Method to increase the strength of an element for percussive...

B - Operations – Transporting – 21 – B

Patent

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77/28, 80/51

B21B 1/00 (2006.01) C21D 7/08 (2006.01) E21B 10/56 (2006.01)

Patent

CA 2009179

ABSTRACT OF THE DISCLOSURE An element to be used for percussive drilling to transmit impact energy in its axial direction is cold- worked along a surface thereof by being subjected to a deep rolling operation which creates a surface finish RA no greater than 1Ø

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