CN103817414A - Tungsten electrode argon arc hot wire surfacing technique of main pump motor shaft and flywheel - Google Patents
Tungsten electrode argon arc hot wire surfacing technique of main pump motor shaft and flywheel Download PDFInfo
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- CN103817414A CN103817414A CN201410053066.7A CN201410053066A CN103817414A CN 103817414 A CN103817414 A CN 103817414A CN 201410053066 A CN201410053066 A CN 201410053066A CN 103817414 A CN103817414 A CN 103817414A
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- 229910052786 argon Inorganic materials 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title abstract description 38
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title abstract description 7
- 229910052721 tungsten Inorganic materials 0.000 title abstract description 7
- 239000010937 tungsten Substances 0.000 title abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 163
- 239000007789 gas Substances 0.000 claims description 19
- NGONBPOYDYSZDR-UHFFFAOYSA-N [Ar].[W] Chemical compound [Ar].[W] NGONBPOYDYSZDR-UHFFFAOYSA-N 0.000 claims description 15
- 229910001120 nichrome Inorganic materials 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000010891 electric arc Methods 0.000 claims description 5
- 239000011229 interlayer Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 238000009659 non-destructive testing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 4
- 229910052759 nickel Inorganic materials 0.000 abstract 2
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000008021 deposition Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- B23K9/16—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
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/042—Built-up welding on planar 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
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
- B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
- B23K9/048—Built-up welding on three-dimensional surfaces on surfaces of revolution on cylindrical 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
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/124—Circuits or methods for feeding welding wire
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to a tungsten electrode argon arc hot wire surfacing technique of a main pump motor shaft and a flywheel, and aims to establish a novel welding technique used for surfacing a critical component shaft of a main pump motor and a flywheel. A more advanced tungsten electrode argon arc hot wire surfacing technique is adopted to preheat a welding wire for welding before entering a weld pool, so that melting efficiency and welding speed are obviously increased, hoe wire welding has good stirring effect on the weld pool, the tungsten electrode argon arc hot wire surfacing technique is more suitable for welding thick nonferrous metals with large surface tension such as nickel base alloy, as compared with traditional argon arc welding, and high-efficient and high-quality nickel base build-up welds can be acquired. The tungsten electrode argon arc hot wire surfacing technique has high engineering application value and profound social significance.
Description
Technical field: the present invention relates to a kind of main pump motor axle and flywheel tungsten argon arc hot wire welding bead-welding technology.
Background technology: the integrality of main pump motor has important impact to the safe operation in a loop, its axis and flywheel technique for overlaying become main pump motor manufacture in link together with technical barrier.The welding method adopting is argon tungsten-arc welding, argon tungsten-arc welding is a kind of non-melt pole inert gas-shielded arc welding, utilize the argon gas formation protective layer that rifle mouth ejects that electric arc and air are isolated, prevent that airborne oxygen and nitrogen are to tungsten electrode, molten bath and heat affected area metal cause illeffects, thereby acquisition quality weld, be divided into cold silk and hot wire welding etc. according to wire feeding mode, the welding method of the former employing of built-up welding of axle and flywheel is the argon tungsten-arc welding of cold silk, although it is stable that the argon arc welding of cold silk has welding process, the advantages such as appearance of weld is attractive in appearance, but deposition efficiency is low, speed of welding is slow, because tungsten electrode is limited to the bearing capacity of electric current, cannot further improve wire feed rate and deposition efficiency by strengthening electric current, therefore the argon arc welding of cold silk is for built-up welding, welding efficiency is low, simultaneously because the less welding current of cold silk argon arc welding, cause molten bath cooling velocity too fast, during due to the nickel-bass alloy material of built-up welding, molten pool metal is large compared with thickness, tension force, it is slower that gas and impurity overflow, and then be easy to produce defect, welding quality is unstable, and repair rate is higher, causes the waste of resource and the raising of production cost.
Summary of the invention: the object of this invention is to provide the tungsten argon arc hot wire welding bead-welding technology of a kind of main pump motor axle and flywheel, improve the problems such as the deposition efficiency of former oil cooling silk argon arc-welding built-up welding is low, and welding quality is unstable.
Technical scheme of the present invention is: the tungsten argon arc hot wire welding bead-welding technology of a kind of main pump motor axle and flywheel, and (1) welding conditions:
Welding current 325～370A, weldingvoltage 11～15V, speed of welding 120～250mm/min, protection-gas welding 99.999%Ar, gas flow 18.8L/min, polarity: straight polarity direct current;
Exchange heater supply, welding wire electric current 50～60A, welding wire voltage 3～6V, welding wire protective gas 99.999%Ar, gas flow 4.7～7.1L/min, wire feed rate: 3～4m/min;
205 ℃ of minimum preheat temperatures, 255 ℃ of large interlayer temperatures, 704～746 ℃ of post weld heat treatment, are incubated 3 hours, welding position downhand welding;
(2) wlding:
Welding wire kind: SFA-5.14(nickel alloy filler wire) trade mark: ERNiCr-3(nichrome welding wire) specification: Φ 1.2mm;
(3) welding procedure:
A) built-up welding of axle, axle is pole pattern, the both sides of axle have two U-shaped grooves, adopt method built-up welding nichrome in U-shaped groove of tungsten argon arc hot wire welding, and axle is placed on turning rolls, utilize roller rotation, with the rolling of moving axis, realize automatic welding; Flywheel hub built-up welding, flywheel hub is disc, in two planes of disk, offers U-shaped annular groove, the method built-up welding nichrome in U-shaped groove that adopts tungsten argon arc hot wire welding, is placed on flywheel on positioner, utilizes the rotation of positioner, flywheel driven disc spins, realizes automatic welding;
B) first weld front preparation, surfacing part and near 100mm region are cleared up, reach after cleannes requirement, start preheating, 205 ℃ of preheating minimum temperature, adopt tungsten argon arc hot wire welding to start to carry out built-up welding after meeting the demands;
C) weld by above-mentioned welding conditions, when welding, welding gun does not swing, and utilizes turning rolls and positioner to rotarily drive workpiece and rotates, realize automatic welding, welding adopts monofilament, first utilizes resistance heat to carry out preheating to welding wire by heater supply, reaches after predetermined temperature, send into molten bath at electric arc rear, realize welding, workpiece rotates a circle, and is soldered after one weld seam, stop arc and adjust welding torch position, descending one weld seam welding;
D) welding sequence, welding bead starts to arrange from groove left side, and it is 1/3-1/2 weld width that per pass weld seam is pressed road amount;
E) after groove welding completely, carry out Non-Destructive Testing and heat treatment, complete this technique.
Under the condition that is 1.2mm at this technique gage of wire, the wire feed rate of cold silk argon tungsten-arc welding is generally 0.4-1m/min, the wire feed rate of hot wire argon tungsten-arc welding can reach 3-4m/min, more than the argon arc welding of the colder silk of deposition efficiency and speed of welding has improved twice, improve greatly production efficiency, and hot wire welding adopts the mode of wire feed after electric arc, there is to good stirring action in molten bath, simultaneously because welding wire is after preheating, can reduce the cooling velocity in molten bath, impurity and gas in molten bath are better overflowed, reduce the formation probability of defect, be more suitable for welding the thickness such as nickel-base alloy, the non-ferrous metal that surface tension is large, effectively guarantee product quality.New welding technique of the present invention is applied in many products, and face of weld moulding is good, and 100% by nondestructive flaw detection examination, has reached Expected Results.
Accompanying drawing explanation
Fig. 1 axle construction form schematic diagram
Fig. 2 built-up welding groove type schematic diagram
Fig. 3 uranium pile weldering assembling form schematic diagram.
Wherein: 1. 2. 3. 4. 5. portal frame of wire feeding disc of turning rolls of motor shaft of argon arc welding gun
Fig. 4 flywheel structure form schematic diagram.
Fig. 5 built-up welding groove type schematic diagram
Fig. 6 flywheel built-up welding assembling form schematic diagram
Wherein: 6. 7. 8. 9. manipulator of thrust disc wheel hub of argon arc welding gun of positioner
The specific embodiment
The tungsten argon arc hot wire welding bead-welding technology of main pump motor axle and flywheel, welding current 325～370A, weldingvoltage 11～15V, speed of welding 120～250mm/min, protection-gas welding 99.999%Ar, gas flow 18.8L/min, polarity: straight polarity direct current;
Exchange heater supply, welding wire electric current 50～60A, welding wire voltage 3～6V, welding wire protective gas 99.999%Ar, gas flow 4.7～7.1L/min, wire feed rate: 3～4m/min;
205 ℃ of minimum preheat temperatures, 255 ℃ of large interlayer temperatures, 704～746 ℃ of post weld heat treatment, are incubated 3 hours, welding position downhand welding;
(2) wlding:
Welding wire kind: SFA-5.14(nickel alloy filler wire) trade mark: ERNiCr-3(nichrome welding wire) specification: Φ 1.2mm;
(3) welding procedure:
A) built-up welding of axle, axle is pole pattern, the both sides of axle have two U-shaped grooves, as Fig. 1, the method built-up welding nichrome in U-shaped groove that adopts tungsten argon arc hot wire welding, as Fig. 2, is placed on axle on turning rolls, utilizes roller rotation, with the rolling of moving axis, realize automatic welding, as Fig. 3.
Flywheel hub built-up welding, flywheel hub is disc, in two planes of disk, offer U-shaped annular groove, as Fig. 4, adopt method built-up welding nichrome in U-shaped groove of tungsten argon arc hot wire welding, as Fig. 5, flywheel is placed on positioner, utilizes the rotation of positioner, flywheel driven disc spins, realize automatic welding, as Fig. 6.
B) first weld front preparation, surfacing part and near 100mm region are cleared up, reach after cleannes requirement, start preheating, 205 ℃ of preheating minimum temperature, adopt tungsten argon arc hot wire welding to start to carry out built-up welding after meeting the demands;
C) welding conditions: welding current 325～370A, weldingvoltage 11～15V, speed of welding 120～250mm/min, protection-gas welding 99.999%Ar, gas flow 18.8L/min, polarity: straight polarity direct current; Exchange heater supply, welding wire electric current 50～60A, welding wire voltage 3～6V, welding wire protective gas 99.999%Ar, gas flow 4.7～7.1L/min, wire feed rate: 3～4m/min; 205 ℃ of minimum preheat temperatures, 255 ℃ of large interlayer temperatures, 704～746 ℃ of post weld heat treatment, are incubated 3 hours, welding position downhand welding;
Weld by above-mentioned welding conditions, when welding, welding gun does not swing, utilizing turning rolls and positioner to rotarily drive workpiece rotates, realize automatic welding, welding adopts monofilament, first utilizes resistance heat to carry out preheating to welding wire by heater supply, reaches after predetermined temperature, send into molten bath at electric arc rear, realize welding.Workpiece rotates a circle, and is soldered after one weld seam, stops arc and adjusts welding torch position, is descending one weld seam welding;
D) welding sequence, welding bead starts to arrange from groove left side, and it is 1/3-1/2 weld width that per pass weld seam is pressed road amount, as Fig. 5
E) after groove welding completely, carry out Non-Destructive Testing and heat treatment, complete this technique.
Claims (1)
1. a tungsten argon arc hot wire welding bead-welding technology for main pump motor axle and flywheel, its spy is:
(1) welding conditions:
Welding current 325～370A, weldingvoltage 11～15V, speed of welding 120～250mm/min, protection-gas welding 99.999%Ar, gas flow 18.8L/min, polarity: straight polarity direct current;
Exchange heater supply, welding wire electric current 50～60A, welding wire voltage 3～6V, welding wire protective gas 99.999%Ar, gas flow 4.7～7.1L/min, wire feed rate: 3～4m/min;
205 ℃ of minimum preheat temperatures, 255 ℃ of large interlayer temperatures, 704～746 ℃ of post weld heat treatment, are incubated 3 hours, welding position downhand welding;
(2) wlding:
Welding wire kind: SFA-5.14(nickel alloy filler wire) trade mark: ERNiCr-3(nichrome welding wire) specification: Φ 1.2mm;
(3) welding procedure:
A) built-up welding of axle, axle is pole pattern, the both sides of axle have two U-shaped grooves, adopt method built-up welding nichrome in U-shaped groove of tungsten argon arc hot wire welding, and axle is placed on turning rolls, utilize roller rotation, with the rolling of moving axis, realize automatic welding; Flywheel hub built-up welding, flywheel hub is disc, in two planes of disk, offers U-shaped annular groove, the method built-up welding nichrome in U-shaped groove that adopts tungsten argon arc hot wire welding, is placed on flywheel on positioner, utilizes the rotation of positioner, flywheel driven disc spins, realizes automatic welding;
B) first weld front preparation, surfacing part and near 100mm region are cleared up, reach after cleannes requirement, start preheating, 205 ℃ of preheating minimum temperature, adopt tungsten argon arc hot wire welding to start to carry out built-up welding after meeting the demands;
C) weld by above-mentioned welding conditions, when welding, welding gun does not swing, and utilizes turning rolls and positioner to rotarily drive workpiece and rotates, realize automatic welding, welding adopts monofilament, first utilizes resistance heat to carry out preheating to welding wire by heater supply, reaches after predetermined temperature, send into molten bath at electric arc rear, realize welding, workpiece rotates a circle, and is soldered after one weld seam, stop arc and adjust welding torch position, descending one weld seam welding;
D) welding sequence, welding bead starts to arrange from groove left side, and it is 1/3-1/2 weld width that per pass weld seam is pressed road amount;
E) after groove welding completely, carry out Non-Destructive Testing and heat treatment, complete this technique.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053066.7A CN103817414B (en) | 2014-02-17 | 2014-02-17 | The tungsten argon arc hot wire welding bead-welding technology of main pump motor axle and flywheel |
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| CN201410053066.7A CN103817414B (en) | 2014-02-17 | 2014-02-17 | The tungsten argon arc hot wire welding bead-welding technology of main pump motor axle and flywheel |
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| CN103817414A true CN103817414A (en) | 2014-05-28 |
| CN103817414B CN103817414B (en) | 2015-12-30 |
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Cited By (10)
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| CN104084670A (en) * | 2014-06-26 | 2014-10-08 | 中船澄西远航船舶（广州）有限公司 | Chrome-nickel alloy overlaying welding process of multipoint mooring device |
| CN104325213A (en) * | 2014-10-23 | 2015-02-04 | 哈尔滨电气动力装备有限公司 | Welding process for longitudinal welding seams of shielding sleeves of main pump motor |
| CN105499761A (en) * | 2015-12-16 | 2016-04-20 | 四川华象林产工业有限公司 | Motor stator shell and pole argon arc welding technology |
| CN106591559A (en) * | 2016-12-06 | 2017-04-26 | 哈尔滨电气动力装备有限公司 | Postweld heat treatment process method for forge piece of motor shaft of shield pump |
| CN107470743A (en) * | 2017-08-07 | 2017-12-15 | 豪利机械(苏州)有限公司 | The surface overlaying technique of deep-sea oil mechanical workpieces |
| CN108176914A (en) * | 2018-03-06 | 2018-06-19 | 威海浩洋机械制造有限公司 | Cylinder jack piston rod cladding build-up welding apparatus and jack piston rod |
| CN108406045A (en) * | 2018-03-06 | 2018-08-17 | 威海浩洋机械制造有限公司 | Cylinder jack piston rod cladding overlaying method |
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Cited By (15)
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| CN104084670A (en) * | 2014-06-26 | 2014-10-08 | 中船澄西远航船舶（广州）有限公司 | Chrome-nickel alloy overlaying welding process of multipoint mooring device |
| CN104084670B (en) * | 2014-06-26 | 2015-08-26 | 中船澄西船舶（广州）有限公司 | Multipoint mooring device chrome-nickel built-up welding welding procedure |
| CN104325213A (en) * | 2014-10-23 | 2015-02-04 | 哈尔滨电气动力装备有限公司 | Welding process for longitudinal welding seams of shielding sleeves of main pump motor |
| CN105499761A (en) * | 2015-12-16 | 2016-04-20 | 四川华象林产工业有限公司 | Motor stator shell and pole argon arc welding technology |
| CN106591559A (en) * | 2016-12-06 | 2017-04-26 | 哈尔滨电气动力装备有限公司 | Postweld heat treatment process method for forge piece of motor shaft of shield pump |
| CN107470743A (en) * | 2017-08-07 | 2017-12-15 | 豪利机械(苏州)有限公司 | The surface overlaying technique of deep-sea oil mechanical workpieces |
| CN108176914A (en) * | 2018-03-06 | 2018-06-19 | 威海浩洋机械制造有限公司 | Cylinder jack piston rod cladding build-up welding apparatus and jack piston rod |
| CN108406045A (en) * | 2018-03-06 | 2018-08-17 | 威海浩洋机械制造有限公司 | Cylinder jack piston rod cladding overlaying method |
| CN108176914B (en) * | 2018-03-06 | 2020-05-01 | 威海浩洋机械制造有限公司 | Oil cylinder jack piston rod cladding build-up welding device and jack piston rod |
| CN108406045B (en) * | 2018-03-06 | 2020-05-01 | 威海浩洋机械制造有限公司 | Oil cylinder jack piston rod cladding surfacing method |
| CN108856988A (en) * | 2018-09-12 | 2018-11-23 | 上海电气核电设备有限公司 | The welding procedure of heating wire TIG nickel alloy cladding layer intensity can be effectively controlled |
| CN108856988B (en) * | 2018-09-12 | 2021-02-12 | 上海电气核电设备有限公司 | Welding process capable of effectively controlling strength of hot wire TIG nickel-based alloy overlaying layer |
| CN113492250A (en) * | 2020-03-20 | 2021-10-12 | 上海电气电站设备有限公司 | Valve seat welding method |
| CN118237702A (en) * | 2024-03-22 | 2024-06-25 | 上海一核阀门股份有限公司 | Automatic surfacing method and surfacing tooling for sealing surface of nuclear-grade small-caliber valves |
| CN118237702B (en) * | 2024-03-22 | 2024-12-03 | 上海一核阀门股份有限公司 | Automatic surfacing method and surfacing tool for sealing surface of nuclear-grade small-caliber valve |
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