Friction welded drill rod and method for manufacturing the rod

E - Fixed Constructions – 21 – B

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Details

E21B 17/00 (2006.01) B23K 20/12 (2006.01) C22C 38/44 (2006.01)

Patent

CA 2257488

The present invention relates to a friction welded product for rock drilling, including a first component (25) and a second component (22) of parent material joined by a friction weld (27). The components have a central inner passage (26). Each component (22, 25) is heat treated at low temperature and is made from a steel having a chemical composition such that the core hardness after nitrocarburizing of the component (22, 25) is at least 440 HV1. The core hardness of the most tempered parts of the heat affected zone close to the weld (27) is about the same as for the core hardness of the rod when cooled to room temperature of at least 390 HV1. The first component (25) comprises a threaded portion (11) and a clearance portion (12) which are pretreated against corrosion fatigue preferably by nitrocarburizing the first component (25) separately and then friction welding it to the second component (22), such as a rod (13). The present invention further relates to a method for manufacturing a friction welded drill rod for rock drilling.

Cette invention se rapporte à un produit soudé par friction pour le forage de la roche, qui comprend un premier composant (25) et un second composant (22) en matériaux parents joints par une soudure par friction (27). Ces composés présentent un passage interne central (26) et chacun de ces composés (22, 25) est traité thermiquement à basse température et est fabriqué à partir d'un acier ayant une composition chimique telle que la dureté de noyau après nitrocarburation du composant (22, 25) est au moins égale à 440 HV1. La dureté de noyau des parties les plus trempées de la zone affectée thermiquement proche de la soudure (27) est à peu près la même que la dureté de noyau de la tige lorsque celle-ci est refroidie à température ambiante, c'est-à-dire d'au moins 390 HV1. Le premier composant (25) comprend une partie filetée (11) et une partie évidée (12), que l'on soumet à un prétraitement contre la fatigue par corrosion, de préférence en nitrocarburant le premier composant (25) séparément et, ensuite, en soudant par friction ce premier composant au second composant (22), lequel est constitué par exemple par une tige (13). Cette invention se rapporte en outre à un procédé de fabrication d'une tige de forage soudée par friction pour le forage de la roche.

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