CN114226937A - Surfacing method, repairing system and repairing method for stellite alloy of porous sliding surface of steam turbine valve element - Google Patents
Surfacing method, repairing system and repairing method for stellite alloy of porous sliding surface of steam turbine valve element Download PDFInfo
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- CN114226937A CN114226937A CN202111519207.6A CN202111519207A CN114226937A CN 114226937 A CN114226937 A CN 114226937A CN 202111519207 A CN202111519207 A CN 202111519207A CN 114226937 A CN114226937 A CN 114226937A
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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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
- B23K10/027—Welding for purposes other than joining, e.g. build-up welding
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Abstract
The invention discloses a stellite surfacing method for a porous sliding surface of a valve core, which comprises the following steps: dividing a surface to be subjected to surfacing welding of an inner hole of the valve core into a plug area and a non-plug area, wherein the plug area is an extraction hole area to be subjected to surfacing welding, the plug area is provided with a plug for plugging an extraction hole/an exhaust hole, and the plug is provided with a large end and a small end; before stellite surfacing is carried out on the plug area, spot welding is carried out by using welding materials which are the same as the valve core component or are resistant to high-temperature oxidation, the fixation is firm, and fillet welds are polished to be smooth and transited; performing stellite surfacing on a plug area and a non-plug area of a surface to be surfaced; and turning the plug area after stellite overlaying, wherein the large end of the T-shaped plug is turned and the large end of the plug is exposed out of the cleaned contour. The invention can be used for stellite surface surfacing or repairing of the valve core components of nuclear power turbines, thermal power turbines, industrial turbines and other units.
Description
Technical Field
The invention belongs to the technical field of stellite surfacing or repairing of valve element components of steam turbines, and relates to a stellite alloy surfacing method and a repairing system for porous sliding surfaces of valve elements of steam turbines.
Background
At present, for the trend of the 'three-high' with higher and higher turbine parameters (temperature, pressure and power), the temperature born by the valve core component is gradually rising from 560 ℃. The protection of the material is also changed from the nitridation of the friction pair of the valve core piece to the surface modification of stellite alloy at a higher level so as to improve the high-temperature friction resistance and oxidation resistance of the friction surface of the valve core piece. Otherwise, the valve core component is oxidized in a large area to cause jamming, and the safe operation of the turboset is endangered.
For stellite surfacing of a valve core piece, particularly for surfacing of a porous part, stellite surfacing is usually completed, and then slow drilling is carried out to penetrate the stellite, so that stellite surfacing is required except holes and a few areas nearby the holes. Because stellite alloy has high hardness, the hardness is more than HRC40, and the stellite alloy belongs to hard alloy, and the subsequent drilling process can cause cracking of the stellite alloy layer and cause rejection of the valve core piece.
In the prior art, CN102974917A discloses a gas turbine combustion chamber stellite alloy surfacing method, which is realized according to the following steps: firstly, cleaning a welding area of a workpiece by using an ethanol aqueous solution with the volume percentage content of 97-100%; secondly, heating the workpiece to 350-400 ℃ by adopting kiln equipment and keeping the temperature in the interval; thirdly, introducing argon at the flow rate of 8-10L/min for protection, and then welding the workpiece by using a direct-current argon arc welding machine; the direct-current argon arc welding machine selects a phi 2.0 cerium-tungsten electrode, the welding current is adjusted to 45-60A, the welding material used for welding is a Stellite No. 6 cobalt-based hard alloy welding wire, the welding speed is 60-80 mm/min, and the inter-road temperature is 350-400 ℃; fourthly, after the workpiece has no crack welding defects, carrying out heat treatment on the workpiece; wherein the heat treatment method comprises the following steps: heating the workpiece to 840-860 ℃ at a heating rate of 150-200 ℃/h, preserving heat for 2 hours, cooling the workpiece to below 150 ℃ at a cooling rate of 100-150 ℃/h, and then performing air cooling to complete surfacing of stellite alloy of the combustion chamber of the gas turbine. However, the stellite surfacing method disclosed by the invention is not suitable for welding and subsequent processing of the porous valve core piece.
At present, the stellite surfacing of a valve core piece, particularly the surfacing of a porous part has the technical problems of low efficiency and easy scrapping. Therefore, a new stellite welding method is needed to develop the oxidation and high temperature frictional wear resistance of the poppet core.
Disclosure of Invention
The invention provides a novel surfacing method and a repairing system for stellite alloy of a porous sliding surface of a turbine valve core, and aims to solve the technical problems that alloy after stellite surfacing has high hardness, a stellite alloy layer is cracked frequently due to drilling processing, the valve core piece is scrapped, and welding efficiency is low.
The first technical solution provided by the present invention is: a stellite surfacing method for a porous sliding surface of a valve core comprises the following steps:
step A, dividing a surface to be subjected to surfacing welding of an inner hole of a valve core into a plug area and a non-plug area in advance, wherein the plug area is an extraction hole or an exhaust hole area to be subjected to surfacing welding, the plug area is provided with a plug for plugging the extraction hole or the exhaust hole, and the plug is provided with a large end and a small end;
step B, before stellite surfacing is carried out on the choke plug area, spot welding and fixing are firmly completed by using welding materials which are the same as the valve core component or resistant to high-temperature oxidation, and fillet welds are polished to be smooth and transited;
step C, performing stellite surfacing on a plug area and a non-plug area of a surface to be surfaced;
and D, turning the plug area after stellite overlaying, wherein the large end of the T-shaped plug is turned, and the large end of the plug is exposed out of the cleaned contour.
Further, in order to better perform stellite surfacing, the plug arranged in the step A is a T-shaped and/or spherical plug, the plug is provided with a large end which is higher than the surface to be surfaced by a certain size, and the diameter of the small end of the plug is smaller than that of the pumping and exhausting hole.
Further, in order to ensure the stellite overlaying performance of the inner hole of the valve core and improve the welding efficiency, the step of stellite overlaying in the plug area further comprises the following steps C1 and D1:
step C1, the plug is higher than the surfacing surface by a certain size, when the welding arc moves to the plug, the arc length of the arc becomes short, and the height of the welding gun can be automatically adjusted by the operating machine system according to the arc length of the arc to meet the requirement of continuing welding, and the plug part is a spherical surface after surfacing and the spherical surface is convex;
step D1, wherein step D1 is: after the whole inner hole stellite is welded by using the operation, the spherical surface is turned by a lathe, the hard stellite alloy at the position of the plug is completely removed, and a clear outline of the large end of the plug is exposed, wherein the outline is larger than the size of the exhaust hole or the extraction hole, so that the stellite welding layer can not crack in the process of machining the hole.
Further, in order to ensure stellite overlaying performance of the inner hole of the valve core and improve welding efficiency, the step of stellite overlaying in the plug area further comprises the following step C2:
wherein, the step C2: the operator manually turns off the welding current immediately without welding, and when the workpiece rotates and rotates past the plug, the operator manually arcs and continues stellite surfacing welding, so that a hard stellite welding layer is avoided at the position of the plug.
Further, the stellite surfacing method of the inner hole of the valve core can be used for stellite surfacing or repairing of the valve core part of the steam turbine valve; in addition, the valve core component can be used for stellite surface overlaying of valve core components (new products and old products) of units such as nuclear turbines, thermal turbines, industrial turbines and the like so as to improve the oxidation resistance and high-temperature friction and wear resistance of the valve core component.
Further, in step C2, step E follows, wherein step E is a drilling step of the large end of the plug.
Furthermore, the plug is T-shaped, the right side L of the large end of the plug is larger than the left side L of the large end of the plug, the height H of the edge of the plug is larger than the thickness delta of the surfacing, the height H is determined by the process, and the surface of the large end of the plug is a spherical surface; the diameter of the small end of the plug is smaller than that of the exhaust hole, and the number of the plugs is a plurality according to the number of the holes.
Meanwhile, the technical solution of the present invention also provides a repair system and a repair process, wherein the repair system comprises: the device comprises powder plasma surfacing equipment with an arc pressure adjusting function, a special plug (T-shaped and/or spherical plug), an argon arc welding machine, an electric grinding tool and a PT detection reagent.
The repair system can complete the following repair process or method, which is specifically as follows:
1) preparing a plug;
2) detecting a valve core component;
3) installing and welding a plug; meanwhile, after the plug is arranged in the hole and the welding of the fixed angle welding seam of the plug is finished, polishing to smooth transition;
4) and (4) PT detection: PT detection is carried out on the welding line of the plug, and defect-free display is carried out;
5) welding: and clamping the workpiece on an operation positioner, and preheating. The arc regulator was turned on and confirmed to be normal. After the preheating temperature meets the technological requirements, starting a welding machine for welding, and performing a spiral line welding procedure;
6) and (3) heat treatment: after welding, immediately loading the workpiece into a furnace for corresponding heat treatment;
7) and (4) PT detection: performing PT detection after heat treatment to confirm that the surfacing layer is intact;
8) processing: clamping to a lathe, adjusting the rotating speed, completing machining by feeding a small amount of tools, and performing PT self-inspection when the inner hole surface stellite layer is machined to delta + 0.3;
9) and (5) turning to a drilling process without defects.
Meanwhile, the technical solution of the present invention also provides another repair process or method, which is a powder plasma welding machine, a plug, a workpiece and a polishing tool without (or with) an arc pressure regulator, and specifically comprises the following steps:
1) preparing a plug: preparing a plug according to the valve disc, determining the plug H according to the process, and determining the left and right sizes of L according to the process requirements; then preparing a plurality of plugs made of the same material as the valve core component according to a plug processing technology;
2) detecting a valve element component: cleaning the area of the assembling part of the plug, and displaying the defect-free assembling part of the plug by PT detection;
3) installing and welding a plug: the exhaust hole is inclined and intersected with the surface of the inner hole of the surfacing, so that the plug is installed as shown in the second embodiment; at this time, the stopper is not welded, so that the stopper is fixed only by spot welding (or circumferential sealing welding); the welding material is a welding material for high-temperature oxidation resistance. The operator visually judges the time of arc extinction and arc striking; even if the timing is slightly inaccurate, the burning and collapsing of the edge of the extraction hole cannot be influenced;
4) and (4) PT detection: PT detection is carried out on the welding line of the plug, and defect-free display is carried out;
5) welding: and clamping the workpiece on an operation positioner, and preheating. The arc regulator was turned on and confirmed to be normal. After the preheating temperature meets the technological requirements, starting a welding machine for welding, and performing a spiral line welding procedure;
6) and (3) heat treatment: after welding, immediately loading the workpiece into a furnace for corresponding heat treatment;
7) and (4) PT detection: performing PT detection after heat treatment to confirm that the surfacing layer is intact;
8) taking a plug: and polishing the welding line to remove the plug.
The invention has the beneficial effects that:
1. the automatic surfacing method is introduced by presetting two areas, namely a plug area and a non-plug area and using a reasonable plug, such as a novel T-shaped plug, so that the problems of poor quality and low percent of pass of porous surface surfacing are easily solved.
2. The invention also improves the convenience of drilling and greatly shortens the occupation time of the machine tool. Otherwise, the operation amount of the machine tool can be greatly increased by drilling on the Stellite (the feed amount is small, the rotating speed is high, and the drilling efficiency is low), and the valve core component has important significance for relieving the pressure of the machine tool particularly when the valve core component is produced in batches.
3. The invention provides reliable support for the upgrading surfacing of subsequent repaired parts and the design of a new porous surface valve core part.
Drawings
FIG. 1 is a schematic view of the principle of the porous inner circular surface build-up welding;
FIG. 2 is a schematic view of the valve core member and the plug;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
reference numbers in the figures: 1-air extraction hole (exhaust hole), 2-T-shaped plug, 3-plug fixed fillet weld, 4-surfacing layer and 5-surface to be surfaced.
Detailed Description
The valve core stellite surfacing method disclosed by the invention is based on a process of drilling and then plugging the hole, and has higher reliability compared with a process of drilling directly, then manually welding, directly welding and then drilling.
See fig. 1, 2, 3
The stellite surfacing method for the porous sliding surface of the valve core comprises
The method comprises the following steps:
step A, dividing a surface 5 to be subjected to surfacing welding of an inner hole of a valve core into a plug area and a non-plug area in advance, wherein the plug area is an area of an extraction hole 1 (or an exhaust hole) to be subjected to surfacing welding, the plug area is provided with a plug 2 for plugging the extraction hole or the exhaust hole, and the plug 2 is provided with a large end and a small end;
step B, before stellite surfacing is carried out on the choke plug area, spot welding and fixing are firmly completed by using welding materials which are the same as the valve core component or resistant to high-temperature oxidation, and the fillet weld 3 is polished and smoothly transited;
step C, performing stellite surfacing on a plug area and a non-plug area of the surfacing surface 5 to be surfaced;
and D, turning the plug area after stellite overlaying, wherein the large end of the T-shaped plug 2 is turned, and the large end of the plug 2 is exposed out of the cleaned outline.
In order to better perform stellite surfacing, the plug 2 arranged in the step A is a T-shaped and/or spherical plug, the large end of the plug 2 is higher than the surface 5 to be surfaced by a certain size, and the diameter of the small end of the plug 2 is smaller than that of the exhaust hole 1.
In order to ensure the stellite overlaying performance of the inner hole of the valve core and improve the welding efficiency, the step of stellite overlaying in the plug area further comprises the following steps C1 and D1:
step C1, the plug 2 is higher than the surfacing surface 5 by a certain size, when the welding arc moves to the plug 2, the arc length of the arc is shortened, and the height of the welding gun can be automatically adjusted by the operating machine system according to the arc length so as to meet the requirement of continuous welding, and the plug part is a spherical surface after surfacing and the spherical surface is convex;
and D1, after the whole inner hole is welded by the operation, turning the spherical surface by a lathe, completely removing the hard stellite alloy at the plug to expose a clear outline of the large end of the plug, wherein the outline is larger than the size of the vent hole 1 (or the extraction hole), so that the stellite overlaying layer 4 cannot be cracked in the process of machining the hole.
In order to ensure stellite overlaying performance of the inner hole of the valve core and improve welding efficiency, the step of stellite overlaying is carried out in the plug area, and the method further comprises the following step C2:
step C2: when the workpiece rotates and rotates through the plug 2, the operator manually arcs and then continues stellite surfacing welding; this avoids the hard stellite weld layer at the plug location.
The stellite surfacing method of the inner hole of the valve core can be used for stellite surfacing or repairing of the valve core part of the steam turbine valve; in addition, the valve core component can be used for stellite surface overlaying of valve core components (new products and old products) of units such as nuclear turbines, thermal turbines, industrial turbines and the like so as to improve the oxidation resistance and high-temperature friction and wear resistance of the valve core component.
In step C2, step E follows, wherein step E is a step of drilling the large end of the plug.
The plug 2 is T-shaped, the right side L of the large end of the plug 2 is larger than the left side L of the left end, the edge height H of the plug 2 is larger than the build-up welding thickness delta, the height H is determined by a process, and the surface of the large end of the plug 2 is a spherical surface; the diameter of the small end of the plug 2 is smaller than that of the exhaust hole 1, and the number of the plugs is a plurality according to the number of the holes.
Example 1, see figure 1:
a stellite surfacing repair method comprises the following steps:
the novel valve core piece surfacing (pumping and exhausting holes are uniformly distributed around a large inner hole to be surfaced and intersected with the large inner hole of the valve core surfacing in an inclined mode) method comprises the steps of machining a T-shaped plug 2 in advance, wherein the plug 2 is T-shaped, the right side L of the large end of the plug 2 is larger than the left side L of the large end of the plug 2, the edge height H of the plug 2 is larger than the surfacing thickness delta, the height H is determined by the process, and the surface of the large end of the plug 2 is a spherical surface, which is shown in figure 1. The diameter of the small end of the plug 2 is smaller than that of the pumping and exhausting hole 1, and the number of the plugs is prepared according to the number of the holes.
The repair system of the invention comprises: the device comprises powder plasma surfacing equipment with an arc pressure adjusting function, a special plug (T-shaped and/or spherical plug), an argon arc welding machine, an electric grinding tool, a PT detection reagent and the like.
The repair process comprises the following steps:
1) preparing a plug: and the plug is processed by adopting the material which is the same as the valve core piece. The plug 2 is T-shaped, the right side L right of the large end of the plug is larger than the left side L left of the left end, the height H of the edge of the plug is larger than the build-up welding thickness delta, the height H is determined by the process, the surface of the large end of the plug is spherical, the diameter of the small end of the plug is smaller than that of the exhaust hole 1, and the number of the plugs 2 is prepared according to the number of the holes 1.
2) Detecting a valve element component: and cleaning the area of the assembling part of the plug, and displaying the defect-free assembling part of the plug by PT detection.
3) Installing and welding a plug: because the exhaust hole 1 is inclined and intersected with the surface of the inner hole of the surfacing, the plug 2 is installed as shown in figure 1:
and after the plug 2 is arranged in the hole and the welding of the plug fixed angle welding seam 3 is finished, polishing to smooth transition. The welding material is used for high-temperature oxidation resistance.
4) And (4) PT detection: and (5) carrying out PT detection on the welding line of the plug, and displaying the welding line without defects.
5) Welding: and clamping the workpiece on an operation positioner, and preheating. The arc regulator was turned on and confirmed to be normal. And when the preheating temperature meets the technological requirements, starting a welding machine for welding, and performing a spiral line welding procedure.
6) And (3) heat treatment: and immediately loading the workpiece into a furnace for corresponding heat treatment after welding.
7) And (4) PT detection: after the heat treatment, PT detection was performed to confirm that the build-up layer 4 was intact.
8) Processing: and clamping the workpiece to a lathe, adjusting the rotating speed, feeding a small amount of tool to finish machining, and performing PT self-inspection when the inner hole surface stellite layer is machined to delta + 0.3. Transferring to a drilling process without defects
Example 2, see fig. 2, 3:
another stellite surfacing repair method comprises:
powder plasma welders, plugs, workpieces, grinding tools, etc., without (or with) an arc pressure regulator.
1) Preparing a plug: and preparing a plug 1 according to the valve disc, determining a plug H according to the process, and determining the left and right sizes of L according to the process requirements. And then preparing a plurality of plugs made of the same material as the valve core component according to a plug processing technology. The schematic structural diagrams of the valve core piece are shown in fig. 2 and 3.
2) Detecting a valve element component: and cleaning the area of the assembling part of the plug, and displaying the defect-free assembling part of the plug by PT detection.
3) Installing and welding a plug 2: because the exhaust hole 1 is inclined to intersect with the inner bore surface of the build-up welding, the plug 2 is installed as shown in fig. 2 and 3. At this time, no Stellite is welded on the plug 2, so that the plug 2 only needs to be fixed by spot welding (circumferential sealing can also be used). The welding material is a welding material for high-temperature oxidation resistance. The operator visually judges the time of arc quenching and arc striking. Even if the timing is slightly inaccurate, the burning collapse of the edge of the extraction hole 1 is not influenced.
4) And (4) PT detection: and (5) carrying out PT detection on the welding line of the plug, and displaying the welding line without defects.
5) Welding: and clamping the workpiece on an operation positioner, and preheating. The arc regulator was turned on and confirmed to be normal. And when the preheating temperature meets the technological requirements, starting a welding machine for welding, and performing a spiral line welding procedure.
6) And (3) heat treatment: and immediately loading the workpiece into a furnace for corresponding heat treatment after welding.
7) And (4) PT detection: after the heat treatment, PT detection was performed to confirm that the build-up layer 4 was intact.
8) Taking a plug: and polishing the welding line to remove the plug. If the circumference sealing welding of the plug 1 is carried out, the plug is directly clamped to a drilling machine, and the plug material is removed by adjusting the drill.
Claims (9)
1. A stellite surfacing method for a porous sliding surface of a valve core is characterized by comprising the following steps:
step A, dividing a surface to be subjected to surfacing welding of an inner hole of a valve core into a plug area and a non-plug area in advance, wherein the plug area is an extraction hole or an exhaust hole area to be subjected to surfacing welding, the plug area is provided with a plug for plugging the extraction hole or the exhaust hole, and the plug is provided with a large end and a small end;
step B, before stellite surfacing is carried out on the choke plug area, spot welding and fixing are firmly completed by using welding materials which are the same as the valve core component or resistant to high-temperature oxidation, and fillet welds are polished to be smooth and transited;
step C, performing stellite surfacing on a plug area and a non-plug area of a surface to be surfaced;
and D, turning the plug area after stellite overlaying, wherein the large end of the T-shaped plug is turned, and the large end of the plug is exposed out of the cleaned contour.
2. The stellite bead welding method of the porous sliding surface of the valve element according to claim 1, wherein: the plug arranged in the step A is a T-shaped and/or spherical plug, the plug is provided with a large end which has a certain size higher than the surface to be welded, and the diameter of the small end of the plug is smaller than that of the pumping and exhausting hole.
3. The stellite overlay method of a porous sliding surface of a valve element according to claim 1 or 2, wherein:
the step of stellite surfacing of the plug area further comprises the following steps C1 and D1:
step C1, the plug is higher than the surfacing surface by a certain size, when the welding arc moves to the plug, the arc length of the arc is shortened, the height of the welding gun is automatically adjusted by the operating machine system according to the arc length of the arc so as to meet the requirement of continuing welding, and the plug part is a spherical surface after surfacing and the spherical surface is convex;
step D1, wherein step D1 is: after the whole inner hole is welded by the operation, the spherical surface is turned by a lathe, the hard stellite alloy at the position of the plug is completely removed, and a clear outline of the large end of the plug is exposed, wherein the outline is larger than the size of the exhaust hole or the extraction hole.
4. The stellite overlay method of a porous sliding surface of a valve element according to claim 1 or 2, wherein:
the step of stellite surfacing of the plug area further comprises the following step C2:
step C2: the operator manually turns off the welding current immediately without welding, and when the workpiece rotates and rotates past the plug, the operator manually arcs and continues stellite surfacing welding, so that a hard stellite welding layer is avoided at the position of the plug.
5. The stellite bead welding method of the porous sliding surface of the valve element according to claim 4, wherein: the stellite surfacing method of the inner hole of the valve core is used for stellite surfacing or repairing of a valve core part of a steam turbine valve, or stellite surfacing of valve core parts of nuclear turbines, thermal turbines and industrial turbine units.
6. The stellite bead welding method of the porous sliding surface of the valve element according to claim 4, wherein: in step C2, step E follows, wherein step E is a step of drilling the large end of the plug.
7. The stellite overlay method of a porous sliding surface of a valve element according to claim 1 or 2, wherein: the end cap is T-shaped, the right side L of the large end of the end cap is larger than the left side L of the large end of the end cap, the edge height H of the end cap is larger than the build-up welding thickness delta, the height H is determined by a process, and the surface of the large end of the end cap is a spherical surface; the diameter of the small end of each plug is smaller than that of the exhaust hole, and the number of the plugs is a plurality according to the number of the holes.
8. A stellite surfacing repair system is characterized in that: the repair system includes: the device comprises powder plasma surfacing equipment with an arc pressure adjusting function, a T-shaped plug, an argon arc welding machine, an electric grinding tool and a PT detection reagent.
9. A stellite surfacing repair method is characterized by comprising the following steps:
1) preparing a plug;
2) detecting a valve core component;
3) installing and welding a plug; meanwhile, after the plug is arranged in the hole and the welding of the fixed angle welding seam of the plug is finished, polishing to smooth transition;
4) and (4) PT detection: PT detection is carried out on the welding line of the plug, and defect-free display is carried out;
5) welding: clamping a workpiece on an operation positioner, preheating, opening an arc pressure regulator and confirming the arc pressure regulator to be normal, starting a welding machine to weld when the preheating temperature meets the process requirement, and performing a spiral line welding procedure;
6) and (3) heat treatment: after welding, immediately loading the workpiece into a furnace for corresponding heat treatment;
7) and (4) PT detection: performing PT detection after heat treatment to confirm that the surfacing layer is intact;
8) processing: clamping to a lathe, adjusting the rotating speed, completing machining by feeding a small amount of tools, and performing PT self-inspection when the inner hole surface stellite layer is machined to delta + 0.3;
9) and (5) turning to a drilling process without defects.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114932374A (en) * | 2022-04-06 | 2022-08-23 | 豪利机械(苏州)有限公司 | Pressure cap machining and welding process |
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| CN112317929A (en) * | 2020-11-05 | 2021-02-05 | 上海宝冶工程技术有限公司 | Hole plugging welding process |
| CN113231788A (en) * | 2021-06-03 | 2021-08-10 | 上海电力股份有限公司吴泾热电厂 | On-site repairing method for sealing surface of valve seat of in-service safety valve |
| CN214975024U (en) * | 2021-03-09 | 2021-12-03 | 湖北浩瀚佰金光电科技有限公司 | Spraying shielding jig |
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| CN110449848A (en) * | 2019-09-23 | 2019-11-15 | 沈阳三科核电设备制造股份有限公司 | A kind of processing technology of built-up welding Si Taili hard alloy thin-walled set |
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| CN214975024U (en) * | 2021-03-09 | 2021-12-03 | 湖北浩瀚佰金光电科技有限公司 | Spraying shielding jig |
| CN113231788A (en) * | 2021-06-03 | 2021-08-10 | 上海电力股份有限公司吴泾热电厂 | On-site repairing method for sealing surface of valve seat of in-service safety valve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114932374A (en) * | 2022-04-06 | 2022-08-23 | 豪利机械(苏州)有限公司 | Pressure cap machining and welding process |
| CN114932374B (en) * | 2022-04-06 | 2024-01-23 | 豪利机械(苏州)有限公司 | Pressure cap processing and welding process |
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| CN114226937B (en) | 2023-08-18 |
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