TY JOUR TI Ultrasonic oscillation superposition during welding KW ultrasound KW oscillations KW cavitation KW welding KW weld seam JO Science intensive technologies in mechanical engineering AU Nigmetzyanov, R.I. AU Sundukov, S.K. AU Fatyukhin, D.S. PY 2020 IS 2020 PB Bryansk State Technical University