CN109175617A - A kind of high steam pipeline welding method - Google Patents
A kind of high steam pipeline welding method Download PDFInfo
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- CN109175617A CN109175617A CN201811213397.7A CN201811213397A CN109175617A CN 109175617 A CN109175617 A CN 109175617A CN 201811213397 A CN201811213397 A CN 201811213397A CN 109175617 A CN109175617 A CN 109175617A
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- 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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- 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
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Abstract
The present invention relates to a kind of high steam pipeline welding methods, by the retaining wall on slope to high steam pipeline connector at contiguous segmentation formula groove type, hand tungsten argon arc welding bottoming is used after pipe string, twice of manual electric arc welding filling and multiple tracks multilayer manual electric arc welding filling, then manual electric arc welding capping is used, post weld heat treatment finally is carried out to high steam pipeline and postwelding is examined, the transformation of metallographic structure can effectively be promoted by the setting to welding progress welding parameter and heat treatment process to high-pressure steam pipe, growing up for crystal grain is obviously reduced, effectively avoid the generation of weld crack, relative to traditional-handwork arc welding, the welding quality of high steam pipeline and the comprehensive performance of welding region can be significantly improved.
Description
Technical field
The present invention relates to a kind of method for welding pipeline, in particular to a kind of high steam pipeline welding method.
Background technique
Chemically ingredient is seen, the high-pressure steam pipe typically now used has preferable resistance to height for single phase austenite tissue
Mild corrosion resistance, biggish carbon content reflect that this pipeline has biggish tendency of hardenability in welding；And such pipe
The bore in road is big, and thickness of pipe wall, structural rigidity is big, and when welding is easy to produce biggish constraint stress and triaxiality；Simultaneously as
Tube wall is very thick, and retaining wall on slope depth is deep, and cooling velocity is fast when welding, and the diffusible hydrogen in weld seam can not escape in time at this time, just
Meeting is so that the diffusible hydrogen content in weld seam is high；To sum up, such super thick pipeline welding when, hardened structure, diffusible hydrogen and
Under the action of welding stress, it is very easy to generate cold crack.
Since such super thick pipeline solderability is poor, welding point is mainly led to the problem of first is that postwelding can not be modulated
Heat treatment guarantees the intensity of connector, second is that thermal weld stress may cause the toughness decline of material, the improper easy production of technological measure
Raw and cold crackle；Third is that the deposited metal that the high bring remanent magnetism of amount containing Cr causes the arc blow of welding process easy to form lacks
It owes；It selects to use and organizes the filling metal as weld seam similar in base material tissue, reduce base material because solderability difference may produce
The risk of raw and cold crack defect, to simplify the complexity of On-site Welding Technology measure, but due to the high-melting-point of welding rod,
Welding pool surface tension is big, poor fluidity, while the low characteristic of base material is required again as far as possible using low current, therefore increases
The difficulty of welding operation, the key for studying welding procedure is optimal welding parameter and side under the conditions of finding different welding positions
Formula, to obtain consistent heat input.
Summary of the invention
A kind of high steam pipeline welding method proposed the purpose of the present invention is to solve background technique, can not only
Enough transformations for effectively promoting metallographic structure, hence it is evident that reduce growing up for crystal grain, the generation of weld crack is effectively avoided, relative to tradition
Manual electric arc welding can significantly improve the welding quality of high steam pipeline and the comprehensive performance of welding region, have wide
Application prospect.
To achieve the goals above, present invention employs following technical solutions:
A kind of high steam pipeline welding method, which is characterized in that in turn include the following steps:
(1) prepare before welding: welding rod is using preceding carry out drying and processing, and the welding rod after drying should be maintained at 100~150 DEG C of perseverance
In incubator, welding rod should be stored after going out insulating box in electrode dryer, and be finished in 4h, if being not used in 4 hours, welding rod must
Drying must be re-started, and repeats drying no more than 2 times；
(2) finished edge: processing groove using machining mode, and using contiguous segmentation formula groove, root face is not
Greater than 1.5mm, groove bottom and pipe lengths angle are 60 °, height 10mm, groove top and pipe lengths angle
It is 75 °；
(3) pipe string: the group of group clock synchronization setting guarantees spacer shims alignment clearance, and gap is preferably greater than the diameter of welding wire, i.e.,
2.8~3mm, pipe or pipe fitting group clock synchronization, inner wall should flush, inner wall unfitness of butt joint no more than pipe thickness 10% and should be big
In 0.5mm, when the inner wall difference of pipeline is more than 0.5mm or outer wall difference is more than 2mm, deburring is answered to guarantee welding quality；
(4) hand tungsten argon arc welding bottoming: preheating pipeline welding position using Electric heating, and pipeline both ends are effective
It blocks, is preheated to 150 DEG C for the first time, heating rate is 75 DEG C/h, and heat preservation 15min uses multilayer again after weldment reaches preheating temperature
Single-run welding mode carries out hand tungsten argon arc welding bottoming, guarantees that temperature is uniform on thickness direction, and one-time continuous is soldered, and is welded
Preheating is tracked in journey, for heat range on the basis of welding point center line, two sides are not less than 100mm, the 100mm other than heating zone
Region carries out isothermal holding；
(5) manual electric arc welding is filled: being carried out subsequent preheating after bottoming, is preheated to 250-350 DEG C for the second time, heating rate 75
DEG C/h, twice of manual electric arc welding filling and multiple tracks multilayer manual electric arc welding filling are carried out, tracks preheating in welding process, in advance
For heat rating on the basis of welding point center line, two sides are not less than 100mm, and the region 100mm other than heating zone carries out at heat preservation
Reason；
(6) it manual electric arc welding capping: keeps preheating temperature at 350 DEG C after the completion of filling, lid is filled using manual electric arc welding
Face；
(7) post weld heat treatment: being welded dirty blocking pipe both ends port, heated using local electrical heating method, heated perimeter with
On the basis of Weld pipe mill, two sides are respectively not less than 3 times of weld width and are not less than 25mm, answer within the scope of the 100mm outside heating zone
Heat preservation is given, selects the heating rate of 75 DEG C/h to be warming up to 720~750 DEG C, cooling processing, cooling rate 75 is carried out after constant temperature 3h
DEG C/h, temperature carries out natural cooling at 300 DEG C；
(8) postwelding is examined: pipeline wall thickness is finished greater than the weld seam of 40mm in bottoming and the throat depth filled to about 20mm is laggard
Residual thickness is soldered by row ray detection after qualified, and carries out 100% ultrasound examination；Visual examination, non-destructive testing are not conformed to
The weld seam of lattice should be reprocessed, and the weld seam after reprocessing is tested by former detection method.
It is limited as of the invention further, the quench-hardened case in groove face and edge 20mm is ground by when finished edge
Completely, paint, burr, rust staining, oxide skin are removed, is detected after processing, groove face must not have crackle, interlayer it is scarce
It falls into, and magnetic detection and permeability detection is carried out to the groove of base material, grinding process is carried out to pipeline inside cutting end face, is formed
The smooth transition of groove end face.
As further restriction of the invention, hand tungsten argon arc welding technological parameter are as follows: argon arc welding nozzle diameter 12mm,
Tungsten electrode extension elongation 5-6mm, argon arc welding nozzle with 75 °~80 ° of weldment angle, with purity be 99.99% argon gas carry out protection weldering
It connects, front protecting 12~18L/min of gas flow, 10~12L/min of backing gas flow；Power supply straight polarity direct current, electric current
105~125A, 10~12V of arc voltage, 6~9cm/min of speed of welding, heat input are not more than 15KJ/cm.
As further restriction of the invention, twice of shielded metal arc welding process parameter is respectively as follows: first pass manual arc
Weldering filling use diameter 3.2mm R407 welding wire, with purity be 99.99% and water content lower than 0.05 ‰ carbon dioxide gas into
Row protection welding, backing gas 10~12L/min of flow, power supply DC reverse connection, 95~115A of electric current, arc voltage 21~
24V, 7~11cm/min of speed of welding, heat input are not more than 24KJ/cm；Second time manual electric arc welding filling uses diameter 3.2mm
R407 welding wire, with purity be 99.99% and water content lower than 0.05 ‰ carbon dioxide gas carries out protection welding, back-protective
10~12L/min of gas flow, power supply DC reverse connection, 100~120A of electric current, 21~24V of arc voltage, speed of welding 7~
11cm/min, heat input are not more than 25KJ/cm.
As further restriction of the invention, multiple tracks multilayer shielded metal arc welding process parameter are as follows: using diameter 4.0mm's
R407 welding wire, power supply DC reverse connection, 140~165A of electric current, 21~24V of arc voltage, 10~13cm/min of speed of welding, line energy
Amount is not more than 24KJ/cm.
As further restriction of the invention, manual electric arc welding capping technological parameter are as follows: using the R407 of diameter 4.0mm
Welding wire, power supply DC reverse connection, 140~160A of electric current, 21~24V of arc voltage, 10~14cm/min of speed of welding, heat input is not
Greater than 23KJ/cm.
As the further restriction of the present invention, because special circumstances are interrupted or whole weld seam after the completion cannot in welding process
It when being heat-treated immediately, is heat-treated after should carrying out, rear heat treatment temperature control is between 300 DEG C~350 DEG C, soaking time
2h, heating rate are not more than 75 DEG C/h.
As further restriction of the invention, interlayer temperature is detected at any time in welding process, strict control layer
Between temperature at 250~300 DEG C of preheating temperature, re-started when not reaching requirement preheating after can continue to weld；In welding process
Heating facility is not removed, and isothermal holding is carried out.
The beneficial effects of the present invention are:
1, the heat resisting steel as used in high-pressure steam pipe has larger tendency of hardenability and crackle tendency, in order to reduce hardened structure and
Reduce welding stress, reduce the temperature difference of cooling velocity and welding section, using welding the pre-heat treatment, is conducive to diffusible hydrogen in weld seam
Evolution, prevents the welding defects such as welding cold cracking.
2, using the technology detected at any time to interlayer temperature in the welding process, strict control interlayer temperature is being preheated
250 DEG C~300 DEG C of temperature, continue welding after preheating is re-started when not reaching requirement, for the weldering using electrical heating method preheating
Seam, heating facility is not removed during welding, is kept the temperature, first is that making weldment whole cross section heat penetration, i.e., inside and outside temperature is uniform；Two
It is to guarantee that structural transformation is complete.
3, it after weldment reaches preheating temperature, keeps starting bottom welding again in 15 minutes and one-time continuous is soldered, Neng Goubao
Temperature is uniform in a thickness direction for card；After bottom welding is complete, next layer of welding is carried out immediately and is continuously soldered, can guarantee to weld
Connecing interlayer temperature prevents the generation of weld crack.
4, it must be interrupted in welding process, whole road weld seam is completed to be heat-treated after taking when cannot be heat-treated immediately, postheat temperature
300~350 DEG C, constant temperature 2h are heated to, heating rate is that can eliminate the diffusible hydrogen in weld seam in this way no more than 75 DEG C/h, is prevented
Only generate cold crack.
5, post weld heat treatment is carried out to the connector after welding, the heating rate of 75 DEG C/h is selected to be warming up to 720~750 DEG C,
Cooling processing is carried out after constant temperature 3h, cooling rate is 75 DEG C/h, and temperature carries out natural cooling, such processing side at 300 DEG C
Formula can eliminate the residual stress of welding point, reduce hardenability, improve tissue, accelerate the evolution of hydrogen, prevent welding and split
Line improves the comprehensive mechanical property of connector.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that weld bond groove is docked in high steam pipeline welding method proposed by the present invention.
Fig. 2 is the welding point metallographic structure figure of high steam pipeline welding method proposed by the present invention.
Specific embodiment
It is next combined with specific embodiments below that the present invention is further described.
Embodiment one
Referring to Fig.1, a kind of high steam pipeline welding method, which is characterized in that in turn include the following steps: (1) quasi- before welding
Standby: welding rod is using preceding carry out drying and processing, and the welding rod after drying should be maintained in 100~150 DEG C of insulating box, and welding rod goes out perseverance
It should store in electrode dryer after incubator, and be finished in 4h, if being not used in 4 hours, welding rod must re-start drying
And drying is repeated no more than 2 times；
(2) finished edge: processing groove using machining mode, and using contiguous segmentation formula groove, root face is not
Greater than 1.5mm, groove bottom and pipe lengths angle are 60 °, height 10mm, groove top and pipe lengths angle
It is 75 °；
(3) pipe string: the group of group clock synchronization setting guarantees spacer shims alignment clearance, and gap is preferably greater than the diameter of welding wire, i.e.,
2.8~3mm, pipe or pipe fitting group clock synchronization, inner wall should flush, inner wall unfitness of butt joint no more than pipe thickness 10% and should be big
In 0.5mm, when the inner wall difference of pipeline is more than 0.5mm or outer wall difference is more than 2mm, deburring is answered to guarantee welding quality；
(4) hand tungsten argon arc welding bottoming: preheating pipeline welding position using Electric heating, and pipeline both ends are effective
It blocks, is preheated to 150 DEG C for the first time, heating rate is 75 DEG C/h, and heat preservation 15min uses multilayer again after weldment reaches preheating temperature
Single-run welding mode carries out hand tungsten argon arc welding bottoming, guarantees that temperature is uniform on thickness direction, and one-time continuous is soldered, and is welded
Preheating is tracked in journey, for heat range on the basis of welding point center line, two sides are not less than 100mm, the 100mm other than heating zone
Region carries out isothermal holding；
(5) manual electric arc welding is filled: being carried out subsequent preheating after bottoming, is preheated to 250-350 DEG C for the second time, heating rate 75
DEG C/h, twice of manual electric arc welding filling and multiple tracks multilayer manual electric arc welding filling are carried out, tracks preheating in welding process, in advance
For heat rating on the basis of welding point center line, two sides are not less than 100mm, and the region 100mm other than heating zone carries out at heat preservation
Reason；
(6) it manual electric arc welding capping: keeps preheating temperature at 350 DEG C after the completion of filling, lid is filled using manual electric arc welding
Face；
(7) post weld heat treatment: being welded dirty blocking pipe both ends port, heated using local electrical heating method, heated perimeter with
On the basis of Weld pipe mill, two sides are respectively not less than 3 times of weld width and are not less than 25mm, answer within the scope of the 100mm outside heating zone
Heat preservation is given, selects the heating rate of 75 DEG C/h to be warming up to 720~750 DEG C, cooling processing, cooling rate 75 is carried out after constant temperature 3h
DEG C/h, temperature carries out natural cooling at 300 DEG C；
(8) postwelding is examined: pipeline wall thickness is finished greater than the weld seam of 40mm in bottoming and the throat depth filled to about 20mm is laggard
Residual thickness is soldered by row ray detection after qualified, and carries out 100% ultrasound examination；Visual examination, non-destructive testing are not conformed to
The weld seam of lattice should be reprocessed, and the weld seam after reprocessing is tested by former detection method.
Wherein, the quench-hardened case in groove face and edge 20mm is ground when finished edge it is clean, remove paint, burr,
Rust staining, oxide skin are detected after processing, and groove face must not have the defect of crackle, interlayer, and carry out to the groove of base material
Magnetic detection and permeability detection carry out grinding process to pipeline inside cutting end face, form the smooth transition of groove end face.
Wherein, hand tungsten argon arc welding technological parameter are as follows: argon arc welding nozzle diameter 12mm, tungsten electrode extension elongation 5-6mm, argon
Arc-welding nozzle with 75 °~80 ° of weldment angle, with purity be 99.99% argon gas carry out protection welding, front protecting gas flow
12~18L/min, 10~12L/min of backing gas flow；Power supply straight polarity direct current, 105~125A of electric current, arc voltage 10
~12V, 6~9cm/min of speed of welding, heat input are not more than 15KJ/cm.
Wherein, twice of shielded metal arc welding process parameter is respectively as follows: first pass manual electric arc welding filling using diameter 3.2mm's
R407 welding wire, with purity be 99.99% and carbon dioxide gas of the water content lower than 0.05 ‰ carries out protection welding, back-protective gas
Body 10~12L/min of flow, power supply DC reverse connection, 95~115A of electric current, 21~24V of arc voltage, 7~11cm/ of speed of welding
Min, heat input are not more than 24KJ/cm；Second time manual electric arc welding filling uses the R407 welding wire of diameter 3.2mm, is with purity
99.99% and carbon dioxide gas of the water content lower than 0.05 ‰ carry out protection welding, backing gas 10~12L/min of flow,
Power supply DC reverse connection, 100~120A of electric current, 21~24V of arc voltage, 7~11cm/min of speed of welding, heat input are not more than
25KJ/cm。
Wherein, multiple tracks multilayer shielded metal arc welding process parameter are as follows: using the R407 welding wire of diameter 4.0mm, power supply direct current is anti-
It connects, 140~165A of electric current, 21~24V of arc voltage, 10~13cm/min of speed of welding, heat input is not more than 24KJ/cm.
Wherein, manual electric arc welding capping technological parameter are as follows: using the R407 welding wire of diameter 4.0mm, power supply DC reverse connection, electricity
140~160A, 21~24V of arc voltage, 10~14cm/min of speed of welding are flowed, heat input is not more than 23KJ/cm.
Notice that the following aspects can prevent the generation of all kinds of defects when formulating welding procedure:
A. must not the striking other than groove, weldment group clock synchronization, which should pad, sets securely, and should take measures to prevent welding and heat treatment mistake
Additional stress and deformation are generated in journey, must not be organized by force pair；
B. to the welding of high steam pipeline, preheating temperature is 250~350 DEG C；
C. the welding of high steam pipeline carries out protection welding, front protecting gas flow 12 with the argon gas that purity is 99.99%
~18L/min, 10~12L/min of backing gas flow；
D. in the welding process, pipeline both ends are effectively blocked, prevents " draught "；Ventilation will cause air turbulence, influence argon
Gas shielded effect, it will argon gas is taken away, it is easy to cause root stomata, and be not easy to find；
E. thickness in monolayer adds 2mm no more than core diameter used；Single pass welding swing width is not more than 5 times of core diameter used；
F. welding bead arrangement uses multi-pass welding, and to reducing, weld heat input, reduction welding stress is horizontal, prevents bad gold
Belong to tissue, control welding deformation plays a significant role；
When g. welding sublevel welding bead, prime coat will not be burnt.It is according to the test of inventor, the minimum of bottom argon arc welding layer is thick
Metric is set to 3mm, guarantees the fundamental strength of weld seam, prevents from cracking；
H. it is ensured that the quality of the starting the arc and receipts arc, should fill up arc crater when receiving arc, the interlayer connector of multilayer welding answers phase in welding
Mutually it is staggered；
I. every layer of multilayer welding be soldered after, should interlayer be cleared up and be checked immediately.The interlayer scarfing cinder time is not more than 15 minutes, and
Interlayer temperature is not lower than preheating temperature；
J. every weld seam answers one-time continuous to be soldered, and must such as interrupt, by heat request after normal when stopping weldering, after confirmation flawless can after
Continue welding by original process requirement.
Wherein, it when in welding process because that cannot be heat-treated immediately after the completion of special circumstances are interrupted or whole weld seam, answers
It is heat-treated after progress, between 300 DEG C~350 DEG C, soaking time 2h, heating rate is not more than 75 for rear heat treatment temperature control
℃/h。
Wherein, interlayer temperature is detected at any time in welding process, strict control interlayer temperature preheating temperature 250~
It 300 DEG C, can continue to weld after preheating is re-started when not reaching requirement；Heating facility is not removed in welding process, is protected
Temperature processing.
Pipe string requirement:
A. it is less than the weld seam of 200mm for caliber, 3~4 points of selection are recommended in tack welding position；Group should be less than unfitness of butt joint
The 10% of wall thickness, quality control level are that I grades of pipeline should not exceed 1mm, and the pipeline of other ranks is no more than 2mm；
B. the welding requirements of tack welding and pipe clamp tool is identical as formal welding procedure, and tack welding length, thickness and spacing should be able to protect
Card weld seam will not crack in formal welding process；Generally 10~15mm is highly 2~4mm, and is no more than the three of thickness of pipe wall
/ bis-, weldering meat should not have the defects of crackle, and gentle slope is worn into tack welding weldering meat two sides with sanding machine before welding first layer
Shape, so that joint is sufficiently merged；
C. and base material welding pipe clamp have its material should or same class alias identical as base material；It need to be pre-stretched or precompressed pipeline
Weld seam, organizing the tool of work card used in clock synchronization should finish in the welding of entire weld seam and heat treatment and can be removed after the assay was approved；
Base material should not be damaged when dismounting, residual crator polishing should be trimmed to and base material flush after dismounting.
D. the group to point stereoplasm amount of nozzle is through after the assay was approved, can formally be welded.
The control of preheating, interlayer temperature and welding parameter should be noted main points:
Since the characteristic of high steam pipeline used is obtained by the martensitic structure in pipeline material, welding process should be taken
Measure guarantees that joint metal group is woven in continuous cooling process and can be completely reformed into martensitic structure, excessively high preheating temperature, layer
Between temperature and excessive thermal weld stress be to cause to be formed in heat affected area and weld seam；It is excessively high there are due to ferritic
Preheating and interlayer temperature are not only not necessarily to prevention and treatment cold crack, can jeopardize the toughness of weld metal on the contrary, therefore constructing
Journey takes following measures to control Thermal Cycle: a. preheating, interlayer temperature control measure, temperature measuring point is adding when connector weld preheating
The torrid zone is lower and has the distance of 80mm or so apart from groove, and temperature measuring point temperature not can accurately reflect in the preceding groove of weldering and need on welding bead in weldering
The temperature in control area is wanted, temperature measuring point reflection temperature is not reached, for interlayer for actual temperature in preheating temperature groove
It is more than temperature measuring point temperature that temperature, which controls actual temperature, it is therefore necessary to the real-time temperature of actual measurement welding region is assisted using temperature-measuring gun,
Control preheating temperature starts welding (bottom argon arc welding control is not less than 180 DEG C) not less than 230 DEG C, it is specified that welder is in welding institute
Confirmation interlayer temperature should be surveyed after having before one of weld seam, control interlayer temperature is welded between 230-280 DEG C, it is excessively high it is too low be all not
Conducive to the cold crack control and toughness control of connector；
B. achieving the purpose that control heat input by limiting a weld bead width and thickness, wlding alloying element content is higher,
Molten bath molten iron flow is poor, can bring the visual defects of lack of fusion between layer road using low current for control heat input, therefore needs
Lower thermal weld stress amount is guaranteed by improving weldering speed using biggish welding current；Strict control single-run welding pipeline in one step is molten
3 times that thickness is not more than core diameter no more than core diameter, weld width are applied, due speed of welding is ensure that, realizes
The purpose of appropriate heat input control heat input；
C. due to the complete transition temperature of the martensite of tubing used at 300 DEG C hereinafter, postwelding should ensure that connector be cooled to 300 DEG C with
Lower can just reheat is heat-treated, but is to prevent postwelding rapid cooling cold cracking inclination serious, should take heat preservation slow cooling measure,
For the connector that postwelding cannot be heat-treated in time, postwelding should be immediately heated 250-300 DEG C of heat preservation no less than 1 hour and carry out
Dehydrogenation；The weld bond that the same day cannot be continuously finished should ensure that filling throat depth is no less than 1/3 wall thickness, and should continue heat preservation not
Less than 150 DEG C until starting to weld for the second time；
D. gas-filled protective measure, the back side when high alloy content of wlding used increases bottom argon arc welding are protected in argon arc bottoming back
Oxidation tendency, using the preset close measure more to standardize, weld bond group to it is preceding respectively in the nozzle of both ends it is preset securely
Cardboard, group form sealed air chamber to high temperature adhesive plaster or ore in sand form face plugging gap is used after preset clearance, using porous thin when welding
Copper pipe is inserted into from gap increases gas pushing quantity, gradually tears adhesive plaster or ore in sand form face with molten bath movement, reduces the leakage rate of argon gas, improve
Gas-filled protective effect in managing, protects back metal, prevents excessive oxidation, lack of penetration and incomplete fusion caused by overcoming because of weld seam oxidation
The defects of, and preset cardboard is burnt in heat treatment, and solids will not be left in pipeline.
Stretching, bending, impact and hardness test
Welded Joints are stretched, are bent, impacted and hardness test, shown in test result the following table 1 to 4:
1 welding point bend test result of table
| Test number | Sample thickness (mm) | Bending angle | It is bent shaft diameter (mm) | Bend mode | Defect type |
| 1 | 10 | 180° | 40 | Lateral bending | Zero defect |
| 2 | 10 | 180° | 40 | Lateral bending | Zero defect |
| 3 | 10 | 180° | 40 | Lateral bending | Zero defect |
| 4 | 10 | 180° | 40 | Lateral bending | Zero defect |
| 5 | 10 | 180° | 40 | Lateral bending | Zero defect |
2 welding point stretch test result of table
| Test number | Specimen width (mm) | Sample thickness (mm) | Cross-sectional area mm2 | Maximum load KN | Tensile strength MPa | Fracture location and breaking property |
| 1 | 20.12 | 34.42 | 708 | 405.3 | 577 | Heat affected area ductile rupture |
| 2 | 19.87 | 35.02 | 783 | 387.9 | 572 | Heat affected area ductile rupture |
3 welding point Impulse Test Result of table
4 welding point hardness test result of table
| Test number | Weld metal zone | Heat affected area | Base material area |
| 1 | 199 | 143 | 133 |
| 2 | 201 | 145 | 128 |
| 3 | 198 | 147 | 143 |
| 4 | 202 | 148 | 139 |
| 5 | 197 | 144 | 136 |
Finally, as seen from Figure 2, the fusion of connector is all right, welding point metallographic structure base material area is ferrite, weld seam
Tissue is that tempered sorbite adds a small amount of ferrite, and heat affected area is that ferrite adds pearlite to add a small amount of tempering bainite；Thus it says
Bright thermal weld stress sees welding rod thermal weld stress butt joint deposited metal, the tissue morphology of heat affected area influences less.
The present invention by the retaining wall on slope to high steam pipeline connector at contiguous segmentation formula groove type, by pipeline group
To rear using hand tungsten argon arc welding bottoming, twice of manual electric arc welding filling and multiple tracks multilayer manual electric arc welding filling, so
Manual electric arc welding capping is used afterwards, and post weld heat treatment finally is carried out to high steam pipeline and postwelding is examined, by to high pressure
The setting of the welding progress welding parameter and heat treatment process of steam pipe can effectively promote the transformation of metallographic structure, hence it is evident that reduce
Crystal grain is grown up, and the generation of weld crack is effectively avoided, and relative to traditional-handwork arc welding, can significantly improve high-pressure steam pipe
The welding quality in road and the comprehensive performance of welding region.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of high steam pipeline welding method, which is characterized in that in turn include the following steps:
(1) prepare before welding: welding rod is using preceding carry out drying and processing, and the welding rod after drying should be maintained at 100~150 DEG C of perseverance
In incubator, welding rod should be stored after going out insulating box in electrode dryer, and be finished in 4h, if being not used in 4 hours, welding rod must
Drying must be re-started and repeat drying no more than 2 times；
(2) finished edge: processing groove using machining mode, and using contiguous segmentation formula groove, root face is not
Greater than 1.5mm, groove bottom and pipe lengths angle are 60 °, height 10mm, groove top and pipe lengths angle
It is 75 °；
(3) pipe string: the group of group clock synchronization setting guarantees spacer shims alignment clearance, and gap is preferably greater than the diameter of welding wire, i.e.,
2.8~3mm, pipe or pipe fitting group clock synchronization, inner wall should flush, inner wall unfitness of butt joint no more than pipe thickness 10% and should be big
In 0.5mm, when the inner wall difference of pipeline is more than 0.5mm or outer wall difference is more than 2mm, deburring is answered to guarantee welding quality；
(4) hand tungsten argon arc welding bottoming: preheating pipeline welding position using Electric heating, and pipeline both ends are effective
It blocks, is preheated to 150 DEG C for the first time, heating rate is 75 DEG C/h, and heat preservation 15min uses multilayer again after weldment reaches preheating temperature
Single-run welding mode carries out hand tungsten argon arc welding bottoming, guarantees that temperature is uniform on thickness direction, and one-time continuous is soldered, and is welded
Preheating is tracked in journey, for heat range on the basis of welding point center line, two sides are not less than 100mm, the 100mm other than heating zone
Region carries out isothermal holding；
(5) manual electric arc welding is filled: being carried out subsequent preheating after bottoming, is preheated to 250-350 DEG C for the second time, heating rate 75
DEG C/h, twice of manual electric arc welding filling and multiple tracks multilayer manual electric arc welding filling are carried out, tracks preheating in welding process, in advance
For heat rating on the basis of welding point center line, two sides are not less than 100mm, and the region 100mm other than heating zone carries out at heat preservation
Reason；
(6) it manual electric arc welding capping: keeps preheating temperature at 350 DEG C after the completion of filling, lid is filled using manual electric arc welding
Face；
(7) post weld heat treatment: being welded dirty blocking pipe both ends port, heated using local electrical heating method, heated perimeter with
On the basis of Weld pipe mill, two sides are respectively not less than 3 times of weld width and are not less than 25mm, answer within the scope of the 100mm outside heating zone
Heat preservation is given, selects the heating rate of 75 DEG C/h to be warming up to 720~750 DEG C, cooling processing, cooling rate 75 is carried out after constant temperature 3h
DEG C/h, temperature carries out natural cooling at 300 DEG C；
(8) postwelding is examined: pipeline wall thickness is finished greater than the weld seam of 40mm in bottoming and the throat depth filled to about 20mm is laggard
Residual thickness is soldered by row ray detection after qualified, and carries out 100% ultrasound examination；Visual examination, non-destructive testing are not conformed to
The weld seam of lattice should be reprocessed, and the weld seam after reprocessing is tested by former detection method.
2. a kind of high steam pipeline welding method according to claim 1, it is characterised in that: when finished edge, by slope
Quench-hardened case grinding in discharge surface and edge 20mm is clean, removes paint, burr, rust staining, oxide skin, is examined after processing
It surveys, groove face must not have the defect of crackle, interlayer, and carry out magnetic detection and permeability detection to the groove of base material, to pipe
Cutting end face carries out grinding process inside road, forms the smooth transition of groove end face.
3. a kind of high steam pipeline welding method according to claim 1, it is characterised in that: the handwork tungsten electrode argon arc
The technological parameter of welder's bottoming are as follows: argon arc welding nozzle and 75 °~80 ° of weldment angle are protected with the argon gas that purity is 99.99%
Shield welding, front protecting 12~18L/min of gas flow, 10~12L/min of backing gas flow；Power supply straight polarity direct current,
105~125A of electric current, 10~12V of arc voltage, 6~9cm/min of speed of welding, heat input are not more than 15KJ/cm.
4. a kind of high steam pipeline welding method according to claim 3, it is characterised in that: twice of manual arc welder
Skill parameter is respectively as follows: the R407 welding wire that first pass manual electric arc welding filling uses diameter 3.2mm, is 99.99% and aqueous with purity
Carbon dioxide gas of the amount lower than 0.05 ‰ carries out protection welding, backing gas 10~12L/min of flow, and power supply direct current is anti-
It connects, 95~115A of electric current, 21~24V of arc voltage, 7~11cm/min of speed of welding, heat input is not more than 24KJ/cm；Second
The R407 welding wire that diameter 3.2mm is used all over manual electric arc welding filling is 99.99% and two of water content lower than 0.05 ‰ with purity
Carbonoxide gas carries out protection welding, backing gas 10~12L/min of flow, power supply DC reverse connection, 100~120A of electric current,
21~24V of arc voltage, 7~11cm/min of speed of welding, heat input are not more than 25KJ/cm.
5. a kind of high steam pipeline welding method according to claim 4, it is characterised in that: multiple tracks multilayer manual arc
Welding parameter are as follows: using the R407 welding wire of diameter 4.0mm, power supply DC reverse connection, 140~165A of electric current, arc voltage 21~
24V, 10~13cm/min of speed of welding, heat input are not more than 24KJ/cm.
6. a kind of high steam pipeline welding method according to claim 5, it is characterised in that: manual electric arc welding capping work
Skill parameter are as follows: using the R407 welding wire of diameter 4.0mm, power supply DC reverse connection, 140~160A of electric current, 21~24V of arc voltage,
10~14cm/min of speed of welding, heat input are not more than 23KJ/cm.
7. a kind of high steam pipeline welding method according to claim 6, it is characterised in that: because special in welding process
It when situation is interrupted or whole weld seam cannot be heat-treated immediately after the completion, is heat-treated after should carrying out, rear heat treatment temperature control
Between 300 DEG C~350 DEG C, soaking time 2h, heating rate is not more than 75 DEG C/h.
8. a kind of high steam pipeline welding method according to claim 7, it is characterised in that: right at any time in welding process
Interlayer temperature is detected, strict control interlayer temperature between 250~300 DEG C of preheating temperature, when not reaching requirement again into
It can continue to weld after row preheating；Heating facility is not removed in welding process, carries out isothermal holding.
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| CN114406420A (en) * | 2022-03-14 | 2022-04-29 | 广州文冲船厂有限责任公司 | Welding flux leakage-proof device and welding method using same |
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Application publication date: 20190111 |