EP 0912289 A1 19990506 - FRICTION WELDED DRILL ROD AND METHOD FOR MANUFACTURING THE ROD
Title (en)
FRICTION WELDED DRILL ROD AND METHOD FOR MANUFACTURING THE ROD
Title (de)
REIBGESCHWEISSTE BOHRSTANGE UND HERSTELLUNGSVERFAHREN
Title (fr)
TIGE DE FORAGE SOUDEE PAR FRICTION ET PROCEDE DE FABRICATION DE CETTE TIGE
Publication
Application
Priority
- SE 9701013 W 19970611
- SE 9602480 A 19960624
Abstract (en)
[origin: WO9749520A1] 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.
IPC 1-7
IPC 8 full level
B23K 20/12 (2006.01); B28D 1/14 (2006.01); C22C 38/00 (2006.01); C22C 38/50 (2006.01); E21B 17/00 (2006.01)
CPC (source: EP)
B23K 20/129 (2013.01); E21B 17/00 (2013.01); B23K 2101/06 (2018.08)
Citation (examination)
WO 9748516 A1 19971224 - SANDVIK AB [SE]
Designated contracting state (EPC)
AT DE FI FR GB IE SE
DOCDB simple family (publication)
WO 9749520 A1 19971231; AU 3280497 A 19980114; AU 716765 B2 20000309; BR 9709852 A 19990810; CA 2257488 A1 19971231; EP 0912289 A1 19990506; JP 2001502021 A 20010213; SE 507439 C2 19980608; SE 9602480 D0 19960624; SE 9602480 L 19971225; ZA 975283 B 19980105
DOCDB simple family (application)
SE 9701013 W 19970611; AU 3280497 A 19970611; BR 9709852 A 19970611; CA 2257488 A 19970611; EP 97928579 A 19970611; JP 50278098 A 19970611; SE 9602480 A 19960624; ZA 975283 A 19970613