CN105618945A - Thermal treatment process for weld of intermediate-diameter alloy pipeline - Google Patents
Thermal treatment process for weld of intermediate-diameter alloy pipeline Download PDFInfo
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- CN105618945A CN105618945A CN201410701706.0A CN201410701706A CN105618945A CN 105618945 A CN105618945 A CN 105618945A CN 201410701706 A CN201410701706 A CN 201410701706A CN 105618945 A CN105618945 A CN 105618945A
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Abstract
The invention discloses a thermal treatment process for a weld of an intermediate-diameter alloy pipeline. The thermal treatment process is characterized in that the process includes the following steps of (1) preparation before welding, (2) preheating before welding and (3) welding; in the step of welding, firstly, thermocouples are symmetrically arranged on the two sides of the weld edge of the welded pipeline, when thermal treatment is carried out, a rectangular heating piece is unfolded and surrounds the weld for a circle, a 16# iron wire is used for binding the rectangular heating piece, and a heater is attached to the pipeline wall; secondly, as for the weld in the horizontal fixed position, the heat preservation thickness of the lower portion should be slightly larger than that of the upper portion, the temperature is increased to a heating temperature and is basically uniform, constant-temperature time starts to be calculated when the temperature difference is smaller than 50 DEG C, and in the cooling process, operation is conducted. The thermal treatment process is simple, multiple repeated procedures are omitted, and work efficiency is improved.
Description
Technical field
The present invention relates to a kind of alloy central diameter pipe welding port Technology for Heating Processing.
Background technology
Current alloy central diameter pipe welding port Technology for Heating Processing is more complicated, also without unified specification, it does not have unified standard, the quality causing welding is uneven, a lot of operations that repeat also make under production efficiency, increase the work burden of workman, make the competitiveness of product in market not high simultaneously. For some operators just entered a profession, it does not have a clear and definite method technique, cause, when operation, mistakes and omissions often occur, in some instances it may even be possible to cause serious consequence.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved is to provide alloy central diameter pipe welding port Technology for Heating Processing, and this heat-treatment technology method is simple, eliminates a lot of repeatability operation, improves work efficiency.
For achieving the above object, the invention provides a kind of alloy central diameter pipe welding port Technology for Heating Processing, it is characterized in that, comprise the steps, 1) the front preparation of weldering: prepare, according to weld bond specification, the heat-preservation cotton that size is suitable, and wrapped with asbestos cloth, sewing is neat, to facilitate wrapping weld bond, the every side of heat-preservation cotton width cannot be less than 5 times of thickness of pipe wall, and should be not less than 100mm than the every side increase of the installation width of heater;
2) weld preheating: during heating, generally by oxygen gauge top to 3 4MPa, by Acetylene gauge top to 0.05 0.1MPa, can adjust again as required, heating process must ensure homogeneous temperature, thermometric at any time, definitely can not overtemperature, be about heat time heating time 35 minutes, when temperature is raised to the preheating temperature of requirement, and temperature is substantially uniform, namely notify that welder starts welding, in welding process, inspect by random samples at any time with tempilstick, interlayer temperature should be kept to be not less than the lower limit of preheating temperature, and not higher than 400 DEG C;
3) welding: thermocouple adopts two point symmetries to be arranged in welding pipe welding seam both sides of edges, when carrying out heat treatment, launches rectangle heating plate, around weld bond one week, to tighten with 16# iron wire, and heater and tube wall are close to, during according to rope form heater, heater is close to tube wall round and round, heat treated heating overall width, count from Weld pipe mill, every side cannot be less than 3 times of thickness of pipe wall, wrapping up two-layer by aluminium silicate needle punched blanket heat-preservation cotton, then wrap up outermost layer with asbestos cloth, the weld bond bandaged answers neat appearance, weld bond to horizontal fixed position, insulation thickness bottom should be slightly thicker than top, temperature rises to heating-up temperature, and temperature is substantially uniform, start to calculate constant temperature time when the temperature difference is less than 50 DEG C, in temperature-fall period, as cooling rate is excessively slow, heat-preservation cotton thickness can be reduced to improve cooling rate, cooling rate is no longer controlled when temperature is down to below 300 DEG C, power supply should be closed, make welding point natural cooling, before weld bond preheating, pipe is blocked, forbid to wear thorax wind in pipe, weld bond must not stress in heat treatment process, the fixing device of welding should to be heated complete could be removed, heat treated overall process should continuously perform, should not interrupt, power-off as unexpected in fault, when answering power transmission to be restored, again heat up by normal programming rate, temperature when rising to power-off opens autographic apparatus, when burning out such as heater, answering slow cooling to lower the temperature, then again wrap up, power transmission processes again.
The invention has the beneficial effects as follows: the heat-treatment technology method of the present invention is simple, eliminate a lot of repeatability operation, improve work efficiency.
Detailed description of the invention
Technical scheme disclosed by the invention is a kind of alloy central diameter pipe welding port Technology for Heating Processing, comprise the steps, 1) prepare before weldering: prepare, according to weld bond specification, the heat-preservation cotton that size is suitable, and wrapped with asbestos cloth, sewing is neat, to facilitate wrapping weld bond, the every side of heat-preservation cotton width cannot be less than 5 times of thickness of pipe wall, and should be not less than 100mm than the every side increase of the installation width of heater;
2) weld preheating: during heating, generally by oxygen gauge top to 3 4MPa, by Acetylene gauge top to 0.05 0.1MPa, can adjust again as required, heating process must ensure homogeneous temperature, thermometric at any time, definitely can not overtemperature, be about heat time heating time 35 minutes, when temperature is raised to the preheating temperature of requirement, and temperature is substantially uniform, namely notify that welder starts welding, in welding process, inspect by random samples at any time with tempilstick, interlayer temperature should be kept to be not less than the lower limit of preheating temperature, and not higher than 400 DEG C;
3) welding: thermocouple adopts two point symmetries to be arranged in welding pipe welding seam both sides of edges, when carrying out heat treatment, launches rectangle heating plate, around weld bond one week, to tighten with 16# iron wire, and heater and tube wall are close to, during according to rope form heater, heater is close to tube wall round and round, heat treated heating overall width, count from Weld pipe mill, every side cannot be less than 3 times of thickness of pipe wall, wrapping up two-layer by aluminium silicate needle punched blanket heat-preservation cotton, then wrap up outermost layer with asbestos cloth, the weld bond bandaged answers neat appearance, (2) weld bond to horizontal fixed position, insulation thickness bottom should be slightly thicker than top, temperature rises to heating-up temperature, and temperature is substantially uniform, start to calculate constant temperature time when the temperature difference is less than 50 DEG C, in temperature-fall period, as cooling rate is excessively slow, heat-preservation cotton thickness can be reduced to improve cooling rate, cooling rate is no longer controlled when temperature is down to below 300 DEG C, power supply should be closed, make welding point natural cooling, before weld bond preheating, pipe is blocked, forbid to wear thorax wind in pipe, weld bond must not stress in heat treatment process, the fixing device of welding should to be heated complete could be removed, heat treated overall process should continuously perform, should not interrupt, power-off as unexpected in fault, when answering power transmission to be restored, again heat up by normal programming rate, temperature when rising to power-off opens autographic apparatus, when burning out such as heater, answering slow cooling to lower the temperature, then again wrap up, power transmission processes again.
The heat-treatment technology method of the present invention is simple, eliminates a lot of repeatability operation, improves work efficiency.
The preferred embodiment of the present invention described in detail above. Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work. Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (1)
1. an alloy central diameter pipe welding port Technology for Heating Processing, it is characterized in that, comprise the steps, 1) prepare before weldering: prepare, according to weld bond specification, the heat-preservation cotton that size is suitable, and wrapped with asbestos cloth, sewing is neat, to facilitate wrapping weld bond, the every side of heat-preservation cotton width cannot be less than 5 times of thickness of pipe wall, and should be not less than 100mm than the every side increase of the installation width of heater;
2) weld preheating: during heating, generally by oxygen gauge top to 3 4MPa, by Acetylene gauge top to 0.05 0.1MPa, can adjust again as required, heating process must ensure homogeneous temperature, thermometric at any time, definitely can not overtemperature, be about heat time heating time 35 minutes, when temperature is raised to the preheating temperature of requirement, and temperature is substantially uniform, namely notify that welder starts welding, in welding process, inspect by random samples at any time with tempilstick, interlayer temperature should be kept to be not less than the lower limit of preheating temperature, and not higher than 400 DEG C;
3) welding: (1) thermocouple adopts two point symmetries to be arranged in welding pipe welding seam both sides of edges, when carrying out heat treatment, launches rectangle heating plate, around weld bond one week, to tighten with 16# iron wire, and heater and tube wall are close to; During according to rope form heater, heater is close to tube wall round and round, heat treated heating overall width, count from Weld pipe mill, every side cannot be less than 3 times of thickness of pipe wall, wrapping up two-layer by aluminium silicate needle punched blanket heat-preservation cotton, then wrap up outermost layer with asbestos cloth, the weld bond bandaged answers neat appearance;
(2) weld bond to horizontal fixed position, insulation thickness bottom should be slightly thicker than top, temperature rises to heating-up temperature, and temperature is substantially uniform, start to calculate constant temperature time when the temperature difference is less than 50 DEG C, in temperature-fall period, as cooling rate is excessively slow, heat-preservation cotton thickness can be reduced to improve cooling rate, cooling rate is no longer controlled when temperature is down to below 300 DEG C, power supply should be closed, make welding point natural cooling, before weld bond preheating, pipe is blocked, forbid to wear thorax wind in pipe, weld bond must not stress in heat treatment process, the fixing device of welding should to be heated complete could be removed, heat treated overall process should continuously perform, should not interrupt, power-off as unexpected in fault, when answering power transmission to be restored, again heat up by normal programming rate, temperature when rising to power-off opens autographic apparatus, when burning out such as heater, answering slow cooling to lower the temperature, then again wrap up, power transmission processes again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410701706.0A CN105618945A (en) | 2014-11-28 | 2014-11-28 | Thermal treatment process for weld of intermediate-diameter alloy pipeline |
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| CN201410701706.0A CN105618945A (en) | 2014-11-28 | 2014-11-28 | Thermal treatment process for weld of intermediate-diameter alloy pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619922A (en) * | 2017-09-29 | 2018-01-23 | 彭娟 | A kind of intermediate-frequency induction heating technique of heat-resistant high alloy steel weld bond |
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2014
- 2014-11-28 CN CN201410701706.0A patent/CN105618945A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619922A (en) * | 2017-09-29 | 2018-01-23 | 彭娟 | A kind of intermediate-frequency induction heating technique of heat-resistant high alloy steel weld bond |
| CN107619922B (en) * | 2017-09-29 | 2019-01-25 | 彭娟 | A kind of intermediate-frequency induction heating technique of heat-resistant high alloy steel weld bond |
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Application publication date: 20160601 |
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| WD01 | Invention patent application deemed withdrawn after publication |