What is it about?
Hot Forming and in-die Quenching (HFQ), a patented hot stamping process, has been introduced to manufacture complex-shaped high-strength heat-treatable aluminum alloys. The work described in this article is an experimental investigation of the weldability between AA6082 and AA7075 by Friction Stir Welding (FSW) that considers thermal treatments used during HFQ for automotive applications.
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Why is it important?
The increased strength-to-weight ratio and the thermal treatment processing open the possibility to use these alloys as possible alternative materials instead of steel in the automotive industry for the fabrication of car body parts. However, their poor formability and weldability are the main drawbacks when these alloys are considered as substitutes of steel and other dissimilar joints during the fabrication of car body parts and the production chain. The aforementioned FSW base metals, 6082 and 7075, are heat treated according to the solution heat treatment adopted during HFQ to evaluate the effect of the HFQ thermal cycle on the quality of the produced joints. Optical microscopy has been used to characterize the microstructure of the produced joints. The defect-free welded joints are characterized by good mechanical mixing between the joined materials as well as by grain refinement.
Perspectives
Researchers working in automotive applications of aluminum alloys and their formability and weldability might find this article interesting.
Dimitrios Dragatogiannis
National Technical University of Athens
Read the Original
This page is a summary of: Friction Stir Welding between 6082 and 7075 Aluminum Alloys Thermal Treated for Automotive Applications, Materials Performance and Characterization, April 2019, ASTM International,
DOI: 10.1520/mpc20180179.
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