CN105986107A - Welded seam heat processing technology - Google Patents
Welded seam heat processing technology Download PDFInfo
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- CN105986107A CN105986107A CN201510048436.2A CN201510048436A CN105986107A CN 105986107 A CN105986107 A CN 105986107A CN 201510048436 A CN201510048436 A CN 201510048436A CN 105986107 A CN105986107 A CN 105986107A
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Abstract
The invention discloses a welded seam heat processing technology. The technology comprises the following steps: 1) local post weld heat treatment can be used for performing flame heating a low alloy pipeline with thickness of 20 mm; 2) the welded seam with a special material and special requirement selects reasonable pre-welding and post-welding method according to a welding technology; the heating rate, the constant temperature time of heat treatment temperature and the cooling rate for post weld heat treatment should accord with the following requirements: 1) when the temperature is increased to more than 400 DEG C, the heating rate is no greater than 250*25/delta DEG C/h and is no greater than 330 DEG C/h; 2) the constant temperature time for the post weld heat treatment is 1 hour at constant temperature for the wall thickness of 25 mm and is no less than 15 min, the difference between the highest temperature and the lowest temperature is less than 65 DEG C; and 3) the cooling speed after constant temperature is calculated according to 65*25/delta DEG C/h and is no greater than 260 DEG C/h, and natural cooling is carried out below 400 DEG C. The heat treatment technology has the advantages of reasonable process and low manufacture cost.
Description
Technical field
The present invention relates to a kind of weld seam Technology for Heating Processing.
Background technology
Existing weld seam Technology for Heating Processing exists that procedure arrangement is unreasonable, operation is various, higher to operator's skill requirement so that production cost is higher.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved be to provide a kind of operation rationally, the weld seam Technology for Heating Processing of low cost of manufacture.
For achieving the above object, the invention provides
A kind of weld seam Technology for Heating Processing, comprises the steps:
1), method
(1), local post weld heat treatment can carry out weld preheating with flame heating for 20mm thickness and following low-alloy pipeline；
(2), to special substance and there is particular/special requirement weld seam, before should welding according to the regulation reasonable selection of weld procedure specification and post weld heat treatment method；
2), weld preheating and during post weld heat treatment, should measure and record its temperature, the position of point for measuring temperature and quantity and should require that rationally temperature instrumentation should be qualified through measurement verification according to the regulation of the standard of execution；
3), to the steel easily producing weld delayed crack, postwelding should carry out post weld heat treatment in time, when not carrying out post weld heat treatment in time, should be heated uniformly to 300-350 DEG C immediately at postwelding, and carry out being incubated slow cooling, its heated perimeter should be identical with post weld heat treatment requirement；
4), weld preheating and post weld heat treatment temperature should meet design or the regulation of weld job guiding book, when no standard, the weld preheating of common pipe materials welding and post weld heat treatment temperature preferably meet the regulation of table 1:
Common pipe materials weld preheating and post weld heat treatment process conditions (table 1)
5), when using argon tungsten-arc welding bottoming, weld preheating temperature can reduce by 50 DEG C by the lower limit temperature of table 1 regulation；
6), the rate of heat addition of post weld heat treatment, the constant temperature time of heat treatment temperature and cooldown rate should meet the following requirements:
(1), when temperature rises to more than 400 DEG C, the rate of heat addition not should be greater than (250 × 25/ δ) DEG C/h, and cannot be greater than 330 DEG C/h；
(2), the constant temperature time of post weld heat treatment should be every 25mm wall thickness constant temperature 1 hour, and cannot be less than 15min, during constant temperature in the highest should be less than 65 DEG C with the minimum temperature difference；
(3) cooldown rate, after constant temperature not should be greater than (60 × 25/ δ) DEG C/h, and cannot be greater than 260 DEG C/h, and less than 400 DEG C can natural cooling；
(4), carry out after heat treatment reprocessing or hardness test exceedes the weld seam that regulation requires and should re-start heat treatment.
The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
A kind of weld seam Technology for Heating Processing, comprises the steps:
1), method
(1), local post weld heat treatment can carry out weld preheating with flame heating for 20mm thickness and following low-alloy pipeline；
(2), to special substance and there is particular/special requirement weld seam, before should welding according to the regulation reasonable selection of weld procedure specification and post weld heat treatment method；
2), weld preheating and during post weld heat treatment, should measure and record its temperature, the position of point for measuring temperature and quantity and should require that rationally temperature instrumentation should be qualified through measurement verification according to the regulation of the standard of execution；
3), to the steel easily producing weld delayed crack, postwelding should carry out post weld heat treatment in time, when not carrying out post weld heat treatment in time, should be heated uniformly to 300-350 DEG C immediately at postwelding, and carry out being incubated slow cooling, its heated perimeter should be identical with post weld heat treatment requirement；
4), weld preheating and post weld heat treatment temperature should meet design or the regulation of weld job guiding book, when no standard, the weld preheating of common pipe materials welding and post weld heat treatment temperature preferably meet the regulation of table 1:
Common pipe materials weld preheating and post weld heat treatment process conditions (table 1)
5), when using argon tungsten-arc welding bottoming, weld preheating temperature can reduce by 50 DEG C by the lower limit temperature of table 1 regulation；
6), the rate of heat addition of post weld heat treatment, the constant temperature time of heat treatment temperature and cooldown rate should meet the following requirements:
(1), when temperature rises to more than 400 DEG C, the rate of heat addition not should be greater than (250 × 25/ δ) DEG C/h, and cannot be greater than 330 DEG C/h；
(2), the constant temperature time of post weld heat treatment should be every 25mm wall thickness constant temperature 1 hour, and cannot be less than 15min, during constant temperature in the highest should be less than 65 DEG C with the minimum temperature difference；
(3) cooldown rate, after constant temperature not should be greater than (60 × 25/ δ) DEG C/h, and cannot be greater than 260 DEG C/h, and less than 400 DEG C can natural cooling；
(4), carry out after heat treatment reprocessing or hardness test exceedes the weld seam that regulation requires and should re-start heat treatment.
Claims (1)
1. a weld seam Technology for Heating Processing, it is characterised in that comprise the steps:
1), method
(1), local post weld heat treatment can carry out weld preheating with flame heating for 20mm thickness and following low-alloy pipeline；
(2), to special substance and there is particular/special requirement weld seam, before should welding according to the regulation reasonable selection of weld procedure specification and post weld heat treatment method；
2), weld preheating and during post weld heat treatment, should measure and record its temperature, the position of point for measuring temperature and quantity and should require that rationally temperature instrumentation should be qualified through measurement verification according to the regulation of the standard of execution；
3), to the steel easily producing weld delayed crack, postwelding should carry out post weld heat treatment in time, when not carrying out post weld heat treatment in time, should be heated uniformly to 300-350 DEG C immediately at postwelding, and carry out being incubated slow cooling, its heated perimeter should be identical with post weld heat treatment requirement；
4), weld preheating and post weld heat treatment temperature should meet design or the regulation of weld job guiding book, when no standard, the weld preheating of common pipe materials welding and post weld heat treatment temperature preferably meet the regulation of table 1:
Common pipe materials weld preheating and post weld heat treatment process conditions
5), when using argon tungsten-arc welding bottoming, weld preheating temperature can reduce by 50 DEG C by the lower limit temperature of table 1 regulation；
6), the rate of heat addition of post weld heat treatment, the constant temperature time of heat treatment temperature and cooldown rate should meet the following requirements:
(1), when temperature rises to more than 400 DEG C, the rate of heat addition not should be greater than (250 × 25/ δ) DEG C/h, and cannot be greater than 330 DEG C/h；
(2), the constant temperature time of post weld heat treatment should be every 25mm wall thickness constant temperature 1 hour, and cannot be less than 15min, during constant temperature in the highest should be less than 65 DEG C with the minimum temperature difference；
(3) cooldown rate, after constant temperature not should be greater than (60 × 25/ δ) DEG C/h, and cannot be greater than 260 DEG C/h, and less than 400 DEG C can natural cooling；
(4), carry out after heat treatment reprocessing or hardness test exceedes the weld seam that regulation requires and should re-start heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510048436.2A CN105986107A (en) | 2015-01-30 | 2015-01-30 | Welded seam heat processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510048436.2A CN105986107A (en) | 2015-01-30 | 2015-01-30 | Welded seam heat processing technology |
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| Publication Number | Publication Date |
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| CN105986107A true CN105986107A (en) | 2016-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510048436.2A Pending CN105986107A (en) | 2015-01-30 | 2015-01-30 | Welded seam heat processing technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384941A (en) * | 2018-01-09 | 2018-08-10 | 镇海石化建安工程有限公司 | A kind of the electric heating temperature device and its application method of power adjustable |
| CN110408765A (en) * | 2019-09-06 | 2019-11-05 | 哈尔滨锅炉厂有限责任公司 | A kind of thick-walled vessel case heat treating method |
| CN110541065A (en) * | 2019-08-19 | 2019-12-06 | 舞阳钢铁有限责任公司 | Postweld heat treatment process of chromium-molybdenum submerged arc welded pipe |
| RU2745915C1 (en) * | 2020-03-25 | 2021-04-02 | Акционерное общество "Инжиниринговая компания "АЭМ-технологии" (АО "АЭМ-технологии") | Method of local heat treatment of welded joints |
-
2015
- 2015-01-30 CN CN201510048436.2A patent/CN105986107A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384941A (en) * | 2018-01-09 | 2018-08-10 | 镇海石化建安工程有限公司 | A kind of the electric heating temperature device and its application method of power adjustable |
| CN110541065A (en) * | 2019-08-19 | 2019-12-06 | 舞阳钢铁有限责任公司 | Postweld heat treatment process of chromium-molybdenum submerged arc welded pipe |
| CN110408765A (en) * | 2019-09-06 | 2019-11-05 | 哈尔滨锅炉厂有限责任公司 | A kind of thick-walled vessel case heat treating method |
| RU2745915C1 (en) * | 2020-03-25 | 2021-04-02 | Акционерное общество "Инжиниринговая компания "АЭМ-технологии" (АО "АЭМ-технологии") | Method of local heat treatment of welded joints |
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Application publication date: 20161005 |
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| WD01 | Invention patent application deemed withdrawn after publication |