OBRABOTKAMETALLOV TECHNOLOGY Vol. 24 No. 2 2022 Ta b l e 3 Equipment and welding modes Welding conditions Material St3 AMg4 Welding unit type MIG 235 MIG 215AL PULSE Welding current Iweld, A 60 125 Electrical polarity reversed reversed Voltage Uweld, V 28 22 Wire speed, Vwire m/min 1.9 15.2 Shielding gas CO2 Ar Shielding gas fl ow, l/min 8 17.5 Welding time, s 12 2 Fig. 1. Design of experiment: 1 – plate; 2 – weld; 3 – welding torch; 4 – bolt; 5 – waveguide; 6 – magnetostrictive transducer One of the most important aspects in welding with superimposed vibrations is to determine the place of its application to the plate and also the place of welding, where a stable ultrasonic effect is ensured. Determination of vibration application and weld passing spots when using AMg4 According to the applied design of ultrasonic vibration application, the vibration system is a source of bending vibrations in the case of its normally oriented location. In terms of process application, the optimal spot to apply vibrations will be one of the antinodes of the own vibrations of the plate. In this case, the resonance frequencies of the vibration system and the plate should be aligned. Since a commercially available ultrasonic vibration system having a certain resonance frequency f is used in this research, the calculation is done based on the need to ensure the equal resonance frequency fp of the plate.
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