6533b82dfe1ef96bd1291449
RESEARCH PRODUCT
In-process control strategies for friction stir welding of AZ31 sheets with non-uniform thickness
Michela SimonciniUmberto La CommareGianluca BuffaLivan FratiniArchimede ForcelleseDavide Campanellasubject
0209 industrial biotechnologyMaterials scienceFriction stir welding02 engineering and technologyWeldingRotationIndustrial and Manufacturing Engineeringlaw.invention020901 industrial engineering & automationlawTailor welded blankFriction stir weldingComposite materialMagnesium alloyJoint (geology)Settore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneMechanical EngineeringMetallurgyRotational speedComputer Science Applications1707 Computer Vision and Pattern Recognition021001 nanoscience & nanotechnologyMicrostructureGrain sizeComputer Science ApplicationsControl and Systems Engineering0210 nano-technologyMagnesium alloySoftwaredescription
Two different in-process control strategies were developed and compared with the aim to produce AZ31 magnesium alloy joints by friction stir welding on sheet blanks with a non-uniform thickness. To this purpose, sheets with dip or hump zones were welded by either changing the rotational speed or the tool plunging in order to keep constant the value of the vertical force occurring during the welding stage of the process. The influence of the main process parameters on the tool force, the micro- and macromechanical properties, and the joints microstructures in the dip and hump zones were analyzed. The results showed that using the rotational speed change-based approach, the hump zones are subjected to increased heat input with consequent increase of the heat-affected zone extension and average grain size (up to 11 μm). On the contrary, using the tool plunge change-based approach, the weld seam thickness in the dip zones is reduced, resulting in a decreased joint strength, with respect to tool rotation approach, equal to about 18%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-10-25 |