2014
EMSS 2014 Proceeding
Tool profiles evaluation based on vibroacoustical signals generated by friction-stir welding
Authors: Julio Blanco-Fernández, Emilio Jiménez-Macías, Mario Sanchez-Orozco, Angel Sanchez-Roca, Hipolito Carvajal-Fals
Abstract
This paper presents a study to assess the relationship between the tool design and vibro-acoustic signals of the friction stir welding process in the aluminium AA1050. The characterization in time and frequency domains (Martinez-de-Pison et al., 2012) of vibro- acoustical signal and the statistical analysis have been carried out in order to correlate them with the design of two different tools (Jimenez-Macias et al., 2010). Vibro-acoustical signals have been filtered in order to eliminate the noise of the friction stir welding machine. Additionally, the Wavelet Transform has been used as an efficient tool for filtering vibration signal waveforms. The statistical analysis has confirmed that the vibro-acoustical signals were significantly affected by the tool design. It was found that there is valid information to assess changes in the tool profile in the frequency range of 0 to 100Hz. Analysis techniques based on the Wavelet Transform constitute a tool that can be efficiently used in the assessment of changes in the tool profile.
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