Earth-boring tools having particle-matrix composite bodies,...

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 9/028 (2006.01) B23K 9/04 (2006.01) B23K 9/23 (2006.01) B23K 9/235 (2006.01) B23K 26/28 (2006.01) B23K 26/34 (2006.01) B23K 26/42 (2006.01) B23P 6/00 (2006.01) E21B 10/46 (2006.01)

Patent

CA 2695520

Methods for welding a particle-matrix composite body (120) to another body (154) and repairing particle-matrix composite bodies (120) are disclosed. Additionally, earth-boring tools (110) having a joint that includes an overlapping root portion and a weld groove having a face portion with a first bevel portion and a second bevel portion are disclosed. In some embodiments, a particle-matrix bit body (120) of an earth-boring tool (100) may be repaired by removing a damaged portion, heating the particle-matrix composite bit body (120), and forming a built-up metallic structure thereon. In other embodiments, a particle-matrix composite body (120) may be welded to a metallic body (154) by forming a joint, heating the particle-matrix composite body (120), melting a metallic filler material forming a weld bead and cooling the welded particle-matrix composite body (120), metallic filler material and metallic body (154) at a controlled rate.

La présente invention concerne des procédés permettant de souder un corps composite de matrice de particules à un autre corps et de réparer des corps composites de matrice de particules. La présente invention décrit en outre des outils de forage du sol ayant un joint qui comprend une partie de base de chevauchement et un chanfrein ayant une partie de face dotée d'une première partie en biseau et une seconde partie en biseau. Dans certains modes de réalisation, un corps de trépan de matrice de particules d'un outil de forage du sol peut être réparé en retirant une partie endommagée, en chauffant le corps de trépan composite de matrice de particules, et en formant sur celui-ci une structure métallique montée. Dans d'autres modes de réalisation, un corps composite de matrice de particules peut être soudé à un corps métallique en formant un joint, en chauffant le corps composite de matrice de particules, en faisant fondre un métal d'apport formant un cordon de soudure et en refroidissant le corps composite de matrice de particules, le métal d'apport et le corps métallique soudés à une vitesse contrôlée.

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