CN113909656A - Surfacing process and surfacing method for main pump shaft seal matching part - Google Patents
Surfacing process and surfacing method for main pump shaft seal matching part Download PDFInfo
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- CN113909656A CN113909656A CN202111503337.0A CN202111503337A CN113909656A CN 113909656 A CN113909656 A CN 113909656A CN 202111503337 A CN202111503337 A CN 202111503337A CN 113909656 A CN113909656 A CN 113909656A
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- welding
- surfacing
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- main pump
- stellite
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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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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a surfacing process and a surfacing method of a main pump shaft seal matching part, and relates to the technical field of plasma welding. The invention adopts PTA welding to carry out overlapped single strip multi-pass welding method, uses stellite alloy as welding material, at least 2 layers are welded on the surface of the welding part, the total thickness of the welded layer is 2.0-6.0mm, the total thickness of other layers except the first layer is at least 1.0mm, the welding speed is 60-80 mm/min, the welding current is 160-170A and the welding voltage is 20-22V when the first layer is welded, the welding current is 150-160A and the welding voltage is 18-20V when the other layers are welded. The surfacing process and the surfacing method of the main pump shaft seal matching part can improve the surfacing effect so that the surface of a welding part has high wear resistance.
Description
Technical Field
The invention relates to the technical field of plasma welding, in particular to a surfacing process and a surfacing method for a main pump shaft seal matching part.
Background
The main pump of the coolant system in the nuclear reactor is used for driving the coolant to circulate and take away the heat generated by the fission reaction. In the continuous running process of dynamic pressure shaft sealing of the main pump, parts such as a pump shaft, a pump bearing and the like need to maintain good sealing performance in the high-speed rotating process, and the parts in rotating fit with the sealing are also required to have high wear resistance.
At present, argon arc welding is generally adopted to carry out surfacing welding on the surfaces of a bearing body and a shaft sleeve which are in sealing running fit in a main pump, but the dilution rate of argon arc welding is high, so the process effect after surfacing welding is not ideal, the wear resistance of a sealing running fit part is not high, and the service life and the safety of main pump shaft sealing are influenced. A surfacing process for sealing a main pump shaft, which has a better surfacing effect and is more convenient and reliable, is sought after in the nuclear power industry in the world.
Disclosure of Invention
The invention aims to develop a surfacing process for improving a surfacing effect so as to enable the surface of a welding part to have high wear resistance and a surfacing method for a main pump shaft seal matching part.
The invention is realized by the following technical scheme:
a build-up welding process adopts PTA welding to carry out an overlapped single strip multi-pass welding method, Stellite is used as a welding material, at least 2 layers are built up on the surface of a welded part, the total thickness of the build-up welding is 2.0-6.0mm, the total thickness of other layers except a first layer is at least 1.0mm, the welding speed is 60-80 mm/min, the welding current is 160-170A and the welding voltage is 20-22V when the first layer is built up, and the welding current is 150-160A and the welding voltage is 18-20V when the other layers are built up.
Optionally, the stellite alloy is a powder having a powder size of 100-.
Optionally, the powder feeding rate of the welding material in the surfacing process is 15-23 g/min.
Optionally, the welding current is direct current, and the polarity of the current is positive.
Optionally, the shielding gas, the powder feeding gas and the central gas used in PTA welding are argon gas with a concentration of 99.99%, wherein the flow rate of the shielding gas is 18 ± 1L/min, the flow rate of the powder feeding gas is 2.1 ± 0.1L/min, and the flow rate of the central gas is 1.6 ± 0.1L/min.
Optionally, the type of the tungsten electrode adopted by the PTA welding is EWTh-2, the specification of the tungsten electrode is A5.12, and the diameter of the tungsten electrode is 4.0 mm.
Optionally, the welding piece is preheated before welding, and the preheating temperature is 300-.
Optionally, during the welding process, the interlayer temperature of the overlay layer is 550-600 ℃.
Optionally, the swing width of the welding gun is 5-8mm, and the distance between the welding gun and the welding part is 10-15 mm.
The surfacing method for the sealing matching part of the main pump shaft is used for surfacing the surface of the shaft sleeve and the surface of the bearing body by adopting the surfacing process, wherein the shaft sleeve adopts stellite 12 as a welding material, and the bearing body adopts stellite 6 as the welding material.
The invention has the beneficial effects that:
the method adopts PTA welding to carry out surfacing of the surface hard alloy on the shaft sleeve and the bearing body of the coolant system main pump in the nuclear reactor, and has higher and more stable performance indexes after surfacing of the shaft sleeve and the bearing body due to smaller surfacing dilution rate (compared with the conventional argon arc welding surfacing technology), so that the surface hardness and the wear resistance of the shaft sleeve and the bearing body are improved, and the method is suitable for a nuclear power station with harsh service environment and improves the operation safety of the nuclear power station main pump.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments may be modified in various different ways, without departing from the spirit or scope of the invention. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
The surface hardness indexes of the inner shaft sleeve and the bearing body of the main pump meet the design and construction rules of pressurized water reactor nuclear island mechanical equipment (RCC-M for short) and meet the indexes in the following table 1.
TABLE 1
| Build-up welding grade | Hardness index requirement |
| Grade 6 | 39～47 |
| 12 stage | 47～53 |
At present, hard alloy on the surfaces of a shaft sleeve and a bearing body of a main pump is generally subjected to surfacing welding by argon arc welding, and the process effect after surfacing welding is not ideal due to the high dilution rate of argon arc welding.
The 6 test pieces were subjected to welding tests using argon arc welding, and the welding parameters of argon arc welding are shown in table 2 below.
TABLE 2
After the test piece is subjected to surfacing welding by adopting the surfacing parameters in the table 2, 8 measuring points are selected on the test piece, and the hardness value of the test piece is the average value of the 8 measuring points.
After the 6 test pieces were argon arc welded, the hardness values are shown in table 3 below.
TABLE 3
Among 6 test pieces, 3 of the 6 test pieces adopt Stellite 6 as a welding material to carry out 6-level surfacing, and the other 3 test pieces adopt Stellite 12 as a welding material to carry out 12-level surfacing, wherein hardness indexes of the 6 test pieces do not meet the requirements of RCC-M.
The invention discloses a surfacing process and a surfacing method of a main pump shaft seal matching part.
The pre-welding preparation specifically comprises:
removing oil stains, rust and other impurities on the welding surface of the welding part;
preheating a welding piece before welding, wherein the preheating temperature is 300-350 ℃;
the stellite alloy is used as a welding material, the welding material is powder, and the powder size is 100-325mesh, wherein the shaft sleeve is made of the stellite alloy 12, and the bearing body is made of the stellite alloy 6;
the flow rate of the protective gas is 18 +/-1L/min, the flow rate of the powder feeding gas is 2.1 +/-0.1L/min, and the flow rate of the central gas is 1.6 +/-0.1L/min;
the model of the adopted tungsten electrode is EWTh-2, the specification of the tungsten electrode is A5.12, and the diameter of the tungsten electrode is 4.0 mm;
the welding current is direct current, the polarity of the direct current is positive, when the first layer is overlaid, the welding current is 160-170A, the welding voltage is 20-22V, when the other layers are overlaid, the welding current is 150-160A, and the welding voltage is 18-20V.
The welding operation specifically includes:
performing an overlapping single multi-pass welding process;
the number of the surfacing layers is at least 2;
the total thickness of the layers other than the first layer is at least 1.0 mm;
the total thickness of the surfacing layers is 2.0-6.0 mm;
after one layer is built up, machining the surface of the built-up layer is finished by using a steel wire brush for brushing and grinding, and then the next layer of built-up welding is carried out;
the interlayer temperature of the surfacing layer is 550-600 ℃;
the powder feeding speed is 15-23 g/min;
the welding speed is 60-80 mm/min;
the swing width of the welding gun is 5-8 mm;
the distance between the welding gun and the welding piece is 10-15 mm.
The post-weld treatment specifically comprises:
naturally cooling, and slowly cooling in sandy soil and vermiculite;
5 times of macroscopic detection and 50 times of microscopic detection are carried out on the section of the deposited metal;
carrying out nondestructive testing on the surface, and requiring no defect display such as cracks;
the hardness value is an average value of 8-10 measurement points on the evaluation test piece, and the hardness of 4 points is allowed to be inconsistent in the plurality of measurement points.
The welding tests were carried out on 6 test pieces by using the above PTA welding process, and the welding parameters of PTA welding are shown in table 4 below.
TABLE 4
After the test piece is subjected to surfacing welding by adopting surfacing welding parameters in the table 4, 8 measuring points are selected on the test piece, and the hardness value of the test piece is the average value of the 8 measuring points.
After 6 test pieces were subjected to PTA welding, the hardness values are shown in table 5 below.
TABLE 5
In 6 test pieces, 6-level surfacing is carried out on 3 of the 6 test pieces by adopting stellite 6 as a welding material, and 12-level surfacing is carried out on the other 3 test pieces by adopting stellite 12 as a welding material, wherein hardness indexes of the 6 test pieces meet the requirements of RCC-M.
The method adopts PTA welding to carry out surfacing of the surface hard alloy on the shaft sleeve and the bearing body of the coolant system main pump in the nuclear reactor, and has higher and more stable performance indexes after surfacing of the shaft sleeve and the bearing body due to smaller surfacing dilution rate (compared with the conventional argon arc welding surfacing technology), so that the surface hardness and the wear resistance of the shaft sleeve and the bearing body are improved, and the method is suitable for a nuclear power station with harsh service environment and improves the operation safety of the nuclear power station main pump.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (10)
1. A surfacing process is characterized in that a single-strip multi-pass welding method of overlaying is carried out by adopting PTA welding, Stellite is used as a welding material, at least 2 layers are surfaced on the surface of a welded part, the total thickness of surfacing is 2.0-6.0mm, the total thickness of other layers except a first layer is at least 1.0mm, the welding speed is 60-80 mm/min, the welding current is 160-170A and the welding voltage is 20-22V when the first layer is surfaced, the welding current is 150-160A and the welding voltage is 18-20V when other layers are surfaced.
2. The hardfacing process of claim 1, wherein the stellite is a powder having a powder size of 100-.
3. The build-up welding process according to claim 2, wherein the powder feeding rate of the welding material during the build-up welding process is 15 to 23 g/min.
4. The process of weld overlay according to claim 1, wherein the welding current is direct current and the polarity of the current is positive.
5. The bead welding process according to claim 1, wherein the shielding gas, the powder feeding gas and the center gas used in the PTA welding are argon gas of 99.99%, wherein the flow rate of the shielding gas is 18 ± 1L/min, the flow rate of the powder feeding gas is 2.1 ± 0.1L/min, and the flow rate of the center gas is 1.6 ± 0.1L/min.
6. The overlaying process according to claim 1, wherein the PTA welding uses a tungsten electrode of type EWTh-2, a tungsten electrode of size a5.12, and a tungsten electrode of diameter 4.0 mm.
7. The hardfacing process of claim 1, wherein the weldment is pre-heated prior to welding at a temperature of 300-350 ℃.
8. The build-up welding process according to claim 1, wherein the temperature between layers of the build-up welding layer during welding is 550-600 ℃.
9. The build-up welding process according to claim 1, wherein the swing width of the welding torch is 5 to 8mm, and the distance of the welding torch from the welded part is 10 to 15 mm.
10. A surfacing method for a main pump shaft seal matching part is characterized in that the surfacing process according to any one of claims 1 to 9 is adopted to carry out surfacing on the surface of a shaft sleeve and the surface of a bearing body, wherein the shaft sleeve adopts stellite 12 as a welding material, and the bearing body adopts stellite 6 as the welding material.
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|---|---|---|---|
| CN202111503337.0A CN113909656A (en) | 2021-12-10 | 2021-12-10 | Surfacing process and surfacing method for main pump shaft seal matching part |
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|---|---|---|---|
| CN202111503337.0A CN113909656A (en) | 2021-12-10 | 2021-12-10 | Surfacing process and surfacing method for main pump shaft seal matching part |
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Application publication date: 20220111 |