TY JOUR TI ENSURING THE SAFETY OF WELDED JOINTS OF OIL AND GAS EQUIPMENT HOUSINGS BY ULTRASONIC SHOCK TREATMENT KW hardness KW oil and gas equipment housing KW welded joint KW thermal influence zone KW ultrasonic shock treatment KW residual stresses KW fire safety JO Problems of risk management in the technosphere AU Andryushkin, A.Y. AU Rustamova, M.U. AU Kadochnikova, E.N. PY 2023 IS 2023 PB Saint-Petersburg University of State Fire Service of Emercom of Russia