SE8502646L - PROCEDURE AND DEVICE FOR RELEASE OF REMOVAL VOLTAGES OF WELDING IN PIPELINES - Google Patents
PROCEDURE AND DEVICE FOR RELEASE OF REMOVAL VOLTAGES OF WELDING IN PIPELINESInfo
- Publication number
- SE8502646L SE8502646L SE8502646A SE8502646A SE8502646L SE 8502646 L SE8502646 L SE 8502646L SE 8502646 A SE8502646 A SE 8502646A SE 8502646 A SE8502646 A SE 8502646A SE 8502646 L SE8502646 L SE 8502646L
- Authority
- SE
- Sweden
- Prior art keywords
- zone
- weld zone
- pieces
- weld
- interval
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
PURPOSE:To prevent generation of an intergranular stress corrosion crack owing to tensile stress by attaching plural inductor pieces which are made into halved construction and have different diameters to the outside circumference in the weld zone of pipes, conducting electricity thereto and adjusting freely the number and interval of the inductors thereby heating uniformly and inductively the weld heat affected zone. CONSTITUTION:The residual tensile stress in the weld zone 1 of a small-diameter pipe 1A and a large-diameter pipe 1B in piping of a nuclear power plant, etc. is improved to compressive stress to prevent generation of the intergranular stress corrosion cracking in the weld zone 1 by the high-temp. and high-pressure water passing through the inside. Inductor pieces 21, 22, 23, 24 meeting the diameters of the pipes 1A, 1B are formed respectively into halved shapes and are attached to mounting frames 41, 42 so as to enclose the outside circumferential part before and behind the weld zone for the above-mentioned purpose. High-frequency current is passed to said pieces to heat uniformly the parts before and behind the weld zone 1 including said zone by the resistance heat generated by the induction current. Since the inductor pieces can be attached to the mounting frames at the varied interval and number, the weld zone 1 and the heat affected zone thereof are uniformly heated by the simple control of the interval and number, by which the residual tensile stress is relieved and is changed to compressive stress.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5341084A JPS60197823A (en) | 1984-03-22 | 1984-03-22 | Method and device for heating for improving residual stress in welded joint part of piping |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE8502646D0 SE8502646D0 (en) | 1985-05-29 |
| SE8502646L true SE8502646L (en) | 1986-11-30 |
| SE454183B SE454183B (en) | 1988-04-11 |
Family
ID=12942052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8502646A SE454183B (en) | 1984-03-22 | 1985-05-29 | HEAT TREATMENT DEVICE FOR RELEASE OF REMAINABLE VOLTAGES IN A WELDING UNIT IN A PIPE PIPE |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS60197823A (en) |
| DE (1) | DE3519467A1 (en) |
| SE (1) | SE454183B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60255930A (en) * | 1984-05-31 | 1985-12-17 | Dai Ichi High Frequency Co Ltd | Heating method and apparatus for improving residual stress in welded part of branched pipe |
| JPH0826413B2 (en) * | 1986-10-15 | 1996-03-13 | 株式会社日立製作所 | High frequency induction heating method and apparatus |
| FR2678195A1 (en) * | 1991-06-26 | 1992-12-31 | Siderurgie Fse Inst Rech | Method of inductively treating metal, especially steel, workpieces which are cracked or liable to be so |
| WO2009055758A2 (en) * | 2007-10-27 | 2009-04-30 | Radyne Corporation | Electric induction brazing in an inert atmosphere |
| DE102011013094A1 (en) * | 2011-03-04 | 2012-09-06 | Rwe Technology Gmbh | Process for the heat treatment of welds on power plant and plant components |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS589786A (en) * | 1981-07-08 | 1983-01-20 | Hitachi Ltd | High frequency induction heating coil wound on joint of piping |
-
1984
- 1984-03-22 JP JP5341084A patent/JPS60197823A/en active Granted
-
1985
- 1985-05-29 SE SE8502646A patent/SE454183B/en not_active IP Right Cessation
- 1985-05-31 DE DE19853519467 patent/DE3519467A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH046770B2 (en) | 1992-02-06 |
| SE8502646D0 (en) | 1985-05-29 |
| SE454183B (en) | 1988-04-11 |
| DE3519467C2 (en) | 1987-08-06 |
| JPS60197823A (en) | 1985-10-07 |
| DE3519467A1 (en) | 1986-12-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
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