00503naa#a2200181#i#450# EN\\bibl\12240 20241120034808.3 1992-5980 20160621b2016####ek#y0engy0150####ca RUS RU Main pipeline repair by steel welding sockets Journal article rostov on don Don state technical University 2016 6 с. Journal article local Lukyanov Vitaliy Lukyanov Anton zh-szf.ru