluidtight joint between metal pipes |
US5760378A (en) * | 1997-04-17 | 1998-06-02 | Aerojet-General Corporation | Method of inductive bonding sintered compacts of heavy alloys |
US5812925A (en) * | 1996-10-23 | 1998-09-22 | Ecer; Gunes M. | Low temperature bonding of materials |
-
1999
- 1999-06-10 FR FR9907339A patent/FR2794674B1/en not_active Expired - Fee Related
-
2000
- 2000-06-08 JP JP2001503026A patent/JP2003501273A/en active Pending
- 2000-06-08 EP EP00940471A patent/EP1198324A1/en not_active Withdrawn
- 2000-06-08 RU RU2002100210/02A patent/RU2002100210A/en not_active Application Discontinuation
- 2000-06-08 CA CA002376176A patent/CA2376176A1/en not_active Abandoned
- 2000-06-08 WO PCT/FR2000/001585 patent/WO2000076716A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1057750A (en) * | 1952-06-06 | 1954-03-10 | Licencia Talalmanyokat | Process for joining together electrical conductors made of metals which cannot be welded together |
EP0761378A1 (en) * | 1995-09-06 | 1997-03-12 | Daido Tokushuko Kabushiki Kaisha | Method and apparatus for bonding crossing rails |
EP0764493A1 (en) * | 1995-09-20 | 1997-03-26 | I.S.C.-Industria Scambiatori Calore S.p.A. | Induction welding method and system for forming a fluidtight joint between metal pipes |
US5812925A (en) * | 1996-10-23 | 1998-09-22 | Ecer; Gunes M. | Low temperature bonding of materials |
US5760378A (en) * | 1997-04-17 | 1998-06-02 | Aerojet-General Corporation | Method of inductive bonding sintered compacts of heavy alloys |
Also Published As
Publication number | Publication date |
---|---|
FR2794674B1 (en) | 2001-07-27 |
RU2002100210A (en) | 2003-07-20 |
CA2376176A1 (en) | 2000-12-21 |
FR2794674A1 (en) | 2000-12-15 |
JP2003501273A (en) | 2003-01-14 |
EP1198324A1 (en) | 2002-04-24 |
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