SE464136B - PROCEDURE FOR REMOVING PRESENT WELDING TENSIONS IN WELDED Pipes - Google Patents
PROCEDURE FOR REMOVING PRESENT WELDING TENSIONS IN WELDED PipesInfo
- Publication number
- SE464136B SE464136B SE8500844A SE8500844A SE464136B SE 464136 B SE464136 B SE 464136B SE 8500844 A SE8500844 A SE 8500844A SE 8500844 A SE8500844 A SE 8500844A SE 464136 B SE464136 B SE 464136B
- Authority
- SE
- Sweden
- Prior art keywords
- stresses
- base material
- casing
- procedure
- pipe
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
- C21D7/12—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars by expanding tubular bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
- B23P9/02—Treating or finishing by applying pressure, e.g. knurling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Glass Compositions (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
30 35 464 136 2 under förfarandet, varigenom således de potentiella skadliga effekterna av dessa dragspänningar elimineras. 46 35 464 136 2 during the process, thus eliminating the potential detrimental effects of these tensile stresses.
Uppfinningen hänför sig således till ett förfarande för av- lägsnande av återstående svetsspänningar i svetsgodset, det svetspåverkade grundmaterialet och det angränsande grundmate- 9 rialet i höljen och rör för inhíberíng av korrosionssprick- bildning, vilket kännetecknas av att man mekaniskt inför tryckspänningar i svetsgodset, det svetspåverkade grundmate- rialet och det angränsande grundmaterialet, vilka spänningar är högre än materialens individuella flytgränser, men ej över- stiger deras tryckbrottgränser, varvid tryckspänningarna infö- res med hjälp av delade ringar, vars inre ytor har en kontur, som passar till den yttre ytan på röret eller höljet, och mekaniska organ för att genom de delade ringarna åstadkomma en reglerad tryckdeformation på rörets eller höljets yttre yta, på sådant sätt att de ursprungliga dragspänningarna avlägsnas då tryckspänningarna därefter avlägsnas.The invention thus relates to a method for removing residual welding stresses in the weld metal, the welded base material and the adjacent base material in the casings and pipes for inhibiting corrosion cracking, which is characterized by mechanically introducing compressive stresses into the weld metal. welded base material and the adjacent base material, which stresses are higher than the individual yield strengths of the materials, but do not exceed their compressive strength limits, the compressive stresses being introduced by means of split rings, the inner surfaces of which have a contour corresponding to the outer surface on the pipe or casing, and mechanical means for producing a controlled pressure deformation on the outer surface of the pipe or casing through the split rings, in such a way that the original tensile stresses are removed when the compressive stresses are subsequently removed.
Tryckspänningarna enligt föreliggande förfarande överstiger, då de adderas till de ursprungliga svetsspänningarna, flyt- gränsen för materialet i svetsgodset, det svetspåverkade grundmaterialet och det angränsande grundmaterialet. Detta re- sulterar i en permanent plastisk flytning för materialet, där spänningarna överstiger flytgränserna. Då processpänningarna därefter avlägsnas minskas de ursprungliga återstående drag- spänningarna.The compressive stresses according to the present method, when added to the original welding stresses, exceed the yield strength of the material in the weld metal, the welded base material and the adjacent base material. This results in a permanent plastic flow for the material, where the stresses exceed the yield strengths. When the process stresses are subsequently removed, the original remaining tensile stresses are reduced.
De mekaniska medel, som användes för åstadkommande av ovan be- skrivna resultat är delade ringar, vars inre yta har en kon- tur, som passar till den yttre ytan på röret eller höljet, och organ för att genom de delade ringarna åstadkomma en reglerad tryckdeformation på röret eller höljets yttre yta. Ett organ för reglering av den perifera tryckdeformationen längs med rö- ” rets eller höljets längd kan erhållas genom att förse angrän- sande ändar hos de delade ringarna med i linje med varandra liggande öppningar och en bult anordnad i dessa öppningar.The mechanical means used to achieve the above-described results are split rings, the inner surface of which has a contour corresponding to the outer surface of the tube or casing, and means for producing a controlled pressure deformation through the split rings. on the outer surface of the tube or casing. A means for regulating the peripheral pressure deformation along the length of the pipe or casing can be obtained by providing adjacent ends of the divided rings with aligned openings and a bolt arranged in these openings.
Lämpligen bestämmes storleken på det ursprungliga gapet mellan 10 464 136 angränsande ändar hos de delande ringarna genom införande av mellanlägg däremellan. Ett organ för reglering av den önskade axiella tryckdeformationen kan erhållas genom användning av två par av delade ringar, varvid de angränsande ändarna hos vardera av paren av ringar har i linje liggande öppningar och bultar anordnade i vardera av öppningarna.Suitably, the size of the original gap between 10 464 136 adjacent ends of the dividing rings is determined by inserting spacers therebetween. A means for controlling the desired axial pressure deformation can be obtained by using two pairs of split rings, the adjacent ends of each of the pairs of rings having aligned openings and bolts arranged in each of the openings.
Naturligtvis är många modifikationer och variationer av den ovan beskrivna uppfinningen möjliga inom ramen för uppfinning- en och uppfinningen begränsas därför endast av vad som anges i följande patentkrav.Of course, many modifications and variations of the invention described above are possible within the scope of the invention and the invention is therefore limited only by what is stated in the following claims.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58261784A | 1984-02-22 | 1984-02-22 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE8500844D0 SE8500844D0 (en) | 1985-02-21 |
| SE8500844L SE8500844L (en) | 1985-08-23 |
| SE464136B true SE464136B (en) | 1991-03-11 |
Family
ID=24329836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8500844A SE464136B (en) | 1984-02-22 | 1985-02-21 | PROCEDURE FOR REMOVING PRESENT WELDING TENSIONS IN WELDED Pipes |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS60248814A (en) |
| CH (1) | CH665655A5 (en) |
| DE (1) | DE3436445A1 (en) |
| ES (1) | ES8605408A1 (en) |
| FI (1) | FI77590C (en) |
| FR (1) | FR2559697B1 (en) |
| GB (1) | GB2154492B (en) |
| IT (1) | IT1199204B (en) |
| MX (1) | MX172237B (en) |
| NL (1) | NL8403010A (en) |
| SE (1) | SE464136B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5278878A (en) * | 1992-11-13 | 1994-01-11 | Porowski Jan S | Process for reducing tensile welding stresses in a nozzle in a nuclear reactor shell |
| FR2744657B1 (en) * | 1996-02-08 | 1998-03-06 | Lorraine Laminage | METHOD FOR PRODUCING A WHEEL FOR A MOTOR LAND VEHICLE |
| CN100406190C (en) * | 2001-11-02 | 2008-07-30 | 波音公司 | Apparatus and method for forming weld joints having compressive residual stress patterns |
| US20060283919A1 (en) * | 2005-06-15 | 2006-12-21 | General Electric Company | Systematic cold working of welds |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR867197A (en) * | 1939-09-07 | 1941-10-03 | Budd Edward G Mfg Co | Improvements made to welding and products obtained |
| GB1000133A (en) * | 1961-03-30 | 1965-08-04 | Avesta Jernverks Ab | A method in the manufacture of welded pressure vessels |
| GB1097571A (en) * | 1965-03-01 | 1968-01-03 | Atomic Energy Authority Uk | Improvements in or relating to tubes |
| GB1235106A (en) * | 1967-06-22 | 1971-06-09 | Int Research & Dev Co Ltd | Improvements in and relating to methods of treating welds to improve their mechanical properties |
| BE734821A (en) * | 1968-07-02 | 1969-12-19 | ||
| YU44093B (en) * | 1979-01-26 | 1990-02-28 | Energoinvest Sarajevo | Method of treating connections obtained by explosive welding |
| CA1131104A (en) * | 1979-04-25 | 1982-09-07 | United States Of America (Government Of The) United States Department Of Energy | Process for treating weldments |
| GB2071552A (en) * | 1980-02-29 | 1981-09-23 | Secr Defence | The Treatment of Metals |
| JPS57145922A (en) * | 1981-03-04 | 1982-09-09 | Mitsubishi Heavy Ind Ltd | Improvement of residual stress in pipe or pipe-like vessel |
| JPS58120722A (en) * | 1982-01-11 | 1983-07-18 | Mitsubishi Heavy Ind Ltd | Improving method for residual stress of pipe or pipe-like vessel |
-
1984
- 1984-10-03 IT IT48943/84A patent/IT1199204B/en active
- 1984-10-03 GB GB08424990A patent/GB2154492B/en not_active Expired
- 1984-10-03 NL NL8403010A patent/NL8403010A/en not_active Application Discontinuation
- 1984-10-03 FI FI843893A patent/FI77590C/en not_active IP Right Cessation
- 1984-10-03 MX MX202940A patent/MX172237B/en unknown
- 1984-10-03 ES ES536480A patent/ES8605408A1/en not_active Expired
- 1984-10-04 DE DE19843436445 patent/DE3436445A1/en not_active Ceased
-
1985
- 1985-02-20 CH CH778/85A patent/CH665655A5/en not_active IP Right Cessation
- 1985-02-21 JP JP60033613A patent/JPS60248814A/en active Pending
- 1985-02-21 SE SE8500844A patent/SE464136B/en not_active IP Right Cessation
- 1985-02-21 FR FR8502495A patent/FR2559697B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES8605408A1 (en) | 1986-03-16 |
| FR2559697A1 (en) | 1985-08-23 |
| ES536480A0 (en) | 1986-03-16 |
| FR2559697B1 (en) | 1993-04-23 |
| FI77590B (en) | 1988-12-30 |
| FI77590C (en) | 1989-04-10 |
| GB2154492B (en) | 1987-12-02 |
| JPS60248814A (en) | 1985-12-09 |
| MX172237B (en) | 1993-12-08 |
| SE8500844D0 (en) | 1985-02-21 |
| CH665655A5 (en) | 1988-05-31 |
| IT8448943A0 (en) | 1984-10-03 |
| GB8424990D0 (en) | 1984-11-07 |
| IT1199204B (en) | 1988-12-30 |
| GB2154492A (en) | 1985-09-11 |
| FI843893L (en) | 1985-08-23 |
| DE3436445A1 (en) | 1985-08-22 |
| FI843893A0 (en) | 1984-10-03 |
| SE8500844L (en) | 1985-08-23 |
| NL8403010A (en) | 1985-09-16 |
| IT8448943A1 (en) | 1986-04-03 |
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| Date | Code | Title | Description |
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| NAL | Patent in force |
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| NUG | Patent has lapsed |
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