CN111979400A - High-temperature heating surface welded junction and fin weld seam postweld heat treatment device and manufacturing method - Google Patents
High-temperature heating surface welded junction and fin weld seam postweld heat treatment device and manufacturing method Download PDFInfo
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- CN111979400A CN111979400A CN202010666649.2A CN202010666649A CN111979400A CN 111979400 A CN111979400 A CN 111979400A CN 202010666649 A CN202010666649 A CN 202010666649A CN 111979400 A CN111979400 A CN 111979400A
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- 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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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a post-weld heat treatment device for a high-temperature heating surface welded junction and a fin weld joint and a manufacturing method thereof, belonging to the field of post-weld heat treatment for the high-temperature heating surface welded junction and the fin weld joint. The heat treatment device comprises a temperature-control thermocouple, a host control unit, a heat insulation device and an electromagnetic induction coil, wherein the hot end of the temperature-control thermocouple is arranged on a welding opening and a fin welding seam, the cold end of the temperature-control thermocouple is connected with the host control unit, the electromagnetic induction coil is arranged above the heat insulation device, is arranged in a spiral line direction and is connected with the host control unit, and the heat insulation device is arranged above and below the welding opening and the fin welding seam. The invention also provides a manufacturing method of the high-temperature heating surface welded junction and the fin welded joint postweld heat treatment device. The heating device can heat the part uniformly, greatly reduce the residual stress of the welding line and improve the heating efficiency.
Description
Technical Field
The invention relates to a device and a manufacturing method, in particular to a high-temperature heating surface welded junction and fin weld seam postweld heat treatment device and a manufacturing method, which are used for solving the problems of difficult postweld heat treatment operation and uneven quality of the high-temperature heating surface welded junction and the fin weld seam, and provide a new device for the high-alloy fin and tube panel splicing construction site welded junction heat treatment of an ultra-supercritical unit at the temperature of 650 ℃ and above.
Background
Along with the increase of the capacity of the thermal power generating unit, 9Cr high alloy steel (such as 10Cr9Mo1 VNb) is applied to a high-temperature heating surface tube bank of the supercritical thermal power generating unit in a large amount, when a tube panel with fins made of the steel is installed on a construction site, welding junctions and fin sealing welding seams of the high alloy are inevitably formed, after welding of the welding seams, post-welding heat treatment is needed, however, due to the limitation of space positions, after welding, the post-welding heat treatment of the welding junctions and the fins by adopting a traditional ceramic heater heating mode is difficult to ensure the temperature balance of each welding junction and each fin, the hardness of the welding junctions and the welding seams of the fins of the high-temperature heating surface exceeds the standard, and the high-temperature heating surface is leaked seriously, so that the unit is abnormally shut down, and certain impact is.
The high alloy steel welding seam can reduce the residual stress of welding, prevent the generation of welding defects and improve the structure and performance of the welding seam through effective pre-welding preheating and post-welding heat treatment.
The invention discloses an invention patent named as a medium-frequency induction heating process and device for pipeline welding heat treatment in Chinese patent with publication number CN104694716B, namely 03 and 29 in 2017. The patent includes: measuring the outer diameter d and the wall thickness of the pipeline; (II) selecting an intermediate frequency power supply: the power of the medium frequency power supply is more than or equal to P, P ═ d ÷ P)1/2X d x 17; (III) calculating the heating width: l x 70% heating width L x 140%, L ═ d ÷ s)1/2X 4.5+ x 5.3; fixing the hot end of the thermocouple on the temperature sampling point of the pipeline welding seam; fifthly, wrapping the heat insulation material around the pipeline welding seam; winding a metal conductor on the outer side of the heat insulation layer to form a spring-shaped medium-frequency induction coil; and (seventhly) connecting the intermediate frequency induction coil with an intermediate frequency power supply, starting the intermediate frequency power supply to operate for heat treatment, and turning off the intermediate frequency power supply after the whole heat treatment is finished. Although the process of the patent has good heat treatment effect and thorough residual stress elimination, the service life of the welding seam after heat treatment is more than 2 times of that of a ceramic resistance heating type; but the post-welding heat treatment of the welded junction fins can hardly ensure the temperature balance of each welded junction and the fins, so that the hardness of the welded junctions on the high-temperature heating surface and the weld joints of the fins exceeds the standard; it also has the above-mentioned drawbacks.
The invention discloses an invention patent named as a medium-frequency induction heat treatment process of a pipeline welded junction in Chinese patent with publication number CN108330271A, namely, the publication number is 27/07/2018. The heat treatment process comprises the following steps: 1) preparing a weld crater to be heat-treated, calculating an outer diameter/wall thickness value, a heating width value and a weld crater heating power value according to the specification and the heating coefficient of the pipeline, determining the number of induction coil coils and determining the coil spacing; 2) fixing a thermocouple, wrapping and fixing one thermocouple at the far end outside the heat insulation width by using an iron wire, and fixing and binding the thermocouple at the near seam area by using a bandage; 3) binding the welding opening, namely wrapping the thermocouple and the welding opening together by using hard heat-preservation cotton, and fixing and binding by using a bandage; 4) winding an induction coil, winding the induction coil outside the heat insulation cotton, and adjusting the coil interval; 5) inputting heat treatment process parameters; 6) starting the induction heating device; 7) slowly cooling the welded junction to room temperature, removing the external induction coil, the heat insulation cotton and the thermocouple, and performing physical and chemical inspection and nondestructive detection; although the process is simple to operate, low in investment cost, high in production efficiency, energy-saving and environment-friendly, the use requirement cannot be met, and the balance of the temperature of each welded junction and the temperature of each fin are difficult to guarantee by carrying out postweld heat treatment on the welded junction fins; it also has the above-mentioned drawbacks.
Therefore, it is particularly necessary to provide a heat treatment apparatus and a manufacturing method thereof, which have a reasonable structural design, uniformly heat the heating portion, greatly reduce the residual stress of the weld joint, and simultaneously improve the heating efficiency.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the high-temperature heating surface weld crater, the fin weld seam postweld heat treatment device and the manufacturing method, which have the advantages of reasonable structural design, safety, reliability, convenient operation, uniform heating of a heating part, great reduction of the residual stress of the weld seam and improvement of the heating efficiency.
The technical scheme adopted by the invention for solving the problems is as follows: the postweld heat treatment device for the high-temperature heating surface weld craters and the fin weld seams comprises a temperature control thermocouple and a host control unit, wherein the hot end of the temperature control thermocouple is arranged on the weld craters and the fin weld seams, and the cold end of the temperature control thermocouple is connected with the host control unit; the method is characterized in that: the electromagnetic induction coil is arranged above the heat insulation device, is arranged in a spiral line direction and is connected with the host control unit, and the heat insulation device is arranged above and below the welded junction and the welding seam of the fins.
Preferably, the temperature-control thermoelectric system adopts a K-index thermoelectric couple, the material is nickel-chromium-nickel-silicon or nickel-chromium-nickel-aluminum, the model is WRN or WRNK, and the temperature-control thermoelectric system adopts a welding type thermoelectric couple.
Preferably, the heat insulation device adopts an aluminum silicate fiber needled blanket.
Preferably, the electromagnetic induction coil is made of a plurality of strands of copper-aluminum metal wires, the periphery of each metal wire is wrapped by a phlogopite inner layer, and the periphery of the phlogopite outer layer is wrapped by a high-temperature-resistant adhesive tape woven by glass fiber.
Preferably, the electromagnetic induction coil of the present invention is disposed on one side of the heating workpiece using a transverse flux design.
Preferably, the host control unit of the invention adopts an IGBT induction heating power supply of an inverter driving circuit.
Preferably, the host control unit controls the output power of the electromagnetic induction coil according to preset process parameters according to the temperature monitored by the temperature control thermocouple, so as to ensure that the temperature of the welding seam of the crater and the fin conforms to the process.
The invention also provides a manufacturing method of the high-temperature heating surface welded junction and fin weld seam postweld heat treatment device, which is characterized by comprising the following steps of: the method comprises the following steps:
A) fixing a temperature-control thermocouple: fixing the hot end of a crater temperature sampling temperature-control thermocouple on a representative crater in a spot welding mode, wherein the direction of the temperature-control thermocouple is vertical to the axial direction of the crater; fixing the hot end of a fin sealing weld sampling temperature-control thermocouple on a representative sealing weld in a spot welding manner, wherein the trend of the temperature-control thermocouple is parallel to the axial direction of a weld crater; the contact is required to be good, and the cold end is arranged on the outer side of the heat insulation cotton;
B) laying a heat insulation device: laying a heat preservation material around a weld joint and a fin weld joint by taking the weld joint as a center, and ensuring that a cold end of a temperature control thermocouple is exposed out of a heat preservation layer, wherein the section size of a heating side aluminum silicate needled felt is 20mm, the section size of a heat preservation side aluminum silicate needled felt is 60mm, the aluminum silicate needled felt is bound by a glass ribbon or an iron wire, and when the iron wire is bound, the iron wire and an electromagnetic induction coil are required to be subjected to heat insulation and insulation;
C) installing an electromagnetic induction coil: arranging a high-temperature-resistant cable on an electromagnetic induction coil which is laid above a heating-side heat insulation layer by taking a welding seam as a center in a spiral line mode to form a spiral line, wherein the heating width is required to completely cover a welding opening to be heated and a sealing fin, and the number of turns of the high-temperature-resistant cable laid on the outer side of a heating-side aluminum silicate needle felt is calculated according to a host control unit;
D) line connection: the electromagnetic induction coil is connected with a host control unit, the temperature control thermocouples are connected with the host control unit by compensation wires, parameters of the host control unit are set according to a heat treatment process card, the operation is started, the temperature difference of temperature measurement points of the temperature control thermocouples is controlled not to be more than 30 ℃ in the heat treatment process, and the intermediate frequency input power supply is turned off after the whole heat treatment is finished.
Compared with the prior art, the invention has the following advantages and effects: (1) the electric heating postweld heat treatment can be simultaneously carried out on the welded junction and the fin sealing weld joint, the times and time of the postweld heat treatment are reduced compared with the traditional ceramic heater, the requirements of the postweld heat treatment on the heating temperature and the heat preservation time of the high-temperature heating surface welded junction and the fin sealing weld joint can be met, the heating speed is high, the heat utilization rate is high, the energy is saved remarkably, the use is safe and reliable, and the product quality is ensured; (2) the transverse magnetic flux design is adopted to be arranged on one side of a heating workpiece, the weld crater and the sealing fin weld seam are heated on one side and insulated on two sides, the operation and adjustment are convenient, the universality is strong, the postweld heat treatment of the weld crater with the pipe diameter being below 45mm and the wall thickness being below 8mm and the sealing weld seam with the fin thickness being below 6mm can be adapted, and the construction cost is greatly saved.
Drawings
FIG. 1 is a first schematic structural diagram of a thermal processing apparatus according to an embodiment of the present invention.
FIG. 2 is a second schematic structural diagram of a thermal processing apparatus according to an embodiment of the present invention.
In the figure: the device comprises a temperature control thermocouple 1, a heat insulation device 2, an electromagnetic induction coil 3, a host control unit 4, a to-be-processed welded junction 5 and a to-be-processed fin welded joint 6.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1 to 2, the high-temperature heating surface crater and fin weld seam postweld heat treatment device of the embodiment includes a temperature control thermocouple 1, a heat insulation device 2, an electromagnetic induction coil 3 and a host control unit 4; in fig. 1, a welding opening 5 to be processed and a fin welding seam 6 to be processed are also arranged.
The hot end of the temperature-control thermocouple 1 of the embodiment is arranged on the weld crater and the fin weld joint, and the cold end of the temperature-control thermocouple 1 is connected with the host control unit 4.
The temperature control thermocouple 1 adopts a K-index thermocouple, the material is nickel-chromium-nickel-silicon or nickel-chromium-nickel-aluminum, the model is WRN or WRNK, and the thermocouple adopts a welding type thermocouple and is welded on a representative welding opening and fin sealing welding seam in a welding mode.
The heat insulation device 2 of the embodiment is attached above and below the weld craters and the fin weld seams, and plays a role in heat insulation for the weld craters and the fin weld seams.
The heat insulation device 2 adopts the aluminum silicate fiber needled blanket, has excellent heat insulation performance, light weight, temperature resistance up to 1000 ℃ and high heat efficiency; the aluminum silicate needle felt is generally set to have a cross-sectional dimension of 20mm on the heating surface side and 60mm or more on the heat-insulating surface side, and the plane dimension thereof can be adjusted according to the number of craters to be subjected to post-weld heat treatment and the size of the fin area.
The electromagnetic induction coil 3 of the present embodiment is arranged above the heat insulation and preservation device 2, arranged in a spiral direction, and connected to the host control unit 4.
The electromagnetic induction coil 3 is made of a plurality of strands of copper-aluminum metal wires, the periphery of each metal wire is wrapped by a phlogopite inner layer, and the periphery of the phlogopite outer layer is wrapped by a high-temperature-resistant adhesive tape woven by glass fiber; the wire diameter is generally set to be 20-30mm, the wire can bear the temperature of more than 200 ℃, and the wire can be conveniently arranged on a heating workpiece; the induction coil is arranged on one side of the heating workpiece in a transverse magnetic flux design, and the arrangement mode avoids the defect that a heater is not easy to arrange on the top surface when the ground is combined and welded, so that the field construction efficiency is high.
In this embodiment, the host control unit 4 controls the output power of the electromagnetic induction coil 3 according to the temperature monitored by the thermocouple and the preset process parameters, so as to ensure that the temperatures of the craters and the fin welds conform to the process.
In this embodiment, the host control unit 4 adopts an inverter driving circuit IGBT induction heating power supply, which has a high workpiece heating speed, a large heating depth, and a high thermal efficiency conversion rate.
The process setting of the embodiment is as follows: and setting parameters of the host control unit 4 according to the heat treatment process card, starting operation, controlling the temperature difference of temperature measuring points of the thermocouples not to be more than 30 ℃ in the heat treatment process, and turning off the intermediate frequency input power supply after the whole heat treatment is finished.
The high alloy 10Cr9Mo1VNb tube row of this embodiment that needs to be subjected to welding heat treatment has a crater specification of phi 38 × 6mm, and a fin thickness =6mm, and 10 craters in total, and 9 fin sealing welds need post-welding heat treatment.
The required power and the number of turns of the coil are calculated according to power factors of a heating unit of a host, the turn-to-turn size of the coil is calculated according to the heating area of a welding opening and a sealing fin, the section size of the aluminum silicate needled felt on the heating side is 20mm, the section size of the aluminum silicate needled felt on the heat preservation side is 60mm, the thermocouple is a K-index welding type thermocouple which is made of nickel-chromium-nickel-silicon and has the WRNK model and the length L =1000 mm.
The manufacturing method of the high-temperature heating surface welded junction and fin welded joint post-weld heat treatment device of the embodiment specifically comprises the following operations:
(1) fixing a temperature-control thermocouple 1: fixing the hot end of the crater temperature sampling thermocouple on a representative crater in a spot welding mode, wherein the direction of the temperature control thermocouple 1 is vertical to the axial direction of the crater; fixing the hot end of a fin sealing weld sampling temperature-control thermocouple 1 on a representative sealing weld in a spot welding mode, wherein the trend of the temperature-control thermocouple 1 is parallel to the axial direction of a weld crater; the contact must be good and the cold end is placed outside the insulation wool.
(2) Laying a heat insulation device 2: the heat preservation material is laid around the weld seam of the welded junction and the fin, and the cold end of the temperature control thermocouple 1 is ensured to be exposed out of the heat preservation layer, wherein the cross section of the aluminum silicate needled felt on the heating side is 20mm, the cross section of the aluminum silicate needled felt on the heat preservation side is 60mm, the aluminum silicate needled felt is bound by adopting a glass ribbon or an iron wire, and when the iron wire is bound, the iron wire and the electromagnetic induction coil 3 are required to be subjected to heat insulation and insulation.
(3) Mounting the electromagnetic induction coil 3: arranging a high-temperature-resistant cable on an electromagnetic induction coil 3 which is laid above a heating-side heat insulation layer by taking a welding seam as a center to form a spiral line in a spiral line mode, wherein the heating width is required to completely cover a welding opening to be heated and a sealing fin, and the number of turns of the high-temperature-resistant cable laid on the outer side of a heating-side aluminum silicate needle felt is calculated according to a host control unit 4; the electromagnetic induction coil 3 is a medium frequency electromagnetic induction coil 3.
(4) Line connection: the electromagnetic induction coil 3 is connected with a host control unit 4, the temperature control thermocouples 1 are connected with the host control unit 4 by adopting compensation wires, parameters of the host control unit 4 are set according to a heat treatment process card, the operation is started, the temperature difference of temperature measuring points of the temperature control thermocouples 1 is controlled not to be more than 30 ℃ in the heat treatment process, and an intermediate frequency input power supply is turned off after the whole heat treatment is finished.
According to the embodiment, after the welding of the welded junction with the pipe diameter of less than 45mm and the wall thickness of less than 8mm and the sealing weld with the fin thickness of less than 6mm is finished in a construction site, the heating device can heat the part uniformly by adopting the device and the method, greatly reduce the residual stress of the weld and improve the heating efficiency.
The high-temperature heating surface weld crater and the fin weld seam which need to be subjected to postweld heat treatment are positioned below the heat insulation and preservation device 2, the heat insulation and preservation device 2 is positioned below the electromagnetic induction coil 3, and the electromagnetic induction coil 3 is controlled by the host control unit 4 to heat, preserve heat and reduce the temperature of the part to be treated according to the preset heating and cooling speed and heat preservation time.
Wherein, the high temperature heating surface welding mouth and the fin welding seam which need to be processed with postweld heat treatment are provided with a temperature control thermocouple 1, and the temperature control thermocouple 1 is connected with a host control unit 4 through a compensating lead.
And will be apparent to those skilled in the art from the foregoing description.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (8)
1. A postweld heat treatment device for a high-temperature heating surface welded junction and a fin weld joint comprises a temperature control thermocouple (1) and a host control unit (4), wherein the hot end of the temperature control thermocouple (1) is arranged on the welded junction and the fin weld joint, and the cold end of the temperature control thermocouple (1) is connected with the host control unit (4); the method is characterized in that: still include thermal-insulated heat preservation device (2) and electromagnetic induction coil (3), electromagnetic induction coil (3) set up in the top of thermal-insulated heat preservation device (2), are the helix direction and arrange to link to each other with host computer control unit (4), weld joint and fin welding seam top and below all set up thermal-insulated heat preservation device (2).
2. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the temperature control thermocouple (1) adopts a K-index thermocouple, the material is nickel-chromium-nickel-silicon or nickel-chromium-nickel-aluminum, the model is WRN or WRNK, and the temperature control thermocouple (1) adopts a welding type thermocouple.
3. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the heat insulation device (2) adopts an aluminum silicate fiber needled blanket.
4. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the electromagnetic induction coil (3) is made of a plurality of strands of copper-aluminum metal wires, the periphery of each metal wire is wrapped by a phlogopite inner layer, and the periphery of a phlogopite outer layer is wrapped by a high-temperature-resistant adhesive tape woven by glass fiber.
5. The high-temperature heating surface crater and fin weld seam post-weld heat treatment device according to claim 1 or 4, characterized in that: the electromagnetic induction coil (3) is arranged on one side of the heating workpiece by adopting a transverse magnetic flux design.
6. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the host control unit (4) adopts an IGBT induction heating power supply of an inverter driving circuit.
7. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the host control unit (4) controls the output power of the electromagnetic induction coil (3) according to the temperature monitored by the temperature control thermocouple (1) and preset process parameters, and ensures that the temperature of the welded junction and the welding seam of the fin conforms to the process.
8. A manufacturing method of a high-temperature heating surface welded junction and fin weld seam post-weld heat treatment device adopts the high-temperature heating surface welded junction and fin weld seam post-weld heat treatment device of any one of claims 1-7, and is characterized in that: the method comprises the following steps:
A) fixed temperature-controlled thermocouple (1): fixing the hot end of a crater temperature sampling temperature-controlling thermocouple (1) on a representative crater in a spot welding mode, wherein the direction of the temperature-controlling thermocouple (1) is vertical to the axial direction of the crater; fixing the hot end of a fin sealing weld sampling temperature-control thermocouple (1) on a representative sealing weld in a spot welding mode, wherein the trend of the temperature-control thermocouple (1) is parallel to the axial direction of a weld crater; the contact is required to be good, and the cold end is arranged on the outer side of the heat insulation cotton;
B) laying a heat insulation device (2): laying a heat preservation material around a weld joint and a fin weld joint by taking the weld joint as a center, and ensuring that a cold end of a temperature control thermocouple (1) is exposed out of a heat preservation layer, wherein the section size of a heating side aluminum silicate needled felt is 20mm, the section size of a heat preservation side aluminum silicate needled felt is 60mm, the aluminum silicate needled felt is bound by a glass ribbon or an iron wire, and when the iron wire is bound, the iron wire and an electromagnetic induction coil (3) need to be subjected to heat insulation and insulation;
C) installing an electromagnetic induction coil (3): arranging a high-temperature-resistant cable on an electromagnetic induction coil (3) which is laid above a heating-side heat-insulating layer by taking a welding seam as a center in a spiral line mode to form a spiral line, wherein the heating width is required to completely cover a welding opening to be heated and a sealing fin, and the number of turns of the high-temperature-resistant cable laid on the outer side of a heating-side aluminum silicate needle felt is calculated according to a host control unit (4);
D) line connection: the electromagnetic induction coil (3) is connected with the host control unit (4), the temperature control thermocouples (1) are connected with the host control unit (4) by adopting compensation wires, parameters of the host control unit (4) are set according to a heat treatment process card, the operation is started, the temperature difference of temperature measuring points of the temperature control thermocouples (1) is controlled not to be more than 30 ℃ in the heat treatment process, and the intermediate frequency input power supply is turned off after the whole heat treatment is finished.
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| CN202010666649.2A CN111979400A (en) | 2020-07-13 | 2020-07-13 | High-temperature heating surface welded junction and fin weld seam postweld heat treatment device and manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113172386A (en) * | 2021-03-30 | 2021-07-27 | 共享铸钢有限公司 | Defect repairing method for large steel casting |
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| CN101786213A (en) * | 2010-03-26 | 2010-07-28 | 哈尔滨工业大学 | Method for controlling generation of cold crack in welding process based on electromagnetic induction heating |
| CN104694716A (en) * | 2015-03-10 | 2015-06-10 | 扬中市盛达电器制造有限责任公司 | Pipeline welding heat treatment intermediate frequency induction heating technology and device |
| CN213086050U (en) * | 2020-07-13 | 2021-04-30 | 华电电力科学研究院有限公司 | High-temperature heating surface welded junction and fin weld seam postweld heat treatment device |
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2020
- 2020-07-13 CN CN202010666649.2A patent/CN111979400A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786213A (en) * | 2010-03-26 | 2010-07-28 | 哈尔滨工业大学 | Method for controlling generation of cold crack in welding process based on electromagnetic induction heating |
| CN104694716A (en) * | 2015-03-10 | 2015-06-10 | 扬中市盛达电器制造有限责任公司 | Pipeline welding heat treatment intermediate frequency induction heating technology and device |
| CN213086050U (en) * | 2020-07-13 | 2021-04-30 | 华电电力科学研究院有限公司 | High-temperature heating surface welded junction and fin weld seam postweld heat treatment device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113172386A (en) * | 2021-03-30 | 2021-07-27 | 共享铸钢有限公司 | Defect repairing method for large steel casting |
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