CN102913288A - Low-pressure turbine rotor and welding method thereof - Google Patents
Low-pressure turbine rotor and welding method thereof Download PDFInfo
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- CN102913288A CN102913288A CN2012104459741A CN201210445974A CN102913288A CN 102913288 A CN102913288 A CN 102913288A CN 2012104459741 A CN2012104459741 A CN 2012104459741A CN 201210445974 A CN201210445974 A CN 201210445974A CN 102913288 A CN102913288 A CN 102913288A
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Abstract
The invention provides a low-pressure turbine rotor. The low-pressure turbine rotor is formed by sequence-welding at least two rotor forging segments; and as each rotor forging segment is relatively small in size and lighter in weight, expensive oversize smelting equipment, external refining equipment, large-scale forging equipment or heat treatment equipment is not required, and accordingly, the manufacturing cost of the turbine rotor can be effectively lowered. As each rotor forging segment is lighter in weight and small in size, the internal organization and structural homogeneity of materials can be guaranteed after manufacture and heat treatment, the reliability in nondestructive examination of the inner quality is high, and the quality of the rotor can be easily guaranteed. If the quality problem occurs to a certain rotor forging segment, the only requirement is to replace the rotor forging segment with poor quality, so that the maintenance cycle of the rotor is short, and the maintenance cost of the rotor is low. Moreover, the welded rotor can be made of flexibly selected materials, and different parts can be combined by materials with different strength grade and/or material properties, so that roles of the materials with different properties can be given into full play, and precious metals are saved.
Description
Technical field
The present invention relates to the turbine making field, particularly the welding method of a kind of Low Pressure Steam Turbine and this Low Pressure Steam Turbine.
Background technique
Steam turbine is the rotary power machinery that the transformation of energy with steam becomes mechanical work, enter steam turbine from the steam of boiler after, pass through successively nozzle and the movable vane of a series of loop configurations, the heat energy of steam is converted into the mechanical energy of turbine rotor rotation.Steam carries out transformation of energy by different way in steam turbine, just consisted of the steam turbine of different operating principle.Formed by rotating part and two aspects of stationary part.Rotor comprises main shaft, impeller, movable vane and coupling etc., and stator comprises admission part, cylinder, dividing plate and the parts such as static cascade, packing and bearing.
Turbine rotor is the vitals of steam turbine transformation of energy, existing turbine rotor is mainly forge piece, turbine rotor forging requirement metallurgical quality is good, material is even, it is low to have high strength, high-plasticity, high tenacity, center brittle transition temperature, crystal grain is tiny, and ultrasonic flaw detection requires very strict.For the rotor of weight less than 100 tons, the religion of solid forging difficulty is little.When the rotor weight more than 100 tons per, forging needs large-scale smelting furnace, refining furnace, forging, heat treatment equipment during whole the manufacturing, needs to drop into substantial contribution and carries out infrastructure and main equipment development; Super-huge vacuum melting furnace, external refining, electroslag remelting, large-scale steel ingot cast, large forgings forging manufacturing technique and large forgings process of thermal treatment technical difficulty are high, and productivity is low; And when the turbine rotor size was larger, the sensitivity page or leaf of its nondestructive inspection (NDI) descended easily, and it is relatively large therefore to forge difficulty of processing.
Low Pressure Steam Turbine is positioned at the low-pressure section of steam turbine, steam enters drive rotor and blade acting after the low-pressure section, the low pressure admission temperature generally is lower than 400 ℃, Half Speed nuclear power temperature is lower, about about 100 ℃ of inferior final stage and impeller place temperature, therefore low-pressure section rotor/axle requires to have good toughness and higher intensity, and therefore its forging difficulty of processing is more large for the low-pressure turbine rotor of large quality.
Summary of the invention
The shortcoming of prior art the object of the present invention is to provide the Low Pressure Steam Turbine that a kind of processing technology is simple, the manufacturing cycle is short, cost of production is low in view of the above.
Reach for achieving the above object other relevant purposes, the invention provides a kind of Low Pressure Steam Turbine, this Low Pressure Steam Turbine is comprised of at least two rotor forging segmentations, welds between adjacent two rotor forging segmentations.
Preferably, the compositions in weight percentage of described rotor forging comprises: C :≤0.35, Si :≤0.35, Mn:0.15～0.90, Mo:0.25～0.95, Cr:1.50～2.40, Ni:1.00～3.75, V :≤0.15, P :≤0.015, S :≤0.015, and all the other are Fe.
Preferably, weld by 1.0%Ni, 2.25%Cr-Mo, 12%Cr-1Ni-Mo or 2.5%Ni alloyed steel welding wire between described adjacent two rotor forging segmentations.
Preferably, described Low Pressure Steam Turbine is thermal power steam turbine low pressure rotor or nuclear steam turbine low pressure rotor.
The invention also discloses a kind of welding method of above-mentioned Low Pressure Steam Turbine, it comprises the steps:
1) processes bevel for welding in each good rotor forging segmentation of forging;
2) along the axial direction of turbine rotor, each rotor forging segmentation is overlayed on the horizontal revolving stage successively, at adjacent two rotor forging connection segment places argon arc welding gun is set, drive each rotor forging segmentation rotation by horizontal revolving stage, simultaneously by argon arc welding gun to the adjacent rotor forging segmentation weld, make each rotor forging segmentation rotor structure that is welded as a whole;
3) adopt heat treatment furnace to heat-treat.
Preferably, step 2) finish after, the integral rotor structure of welding is overturn, with its two end supports on rolling wheel support, and at each rotor forging segmentation weld corresponding submerged arc welding is set, drive this integral rotor structure rotation by drive unit, by submerged arc welding the weld seam between adjacent two rotor forging segmentations is welded again simultaneously.
Preferably, heat treatment temperature is 500 ℃-680 ℃ in the step 3).
As mentioned above, Low Pressure Steam Turbine of the present invention and welding method thereof have following beneficial effect: this Low Pressure Steam Turbine is welded by at least two rotor forging segmentations, each rotor forging segmentation volume is quite less, weight is lighter, therefore do not need expensive super-huge smelting equipment, external refining equipment, large-sized forging equipment and heat treatment installation, can effectively reduce turbine rotor and reduce manufacture cost.Because each rotor forging segmentation weight and size are less, its make and heat treatment after the inherent tissue of material easily guarantee, even tissue, the inherent quality reliability of nondestructive testing is high, rotor quality is easy to assurance.If quality problems appear in a certain rotor forging segmentation, can only change the rotor forging segmentation that has quality problems, the service cycle of rotor is short, and maintenance cost is low.Have, this welded disc turbine rotor selection is flexible again, can adopt strength grade and/or the different combination of materials of material property at different parts according to designing requirement, gives full play to the material of different performance, saves noble metal.
Description of drawings
Fig. 1 is the structural representation of first embodiment of the invention.
Fig. 2 is the structural representation of second embodiment of the invention.
Fig. 3 is the structural representation of third embodiment of the invention.
Fig. 4 is the structural representation of each rotor forging segmentation when horizontal revolving stage welds.
Fig. 5 is the structural representation of Low Pressure Steam Turbine when rolling wheel support welds.
Fig. 6 is the structural representation of low-pressure welding rotor when heat-treating.
Fig. 7 is for adding the structural representation in man-hour to low-pressure welding rotor face of weld.
Fig. 8 is for carrying out the structural representation of NDT check to low-pressure welding rotor weld seam.
The element numbers explanation
Embodiment
Below by particular specific embodiment explanation embodiments of the present invention, person skilled in the art scholar can understand other advantages of the present invention and effect easily by the disclosed content of this specification.
See also Fig. 1 to Fig. 8.Notice, the appended graphic structure that illustrates of this specification, ratio, size etc., equal contents in order to cooperate specification to disclose only, understand and reading for person skilled in the art scholar, be not to limit the enforceable qualifications of the present invention, so technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionate relationship or size, not affecting under the effect that the present invention can produce and the purpose that can reach, all should still drop on disclosed technology contents and get in the scope that can contain.Simultaneously, quote in this specification as " on ", D score, " left side ", " right side ", " centre " reach the term of " " etc., also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under without essence change technology contents, when also being considered as the enforceable category of the present invention.
As shown in Figure 1, the invention provides a kind of Low Pressure Steam Turbine, this Low Pressure Steam Turbine 1 is welded by two rotor forging segmentations 11,12, is weld seam 15 between the rotor forging segmentation 11,12.Different according to the weight of Low Pressure Steam Turbine 1 and structure, the rotor forging number of fragments that forms Low Pressure Steam Turbine 1 also can respective change, as shown in Figure 2, as second embodiment of the present invention, this Low Pressure Steam Turbine 1 is welded by four rotor forging segmentations 11,12,13,14.Again as shown in Figure 3, as the 3rd embodiment of the present invention, this Low Pressure Steam Turbine 1 is welded by six rotor forging segmentations.The Low Pressure Steam Turbine of this structure can be used as thermal power steam turbine low pressure rotor or nuclear steam turbine low pressure rotor.
Because the operating temperature of Low Pressure Steam Turbine generally is lower than 400 ℃, and is lower for Half Speed nuclear power temperature, therefore about about 100 ℃ of inferior final stage and impeller place temperature often require good toughness and higher intensity to Low Pressure Steam Turbine.The invention also discloses a kind of alloy material for For Manufacturing Lower-Pressure Turbine-rotor for this reason, the compositions in weight percentage of this alloy material comprises: C :≤0.35, Si :≤0.35, Mn:0.15～0.90, Mo:0.25～0.95, Cr:1.50～2.40, Ni:1.00～3.75, V :≤0.15, P :≤0.015, S :≤0.015, and all the other are Fe.
As a kind of optimal way, the compositions in weight percentage of this alloy material comprises: C:0.23, Si:0.27, Mn:0.6, Mo:0.45, Cr:2.1, Ni:3.25, V:0.13, P:0.01, S :≤0.008, and all the other are Fe.After testing, the Low Pressure Steam Turbine that the alloy material of employing said components is made has very good toughness and higher intensity, and is more prone to welding, and the connection of welding between latter two adjacent rotor forging segmentation is also more firm.As a kind of optimal way, weld by 1.0%Ni, 2.25%Cr-Mo, 12%Cr-1Ni-Mo or 2.5%Ni alloyed steel welding wire between adjacent two rotor forging segmentations.
This Low Pressure Steam Turbine is welded by at least two rotor forging segmentations, each rotor forging segmentation volume is quite less, weight is lighter, therefore do not need expensive super-huge smelting equipment, external refining equipment, large-sized forging equipment and heat treatment installation, can effectively reduce turbine rotor and reduce manufacture cost.Because each rotor forging segmentation weight and size are less, its make and heat treatment after the inherent tissue of material easily guarantee, even tissue, the inherent quality reliability of nondestructive testing is high, rotor quality is easy to assurance.If quality problems appear in a certain rotor forging segmentation, can only change the rotor forging segmentation that has quality problems, the service cycle of rotor is short, and maintenance cost is low.Have, this welded disc turbine rotor selection is flexible again, can adopt strength grade and/or the different combination of materials of material property at different parts according to designing requirement, gives full play to the material of different performance, saves noble metal.
In order to improve the efficient of welding, the invention also discloses a kind of welding method of above-mentioned single casing steam turbine welded disc turbine rotor, the below is take embodiment two as example, and the welding method of this Low Pressure Steam Turbine is described in detail.At first forging each good rotor forging segmentation 11,12,13, process bevel for welding on 14, then as shown in Figure 4, along the axial direction of turbine rotor each rotor forging segmentation is overlayed on the horizontal revolving stage 2 successively, connect for convenient, can a mount support 3 be set at horizontal revolving stage 2, when carrying out the rotor forging segmentation and stack, can at first rotor forging segmentation 11 be placed on the mount support 3, mount support 3 can be fixed rotor forging segmentation 11, and then rotor forging segmentation 12 is placed on rotor forging segmentation 11, simultaneously two rotor forging segmentations 11,12 joints arrange argon arc welding gun 4, then by horizontal revolving stage rotor driven forging segmentation 11,12 rotations are simultaneously by 4 pairs of rotor forging segmentations 11 of argon arc welding gun, 12 weld.After rotor forging segmentation 11,12 welding are finished, again rotor forging segmentation 13 is placed in the rotor forging segmentation 12, in rotor forging segmentation 12,13 joints argon arc welding gun 4 is set, by the rotation horizontal revolving stage rotor forging segmentation 12,13 is welded equally, then repeating above-mentioned steps, rotor forging segmentation 13,14 is welded, and whole like this Low Pressure Steam Turbine can tentatively weld and finish.
In order to guarantee welding quality, Low Pressure Steam Turbine needs to adopt submerged arc welding that each rotor forging segmentation is further welded after adopting the preliminary welding of argon arc welding to finish usually.During welding as shown in Figure 5, the good integral rotor structure of tentatively welding is overturn, with its two end supports on rolling wheel support 5, and at each rotor forging segmentation weld corresponding submerged arc welding 6 is set, drive this integral rotor structure rotation by drive unit, again welded by the weld seam between 6 pairs of adjacent two rotor forging segmentations of submerged arc welding simultaneously.When carrying out submerged arc welding, can weld each segmentation piecemeal, also can disposable each segmentation be welded simultaneously.
The welding finish after as shown in Figure 6, vertical being placed on the mount support 3 of Low Pressure Steam Turbine that welding is good, then whole Low Pressure Steam Turbine is placed in the heat treatment furnace 7, heat-treat by 7 pairs of low-pressure turbine rotors of heat treatment furnace weld joint, heat treatment temperature is relevant with the actual chemical composition of rotor forging material, actual mechanical property and selected welding consumables, generally between 500 ℃-680 ℃, select, should guarantee after heat treatment is finished that whole low-pressure turbine rotor need to have good toughness and higher intensity.
In order further to check the quality of weld joint welding, as shown in Figure 7, this Low Pressure Steam Turbine can be overturn again and be placed on the rolling wheel support 5, in the both sides of this Low Pressure Steam Turbine whirligig 9 is set, in each rotor forging segmentation place machining tool 8 is set, then drive this Low Pressure Steam Turbine rotation by whirligig 9, machining tool 8 butt welded seam places are processed, make the weld joint become more smooth, attractive in appearance.At last more as shown in Figure 8, carry out the NDI check by NDI detector 10 butt welded seams, determine whether the quality of weld seam is qualified.
Adopt above-mentioned welding method can effectively accelerate the welding machine speed of Low Pressure Steam Turbine, enhance productivity, each rotor forging segmentation only need once be welded and a heat treatment at butt welded seam place can be finished welding, and production process is very simple, manufacture cycle is shortened, cost of production is reduced.And can the material behavior of rotor forging segmentation not impacted, and then can effectively guarantee the quality of Low Pressure Steam Turbine.In sum, the present invention has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not is used for restriction the present invention.Any person skilled in the art scholar all can be under spirit of the present invention and category, and above-described embodiment is modified or changed.Therefore, have in the technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of finishing under disclosed spirit and the technological thought, must be contained by claim of the present invention.
Claims (7)
1. a Low Pressure Steam Turbine is characterized in that, this Low Pressure Steam Turbine is comprised of at least two rotor forging segmentations, welds between adjacent two rotor forging segmentations.
2. Low Pressure Steam Turbine according to claim 1, it is characterized in that, the compositions in weight percentage of described rotor forging comprises: C :≤0.35, Si :≤0.35, Mn:0.15～0.90, Mo:0.25～0.95, Cr:1.50～2.40, Ni:1.00～3.75, V :≤0.15, P :≤0.015, S :≤0.015, and all the other are Fe.
3. Low Pressure Steam Turbine according to claim 1 is characterized in that, welds by 1.0%Ni, 2.25%Cr-Mo, 12%Cr-1Ni-Mo or 2.5%Ni alloyed steel welding wire between described adjacent two rotor forging segmentations.
4. Low Pressure Steam Turbine according to claim 1 is characterized in that, described Low Pressure Steam Turbine is thermal power steam turbine low pressure rotor or nuclear steam turbine low pressure rotor.
5. the welding method of a Low Pressure Steam Turbine is characterized in that, it comprises the steps:
A) process bevel for welding in each good rotor forging segmentation of forging;
B) along the axial direction of turbine rotor, each rotor forging segmentation is overlayed on the horizontal revolving stage successively, at adjacent two rotor forging connection segment places argon arc welding gun is set, drive each rotor forging segmentation rotation by horizontal revolving stage, simultaneously by argon arc welding gun to the adjacent rotor forging segmentation weld, make each rotor forging segmentation rotor structure that is welded as a whole;
C) adopt heat treatment furnace to heat-treat.
6. the welding method of low pressure rotor according to claim 5, it is characterized in that: step 2) finish after, the integral rotor structure of welding is overturn, with its two end supports on rolling wheel support, and at each rotor forging segmentation weld corresponding submerged arc welding is set, drive this integral rotor structure rotation by drive unit, by submerged arc welding the weld seam between adjacent two rotor forging segmentations is welded again simultaneously.
7. the welding method of low pressure rotor according to claim 5, it is characterized in that: heat treatment temperature is 500 ℃-680 ℃ in the step 3).
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| CN2012104459741A CN102913288A (en) | 2012-11-09 | 2012-11-09 | Low-pressure turbine rotor and welding method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104625606A (en) * | 2014-12-05 | 2015-05-20 | 东方电气集团东方汽轮机有限公司 | Small turbine stainless steel rotor forming method |
| CN105940135A (en) * | 2014-04-23 | 2016-09-14 | 日本铸锻钢株式会社 | Turbine rotor material for geothermal power generation and method for manufacturing same |
| CN107695266A (en) * | 2017-11-15 | 2018-02-16 | 江阴方圆环锻法兰有限公司 | Steam turbine high temperature resistant forging and its forging method |
| CN110067601A (en) * | 2019-03-21 | 2019-07-30 | 中信重工机械股份有限公司 | A kind of steam turbine moving vane shroud clinching method based on argon arc welding motor |
| CN113199215A (en) * | 2021-05-12 | 2021-08-03 | 远景能源有限公司 | Wind power generation spindle and manufacturing method thereof |
| CN114985878A (en) * | 2022-06-21 | 2022-09-02 | 湖南华菱湘潭钢铁有限公司 | Welding method for large-diameter circumferential weld |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113199215A (en) * | 2021-05-12 | 2021-08-03 | 远景能源有限公司 | Wind power generation spindle and manufacturing method thereof |
| CN114985878A (en) * | 2022-06-21 | 2022-09-02 | 湖南华菱湘潭钢铁有限公司 | Welding method for large-diameter circumferential weld |
| CN114985878B (en) * | 2022-06-21 | 2023-07-28 | 湖南华菱湘潭钢铁有限公司 | Welding method for large-caliber girth weld |
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Application publication date: 20130206 |