The high-speed welding with low heat input of cylindrical parts

Authors

  • S.V. Shchetinin State Higher Education Institution "Priazovskyi state technical university", Mariupol, Ukraine
  • V.I. Shchetinina State Higher Education Institution "Priazovskyi state technical university", Mariupol, Ukraine
  • A.V. Koval State Higher Education Institution "Priazovskyi state technical university", Mariupol, Ukraine
  • P.V. Nikitenko State Higher Education Institution "Priazovskyi state technical university", Mariupol, Ukraine
  • Khaled Elsaed State Higher Education Institution "Priazovskyi state technical university", Mariupol, Ukraine

DOI:

https://doi.org/10.32782/2225-6733.43.2021.8

Keywords:

arc and liquid metal balance, energy minimum, process stability, electrode displacement from the zenith of the cylindrical part on the weld pool length, welding stresses, crack resistance, high-speed surfacing with low heat input

Abstract

At the electric arc surfacing of cylindrical parts, the weld pool is located on a curved surface, downward hydrodynamic pressure acts on the arc and the pool liquid metal, which leads to an imbalance in the pool, metal leakage from the pool, decrease in the process stability, decrease in deposited metal crack resistance and decrease in corrosion resistance. Therefore, the increase in crack resistance and in corrosion resistance is an important scientific-technical problem. The influence of current and voltage across the arc on the process stability and on the weld pool length, which increases with increasing current and voltage, that results in the process stability violation and in the leakage of liquid metal from the pool, has been established. With high-speed surfacing, the pool mass decreases, the process stability increases as well as the formation, deposited metal corrosion resistance and crack resistance. To increase the deposited metal crack resistance, it is necessary to ensure the arc and liquid metal balance by displacing the electrode from the zenith in the direction opposite to the part rotation on the weld pool length, which directs the hydrodynamic pressure towards the arc, increases the time before the pool reaches the curved surface, liquid metal crystallization in the absence of metal leakage. It has been established that with the surfacing rate increase and heat input decrease, liquid metal crystallization rate increases, while the mass and the weld pool lifetime decrease. The arc and liquid metal are in interaction. The arc deviates forward under the liquid metal action, the metal flows into the pool crater, and the balance and the process stability are established. Balance – energy minimum – quality maximum. The high-speed surfacing with low heat input of cylindrical parts with the electrode displacement from the zenith in the direction opposite to the detail rotation on the weld pool length a process, which ensures the process stability, the arc and the liquid metal pool balance, the liquid metal crystallization rate increase, the microstructure refinement, the interatomic distance decrease and the increase of interatomic bonds, of metal deposit crack resistance, of corrosion resistance and of wear resistance has been developed

Author Biographies

S.V. Shchetinin, State Higher Education Institution "Priazovskyi state technical university", Mariupol

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

V.I. Shchetinina, State Higher Education Institution "Priazovskyi state technical university", Mariupol

Доктор технічних наук, професор

A.V. Koval, State Higher Education Institution "Priazovskyi state technical university", Mariupol

Аспірант

P.V. Nikitenko, State Higher Education Institution "Priazovskyi state technical university", Mariupol

Аспірант

Khaled Elsaed , State Higher Education Institution "Priazovskyi state technical university", Mariupol

Аспірант

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Published

2021-12-30

How to Cite

Shchetinin, S. ., Shchetinina, V. ., Koval, A. ., Nikitenko, P. ., & Elsaed , K. (2021). The high-speed welding with low heat input of cylindrical parts. Reporter of the Priazovskyi State Technical University. Section: Technical Sciences, (43), 65–71. https://doi.org/10.32782/2225-6733.43.2021.8

Issue

No. 43 (2021): Reporter of the Priazovskyi State Technical University. Section: Technical sciences

Section

132 Materials Science

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