CN102151953A - Welding method for assembling HRSG (Heat Recovery Steam Generator) - Google Patents
Welding method for assembling HRSG (Heat Recovery Steam Generator) Download PDFInfo
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Abstract
The invention relates to a welding method for assembling an HRSG (Heat Recovery Steam Generator). The welding method is characterized by comprising the steps of: assembly of spiral fin pipes and headers and general assembly of modules. In the assembly of the spiral fin pipes and the headers, two rows of spiral fin pipes are welded on each head, wherein each row consists of 23 spiral fin pipes; in full-penetration fillet weld of the spiral fin pins and the headers, a method combining argon arc welding for sealing the bottom and manual electric welding for covering the surface is adopted; and in the assembling and welding of the modules, manual welding is required, and modules need to be assembled from the middle to the two sides. Welded weld joints in the invention not only have molded and full appearance, but also have smooth joints, and all the products are qualified by 100% MT inspection after welding, the problem that the HRSG is difficult to weld is solved, the circulating efficiency of the HRSG is improved, the energy is saved, the investment cost is saved, and the environmentally-friendly performance is achieved.
Description
Technical field: the welding method that the present invention relates to a kind of HRSG waste-heat oven assembling.
Background technology: the HRSG boiler is different from other station boilers that we produced in the past, it mainly shows as all heating surfaces and all adopts spiral finned tube, do not adopt the pipe joint form on the collection case, but spiral finned tube is welded in directly on the collection case with complete penetraction and fusion in welding angle welding form.
The HRSG boiler is compared with conventional boiler, has cycle efficieny height, good reliability, in light weight, advantage such as size is little, toggle speed is fast, water consumption is low, construction period is short, investment cost is economized and environmental-protecting performance is superior.In order to make the HRSG project become company's new growth engines, company has built up the HRSG boiler for producing place of producing 4 cover 9F levels per year in Shanghai.And several HRSG modules have successfully been made.
Summary of the invention: purpose of the present invention is exactly the welding method that the assembling of a kind of HRSG waste-heat oven will be provided, and improves the boiler cycle efficieny, energy-conservation, investment cost is economized and environmental-protecting performance.In the HRSG boiler was made, it was made difficult point and is spiral finned tube and the assembling of collection case and final module general assembly.The object of the present invention is achieved like this, and the welding method of HRSG waste-heat oven assembling is characterized in that: spiral finned tube and the assembling, the welding sequence that collect case;
1). need weldering two row's spiral finned tubes on the every collection case, every row has 23 pipes; At first adorn the 23 piece pipes of welding position in collection case center, locate to carry out tack welding for 45 ° at the pipe first half, spot welding 2 points, the about 2mm of spot welding length, as shown in Figure 1, treat that whole array of pipes welding finishes to reach after the assay was approved, refill welding position in 45 ° of 23 pipes locating of collection case, the spot welding program is the same, the about 3mm in fit-up gap, too small as the gap, produce indent in the time of can causing the Lower Half back cover; Excesssive gap, overlap, and when electric welding capping subsequently is because that the weld seam broad causes appearance to be shaped is not attractive in appearance.
2). spiral finned tube and the welding that collects case complete penetraction and fusion in welding angle welding;
A. first step welding is positioned at row's helix fin pipe of collection case center, adopts the argon arc welding back cover to add manual electric welding capping method; The electric arc heat should be concentrated on the case basin mouth relatively during the argon arc welding back welding, treat to add welding wire again after the fusing of basin mouth, tungsten electrode swings slightly, welding wire is filled in up molten bath as far as possible, and it is too many that welding wire should not add, and to avoid lack of penetration phenomenon; Should control the temperature in molten bath and up speed during back cover well, guarantee the smooth of sealing bead;
B. collect case and pipe angle welding and adopt to connect very difficulty of arc-welding maneuver, must control temperature during welding well; Be easy to generate defectives such as undercut as misoperation at the melt run place of collection case and pipe angle welding,, rather than welding rod directly pushed on the size of needs so weld width will allow the molten bath spread out to reach during capping; Welding during Lower Half electric arc need compress, and first half electric arc slightly pine a bit, it is attractive in appearance to be beneficial to appearance of weld; For the weld seam that can make the bottom is rounding off, should adopt the method for picking the molten bath during welding, promptly when the bottom weld seam welds, weld quarter turn length earlier, when the 1/4 length welding of back, allow the heat of electric arc fully melt the position that needs joint, see that the molten bath when falling down, one digs gently inward, molten iron has just fallen down, constantly electric arc is flat with this breach benefit then, up welds according to normal weldering speed again, and the joint that welds out like this is smooth and attractive in appearance; Note heat deflection collection case one side of electric arc during capping, welding rod is 60 ° with the collection case;
C. when an other array of pipes that welding is positioned at that 45 ° in case of collection locates, because an array of pipes of weldering has hindered the assembling of an array of pipes of back weldering earlier, so the centre position starting the arc that should be from 5 point～4 during the argon arc welding back cover, 6 have one section towing astern weldering in the bottom; Because the fit-up gap is 3mm, and gage of wire is 2.4mm, so, beat on groove with electric arc then, add the method for welding wire again as long as a semidiameter of welding wire is placed in the gap, the towing astern weldering will produce indent; For fear of bottom fitting, when towing astern was transformed into up process, wrist will be rotated along with pipe, allowed arc-melting basin mouth, and tungsten electrode swings slightly, add welding wire go upward at 7～8 in the middle of blow-outs; The 2nd step of back cover, the 3rd step people may stand in the outside of collection case, weld for the 3rd step and use the left-handed operation handgrip.
3). electric welding capping operating sequence; The order of electric welding capping is the same with the argon arc welding back cover, the arc-welding of the company of employing; Welding rod is 45 ° with the collection case when connecting the arc-welding capping, and in the 1st step of capping, it is too not high to start, and a bit just passable on 7 o'clock, it is too high to start, the easy slag inclusion of towing astern section, and throat depth is thinner.Capping the 2nd can pick the molten bath forever in the joint during step method makes joint smooth, when welding the 2nd step, the 3rd step, slightly swing about, the electric arc pine a bit, it is attractive in appearance to weld the bead contour that comes out like this; The 2nd step is when receiving arc, blow-out place again spot welding once, in case shrinkage cavity, the 3rd step needed spot welding again when receiving arc, in case joint exceeds.
When carrying out the module general assembly, the difficulty maximum be 23 pipes and level to be 60 ° U type elbow assemble butt welding with pipe row; The radius of U type elbow is R, R=60mm, weld bond to U type elbow then the distance be L, L=160mm, weld bond is H to pipe row comb plate, comb joint distance, H=100mm, and U type elbow and U type elbow center distance are A, A=80mm, pipe row has 5 rows, and pipe row is M with pipe row spacing, and M=120mm is as Fig. 2, Fig. 3; Described here is second row's welding operation method, because can't adopt the method for bed hedgehopping between second row and first row, so the welding position is the most difficult.
The welding method of HRSG waste-heat oven assembling is characterized in that: module assembling welding, need the hand welding during welding, and for pick up speed, should assemble to both sides from the centre; Middle to the right assembling, to welding position difficulty maximum,, the good elbow of last root bead is arranged because obstacle is arranged during the left hand weldering;
1). the employing filler wire is TGS-50, and φ 2.4; This welding wire good fluidity, through welding is strong, and the bath temperature height very easily produces overlap, if the gap is little, because welding position portion is good, tends to produce defectives such as indent; So the fit-up gap should be controlled between 1.5～2mm; The bottom is during the starting the arc, and weld seam is higher than mother metal easily, easily causes incomplete penetration defect when joint, so the up speed of heating and welding will keep coordinating when the starting the arc;
2). when welding was inboard, because spacing is little, the switch of handgrip must be controlled outside the elbow semicircle, sight line sees into from the slit between elbow, outer in the bend horizontal position then as unique optimal selection point of sight line, and the gap of bottom can't be seen, can only see the another side groove, need with the sensation welding;
3). about 110 ° at the nozzle of argon arc welding handgrip, so the inclination angle between nozzle and the weld seam when welding as far as possible near vertical, just can not cause monolateral, generation incomplete fusion defective;
4). clear up the interior oil of each 20mm scope of welding region before the welding, become rusty, stay 20～30 root face, the protection throughput is about 7～9L/min; Be convenient control temperature, with the short arc welding, decay current is smaller, and length is short, welding wire TGS-50 φ 2.4, electric current 95～100A;
5). the weldering bottom is 1/4 o'clock earlier, and for ease of joint, arcing point must be crossed 6 points, as far as possible near 7 points; Welding wire is converted into and can be beneficial to the garden arcuation that adds silk, promptly send welding wire after the starting the arc because tube wall is thin, this fragment position in 7 point～6, welding wire will leave weld seam, moves along electric arc, welding wire adds a bit less, weldering thin a bit, will guarantee through welding like this; This section of 6 point～3, weldering speed is quicker; When bottom fitting, control electrode holder with left hand, the first starting the arc allows its heat fused and add welding wire on the weld seam mouth that welds, if temperature is too high, can weld with damped method in the welding process;
6). during first half welding, weldering speed wants fast, and welding wire is close to the center, gap and does not leave electric arc, check and accept arc until 12, during top sub, when interface 2～3mm, allow the electric arc heat fully melt the both sides interface and the welding wire that progressively increases rapidly, fill up welding wire blow-out a little until interface;
7). during the argon arc welding capping, tungsten electrode swings in the groove scope, and is too high for preventing weld seam, can add welding wire in both sides in groove; During the top capping, welding wire does not leave weld seam, controls bath temperature with damped method, reduces temperature with adding silk fast, causes the tenesmus of capping layer metal in order to avoid temperature is too high, produces defectives such as hot air vents and overlap.Institute of the present invention welding line, not only appearance forming is full, and joint is smooth, and uses endoscopy, the internal connection slyness, the saturating degree of root is even, and it is all qualified that postwelding is checked through 100%MT.Solve the problem of HRSG waste-heat oven welding difficulty, improved the boiler cycle efficieny, energy-conservation, investment cost is economized and environmental-protecting performance.
Description of drawings:
Fig. 1 is the position view of 2 of the spot welding of the present invention two row spiral finned tubes;
Fig. 2 assembles the structural representation of butt welding for U type elbow of the present invention with pipe row;
Fig. 3 is pipe row of the present invention and pipe row spacing schematic diagram;
1. spot welding, 2.U type elbow, 3.U type elbow radius R, 4. weld bond to pipe row comb plate, comb joint distance is H, 5.U type elbow and U type elbow center distance are A, 6. pipe row comb plate, comb joint, 7. weld bond, weld bond to U type elbow then distance be L, 9. weld bond b, 10. pipe row is M with pipe row spacing.
The specific embodiment; The invention will be further described below in conjunction with accompanying drawing;
The welding method of HRSG waste-heat oven assembling is characterized in that: spiral finned tube and the assembling, the welding sequence that collect case;
1). need weldering two row's spiral finned tubes on the every collection case, every row has 23 pipes; At first adorn the 23 piece pipes of welding position in collection case center, locate to carry out tack welding for 45 ° at the pipe first half, spot welding 2 points, the about 2mm of spot welding length, as shown in Figure 1, treat that whole array of pipes welding finishes to reach after the assay was approved, refill welding position in 45 ° of 23 pipes locating of collection case, the spot welding program is the same, the about 3mm in fit-up gap, too small as the gap, produce indent in the time of can causing the Lower Half back cover; Excesssive gap has overlap, and when electric welding capping subsequently, because that the weld seam broad causes appearance to be shaped is not attractive in appearance;
2). spiral finned tube and the welding that collects case complete penetraction and fusion in welding angle welding;
A. first step welding is positioned at row's helix fin pipe of collection case center, adopts the argon arc welding back cover to add manual electric welding capping method; The electric arc heat should be concentrated on the case basin mouth relatively during the argon arc welding back welding, treat to add welding wire again after the fusing of basin mouth, tungsten electrode swings slightly, welding wire is filled in up molten bath as far as possible, and it is too many that welding wire should not add, and to avoid lack of penetration phenomenon; Should control the temperature in molten bath and up speed during back cover well, guarantee the smooth of sealing bead;
B. collect case and pipe angle welding and adopt to connect very difficulty of arc-welding maneuver, must control temperature during welding well; Be easy to generate defectives such as undercut as misoperation at the melt run place of collection case and pipe angle welding,, rather than welding rod directly pushed on the size of needs so weld width will allow the molten bath spread out to reach during capping; Welding during Lower Half electric arc need compress, and first half electric arc slightly pine a bit, it is attractive in appearance to be beneficial to appearance of weld; For the weld seam that can make the bottom is rounding off, should adopt the method for picking the molten bath during welding, promptly when the bottom weld seam welds, weld quarter turn length earlier, when the 1/4 length welding of back, allow the heat of electric arc fully melt the position that needs joint, see that the molten bath when falling down, one digs gently inward, molten iron has just fallen down, constantly electric arc is flat with this breach benefit then, up welds according to normal weldering speed again, and the joint that welds out like this is smooth and attractive in appearance; Note heat deflection collection case one side of electric arc during capping, welding rod is 60 ° with the collection case;
C. when an other array of pipes that welding is positioned at that 45 ° in case of collection locates, because an array of pipes of weldering has hindered the assembling of an array of pipes of back weldering earlier, so the centre position starting the arc that should be from 5 point～4 during the argon arc welding back cover, 6 have one section towing astern weldering in the bottom; Because the fit-up gap is 3mm, and gage of wire is 2.4mm, so, beat on groove with electric arc then, add the method for welding wire again as long as a semidiameter of welding wire is placed in the gap, the towing astern weldering will produce indent; For fear of bottom fitting, when towing astern was transformed into up process, wrist will be rotated along with pipe, allowed arc-melting basin mouth, and tungsten electrode swings slightly, add welding wire go upward at 7～8 in the middle of blow-outs; The 2nd step of back cover, the 3rd step people may stand in the outside of collection case, weld for the 3rd step and use the left-handed operation handgrip;
3). electric welding capping operating sequence; The order of electric welding capping is the same with the argon arc welding back cover, the arc-welding of the company of employing; Welding rod is 45 ° with the collection case when connecting the arc-welding capping, and in the 1st step of capping, it is too not high to start, and a bit just passable on 7 o'clock, it is too high to start, the easy slag inclusion of towing astern section, and throat depth is thinner.Capping the 2nd can pick the molten bath forever in the joint during step method makes joint smooth, when welding the 2nd step, the 3rd step, slightly swing about, the electric arc pine a bit, it is attractive in appearance to weld the bead contour that comes out like this; The 2nd step is when receiving arc, blow-out place again spot welding once, in case shrinkage cavity, the 3rd step needed spot welding again when receiving arc, in case joint exceeds.
The welding method of HRSG waste-heat oven assembling is characterized in that: module assembling welding, need the hand welding during welding, and for pick up speed, should assemble to both sides from the centre; Middle to the right assembling, to welding position difficulty maximum,, the good elbow of last root bead is arranged because obstacle is arranged during the left hand weldering;
1). the employing filler wire is TGS-50, and φ 2.4; This welding wire good fluidity, through welding is strong, and the bath temperature height very easily produces overlap, if the gap is little, because welding position portion is good, tends to produce defectives such as indent; So the fit-up gap should be controlled between 1.5～2mm; The bottom is during the starting the arc, and weld seam is higher than mother metal easily, easily causes incomplete penetration defect when joint, so the up speed of heating and welding will keep coordinating when the starting the arc;
2). when welding was inboard, because spacing is little, the switch of handgrip must be controlled outside the elbow semicircle, sight line sees into from the slit between elbow, outer in the bend horizontal position then as unique optimal selection point of sight line, and the gap of bottom can't be seen, can only see the another side groove, need with the sensation welding;
3). about 110 ° at the nozzle of argon arc welding handgrip, so the inclination angle between nozzle and the weld seam when welding as far as possible near vertical, just can not cause monolateral, generation incomplete fusion defective;
4). clear up the interior oil of each 20mm scope of welding region before the welding, become rusty, stay 20～30 root face, the protection throughput is about 7～9L/min; Be convenient control temperature, with the short arc welding, decay current is smaller, and length is short, welding wire TGS-50 φ 2.4, electric current 95～100A;
5). the weldering bottom is 1/4 o'clock earlier, and for ease of joint, arcing point must be crossed 6 points, as far as possible near 7 points; Welding wire is converted into and can be beneficial to the garden arcuation that adds silk, promptly send welding wire after the starting the arc because tube wall is thin, this fragment position in 7 point～6, welding wire will leave weld seam, moves along electric arc, welding wire adds a bit less, weldering thin a bit, will guarantee through welding like this; This section of 6 point～3, weldering speed is quicker; When bottom fitting, control electrode holder with left hand, the first starting the arc allows its heat fused and add welding wire on the weld seam mouth that welds, if temperature is too high, can weld with damped method in the welding process;
6). during first half welding, weldering speed wants fast, and welding wire is close to the center, gap and does not leave electric arc, check and accept arc until 12, during top sub, when interface 2～3mm, allow the electric arc heat fully melt the both sides interface and the welding wire that progressively increases rapidly, fill up welding wire blow-out a little until interface;
7) during the argon arc welding capping, tungsten electrode swings in the groove scope, and is too high for preventing weld seam, can add welding wire in both sides in groove; During the top capping, welding wire does not leave weld seam, controls bath temperature with damped method, reduces temperature with adding silk fast, causes the tenesmus of capping layer metal in order to avoid temperature is too high, produces defectives such as hot air vents and overlap.
Claims (2)
1.HRSG the welding method of waste-heat oven assembling is characterized in that: spiral finned tube and the assembling, the welding sequence that collect case;
1). need weldering two row's spiral finned tubes on the every collection case, every row has 23 pipes; At first adorn the 23 piece pipes of welding position in collection case center, locate to carry out tack welding for 45 ° at the pipe first half, spot welding 2 points, the about 2mm of spot welding length treats that whole array of pipes welding finishes and after the assay was approved, refills welding position in 45 ° of 23 pipes locating of collection case, the spot welding program is the same, the about 3mm in fit-up gap, too small as the gap, produce indent in the time of can causing the Lower Half back cover; Excesssive gap has overlap, and when electric welding capping subsequently, because that the weld seam broad causes appearance to be shaped is not attractive in appearance;
2). spiral finned tube and the welding that collects case complete penetraction and fusion in welding angle welding;
A. first step welding is positioned at row's helix fin pipe of collection case center, adopts the argon arc welding back cover to add manual electric welding capping method; The electric arc heat should be concentrated on the case basin mouth relatively during the argon arc welding back welding, treat to add welding wire again after the fusing of basin mouth, tungsten electrode swings slightly, welding wire is filled in up molten bath as far as possible, and it is too many that welding wire should not add, and to avoid lack of penetration phenomenon; Should control the temperature in molten bath and up speed during back cover well, guarantee the smooth of sealing bead;
B. collect case and pipe angle welding and adopt to connect very difficulty of arc-welding maneuver, must control temperature during welding well; Be easy to generate the defective of undercut at the melt run place of collection case and pipe angle welding as misoperation,, rather than welding rod directly pushed on the size of needs so weld width will allow the molten bath spread out to reach during capping; Welding during Lower Half electric arc need compress, and first half electric arc slightly pine a bit, it is attractive in appearance to be beneficial to appearance of weld; For the weld seam that can make the bottom is rounding off, should adopt the method for picking the molten bath during welding, promptly when the bottom weld seam welds, weld quarter turn length earlier, when the 1/4 length welding of back, allow the heat of electric arc fully melt the position that needs joint, see that the molten bath when falling down, one digs gently inward, molten iron has just fallen down, constantly electric arc is flat with this breach benefit then, up welds according to normal weldering speed again, and the joint that welds out like this is smooth and attractive in appearance; Note heat deflection collection case one side of electric arc during capping, welding rod is 60 ° with the collection case;
C. when an other array of pipes that welding is positioned at that 45 ° in case of collection locates, because an array of pipes of weldering has hindered the assembling of an array of pipes of back weldering earlier, so the centre position starting the arc that should be from 5 point～4 during the argon arc welding back cover, 6 have one section towing astern weldering in the bottom; Because the fit-up gap is 3mm, and gage of wire is 2.4mm, so, beat on groove with electric arc then, add the method for welding wire again as long as a semidiameter of welding wire is placed in the gap, the towing astern weldering will produce indent; For fear of bottom fitting, when towing astern was transformed into up process, wrist will be rotated along with pipe, allowed arc-melting basin mouth, and tungsten electrode swings slightly, add welding wire go upward at 7～8 in the middle of blow-outs; The 2nd step of back cover, the 3rd step people may stand in the outside of collection case, weld for the 3rd step and use the left-handed operation handgrip;
3). electric welding capping operating sequence; The order of electric welding capping is the same with the argon arc welding back cover, the arc-welding of the company of employing; Welding rod is 45 ° with the collection case when connecting the arc-welding capping, and in the 1st step of capping, it is too not high to start, and a bit just passable on 7 o'clock, it is too high to start, the easy slag inclusion of towing astern section, and throat depth is thinner.Capping the 2nd can pick the molten bath forever in the joint during step method makes joint smooth, when welding the 2nd step, the 3rd step, slightly swing about, the electric arc pine a bit, it is attractive in appearance to weld the bead contour that comes out like this; The 2nd step is when receiving arc, blow-out place again spot welding once, in case shrinkage cavity, the 3rd step needed spot welding again when receiving arc, in case joint exceeds.
2.HRSG the welding method of waste-heat oven assembling is characterized in that: module assembling welding, need the hand welding during welding, for pick up speed, should assemble to both sides from the centre; Middle to the right assembling, to welding position difficulty maximum,, the good elbow of last root bead is arranged because obstacle is arranged during the left hand weldering;
1). the employing filler wire is TGS-50, and φ 2.4; This welding wire good fluidity, through welding is strong, and the bath temperature height very easily produces overlap, if the gap is little, because welding position portion is good, tends to produce defectives such as indent; So the fit-up gap should be controlled between 1.5～2mm; The bottom is during the starting the arc, and weld seam is higher than mother metal easily, easily causes incomplete penetration defect when joint, so the up speed of heating and welding will keep coordinating when the starting the arc;
2). when welding was inboard, because spacing is little, the switch of handgrip must be controlled outside the elbow semicircle, sight line sees into from the slit between elbow, outer in the bend horizontal position then as unique optimal selection point of sight line, and the gap of bottom can't be seen, can only see the another side groove, need with the sensation welding;
3). about 110 ° at the nozzle of argon arc welding handgrip, so the inclination angle between nozzle and the weld seam when welding as far as possible near vertical, just can not cause monolateral, generation incomplete fusion defective;
4). clear up the interior oil of each 20mm scope of welding region before the welding, become rusty, stay 20～30 root face, the protection throughput is about 7～9L/min; Be convenient control temperature, with the short arc welding, decay current is smaller, and length is short, welding wire TGS-50 φ 2.4, electric current 95～100A;
5). the weldering bottom is 1/4 o'clock earlier, and for ease of joint, arcing point must be crossed 6 points, as far as possible near 7 points; Welding wire is converted into and can be beneficial to the garden arcuation that adds silk, promptly send welding wire after the starting the arc because tube wall is thin, this fragment position in 7 point～6, welding wire will leave weld seam, moves along electric arc, welding wire adds a bit less, weldering thin a bit, will guarantee through welding like this; This section of 6 point～3, weldering speed is quicker; When bottom fitting, control electrode holder with left hand, the first starting the arc allows its heat fused and add welding wire on the weld seam mouth that welds, if temperature is too high, can weld with damped method in the welding process;
6). during first half welding, weldering speed wants fast, and welding wire is close to the center, gap and does not leave electric arc, check and accept arc until 12, during top sub, when interface 2～3mm, allow the electric arc heat fully melt the both sides interface and the welding wire that progressively increases rapidly, fill up welding wire blow-out a little until interface;
7) during the argon arc welding capping, tungsten electrode swings in the groove scope, and is too high for preventing weld seam, can add welding wire in both sides in groove; During the top capping, welding wire does not leave weld seam, controls bath temperature with damped method, reduces temperature with adding silk fast, causes the tenesmus of capping layer metal in order to avoid temperature is too high, produces defectives such as hot air vents and overlap.
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| CN104690488A (en) * | 2015-02-10 | 2015-06-10 | 衡阳市大成锅炉有限公司 | Method for assembling large-sized single-drum boiler body |
| CN106051724A (en) * | 2015-04-17 | 2016-10-26 | 通用电器技术有限公司 | Collar supported pressure parts for heat recovery steam generators |
| CN114571151A (en) * | 2022-04-06 | 2022-06-03 | 河南中电工程咨询有限公司 | Construction method for intensively installing construction platform on small-caliber pipeline of waste heat furnace |
| CN117245188A (en) * | 2023-11-17 | 2023-12-19 | 淄博市特种设备检验研究院 | Special plasma welding equipment for large-diameter boiler shell |
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- 2011-02-23 CN CN2011100478630A patent/CN102151953A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104690488A (en) * | 2015-02-10 | 2015-06-10 | 衡阳市大成锅炉有限公司 | Method for assembling large-sized single-drum boiler body |
| CN104690488B (en) * | 2015-02-10 | 2017-05-03 | 衡阳市大成锅炉有限公司 | Method for assembling large-sized single-drum boiler body |
| CN106051724A (en) * | 2015-04-17 | 2016-10-26 | 通用电器技术有限公司 | Collar supported pressure parts for heat recovery steam generators |
| CN106051724B (en) * | 2015-04-17 | 2020-03-27 | 通用电器技术有限公司 | Collar-supported pressure member for heat recovery steam generator |
| CN114571151A (en) * | 2022-04-06 | 2022-06-03 | 河南中电工程咨询有限公司 | Construction method for intensively installing construction platform on small-caliber pipeline of waste heat furnace |
| CN114571151B (en) * | 2022-04-06 | 2024-02-23 | 河南中电工程咨询有限公司 | Construction method for centralized installation of construction platform of small-caliber pipelines of waste heat furnace |
| CN117245188A (en) * | 2023-11-17 | 2023-12-19 | 淄博市特种设备检验研究院 | Special plasma welding equipment for large-diameter boiler shell |
| CN117245188B (en) * | 2023-11-17 | 2024-01-19 | 淄博市特种设备检验研究院 | Special plasma welding equipment for large-diameter boiler shell |
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Application publication date: 20110817 |