CN115464235A - Assembling and welding method for high-temperature steam pipeline temperature measuring point device - Google Patents

Assembling and welding method for high-temperature steam pipeline temperature measuring point device Download PDF

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Publication number
CN115464235A
CN115464235A CN202211168654.6A CN202211168654A CN115464235A CN 115464235 A CN115464235 A CN 115464235A CN 202211168654 A CN202211168654 A CN 202211168654A CN 115464235 A CN115464235 A CN 115464235A
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China
Prior art keywords
temperature
welding
steam pipeline
sleeve
temperature steam
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CN202211168654.6A
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Chinese (zh)
Inventor
王沛
成红兵
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Huaneng Gansu Xigu Thermal Power Co ltd
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Huaneng Gansu Xigu Thermal Power Co ltd
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Priority to CN202211168654.6A priority Critical patent/CN115464235A/en
Publication of CN115464235A publication Critical patent/CN115464235A/en
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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
    • 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
    • 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
    • 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
    • B23K9/32—Accessories
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08—Protective devices, e.g. casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/202—Constituents thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

An assembling and welding method of a high-temperature steam pipeline temperature measuring point device. Due to structural reasons, improper implementation of the installation process and the like, the temperature sleeve vibrates due to the flow of high-temperature media in the pipe during operation. The invention comprises the following steps: an alloy analyzer is adopted to confirm that the temperature tube seat and the temperature sleeve are the same as the high-temperature steam pipeline in material; measuring and confirming the diameter of the opening of the high-temperature steam temperature tube seat, the inner hole of the reinforced temperature tube seat and the outer diameter of the temperature sleeve; placing the temperature pipe seat on the high-temperature steam pipeline, and then performing tack welding; putting the temperature sleeve into a temperature tube seat, and finally performing tack welding; the first welding area adopts full argon arc welding process, and the second welding area adopts argon arc welding backing. The invention is used for measuring the temperature of the high-temperature steam pipeline.

Description

Assembling and welding method for high-temperature steam pipeline temperature measuring point device
The technical field is as follows:
the invention relates to an assembling and welding method of a high-temperature steam pipeline temperature measuring point device.
The background art comprises the following steps:
a high-temperature high-pressure (t is more than or equal to 400 ℃, P is more than or equal to 5.9 MPa) steam pipeline of a thermal power plant is generally made of alloy materials with thick walls (delta is more than or equal to 20 mm) such as P91, P22, 12Cr1MoVG, and a temperature measuring device is required to be additionally arranged according to design requirements, so that the temperature of a medium in the pipeline can be conveniently monitored.
A direct-buried type non-penetration-welded structure and a cantilever beam type structure are commonly adopted for a high-temperature (the temperature is more than or equal to 400 ℃ and the pressure is more than or equal to 5.9 MPa) thick-wall (delta is more than or equal to 20 mm) steam pipeline temperature measuring sleeve, and due to structural reasons, improper execution of an installation process and the like, the temperature sleeve vibrates due to the flow of high-temperature media in the pipe during operation, fatigue cracks are formed and expanded, leakage during the operation of the pipe system is caused, and unsafe events are caused.
The invention content is as follows:
the invention aims to solve the problems and provides an assembling and welding method of a high-temperature steam pipeline temperature measuring point device.
The above purpose is realized by the following technical scheme:
an assembling and welding method for a high-temperature steam pipeline temperature measuring point device comprises the following steps:
the method comprises the following steps: an alloy analyzer is adopted to confirm that the temperature tube seat and the temperature sleeve are the same as the high-temperature steam pipeline in material;
step two: measuring and confirming the diameter of the opening of the high-temperature steam temperature tube seat, the inner hole of the reinforced temperature tube seat and the outer diameter of the temperature sleeve;
step three: placing the temperature pipe seat on the high-temperature steam pipeline, and then performing tack welding;
step four: putting the temperature sleeve into a temperature tube seat, and finally performing tack welding;
step five: the first welding area adopts a full argon arc welding process, the welding wire is the same as the pipe, the connection strength of the temperature pipe seat and the temperature sleeve is ensured, and the surface of the welding line is in smooth transition with the base metal;
step six: the second welding area adopts argon arc welding bottoming, manual electric arc filling and cover surface welding processes, welding wires, welding rods and pipes are the same, and the welding seam surface and a base metal are in smooth transition;
step seven: the welding seam is connected with the temperature sleeve and the temperature tube seat, the welding seam is connected with the high-temperature steam pipeline, after the welding is finished and the appearance inspection is qualified, the heat treatment is carried out, the nondestructive testing is carried out after the heat treatment is finished, meanwhile, the hardness inspection is carried out on the welding seam, the heat treatment is ensured to achieve the expected effect, and the welding seam quality is ensured.
According to the assembling and welding method of the high-temperature steam pipeline temperature measuring point device, the temperature pipe seat and the pipe wall of the high-temperature steam pipeline are respectively sleeved outside the temperature sleeve, the temperature pipe seat and the temperature sleeve are welded and fixed, and the temperature pipe seat and the pipe wall of the high-temperature steam pipeline are welded and fixed.
According to the assembling and welding method of the high-temperature steam pipeline temperature measuring point device, the temperature pipe seat is of a circular ring structure, a notch for welding is formed in the upper end of the temperature pipe seat, and an inclined plane is formed in the lower end of the temperature pipe seat.
According to the assembling and welding method of the high-temperature steam pipeline temperature measuring point device, the pipe wall of the high-temperature steam pipeline is of a circular ring structure, and the outer diameter of the pipe wall is larger than that of the temperature pipe seat.
According to the assembling and welding method of the high-temperature steam pipeline temperature measuring point device, the top of the temperature sleeve is provided with a screw thread connecting part for thermocouple connection.
Has the advantages that:
1. the invention adopts a full penetration and reinforced structure type, the high-temperature steam pipeline, the temperature pipe seat, the temperature sleeve and the welding material are made of the same material, the thermal expansion coefficients are the same, and the bonding strength between the high-temperature steam pipeline and the temperature pipe seat and between the temperature pipe seat and the temperature sleeve is high, so that the high-temperature steam pipeline and the temperature pipe seat are effectively integrated, and the tightness of a pipeline system and the safety and reliability of the operation of the system are ensured.
2. The invention can reliably fix the temperature sleeve from the upper point and the lower point, completely eliminate the vibration caused by medium impact in the pipe and prevent the welding seam from forming fatigue crack.
3. The invention has step-shaped uniform transition, avoids the obvious stress concentration condition, eliminates the hidden danger of welding seam cracking in operation and ensures the long-period safe operation of high-temperature steam pipelines and equipment.
4. When the thermocouple is taken out or inserted in the thermocouple installation or maintenance and replacement device, the thermocouple is only loosened or screwed from the screw thread part of the temperature measuring device, the thermocouple installation device is simple, flexible and convenient to operate, can ensure the tightness and normal use of the whole piping system, and has good application effect.
Description of the drawings:
FIG. 1 is a schematic assembled structure of the present invention;
FIG. 2 is a schematic view of the welded structure of the present invention;
in the figure: 1. a screw connection part; 2. a temperature jacket; 3. a first welding area; 4. a temperature tube base; 5. a second welding region; 6. the pipe wall of the high-temperature steam pipeline; 7. a thermocouple insertion hole; 8. the temperature sleeve is connected with the temperature tube seat through a welding seam; 9. the temperature sleeve is connected with the high-temperature steam pipeline by welding seams.
The specific implementation mode is as follows:
the assembly method, referring to fig. 1, h in fig. 1 is the depth of the sleeve inserted into the high-temperature steam pipe, which is mm
P is a gap of 4-5 mm
The beta is an assembly included angle between a temperature pipe seat and a high-temperature steam pipeline, and the angle is 90 degrees and delta is more than or equal to 20mm;
(1) An alloy analyzer is adopted to confirm that the temperature tube seat and the temperature sleeve are the same as the high-temperature steam pipeline in material,
(2) The measurement confirms that the diameter of the opening of the high-temperature steam temperature pipe seat is 38mm, the diameter of the inner hole of the reinforced temperature pipe seat is 38mm, and the outer diameter of the temperature sleeve is 37.8mm.
(3) The temperature tube seat (black) is placed on the high-temperature steam pipeline (blue) (aligned to the hole opening part), the inner wall of the temperature tube seat is ensured to be flush with the inner wall of the hole opening of the high-temperature steam pipeline, the temperature tube seat is perpendicular to the high-temperature steam pipeline, namely beta is 90 degrees, the opening gap p is adjusted to be 4-5 mm, and then tack welding is carried out.
(4) And (3) putting the temperature sleeve into the temperature tube seat, and confirming that the gap between the outer wall of the temperature sleeve and the periphery of the inner wall of the temperature tube seat is uniform and is about 0.1mm. Confirming the depth h of the temperature sleeve inserted into the tube: when the nominal drift diameter phi of the steam pipeline is less than or equal to 250mm, the insertion depth of the sleeve is preferably 70mm, and when the nominal drift diameter phi of the steam pipeline is more than 250mm, the insertion depth of the sleeve is preferably 100mm, so that the temperature measuring element (thermocouple) is ensured to have certain insertion depth. Finally, spot welding is carried out, and the assembly work of the device is completed.
The welding method comprises the following steps: referring to FIG. 2, h in FIG. 2 is the depth of the sleeve inserted into the high temperature steam pipe, mm
h1 is the height of the welding seam of the connecting angle of the temperature tube seat and the temperature sleeve tube and is 17-18 mm
h2 is the height of a fillet weld joint between the high-temperature steam pipeline and the temperature pipe seat, and is 23-25 mm; delta mm of thickness of parent metal of high-temperature steam pipeline
Delta 1, the fusion height of the welding seam of the combination area of the temperature tube seat and the temperature sleeve is 27-28 mm, the welding seam is an annular full penetration welding seam, the temperature tube seat and the temperature sleeve are well fused, the strength requirement is met, meanwhile, the welding seam is matched with a delta 2 point to form effective fixation on the temperature sleeve, and the vibration of the temperature sleeve caused by medium flowing is eliminated.
Delta 2, the fusion height of the welding seam of the combination area of the high-temperature steam pipeline and the temperature pipe seat is 6-8 mm, the welding seam is an annular full penetration welding seam, the welding seam is ensured to be well fused with the high-temperature steam pipeline and the temperature sleeve, and meanwhile, the welding seam is matched with a delta 1 point to form effective fixation on the temperature sleeve, so that the vibration of the temperature sleeve caused by the flowing of a medium is eliminated;
(1) The first welding area welding process: the full argon arc (Ws) welding process is adopted, the welding wire is the same as the pipe, the height of the fillet weld is 17-18 mm, the connection strength of the temperature pipe seat and the temperature sleeve is ensured, the surface of the weld and the base metal are in smooth transition, and the surface defects such as pits are avoided.
(2) And a second welding area welding process: argon arc welding priming, manual electric arc filling and capping (Ws/Ds) welding processes are adopted, welding wires and welding rods are the same as the pipe, the height of a fillet weld is 23-25 mm, the connecting strength of a high-temperature steam pipeline and a temperature pipe seat is guaranteed, the surface of the weld and a base metal are in smooth transition, and surface defects such as pits are avoided.
For example, when the material of the high-temperature steam pipeline is P91, the temperature pipe seat also adopts P91, and the temperature sleeve also adopts P91. During welding, the argon arc welding wire is a special welding wire TGS-9cb for P91, and the welding rod E9018-B9 for P91 is selected for manual electric arc welding.
(3) The temperature sleeve and the temperature tube seat are connected with the welding line, the temperature sleeve and the high-temperature steam pipeline are connected with the welding line, after the welding is finished and the appearance inspection is qualified, the heat treatment is carried out, the nondestructive inspection is carried out after the heat treatment is finished, meanwhile, the hardness inspection is carried out on the welding line, the heat treatment is ensured to achieve the expected effect, and the welding line quality is ensured.
(4) The two regions of δ 1 and δ 2: the delta 1 and the delta 2 reliably fix the temperature sleeve from the upper point and the lower point, and can completely eliminate the vibration caused by medium impact in the pipe.
An assembly welding method for a high-temperature steam pipeline temperature measuring point device comprises the following steps: temperature sleeve pipe 2, temperature tube socket 4 and high temperature steam conduit pipe wall 6, the temperature tube socket with high temperature steam conduit pipe wall overlap respectively the temperature sleeve pipe outside, high temperature steam conduit pipe wall be the ring structure, its external diameter is greater than the external diameter of temperature tube socket, be the even transition of stairstepping, the temperature tube socket be the ring structure, its upper end has the notch that supplies the welding, the lower extreme is the inclined plane, the temperature tube socket with the temperature sleeve pipe between welded fastening, the temperature tube socket with high temperature steam conduit pipe wall between welded fastening.
The top of the temperature sleeve is provided with a screw thread connecting part for thermocouple connection.

Claims (5)

1. An assembling and welding method of a high-temperature steam pipeline temperature measuring point device is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: an alloy analyzer is adopted to confirm that the temperature tube seat and the temperature sleeve are the same as the high-temperature steam pipeline in material;
step two: measuring and confirming the diameter of an opening of the high-temperature steam temperature pipe seat, the inner hole of the reinforced temperature pipe seat and the outer diameter of the temperature sleeve;
step three: placing the temperature pipe seat on the high-temperature steam pipeline, and then performing tack welding;
step four: putting the temperature sleeve into a temperature tube seat, and finally performing tack welding;
step five: the first welding area adopts a full argon arc welding process, the welding wire is the same as the pipe, the connection strength of the temperature pipe seat and the temperature sleeve is ensured, and the surface of the welding line is in smooth transition with the base metal;
step six: the second welding area adopts argon arc welding bottoming, manual electric arc filling and cover surface welding processes, welding wires, welding rods and pipes are the same, and the surface of a welding seam is in smooth transition with a base metal;
step seven: the temperature sleeve and the temperature tube seat are connected with the welding line, the temperature sleeve and the high-temperature steam pipeline are connected with the welding line, after the welding is finished and the appearance inspection is qualified, the heat treatment is carried out, the nondestructive inspection is carried out after the heat treatment is finished, meanwhile, the hardness inspection is carried out on the welding line, the heat treatment is ensured to achieve the expected effect, and the welding line quality is ensured.
2. The assembly welding method for the high-temperature steam pipeline temperature measuring point device as claimed in claim 1, wherein the method comprises the following steps: the temperature tube seat and the high-temperature steam pipeline pipe wall are respectively sleeved outside the temperature sleeve, the temperature tube seat and the temperature sleeve are fixedly welded, and the temperature tube seat and the high-temperature steam pipeline pipe wall are fixedly welded.
3. The assembly welding method for the high-temperature steam pipeline temperature measuring point device as claimed in claim 2, wherein the method comprises the following steps: the temperature tube seat is of a circular ring structure, a notch for welding is formed in the upper end of the temperature tube seat, and an inclined plane is formed in the lower end of the temperature tube seat.
4. The assembly welding method for the high-temperature steam pipeline temperature measuring point device as claimed in claim 3, wherein the method comprises the following steps: the pipe wall of the high-temperature steam pipeline is of a circular ring structure, and the outer diameter of the pipe wall is larger than that of the temperature pipe seat.
5. The assembly welding method for the high-temperature steam pipeline temperature measuring point device as claimed in claim 4, wherein the method comprises the following steps: the top of the temperature sleeve is provided with a screw thread connecting part for thermocouple connection.
CN202211168654.6A 2022-09-24 2022-09-24 Assembling and welding method for high-temperature steam pipeline temperature measuring point device Pending CN115464235A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211168654.6A CN115464235A (en) 2022-09-24 2022-09-24 Assembling and welding method for high-temperature steam pipeline temperature measuring point device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211168654.6A CN115464235A (en) 2022-09-24 2022-09-24 Assembling and welding method for high-temperature steam pipeline temperature measuring point device

Publications (1)

Publication Number Publication Date
CN115464235A true CN115464235A (en) 2022-12-13

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Application Number Title Priority Date Filing Date
CN202211168654.6A Pending CN115464235A (en) 2022-09-24 2022-09-24 Assembling and welding method for high-temperature steam pipeline temperature measuring point device

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