Shoulder Related Temperature Thresholds in FSSW of Aluminium Alloys
| Autor: | Carlos Leitão, D.G. Andrade, S. Sree Sabari, Dulce Maria Rodrigues |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science chemistry.chemical_element FSSW 02 engineering and technology Process variable Welding Article law.invention 0203 mechanical engineering Aluminium law aluminium alloys Aluminium alloy General Materials Science Composite material Spot welding Microscopy QC120-168.85 Temperature control QH201-278.5 Temperature temperature Rotational speed Aluminium alloys 021001 nanoscience & nanotechnology Engineering (General). Civil engineering (General) TK1-9971 020303 mechanical engineering & transports chemistry Descriptive and experimental mechanics visual_art Heat generation visual_art.visual_art_medium Electrical engineering. Electronics. Nuclear engineering TA1-2040 0210 nano-technology |
| Zdroj: | Materials Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Materials, Vol 14, Iss 4375, p 4375 (2021) Volume 14 Issue 16 |
| ISSN: | 1996-1944 |
| Popis: | Friction Stir Spot Welding (FSSW) is assumed as an environment-friendly technique, suitable for the spot welding of several materials. Nevertheless, it is consensual that the temperature control during the process is not feasible, since the exact heat generation mechanisms are still unknown. In current work, the heat generation in FSSW of aluminium alloys, was assessed by producing bead-on-plate spot welds using pinless tools. Coated and uncoated tools, with varied diameters and rotational speeds, were tested. Heat treatable (AA2017, AA6082 and AA7075) and non-heat treatable (AA5083) aluminium alloys were welded to assess any possible influence of the base material properties on heat generation. A parametric analysis enabled to establish a relationship between the process parameters and the heat generation. It was found that for rotational speeds higher than 600 rpm, the main process parameter governing the heat generation is the tool diameter. For each tool diameter, a threshold in the welding temperature was identified, which is independent of the rotational speed and of the aluminium alloy being welded. It is demonstrated that, for aluminium alloys, the temperature in FSSW may be controlled using a suitable combination of rotational speed and tool dimensions. The temperature evolution with process parameters was modelled and the model predictions were found to fit satisfactorily the experimental results. |
| Databáze: | OpenAIRE |
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