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Effect of Shortened Post Weld Heat Treatment on the Laser Welded AA7075 Alloy

Suckow, Timon ; Völkers, Stephan ; Bütev Öcal, Ezgi ; Grass, Markus ; Böhm, Stefan ; Groche, Peter (2022)
Effect of Shortened Post Weld Heat Treatment on the Laser Welded AA7075 Alloy.
In: Metals, 2022, 12 (3)
doi: 10.26083/tuprints-00021489
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Effect of Shortened Post Weld Heat Treatment on the Laser Welded AA7075 Alloy
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: MDPI
Journal or Publication Title: Metals
Volume of the journal: 12
Issue Number: 3
Collation: 17 Seiten
DOI: 10.26083/tuprints-00021489
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access

The present study provides an overview of previous studies on the welding of the AA7075-T6 aluminum alloy, followed by an investigation of the influence of short-time solution annealing on the mechanical properties of the weld. Conventional laser welding of Al-Zn-alloys leads to a low weld strength, which makes a post weld heat treatment (PWHT) favorable. The PWHT includes solution annealing, quenching and subsequent aging. For solution annealing, different holding times and cooling rates are investigated in this study. The focus of the investigation is on a short solution annealing time, which on the one hand is ecological and economically favorable and on the other hand offers great potential for inline heat treatments. The shortest solution annealing time of 10 s shows a significant increase in weld strength (joint efficiency of 72%), compared to the non-heat treated weld (joint efficiency of 52%). The microstructural analysis reveals that the cooling rate after solution heat treatment affects the formation of precipitates in the microstructure of the welded AA7075 alloy. Moreover, the enhancement of mechanical properties is related to the formation of Mg-Al-Cu and Mg-Zn rich precipitates.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-214893
Additional Information:

Keywords: high strength aluminum; welding; 7075; heat treatment; inline; microstructure

Classification DDC: 600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering > Institute for Production Engineering and Forming Machines (PtU)
16 Department of Mechanical Engineering > Institut für Produktionstechnik und Umformmaschinen (PtU) > Process chains and forming units
Date Deposited: 07 Jun 2022 12:16
Last Modified: 22 Aug 2022 09:33
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21489
PPN: 495422428
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