One-sided high-speed welding of pipes for gas and oil pipelines is limited by the violation of the back bead formation on the flux pad due to liquid metal leakage from the pool, by the violation of the process stability and the undercuts formation under the welding current magnetic field influence, and welded joints toughness decrease. Therefore, the development of one-sided high-speed welding of pipes for gas and oil pipelines that affords increase in stability, quality and impact strength of welded joints is an important scientific and technical problem. At one-sided high-speed welding using a composite electrode, the arc moves in the longitudinal and perpendicular to normal directions, the arc pressure is reduced by 4 times, the liquid metal crystallization rate increases, and the high-quality back bead seams on the flux pad are formed regardless of the gap in the joint; there being no metal leakage from the pool. The regulation of the arc movement along the electrode end and the weld pool provides heat input into the pool side edges, the increase of electrical resistance and the decrease of the current that flows through the side edges and the decrease of the magnetic field, as a result of which the downward magnetic pressure is reduced and the formation of undercuts is prevented; their nature being electromagnetic. One-sided high-speed welding provides the decrease in heat input and in welding stresses, the increase in crystallization rate, which is equal to the welding speed, the refinement of the microstructure, the reduction of interatomic distance, the increase in interatomic bonds and in welded joints toughness. One-sided high-speed welding of pipes for gas and oil pipelines by a composite electrode has been developed. This process, due to the arc movement along the electrode end and the weld pool, provides the arc pressure reduction and a back bead on a flux cushion high-quality formation, the decrease in magnetic pressure and the undercuts absence, provides the process stability, the reduction in heat input and welding stresses, provides the microstructure refinement and the increase in welded joints toughness by 2–2.5 times

Встановлені закономірності регулювання переміщення дуги по торцю електрода і ванні при зварюванні складовим електродом. Розроблено процес одностороннього високошвидкісного зварювання труб для газо- і нафтопровідних магістралей складовим електродом, що забезпечує за рахунок регулювання переміщення дуги по торцю електрода і зварювальній ванні, зниження тиску дуги і якісне формування зворотного валику на флюсовій подушці, зменшення магнітного поля, відсутність підрізів, стабільність процесу, зниження тепловкладення, зварних напруг, здрібнення мікроструктури і підвищення ударної в’язкості зварних з’єднань