Change of hot cracking susceptibility in welding of high strength aluminum alloy AA 7075
Holzer M, Hofmann K, Mann V, Hugger F, Roth S, Schmidt M (2016)
Publication Type: Conference contribution
Publication year: 2016
Journal
Publisher: Elsevier B.V.
Book Volume: 83
Pages Range: 463-471
Conference Proceedings Title: Physics Procedia
Event location: Fürth
DOI: 10.1016/j.phpro.2016.08.048
Abstract
High strength aluminum alloys are known as hard to weld alloys due to their high hot crack susceptibility. However, they have high potential for applications in light weight constructions of automotive industry and therefore it is needed to increase weldability. One major issue is the high hot cracking susceptibility. Vaporization during laser beam welding leads to a change of concentration of the volatile elements magnesium and zinc. Hence, solidification range of the weld and therefore hot cracking susceptibility changes. Additionally, different welding velocities lead to changed solidification conditions with certain influence on hot cracking. This paper discusses the influence of energy per unit length during laser beam welding of AA 7075 on the change of element concentration in the weld seam and the resulting influence on hot cracking susceptibility. Therefore EDS-measurements of weld seams generated with different velocities are performed to determine the change of element concentration. These quantitative data is used to numerically calculate the solidification range in order to evaluate its influence on the hot cracking susceptibility. Besides that, relative hot crack length and mechanical properties are measured. The results increase knowledge about welding of high strength aluminum alloy AA 7075 and hence support further developing of the welding process.
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How to cite
APA:
Holzer, M., Hofmann, K., Mann, V., Hugger, F., Roth, S., & Schmidt, M. (2016). Change of hot cracking susceptibility in welding of high strength aluminum alloy AA 7075. In Physics Procedia (pp. 463-471). Fürth, DE: Elsevier B.V..
MLA:
Holzer, M., et al. "Change of hot cracking susceptibility in welding of high strength aluminum alloy AA 7075." Proceedings of the 9th International Conference on Photonic Technologies, LANE 2016, Fürth Elsevier B.V., 2016. 463-471.
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