Welding current magnetic field regulation at high-speed one-sided welding of the pipes for gas and oil pipelines

S V Shchetinin,Elsaed Khaled,P V Nikitenko

doi:10.31498/2225-6733.39.2019.201052

S V Shchetinin, Elsaed Khaled + Show 1 more

Open Access

https://doi.org/10.31498/2225-6733.39.2019.201052

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Abstract

One-sided high-speed pipe welding for gas and oil pipelines is an energy and material saving process, the use of which is restricted by the magnetic blow and the violation of the external and internal welds formation. Therefore, the development of the one-sided high-speed pipe welding for gas and oil pipelines process, which ensures the magnetic blow prevention, stability, improving the welded joints quality and toughness, is an important scientific and technical problem. According to the magnetism quantum theory, any system with the help of radiation or another method always comes to the lowest or principal state, with an eigen value of energy equal to E0. It has been established that the magnetic blow is the result of the minimum energy law, according to which the arc deviates to the side of a lower magnetic field until the break, as a result of which the process stability and the welds formation quality are violated. When welding pipes for gas and oil pipelines, the magnetic blow increases significantly due to of the magnetic field lines concentration in the ferromagnetic pipe with high magnetic permeability, which results in increased magnetic blow and the violation of both the process stability and the welds formation. To prevent the magnetic blow, welding pipes with two-sided current supply and regulating the welding current magnetic field process by passing current in front and behind the arc has been developed, which ensures the arc equilibrium, reducing the magnetic field energy to zero, stability and improving of the welded joints quality. Оne-sided high-speed welding pipes for gas and oil pipelines method with two-sided current supply and the welding current magnetic field regulation by transmitting current behind and in front of the arc in a ratio I1/I2 = 1,7-1,9, that ensures the magnetic blow prevention, arc balance, process stability, fine-grained microstructure, the welded joints quality and impact strength improving has been developed

Highlights

Onesided high-speed pipe welding for gas and oil pipelines is an energy and material saving process, the use of which is restricted by the magnetic blow and the violation of the external and internal welds formation
It has been established that the magnetic blow is the result of the minimum energy law, according to which the arc deviates to the side of a lower magnetic field until the break, as a result of which the process stability and the welds formation quality are violated
When welding pipes for gas and oil pipelines, the magnetic blow increases significantly due to of the magnetic field lines concentration in the ferromagnetic pipe with high magnetic permeability, which results in increased magnetic blow and the violation of both the process stability and the welds formation

Summary

Introduction

Оnesided high-speed welding pipes for gas and oil pipelines method with two-sided current supply and the welding current magnetic field regulation by transmitting current behind and in front of the arc in a ratio I1/I2 = 1,7-1,9, that ensures the magnetic blow prevention, arc balance, process stability, fine-grained microstructure, the welded joints quality and impact strength improving has been developed. Магнітне поле зварювального струму в значній мірі визначає стабільність процесу і формування швів при односторонньому високошвидкісному зварюванні труб для газо- і нафтопровідних магістралей.

Results

Conclusion