CN105290564A - Sealing face surfacing method of nuclear power station pressure releasing valve - Google Patents
Sealing face surfacing method of nuclear power station pressure releasing valve Download PDFInfo
- Publication number
- CN105290564A CN105290564A CN201510760965.5A CN201510760965A CN105290564A CN 105290564 A CN105290564 A CN 105290564A CN 201510760965 A CN201510760965 A CN 201510760965A CN 105290564 A CN105290564 A CN 105290564A
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- Prior art keywords
- welding
- sealing surface
- control device
- nuclear power
- temperature control
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Classifications
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
The invention discloses a sealing face surfacing method of a nuclear power station pressure releasing valve. The method comprises the steps that firstly, a heating belt is wound on the to-be-surfaced surface of a component of the pressure releasing valve, the heating belt is connected with a thermal treatment temperature control device, and the component is wrapped by insulation cotton; secondly, the heating belt is heated by starting the thermal treatment temperature control device till the to-be-surfaced sealing face of the component is preheated to the preset temperature; thirdly, surfacing is carried out on the to-be-surfaced sealing face of the component wrapped by the insulation cotton through a welding device; and fourthly, after welding, the thermal treatment temperature control device is stopped, and the component wrapped by the insulation cotton is naturally cooled. By means of the thermal treatment temperature control device, preheating and surfacing are carried out on the whole component through winding of the heating belt and wrapping of the insulation cotton, natural cooling is carried out still through the insulation cotton wrapping manner after welding, and therefore during preheating, the temperature evenly reaches the preset temperature to the greatest extent, the temperature can be kept to the greatest extent during surfacing, and during cooling, the cooling speed can be effectively lowered.
Description
Technical field
The present invention relates to welding procedure, particularly relate to a kind of nuclear power station pressure relief valve sealing surface weld deposit method.
Background technology
Nuclear power station valve, especially core one-level super design reference pressure relief valve are the key equipments guaranteeing reactor safety when accident occurs.Its Main Function is when major accident occurs, and can carry out pressure release in time, avoid the generation of high-voltage fuse heap accident, maintained the integrality of primary Ioops equipment, and prevented the leakage of radioactive substance before pressure vessel loses efficacy.The parts of core one-level super design reference pressure relief valve complex structure, spaces compact, different function requirements, seal face materials and the material of harsh operating condition and the Problem of Failure etc. of weld seam are all had higher requirement to the overlaying process of sealing surface (comprising spigot surface, anti-corrosion face).
The built-up welding of sealing face of nuclear power valve is due to the restriction of dimensional space and the requirement in performance and life-span, general manual argon arc welding, the SMAW built-up welding cobalt base hard alloy adopting maturation more, but because cobalt element is easily activated under radiation environment, therefore in the primary Ioops equipment of Generation Ⅲ, be strictly limited use.Also the application adopting the Ni-based or ferrous alloy of conventional soldering techniques built-up welding is had; also there is the special welding technique (the high sealing gas protection welding process as nuclear power bellows stop valve) for particular core electric valve, but be all not exclusively applicable to the sealing surface weld deposit occasion of core one-level super design reference pressure relief valve.
Due to the impact of the thickness, trace element etc. by the hardness (such as adopt conventional soldering techniques built-up welding Ni-based) of core one-level super design reference pressure relief valve physical dimension, nickel-base alloy, mother metal thermal conductivity, linear expansion coefficient, built-up welding parts, the welding procedure of routine is not exclusively applicable to the sealing surface weld deposit of core one-level super design reference pressure relief valve.Its deficiency is mainly manifested in:
1) insulation, in welding process and Temperature Control Measures deficiency;
2) control, for postheating speed is not enough.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provides a kind of nuclear power station pressure relief valve sealing surface weld deposit method.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of nuclear power station pressure relief valve sealing surface weld deposit method, described method comprises:
S1, heating tape is wrapped in pressure relief valve treat welding part surface, described heating tape connects heat treatment temperature control device, then wraps up part by heat-preservation cotton;
S2, start heat treatment temperature control device heating tape heated, until part treat that built-up welding sealing surface is preheated to predetermined temperature;
S3, utilize welding equipment to be enclosed with heat-preservation cotton part treat built-up welding sealing surface weld deposit;
S4, postwelding close heat treatment temperature control device, are naturally cooled by the part being enclosed with heat-preservation cotton.
In nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, described step S1 comprises:
S11, the thermocouple be connected with heat treatment temperature control device is attached on the surface of part main body, heating tape is wrapped in part outer surface and envelopes thermocouple;
The free end of heating tape is also connected with heat treatment temperature control device by S12;
S13, adopt heat-preservation cotton parcel to treat the part of built-up welding, and expose this part treat built-up welding sealing surface.
In nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, described step S2 comprises:
S21, startup heat treatment temperature control device heat heating tape, and thermocouple Real-time Feedback temperature signal is to heat treatment temperature control device;
S22, in the process heated heating tape, heat treatment temperature control device judges whether the temperature signal that thermocouple feeds back reaches preset temperature signals, and to the heating stopped during preset temperature signals heating tape, performs step S3.
In nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, described heating tape is ceramic heat band.
In nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, described heat-preservation cotton is the heat-preservation cotton that rock wool fibers is made.
In nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, in described step S3, the resurfacing welding material of sealing surface adopts carbide alloy of nickel-base material.
In nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, when having welded in described step S3 and received arc, arc crater to be guided to outside overlaying surface and delay and supply gas, arc crater is filled up.
In nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, during multiple-bead deposit, under welding during one deck, adopt the temperature of infrared thermometer to sealing surface to monitor, and proceed the welding of lower one deck when interlayer temperature is in the interlayer temperature preset.
In nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, also comprise after described step S4: carry out hammering, to reduce residual stress and diffusible hydrogen content in the position of receiving arc.
Implement nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, there is following beneficial effect: the present invention adopts heat treatment temperature control device, mode in conjunction with heating tape winding, heat-preservation cotton parcel carries out preheating, built-up welding to part entirety, and carry out nature cooling in the mode that postwelding still adopts heat-preservation cotton to wrap up, therefore temperature can be made to reach predetermined temperature equably when preheating as far as possible, temperature being kept when built-up welding as far as possible, effectively can alleviate the speed of cooling when cooling; Further, consider the worst hot case of core one-level super design reference pressure relief valve, the present invention adopts nickel-base alloy as sealing surface weld deposit material, and it has stronger high-temperature behavior.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the view of the present invention when preheating;
Fig. 2 is the flow chart of nuclear power station pressure relief valve sealing surface weld deposit method of the present invention.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in Figure 2, be the flow chart of nuclear power station pressure relief valve sealing surface weld deposit method of the present invention.
Normally utilize flame directly to carry out local preheating to the surface of welding in prior art, this preheating method easily occur when preheating area is too small preheating not in place cause until built-up welding position lower the temperature too fast defect, the requirement of minimum preheat temperature cannot be met again when preheating area is larger.
Nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, main method comprises following basic step:
S1, as shown in Figure 1, heating tape 200 is wrapped in the surface for the treatment of the part of built-up welding of pressure relief valve, then described heating tape 200 is connected heat treatment temperature control device 100, then wrap up part by heat-preservation cotton 300;
Wherein, heat treatment temperature control device 100 can directly from buying on the market, and such as the present invention is exactly the program heat treatment temperature control device of the WCK-60KW bought.
Wherein, described heating tape 200 is ceramic heat band 200, and its inside is copper core.
The heat-preservation cotton 300 that described heat-preservation cotton 300 is made for rock wool fibers, rock wool fibers can avoid high-temp combustion, is a kind of desirable insulation material.
S2, preheating:
The present invention is not directly to sealing surface preheating, but after the process of step S1, starts heat treatment temperature control device 100 and heat heating tape 200, realizes pressure relief valve to treat that the part entirety of built-up welding carries out even preheating, such as, be generally 300 DEG C.
Before preheating, the preset temperature of heat treatment temperature control device 100 can be set, the heating to heating tape 200 is stopped when so heat treatment temperature control device 100 will be preheating to preset temperature, but heat treatment temperature control device 100 or in running order, the temperature of its Real-Time Monitoring thermocouple 110 feedback, once temperature is lower than preset temperature, continues to heat heating tape 200.Preset temperature requires setting according to actual welding, is not limited to 300 DEG C, according to circumstances determines, do not limit this.
Due to part be wound around by heating tape 200, cotton 300 parcels of insulation, temperature therefore can be made to reach predetermined temperature equably when preheating as far as possible.Solve preheating problem of non-uniform of the prior art.
S3, welding:
Adopt welding equipment to be enclosed with heat-preservation cotton 300 part treat built-up welding sealing surface weld deposit.In welding process, heat treatment temperature control device 100 still keeps duty, as long as Part temperature reduces, then again heating tape 200 is heated, add cotton 300 parcels of part insulation, therefore can keep original temperature when built-up welding as far as possible, be unlikely to the temperature requirement not reaching built-up welding due to the fast cooling of part entirety.
Other technological parameters in welding process can set according to demand, for the welding of the part of core one-level super design reference pressure relief valve, generally adopt gas tungsten arc welding, electric current 140 ~ 160A, voltage 15 ~ 20V.
S4, cooling:
Postwelding closes heat treatment temperature control device 100, does not remove heat-preservation cotton 300, but is naturally cooled by the part being enclosed with heat-preservation cotton 300, therefore, effectively can alleviate the speed of cooling when cooling.
Concrete, described step S1 comprises:
S11, the thermocouple 110 be connected with heat treatment temperature control device 100 is attached on the surface of part main body, heating tape 200 is wrapped in part outer surface and envelopes thermocouple, namely thermocouple 110 is arranged between the surface of part main body and heating tape 200, therefore can gather the temperature of piece surface;
S12, the free end of heating tape 200 to be connected with heat treatment temperature control device 100;
S13, adopt heat-preservation cotton 300 parcel to treat the part of built-up welding, and expose this part treat built-up welding sealing surface.
Concrete, described step S2 comprises:
S21, startup heat treatment temperature control device 100 pairs of heating tapes 200 are heated, and thermocouple 110 Real-time Feedback temperature signal is to heat treatment temperature control device 100;
S22, in the process heated heating tape 200, heat treatment temperature control device 100 judges whether the temperature signal that thermocouple 110 feeds back reaches preset temperature signals, and to the heating stopped during preset temperature signals heating tape 200, performs step S3.
Heat treatment temperature control device 100 is natively supporting is provided with thermocouple 110, it is connected with the control panel in heat treatment temperature control device 100, and be close to piece surface, therefore the control panel in heat treatment temperature control device 100 can obtain piece surface temperature in time, can stop heating and reminding operating personnel when temperature arrives preset temperature.
Preferably, the material of built-up welding in described step S3 adopts carbide alloy of nickel-base material.Because the high-temperature behavior of carbide alloy of nickel-base material is better than existing weldering cobalt base hard alloy.Adopt carbide alloy of nickel-base material although also have in prior art, the hardness of nickel-base alloy is higher, and prior art adopts conventional bead-welding technology, and temperature controls not, as easy as rolling off a logly in overlay-operation cracks, so it cannot reach built-up welding requirement.
Preferably, when having welded in described step S3 and received arc, arc crater to be guided to outside overlaying surface and to delay supply gas (generally delaying the switch controlled on welding gun, time general 5 ~ 6s), and arc crater is filled up, avoid producing crater crack at the sealing surface of built-up welding.
In addition, when multiple-bead deposit, under welding during one deck, adopt the temperature of infrared thermometer to sealing surface to measure, have do not reach described preset temperature to detect overlaying surface.Because can not ensure at the end of preheating that the temperature of the regional of part is completely the same completely, so treat built-up welding sealing surface, likely temperature is too high, if temperature exceeds described preset temperature, wait for that sealing surface cools in welding after suitable temperature (namely within described preset temperature), to meet welding process requirement.
Preferably, also comprise after described step S4: carry out hammering, to reduce residual stress and diffusible hydrogen content in the position of receiving arc.
In sum, implement nuclear power station pressure relief valve sealing surface weld deposit method of the present invention, there is following beneficial effect: the present invention adopts heat treatment temperature control device, mode in conjunction with heating tape winding, heat-preservation cotton parcel carries out preheating, built-up welding to part entirety, and carry out nature cooling in the mode that postwelding still adopts heat-preservation cotton to wrap up, therefore temperature being made when preheating as far as possible to reach predetermined temperature equably, temperature can be kept when built-up welding as far as possible, effectively can alleviate the speed of cooling when cooling; Further, consider the worst hot case of core one-level super design reference pressure relief valve, the present invention adopts nickel-base alloy as sealing surface weld deposit material, and it has stronger high-temperature behavior.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (9)
1. a nuclear power station pressure relief valve sealing surface weld deposit method, is characterized in that, described method comprises:
S1, heating tape is wrapped in pressure relief valve treat welding part surface, described heating tape connects heat treatment temperature control device, then wraps up part by heat-preservation cotton;
S2, start heat treatment temperature control device heating tape heated, until part treat that built-up welding sealing surface is preheated to predetermined temperature;
S3, welding equipment is utilized to treat built-up welding sealing surface weld deposit to what be enclosed with heat-preservation cotton part;
S4, postwelding close heat treatment temperature control device, are naturally cooled by the part being enclosed with heat-preservation cotton.
2. nuclear power station pressure relief valve sealing surface weld deposit method according to claim 1, it is characterized in that, described step S1 comprises:
S11, the thermocouple be connected with heat treatment temperature control device is attached on the surface of part main body, heating tape is wrapped in part outer surface and envelopes thermocouple;
S12, the free end of heating tape to be connected with heat treatment temperature control device;
S13, adopt heat-preservation cotton parcel to treat the part of built-up welding, and expose this part treat built-up welding sealing surface.
3. nuclear power station pressure relief valve sealing surface weld deposit method according to claim 2, it is characterized in that, described step S2 comprises:
S21, startup heat treatment temperature control device heat heating tape, and thermocouple Real-time Feedback temperature signal is to heat treatment temperature control device;
S22, in the process heated heating tape, heat treatment temperature control device judges whether the temperature signal that thermocouple feeds back reaches preset temperature signals, and to the heating stopped during preset temperature signals heating tape, performs step S3.
4. nuclear power station pressure relief valve sealing surface weld deposit method according to claim 1, it is characterized in that, described heating tape is ceramic heat band.
5. nuclear power station pressure relief valve sealing surface weld deposit method according to claim 1, it is characterized in that, described heat-preservation cotton is the heat-preservation cotton that rock wool fibers is made.
6. nuclear power station pressure relief valve sealing surface weld deposit method according to claim 1, is characterized in that, in described step S3, the resurfacing welding material of sealing surface adopts carbide alloy of nickel-base material.
7. nuclear power station pressure relief valve sealing surface weld deposit method according to claim 1, is characterized in that, when having welded in described step S3 and received arc, to be guided to by arc crater outside overlaying surface and delays and supply gas, filled up by arc crater.
8. nuclear power station pressure relief valve sealing surface weld deposit method according to claim 7, it is characterized in that, during multiple-bead deposit, under welding during one deck, adopt the temperature of infrared thermometer to sealing surface to monitor, and proceed the welding of lower one deck when interlayer temperature is in the interlayer temperature preset.
9. nuclear power station pressure relief valve sealing surface weld deposit method according to claim 7, is characterized in that, also comprise after described step S4: carry out hammering, to reduce residual stress and diffusible hydrogen content in the position of receiving arc.
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| CN201510760965.5A CN105290564A (en) | 2015-11-10 | 2015-11-10 | Sealing face surfacing method of nuclear power station pressure releasing valve |
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| CN201510760965.5A CN105290564A (en) | 2015-11-10 | 2015-11-10 | Sealing face surfacing method of nuclear power station pressure releasing valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110434425A (en) * | 2019-07-01 | 2019-11-12 | 宜昌船舶柴油机有限公司 | A kind of S60MC cylinder cover for diesel engine fuel oil jeting area overlaying method |
| CN112008208A (en) * | 2020-09-02 | 2020-12-01 | 中国电建集团山东电力建设第一工程有限公司 | Method for controlling welding temperature of steel structure in alpine region |
| CN113634953A (en) * | 2021-08-25 | 2021-11-12 | 无锡市福莱达石油机械有限公司 | Preheating and heat preservation method for valve seat |
| CN114131242A (en) * | 2021-12-24 | 2022-03-04 | 东方电气集团东方汽轮机有限公司 | Alloy material for surfacing layer of sealing surface of valve seat and welding process of alloy material |
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| CN110434425B (en) * | 2019-07-01 | 2022-06-03 | 宜昌船舶柴油机有限公司 | Surfacing welding method for fuel injection area of cylinder head of S60MC diesel engine |
| CN112008208A (en) * | 2020-09-02 | 2020-12-01 | 中国电建集团山东电力建设第一工程有限公司 | Method for controlling welding temperature of steel structure in alpine region |
| CN113634953A (en) * | 2021-08-25 | 2021-11-12 | 无锡市福莱达石油机械有限公司 | Preheating and heat preservation method for valve seat |
| CN114131242A (en) * | 2021-12-24 | 2022-03-04 | 东方电气集团东方汽轮机有限公司 | Alloy material for surfacing layer of sealing surface of valve seat and welding process of alloy material |
| CN114131242B (en) * | 2021-12-24 | 2023-08-25 | 东方电气集团东方汽轮机有限公司 | Alloy material for valve seat sealing surface overlaying layer and welding process thereof |
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Application publication date: 20160203 |