CN105081536A - Narrow-gap MIG welding method of turbine nozzles - Google Patents
Narrow-gap MIG welding method of turbine nozzles Download PDFInfo
- Publication number
- CN105081536A CN105081536A CN201510465442.8A CN201510465442A CN105081536A CN 105081536 A CN105081536 A CN 105081536A CN 201510465442 A CN201510465442 A CN 201510465442A CN 105081536 A CN105081536 A CN 105081536A
- Authority
- CN
- China
- Prior art keywords
- nozzle
- welding
- steam turbine
- welded
- volume fraction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a narrow-gap MIG welding method of turbine nozzles, belongs to the field of welding of turbines, and in particular, relates to a turbine nozzle welding method of a large-thickness welding structure. The invention aims to solve the defects of high welding cost and long production auxiliary period in vacuum electronic beams and high labor intensity and low efficiency in manual shielded metal arc welding. The welding method comprises (1) preparation before welding, (2) obtaining of a clean nozzle set and a clean nozzle chamber through cleanness before welding, (3) obtaining of turbine nozzles to be welded through assembly, (4) obtaining of the preheated turbine nozzles through preheating, (5) obtaining of the welded turbine nozzles through welding, (6) obtaining of the post-heated and hydrogen-removed turbine nozzles through post-heating, and (7) completion of the narrow-gap MIG welding of the turbine nozzles through post-welding heat treatment. The welding method has the advantages of largely improving the nozzle welding quality, shortening the production period and gaining excellent economical and social benefits. The welding method is mainly applied to the narrow-gap MIG welding of the turbine nozzles.
Description
Technical field
The invention belongs to steam turbine welding field, be specifically related to the welded welding gas turbine jet nozzle method of heavy thickness.
Background technology
Nozzle of steam turbine is that the important composition portion in steam turbine structure one of is overlapped, and its operating temperature, pressure ratio are higher, and operating condition is also more severe.Nozzle of steam turbine common manufacturing method adopts mosaic texture, and mentality of designing is loaded down with trivial details, complicated structure.Along with the high speed development of solder technology, domestic and international turbine making business generally utilizes the welding method such as vacuum electron beam, stick electrode arc welding to manufacture nozzle of steam turbine, although vacuum electron beam welding has the high feature of welding efficiency, but it is long for non-cutting time also inevitably to have welding, nozzle faying face fit quality is high, postwelding clearance time is long, welding cost is high, and supplied materials requires the shortcomings such as tight containing the quantity of magnetism; It is low that stick electrode arc welding has welding cost, but the shortcoming such as welding efficiency is low, labor strength is large.
Summary of the invention
The object of the invention is to solve vacuum electron beam welding cost high, produce assisting period long; Large, the inefficient shortcoming of stick electrode arc welding labour intensity, and the narrow gap MIG welding method of nozzle of steam turbine is provided.
The narrow gap MIG welding method of nozzle of steam turbine, specifically completes according to the following steps:
One, welds prepares: machining is carried out to nozzle sets bevel for welding size, the root face obtaining position to be welded is the nozzle sets to be welded of 2 ± 0.25mm, machining is carried out to nozzle box's bevel for welding size, the root face obtaining position to be welded is the nozzle box to be welded of 2 ± 0.25mm, and ensure nozzle sets to be welded and nozzle box to be welded weld before under confined state groove gap should≤1mm;
Two, preweld cleaning: clear up nozzle sets to be welded and surface, nozzle box to be welded respectively, removes corrosion, oxide skin, coating, greasy dirt, missible oil liquid and foul, obtains clean nozzle sets and clean nozzle box;
Three, assemble: clean nozzle sets is assembled in clean nozzle box, and ensure that groove minimum widith must not be less than 8mm, then carry out spot welding and fix, obtain nozzle of steam turbine to be welded;
Four, preheating: nozzle of steam turbine to be welded entirety is evenly preheated to 150 ~ 200 DEG C from room temperature with the heating rate of≤150 DEG C/h, obtains nozzle of steam turbine after preheating;
Five, welding: the nozzle of steam turbine after preheating is put on positioner, look for axiality < 0.5mm between the center of the bevel for welding of nozzle of steam turbine after preheating and welding turntable, then after preheating, nozzle of steam turbine and positioner carry out clamping and fixing, then narrow gap MIG welding equipment is utilized to carry out wire feed welding, the filling welding of multilayer single track is carried out between the bevel for welding of the rear nozzle of steam turbine of preheating, its welding sequence is followed successively by prime coat, intermediate layer and capping layer, and after preheating, the bevel for welding surface temperature of nozzle of steam turbine must not lower than 150 DEG C during welding, prime coat welding condition: electric current is 220 ~ 260A, voltage is 27 ~ 29V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, intermediate layer welding condition: electric current is 270 ~ 300A, voltage is 29 ~ 30V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, capping layer welding condition: electric current is 300 ~ 320A, voltage is 30 ~ 32V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, obtain welding rear nozzle of steam turbine,
Six, after heat disappears hydrogen process: at temperature is 300 ~ 350 DEG C, carries out after heat to nozzle of steam turbine after welding disappears hydrogen process, and after heat disappears hydrogen process 2h ~ 3h, obtains after heat and to disappear the nozzle of steam turbine after hydrogen process;
Seven, post weld heat treatment: enter stove be warming up to 740 ± 10 DEG C with the programming rate of≤80 DEG C/h after heat the disappeared nozzle of steam turbine entirety after hydrogen process, and 6h ~ 8h is incubated at temperature is 740 ± 10 DEG C, then 150 ~ 200 DEG C are cooled to the cooling rate of≤60 DEG C/h, then cut off the electricity supply natural air cooling to room temperature, the narrow gap MIG namely completing nozzle of steam turbine welds.
Principle: after the present invention strictly clears up nozzle sets and nozzle box's welding region, carry out spot welding according to nozzle rigging position relation to fix, then weld preheating is carried out to nozzle, meet after solder technology requirement until preheat temperature, by bevel for welding processing dimension, nozzle is carried out on positioner alignment and clamping, steady job, then weld by narrow gap MIG welding procedure.After welding completes, immediately after heat is carried out to nozzle and to disappear hydrogen process, to reduce welding stress and to change microstructures of weld metals structure to improve its mechanical property.After after-baking completes, nozzle is placed on airless place and isolates, make its slow cooling, then timely by nozzle shove charge, tempering, to carry out the final property heat treatment of nozzle, thus complete the welding job to nozzle.
Advantage of the present invention: the present invention adopts narrow gap MIG solder technology, has not only increased substantially the welding quality of nozzle, has shortened the production cycle, achieved good economic and social benefit.
Accompanying drawing explanation
Fig. 1 is that detailed description of the invention one utilizes narrow gap MIG welding equipment to carry out wire feed operation chart;
Fig. 2 is structural representation after welding gas turbine jet nozzle;
Fig. 3 is a-quadrant partial enlarged drawing in Fig. 2, and in figure, H represents the root face at nozzle sets to be welded position to be welded, and in figure, h represents the root face at position to be welded, nozzle box to be welded, and in figure, n represents the gap of nozzle sets to be welded and nozzle box to be welded, and in figure, m represents groove width.
Detailed description of the invention
Detailed description of the invention one: present embodiment is the narrow gap MIG welding method of nozzle of steam turbine, specifically completes according to the following steps:
One, welds prepares: machining is carried out to nozzle sets bevel for welding size, the root face obtaining position to be welded is the nozzle sets to be welded of 2 ± 0.25mm, machining is carried out to nozzle box's bevel for welding size, the root face obtaining position to be welded is the nozzle box to be welded of 2 ± 0.25mm, and ensure nozzle sets to be welded and nozzle box to be welded weld before under confined state groove gap should≤1mm;
Two, preweld cleaning: clear up nozzle sets to be welded and surface, nozzle box to be welded respectively, removes corrosion, oxide skin, coating, greasy dirt, missible oil liquid and foul, obtains clean nozzle sets and clean nozzle box;
Three, assemble: clean nozzle sets is assembled in clean nozzle box, and ensure that groove minimum widith must not be less than 8mm, then carry out spot welding and fix, obtain nozzle of steam turbine to be welded;
Four, preheating: nozzle of steam turbine to be welded entirety is evenly preheated to 150 ~ 200 DEG C from room temperature with the heating rate of≤150 DEG C/h, obtains nozzle of steam turbine after preheating;
Five, welding: nozzle of steam turbine after preheating is put on positioner, look for axiality < 0.5mm between the center of the bevel for welding of nozzle of steam turbine after preheating and welding turntable, then after preheating, nozzle of steam turbine and positioner carry out clamping and fixing, then narrow gap MIG welding equipment is utilized to carry out wire feed welding, the filling welding of multilayer single track is carried out between the bevel for welding of the rear nozzle of steam turbine of preheating, welding sequence is followed successively by prime coat, intermediate layer and capping layer, and after preheating, the bevel for welding surface temperature of nozzle of steam turbine must not lower than 150 DEG C during welding, prime coat welding condition: electric current is 220 ~ 260A, voltage is 27 ~ 29V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, intermediate layer welding condition: electric current is 270 ~ 300A, voltage is 29 ~ 30V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, capping layer welding condition: electric current is 300 ~ 320A, voltage is 30 ~ 32V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, obtain welding rear nozzle of steam turbine,
Six, after heat disappears hydrogen process: at temperature is 300 ~ 350 DEG C, carries out after heat to nozzle of steam turbine after welding disappears hydrogen process, and after heat disappears hydrogen process 2h ~ 3h, obtains after heat and to disappear the nozzle of steam turbine after hydrogen process;
Seven, post weld heat treatment: enter stove be warming up to 740 ± 10 DEG C with the programming rate of≤80 DEG C/h after heat disappeared nozzle of steam turbine entirety after hydrogen process, and 6h ~ 8h is incubated at temperature is 740 ± 10 DEG C, then 150 ~ 200 DEG C are cooled to the cooling rate of≤60 DEG C/h, then cut off the electricity supply natural air cooling to room temperature, the narrow gap MIG namely completing nozzle of steam turbine welds.
Principle: after the present invention strictly clears up nozzle sets and nozzle box's welding region, carry out spot welding according to nozzle rigging position relation to fix, then weld preheating is carried out to nozzle, meet after solder technology requirement until preheat temperature, by bevel for welding processing dimension, nozzle is carried out on positioner alignment and clamping, steady job, then weld by narrow gap MIG welding procedure.After welding completes, immediately after heat is carried out to nozzle and to disappear hydrogen process, to reduce welding stress and to change microstructures of weld metals structure to improve its mechanical property.After after-baking completes, nozzle is placed on airless place and isolates, make its slow cooling, then timely by nozzle shove charge, tempering, to carry out the final property heat treatment of nozzle, thus complete the welding job to nozzle.
Detailed description of the invention two: the difference of present embodiment and detailed description of the invention one is: in step 3, clean nozzle sets is assembled in clean nozzle box, and groove gap is 8mm ~ 10mm, then carries out spot welding and fixes, obtain nozzle of steam turbine to be welded.Other are identical with detailed description of the invention one.
Detailed description of the invention three: one of present embodiment and detailed description of the invention one or two difference is: with the heating rate of 100 DEG C/h ~ 150 DEG C/h in step 4, nozzle of steam turbine to be welded entirety is evenly preheated to 150 ~ 200 DEG C from room temperature, obtains nozzle of steam turbine after preheating.Other are identical with detailed description of the invention one or two.
Detailed description of the invention four: one of present embodiment and detailed description of the invention one to three difference is: prime coat welding condition in step 5: electric current is 230A ~ 250A, voltage is 27.2V ~ 28.5V, Ar/CO
2the gas flow of gaseous mixture is 21L/min ~ 24L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%.Other are identical with detailed description of the invention one to three.
Detailed description of the invention five: one of present embodiment and detailed description of the invention one to four difference is: intermediate layer welding condition in step 5: electric current is 270A ~ 290A, voltage is 29.2V ~ 29.8V, Ar/CO
2the gas flow of gaseous mixture is 21L/min ~ 24L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%.Other are identical with detailed description of the invention one to four.
Detailed description of the invention six: one of present embodiment and detailed description of the invention one to five difference is: step 5 middle cover surface layer welding condition: electric current is 320A, voltage is 32V, Ar/CO
2the gas flow of gaseous mixture is 23L/min ~ 24L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%.Other are identical with detailed description of the invention one to five.
Detailed description of the invention seven: present embodiment with one of detailed description of the invention one to six difference is: to walk in step 6 and at temperature is 300 ~ 330 DEG C, after heat is carried out to nozzle of steam turbine after welding and to disappear hydrogen process, after heat disappears hydrogen process 2 ~ 3h, obtains after heat and to disappear nozzle of steam turbine after hydrogen process.Other are identical with detailed description of the invention one to six.
Detailed description of the invention eight: one of present embodiment and detailed description of the invention one to seven difference is: with the heating rate of 60 ~ 80 DEG C/h in step 7, the nozzle of steam turbine entirety after hydrogen process that after heat disappeared enters stove and is warming up to 740 ± 10 DEG C, and is incubated 6 ~ 8h at temperature is 740 ± 10 DEG C.Other are identical with detailed description of the invention one to seven.
Detailed description of the invention nine: one of present embodiment and detailed description of the invention one to eight difference is: with the cooling rate of 50 ~ 60 DEG C/h in step 7, be cooled to 150 ~ 200 DEG C, then cut off the electricity supply natural air cooling to room temperature, the narrow gap MIG namely completing nozzle of steam turbine welds.Other are identical with detailed description of the invention one to eight.
Adopt following verification experimental verification effect of the present invention
Embodiment 1: the narrow gap MIG welding method of nozzle of steam turbine, specifically completes according to the following steps:
One, welds prepares: machining is carried out to nozzle sets bevel for welding size, the root face obtaining position to be welded is the nozzle sets to be welded of 2mm, machining is carried out to nozzle box's bevel for welding size, the root face obtaining position to be welded is the nozzle box to be welded of 2mm, and nozzle sets to be welded and nozzle box to be welded weld before under confined state groove gap be 0.5mm;
Two, preweld cleaning: clear up nozzle sets to be welded and surface, nozzle box to be welded respectively, removes corrosion, oxide skin, coating, greasy dirt, missible oil liquid and foul, obtains clean nozzle sets and clean nozzle box;
Three, assemble: clean nozzle sets is assembled in clean nozzle box, is 8.5mm through surveying known groove width, then carries out spot welding and fixing, obtaining nozzle of steam turbine to be welded;
Four, preheating: nozzle of steam turbine to be welded is preheated to 180 DEG C from room temperature with the heating rate of 120 DEG C/h, obtains nozzle of steam turbine after preheating;
Five, weld: nozzle of steam turbine after preheating is put on positioner, look for the center of the bevel for welding of nozzle of steam turbine after preheating concentric with positioner turntable, again nozzle of steam turbine after preheating and positioner are carried out clamping and fixing, then narrow gap MIG welding equipment is utilized to carry out the filling welding of multilayer single track, carry out the welding of prime coat, intermediate layer and capping layer successively, and the bevel for welding surface temperature 180 DEG C of nozzle of steam turbine after preheating during welding, prime coat welding condition: electric current is 240A, voltage is 27.8V, Ar/CO
2the gas flow of gaseous mixture is 22L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%; Intermediate layer welding condition: electric current is 280A, voltage is 29.5V, Ar/CO
2the gas flow of gaseous mixture is 23L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%; Capping layer welding condition: electric current is 320A, voltage is 32V, Ar/CO
2the gas flow of gaseous mixture is 23.5L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%; Obtain welding rear nozzle of steam turbine;
Six, after-baking: at temperature is 320 DEG C, after heat is carried out to nozzle of steam turbine after welding and to disappear hydrogen process, after heat disappears hydrogen process 2h, obtains after heat and to disappear nozzle of steam turbine after hydrogen process;
Seven, post weld heat treatment: enter stove be warming up to 740 DEG C with 70 DEG C/h programming rate after heat disappeared nozzle of steam turbine after hydrogen process, and 6h is incubated at temperature is 740 DEG C, then 200 DEG C are cooled to 55 DEG C/h, then natural air cooling is cut off the electricity supply to room temperature, namely the narrow gap MIG completing nozzle of steam turbine welds, and obtains welding rear nozzle of steam turbine.
To the weld seam of nozzle of steam turbine after welding by JB/T4730.3 " detections of bearing device nondestructive inspection the 3rd portion of ultrasonic sound wave " reach I grade qualified, to the face of weld welding afterwards nozzle of steam turbine by JB/T4730.4 " bearing device nondestructive inspection the 4th part Magnetic testing " reach I grade qualified.
Claims (9)
1. the narrow gap MIG welding method of nozzle of steam turbine, is characterized in that it completes according to the following steps:
One, welds prepares: machining is carried out to nozzle sets bevel for welding size, the root face obtaining position to be welded is the nozzle sets to be welded of 2 ± 0.25mm, machining is carried out to nozzle box's bevel for welding size, the root face obtaining position to be welded is the nozzle box to be welded of 2 ± 0.25mm, and ensure nozzle sets to be welded and nozzle box to be welded weld before under confined state groove gap should≤1mm;
Two, preweld cleaning: clear up nozzle sets to be welded and surface, nozzle box to be welded respectively, removes corrosion, oxide skin, coating, greasy dirt, missible oil liquid and foul, obtains clean nozzle sets and clean nozzle box;
Three, assemble: clean nozzle sets is assembled in clean nozzle box, and ensure that groove width must not be less than 8mm, then carry out spot welding and fix, obtain nozzle of steam turbine to be welded;
Four, preheating: nozzle of steam turbine to be welded entirety is evenly preheated to 150 ~ 200 DEG C from room temperature with the heating rate of≤150 DEG C/h, obtains nozzle of steam turbine after preheating;
Five, welding: nozzle of steam turbine after preheating is put on positioner, look for axiality < 0.5mm between the center of the bevel for welding of nozzle of steam turbine after preheating and welding turntable, again nozzle of steam turbine after preheating and positioner are carried out clamping and fixing, then narrow gap MIG welding equipment is utilized to carry out wire feed welding, the filling welding of multilayer single track is carried out between the bevel for welding of nozzle of steam turbine after preheat, its welding sequence is followed successively by prime coat, intermediate layer and capping layer, and after preheating, the bevel for welding surface temperature of nozzle of steam turbine must not lower than 150 DEG C during welding, prime coat welding parameter is: electric current is 220 ~ 260A, voltage is 27 ~ 29V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, intermediate layer welding parameter is: electric current is 270 ~ 300A, and voltage is 29 ~ 30V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, capping layer welding parameter is: electric current is 300 ~ 320A, and voltage is 30 ~ 32V, Ar/CO
2the gas flow of gaseous mixture is 20L/min ~ 25L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%, obtain welding rear nozzle of steam turbine,
Six, after heat disappears hydrogen process: postwelding carries out after heat to nozzle of steam turbine after welding and to disappear hydrogen process at temperature is 300 ~ 350 DEG C, and after heat hydrogen processing time that disappears is 2h ~ 3h, obtains after heat and to disappear the nozzle of steam turbine after hydrogen process;
Seven, post weld heat treatment: enter stove be warming up to 740 ± 10 DEG C with the programming rate of≤80 DEG C/h after heat the disappeared nozzle of steam turbine entirety after hydrogen process, and 6h ~ 8h is incubated at temperature is 740 ± 10 DEG C, then 150 ~ 200 DEG C are cooled to the cooling rate of≤60 DEG C/h, then cut off the electricity supply natural air cooling to room temperature, the narrow gap MIG namely completing nozzle of steam turbine welds.
2. the narrow gap MIG welding method of nozzle of steam turbine according to claim 1, it is characterized in that in step 3, clean nozzle sets being assembled in clean nozzle box, and groove gap is 8mm ~ 10mm, then carries out spot welding and fix, obtain nozzle of steam turbine to be welded.
3. the narrow gap MIG welding method of nozzle of steam turbine according to claim 1, it is characterized in that in step 4 with the heating rate of 100 DEG C/h ~ 150 DEG C/h, nozzle of steam turbine entirety to be welded is evenly preheated to 150 ~ 200 DEG C from room temperature, obtains the nozzle of steam turbine after preheating.
4. the narrow gap MIG welding method of nozzle of steam turbine according to claim 1, it is characterized in that prime coat welding condition in step 5: electric current is 230A ~ 250A, voltage is 27.2V ~ 28.5V, Ar/CO
2the gas flow of gaseous mixture is 21L/min ~ 24L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%.
5. the narrow gap MIG welding method of nozzle of steam turbine according to claim 1, it is characterized in that intermediate layer welding condition in step 5: electric current is 270A ~ 290A, voltage is 29.2V ~ 29.8V, Ar/CO
2the gas flow of gaseous mixture is 21L/min ~ 24L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%.
6. the narrow gap MIG welding method of nozzle of steam turbine according to claim 1, it is characterized in that step 5 middle cover surface layer welding condition: electric current is 320A, voltage is 32V, Ar/CO
2the gas flow of gaseous mixture is 23L/min ~ 24L/min, Ar/CO
2in gaseous mixture, the volume fraction of Ar is 85%, CO
2volume fraction be 15%.
7. the narrow gap MIG welding method of nozzle of steam turbine according to claim 1, to it is characterized in that in step 6 that at temperature is 300 ~ 330 DEG C, carry out after heat to nozzle of steam turbine after welding disappears hydrogen process, after heat disappears hydrogen process 2 ~ 3h, obtains after heat and to disappear the nozzle of steam turbine after hydrogen process.
8. the narrow gap MIG welding method of nozzle of steam turbine according to claim 1, it is characterized in that in step 7 with the heating rate of 60 DEG C/h ~ 80 DEG C/h, the nozzle of steam turbine entirety after hydrogen process that after heat disappeared is warming up to 740 ± 10 DEG C, and is incubated 6 ~ 8h at temperature is 740 ± 10 DEG C.
9. the narrow gap MIG welding method of nozzle of steam turbine according to claim 1, it is characterized in that in step 7 with the cooling rate of 50 DEG C/h ~ 60 DEG C/h, be cooled to 150 ~ 200 DEG C, natural air cooling of then cutting off the electricity supply is to room temperature, and the narrow gap MIG namely completing nozzle of steam turbine welds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510465442.8A CN105081536A (en) | 2015-07-31 | 2015-07-31 | Narrow-gap MIG welding method of turbine nozzles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510465442.8A CN105081536A (en) | 2015-07-31 | 2015-07-31 | Narrow-gap MIG welding method of turbine nozzles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105081536A true CN105081536A (en) | 2015-11-25 |
Family
ID=54563352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510465442.8A Pending CN105081536A (en) | 2015-07-31 | 2015-07-31 | Narrow-gap MIG welding method of turbine nozzles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105081536A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345231A (en) * | 2015-11-27 | 2016-02-24 | 东方电气集团东方汽轮机有限公司 | Large-thickness martensitic heat-resistant steel clapboard electron beam composite narrow-gap metal active gas (MAG) welding method |
| CN108705185A (en) * | 2018-07-20 | 2018-10-26 | 四川汇源钢建装配建筑有限公司 | A kind of method and weldment of 0.8mm welding wires welding narrow gap |
| CN108890093A (en) * | 2018-07-20 | 2018-11-27 | 四川汇源钢建装配建筑有限公司 | A kind of narrow gap welding method and weldment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55133871A (en) * | 1979-04-09 | 1980-10-18 | Nippon Kokan Kk <Nkk> | Narrow groove arc welding method |
| JPH04158983A (en) * | 1990-10-19 | 1992-06-02 | Mitsubishi Heavy Ind Ltd | Narrow gap welding torch |
| JP2002178150A (en) * | 2000-12-12 | 2002-06-25 | Denso Corp | Automatic narrow gap profiling method |
| CN1806991A (en) * | 2006-02-08 | 2006-07-26 | 江苏科技大学 | Gas protection method and apparatus for rotating arc narrow gap welding |
| CN1907627A (en) * | 2006-08-14 | 2007-02-07 | 哈尔滨汽轮机厂有限责任公司 | Method of welding steam turbine nozzle by electron beam |
| CN101972885A (en) * | 2010-09-16 | 2011-02-16 | 西北工业大学 | Bushing-free narrow-gap pulse gas metal arc backing welding method of petroleum kelly bar |
-
2015
- 2015-07-31 CN CN201510465442.8A patent/CN105081536A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55133871A (en) * | 1979-04-09 | 1980-10-18 | Nippon Kokan Kk <Nkk> | Narrow groove arc welding method |
| JPH04158983A (en) * | 1990-10-19 | 1992-06-02 | Mitsubishi Heavy Ind Ltd | Narrow gap welding torch |
| JP2002178150A (en) * | 2000-12-12 | 2002-06-25 | Denso Corp | Automatic narrow gap profiling method |
| CN1806991A (en) * | 2006-02-08 | 2006-07-26 | 江苏科技大学 | Gas protection method and apparatus for rotating arc narrow gap welding |
| CN1907627A (en) * | 2006-08-14 | 2007-02-07 | 哈尔滨汽轮机厂有限责任公司 | Method of welding steam turbine nozzle by electron beam |
| CN101972885A (en) * | 2010-09-16 | 2011-02-16 | 西北工业大学 | Bushing-free narrow-gap pulse gas metal arc backing welding method of petroleum kelly bar |
Non-Patent Citations (4)
| Title |
|---|
| 唐志超，王进军: "汽轮机隔板窄间隙深坡口MAG自动焊接的工艺研究", 《机械工程师》 * |
| 洪松涛等: "《简明焊工手册第三版》", 31 January 2008, 上海科学技术出版社 * |
| 王广成，于明明: "窄间隙焊技术在隔板中的应用", 《中国新技术新产品》 * |
| 黄勇，张慧: "大厚度环形板对接产品窄间隙深坡口MIG焊工艺研究", 《2010中国焊接产业论坛论文集》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345231A (en) * | 2015-11-27 | 2016-02-24 | 东方电气集团东方汽轮机有限公司 | Large-thickness martensitic heat-resistant steel clapboard electron beam composite narrow-gap metal active gas (MAG) welding method |
| CN105345231B (en) * | 2015-11-27 | 2017-07-28 | 东方电气集团东方汽轮机有限公司 | Big thickness martensite heat-resistant steel dividing plate electron beam is combined narrow gap MAG welding methods |
| CN108705185A (en) * | 2018-07-20 | 2018-10-26 | 四川汇源钢建装配建筑有限公司 | A kind of method and weldment of 0.8mm welding wires welding narrow gap |
| CN108890093A (en) * | 2018-07-20 | 2018-11-27 | 四川汇源钢建装配建筑有限公司 | A kind of narrow gap welding method and weldment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101780591B (en) | Twin arc submerged arc welding method for thick plate box beam/pillar | |
| CN106862771B (en) | A kind of laser assisted melt pole electrical arc increasing material connection method for high temperature alloy | |
| CN107999950B (en) | A kind of middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing | |
| CN108544093B (en) | A kind of low-alloy steel low power laser-electric arc combined all-position welding method | |
| CN105665933A (en) | Laser-arc hybrid welding method for Invar die steel | |
| CN103084703A (en) | Method for patching, overlay welding and reproducing large-scale hollow steel casting | |
| CN103212913A (en) | Fitting up and welding method of major-diameter thin-wall stainless steel bellows | |
| CN105983752A (en) | Low-alloy steel pipe welding process | |
| CN105081536A (en) | Narrow-gap MIG welding method of turbine nozzles | |
| CN102941403B (en) | Welding process of narrow-gap submerged arc welding for shell flange | |
| CN103464873B (en) | Electric-arc welding process for Ti alloy and nickel-base high-temperature alloy | |
| CN107984105A (en) | The welding procedure of wind power tower S355NL steel | |
| CN104999181B (en) | A kind of laser InFocus electric arcs bifocus complex welding method | |
| CN108788385A (en) | It is the stainless steel clad plate welding method of cladding by base, 904L stainless steels of Q345R low-alloy steel | |
| CN102319951B (en) | Electron beam welding method for large-thickness diaphragms of steam turbines | |
| CN103600204A (en) | Production method for friction stir brazing aluminum alloy composite wheel | |
| CN103624377B (en) | Box shaped support panel welding shaping method | |
| CN110328449A (en) | A kind of laser-MIG electric arc complex welding method of pipeline steel medium plate | |
| CN106695065A (en) | T-shaped plate one-side welding pulse bottoming welding method | |
| CN105983761A (en) | High-strength steel welding process | |
| CN112296507B (en) | Friction stir welding method for aluminum alloy water-cooled motor shell | |
| CN103480973B (en) | A kind of hollow stationary blade of steam turbine cold metal transfer three sections of welding methods | |
| CN108453355A (en) | A kind of welding method and steel part of ultra-thick steel plates | |
| CN110328492B (en) | A-TIG welding repair compound method for long cracks of aero-engine turbine rear casing support plate | |
| CN103084716B (en) | Pulse gas metal arc welding technology of titanium-aluminium micro laminated composite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151125 |
|
| WD01 | Invention patent application deemed withdrawn after publication |