CN105983759B - Steel feed bin assembling and welding method under high humidity environment - Google Patents
Steel feed bin assembling and welding method under high humidity environment Download PDFInfo
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Abstract
Steel feed bin assembling and welding method under a kind of high humidity environment, it is characterised in that including following technical measures：The flashing, wind proofing canopy of welding, the control of b welding materials, the assembling of c steel feed bins, d steel feed bin barrel solderings is arranged in a.Steel feed bin assembling and welding method has under the high humidity environment of the present invention is increased with few cost, overcome the crucial problem of steel feed bin engineering construction under high humidity environment, obtain good effect, the advantages of ensureing steel feed bin engineering construction quality and progress under high humidity environment, shortening the construction period and reduce engineering cost.
Description
Technical field
The present invention relates to a kind of welding methods, specifically, being steel feed bin assembling and welding method under a kind of high humidity environment.
Background technology
More the quiet steel works sintering engineering in the Nanhe River is located in the coastal areas Vietnam Zhong Bei, belongs to tropical monsson climate, and temperature is high（Nian Ping
Equal 25 DEG C of temperature）, the annual 7-11 months often suffer typhoon, summer is influenced seriously by monsoon；Thunder and lightning is more；Abundant rainfall, annual September
It is rainy season to March in the coming year, average annual rainfall reaches 1800-2000 millimeters, and up to 3000-4000 millimeters, air humidity is frequent
It is maintained at 90% or more, and the wet weather duration is very long.Fuel reservoir room, fuel coarse crushing room, combustion in sintering project
Amounting in material fine crushing room, quick lime and dust proportioning room, main proportioning room has 51 steel feed bins, after being domestic partition machining,
Vietnam construction site is reached by sea-freight.The welding capacity of steel feed bin is very big, and weldquality requires high in addition, need to be in outdoor assembling
Welding, due to duration wet weather, welding quality control difficulty is very big under high humidity environment.If stopping welding job, Shi Biying
Project progress is rung, the waste of a large amount of material resources, manpower is caused；If adhering to normal welding measure, construction quality certainly will be influenced, to the present
Production run afterwards constitutes great threat.
Therefore known steel feed bin assembling and welding method there are problems that it is above-mentioned various inconvenient and.
Invention content
The purpose of the present invention, be to propose it is a kind of suitable for each similar round, rectangular, welding polymorphic structure steel feed bin room outside
Steel feed bin assembling and welding method under high humidity environment.
To achieve the above object, technical solution of the invention is：
Steel feed bin assembling and welding method under a kind of high humidity environment, it is characterised in that including following technical measures：
A, the flashing, wind proofing canopy of welding is set
The flashing, wind proofing canopy of welding is set, measures air humidity in flashing, wind proofing canopy, relative humidity at any time with hygronom
It is irradiated using more iodine-tungsten lamps when more than 90%；
B, the control of welding material, includes the following steps：
（1）Welding rod is dried as required using preceding, heat-preservation cylinder is held and gets welding rod, covers heat preservation cover, welding rod with
With taking, forbid to dissipate on the spot；
（2）CO2Gas cylinder should be placed in 0 DEG C of environment above, should be inverted in advance before use, open valve and water is drained use；
（3）Select the good hydrogen controlled electrode of impact flexibility, take high tenacity ultralow hydrogen type welding rod when necessary, welding wire it is carbon containing
Amount<0.12%；Sulphur phosphorus content controls below 0.03%；CO2Gas purity not preferably less than 99.9% (volume ratio)；Water content must not
More than 0.005% (mass ratio)；
（4）Welding material should set special messenger and be responsible for keeping, nonvoluntary to dismantle electrode packaging, accomplish as possible it is current now tear open, be soldered
Remaining welding rod is sealed afterwards；Every welder matches a heat-preservation cylinder, and welding rod is placed in heat-preservation cylinder；
C, steel feed bin assembles, by ring beam and lower part circular cylinder body group at the IIth section, ring beam upper circular cylinder section group pair
At I section, while by tapered bucket group at the IIIth section, top plate being finally spliced into full wafer, is included the following steps：
（1）It is drawn and is justified with 8200mm diameters on assembly platform, then determine circle with 45 ° of 8 sections of average marks and on platform
Position, 45 ° of anchor points weld 8 root posts on the inside of the steel feed bin cylinder that will be assembled, and block are welded between cylinder and column, column makes
With HW300*200 shaped steel, height 3500mm, using No. 16 channel steel bearing diagonal vertical columns, block uses 20mm steel plates, then exists
1 3t jack is respectively hung on column；
（2）Steel feed bin cylinder cross joint is fixed using fixture when assembling, and after one section is completed, cylinder is checked using instrument
The deviation data of circularity, perimeter, verticality, concentricity after passed examination, stands every that spot welding is fixed respectively to weld seam；Then
Using cylinder is enclosed under 20t crane lifting cylinders, every section of cylinder docking is fixed using fixture, and there are certain welded gaps, two sections
Cylinder longitudinal seam is at least staggered 400mm or more；Finally as requested to the barrel soldering after assembling；
D, steel feed bin barrel soldering, including following technical measures：
（1）Make groove processing before steel feed bin barrel soldering, with abrasive machine by paint, iron rust, paint existing for groove region
Pollutant is disposed, and checks node population size and weld bond assembly clearance；It, will using oxyacetylene torch when welding point humidity
Moisture within the scope of the 100mm of groove both sides between play movement is thoroughly dried just solderable and 100mm ranges at weldering is pre-
Heat >=50 degree is irradiated in the position placement iodine-tungsten lamp apart from weld bond 1m or so, prevents in welding process moisture accumulation on slope
Mouth region domain；
（2）Weld specification in each position of steel feed bin cylinder：
1）Top plate：Thickness 6mm, material Q235B, seam arrangements are overlap joint；
2）Ring beam upper shell：Thickness 14mm, material Q235B, seam arrangements are docking；
3）Ring beam：Thickness 22mm, material Q235B, seam arrangements are docking；
（3）Each position weld seam processing of steel feed bin cylinder：
1）Throat depth ＜ 6mm, manual electric arc welding weld one layer after back chipping；
2）One layer of twice are welded in longitudinal joint thickness >=6mm, manual electric arc welding after back chipping；
（4）Each position welding condition of steel feed bin cylinder：
1）Welding position：Flat, vertical, transverse presentation；Bottom, arc welding, filling metal J422 fill metal to welding method by hand
Diameter 3.2mm, 105~165A of welding current, 20~22V of arc voltage, 5~8cm/min of speed of welding；
2）Welding position：Flat, vertical, transverse presentation；Two layers, arc welding, filling metal J422 fill metal to welding method by hand
Diameter 4mm, 160~180A of welding current, 24~26V of arc voltage, 12~16cm/min of speed of welding；
（5）Welding procedure
Longitudinal seam is first welded, then weld-ring weld seam；Girth joint uses symmetrical chiasma welding method, point 8 people at 4 groups simultaneously
Welding, every group of 2 people, using therefrom dividing outside skip welding method, skip welding length 500mm；Every section of weld seam is numbered, content packet
Component number, weld seam number, welding method, welder's name, date are included, accomplishes there is trackability；Welding completes that weld appearance should be carried out
Inspection and ultrasonic flaw detection；It was found that defect is rectified and improved in time, while finding out the reason of generating defect, take for measure
Prevent the generation again of defect.
Steel feed bin assembling and welding method can also be using technical measures below come further under the high humidity environment of the present invention
It realizes.
Method above-mentioned, wherein in the step a, when weld job area wind speed when manual electric arc welding is more than 8m/s, gas
The flashing, wind proofing canopy of welding is set when shielded arc welding and flux cored wire arc welding are more than 2m/s.
Method above-mentioned, wherein in the step a, when there are draught or air blower in weld job area in weldering atelier
The flashing, wind proofing canopy of welding is set.
The flashing, wind proofing canopy of welding is arranged when weldment surface moisture wherein in the step a for method above-mentioned.
Method above-mentioned, wherein the flashing, wind proofing canopy steel pipe or angle steel set up shelf, ceiling installs color steel, surrounding
Plug-in windproof, fire prevention, waterproof cloth, bottom plate are preferably mated formation heat-isolating flame retardant material.
Method above-mentioned, wherein the fixture is voussoir, U-shaped block and strength cushion block are composed.
After adopting the above technical scheme, steel feed bin assembling and welding method has the following advantages under the high humidity environment of the present invention：
1, increased with few cost, overcome the crucial problem of steel feed bin engineering construction under high humidity environment, achieve good
Good effect, to avoid the cost that must implement alternative solution and bring from increasing；
2, ensure steel feed bin engineering construction quality and progress under high humidity environment；
3, shorten the construction period, shorten 250t crawler cranes be detained scene time and save machinery expenses, reduce engineering at
This.
Description of the drawings
Fig. 1 is that the steel feed bin cylinder of the embodiment of the present invention assembles vertical view；
Fig. 2 is the steel feed bin cylinder assembling schematic diagram of the embodiment of the present invention；
Fig. 3 is the lifting schematic diagram of circle cylinder and lower circle cylinder on the steel feed bin cylinder of the embodiment of the present invention；
Fig. 4 is the assembled schematic diagram of circle cylinder and lower circle cylinder on the steel feed bin cylinder of the embodiment of the present invention；
Fig. 5 is the voussoir schematic diagram of the embodiment of the present invention；
Fig. 6 is the U-shaped block schematic diagram of the embodiment of the present invention；
Fig. 7 is the strength cushion block schematic diagram of the embodiment of the present invention；
Fig. 8 is that the assembled fixture of circle cylinder and lower circle cylinder uses schematic diagram on the steel feed bin cylinder of the embodiment of the present invention；
Fig. 9 is the welding sequence and direction schematic diagram of two weld seams of the steel feed bin of the embodiment of the present invention.
In figure：Enclose cylinder on 1,2 times circle cylinders, 3 jacks, 4 lifting lugs, 5 columns, 6 bearing diagonals, 7 platforms, 8 blocks, 9 voussoirs,
10U shape blocks, 11 strength cushion blocks, 12 the 1st weld seams, 13 the 2nd weld seams, 1-2-3-4 indicate the sequence of welding priority, → indicate weldering
Connect direction.
Specific implementation mode
With reference to embodiments and its attached drawing illustrates further the present invention.
Embodiment 1
Steel feed bin assembling and welding method under the high humidity environment of the present invention, it is characterised in that including following technical measures：
A, the flashing, wind proofing canopy of welding is set
The flashing, wind proofing canopy of welding is set, measures air humidity in flashing, wind proofing canopy, relative humidity at any time with hygronom
It is irradiated using more iodine-tungsten lamps when more than 90%；When weld job area wind speed when manual electric arc welding is more than 8m/s, gas shield
The flashing, wind proofing canopy of welding is set when arc welding and flux cored wire arc welding are more than 2m/s.Make when being welded in weldering atelier
The flashing, wind proofing canopy of welding is arranged in industry area when having draught or air blower.The rain-proof of welding is set when weldment surface moisture
Wind-proof shed.The flashing, wind proofing canopy steel pipe or angle steel set up shelf, and ceiling installs color steel, and the plug-in windproof, fire prevention of surrounding is prevented
Water cloth, bottom plate are preferably mated formation heat-isolating flame retardant material.
B, the control of welding material, including：
（1）Welding rod is dried as required using preceding, heat-preservation cylinder is held and gets welding rod, covers heat preservation cover, welding rod with
With taking, forbid to dissipate on the spot；
（2）CO2Gas cylinder should be placed in 0 DEG C of environment above, should be inverted in advance before use, opened valve and drained water and can make
With；
（3）Select the good hydrogen controlled electrode of impact flexibility, take high tenacity ultralow hydrogen type welding rod when necessary, welding wire it is carbon containing
Amount<0.12%；Sulphur phosphorus content controls below 0.03%；CO2Gas purity not preferably less than 99.9% (volume ratio)；Water content is not
It obtains more than 0.005% (mass ratio)；
（4）Welding material should set special messenger and be responsible for keeping, nonvoluntary to dismantle electrode packaging, accomplish as possible it is current now tear open, be soldered
Remaining welding rod is sealed afterwards；Every welder matches a heat-preservation cylinder, and welding rod is placed in heat-preservation cylinder；
Vertical view is assembled referring now to the steel feed bin cylinder that Fig. 1 and Fig. 1, Fig. 1 are the embodiment of the present invention, Fig. 2 is the present invention
The steel feed bin cylinder assembling schematic diagram of embodiment.
C, steel feed bin assembles, by ring beam and lower part circular cylinder body group at the IIth section, to ring beam upper circular cylinder section group
To at I section, while by tapered bucket group at the IIIth section, top plate being finally spliced into full wafer, is included the following steps：
（1）It is drawn and is justified with 8200mm diameters on assembly platform, then position with 45 ° of 8 sections of average marks and on platform circle,
45 ° of anchor points weld 8 root posts on the inside of the steel feed bin cylinder that will be assembled, and block is welded between cylinder and column, and column uses
HW300*200 shaped steel, height 3500mm, using No. 16 channel steel bearing diagonal vertical columns, block uses 20mm steel plates, then vertical
8 3t jacks are hung on column；
Fig. 3 is the lifting schematic diagram of circle cylinder and lower circle cylinder on the steel feed bin cylinder of the embodiment of the present invention, and Fig. 4 is this hair
The assembled schematic diagram of cylinder and lower circle cylinder is enclosed on the steel feed bin cylinder of bright embodiment.The steel feed bin cylinder assembling of the present invention uses
Assembly is commonly carried out by voussoir, U-shaped block and strength cushion block sub-assembly folding fixture in the cylinder assembling of steel storehouse.U-shaped block is welded admittedly
On upper and lower barrel wall, strength cushion block is penetrated, voussoir is inserted into and adjusts welding after barrel wall consistency up and down.Fig. 8 is the present invention
The assembled fixture that cylinder and lower circle cylinder are enclosed on the steel feed bin cylinder of embodiment uses schematic diagram.
（2）Steel feed bin cylinder cross joint is fixed using fixture when assembling, and after one section is completed, cylinder is checked using instrument
The deviation data of circularity, perimeter, verticality, concentricity after passed examination, stands every that spot welding is fixed respectively to weld seam；Then
Using tile on the downside of 20t crane liftings cylinders, every section of cylinder docking is fixed using self-control board, and there are certain welded gaps,
Two sections of cylinder longitudinal seams are at least staggered 400mm or more；Finally as requested to the barrel soldering after assembling；
D, steel feed bin welds, including following technical measures：
（1）Groove processing before steel feed bin barrel soldering must use abrasive machine will be oily existing for groove region before welding
The pollutants such as paint, iron rust, paint are disposed, and check node population size and weld bond assembly clearance；When welding point has humidity,
Using oxyacetylene torch by the moisture within the scope of the 100mm of groove both sides between play movement thoroughly dry just it is solderable, and will
It plays 100mm ranges at weldering and preheats >=50 degree, placing iodine-tungsten lamp in the position apart from weld bond 1m or so is irradiated, and prevents from welding
Moisture accumulation is in groove region in journey；
（2）Specification is welded referring to table 1 in each position of steel feed bin cylinder.
Each position plate thickness of 1 steel feed bin cylinder of table, material and seam arrangements
| Serial number | Title | Thickness（mm） | Material | Seam arrangements |
| 1 | Top plate | 6 | Q235B | Overlap joint |
| 2 | Ring beam upper shell | 14 | Q235B | Docking |
| 4 | Ring beam | 22 | Q235B | Docking |
| 5 | Ring beam lower shell | 12/14 | Q235B | Docking |
| 6 | Bullet | 14 | Q235B | Docking |
（3）Each position weld seam processing of steel feed bin cylinder is referring to table 2.
Each position weld seam processing of 2 steel feed bin cylinder of table and equipment
| Serial number | Position | Welding method | Equipment | Remarks |
| 1 | Weld seam δ ＜ 6mm | Manual electric arc welding | BX-400 | One layer is welded after back chipping |
| 2 | Circumferential weld δ >=6mm | Manual electric arc welding | BX-400 | One layer of twice are welded after back chipping |
| 3 | Longitudinal joint δ >=6mm | Manual electric arc welding | BX-400 | One layer of twice are welded after back chipping |
| 4 | Other position welding | Manual electric arc welding | BX-400 | Liner plate, connecting plate and support construction |
（4）Each position welding condition of steel feed bin cylinder is referring to table 3.
3 each position welding condition of steel feed bin cylinder of table
（5）Welding procedure
Fig. 9 is the welding sequence and direction schematic diagram of two weld seams of the steel feed bin of the embodiment of the present invention, 1-2-3-4 in figure
Indicate the sequence of welding priority, → indicate welding direction；Arrow indicates backstep welding direction in the 1st weld seam 12, in the 2nd weld seam
Arrow indicates total welding direction in 13.
The longitudinal seam of steel feed bin cylinder is first welded, then weld-ring weld seam.Girth joint uses symmetrical chiasma welding method, point
8 people weld simultaneously at 4 groups, every group of 2 people, using therefrom dividing outside skip welding method, skip welding length 500mm；Every section of weld seam carries out
Number, content includes component number, weld seam number, welding method, welder's name, date etc., accomplishes there is trackability.Welding is completed to answer
Carry out visual examination of weld and UT nondestructive inspections.It was found that defect is rectified and improved in time, while finding out the reason of generating defect, take
Prevent the generation again of defect for measure.
The present invention has substantive distinguishing features and significant technological progress, steel feed bin assembly welding under high humidity environment of the invention
Method takes the management means of reasonable effective measures and science, to ensure steel feed bin engineering construction quality under high humidity environment,
Progress is increased with few cost, overcomes the crucial problem of steel feed bin engineering construction under high humidity environment, achieve good effect
Fruit.In the work progress that more South Platform moulds sintering engineering steel feed bin, steel feed bin assembling and welding method under high humidity environment of the invention
Make 180 day duration of construction plan, by being managed with new technical measures and implementation, science organization, the actually active construction period
150 days, shorten 30 days construction periods, the time at scene is detained so as to shorten 250t crawler cranes, saves 600,000 yuan of machinery expenses, section
About artificial 900 work days, 270,000 yuan of labour cost.The above expense is 870,000 yuan total.
Above example is used for illustrative purposes only rather than limitation of the present invention, the technology people in relation to technical field
Member, without departing from the spirit and scope of the present invention, can also make various transformation or variation.Therefore, all equivalent
Technical solution should also belong to scope of the invention, should be limited by each claim.
Claims (3)
1. steel feed bin assembling and welding method under a kind of high humidity environment, it is characterised in that comprise the following steps that：
A, the flashing, wind proofing canopy of welding is set
The flashing, wind proofing canopy of welding is set, measures air humidity in flashing, wind proofing canopy at any time with hygronom, relative humidity is more than
It is irradiated using more iodine-tungsten lamps when 90%；
B, the control of welding material, includes the following steps：
（1）Welding rod to be dried as required using preceding, heat-preservation cylinder is held and gets welding rod, covers heat preservation cover, welding rod is on-demand,
Forbid to dissipate on the spot；
（2）CO2Gas cylinder should be placed in 0 DEG C of environment above, should be inverted in advance before use, open valve and water is drained use；
（3）The hydrogen controlled electrode for selecting impact flexibility good, the phosphorus content of welding rod<0.12%；Sulphur phosphorus content controls below 0.03%；
CO2Gas purity is not less than 99.9% volume ratio；Water content must not exceed 0.005% mass ratio；
（4）Welding material should set special messenger and be responsible for keeping, nonvoluntary to dismantle electrode packaging, accomplish it is current now tear open, will be remaining after being soldered
Welding rod seal；Every welder matches a heat-preservation cylinder, and welding rod is placed in heat-preservation cylinder；
C, steel feed bin assembles, by ring beam and lower part circular cylinder body group at the IIth section, ring beam upper circular cylinder section group is at I
Section, while by tapered bucket group at the IIIth section, top plate being finally spliced into full wafer, is included the following steps：
（1）It is drawn and is justified with 8200mm diameters on assembly platform, then position with 45 ° of 8 sections of average marks and on platform circle,
45 ° of anchor points weld 8 root posts on the inside of the steel feed bin cylinder that will be assembled, and block is welded between cylinder and column, and column uses
HW300*200 shaped steel, height 3500mm, using No. 16 channel steel bearing diagonal vertical columns, block uses 20mm steel plates, then vertical
1 3t jack is respectively hung on column；
（2）Steel feed bin cylinder cross joint is fixed using fixture when assembling, after one section is completed, checks that cylinder is justified using instrument
The deviation data of degree, perimeter, verticality, concentricity after passed examination, stands every that spot welding is fixed respectively to weld seam；Then make
With cylinder is enclosed under 20t crane lifting cylinders, every section of cylinder docking is fixed using fixture, and there are certain welded gaps, two sections of cylinders
Body longitudinal seam is at least staggered 400mm；Finally as requested to the barrel soldering after assembling；
D, steel feed bin barrel soldering, includes the following steps：
（1）Make groove processing before steel feed bin barrel soldering, is polluted paint, iron rust existing for groove region, paint with abrasive machine
Object is disposed, and checks node population size and weld bond assembly clearance；When welding point humidity, using oxyacetylene torch by groove
Moisture within the scope of the 100mm of both sides between play movement thoroughly dry just it is solderable, and will rise weldering at 100mm ranges preheating >=
It 50 DEG C, places iodine-tungsten lamp in the position apart from weld bond 1m or so and is irradiated, prevent in welding process moisture accumulation in groove area
Domain；
（2）Weld specification in each position of steel feed bin cylinder：
1）Top plate：Thickness 6mm, material Q235B, seam arrangements are overlap joint；
2）Ring beam upper shell：Thickness 14mm, material Q235B, seam arrangements are docking；
3）Ring beam：Thickness 22mm, material Q235B, seam arrangements are docking；
（3）Each position weld seam processing of steel feed bin cylinder：
1）As the horizontal throat depth ＜ 6mm of steel feed bin cylinder, manual electric arc welding welds one layer after back chipping；
2）As steel feed bin cylinder longitudinal seam thickness >=6mm, manual electric arc welding welds one layer of twice after back chipping；
（4）Each position welding condition of steel feed bin cylinder：
1）Bottom includes horizontal welding position, upright welding position, transverse weld position；Welding method arc welding by hand, is filled out
It fills metal J422, fills metal diameter 3.2mm, 105~165A of welding current, 20~22V of arc voltage, speed of welding 5~
8cm/min；
2）The second layer includes horizontal welding position, upright welding position, transverse weld position；Welding method arc welding by hand,
Filling metal J422, filling metal diameter 4mm, 160~180A of welding current, 24~26V of arc voltage, speed of welding 12~
16cm/min；
（5）Welding procedure
Longitudinal seam is first welded, then weld-ring weld seam；Girth joint uses symmetrical chiasma welding method, 8 people to be divided into 4 groups while welding
It connects, every group of 2 people, using being separated from the middle outside skip welding method, skip welding length 500mm；Login is numbered in every section of weld seam,
Content includes component number, weld seam number, welding method, welder's name, date, accomplishes there is trackability；Welding is completed to be welded
Stitch visual examination and ultrasonic flaw detection；It was found that defect is rectified and improved in time, while finding out the reason of generating defect, prevent again
Secondary generation.
2. steel feed bin assembling and welding method under high humidity environment as described in claim 1, which is characterized in that the flashing, wind proofing canopy
Shelf is set up with steel pipe or angle steel, and ceiling installs color steel, the plug-in windproof, fire prevention of surrounding, waterproof cloth, and bottom plate is mated formation heat-insulating flame-retardant
Material.
3. steel feed bin assembling and welding method under high humidity environment as described in claim 1, which is characterized in that the fixture is wedge
Block, U-shaped block and strength cushion block are composed.
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| CN201510048343.XA CN105983759B (en) | 2015-01-30 | 2015-01-30 | Steel feed bin assembling and welding method under high humidity environment |
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|---|---|---|---|
| CN201510048343.XA CN105983759B (en) | 2015-01-30 | 2015-01-30 | Steel feed bin assembling and welding method under high humidity environment |
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| CN105983759B true CN105983759B (en) | 2018-10-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108526740A (en) * | 2018-03-13 | 2018-09-14 | 江苏恒久钢构有限公司 | A kind of base material low-temperature welding technique |
| CN108620759B (en) * | 2018-06-22 | 2020-12-25 | 北京建工四建工程建设有限公司 | Welding process of high-strength steel in rainy and high-humidity environment |
| CN112122739A (en) * | 2020-09-17 | 2020-12-25 | 沃得精机(中国)有限公司 | Tailor welding method for upright column of pressure machine tool |
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| CN103669222A (en) * | 2013-12-24 | 2014-03-26 | 中铁十九局集团第三工程有限公司 | Combined sunshade rainproof canopy of prefabricated box girder |
| CN103920967A (en) * | 2014-02-24 | 2014-07-16 | 中国化学工程第十四建设有限公司 | Absorption tower welding method |
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|---|---|---|---|---|
| JPS60119866A (en) * | 1983-11-30 | 1985-06-27 | 清水建設株式会社 | Assembling of silo cylinder body |
| WO2000001907A1 (en) * | 1998-07-02 | 2000-01-13 | Chicago Bridge And Iron Company | Scaffoldless tank erection method |
| CN1544843A (en) * | 2003-11-17 | 2004-11-10 | 吕建群 | Manufacturing method of low-temperature liquid storage tank |
| CN101856783A (en) * | 2010-07-13 | 2010-10-13 | 中国化学工程第四建设公司 | Integral manufacturing and mounting method of large aluminum alloy stock bin |
| CN103669222A (en) * | 2013-12-24 | 2014-03-26 | 中铁十九局集团第三工程有限公司 | Combined sunshade rainproof canopy of prefabricated box girder |
| CN103920967A (en) * | 2014-02-24 | 2014-07-16 | 中国化学工程第十四建设有限公司 | Absorption tower welding method |
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|---|---|
| CN105983759A (en) | 2016-10-05 |
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