The Paton Welding Journal, 2013, №08



2013 №08 (08)

2013 №08 (10)

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The Paton Welding Journal, 2013, #8, 49-53 pages  

PECULIARITIES OF INDUCTION BRAZING OF DIAMOND-HARD ALLOY CUTTERS TO BLADE OF BODY OF COMPLEX DRILL BIT

B.V. STEFANIV

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
It is determined that application of existing technology for brazing of diamond-hard alloy plates (DHP) and hard alloy holder to bit blade does not provide necessary quality of parts due to overheating of brazed-in cutter in brazing of the next one that results in overheating of following diamond-hard alloy cutter (DHC) and degradation of diamond layer owing to graphitization. Different heat sources of bit blades for brazing were analyzed. Technology of induction brazing of DHC to drill bit blade providing necessary characteristics of diamond layer of DHC as a cutting tool was developed. Manufacturing process of induction brazing of DHC to drill bit blade allowing brazing of DHC to blade without overheating of its diamond layer and preserving its high level service characteristics was designed. It is shown that proposed technology of induction brazing of DHC to bit blade allows using brazing filler materials with brazing temperature not more that 680-700 °C without loose of this layer serviceability. Brazing filler materials of standard origin and developed at the E.O. Paton Electric Welding Institute of the NAS of Ukraine were tested in process of investigations. A conclusion that brazing filler materials of Ag-Cu-Zn-Ni-Mn and Ag-Cu-Zn-Sn-Ni-Mn systems are the most perspective for induction brazing of DHC to blade was made based on results of generalization of test complex. Technology of welding of blades to body of drill bit was developed which allows reducing spattering of electrode metal on diamond layer of DHC and improving weld formation. This technology of brazing of DHC to blades of body of complex drill bit was applied in full-size products and tested under real service conditions during on-land drilling of gas wells. 6 Ref., 1 Table, 5 Figures.
 
 
Keywords: induction brazing, superhard materials, diamond-hard alloy cutter, diamond-hard alloy plate, hard alloy holder, bit, heat resistance, brazing filler material
 
 
Received:                24.05.13
Published:               28.08.13
 
 
References
1. Paton, B.E., Stefaniv, B.V., Khorunov, V.F. et al. Diamond drill bit. Pat. 92268 Ukraine. Int. Cl. E21B 10/46 E21B 10/54. Fil. 05.05.2009; Publ. 11.10.2010.
2. Paton, B.E., Stefaniv, B.V., Khorunov, V.F. et al. Calibrator. Pat. 92820 Ukraine. Int. Cl. E21B 10/26 E21B 7/28. Fil. 10.03.2009. Publ. 10.12.2010.
3. Glukhanov, N.P. (1989) Physical principles of high-frequency heating. Ed. by A.N. Shamov. Leningrad: Mashinostroenie.
4. Stefaniv, B.V. (2013) Development of the technology of brazing diamond-hard alloy cutters. The Paton Welding J., 2, 37-41.
5. Svetsinsky, V.G., Rimsky, S.T., Galinich, V.I. (1994) Welding of steels in shielding gas mixtures on argon base in industry of Ukraine. Avtomatich. Svarka, 4, 41-44.
6. Khorunov, V.F., Maksimova, S.V., Stefaniv, B.V. (2012) Effect of palladium on structure and technological properties of Ag-Cu-Zn-Ni-Mn system brazing filler alloys. The Paton Welding J., 9, 20-25.

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