CN105986104A - Pipe welding thermal-treatment process - Google Patents
Pipe welding thermal-treatment process Download PDFInfo
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- CN105986104A CN105986104A CN201510047002.0A CN201510047002A CN105986104A CN 105986104 A CN105986104 A CN 105986104A CN 201510047002 A CN201510047002 A CN 201510047002A CN 105986104 A CN105986104 A CN 105986104A
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- heating
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- heater
- preheating
- pipe
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Abstract
The invention discloses a pipe welding thermal-treatment process comprising the steps of: 1) pre-heating; 2) a heating process; and 3) after-weld thermal-treatment, wherein welding joints formed through argon arc welding or low-hydrogen welding electrodes with pre-heating before welding and proper slow cooling after welding can be free of the after-weld thermal-treatment: a) the wall thickness is not more than 10 mm, the diameter is not more than 108 mm and the materials of the pipe is 15CrMo and 12CrMo; b) the wall thickness is not more than 8 mm, the diameter is not more than 108 mm, and the material of the pipe is 12Cr1MoV; and c) the wall thickness is not more than 6 mm, the diameter is not more than 63 mm, and the material of the pipe is 12Cr2MoWVTiB; 4) guarantee that the power of a heater satisfies heating demand of the pipes; 5) arrangement of a thermal couple; and 6) control on a constant temperature process, in which temperature difference between any two points in a bearing pipe is less than 50 DEG C within a heating range, and the maximum temperature difference of a pressure container is not more than 65 DEG C with a heating range. The process has reasonable steps and low cost.
Description
Technical field
The present invention relates to a kind of pipeline welding Technology for Heating Processing.
Background technology
Existing pipeline welding 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 pipeline welding Technology for Heating Processing of low cost of manufacture.
For achieving the above object, the invention provides
A kind of pipeline welding Technology for Heating Processing, comprises the steps:
1), preheating, when tube outer diameter, more than 219mm or wall thickness, the pipe more than 20mm must preheat with electrical heating；For weld preheating, the welding point of postheating, preheating uses flame preheating, and postwelding uses heat-preservation cotton insulation slow cooling；Because of special circumstances, when welding point can not do heat treatment in time, should make after heat (dehydrogenation) and process, temperature is 300-400 DEG C, and temperature retention time is 2-4 hour；
2), heating means, the weldering of there is a need to heat treatment is met and is preferably used flexible ceramic resistance to heat；nullFlexible ceramic resistance heater preheats、Heat treatment construction procedure is: check that field environmental condition and boil on the nape opposite the mouth situation passed examination are followed by by order ticket colligation preheating heat galvanic couple with solder technology person、Heater、The insulation material commissioning device preheated weld process control (wall thickness welding point more than 75mm，When being soldered to 20mm，Carry out middle flaw detection，Detect qualified after，Re-start preheating and Control Welding Process) postwelding welder's self-inspection welding point surface quality qualified colligation heat treatment thermocouple、Heater、Insulation material commissioning device heat treatment temperature-rise period control heat treatment thermostatic process control heat treatment temperature-fall period control hardness test hardness test should be searched reason time defective and take measures as again done heat treatment，Re-start hardness test afterwards--fill in completion advice note feedback consigner after hardness test is qualified and carry out next procedure detection trust；
3), post weld heat treatment, the welding point of following employing argon arc welding or the suitable Slow cooling of hydrogen controlled electrode, weld preheating and postwelding can not carry out post weld heat treatment:
A > wall thickness is not more than 10mm, diameter is not more than 108mm, and material is 15CrMo, 12CrMo pipe；
B > wall thickness is not more than 8mm, diameter is not more than 108mm, and material is 12Cr1MoV pipe；
C > wall thickness is not more than 6mm, diameter is not more than 63mm, and material is 12Cr2MoWVTiB pipe；
4), heater power size meet pipeline heating requirements, reasonable Arrangement, in requiring the thermal treatment zone, firmly guarantees effectively to contact to reduce heat with galvanized wire colligation and scatters and disappears, use fixture if desired；Width of heating is counted from Weld pipe mill, and every side is not less than 3 times of pipe wall thickness, and is not less than 60mm；Heating element heater bunched cable connects, it is desirable to all junction contacts are good, and heater block, secondary line, control point want consistent；
5), thermocouple arrange, thermocouple for measuring temperature symmetrical arrangement arrange 2-4 root at most representative Weld pipe mill, firmly guarantee there is good contact with weld metal with galvanized wire colligation；The cold end of thermocouple must come out the thermal treatment zone；When controlling multiple weldment with a thermocouple, the layout of this thermocouple should be arranged on representational welding point；
6), thermostatic process control, in thermostatic process, bearing pipe is in heated perimeter, and the temperature difference between any two points should be less than 50 DEG C；Pressure vessel is in heated perimeter, and maximum temperature difference is not preferably greater than 65 DEG C；
7), insulation width is counted from weld groove edge, it is desirable to every side is not less than 5 times of wall thickness, and every side should increase no less than 100mm than the installation width of heater；The insulation thickness that sweating heat processes is advisable with 40-60mm；
8), same stove heater when process multiple same parts, insulation width, thickness will try one's best unanimously, during employing one parts of multi-channel control, all should there be independent thermometric and control system in every road, and classifying rationally heating region, input same parameters starts simultaneously, keeps all curves consistent；
9), for supervisor and the heating taken over, the method preferably using annular-heating, width of heating is not less than in both 3 times of larger thickness；
10), when using rope type heater, the heater that weld seam both sides are arranged should be symmetrical, and heater is wound around the number of turns, density should be the most identical, and winding direction is contrary；
11), it is not required to alloy welding point and the Carbon Steel Welded Joint (weld preheating, postheating) of post weld heat treatment, available flame preheating；The construction procedure of flame preheating is: with roasting uniformly preheating (distance of flame flame core to workpiece should be at more than 10mm), must not preheat temperature radiation thermometer thermometric or tempilstick thermometric at a position extended stationary periods, and postwelding heat-preservation cotton is incubated slow cooling.
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 pipeline welding Technology for Heating Processing, comprises the steps:
1), preheating, when tube outer diameter, more than 219mm or wall thickness, the pipe more than 20mm must preheat with electrical heating；For weld preheating, the welding point of postheating, preheating uses flame preheating, and postwelding uses heat-preservation cotton insulation slow cooling；Because of special circumstances, when welding point can not do heat treatment in time, should make after heat (dehydrogenation) and process, temperature is 300-400 DEG C, and temperature retention time is 2-4 hour；
2), heating means, the weldering of there is a need to heat treatment is met and is preferably used flexible ceramic resistance to heat；nullFlexible ceramic resistance heater preheats、Heat treatment construction procedure is: check that field environmental condition and boil on the nape opposite the mouth situation passed examination are followed by by order ticket colligation preheating heat galvanic couple with solder technology person、Heater、The insulation material commissioning device preheated weld process control (wall thickness welding point more than 75mm，When being soldered to 20mm，Carry out middle flaw detection，Detect qualified after，Re-start preheating and Control Welding Process) postwelding welder's self-inspection welding point surface quality qualified colligation heat treatment thermocouple、Heater、Insulation material commissioning device heat treatment temperature-rise period control heat treatment thermostatic process control heat treatment temperature-fall period control hardness test hardness test should be searched reason time defective and take measures as again done heat treatment，Re-start hardness test afterwards--fill in completion advice note feedback consigner after hardness test is qualified and carry out next procedure detection trust；
3), post weld heat treatment, the welding point of following employing argon arc welding or the suitable Slow cooling of hydrogen controlled electrode, weld preheating and postwelding can not carry out post weld heat treatment:
A > wall thickness is not more than 10mm, diameter is not more than 108mm, and material is 15CrMo, 12CrMo pipe；
B > wall thickness is not more than 8mm, diameter is not more than 108mm, and material is 12Cr1MoV pipe；
C > wall thickness is not more than 6mm, diameter is not more than 63mm, and material is 12Cr2MoWVTiB pipe；
4), heater power size meet pipeline heating requirements, reasonable Arrangement, in requiring the thermal treatment zone, firmly guarantees effectively to contact to reduce heat with galvanized wire colligation and scatters and disappears, use fixture if desired；Width of heating is counted from Weld pipe mill, and every side is not less than 3 times of pipe wall thickness, and is not less than 60mm；Heating element heater bunched cable connects, it is desirable to all junction contacts are good, and heater block, secondary line, control point want consistent；
5), thermocouple arrange, thermocouple for measuring temperature symmetrical arrangement arrange 2-4 root at most representative Weld pipe mill, firmly guarantee there is good contact with weld metal with galvanized wire colligation；The cold end of thermocouple must come out the thermal treatment zone；When controlling multiple weldment with a thermocouple, the layout of this thermocouple should be arranged on representational welding point；
6), thermostatic process control, in thermostatic process, bearing pipe is in heated perimeter, and the temperature difference between any two points should be less than 50 DEG C；Pressure vessel is in heated perimeter, and maximum temperature difference is not preferably greater than 65 DEG C；
7), insulation width is counted from weld groove edge, it is desirable to every side is not less than 5 times of wall thickness, and every side should increase no less than 100mm than the installation width of heater；The insulation thickness that sweating heat processes is advisable with 40-60mm；
8), same stove heater when process multiple same parts, insulation width, thickness will try one's best unanimously, during employing one parts of multi-channel control, all should there be independent thermometric and control system in every road, and classifying rationally heating region, input same parameters starts simultaneously, keeps all curves consistent；
9), for supervisor and the heating taken over, the method preferably using annular-heating, width of heating is not less than in both 3 times of larger thickness；
10), when using rope type heater, the heater that weld seam both sides are arranged should be symmetrical, and heater is wound around the number of turns, density should be the most identical, and winding direction is contrary；
11), it is not required to alloy welding point and the Carbon Steel Welded Joint (weld preheating, postheating) of post weld heat treatment, available flame preheating；The construction procedure of flame preheating is: with roasting uniformly preheating (distance of flame flame core to workpiece should be at more than 10mm), must not preheat temperature radiation thermometer thermometric or tempilstick thermometric at a position extended stationary periods, and postwelding heat-preservation cotton is incubated slow cooling.
Claims (1)
1. a pipeline welding Technology for Heating Processing, it is characterised in that comprise the steps:
1), preheating, when tube outer diameter, more than 219mm or wall thickness, the pipe more than 20mm must preheat with electrical heating；For weld preheating, the welding point of postheating, preheating uses flame preheating, and postwelding uses heat-preservation cotton insulation slow cooling；Because of special circumstances, when welding point can not do heat treatment in time, should make after heat (dehydrogenation) and process, temperature is 300-400 DEG C, and temperature retention time is 2-4 hour；
2), heating means, the weldering of there is a need to heat treatment is met and is preferably used flexible ceramic resistance to heat；nullFlexible ceramic resistance heater preheats、Heat treatment construction procedure is: check that field environmental condition and boil on the nape opposite the mouth situation passed examination are followed by by order ticket colligation preheating heat galvanic couple with solder technology person、Heater、The insulation material commissioning device preheated weld process control (wall thickness welding point more than 75mm，When being soldered to 20mm，Carry out middle flaw detection，Detect qualified after，Re-start preheating and Control Welding Process) postwelding welder's self-inspection welding point surface quality qualified colligation heat treatment thermocouple、Heater、Insulation material commissioning device heat treatment temperature-rise period control heat treatment thermostatic process control heat treatment temperature-fall period control hardness test hardness test should be searched reason time defective and take measures as again done heat treatment，Re-start hardness test afterwards--fill in completion advice note feedback consigner after hardness test is qualified and carry out next procedure detection trust；
3), post weld heat treatment, the welding point of following employing argon arc welding or the suitable Slow cooling of hydrogen controlled electrode, weld preheating and postwelding can not carry out post weld heat treatment:
A > wall thickness is not more than 10mm, diameter is not more than 108mm, and material is 15CrMo, 12CrMo pipe；
B > wall thickness is not more than 8mm, diameter is not more than 108mm, and material is 12Cr1MoV pipe；
C > wall thickness is not more than 6mm, diameter is not more than 63mm, and material is 12Cr2MoWVTiB pipe；
4), heater power size meet pipeline heating requirements, reasonable Arrangement, in requiring the thermal treatment zone, firmly guarantees effectively to contact to reduce heat with galvanized wire colligation and scatters and disappears, use fixture if desired；Width of heating is counted from Weld pipe mill, and every side is not less than 3 times of pipe wall thickness, and is not less than 60mm；Heating element heater bunched cable connects, it is desirable to all junction contacts are good, and heater block, secondary line, control point want consistent；
5), thermocouple arrange, thermocouple for measuring temperature symmetrical arrangement arrange 2-4 root at most representative Weld pipe mill, firmly guarantee there is good contact with weld metal with galvanized wire colligation；The cold end of thermocouple must come out the thermal treatment zone；When controlling multiple weldment with a thermocouple, the layout of this thermocouple should be arranged on representational welding point；
6), thermostatic process control, in thermostatic process, bearing pipe is in heated perimeter, and the temperature difference between any two points should be less than 50 DEG C；Pressure vessel is in heated perimeter, and maximum temperature difference is not preferably greater than 65 DEG C；
7), insulation width is counted from weld groove edge, it is desirable to every side is not less than 5 times of wall thickness, and every side should increase no less than 100mm than the installation width of heater；The insulation thickness that sweating heat processes is advisable with 40-60mm；
8), same stove heater when process multiple same parts, insulation width, thickness will try one's best unanimously, during employing one parts of multi-channel control, all should there be independent thermometric and control system in every road, and classifying rationally heating region, input same parameters starts simultaneously, keeps all curves consistent；
9), for supervisor and the heating taken over, the method preferably using annular-heating, width of heating is not less than in both 3 times of larger thickness；
10), when using rope type heater, the heater that weld seam both sides are arranged should be symmetrical, and heater is wound around the number of turns, density should be the most identical, and winding direction is contrary；
11), it is not required to alloy welding point and the Carbon Steel Welded Joint (weld preheating, postheating) of post weld heat treatment, available flame preheating；The construction procedure of flame preheating is: with roasting uniformly preheating (distance of flame flame core to workpiece should be at more than 10mm), must not preheat temperature radiation thermometer thermometric or tempilstick thermometric at a position extended stationary periods, and postwelding heat-preservation cotton is incubated slow cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047002.0A CN105986104A (en) | 2015-01-30 | 2015-01-30 | Pipe welding thermal-treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047002.0A CN105986104A (en) | 2015-01-30 | 2015-01-30 | Pipe welding thermal-treatment process |
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| Publication Number | Publication Date |
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| CN105986104A true CN105986104A (en) | 2016-10-05 |
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| CN201510047002.0A Pending CN105986104A (en) | 2015-01-30 | 2015-01-30 | Pipe welding thermal-treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825680A (en) * | 2019-03-12 | 2019-05-31 | 中核工程咨询有限公司 | One kind being used for big wall thickness bimetal compound pipeline heat treatment method |
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2015
- 2015-01-30 CN CN201510047002.0A patent/CN105986104A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825680A (en) * | 2019-03-12 | 2019-05-31 | 中核工程咨询有限公司 | One kind being used for big wall thickness bimetal compound pipeline heat treatment method |
| CN109825680B (en) * | 2019-03-12 | 2020-12-08 | 中核工程咨询有限公司 | Heat treatment method for large-wall-thickness bimetal composite pipeline |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161005 |