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Abstract

Aspects in Mining & Mineral Science

Efficiency of the Hardening of Drill Pipes (Rods)

  • Open or CloseTyurin YN*

    Institute of Electric Welding E O Paton, Ukraine

    *Corresponding author: Yu N Tyurin, Institute of Electric Welding E O Paton, NASU, Kiev, Ukraine

Submission: October 12, 2020; Published: July 22, 2021

DOI: 10.31031/AMMS.2021.07.000652

ISSN : 2578-0255
Volume7 Issue1

Abstract

Electrolyte-Plasma Thermo Cyclic Hardening (EPTCZ) is proposed, where an electric current is used, passed through a layer of plasma adjacent to the surface of the product. The technology creates a system of solid inclusions on the surface of products that reduce wear and ensure the formation of compressive stresses. The hardness of local areas on the surface of products made of 35HGSA steel is 50-55 HRC, 40X steel - 55-60 HRC, 65G steel - 60-68 HRC, 1...10mm thick. Experiments have shown that EPTSZ significantly reduces surface wear, increases bending resistance by 30...40%. The performance of the drill pipes (rods) after quenching has increased 2...3 times. The technology of creating local solid inclusions on the outer surface of drill pipes (rods) has been developed. Strengthening is carried out by an Electrolytic-Plasma Thermo Cyclic Quench (EPTCZ). The process of EPTCZ pipes is carried out on installations, (Figure 1) having a rotator-1, a tank with electrolyte-2, electrolyte heaters-3, an energy converter-4, and a control panel-5. The product (pipe) is fixed to the manipulator. An electrolyte heater is brought under the product, which is included in the electrical circuit as an anode. The product is a cathode. The electrolyte from the tank is pumped into the heater and closes the electric circuit between the electric electrode (mesh anode) and above the product through an electrolyte (aqueous solution of salt).

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