WO1991004825A1 - Procede de brasage sans fondant d'elements en aluminium - Google Patents

Procede de brasage sans fondant d'elements en aluminium Download PDF

Info

Publication number
WO1991004825A1
WO1991004825A1 PCT/NO1990/000149 NO9000149W WO9104825A1 WO 1991004825 A1 WO1991004825 A1 WO 1991004825A1 NO 9000149 W NO9000149 W NO 9000149W WO 9104825 A1 WO9104825 A1 WO 9104825A1
Authority
WO
WIPO (PCT)
Prior art keywords
members
vibration
tubes
soldering
joints
Prior art date
Application number
PCT/NO1990/000149
Other languages
English (en)
Inventor
Geoffrey Eamonn Doyle
Original Assignee
Norsk Hydro A.S
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 Norsk Hydro A.S filed Critical Norsk Hydro A.S
Publication of WO1991004825A1 publication Critical patent/WO1991004825A1/fr

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
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing heat exchangers
    • 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
    • B23K1/06—Soldering, e.g. brazing, or unsoldering making use of vibrations, e.g. supersonic vibrations

Definitions

  • the present invention relates to fluxless soldering of Al- members, where at least one of the joined (soldered) members is provided with a zinc alloy solder layer being metallurgically bonded to the Al-substrate, and more particularly to a fluxless soldering process applying vibration on selected assembled members.
  • Another object of the present invention is to provide a soldering method with no hazardous fumes emission, no need for post-cleaning operations and utilizing a conventional normal atmosphere furnace.
  • Fig. 1 shows schematically the principle of insert ⁇ ing a mandrel into the assembled tubes
  • Fig. 2 is a photographic picture of the achieved joints between the finstock and the tubing
  • Fig. 3 illustrates more clearly provision of high strength and high integrity joints between the tubing and the finstock.
  • the disclosed method of fluxless soldering of Al-members is especially adapted for a commercial production of heat ex ⁇ changer cores comprising tubes, fins, header and side plates, where at least the tubes and preferentially also the plates are coated on one side with a zinc alloy solder layer which is metallurgically bonded to the Al-substrates.
  • the above assembly of individual components is inserted into a conventional furnace operating with normal atmosphere to melt the applied solder material. Referring to Fig. 1, arriving at the predeterminated soldering temperature a vibrating mandrel 7 is run through the tubes and retracted out again.
  • Fig. 1 shows schematically the assembled heat exchanger core (1) com ⁇ prising header plates 2 provided with apertures 21 to accomodate a plurality of parallel flat oval tubes 3. Coated or uncoated fins 4 are placed in a zig zag pattern between the zinc coated flat tubes 3. Side plates 5 are engaged between the top plates or headers 2 in order to encapsulate the formed core assembly.
  • the applied vibration breaks up the oxide on the surface of the molten zinc alloy allowing for free flow of the solder to form the joints.
  • the achieved certain mechanical expansion of the tubes ensures a good and reliable contact during the soldering operation, and furthermore this also results in the expulsion of zinc oxide and eventual excess (surplus) of the zinc solder from the joint.
  • the resulting soldered joints exhibit high strength and show a perfect "fillet", as illustrated in Figs. 2 and 3.
  • the sample was heated up to 420°C in order to melt the zinc alloy solder material.
  • the sample was then air cooled to solidify the solder material followed by a water quench.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molten Solder (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

Un procédé de brasage sans fondant d'éléments en aluminium comprend l'expansion et la vibration mécaniques simultanées de certains des éléments en aluminium assemblés et dotés d'une couche de soudure avant le brasage. Les vibrations sont transmises par conduction grâce à l'introduction de mandrins vibrants dans les éléments creux (tubes) assemblés.
PCT/NO1990/000149 1989-10-06 1990-10-01 Procede de brasage sans fondant d'elements en aluminium WO1991004825A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO894006A NO168345C (no) 1989-10-06 1989-10-06 Fremgangsmaate ved lodding av al-komponenter
NO894006 1989-10-06

Publications (1)

Publication Number Publication Date
WO1991004825A1 true WO1991004825A1 (fr) 1991-04-18

Family

ID=19892452

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1990/000149 WO1991004825A1 (fr) 1989-10-06 1990-10-01 Procede de brasage sans fondant d'elements en aluminium

Country Status (3)

Country Link
AU (1) AU6446390A (fr)
NO (1) NO168345C (fr)
WO (1) WO1991004825A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0240954A1 (fr) * 1986-04-04 1987-10-14 Norsk Hydro A/S Procédé pour fabriquer des connexions soudées sans flux et échangeur thermique fabriqué d'après ce procédé
US4754913A (en) * 1986-06-27 1988-07-05 Norsk Hydro A.S. Method of joining zinc coated aluminum members and uncoated aluminum members

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0240954A1 (fr) * 1986-04-04 1987-10-14 Norsk Hydro A/S Procédé pour fabriquer des connexions soudées sans flux et échangeur thermique fabriqué d'après ce procédé
US4754913A (en) * 1986-06-27 1988-07-05 Norsk Hydro A.S. Method of joining zinc coated aluminum members and uncoated aluminum members

Also Published As

Publication number Publication date
NO894006L (no) 1991-04-08
NO168345C (no) 1992-02-12
AU6446390A (en) 1991-04-28
NO894006D0 (no) 1989-10-06
NO168345B (no) 1991-11-04

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