CN110331273A - A kind of weld bond heat treatment method of soft alloy pipeline - Google Patents
A kind of weld bond heat treatment method of soft alloy pipeline Download PDFInfo
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- CN110331273A CN110331273A CN201910431856.7A CN201910431856A CN110331273A CN 110331273 A CN110331273 A CN 110331273A CN 201910431856 A CN201910431856 A CN 201910431856A CN 110331273 A CN110331273 A CN 110331273A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
- B23K9/0956—Monitoring or automatic control of welding parameters using sensing means, e.g. optical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention belongs to alloy pipeline technical field of heat treatment, and in particular to a kind of welding heat treatment method of soft alloy pipeline.The method includes preheatings, weld bond welding, post weld heat treatment step before welding；Wherein, the post weld heat treatment is using the fixed thermocouple of strapping, and subregion temperature control measure is taken to heavy caliber weld bond, it is even using a piece of one, that is the corresponding thermocouple of a heater, guarantees that each heater has individual thermocouple to control, and control signal and come from heater itself, each thermocouple has a temperature display watch, and the heater chip power of same weld bond answers identical and is able to satisfy heat treatment requirements.In the method for the invention post weld heat treatment in such a way that a piece of one is even, it is ensured that the case where temperature control is accurate, avoids the occurrence of a thermocouple band multiple heater chips effectively prevent that post weld heat treatment heater chip power is excessively high, generation of temperature overheating problem.
Description
Technical field
The invention belongs to alloy pipeline technical field of heat treatment, and in particular at a kind of weld bond heat of soft alloy pipeline
Reason method.
Background technique
The main material of waste heat boiler connecting pipe includes SA-335P91,12Cr1MoVG, SA-335P12 etc..
In boiler product manufacturing process, pipeline after heat treatment and connecting tube on-site test acceptability limit (including mother
Material and weld seam) reference value it is as follows: SA-335P91 hardness term of reference are as follows: the hardness of 185-250HBW, 12Cr1MoVG refers to
Range is 141-205HBW, and the hardness term of reference of SA-335P12 is 123-195HBW.But pass through inspection center pair at present
Alloy part steel conduit base material hardness is inspected by random samples, and discovery waste heat boiler connecting pipe base material hardness number is generally near the mark down
Limit value, the alloy pipeline of soft not only loses the effect of high-strength steel, and the alloy pipeline of soft is to the construction of welding
Work brings difficulty.
Part power plant occur Overheating Treatment it is off quality cause waste heat boiler connecting pipe replace or return factory and office reason
Situation, since Gas Generator Set waste heat boiler is modularization installation, if waste heat boiler connecting pipe thermal treatment quality is not in module
It is up to standard, it will will lead to full wafer module as hardness is too low and not be available, and increase related renewal cost, delay the duration, caused by
Economic loss is huge.
To ensure that unit is run steadily in the long term, continue a kind of heat treatment method for soft alloy pipeline, to guarantee
Alloy pipe welding port thermal treatment quality when alloy base metal hardness number is relatively low.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of weld bond heat treatment method of soft alloy pipeline, to guarantee
Alloy pipe welding port thermal treatment quality when alloy base metal hardness number is relatively low reduces welding stress by weld preheating first, subtracts
The appearance of few delayed crack；The strict control interlayer temperature in weld bond welding process, effectively to avoid weld grain coarse and burn
Damage tissue；And in post weld heat treatment in such a way that a piece of one is even, it is ensured that temperature control is accurate, avoids the occurrence of a thermocouple band
The case where multiple heater chips, it effectively prevent that post weld heat treatment heater chip power is excessively high, generation of temperature overheating problem；It is welding
Reduce alloy pipeline base material using the fixed thermocouple of strapping in heat treatment afterwards and the probability of burning occur.
The present invention is achieved by the following technical solutions:
A kind of welding heat treatment method of soft alloy pipeline, which comprises
Preheating before welding: it is preheated before welding to guarantee that welding groove reaches minimum preheating temperature；
Weld bond welding: strict control interlayer temperature, when interlayer temperature overtemperature, need to stop welding immediately；Using multilayer multiple tracks
Weldering, argon tungsten-arc welding backing welding thickness degree are not less than 3mm；
Post weld heat treatment: using the fixed thermocouple of strapping, and subregion temperature control measure is taken to heavy caliber weld bond, using one
Piece one is even, i.e. the corresponding thermocouple of a heater guarantees that each heater has individual thermocouple to control, and control letter
Number come from heater itself, each thermocouple has a temperature display watch, the heater chip power of same weld bond answer it is identical and
It is able to satisfy heat treatment requirements.
Further, the material for the soft alloy pipeline for needing to be heat-treated includes SA-335P12,12Cr1MoVG, SA-
335P91。
Further, in the step of being preheated before the welding, specifically:
When the material of the soft alloy pipeline is SA-335P91, argon arc welding preheating temperature is 150~200 DEG C, electricity
Arc-welding preheating temperature is 200~250 DEG C；Interlayer temperature is 200~250 DEG C；Temperature keeps the temperature at least 30 points after being raised to preheating temperature
Clock；
When the material of the soft alloy pipeline is 12Cr1MoVG, preheating temperature is 200-300 DEG C, interlayer temperature
It is 200-300 DEG C；
When the material of the soft alloy pipeline is SA-335P12,150-200 DEG C of preheating temperature, interlayer temperature is
150-400℃；
K-type armoured thermocouple is used as temperature control component to monitor thermometric, before welding, it is ensured that groove reaches minimum
Preheating temperature is measured in groove using infrared radiation thermometer.
Further, the step of the weld bond welds, specifically:
When being welded to the soft alloy pipeline that material is SA-335P91, useWelding wire andWelding rod, the single layer of welding bead are thickened no more than core diameter, and single pass welding width is not more than the 4 of core diameter used
Times；
When being welded to the soft alloy pipeline that material is 12Cr1MoVG and SA-335P12, useWelding wire
WithWelding rod, the single layer of welding bead, which is thickened, adds 2mm no more than core diameter used, and single pass welding width is little
In 5 times of core diameter used.
Further, the step of post weld heat treatment, specifically:
When material is SA-335P91, after the completion of the weld bond welding of SA-335P91, weldment temperature is down to 80-100
DEG C, post weld heat treatment is carried out after keeping the temperature 1-2h, 750-770 DEG C of post weld heat treatment temperature；
When material is 12Cr1MoVG and SA-335P12, the heat treatment of butt welding mouth should after the completion of weld bond welds immediately into
Row, the post weld heat treatment temperature to 12Cr1MoVG material weld bond are 720-750 DEG C, to the postwelding heat of SA-335P12 material weld bond
Treatment temperature is 670-700 DEG C；
The constant temperature time of butt welding mouth is chosen all in accordance with " welding heat treatment technics regulation in the thermal power plant DL/T819 ".
Advantageous effects of the invention:
Welding process is a non-uniform heat flux and cooling process, there is very big residual stress, the present invention in weld seam
The method weld bond relatively low for alloy base metal hardness number can reduce welding stress, subtract by controlling weld preheating condition
The appearance of few delayed crack；
In the method for the invention post weld heat treatment in such a way that a piece of one is even, it is ensured that temperature control is accurate, avoids the occurrence of one
The case where a thermocouple band multiple heater chips, it effectively prevent that post weld heat treatment heater chip power is excessively high, temperature overheating problem
Generation；Using the fixed thermocouple of strapping in post weld heat treatment, reduces alloy pipeline base material and the probability of burning occur.
The method of the invention is suitable for the low situation of alloy pipeline base material hardness, is the low situation of alloy pipeline base material hardness
Under weld bond welding and thermal treatment quality provide technological guidance；Weld bond heat treatment suitable for alloy base metal hardness number
There is certain reference.
Detailed description of the invention
Fig. 1 is a kind of weld bond heat treatment method schematic cross section of soft alloy pipeline in the embodiment of the present invention；
Fig. 2 is a kind of weld bond heat treatment method side schematic view of soft alloy pipeline in the embodiment of the present invention；
Appended drawing reference: 1. thermocouples；2. heater.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
The present invention can also be understood completely in description.
It is not available, increases for the too low full wafer module that will will lead to of waste heat boiler connecting pipe hardness in the prior art
Related renewal cost, schedule delays, caused by the huge technical problem of economic loss, the embodiment of the present invention provides a kind of soft
The welding heat treatment method of alloy pipeline, the method includes preheating, weld bond welding and post weld heat treatment steps before welding；
In the present embodiment, the material for the soft alloy pipeline for needing to be heat-treated include SA-335P12,12Cr1MoVG,
SA-335P91。
Preheating before welding: it is preheated before welding to guarantee that welding groove reaches minimum preheating temperature；Specifically, when described
When the material of soft alloy pipeline is SA-335P91, argon arc welding preheating temperature is 150~200 DEG C, and electric arc welding preheating temperature is
200~250 DEG C；Interlayer temperature is 200~250 DEG C；Temperature keeps the temperature at least 30 minutes after being raised to preheating temperature；When the soft
When the material of alloy pipeline is 12Cr1MoVG, preheating temperature is 200-300 DEG C, and interlayer temperature is 200-300 DEG C；When described low
When the material of hardness alloy pipeline is SA-335P12,150-200 DEG C of preheating temperature, interlayer temperature is 150-400 DEG C；
K-type armoured thermocouple is used as temperature control component to monitor thermometric, before welding, it is ensured that groove reaches minimum
Preheating temperature is measured in groove using infrared radiation thermometer.Rock wool should be coated by whole circle at groove when necessary, prevent heat from dissipating
It loses.Wherein, for vertical tube (2G), thermocouple is symmetrically distributed in groove two sides, and two must not be less than；For horizontal tube
(5G) is then arranged symmetrically thermocouple in groove above and below.When heating, heater wrapping should vacate weld seam position, thermal insulation material wrapping
When, weld seam position is similarly vacated, but entire heater must be covered.Thermocouple is apart from bevelled edge 25-35mm.Because of welding
Process is a non-uniform heat flux and cooling process, there is very big residual stress in weld seam, weld preheating can reduce weldering
Power is scooped out, the appearance of delayed crack is reduced.
Weld bond welding: strict control interlayer temperature, when interlayer temperature overtemperature, need to stop welding immediately；Using multilayer multiple tracks
Weldering, argon tungsten-arc welding backing welding thickness degree are not less than 3mm；Specifically: when the soft alloy pipeline for being SA-335P91 to material
When being welded, useWelding wire andWelding rod, the single layer of welding bead are thickened no more than core diameter, single pass welding
Width is not more than 4 times of core diameter used；When to material be 12Cr1MoVG and SA-335P12 soft alloy pipeline into
When row welding, useWelding wire andWelding rod, the single layer of welding bead thicken straight no more than welding rod used
Diameter adds 2mm, and single pass welding width is not more than 5 times of core diameter used.Wherein, interlayer temperature is excessively high can cause heat affected area crystal grain
It is coarse, decline weld strength and low-temperature impact toughness, may be cracked in the welding process if lower than preheating temperature；Cause
This needs strict control interlayer temperature in weld bond welding step, and interlayer temperature overtemperature notifies welder to stop welding immediately, welding
When low current should be used under the premise of guaranteeing quality.
Post weld heat treatment: using the fixed thermocouple of strapping, and subregion temperature control measure is taken to heavy caliber weld bond, using one
Piece one is even, i.e. the corresponding thermocouple of a heater guarantees that each heater has individual thermocouple to control, and control letter
Number heater itself is come from, each thermocouple has a temperature display watch, avoids the occurrence of a thermocouple control multi-disc heating
The heater chip power of the case where device, same weld bond answer identical and are able to satisfy heat treatment requirements.Specifically, when material is SA-
When 335P91, after the completion of the weld bond welding of SA-335P91, weldment temperature is down to 80-100 DEG C, is welded after keeping the temperature 1-2h
After be heat-treated, 750-770 DEG C of post weld heat treatment temperature；When material is 12Cr1MoVG and SA-335P12, at the heat of butt welding mouth
It ought to be carried out immediately after the completion of weld bond welds, the post weld heat treatment temperature to 12Cr1MoVG material weld bond is 720-750 DEG C,
Post weld heat treatment temperature to SA-335P12 material weld bond is 670-700 DEG C；The constant temperature time of butt welding mouth is all in accordance with " DL/T819
Weld heat treatment technics regulation in thermal power plant " it chooses, it specifically may refer to " at the sweating heat of the thermal power plant DL/T819-210
Manage technical regulation ".
The post weld heat treatment provided in the present embodiment can effectively discharge the stress in weld seam, improve the gold of welding point
Phase constitution and mechanical property.A piece of one even mode may insure that temperature control is accurate, avoid the occurrence of the multiple heating of thermocouple band
The case where device piece, it effectively prevent that post weld heat treatment heater chip power is excessively high, generation of temperature overheating problem, and using binding
Method fixes thermocouple, reduces alloy pipeline base material and the probability of burning occurs.
And in the present embodiment, a piece of one even mode can avoid the occurrence of following situations: (1) thermocouple is placed on power
In different heater chips, the high heater chip persistently overheating of another power in parallel will lead to, when reaching phase transition temperature i.e.
Metallographic structure is caused to change.(2) heater chip power is smaller, practical to use what auxiliary heated to reach heating effect
Method, but assist having only used a thermocouple when heating, cause guard machine personnel to be unable to get auxiliary and heats each heating zone
The detailed temperature data in domain, cause delivery temperature uneven.It therefore should be according to the number of heating region when assisting heating
Amount arrangement thermocouple accomplishes that every heater arranges a thermocouple and has the complex table displays temperature of respective numbers.
In the present embodiment, by taking the post weld heat treatment of 559 weld bond of φ as an example, 8 temperature-control heat couples, 8 heaters are used
Piece, specific arrangement are as shown in Figs. 1-2.Wherein, the reason of thermocouple fixed using strapping are as follows: in project construction early period, pass through
Strapping and dot welding method are compared, identical heat treatment temperature is set, warming and cooling rate is identical, and discovery is real using the weld seam of strapping
Border temperature is more slightly lower than using the weld seam actual temperature of dot welding method, when the displays temperature of Equipment for Heating Processing reaches set temperature
When, the actual temperature of dot welding method is not much different with set temperature, and the actual temperature of strapping is used to be slightly below set temperature, most
Determine that using the fixed thermocouple of strapping, it is existing to avoid the occurrence of overtemperature burning for the alloy pipeline-weld relatively low for base material hardness number eventually
As.Strapping is relative to the maximum advantage of dot welding method can be excessively high to avoid weld bond actual heat treatment temperature, causes under hardness
Drop is obvious and unqualified metallographic structure occurs.
Application example: Guangdong Datang height wants thermoelectric cold cogeneration project #1 unit reheater inlet and outlet pipeline, reheater disengaging
Mouth main pipe exceeds the alloys such as header, reheater inlet and outlet pipeline, superheater desuperheater inlet and outlet pipeline, four big pipelines
Pipe welding port heat treatment.Above-mentioned project uses the weld bond heat treatment method of soft alloy pipeline provided by the present invention., circle
The heat treatment work of alloy pipeline completely is completed, heat treatment is primary qualified, it is ensured that the duration is not delayed, and heat treatment is saved
Cost, it is ensured that weld bond thermal treatment quality is had laid a good foundation for the subsequent stable operation of unit.
Economic and Efficiency Analysis: all alloy pipe welding port heat treatments are primary qualified, it is ensured that the service life of pipeline avoids
Pipeline is heat-treated underproof secondary heat treatment expense.Part power plant occurs that Overheating Treatment is off quality to lead to piping foundation
Or the case where returning factory and office's reason, since Gas Generator Set waste heat boiler is modularization installation, if alloy pipeline is heat-treated in module
Quality dissatisfaction, the too low full wafer module that will will lead to of hardness are not available, increase related renewal cost, delay the duration, make
At economic loss it is huge.It is wanted in thermoelectric cold cogeneration project #1 by calculating in Guangdong Datang height, using the method for the invention
40,000 yuan of expense of alloy pipeline secondary heat treatment can be saved, saves 100,000 yuan of piping foundation expense, saves 20,000 yuan of labour cost,
Bring direct economic benefit 160,000.Also, heat treatment process needs the materials such as a large amount of electric energy and rock wool, and heat treatment is primary
Qualification avoids the electric energy of repetition heat treatment consumption.
Claims (5)
1. a kind of welding heat treatment method of soft alloy pipeline, which is characterized in that the described method includes:
Preheating before welding: it is preheated before welding to guarantee that welding groove reaches minimum preheating temperature；
Weld bond welding: strict control interlayer temperature, when interlayer temperature overtemperature, need to stop welding immediately；Using multi-pass welding,
Argon tungsten-arc welding backing welding thickness degree is not less than 3mm；
Post weld heat treatment: using the fixed thermocouple of strapping, and subregion temperature control measure is taken to heavy caliber weld bond, using a piece of one
Even, i.e. the corresponding thermocouple of a heater guarantees that each heater has individual thermocouple to control, and control signal
Self-heating device itself, each thermocouple have a temperature display watch, and the heater chip power of same weld bond is answered identical and can be expired
Sufficient heat treatment requirements.
2. a kind of welding heat treatment method of soft alloy pipeline according to claim 1, which is characterized in that need at heat
The material of the soft alloy pipeline of reason includes SA-335P12,12Cr1MoVG, SA-335P91.
3. a kind of welding heat treatment method of soft alloy pipeline according to claim 2, which is characterized in that in the weldering
In the step of being preheated before connecing, specifically:
When the material of the soft alloy pipeline is SA-335P91, argon arc welding preheating temperature is 150~200 DEG C, arc welding
Preheating temperature is 200~250 DEG C；Interlayer temperature is 200~250 DEG C；Temperature keeps the temperature at least 30 minutes after being raised to preheating temperature；
When the material of the soft alloy pipeline is 12Cr1MoVG, preheating temperature is 200-300 DEG C, and interlayer temperature is
200-300℃；
When the material of the soft alloy pipeline is SA-335P12,150-200 DEG C of preheating temperature, interlayer temperature 150-
400℃；
K-type armoured thermocouple is used as temperature control component to monitor thermometric, before welding, it is ensured that groove reaches minimum preheating
Temperature is measured in groove using infrared radiation thermometer.
4. a kind of welding heat treatment method of soft alloy pipeline according to claim 2, which is characterized in that in the weldering
The step of mouth welding, specifically:
When being welded to the soft alloy pipeline that material is SA-335P91, useWelding wire andWeldering
Item, the single layer of welding bead are thickened no more than core diameter, and single pass welding width is not more than 4 times of core diameter used；
When being welded to the soft alloy pipeline that material is 12Cr1MoVG and SA-335P12, useWelding wire andWelding rod, the single layer of welding bead, which is thickened, adds 2mm no more than core diameter used, and single pass welding width is not more than
5 times of core diameter used.
5. a kind of welding heat treatment method of soft alloy pipeline according to claim 4, which is characterized in that the postwelding
The step of heat treatment, specifically:
When material is SA-335P91, after the completion of the weld bond welding of SA-335P91, weldment temperature is down to 80-100 DEG C, is protected
Carry out post weld heat treatment after warm 1-2h, 750-770 DEG C of post weld heat treatment temperature；
When material is 12Cr1MoVG and SA-335P12, the heat treatment of butt welding mouth should carry out immediately after the completion of weld bond welds,
Post weld heat treatment temperature to 12Cr1MoVG material weld bond is 720-750 DEG C, at the postwelding heat of SA-335P12 material weld bond
Managing temperature is 670-700 DEG C；
The constant temperature time of butt welding mouth is chosen all in accordance with " welding heat treatment technics regulation in 819 thermal power plant DL/T ".
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| CN114774667A (en) * | 2022-05-31 | 2022-07-22 | 西安热工研究院有限公司 | Method for preventing post-welding heat treatment cracking of power station header and connecting pipe crater |
| CN114774667B (en) * | 2022-05-31 | 2023-09-08 | 西安热工研究院有限公司 | Method for preventing power station header and connecting pipe welded junction from cracking after heat treatment |
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Application publication date: 20191015 |