CN210620873U - Cooling-free induction heater for postweld heat treatment of small-diameter calandria - Google Patents
Cooling-free induction heater for postweld heat treatment of small-diameter calandria Download PDFInfo
- Publication number
- CN210620873U CN210620873U CN201921707650.4U CN201921707650U CN210620873U CN 210620873 U CN210620873 U CN 210620873U CN 201921707650 U CN201921707650 U CN 201921707650U CN 210620873 U CN210620873 U CN 210620873U
- Authority
- CN
- China
- Prior art keywords
- calandria
- path
- inductor
- diameter
- small
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Classifications
-
- 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
Landscapes
- General Induction Heating (AREA)
Abstract
The utility model discloses a no cooling induction heater of path calandria postweld thermal treatment, be provided with path calandria conductive inductor in path calandria outer wall welding seam department, path calandria conductive inductor is slice snakelike wainscot structure, divide left side slice path calandria conductive inductor and right side slice path calandria conductive inductor, constitute by a plurality of fan ring shaped structure, the quantity of fan ring shaped structure is confirmed by the quantity of path pipe in the path calandria, the inner ring radius b of fan ring shape equals radius a of path pipe plus the tube wall thickness c of path pipe, left side slice path calandria conductive inductor and right side slice path calandria conductive inductor are the semi-surrounding shape and paste on the outer wall of path calandria. The utility model provides a path calandria that traditional copper pipe is difficult to handle weld the installation problem of inductor under heat treatment problem and the complex condition, thereby reduced traditional water cooling circulation system and practiced thrift construction cost to improve the bulk strength of inductor, prolonged life.
Description
Technical Field
The utility model relates to a heat treatment technical field, concretely relates to path calandria postweld thermal treatment does not have cooling induction heater, is applicable to the postweld thermal treatment heating of the interior heating surface pipe of thermal power plant's boiler.
Background
The traditional postweld heat treatment of the welded joint of the heating surface pipe in the boiler of the thermal power plant adopts flame heating or far infrared heating. Flame heating is difficult to ensure uniform temperature due to low efficiency and great influence of operation skills, and is only used for postweld heat treatment of individual repair welding joints of medium and low alloy steel. The flexible resistance heating is suitable for preheating before welding, postheating and postwelding heat treatment, adopts a thermocouple to measure the temperature, and uses automatic temperature control equipment to monitor and record the temperature. However, when the flexible resistance heating is adopted, the requirement on the surface quality of the processed welding joint is high, and a special clamp is required to be manufactured for tightly adhering the heater and the weldment, so that the operation is troublesome and a large space is required. When the far infrared heating is carried out, each welding opening heating device, each thermocouple and each heat preservation device are installed one by one, the efficiency is low, and the temperature field is influenced by a plurality of factors; when the number of the welded junctions is small and the wall thickness of the part is not large, the heat treatment method can meet the requirement of engineering progress and can also ensure the temperature gradient of the joint area of the part. However, with the rapid increase of the number of joints needing postweld heat treatment, the increase of time required for postweld heat treatment and the deterioration of a temperature field caused by the increase of the wall thickness of a material, the traditional heating method and process are far from meeting the requirements of engineering progress and engineering quality. Quality accidents (such as rework, cutting off a welding joint and re-welding) caused by the traditional postweld heat treatment process appear greatly in recent years, wherein the welding joint of the small-diameter tube with the largest number and the most prominent problem is the welding joint of the small-diameter tube with the heating surface.
The medium frequency induction heating utilizes the principle that the conversion among electricity, magnetism and heat energy is utilized to heat the heated object, and can be used for carrying out postweld heat treatment on a welded joint. The current inductors are mainly classified into two types, one type is wound by a copper pipe and cooled by water, the other type is wound by a copper cable, and a heat insulation layer is arranged between the copper cable and a heated workpiece. Medium frequency induction heating has been used for heat treatment of small-diameter pipe materials, but because the space between the small-diameter pipes of the heating surface is small and small, and the space between the small-diameter pipes is only about 5mm, the existing inductor can not be installed, so that the medium frequency induction heating is not applied to the heat treatment problem of the small-diameter calandria.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the utility model provides a no cooling induction heater of small diameter calandria postweld heat treatment, this kind of inductor is suitable for plane heating, arc surface or other can expand into planar heating occasions, through designing the inductor into slice snakelike wainscot structure, has solved the small diameter calandria postweld heat treatment problem that traditional copper pipe is difficult to handle.
The utility model discloses a technical scheme who solves technical problem and take is:
the utility model provides a no cooling induction heater of path calandria postweld thermal treatment, includes the path calandria, the path calandria comprises the path calandria footpath pipe that equals, path calandria outer wall welding seam department is provided with the electrically conductive inductor of path calandria, path calandria electrically conductive inductor is slice snakelike wainscot structure, divides left side slice path calandria electrically conductive inductor and the electrically conductive inductor of right side slice path calandria, left side slice path calandria electrically conductive inductor and the electrically conductive inductor of right side slice path calandria form by a plurality of fan ring shape structure, and the quantity of fan ring shape structure is confirmed by the quantity of path pipe in the path calandria, and the inner ring radius b of fan ring shape equals radius a of path pipe plus the wall thickness c of path pipe, promptly: b = a + c, the left sheet-shaped small-diameter calandria conductive inductor and the right sheet-shaped small-diameter calandria conductive inductor are adhered to the outer wall of the small-diameter calandria in a semi-surrounding shape; the U-shaped winding turns of the winding belt of the sheet-shaped snake-shaped veneering structure are matched with the diameter of the small-diameter pipe in the small-diameter pipe, and the U-shaped winding turns are increased by one turn when the diameter of the small-diameter pipe is increased by 20 mm; the gap distance L between the left sheet-shaped small-diameter calandria conductive inductor and the right sheet-shaped small-diameter calandria conductive inductor is equal to the wall thickness c of the small-diameter pipe, the width n of a winding belt of the sheet-shaped snake-shaped veneering structure is 1-1.3 times of the wall thickness of the small-diameter pipe, and the gap distance m between adjacent winding belts is 0.6-0.8 times of the wall thickness of the small-diameter pipe; the left sheet-shaped small-diameter calandria conductive sensor and the right sheet-shaped small-diameter calandria conductive sensor respectively comprise a calandria sensor insulating layer and a calandria sensor conductive layer (and a calandria sensor insulating layer from inside to outside, and the calandria sensor insulating layer is adhered to the outer wall of the small-diameter calandria.
The conducting layer of the calandria inductor is formed by cutting a copper plate, and Ni-P alloy is chemically plated on the surface of the copper plate to prevent the conducting layer of the calandria inductor from being oxidized at high temperature; the calandria inductor insulating layer is positioned between the small-diameter calandria and the calandria inductor conducting layer, and has double effects of insulation and heat preservation; the calandria inductor heat-insulating layer is positioned on the outer side of the calandria inductor conducting layer, and has double effects of insulation and heat preservation.
The manufacturing method of the no-cooling induction heater for the post-welding heat treatment of the small-diameter calandria comprises the following specific steps:
① cutting and molding a copper plate with the thickness of 0.3-0.5 mm according to the shapes of the left flaky small-diameter calandria conductive inductor and the right flaky small-diameter calandria conductive inductor, and bending the copper plate into a flaky snake-shaped veneering structure to obtain an inductor conductive layer;
②, chemically plating a layer of Ni-P alloy on the surface of the conducting layer of the inductor to prevent the conducting layer of the inductor from being oxidized at high temperature, wherein the thickness of the Ni-P alloy plating layer is 1/12-1/15 of the thickness of the conducting layer of the inductor;
③ an inductor insulating layer is arranged between the inductor conducting layer and the small-diameter calandria, the inductor insulating layer is formed by bonding glass ribbons layer by layer through a high-temperature binder, the high-temperature binder is formed by mixing aluminum oxide and aluminum dihydrogen phosphate, the molar ratio of the aluminum oxide to the aluminum dihydrogen phosphate is 1:2, and the thickness of the inductor insulating layer is 1/6-1/8 of the thickness of the small-diameter calandria;
④, arranging an inductor heat-insulating layer outside the inductor conducting layer and the Ni-P alloy coating, wherein the inductor heat-insulating layer is formed by bonding glass ribbons layer by layer through a high-temperature adhesive, the high-temperature adhesive is formed by mixing alumina and aluminum dihydrogen phosphate, the molar ratio of the alumina to the aluminum dihydrogen phosphate is 1:2, and the thickness of the inductor heat-insulating layer is 1/5-1/6 of the thickness of the pipe wall of the small-diameter pipe;
⑤ the thickness of the inductor insulating layer is larger than or equal to the thickness of the inductor insulating layer;
⑥ when the left sheet small-diameter calandria conductive inductor and the right sheet small-diameter calandria conductive inductor are manufactured, respectively bonding an inductor insulating layer, an inductor conductive layer and an inductor insulating layer on the dies of the left sheet small-diameter calandria conductive inductor and the right sheet small-diameter calandria conductive inductor in sequence, naturally airing for 0.5-1.0 hour after bonding, and then heating and drying at the temperature of 60-80 ℃;
⑦ after the left sheet small-diameter calandria conductive inductor and the right sheet small-diameter calandria conductive inductor are manufactured, the left sheet small-diameter calandria conductive inductor and the right sheet small-diameter calandria conductive inductor are bent and formed after recrystallization annealing, and the radius b of each sector annular bending radian in the left sheet small-diameter calandria conductive inductor and the right sheet small-diameter calandria conductive inductor is the radius a of a small-diameter pipe in the small-diameter calandria plus the pipe wall thickness c of the small-diameter pipe, namely b = a + c;
⑧, subjecting the bent and formed left sheet-shaped small-diameter calandria conductive inductor and the right sheet-shaped small-diameter calandria conductive inductor to stress relief annealing and chemical nickel-phosphorus alloy plating processes to obtain a formed left sheet-shaped small-diameter calandria conductive inductor and a formed right sheet-shaped small-diameter calandria conductive inductor;
⑨ when in use, the left sheet small-diameter calandria conductive inductor and the right sheet small-diameter calandria conductive inductor are pasted on the outer wall of the small-diameter calandria in a semi-surrounding shape.
The copper after cold deformation can produce work hardening and residual internal stress, the utility model discloses carry out recrystallization annealing with the copper that is processed, eliminate the work hardening effect on the one hand and be convenient for carry out bending deformation to it on next step, on the other hand eliminates the internal stress and avoids the inductor during operation size to change, improves the dimensional stability of electrically conductive inductor.
The inside great residual internal stress that has of copper after the bending, the utility model discloses thereby carry out destressing annealing internal stress to the copper after the bending, the trend that the electric conductor during operation produced deformation, fracture in the reduction conductive inductor.
The utility model adopts the Cu sheet with a certain thickness to manufacture the inductor, saves space, but can not adopt water cooling, so the method of chemical plating Ni-P is adopted to prevent the inductor from generating oxidation during heating.
The utility model discloses an actively beneficial effect as follows:
1. the space is saved:
the inductor is made of the sheet-shaped veneered copper sheet, the purpose of miniaturization of the inductor is achieved, the problem caused by narrow gaps of the calandria on the heating surface is solved, the inductor is designed into a two-piece structure, the two inductors are directly combined through a mechanical method during heating, and the trouble encountered during installation of the integral inductor is avoided.
2. Cooling in the absence of water:
the sheet inductor does not need to be cooled by water, so that the cost is saved by reducing the traditional water cooling circulation system.
3. High-temperature oxidation prevention of the chemical plating layer:
when adopting pure copper to do the inductor material, if not cooling, the temperature of inductor is close heating temperature, very easily oxidizes, the utility model discloses chemical plating Ni-P alloy cladding material can effectively prevent the oxidation on the inductor surface.
4. Heat insulation composite layer:
the utility model discloses be the high temperature binder at the inductor surface with aluminium oxide + aluminium dihydrogen phosphate mixture, bond the glass ribbon on the inductor surface, play insulating and heat retaining dual function to improve the bulk strength of inductor, increase of service life.
Drawings
FIG. 1 is a schematic structural view of a conductive sensor with a flaky serpentine overlay according to the present invention;
FIG. 2 is a schematic diagram of the position structure of the small-diameter comb and the sheet-shaped serpentine faced conductive sensor;
fig. 3 is a top view of fig. 2.
Detailed Description
The invention will be further explained and explained with reference to the following examples and drawings:
example (b): referring to fig. 1, fig. 2 and fig. 3, a no cooling induction heater of path calandria postweld heat treatment, including path calandria 3, path calandria 3 comprises the path pipe of a plurality of constant diameter, be provided with path calandria conductive inductor in 3 outer wall welds of path calandria department, path calandria conductive inductor is slice snakelike wainscot structure, divide left side slice path calandria conductive inductor 1 and right side slice path calandria conductive inductor 2, left side slice path calandria conductive inductor 1 and right side slice path calandria conductive inductor 2 constitute by a plurality of fan ring shape structure, the quantity of fan ring shape structure is confirmed by the quantity of path pipe in the path calandria, fan ring shape's inner ring radius b equals radius a of path pipe plus the pipe wall thickness c of path pipe, promptly: b = a + c, and the left sheet-shaped small-diameter comb conductive sensor 1 and the right sheet-shaped small-diameter comb conductive sensor 2 are adhered to the outer wall of the small-diameter comb 3 in a semi-surrounding shape; the U-shaped winding turns of the winding belt of the sheet-shaped snake-shaped veneering structure are matched with the diameter of the small-diameter pipe in the small-diameter pipe 3, and the U-shaped winding turns are increased by one turn when the diameter of the small-diameter pipe is increased by 20 mm; the gap distance L between the left flaky small-diameter calandria conductive inductor 1 and the right flaky small-diameter calandria conductive inductor 2 is equal to the wall thickness c of the small-diameter pipe, the width n of a winding belt of the flaky snakelike veneered structure is 1-1.3 times of the wall thickness of the small-diameter pipe, and the gap distance m between adjacent winding belts is 0.6-0.8 times of the wall thickness of the small-diameter pipe; the left sheet-shaped small-diameter calandria conductive sensor 1 and the right sheet-shaped small-diameter calandria conductive sensor 2 comprise a calandria sensor insulating layer 31, a calandria sensor conductive layer 32 and a calandria sensor insulating layer 33 from inside to outside, and the calandria sensor insulating layer 31 is adhered to the outer wall of the small-diameter calandria 3.
The calandria inductor conducting layer 32 is formed by cutting a copper plate, and Ni-P alloy is chemically plated on the surface of the calandria inductor conducting layer 32 to prevent the calandria inductor conducting layer from being oxidized at high temperature; the calandria inductor insulating layer 31 is positioned between the small-diameter calandria 3 and the calandria inductor conducting layer 32, and has double effects of insulation and heat preservation; the calandria inductor insulating layer 33 is located outside the calandria inductor conducting layer 32, and has double effects of insulation and heat preservation.
The manufacturing method of the small-diameter calandria postweld heat treatment cooling-free induction heater comprises the following specific steps:
① cutting and molding a copper plate with the thickness of 0.3-0.5 mm according to the shapes of the left flaky small-diameter calandria conductive inductor 1 and the right flaky small-diameter calandria conductive inductor 2, and bending the copper plate into a flaky snake-shaped veneering structure to obtain an inductor conductive layer 32;
② chemically plating a layer of Ni-P alloy on the surface of the inductor conducting layer 32 to prevent oxidation at high temperature, wherein the thickness of the Ni-P alloy plating layer is 1/12-1/15 of the thickness of the inductor conducting layer 32;
③ an inductor insulating layer 31 is arranged between the inductor conducting layer 32 and the small-diameter gauntlet 3, the inductor insulating layer 31 is formed by bonding glass ribbons layer by layer through a high-temperature bonding agent, the high-temperature bonding agent is formed by mixing aluminum oxide and aluminum dihydrogen phosphate, the molar ratio of the aluminum oxide to the aluminum dihydrogen phosphate is 1:2, and the thickness of the inductor insulating layer 31 is 1/6-1/8 of the thickness of the pipe wall of the small-diameter gauntlet;
④, an inductor heat-insulating layer 33 is arranged outside the inductor conducting layer 32 and the Ni-P alloy coating, the inductor heat-insulating layer 33 is formed by bonding glass ribbons layer by layer through a high-temperature adhesive, the high-temperature adhesive is formed by mixing alumina and aluminum dihydrogen phosphate, the mole ratio of the alumina to the aluminum dihydrogen phosphate is 1:2, and the thickness of the inductor heat-insulating layer 33 is 1/5-1/6 of the thickness of the pipe wall of the small-diameter pipe;
⑤ the thickness of the inductor insulation layer 33 is greater than or equal to the thickness of the inductor insulation layer 31;
⑥ when the left sheet-shaped small-diameter calandria conductive sensor 1 and the right sheet-shaped small-diameter calandria conductive sensor 2 are manufactured, the sensor insulating layer 31, the sensor conductive layer 32 and the sensor insulating layer 33 are sequentially bonded on the dies of the left sheet-shaped small-diameter calandria conductive sensor 1 and the right sheet-shaped small-diameter calandria conductive sensor 2 respectively, and then naturally dried for 0.5 to 1.0 hour after bonding, and then heated and dried at the temperature of between 60 and 80 ℃;
⑦ after the left sheet small-diameter calandria conductive inductor 1 and the right sheet small-diameter calandria conductive inductor 2 are manufactured, the left sheet small-diameter calandria conductive inductor 1 and the right sheet small-diameter calandria conductive inductor 2 are bent and formed after recrystallization annealing, and the radius b of each sector annular bending radian in the left sheet small-diameter calandria conductive inductor 1 and the right sheet small-diameter calandria conductive inductor 2 is the radius a of a small-diameter pipe in the small-diameter calandria 3 plus the pipe wall thickness c of the small-diameter pipe, namely b = a + c;
⑧, subjecting the bent and formed left sheet-shaped small-diameter calandria conductive inductor 1 and the right sheet-shaped small-diameter calandria conductive inductor 2 to stress relief annealing and chemical nickel-phosphorus alloy plating processes to obtain the formed left sheet-shaped small-diameter calandria conductive inductor 1 and the right sheet-shaped small-diameter calandria conductive inductor 2;
⑨ when in use, the left sheet conductive sensor 1 and the right sheet conductive sensor 2 are pasted on the outer wall of the small-diameter tube 3 in a semi-surrounding shape.
The utility model uses the Cu sheet with a certain thickness as the inductor, thereby greatly saving space and solving the problem of postweld heat treatment of small-diameter calandria which is difficult to treat by the traditional copper pipe; water cooling is not adopted, so that the traditional water cooling circulation system is reduced, and the cost is saved; the inductor is designed into two parts, so that the installation problem of the inductor under complex conditions is solved; the chemical plating of the Ni-P alloy on the surface of the inductor can effectively prevent the oxidation of the inductor during high-temperature heating; the surface of the inductor is bonded with a glass ribbon by using a mixture of aluminum oxide and aluminum dihydrogen phosphate as a high-temperature binder, so that the dual functions of insulation and heat preservation are achieved, the overall strength of the inductor is improved, and the service life is prolonged.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.
Claims (2)
1. The utility model provides a no cooling induction heater of postweld thermal treatment of path calandria, includes path calandria (3), path calandria (3) comprise a plurality of constant diameter path pipe, its characterized in that: path calandria (3) outer wall welding seam department is provided with path calandria conductive sensors, path calandria conductive sensors is slice snakelike wainscot structure, divides left side slice path calandria conductive sensors (1) and right side slice path calandria conductive sensors (2), left side slice path calandria conductive sensors (1) and right side slice path calandria conductive sensors (2) constitute by a plurality of fan ring structure, and the quantity of fan ring structure is confirmed by the quantity of path pipe in the path calandria, and the radius an that the inner ring radius b of fan ring shape equals the path pipe adds the wall thickness c of path pipe, promptly: b = a + c, the left sheet-shaped small-diameter calandria conductive sensor (1) and the right sheet-shaped small-diameter calandria conductive sensor (2) are adhered to the outer wall of the small-diameter calandria (3) in a semi-surrounding shape; the U-shaped winding turns of the winding belt of the sheet-shaped snake-shaped veneering structure are matched with the diameter of the small-diameter pipe in the small-diameter pipe (3), and the U-shaped winding turns are increased by one turn when the diameter of the small-diameter pipe is increased by 20 mm; the gap distance L between the left flaky small-diameter calandria conductive inductor (1) and the right flaky small-diameter calandria conductive inductor (2) is equal to the wall thickness c of the small-diameter pipe, the width n of a winding belt of the flaky snakelike veneering structure is 1 to 1.3 times of the wall thickness of the small-diameter pipe, and the gap distance m between adjacent winding belts is 0.6 to 0.8 times of the wall thickness of the small-diameter pipe; the left flaky small-diameter calandria conductive inductor (1) and the right flaky small-diameter calandria conductive inductor (2) comprise a calandria inductor insulating layer (31), a calandria inductor conductive layer (32) and a calandria inductor insulating layer (33) from inside to outside, and the calandria inductor insulating layer (31) is pasted on the outer wall of the small-diameter calandria (3).
2. The small-diameter calandria postweld heat treatment coolingless induction heater according to claim 1, characterized in that: the calandria inductor conducting layer (32) is formed by cutting a copper plate, and Ni-P alloy is chemically plated on the surface of the calandria inductor conducting layer; the calandria inductor insulating layer (31) is located between the small-diameter calandria (3) and the calandria inductor conducting layer (32), and the calandria inductor insulating layer (33) is located on the outer side of the calandria inductor conducting layer (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921707650.4U CN210620873U (en) | 2019-10-12 | 2019-10-12 | Cooling-free induction heater for postweld heat treatment of small-diameter calandria |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921707650.4U CN210620873U (en) | 2019-10-12 | 2019-10-12 | Cooling-free induction heater for postweld heat treatment of small-diameter calandria |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210620873U true CN210620873U (en) | 2020-05-26 |
Family
ID=70763699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921707650.4U Withdrawn - After Issue CN210620873U (en) | 2019-10-12 | 2019-10-12 | Cooling-free induction heater for postweld heat treatment of small-diameter calandria |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210620873U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110551881A (en) * | 2019-10-12 | 2019-12-10 | 中国电建集团河南工程有限公司 | cooling-free induction heater for postweld heat treatment of small-diameter calandria and manufacturing method thereof |
-
2019
- 2019-10-12 CN CN201921707650.4U patent/CN210620873U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110551881A (en) * | 2019-10-12 | 2019-12-10 | 中国电建集团河南工程有限公司 | cooling-free induction heater for postweld heat treatment of small-diameter calandria and manufacturing method thereof |
| CN110551881B (en) * | 2019-10-12 | 2023-05-12 | 中国电建集团河南工程有限公司 | Cooling-free induction heater for postweld heat treatment of small-diameter calandria and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102357695B (en) | Method and device for soldering metal parts and components by adopting high-frequency induction brazing | |
| CN102211235B (en) | Soldering method of heterogeneous stainless steel oil injection nozzle nut of engine | |
| CN205162726U (en) | Double -deck composite pot | |
| CN101557066B (en) | High-frequency induction brazing method for connection of deep cavity inner conductor of coaxial transmission line | |
| CN210620873U (en) | Cooling-free induction heater for postweld heat treatment of small-diameter calandria | |
| CN210596154U (en) | Cooling-free vertical welding line induction heater | |
| US4689465A (en) | Process for producing a coherent bond between thin metal surfaces | |
| CN210620895U (en) | Cooling-free induction heater for postweld heat treatment of small-diameter pipe welding joint | |
| CN103994590B (en) | Solar thermal collector and manufacture method thereof | |
| CN110551881B (en) | Cooling-free induction heater for postweld heat treatment of small-diameter calandria and manufacturing method thereof | |
| CN110564946B (en) | Non-cooling induction heater for postweld heat treatment of small-diameter pipe welding joint and manufacturing method thereof | |
| CN106229058A (en) | A kind of strong conduction copper of resistance to temperature rise aluminum interface alloy composite pipe bus | |
| CN203607246U (en) | Transformer lead soldering structure based on medium frequency induction heating principle | |
| CN101265515A (en) | Steam turbine rotor local destressing heat treatment method | |
| CN101956059A (en) | Device for continuously heating steel strip by direct energization | |
| CN110564929B (en) | Non-cooling vertical weld induction heater and manufacturing method thereof | |
| CN206222700U (en) | Finned Electromagnetic heat tube | |
| CN213086050U (en) | High-temperature heating surface welded junction and fin weld seam postweld heat treatment device | |
| CN201579294U (en) | Double-metal wrapping machine | |
| CN107447080A (en) | A kind of quick, welded seam of aluminium alloy local stress relaxation method of low temperature | |
| CN213772151U (en) | Intermediate frequency induction heater for post-welding heat treatment of tube rows on heating surface of ultra-supercritical power station boiler | |
| CN102853710A (en) | Connection method for copper-aluminum heat exchanger of gas water heater | |
| CN206747958U (en) | A kind of composite tube production system | |
| CN208227371U (en) | Ferroalloy electric furnace short net system | |
| CN206522915U (en) | Honeycomb fashion Electromagnetic heat tube heater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200526 Effective date of abandoning: 20230512 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20200526 Effective date of abandoning: 20230512 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |