Browsing by Author "Mineiro, Nuno"
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- Optimization of robotized welding in aluminum alloys with pulsed transfer mode using the Taguchi methodPublication . Izeda, António Eduardo Cruz; Pascoal, Arlindo; Simonato, Guilherme; Mineiro, Nuno; Gonçalves, José; Ribeiro, J.E.In order to obtain an optimal combination of welding parameters to weld an aluminum alloy (6082-T6) with MIG (Metal Inert Gas) it was used an L27 Taguchi orthogonal array. The array originated 27 different combinations that gives rise to 27 welding programs for the metal pulsed spray mode. The welds were made in aluminum bars using an industrial robot. All welds were repeated three times to ensure string repeatability. Metallographic tests were performed on the weld beads for measuring the width bead, penetration and reinforcement. Measurement data was analyzed for signal/noise and analysis of variance (ANOVA). Applying the Taguchi’s method, an optimal combination of welding parameters was reached.
- Projeto de automatização de processos de soldadura de estruturas hiperestáticas em ligas de alumínioPublication . Ribeiro, J.E.; Gonçalves, José; Mineiro, NunoNo âmbito do projeto Portugal2020 “APSEHAL: Automatização de Processos de Soldadura de Estruturas Hiperestáticas em Ligas de Alumínio", a Roboplan e o Instituto Politécnico de Bragança irão desenvolver a componente da seleção de materiais mais leves, e nesse sentido tem-se verificado uma substituição progressiva dos materiais metálicos clássicos como o aço ou o ferro fundido, com elevada resistência mecânica, mas muito densos por materiais com uma densidade inferior, sendo de destacar os compósitos , ligas de magnésio e ligas de alumínio. Estes materiais têm, para além da leveza, boas propriedades mecânicas e elevada resistência à corrosão atmosférica, daí a sua crescente utilização nos diferentes tipos de transporte.
- Robotic welding tests MIG standard and CMT+P in aluminum alloy 6082-T6 for optimization of penetration, cord width and reinforcementPublication . Pascoal, Arlindo; Izeda, António Eduardo Cruz; Vinícius Augusto Mantelo; Mineiro, Nuno; Gonçalves, José; Ribeiro, J.E.The present article describes an experimental analysis of a robotized Gas Metal-arc Welding (GMAW) in aluminum alloy, using Metal Inert Gas (MIG) in its transfer method variation Standard and pulsed Cold Metal Transfer (CMT+P), developed in order to optimize the penetration depth, width and reinforcement of the weld bead. The base metal was the aluminum alloy 6082-T6 and the filler metal was aluminum alloy 5754.
- Welding process automation of aluminum alloys for the transport industry: an industrial robotics approachPublication . Ribeiro, J.E.; Gonçalves, José; Mineiro, NunoThe materials used in the transport industry have been changing in the last decades. The traditional and heavy steel have been switching by the light alloys like aluminum alloys. However, despite their advantages as low density and high corrosion resistance, the manufacturing process, especially fusion welding, is very demanding and challenging. In the transport industry, most of the hyperstatic components made in aluminum alloys are welded manually with the associate financial costs as well as the lack of quality and repeatability. For these reasons, it is urgent to develop new methodologies to automate this process. The present work intends to show a scientific method to automate the welding process of hyperstatic frames, very common in bicycles, made in aluminum alloy. This methodology involves two steps, the first one in which is performed numerical simulations to determine the optimal welding parameters to minimize the distortion and residual stresses. The second step is experimental one, and it is created an automated welding cell with a robot to weld the frames. It has been proved that it is possible to obtain welding aluminum frames with acceptable quality in agreement with the ASME IX standard.