WO1997049520A1 - Friction welded drill rod and method for manufacturing the rod - Google Patents
Friction welded drill rod and method for manufacturing the rod Download PDFInfo
- Publication number
- WO1997049520A1 WO1997049520A1 PCT/SE1997/001013 SE9701013W WO9749520A1 WO 1997049520 A1 WO1997049520 A1 WO 1997049520A1 SE 9701013 W SE9701013 W SE 9701013W WO 9749520 A1 WO9749520 A1 WO 9749520A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- component
- rod
- friction
- weld
- components
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/129—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding specially adapted for particular articles or workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Definitions
- the present invention relates to a drill rod and a method for its manufacturing by friction welding.
- Conventional rods for rock drilling either have a thread machined directly in the rod or a thread machined in a rod end forged to a diameter bigger than the rod diameter. Instead of forging up the dimension of rods it is possible to friction weld end pieces or guiding pieces with diameters bigger than the rod diameter.
- Conventional rock drilling rods are most often manufactured from holed rods and adapters from solid rods. For threaded rods at least one thread is often machined in a bumped up (forged) end with a diameter bigger than the rod diameter while shank adapters often are machined from rounds.
- Another way is to compensate the weaker strength in the soft zones by bumping up the rod end before friction welding.
- the rods are threaded and a separate bit is mounted on the rod. That means that one rod can be used much longer than an integral since the rod instead of being discarded when the bit is worn out, it can be drilled further with a new bit mounted. Water flushing result in a risk for corrosion fatigue, especially since the water for example in mines often is acid and therefore extra corrosive.
- One object of the present invention is to provide a friction welded drill rod wherein the end piece(s) has (have) a unique resistance against corrosion fatigue in combination with that the heat affected zone of the weld is as strong as the rod itself.
- Another object of the present invention is to provide a friction welded drill rod having a high strength weld.
- Still another object of the present invention is to provide a low temperature heat treatment method for producing a corrosion fatigue resisting drill rod without softening the rod at the most load subjected parts of the rod, i.e. at the thread, the flushing hole of the end piece(s) and at the clearance between the thread and the rod body.
- Still another object of the present invention is to provide an effective method for producing drill rods combined from two or more pieces which are friction welded together without subsequent carburation or other high temperature heat treatment process.
- Fig. 1 shows an end of a threaded drill rod according to the present invention in a longitudinal cross-section.
- Fig. 2 shows a schematic Fe-C phase diagram of a material used in the drill rod according to the present invention.
- Fig. 3 shows the hardness variation, with a dotted curve, from the surface into the core after nitrocarburizing of a conventional rock drill steel (such as type SS2534) while the continuos curve in the same graph shows the hardness variation according to the present invention.
- Fig. 4A shows a core hardness distribution in the longitudinal direction of the nitrocarburized threaded end piece (to the right) and through the friction weld into the rod (left), the latter normally with no heat treatment after hot rolling of the rod.
- Fig 4B shows a steel weld according to the present invention in a longitudinal cross-section.
- Fig. 5 shows a continuous tempering curve for a steel suitable for the present invention, while the dotted curve describes an example of a tempering curve for a conventional steel for drill.
- the drill rod 10 for percussive drilling comprises a first component 25 comprising a threaded portion 1 1 connected to a clearance portion 12, which connects to a short rod portion 16.
- the threaded portion 1 1 forwardly connects to a striking surface 1 7.
- the first component 25 is connected to a second component 22, which preferably is a long rod portion 13.
- a flush channel 26 is provided centrally in the drill rod 10.
- the short rod portion 16 is of substantially the same diameter as the rod portion 13.
- the drill rod to be manufactured usually includes the stationary or non- rotatable component 25 and the rotatable component 22.
- the components 22,25 are made of steel and before friction welding starts, the steel at the mating end of each component is uniform in the core and is as such called parent material.
- nitrocarburized layer is designated the numeral 14 in Fig. 4B and its depth is about 0.3 mm.
- other types of low temperature surface heat treatments can be used, such as
- nitrocarburizing Blacknite etc.
- the steel to be heat treated by nitrocarburizing shall have high tempering resistance (hot hardness) and secondary hardening peak around the nitrocarburizing temperature (550-610°C, normally at 580°C) such that the core hardness does not fall below 440 HV1 (kg) (Vickers Hardness) and preferably not below 450HV and will thus give the nitrocarburized layer 14 a good support to withstand the impact loads from the shock waves during percussive drilling, see the continuos curve in Fig.3 and the continuos tempering curve in Fig. 4.
- a chuck means is opened and the threaded portion 25 is inserted therein.
- the chuck means is closed to grip the shank in an aligned position.
- clamp means is opened and the end of the drill rod 25 is inserted therein.
- the clamp means is closed to grip the rod in an aligned position.
- the drill bit starts to rotate and the clamp means feeds the free end of the rod towards and into contact with the free end of the bit.
- the heat produced during friction welding make abutting ends possible to forge.
- the relative rotation of the components is stopped and the components are pushed further together and cooled, as in Fig. 4B.
- the method of friction welding is more specifically described in SE-A-9502153-1 and is hereby incorporated by reference into the present description.
- a proper steel shall have higher hot hardness and a secondary hardening between 550-610°C.
- higher hot hardness is here meant that the steel used in connection with the present invention has a hot hardness about 200 HV1 at 600°C compared to a conventional steel wherein the hot hardness is about 100 HV1 at 600°C.
- the continuous tempering curve in Fig. 5 describes an example of secondary hardening range S for a steel suitable for the present invention, while the dotted curve describes an example of a tempering curve for a conventional steel for drill rods having a tempering time about an hour.
- the core hardness of the softest part of the HAZ in the drill rod according to the present invention is about (i.e. ⁇ 5%) equal to the hardness of the parent material.
- the components 22, 25 shall have a hardness in the HAZ that is comparable with the core hardness of the rod and normally higher than 400. For at least the component with the weakest cross-section the following shall be valid.
- the strength in the heat affected zone is comparable with that of the parent, not heat affected steel material.
- the hardness, shown by a line I in Fig. 4A, in the normally soft zone is at least at the same level as the normal core hardness in a conventional normalized drill rod, i.e. higher than 390 HV1 .
- the main elements, normally Cr, Mo and V are held at a level that gives a core hardness after nitrocarburizing of at least 440 HV1 and a HAZ hardness of at least 390 HV1.
- the steel type used in the threaded component 25 or in both components 22, 25 has a chemical composition which lies in the interval in weight-% of: 0.1 5-0.50 C; max. 0.1 5 Si; min 0.2 Mn; 0.5-1 .5 Cr; 0.5-4 Ni; 0.5-2 Mo; max. 0.5V; max. 0.5 W; 0.5 Ti; max. 0.1 Nb and max. 0.05 Al, the balance being Fe.
- An example of such a steel is 0.32 C; 0.9 Si; 1.0 Cr; 0.5 Ni; 1.0 Mo; 0.1 V, the balance being Fe.
- the method for producing a friction welded product for rock drilling comprises the steps of providing a parent material having a high hot hardness, heat treating the threaded portion 1 1 , the inner passage 26 and clearance portion 12 of the first component 25 against corrosion fatigue preferably by nitrocarburizing the first component 25 separately, providing clamp means for clamping the first component 25, providing rotation means for rotating the second component 22, putting free ends of the first and second components together and rotating the first and second components relative to each other so as to form a weld 27 and cooling the weld to room temperature thereby keeping the lowest core hardness of the heat affected zone above 390 HV1 .
- any of the components 22 and 25 may be stationary while the other component is rotatable during friction welding.
- the free ends of rotatable 22 and non-rotatable 25 components that are to be connected are free from joint preparation and have end surfaces substantially perpendicular to a rotational axis of the components.
- the main features of the present invention is to provide a drill rod wherein the risk of corrosion fatigue is decreased in the threaded portion 1 1 and in the clearance portion 12 by heat treating, preferably, nitrocarburizing the separate first component 25 and then friction weld the first component to a rod 13 that might be carburized, normalized, nitrocarburized etc.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU32804/97A AU716765B2 (en) | 1996-06-24 | 1997-06-11 | Friction welded drill rod and method for manufacturing the rod |
JP10502780A JP2001502021A (en) | 1996-06-24 | 1997-06-11 | Friction welded drill rod and method of manufacturing the rod |
CA002257488A CA2257488A1 (en) | 1996-06-24 | 1997-06-11 | Friction welded drill rod and method for manufacturing the rod |
BR9709852A BR9709852A (en) | 1996-06-24 | 1997-06-11 | Drill rod welded by friction and process for manufacturing the same |
EP97928579A EP0912289A1 (en) | 1996-06-24 | 1997-06-11 | Friction welded drill rod and method for manufacturing the rod |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602480A SE507439C2 (en) | 1996-06-24 | 1996-06-24 | Friction welded drill rod and method of manufacturing the drill rod |
SE9602480-7 | 1996-06-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997049520A1 true WO1997049520A1 (en) | 1997-12-31 |
Family
ID=20403125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1997/001013 WO1997049520A1 (en) | 1996-06-24 | 1997-06-11 | Friction welded drill rod and method for manufacturing the rod |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0912289A1 (en) |
JP (1) | JP2001502021A (en) |
AU (1) | AU716765B2 (en) |
BR (1) | BR9709852A (en) |
CA (1) | CA2257488A1 (en) |
SE (1) | SE507439C2 (en) |
WO (1) | WO1997049520A1 (en) |
ZA (1) | ZA975283B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003076761A1 (en) * | 2002-03-12 | 2003-09-18 | Sandvik Ab | Drill member for rock drilling and a method for manufacturing the drill member |
WO2004029403A1 (en) * | 2002-09-24 | 2004-04-08 | Sandvik Ab | Drill rod and method in order to manufacture the same |
WO2004101948A1 (en) * | 2003-05-16 | 2004-11-25 | Atlas Copco Secoroc Ab | A connection rod for rock drilling and a method of producing the same. |
CN103008871A (en) * | 2012-12-14 | 2013-04-03 | 中国石油集团长城钻探工程有限公司工程服务公司 | Friction welding process for novel bainite/martensite duplex-phase steel drill pipe |
EP2746419A1 (en) * | 2012-12-20 | 2014-06-25 | Sandvik Intellectual Property AB | Bainitic steel for rock drilling component |
CN110042319A (en) * | 2019-05-20 | 2019-07-23 | 广州广钢新材料股份有限公司 | A kind of low temperature screw-thread steel and its production technology |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008087003A (en) * | 2006-09-29 | 2008-04-17 | Toyota Motor Corp | Friction-welded member |
JP5523373B2 (en) | 2011-02-18 | 2014-06-18 | 三菱マテリアル株式会社 | Hollow steel rod for excavation and manufacturing method thereof |
JP6201534B2 (en) * | 2013-08-30 | 2017-09-27 | 大同特殊鋼株式会社 | Steel for carburized parts |
WO2023162502A1 (en) * | 2022-02-25 | 2023-08-31 | 国立大学法人大阪大学 | Solid-phase welding method and solid-phase welding joint |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4817852A (en) * | 1987-10-08 | 1989-04-04 | T. H. Industries | Method of replacing drill bit heads |
-
1996
- 1996-06-24 SE SE9602480A patent/SE507439C2/en not_active IP Right Cessation
-
1997
- 1997-06-11 JP JP10502780A patent/JP2001502021A/en active Pending
- 1997-06-11 BR BR9709852A patent/BR9709852A/en not_active IP Right Cessation
- 1997-06-11 AU AU32804/97A patent/AU716765B2/en not_active Ceased
- 1997-06-11 CA CA002257488A patent/CA2257488A1/en not_active Abandoned
- 1997-06-11 WO PCT/SE1997/001013 patent/WO1997049520A1/en not_active Application Discontinuation
- 1997-06-11 EP EP97928579A patent/EP0912289A1/en not_active Withdrawn
- 1997-06-13 ZA ZA9705283A patent/ZA975283B/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4817852A (en) * | 1987-10-08 | 1989-04-04 | T. H. Industries | Method of replacing drill bit heads |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003076761A1 (en) * | 2002-03-12 | 2003-09-18 | Sandvik Ab | Drill member for rock drilling and a method for manufacturing the drill member |
WO2004029403A1 (en) * | 2002-09-24 | 2004-04-08 | Sandvik Ab | Drill rod and method in order to manufacture the same |
US7571779B2 (en) | 2002-09-24 | 2009-08-11 | Sandvik Intellectual Property Aktiebolag | Drill rod and method of manufacture thereof |
KR101017873B1 (en) | 2002-09-24 | 2011-03-04 | 산드빅 인터렉츄얼 프로퍼티 에이비 | Drill rod and method in order to manufacture the same |
WO2004101948A1 (en) * | 2003-05-16 | 2004-11-25 | Atlas Copco Secoroc Ab | A connection rod for rock drilling and a method of producing the same. |
CN100432368C (en) * | 2003-05-16 | 2008-11-12 | 阿特拉斯·科普科塞科罗克股份公司 | Connection rod and method for production thereof |
CN103008871A (en) * | 2012-12-14 | 2013-04-03 | 中国石油集团长城钻探工程有限公司工程服务公司 | Friction welding process for novel bainite/martensite duplex-phase steel drill pipe |
EP2746419A1 (en) * | 2012-12-20 | 2014-06-25 | Sandvik Intellectual Property AB | Bainitic steel for rock drilling component |
WO2014095747A1 (en) * | 2012-12-20 | 2014-06-26 | Sandvik Intellectual Property Ab | Bainitic steel for rock drilling component |
AU2013363743B2 (en) * | 2012-12-20 | 2016-02-04 | Sandvik Intellectual Property Ab | Bainitic steel for rock drilling component |
CN110042319A (en) * | 2019-05-20 | 2019-07-23 | 广州广钢新材料股份有限公司 | A kind of low temperature screw-thread steel and its production technology |
Also Published As
Publication number | Publication date |
---|---|
SE507439C2 (en) | 1998-06-08 |
EP0912289A1 (en) | 1999-05-06 |
BR9709852A (en) | 1999-08-10 |
SE9602480L (en) | 1997-12-25 |
ZA975283B (en) | 1998-01-05 |
AU716765B2 (en) | 2000-03-09 |
JP2001502021A (en) | 2001-02-13 |
SE9602480D0 (en) | 1996-06-24 |
AU3280497A (en) | 1998-01-14 |
CA2257488A1 (en) | 1997-12-31 |
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