CN211771463U - Short pipe plug and plug plate welding seam heat treatment constant temperature heating device - Google Patents
Short pipe plug and plug plate welding seam heat treatment constant temperature heating device Download PDFInfo
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- CN211771463U CN211771463U CN202020127328.0U CN202020127328U CN211771463U CN 211771463 U CN211771463 U CN 211771463U CN 202020127328 U CN202020127328 U CN 202020127328U CN 211771463 U CN211771463 U CN 211771463U
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Abstract
The utility model provides a nozzle stub end cap, closure plate welding seam heat treatment constant temperature heating device, heating device includes auxiliary heating pipe, auxiliary heating pipe and end cap or closure plate fixed connection, auxiliary heating pipe's length and nozzle stub adaptation make nozzle stub end cap, closure plate welding seam heat lie in heater central point and put. The utility model discloses make the welding seam be in the highest temperature at the thermal treatment in-process, guaranteed that the nozzle stub is not overtemperature, the hardness and the mechanical properties of welding seam are in the preferred state, and 200 multichannel alloy steel closure plates, end cap are once qualified in-process.
Description
Technical Field
The utility model relates to a heating device.
Background
The header of a large coal-fired power plant boiler has a plurality of tube rows, and a blow pipe is needed after installation to prevent sundries welding rod heads and splashes in the pipelines from entering a turbine generator rotating at a high speed, and the sundries can easily damage the rotating machines. Therefore, short pipes made of corresponding materials are arranged in the middle, at the upper part and at the lower part of the end part of the header and are used as inspection hand holes during maintenance. The material of the blocking plate and the blocking head is generally steel such as 15CrMo, 12CrMoV, P91, P92 and the like. The pipe diameter is 108-219 mm. The short pipe is made of the same materials as the blocking plate and the blocking plug, such as 15CrMo, 12CrMoV, P91 and P92, and the length of the short pipe is about 100-150 mm. The end part of the short pipe consists of a flat flange blocking plate or an oval blocking plate. The material of the blocking plate and the material of the blocking head are both made of alloy steel, according to the specification of the welding heat treatment technical regulation of a thermal power plant, the stress of a welding line is eliminated after welding, the hardness of the welding line is reduced, and high-temperature tempering heat treatment is needed to ensure the quality of a welding joint.
Because the edges of the blocking plate and the blocking head are closer to the center of the welding line, the temperature of the welding line is not in the center of the heater during heat treatment, and the highest heating temperature is in the center of the short pipe, so that the temperature of the short pipe exceeds the standard, the temperature of the welding line part, the blocking plate and the blocking head which are connected with the welding line are lower than the tempering temperature of steel, and the welding joint at the position is in hidden quality danger.
Disclosure of Invention
In order to overcome the not enough of existence quality hidden danger of having nozzle stub end cap, closure plate welding seam thermal treatment, the utility model provides a nozzle stub end cap, closure plate welding seam thermal treatment constant temperature heating device makes the welding seam be in the highest temperature in heat treatment process, has guaranteed that the nozzle stub is not overtemperature, and the hardness and the mechanical properties of welding seam are in the preferred state, and 200 multichannel alloy steel closure plates of in-process, end cap are once qualified.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a nozzle stub end cap, closure plate welding seam heat treatment constant temperature heating device, heating device includes auxiliary heating pipe, auxiliary heating pipe and end cap or closure plate fixed connection, auxiliary heating pipe's length and nozzle stub adaptation make nozzle stub end cap, closure plate welding seam heat lie in heater central point and put.
Furthermore, the auxiliary heating pipe is connected with the plug or the blocking plate in a spot welding mode.
And furthermore, heat insulation cotton, a temperature control thermocouple and a monitoring thermocouple are arranged outside the short pipe, the plug or the blocking plate, and heat insulation cotton and a ceramic electric heating rope or a heating sheet are arranged outside the auxiliary heating pipe.
The beneficial effects of the utility model are that: the welding seam is at the highest temperature in the heat treatment process, the short pipe is ensured not to be over-heated, the hardness and the mechanical property of the welding seam are in a better state, and 200 alloy steel blocking plates and plugs are qualified at one time in the process.
Drawings
FIG. 1 is a schematic view of a constant temperature heating device for heat treatment of a short pipe blocking plate welding line.
FIG. 2 is a schematic view of a thermostatic heating device for heat treatment of a short-pipe plug weld joint.
Wherein, 1 is an auxiliary heating pipe, 21 is a plug, 22 is a plug plate, 3 is a short pipe, 4 is heat preservation cotton, 5 is a temperature control thermocouple, 6 is a monitoring thermocouple, and 7 is a header.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 and 2, the constant temperature heating device for heat treatment of the short pipe plug and the blocking plate welding line comprises an auxiliary heating pipe 1, wherein the auxiliary heating pipe 1 is fixedly connected with a plug 21 or a blocking plate 22, and the auxiliary heating pipe 1 is matched with the short pipe 3 in length so that the welding line heat of the short pipe plug 22 and the blocking plate 22 is located at the central position of a heater.
Further, the auxiliary heating pipe 1 is connected with the plug 21 or the blocking plate 22 through spot welding.
Still further, the short pipe 3, the plug 21 or the plug plate 22, the external arrangement heat preservation cotton 4, the temperature control thermocouple 5 and the monitoring thermocouple 6, and the external 1 arrangement heat preservation cotton and the ceramic electric heating rope or the heating sheet of the auxiliary heating pipe.
The scheme of the embodiment adopts the following steps: (1) firstly, removing oil rust within a range of 15mm inside and outside the short pipe groove and the blocking plate or the plug groove until the metal luster is exposed; (2) adopting argon arc welding to spot-weld the blocking plate and the plug in the groove; (3) selecting a waste steel pipe with the length of more than 200mm and the same as the outer diameter of the short pipe, wherein the waste steel pipe can be used as an auxiliary heating pipe during heating regardless of the material and the thickness; (4) point fixing, namely point fixing the auxiliary heating pipe on the blocking plate or the plug by adopting an argon arc welding process; (5) preheating the plugging plate or the plug according to the specified preheating temperature. Carrying out welding operation until welding is finished; (6) installing a thermocouple on the welding seam for controlling temperature, installing a thermocouple for monitoring at a position 40mm away from the welding seam of the short pipe, and monitoring the highest temperature on the short pipe; (7) installing a heating rope or a crawler shoe to enable the highest heating temperature to be in the center of the welding seam; (8) the fixed heater comprises heat-preservation cotton, and the auxiliary heating device is completely wrapped by the heat-preservation cotton; (9) performing high-temperature tempering heat treatment according to the materials and the thicknesses of the short pipe, the blocking plate and the plug at specified temperature and constant temperature time; (10) and (4) after the heat treatment is finished, removing the heat preservation, and cutting the auxiliary heating pipe by using an angle grinder, wherein the work is finished at the moment.
Claims (3)
1. The utility model provides a nozzle stub end cap, closure plate welding seam heat treatment constant temperature heating device which characterized in that, heating device includes auxiliary heating pipe, auxiliary heating pipe and end cap or closure plate fixed connection, auxiliary heating pipe's length and nozzle stub adaptation make nozzle stub end cap, closure plate welding seam heat lie in heater central point and put.
2. The thermostatic heating device for heat treatment of short pipe plugs and blocking plate welding lines according to claim 1, wherein the auxiliary heating pipe is connected with the plugs or the blocking plates in a spot welding mode.
3. The constant-temperature heating device for short pipe plug and plug plate weld joint heat treatment according to claim 1 or 2, wherein the short pipe plug, the plug plate or the plug plate is externally provided with heat insulation cotton, a temperature control thermocouple and a monitoring thermocouple, and the auxiliary heating pipe is externally provided with heat insulation cotton and a ceramic electric heating rope or a heating sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020127328.0U CN211771463U (en) | 2020-01-20 | 2020-01-20 | Short pipe plug and plug plate welding seam heat treatment constant temperature heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020127328.0U CN211771463U (en) | 2020-01-20 | 2020-01-20 | Short pipe plug and plug plate welding seam heat treatment constant temperature heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211771463U true CN211771463U (en) | 2020-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020127328.0U Active CN211771463U (en) | 2020-01-20 | 2020-01-20 | Short pipe plug and plug plate welding seam heat treatment constant temperature heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211771463U (en) |
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2020
- 2020-01-20 CN CN202020127328.0U patent/CN211771463U/en active Active
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