мелкозернистая структура, металлические конструкции, сварной шов, ручная дуговая сварка, устойчивость горения дугового разряда, механические свойства, качество металла, измельчение дендритов, импульсное воздействие, электромагнитное поле, металлографические исследования, макро и микроструктура образцов, феррит, дендрит, Nuclear engineering. Atomic power, TK9001-9401

The article presents the results of an experimental study of the effect of an additional pulse-quasi-harmonic voltage with a frequency of 40 kHz on the structure of welded joints, the technological properties of a DC arc discharge in manual arc welding with covered electrodes. Obtaining a fine-grained structure of a welded joint is one of the conditions for increasing its technological and strength properties, and the operational reliability of the manufactured product as a whole.