Mechanical Property Analysis into the Welded Plates of Al‑6061 Joined by TIG and FSW Techniques
[ 1 ] Instytut Technologii Mechanicznej, Wydział Inżynierii Mechanicznej, Politechnika Poznańska | [ P ] employee
2023
scientific article
english
- Al-6061
- TIGW
- FSW
- Tensile strength
- Toughness
- Hardness
- Microstructure
- Fractography
EN The present work deals with the welding of aluminium (6061) plates by using tungsten inert gas welding (TIGW) and friction stir welding (FSW) methods. Two such pairs of welded plates were prepared by applying two different welding methods on them. Both plates were compared based on tensile strength, hardness, toughness, and microstructural attributes. To deal with the fracture behaviour of the joint, the fractography analysis was also carried out. Despite possessing a critical response to welding, aluminium alloys can be easily welded by TIG and FSW techniques. Both types of welding methods have provided similar ultimate tensile strength of 64 MPa. The hardness pattern is also similar in both the plates, i.e., hardness is maximum at base metal, and it is minimum at welded zone (WZ). The melting and solidification process has made the secondary phase coarser and globular which causes a reduction in hardness and toughness at the WZ. The FSW joint has been found tougher (nearly double) than the TIGW joint. The fractographic images obtained through field emission scanning electron microscope are in good corroboration with the results of strength and toughness tests.
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