Abstract
An analysis of current research results shows that specific changes in the deposited metal microstructure are already observed at the periodical impact of 2.5 Hz frequency on it. However, most current research concerns oscillations from the frequency series, which is much higher than 10 Hz, while the oscillation amplitude values are in the range from tens of microns to 2 mm. This circumstance led to the performance of studies on the influence of mechanical harmonic oscillations of the weld pool with a frequency range from 2.5 to 4.5 Hz at the amplitude of 3–7 mm on the weld pool and the HAZ metal. The specimens for investigations were obtained by the GMAW surfacing process in the condition of weld pool oscillations. Treatment of data was conducted by the least squares regression analysis method to plot polynomials.

Key words
weld pool oscillations, deposited metal hardness

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