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AluSZW
Development of new filler materials for welding of aluminium structures by spray forming
The hot cracking phenomenon is frequently observed in laser welding of high strength aluminum alloys. Modifying the chemical composition of the weld metal is a proven remedy to reduce the hot cracking susceptibility. For this purpose, filler material is generally applied in wire form. However, in laser welding the weld metal is typically composed from a large amount of base material and mixed with a comparatively small amount of filler material. Thus to avoid hot cracking a high concentration of alloying elements (especially grain refiners) in the filler wire is required. The poor formability does not allow wire production of conventionally cast hypereutectic alloys. In contrast, the spray forming process is a production process to generate a homogenous and fine-grained alloy in a very wide range of compositions. The billets have been produced by spray forming and were extruded and drawn to 1.2 mm filler wires and rectangular stripes. Their usability and effectiveness was proven in improved properties of laser beam welded seams.
Due to the external tensile stresses, which are applied before welding starts, hot cracks were investigated. The results have been evaluated on the basis of static and dynamic strength investigations.
Funded by
AiF
Timeframe
2006/02/01 - 2008/01/31
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