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Laser pulse influence on spreading of AlSi12-solder during fluxless laser brazing of aluminum

: Donst, D.; Janssen, A.; Niessen, M.; Klocke, F.

Liu, X.:
28th International Congress on Applications of Lasers & Electro-Optics, ICALEO 2009. Congress proceedings. CD-ROM : November 2 - 5, 2009 - Orlando, FL; Laser Materials Processing Conference, Laser Microprocessing Conference, Nanomanufacturing Conference, poster presentation, gallery
Orlando, Fla.: LIA, 2009 (LIA 612 = 102)
ISBN: 978-0-912035-59-8
International Congress on Applications of Lasers & Electro Optics (ICALEO) <28, 2009, Orlando>
Laser Materials Processing Conference (LMP) <2009, Orlando/Fla.>
Laser Microprocessing Conference (LMF) <2009, Orlando/Fla.>
Nanomanufacturing Conference (Nano) <2009, Orlando/Fla.>
Conference Paper
Fraunhofer IPT ()

Market and technology driven developments on aluminum light weight constructions require suitable joining techniques. Laser brazing of aluminum alloys is an appropriate technique that offers economical and technological advantage. However, the natural oxide layer on the surface of the aluminum alloys inhibits the wetting and thus constrains the laser brazing process. Currently the industry applies chemical aggressive and hazardous fluxes which are cost-intensive and laborious in use. Therefore Fraunhofer IPT developed a novel two-beam-technique for flux-less laser brazing of 6000 series aluminum alloys. The new technique uses simultaneously a continuous (cw) laser for heating and a pulse (pw) laser to improve the wetting behavior of AlSi12-solder. Thus, the use of pw laser enables a brazing process without using chemical fluxes. The high-intensity laser pulses ablate the oxide layer and cause a recoil pressure on the melted solder. The influence of the pressure results in spreading of the melted solder on the aluminum material. The aim of the actual investigations is to enhance the basic process know-how on the basis of computer simulations and experimental work. The middle-term goal of the investigations is to enable an industrial implementation of the novel laser brazing technique.