CN100526512C - Steam turbine valve manifold stellite alloy plasma spray welding method and equipment - Google Patents
Steam turbine valve manifold stellite alloy plasma spray welding method and equipment Download PDFInfo
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- CN100526512C CN100526512C CNB2005100222775A CN200510022277A CN100526512C CN 100526512 C CN100526512 C CN 100526512C CN B2005100222775 A CNB2005100222775 A CN B2005100222775A CN 200510022277 A CN200510022277 A CN 200510022277A CN 100526512 C CN100526512 C CN 100526512C
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Abstract
The disclosed spray welding method and device is disclosed for alloy used on steam turbine valve cover. As the target is circular, has large area and lots of weld paths, it should use mobile-weld path (multi-weld path) to spray weld the outside surface with welding layer thickness within a proper range. Wherein, controlling reasonably all of the start-end lapping quantity, oscillating amplitude, water temperature and pressure, working argon gas, feeding powder, protective argon gas flow, transfer arc current, and the welding speed; adjusting opposite destress parameters, and ensuring to meet design request.
Description
Technical field
The present invention relates to a kind of steam turbine valve portion cover periphery large area plasma spray welding technology, specifically steam turbine valve portion cover plasma spray welding method and equipment.
Background technology
Valve portion cover in the above steam turbine of 300MW that the applicant produces, need the built-up welding stellite as wear-resistant surfaces such as high-pressure admission pipe, extraction steam pipe, valve rod, valve setting, valve seats, originally can only adopt argon arc welding technique, its shortcoming is that efficient is low, defective is many, can not satisfy design and production requirement, this series products becomes the production task bottle neck.Through research trial repeatedly, successfully develop the plasma spray welding method and the special-purpose assorted equipment that are used for the big area periphery.This technology is used for steam turbine valve portion cover class periphery big area stellite plasma spray, according to the knowledge of the applicant, is initiative at home.
Summary of the invention
The manufacturing of plasma spraying welding equipment is inseparable with spray welding process, has spray welding process could formulate equipment scheme earlier.Therefore, one of task of the present invention is the plasma spray welding method that is used for the big area periphery in order to solve above-mentioned technical barrier, to develop.
Two of task of the present invention is the special-purpose assorted equipment that realization is used for the plasma spray welding method of big area periphery.
Method of the present invention, its technological process is: supplied materials, clamp, preheating, plasma spray, thermal treatment, processing, nondestructive test, precision work process, process control point is a plasma spray, thermal treatment,
(1) plasma spray: be big area surfacing stellite powder, adopt mobile, many welding beads ring-type overlap joint welding bead, the amplitude of oscillation is controlled at below the 30mm, layer thickness 3-5mm, non-arc current 50-70A, transferred arc electric current 190-220A, transferred arc voltage 38-40V, powder sending quantity 55-60g/Min puts wide 20-30mm, wobble frequency 25-30, welding speed 50-70mm/Min;
(2) thermal treatment: postweld heat treatment temperature 640-690 ± 15 ℃, six to eight hours hold-times, per hour maximum the intensification is 75 ℃, per hour maximum cooling is 75 ℃, when being cooled to below 300 ℃, comes out of the stove.
Spray welding apparatus of the present invention: by the PLC Controlling System, plasma spray power supply, spray welding gun, powder feeder, wig-wag, welding stand, the welding deflection machine, cooling system, water-cooled cable connects to form, welding torch is installed and clamps workpiece having on the movable frame of guide rail, powder feeder and non-arc, change arc power, the welding torch that the PLC housing connects control argon gas, deflection machine, wig-wag and water cooling unit and integrates water, electricity, gas, powder, welding torch is installed on the wig-wag, and non-arc, commentaries on classics arc power act on the workpiece by welding torch.
Described PLC Controlling System is the central controlled touch-screen type housing of each parameter of whole technological process.
Described plasma spray power supply, nontransferred arc power supply and transferred arc power supply are two-in-one, common cathode, the unloaded power supply of non-arc adopts big voltage 200V, changes arc maximum current 400A, and the arcing time factor of good volt-ampere characteristic and 100% is arranged.
Described powder feeder is an electronic powder feeder of controlling the powder sending quantity size when work by the adjusting of voltage.
Described wig-wag is the oscillation system that adopts microcomputerized control.
Described welding stand is that the bottom is equipped with guide rail, can realize the welding stand of the displacement on X, Y, three directions of Z.
Described welding deflection machine be can realize 135 ° of inclinations, can also horizontal rotation, rotating speed is adjustable, rotating ratio reaches welding deflection machine 100, that can clamp the 2T workpiece.
The present invention is through simulation test, and from the microanalysis of imitation specimen, its organization factors is splendid, dense structure and pure, any defective of no slag inclusion, loose, oxidation, pore and tiny crack one class (common being in other method built-up welding setllie layer); Dissect and find, pure the having no time of metallurgical binding layer that plasma spray welding bead and base material form, do not have other overlaying method common, from the dark tissue of base material side form must the shape mode osmosis pollution (such tissue increases the Si Taili thinning ratio, reduction Si Taili hardness); By the dissection and analysis to imitation specimen, the plasma spray thinning ratio is low, and weld seam is pure, and good by the processing parameter fusion that test is found out, layer hardness reaches design requirements, can be used for the plasma spray of inlet pipe cylindrical member and valve rod product; The PLC Controlling System, be the central controlled touch-screen type housing of each parameter of whole technological process, it is with each parameter centralized Control in the whole welding process, to logical ion gas, play untransferable arc, logical powder feeder, powder feeding, wig-wag action, play transferred arc, deflection machine rotation, current damping, stop operating, stop swinging, stop sequence of operations such as arc, delay time can be according to the processing requirement setting therebetween, one-key operation, simple and reliable, and have higher Automation of Welding level, guaranteed welding quality; From product application, take charge of the too welded bonds of vertical position welding layer and base material as seeing clearly after the inlet pipe grinding, the applicant has produced a complete qualified stellite plasma spray qualified product warehouse-in surplus in the of 500.
Description of drawings
Fig. 1 is the high power microtexture photo of plasma spray test specimen of the present invention.
Fig. 2 is the welded bonds metallurgical binding high power enlarged photograph of plasma spray test specimen of the present invention.
Fig. 3 is the high-pressure pipe photo after plasma spray product of the present invention, plasma spray and the thermal treatment.
Fig. 4 is the inlet pipe photo behind plasma spray product of the present invention, the correct grinding.
Fig. 5 is an equipment welding process control synoptic diagram of the present invention.
Fig. 6 is a product postweld heat treatment graphic representation of the present invention.
Fig. 7 is an equipment principle block diagram of the present invention.
Code name implication among Fig. 7: 1PLC housing 2 powder feeders 3 wig-wags 4 deflection machines 5 non-arcs, commentaries on classics arc power 6 frames 7 welding torches 8 argon gas 9 workpiece 10 water cooling units
Embodiment
At first need determine to solve the plasma spray welding method of steam turbine valve portion cover class big area periphery, its technological process is: supplied materials, clamp, preheating, plasma spray, thermal treatment, processing, harmless verification, precision work process, process control point is a plasma spray, thermal treatment.Plasma spray: be big area surfacing stellite powder (as the too upright 6# powdered alloy of department), adopt mobile, many welding beads ring-type overlap joint welding bead, the amplitude of oscillation is controlled at below the 30mm, layer thickness 3-5mm, non-arc current 50-70A, transferred arc electric current 190-220A, transferred arc voltage 38-40V, powder sending quantity 55-60g/Min puts wide 20-30mm, wobble frequency 25-30, welding speed 50-70mm/Min.
Secondly need to solve the equipment of the surfacing stellite of realizing processing method.
With reference to Fig. 7, by PLC Controlling System (1), plasma spray power supply (5), spray welding gun (7), powder feeder (2), wig-wag (3), welding stand (6), welding deflection machine (4), cooling system (10), water-cooled cable connects to form, welding torch (7) is installed on the movable frame (6) of guide rail and clamps workpiece (9) having, powder feeder (2) and non-arc, change arc power (5), PLC housing (1) connects control argon gas (8), deflection machine (4), wig-wag (3) and water cooling unit (10) and catchment,, gas, powder welding torch (7), welding torch (7) is installed on the wig-wag (3), non-arc, changeing arc power (5) acts on the workpiece (9) by welding torch (7).The PLC Controlling System is the central controlled touch-screen type housing of each parameter of whole technological process.Plasma spray power supply (5), nontransferred arc power supply and transferred arc power supply are two-in-one, common cathode, the unloaded power supply of non-arc adopts big voltage 200V, changes arc maximum current 400A, and the arcing time factor of good volt-ampere characteristic and 100% is arranged.Plasma spray power supply (5) is a LH-400P plasma spray power supply, and it integrates nontransferred arc power supply and transferred arc power supply, is the IGBT contravariant, it for surfacing need with high-energy untransferable arc and transferred arc the galvanic current source is provided.Powder feeder (2) is an electronic powder feeder of controlling the powder sending quantity size when work by the adjusting of voltage.Wig-wag (3) is to adopt microcomputerized control welding oscillation system, its controller adopts advanced microcomputer chip as computing, control core, adopt the accurate control of grating chi displacement, the swing planker adopts the PMI series precise ball screw of Taiwan HIWIN and the line slideway of Japanese THK, swing rate, the amplitude of oscillation, the edge residence time, displacement etc. can be set easily, reach the different requirements of technology, convenient and swift.Spray welding gun (7) is the plasma spray welding torch, and it integrates water, electricity, gas and powder, is the important ring of spray welding apparatus, the quality influence spray-welding coating quality of rifle body.Welding stand (6) is 2 * 2 welding stands, and the bottom is equipped with the 2m guide rail, can realize the displacement on X, Y, three directions of Z, satisfies the status requirement of product article on plasma spray welding gun in welding process.Welding deflection machine (4) is to realize: 135 ° of inclinations, can also horizontal rotation, rotating speed is adjustable, rotating ratio reaches welding deflection machine 100, that can clamp the 2T workpiece.Cooling system (10), fluorine Lyons cooling system is adopted in the cooling of the circulating water-cooling system water when being used for cooling off plasma spray welding gun work, can control the water temperature that the rifle body is imported and exported more exactly, 0-5Kg is adjustable for output hydraulic pressure, guarantees the works better of spray welding gun.
With reference to Fig. 6 and Fig. 3, the plasma spray postwelding need be heat-treated: postweld heat treatment temperature 640-690 ± 15 ℃, and six to eight hours hold-times, per hour maximum the intensification is 75 ℃, per hour maximum cooling is 75 ℃, when being cooled to below 300 ℃, comes out of the stove.
With reference to Fig. 5; Fig. 7 and Fig. 1; Fig. 2; Fig. 4; start PLC Controlling System (1); parameter is set; select procedure starts welding; follow procedure 2; start water cooling unit (10); follow procedure 1 starts ion gas; powder feeding gas; protection gas; start non-arc (5); start wig-wag (3); open powder feeder (2); starting changes arc (5); [the ion gas in the plasma arc generation source between the nozzle (anode) of spray welding gun (7) and electrode (negative electrode) by the high-frequency spark plasma untransferable arc that ignites; between negative electrode and workpiece (changeing the arc anode) by the plasma untransferable arc transition plasma transferred arc that ignites]; start deflection machine (4) beginning surfacing, see whether surfacing is finished, do not finish surfacing and then be displaced to next welding bead automatically; continue surfacing; after finishing surfacing, press stop key and stall arc; stop powder feeding; stop deflection machine; stop untransferable arc; stop surfacing and stop water cooling unit.From the plasma spray test specimen as can be seen: the as cast condition dendritic structure is tiny, and is pure, zero defect and welded bonds metallurgical binding; From the plasma spray product, can clearly see the welded bonds of stellite layer and base material.Microcosmic is feasible, and macroscopic view is reliable, thereby has reached purpose of the present invention.
Claims (7)
1. steam turbine valve manifold stellite alloy plasma spray welding method, its technological process is: supplied materials, clamp, preheating, plasma spray, thermal treatment, processing, nondestructive test, precision work process, process control point is a plasma spray, thermal treatment,
(1) plasma spray: be big area surfacing stellite powder, adopt mobile, many welding beads ring-type overlap joint welding bead, the amplitude of oscillation is controlled at below the 30mm, layer thickness 3-5mm, non-arc current 50-70A, transferred arc electric current 190-220A, transferred arc voltage 38-40V, powder sending quantity 55-60g/Min puts wide 20-30mm, wobble frequency 25-30, welding speed 50-70mm/Min;
(2) thermal treatment: 640-690 ℃ of postweld heat treatment temperature, six to eight hours hold-times, per hour maximum the intensification is 75 ℃, per hour maximum cooling is 75 ℃, when being cooled to below 300 ℃, comes out of the stove.
2. steam turbine valve manifold stellite alloy plasma spraying welding equipment, by the PLC Controlling System, the plasma spray power supply, spray welding gun, powder feeder, wig-wag, welding stand, the welding deflection machine, cooling system, water-cooled cable connects to form, welding torch is installed and clamps workpiece having on the movable frame of guide rail, powder feeder and plasma spray power supply, the PLC Controlling System connects the control argon gas, deflection machine, wig-wag and water cooling unit and catchment,, gas, powder welding torch, welding torch is installed on the wig-wag, the plasma spray power supply acts on the workpiece by welding torch, it is characterized in that: the plasma spray power supply adopts the IGBT inverter, and wig-wag is the oscillation system that adopts microcomputerized control.
3. equipment according to claim 2 is characterized in that: the PLC Controlling System is the central controlled touch-screen type housing of each parameter of whole technological process.
4. equipment according to claim 2, it is characterized in that: the plasma spray power supply is made up of nontransferred arc power supply and transferred arc power supply, the two common cathode, the unloaded power supply of nontransferred arc power supply adopts big voltage 200V, transferred arc power supply maximum current 400A has the arcing time factor of good volt-ampere characteristic and 100%.
5. equipment according to claim 2 is characterized in that: powder feeder is an electronic powder feeder of controlling the powder sending quantity size when work by the adjusting of voltage.
6. equipment according to claim 2 is characterized in that: welding stand is that the bottom is equipped with guide rail, can realize the welding stand of the displacement on X, Y, three directions of Z.
7. equipment according to claim 2 is characterized in that: the welding deflection machine be can realize 135 ° of inclinations, can also horizontal rotation, rotating speed is adjustable, rotating ratio reaches welding deflection machine 100, that can clamp the 2T workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100222775A CN100526512C (en) | 2005-12-14 | 2005-12-14 | Steam turbine valve manifold stellite alloy plasma spray welding method and equipment |
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| CNB2005100222775A CN100526512C (en) | 2005-12-14 | 2005-12-14 | Steam turbine valve manifold stellite alloy plasma spray welding method and equipment |
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| CN1804127A CN1804127A (en) | 2006-07-19 |
| CN100526512C true CN100526512C (en) | 2009-08-12 |
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| CNB2005100222775A Active CN100526512C (en) | 2005-12-14 | 2005-12-14 | Steam turbine valve manifold stellite alloy plasma spray welding method and equipment |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2147737A4 (en) * | 2007-03-12 | 2013-02-27 | Mitsubishi Heavy Ind Ltd | Valve gear |
| CN103028825A (en) * | 2011-09-28 | 2013-04-10 | 沈阳透平机械股份有限公司 | Surface hardening treatment method for shaft sleeve of nuclear secondary pump |
| CN102787871B (en) * | 2012-07-10 | 2014-12-10 | 东方电气集团东方汽轮机有限公司 | Main steam valve of steam turbine |
| CN102925891B (en) * | 2012-11-09 | 2014-10-22 | 中国人民解放军装甲兵工程学院 | Plasma cladding system |
| CN105710519A (en) * | 2014-12-01 | 2016-06-29 | 陆峰 | Pulse microbeam plasma surfacing method for inner wall of steel pipe |
| CN107127436A (en) * | 2016-02-29 | 2017-09-05 | 沈阳海纳自动化设备有限公司 | A kind of plasma spray welder |
| CN106975830B (en) * | 2017-05-23 | 2019-07-23 | 东方电气集团东方汽轮机有限公司 | A kind of valve disc multiple location plasma spray stellite process |
| CN107186324B (en) * | 2017-06-10 | 2019-04-23 | 中国人民解放军装甲兵工程学院 | A kind of welding gun offset determination remanufactured for plate class titanium alloy wear-out part arc-welding |
| CN110270748A (en) * | 2018-03-13 | 2019-09-24 | 江苏万恒铸业有限公司 | The technique of mechanization plasma spray hard alloy valve sealing face |
| CN109514059A (en) * | 2018-11-23 | 2019-03-26 | 东方电气集团东方汽轮机有限公司 | A kind of sliding surface manufacturing method of valve parts |
| CN109514058B (en) * | 2018-11-23 | 2020-12-29 | 东方电气集团东方汽轮机有限公司 | Water erosion prevention treatment method for last-stage blade of steam turbine |
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| CN1804127A (en) | 2006-07-19 |
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