SU615141A1 - Method of heat treatment of welded hollow articles - Google Patents
Method of heat treatment of welded hollow articlesInfo
- Publication number
- SU615141A1 SU615141A1 SU742059978A SU2059978A SU615141A1 SU 615141 A1 SU615141 A1 SU 615141A1 SU 742059978 A SU742059978 A SU 742059978A SU 2059978 A SU2059978 A SU 2059978A SU 615141 A1 SU615141 A1 SU 615141A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- welded
- heat treatment
- temperature
- product
- welding
- Prior art date
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- Heat Treatment Of Articles (AREA)
Description
II
Изобретение относитс к области термической обработки сварных полых изделий.The invention relates to the field of heat treatment of welded hollow articles.
Известны способы термической обработки сварных изделий, включающие объемный отпуск издели 1 и местный нагрев сварного шва и наружной поверхности полого издели до температуры, превышающей температуру внутренней поверхности (2).Known methods of heat treatment of welded products, including volumetric tempering product 1 and local heating of the weld and the outer surface of the hollow product to a temperature above the temperature of the inner surface (2).
Известен также способ термической обработки сварных полых изделий, включающий охлаждение после сварки, местный по-, догрев сварной зоны и объемную термическую обработку издели (3). Его применение св зано с относительным перегревом наружной поверхности издели , привод щим ктрещинообразованию .Also known is a method of heat treatment of welded hollow products, including cooling after welding, local, after heating the welded zone and volumetric heat treatment of the product (3). Its use is associated with relative overheating of the outer surface of the product, leading to cracking.
Цель описываемого способа - предотвращение по влени трещин.The purpose of the described method is to prevent the occurrence of cracks.
Эта цель достигаетс тем, что изделие после сварки охлаждают до температуры наружной поверхности сварной зоны 100- 200°С, после чего сварную зону подогревают изнутри до температуры внутренней поверхности на 50- 150°С превышающей температуру наружной поверхности.This goal is achieved by the fact that after welding the product is cooled to the outer surface temperature of the welded zone 100-200 ° C, after which the welded zone is heated from the inside to the inner surface temperature 50-150 ° C higher than the outer surface temperature.
Применительно к термической обработке из стали 20ХМНФ сваренного днища и обечайки с толщиной стенки 450 мм и-наружнымIn relation to heat treatment of steel 20HMNF welded bottom and shell with a wall thickness of 450 mm and-outer
диаметром 3500 мм описываемый способ осуществл етс следующим образом. По окончании электрошлак 5вой сварки наружна и внутренн новерхность имеют примерно одинаковую температуру в пределах 150- 200°С. При этой температуре в полость цилиндра ввод т газовые горелки, плам которых направлено на сварную зону, и производ т нагрев, в течение 2-4 ч при вращении цилиндра, В результате температура внутренней поверхности сварной зоны растет до 250-ЗОО С, а наружной до 100- 20бС, пр чем разница температур составл ет 50-150°С. Затем цилиндр помещают в нагретую до 300-3 С термическую печь дл прохождени объемной термообработки: и а грев до 640-6бО°С со скоростью не более , выравнивание температуры, по сечению, выдержка при 640-ббО С в течение 40 ч. охлаждение до 400°С со скоростью не более , а до 100°С - со скоростью не более J5°C/4.3500 mm in diameter, the described method is carried out as follows. At the end of electroslag welding, the outer and inner surfaces have approximately the same temperature in the range of 150-200 ° C. At this temperature, gas burners are introduced into the cavity of the cylinder, the flames of which are directed to the welded zone, and are heated for 2-4 hours as the cylinder rotates. As a result, the temperature of the inner surface of the welded zone rises to 250 ° C ZOO and 100-20 ° C; the difference in temperature is 50-150 ° C. Then the cylinder is placed in a thermal furnace heated to 300–3 ° C to undergo a volume heat treatment: and heating to 640–6bO ° C at a rate of no more than equalizing the temperature, cross section, holding at 640 bbO C for 40 h. Cooling to 400 ° С with a speed of not more than, and up to 100 ° С - with a speed of no more than J5 ° C / 4.
После термообработки качество сварного цилиндра отвечает техническим требовани м .After heat treatment, the quality of the welded cylinder meets the technical requirements.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU742059978A SU615141A1 (en) | 1974-09-19 | 1974-09-19 | Method of heat treatment of welded hollow articles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU742059978A SU615141A1 (en) | 1974-09-19 | 1974-09-19 | Method of heat treatment of welded hollow articles |
Publications (1)
Publication Number | Publication Date |
---|---|
SU615141A1 true SU615141A1 (en) | 1978-07-15 |
Family
ID=20596010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU742059978A SU615141A1 (en) | 1974-09-19 | 1974-09-19 | Method of heat treatment of welded hollow articles |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU615141A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5217158A (en) * | 1992-07-14 | 1993-06-08 | Brush Wellman, Inc. | Process for thermodynamically treating a region joining two members |
-
1974
- 1974-09-19 SU SU742059978A patent/SU615141A1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5217158A (en) * | 1992-07-14 | 1993-06-08 | Brush Wellman, Inc. | Process for thermodynamically treating a region joining two members |
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