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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. (Publisher's Version)
In: Metals, 12 (3), MDPI, e-ISSN 2075-4701,
DOI: 10.26083/tuprints-00021489,
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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Effect of Shortened Post Weld Heat Treatment on the Laser Welded AA7075 Alloy
Language: English
Abstract:

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.

Journal or Publication Title: Metals
Volume of the journal: 12
Issue Number: 3
Place of Publication: Darmstadt
Publisher: MDPI
Collation: 17 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Institut für Produktionstechnik und Umformmaschinen (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
DOI: 10.26083/tuprints-00021489
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-214893
Additional Information:

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

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21489
PPN: 495422428
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