The article presents the research results on acoustic emission (AE) generated by process of friction stir welding of sheets made of dissimilar aluminium alloys (AW-5083 and AW-7020). Nowadays acoustic emission method is used in many fields of science, including in the diagnosis of machining and joining processes such as turning, grinding, milling, welding, etc.Friction Stir Welding (FSW) – a new technology can be successfully used for butt welding of different types of aluminium alloy sheets. FSW method can be an alternative to traditional arc welding methods i.e. MIG or TIG. The joining process was carried out on laboratory stand built on the basis of universal milling machine FWA-31. Joining parameters chosen after optimization of the FSW process were presented.The research was carried out on a laboratory test stand using an acoustic emission set made by Vallen System. This set included: 4 channel signal recorder AMSY 6, two measurement modules ASIP-2/S, preamplifier with a frequency range 20 kHz - 1 MHz and the strengthening of 34dB and AE signal measurement sensor type VS 150M, with a frequency range 100 – 450 kHz. During the study, the acoustic emission (AE) generated by rotating tool and friction between joining materials and tool surface was recorded. The following parameters were determined: amplitude, number of events - hits, the effective value of the signal (RMS).The study can be the basis for the use of acoustic emission method to monitor the process and determine the parameters of the friction stir welding for obtaining a high quality joint.Keywords: Acoustic Emission, friction stir welding (FSW), aluminium alloys, joining, welding parameters
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