CN102284772A - Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine - Google Patents
Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine Download PDFInfo
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- CN102284772A CN102284772A CN2011102470012A CN201110247001A CN102284772A CN 102284772 A CN102284772 A CN 102284772A CN 2011102470012 A CN2011102470012 A CN 2011102470012A CN 201110247001 A CN201110247001 A CN 201110247001A CN 102284772 A CN102284772 A CN 102284772A
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Abstract
The invention discloses an argon arc back sealing welding method for a housing of a low-pressure water supply heater of a third-generation nuclear power steam turbine and relates to the back sealing welding method for the housing of the low-pressure water supply heater of the third-generation nuclear power steam turbine. The method is used for solving the problems of poor welding quality, higher back repair rate and single pass difficulty in radiographic inspection because a wire-filling argon arc welding process, a gas shield welding process or a submerged-arc welding filling process is adopted for the back sealing welding of the housing of the low-pressure water supply heater of the steam turbine at present. The method comprises the following steps: 1) processing bevels on the butt joint end surfaces of two workpieces to be welded, wherein each bevel is in the shape of U and a bulge is arranged on the bottom surface of each U-shaped bevel; 2) preparing before welding; 3) clearing before welding; 4) assembling; 5) performing butt welding on the U-shaped bevels of the two workpieces to be welded by adopting the self-fluxing argon arc welding way without a filler wire, wherein the welding current is 110-180V, the welding speed is 6-10cm/minute, the swing distance of a welding gun is 5-20mm and the swing angle of the welding gun is 5-20 degrees; 6) performing heat treatment after welding; and 7) performing non-destructive flaw detection. The argon arc back sealing welding method is used for the back sealing welding of the housing of the low-pressure water supply heater of the third-generation nuclear power steam turbine.
Description
Technical field
The present invention relates to a kind of third generation nuclear steam turbine low-pressure feed heater housing back cover welding method.
Background technology
Steam turbine low-pressure feed-water heater (one of thermal power steam turbine subsidiary engine), be one of power station heat regenerative system Important Auxiliary equipment equipment, its purposes is to adopt extracted steam from turbine heat-setting water and feedwater, reduce the heat loss of turbine discharge, thereby steam thermal energy is fully used, improves generating set heat efficiency.Third generation nuclear steam turbine low-pressure heater design temperature is about 120 ℃, about test pressure 6.05MPa, therefore low-pressure feed heater housing welding quality, safety of welding seam coefficient require high, especially to the last one girth joint seal welding of low-pressure feed heater housing, require highlyer, as go wrong, for nuclear power, for a short time, then will directly have influence on the safe operation of unit, greatly then consequence can't be estimated.At present, for the last one girth joint seal welding of low-pressure feed heater housing, all adopt traditional silk filling argon arc welding back cover both at home and abroad, gas is protected the technology of weldering or submerged-arc welding filling, poor welding quality, and repair rate is higher, and radiographic inspection is difficult to once pass through.
Summary of the invention
The purpose of this invention is to provide a kind of third generation nuclear steam turbine low-pressure feed heater housing argon arc back cover welding method, weld at steam turbine low-pressure feed-water heater housing back cover to solve at present, adopt the argon arc welding that fills silk, gas is protected weldering or submerged-arc welding fill process, poor welding quality, repair rate is higher, and radiographic inspection is difficult to one-pass problem.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: third generation nuclear steam turbine low-pressure feed heater housing argon arc back cover welding method of the present invention, and it is characterized in that: described method is finished according to the following steps:
At the butt joint end of two workpiece to be welded finished edge, groove be shaped as U-shaped, the bottom surface of U-shaped groove is provided with projection; Described two workpiece to be welded are two housings of low-pressure feed heater to be welded;
Prepare before step 2, the weldering:
Check the wall thickness and the surface smoothness at the position to be welded of two workpiece to be welded, make described position to be welded meet welding requirements;
Surface to two workpiece to be welded and workbench and each frock clamp is cleared up, and makes two workpiece to be welded and workbench and each frock clamp reach welded condition;
Step 4, assembling:
Two workpiece to be welded are fixed on the workbench, be adjusted to the state that two workpiece to be welded are butt welding, on the lateral wall of two workpiece to be welded, be positioned at eight baffle plates of the uniform placement of butt weld place, check the fit-up gap, allow local maximal clearance to be no more than 1.0mm, unfitness of butt joint is not more than 1.0mm;
Step 5, welding:
At first the lateral wall with two workpiece to be welded carries out means of spot welds with eight baffle plates respectively, U-shaped groove place to two workpiece to be welded adopts the mode that does not fill silk from molten argon arc welding to carry out butt welding and then, welding current is that 110-180V, speed of welding are 6-10cm/min, the torch swinging distance is 5-20mm, the torch swinging angle is 5-20 °, obtain the weld seam reverse side and be shaped evenly, the starting the arc, the normal weld seam of receipts arc remove eight baffle plates at last;
Step 6, post weld heat treatment:
Workpiece after the welding is carried out local destressing heat treatment, and heat treatment temperature is 625 ± 25 ℃, and programming rate is 80 ℃/h, lowers the temperature behind the insulation 1.9-20h, and cooling rate is 60 ℃/h, freely is cooled to room temperature when temperature drops to below 200 ℃;
Step 7: nondestructive inspection detects:
Workpiece after the welding is carried out the x-ray carrying out flaw detection, make that the workpiece after the welding adheres to specification.
The invention has the beneficial effects as follows: the present invention is by designing 1,000,000 nuclear power low-pressure feed heater housing groove types, adopt argon arc welding to carry out engineer testing from the welding method of the molten form that do not fill silk, and grope to obtain one by test and overlap the optimal processing parameter that is fit to the housing welding, the housing welding procedure experiment of intact millions of nuclear power low-pressure feed heaters, and sample has been carried out the nondestructive inspection test, the requirement that test result satisfies design and produces.The present invention adopts novel groove type, and adopts not fill silk and weld from molten argon arc welding back cover, by changing welding current, speed of welding, torch swinging distance and angle, select rational welding parameter, realize single face welding and double face shaping, obviously improved welding quality, reduced repair rate; Raise the efficiency, shorten the manufacturing cycle, reduced manufacturing cost.
Description of drawings
Fig. 1 is the front view after with method of the present invention third generation nuclear steam turbine low-pressure feed heater housing argon arc back cover being welded, Fig. 2 is the A place partial enlarged drawing among Fig. 1, arc surface one side of U-shaped groove place band projection is the lateral surface of workpiece to be welded among the figure, and U-shaped groove bottom face one side is the medial surface of workpiece to be welded.
The specific embodiment
The specific embodiment one: in conjunction with Fig. 1 and Fig. 2 explanation, the third generation nuclear steam turbine low-pressure feed heater housing argon arc back cover welding method of present embodiment, described method is finished according to the following steps:
At the butt joint end of two workpiece 1 to be welded finished edge, groove be shaped as U-shaped, the bottom surface of U-shaped groove 2 is provided with projection 3; Described two workpiece 1 to be welded are two housings of low-pressure feed heater to be welded;
Prepare before step 2, the weldering:
Check the wall thickness w and the surface smoothness at the position to be welded of two workpiece 1 to be welded, make described position to be welded meet welding requirements;
Surface to two workpiece 1 to be welded and workbench and each frock clamp is cleared up, and makes two workpiece 1 to be welded and workbench and each frock clamp reach welded condition;
Step 4, assembling:
Two workpiece 1 to be welded are fixed on the workbench, be adjusted to the state that two workpiece 1 to be welded are butt welding, on the lateral wall of two workpiece 1 to be welded, be positioned at eight baffle plates of the uniform placement of butt weld place, check fit-up gap (promptly checking the gap of two workpiece joints to be welded), allow local maximal clearance to be no more than 1.0mm, unfitness of butt joint is not more than 1.0mm;
Step 5, welding:
At first the lateral wall with two workpiece 1 to be welded carries out means of spot welds (playing fixing effect before two workpiece welderings to be welded) with eight baffle plates respectively, U-shaped groove 2 places to two workpiece 1 to be welded adopt the mode that does not fill silk from molten argon arc welding (employing argon arc welding machine) to carry out butt welding and then, welding current is that 110-180V, speed of welding are 6-10cm/min, the torch swinging distance is 5-20mm, the torch swinging angle is 5-20 °, obtaining the weld seam reverse side is shaped evenly, the starting the arc, the normal weld seam of receipts arc remove eight baffle plates at last;
Step 6, post weld heat treatment:
Workpiece after the welding is carried out local destressing heat treatment, and heat treatment temperature is 625 ± 25 ℃, and programming rate is 80 ℃/h, lowers the temperature behind the insulation 1.9-20h, and cooling rate is 60 ℃/h, freely is cooled to room temperature when temperature drops to below 200 ℃;
Step 7: nondestructive inspection detects:
Workpiece after the welding is carried out the x-ray carrying out flaw detection, make that the workpiece after the welding adheres to specification.
Workpiece after the welding detects by nondestructive inspection, and the workpiece after the welding meets I grade standard (ASME standard) requirement.
The specific embodiment two: in conjunction with Fig. 1 and Fig. 2 explanation, in the step 2 of present embodiment, the wall thickness w of two workpiece 1 to be welded is 40mm; In the step 3,, deashing is carried out on the surface of workbench and each frock clamp handle the processing that corrosion, oxide skin, coating, greasy dirt, missible oil liquid and foul (can adopt machinery or chemical method cleaning) are removed in each surface of two workpiece 1 to be welded; In the step 4, allow local maximal clearance to be no more than 1.0mm; In the step 5, welding current is that 150V, speed of welding are 8cm/min, and the torch swinging distance is 15mm, and the torch swinging angle is 15 °; In the step 6, heat treatment temperature is 625 ℃, and programming rate is 80 ℃/h, lowers the temperature behind the insulation 3h.Other is identical with the specific embodiment one.
Claims (2)
1. third generation nuclear steam turbine low-pressure feed heater housing argon arc back cover welding method, it is characterized in that: described method is finished according to the following steps:
Step 1, finished edge:
At the butt joint end finished edge of two workpiece (1) to be welded, groove be shaped as U-shaped, the bottom surface of U-shaped groove (2) is provided with projection (3); Described two workpiece (1) to be welded are two housings of low-pressure feed heater to be welded;
Prepare before step 2, the weldering:
Check the wall thickness (w) and the surface smoothness at the position to be welded of two workpiece (1) to be welded, make described position to be welded meet welding requirements;
Step 3, preweld cleaning:
Surface to two workpiece (1) to be welded and workbench and each frock clamp is cleared up, and makes two workpiece (1) to be welded and workbench and each frock clamp reach welded condition;
Step 4, assembling:
Two workpiece (1) to be welded are fixed on the workbench, be adjusted to the state that two workpiece (1) to be welded are butt welding, on the lateral wall of two workpiece (1) to be welded, be positioned at eight baffle plates of the uniform placement of butt weld place, check fit-up gap (promptly checking the gap of two workpiece joints to be welded), allow local maximal clearance to be no more than 1.0mm, unfitness of butt joint is not more than 1.0mm;
Step 5, welding:
At first the lateral wall with two workpiece (1) to be welded carries out means of spot welds (playing fixing effect before two workpiece welderings to be welded) with eight baffle plates respectively, locate to adopt the mode that does not fill silk from molten argon arc welding (employing argon arc welding machine) to carry out butt welding to the U-shaped groove (2) of two workpiece (1) to be welded and then, welding current is that 110-180V, speed of welding are 6-10cm/min, the torch swinging distance is 5-20mm, the torch swinging angle is 5-20 °, obtaining the weld seam reverse side is shaped evenly, the starting the arc, the normal weld seam of receipts arc remove eight baffle plates at last;
Step 6, post weld heat treatment:
Workpiece after the welding is carried out local destressing heat treatment, and heat treatment temperature is 625 ± 25 ℃, and programming rate is 80 ℃/h, lowers the temperature behind the insulation 1.9-20h, and cooling rate is 60 ℃/h, freely is cooled to room temperature when temperature drops to below 200 ℃;
Step 7: nondestructive inspection detects:
Workpiece after the welding is carried out the x-ray carrying out flaw detection, make that the workpiece after the welding adheres to specification.
2. a kind of third generation nuclear steam turbine low-pressure feed heater housing argon arc back cover welding method according to claim 1, it is characterized in that: in the step 2, the wall thickness w of two workpiece (1) to be welded is 40mm; In the step 3,, deashing is carried out on the surface of workbench and each frock clamp handle the processing that corrosion, oxide skin, coating, greasy dirt, missible oil liquid and foul (can adopt machinery or chemical method cleaning) are removed in each surface of two workpiece (1) to be welded; In the step 4, allow local maximal clearance to be no more than 1.0mm; In the step 5, welding current is that 150V, speed of welding are 8cm/min, and the torch swinging distance is 15mm, and the torch swinging angle is 15 °; In the step 6, heat treatment temperature is 625 ℃, and programming rate is 80 ℃/h, lowers the temperature behind the insulation 3h.
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| CN 201110247001 CN102284772B (en) | 2011-08-25 | 2011-08-25 | Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine |
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| CN 201110247001 CN102284772B (en) | 2011-08-25 | 2011-08-25 | Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine |
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Cited By (5)
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| CN102962557A (en) * | 2012-11-06 | 2013-03-13 | 哈尔滨汽轮机厂有限责任公司 | Method for welding balancing air leakage pipe of medium-high pressure outer cylinder in turbine |
| CN103567610A (en) * | 2013-10-19 | 2014-02-12 | 沈阳黎明航空发动机(集团)有限责任公司 | Fuel oil header pipe process pin oil leakage repairing method |
| CN105618904A (en) * | 2016-02-23 | 2016-06-01 | 中信重工机械股份有限公司 | Narrow-gap submerged-arc welding groove structure of large thick-wall oil cylinder and assembling and welding method |
| CN106735752A (en) * | 2016-11-22 | 2017-05-31 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of large-scale cantilevered thin walled welds part is damaged cellular repair method |
| CN113543928A (en) * | 2019-03-14 | 2021-10-22 | 卡特彼勒公司 | Method for producing a structural component for connection to another structural component by means of stress-shielded groove welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102962557A (en) * | 2012-11-06 | 2013-03-13 | 哈尔滨汽轮机厂有限责任公司 | Method for welding balancing air leakage pipe of medium-high pressure outer cylinder in turbine |
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| CN103567610B (en) * | 2013-10-19 | 2016-12-07 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of fuel manifold technique pin leakage of oil restorative procedure |
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| CN105618904B (en) * | 2016-02-23 | 2018-10-16 | 中信重工机械股份有限公司 | A kind of assembling and welding process of the narrow-clearance submerged arc welding divided edge structure of large thick-wall oil cylinder |
| CN106735752A (en) * | 2016-11-22 | 2017-05-31 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of large-scale cantilevered thin walled welds part is damaged cellular repair method |
| CN113543928A (en) * | 2019-03-14 | 2021-10-22 | 卡特彼勒公司 | Method for producing a structural component for connection to another structural component by means of stress-shielded groove welding |
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Effective date of registration: 20221223 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN TURBINE Co.,Ltd. Patentee after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Patentee before: HARBIN TURBINE Co.,Ltd. |
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