Paper Titles
Process Characteristics of Laser Brazing Aluminium Alloys
p.135
Joining of Steel-Aluminium Hybrid Structures with Electron Beam on Atmosphere
p.143
Non-Vacuum Electron Beam Welding
p.151
The Effect of Pre-Straining on the Mechanical Behaviour of Self-Piercing Riveted Aluminium Alloy Sheets
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Flux-Less Joining Technique of Aluminium with Zinc-Coated Steel Sheets by a Dual-Spot-Laser Beam
p.163
High-Power Fibre Lasers – Application Potentials for Welding of Steel and Aluminium Sheet Material
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Influence of Magnetic Fields on Dilution during Laser Welding of Aluminium
p.179
Investigations on Seam Quality in Laser Beam Welding of Contaminated, Zinc Coated Sheets
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Computing Welding Distortion: Comparison of Different Industrially Applicable Methods
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Flux-Less Joining Technique of Aluminium with Zinc-Coated Steel Sheets by a Dual-Spot-Laser Beam

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Abstract:

Joining of iron with aluminium in the liquid phase is complicated due to the formation of brittle intermetallics within Fe-Al melts. In this work we present the technology of a laser weldingbrazing (LWB) process to join zinc-coated steel and aluminium sheets in an overlap geometry. The process is divided into welding of the aluminium sheet and brazing of filler material and molten aluminium sheet onto the zinc-covered steel sheet to avoid the liquid stage of iron. It is possible to join those materials with a single laser beam. However, with a second laser beam, the melt flow can be controlled more effectively and the wetting behaviour can be improved by preheating the zinc-covered steel sheet surface. This is beneficial since the process works without any flux agent. Wetting lengths increase by using this technique and generate a joint that exceeds the tensile strength of the base material. Due to the zinc cover on the steel sheet there are two possible filler materials that have miscibility with zinc as well as aluminium. Zinc based filler materials have the advantage of a lower melting point and thus lower process temperatures. And aluminium based filler wires result in more ductile brazed seams, making it possible to deform such joints in a later application as tailored blanks.

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Periodical:

Advanced Materials Research (Volumes 6-8)

Pages:

163-170

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.6-8.163

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Online since:

May 2005

Authors:

H. Laukant, C. Wallmann, M. Korte, Uwe Glatzel

Keywords:

Aluminum (Al), Laser, Steel

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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