CN109352134A - A kind of acidic environment carbon steel piping welding method - Google Patents
A kind of acidic environment carbon steel piping welding method Download PDFInfo
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- CN109352134A CN109352134A CN201811422979.6A CN201811422979A CN109352134A CN 109352134 A CN109352134 A CN 109352134A CN 201811422979 A CN201811422979 A CN 201811422979A CN 109352134 A CN109352134 A CN 109352134A
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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
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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
- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3026—Mn as the principal constituent
-
- 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
Abstract
The present invention provides a kind of acidic environment carbon steel piping welding methods.The described method includes: control main pipe chemical component, carries out retaining wall on slope and group pair to main pipe；Main pipe weld bond of the group to after is preheated；Root bead and hot weld are carried out to the weld bond after preheating using I class wlding；Weldering and cosmetic welding are filled using II class wlding butt welding mouth；Post weld heat treatment is carried out after non-destructive testing, completes welding.It is able to solve Weld Performance intensity height, hardness height after acid carbon steel piping welds according to the method for the present invention, causes weld seam easily due to SSC sensitivity the problem of corrosion cracking；Local tensile stress is generated because of stress raisers or residual stress concentrations after being able to solve acid carbon steel piping welding, under the effect of sulfide hydrogen medium the problem of induction sulfide-stress cracking；It is able to solve after the welding of acid carbon steel piping that S, P, O content are higher in seam organization, generates oxide, sulfide etc. and be mingled with the problem of seriously affecting weld seam degree of purity, welding seam toughness is caused to decline.
Description
Technical field
The invention belongs to welding technology fields, more particularly, be related to it is a kind of by control welding material, welding procedure and
Post weld heat treatment, to improve the welding method of carbon steel piping hydrogen sulfide corrosion resistant ability.
Background technique
In petroleum, chemical industry, the process units of sulfide hydrogen medium is handled, carbon steel equipment is mostly used greatly, however, carbon
Steel equipment is easy the corrosion by hydrogen sulfide and is destroyed, and will lead to the case where overhauling of being forced to stop production, very to production
It is unfavorable.All the time, the technical requirements all ununified to the method welded for petroleum gas acidic environment carbon steel piping,
The domestic CROSS REFERENCE that also mature sulfur resistive carbon steel piping does not weld.
Therefore, need it is a kind of from the requirement for meeting acidic environment weld seam corrosion resistance and physicochemical property, by tight
Lattice control the key links such as welding material, welding craft and after-heat treatment, so that carbon steel welding quality obtains under acidic environment
Guarantee, to better meet the exploitation and pipe-line construction requirement of petroleum gas acid gas field, improves pipeline service life, subtract
The welding method of few maintenance, repair cost.
Summary of the invention
Aiming at the problems existing in the prior art, it is an object of the invention to solve in deficiencies of the prior art
At least one of.For example, it is high it is an object of the invention to solve Weld Performance intensity height, hardness after acid carbon steel piping welds,
Cause weld seam easily due to SSC sensitivity the problem of corrosion cracking；It is caused in weld seam because of hydrogen blister after the acid carbon steel piping welding of solution
Weld seam hydrogen embrittlement and the problem of lead to hydrogen induced cracking (HIC)；It solves after acid carbon steel piping welds because of stress raisers or residual stress collection
In and the problem of generate local tensile stress, induce sulfide-stress cracking under the effect of sulfide hydrogen medium；It solves acid
S, P, O content are higher in seam organization after carbon steel piping welding, generate oxide, sulfide etc. and are mingled with that seriously affect weld seam pure
The problem of spending, welding seam toughness caused to decline.
An aspect of of the present present invention provides a kind of acidic environment carbon steel piping welding method, the method may include: control
Main pipe chemical component processed carries out retaining wall on slope and group pair to main pipe；Main pipe weld bond of the group to after is preheated；It is welded using I class
Material carries out root bead to the weld bond after preheating；Hot weld, filling weldering and cosmetic welding are carried out using II class wlding butt welding mouth；After non-destructive testing
Post weld heat treatment is carried out, completes carbon steel piping welding, wherein the chemical component of the main pipe is by mass percentage are as follows: C≤
0.14%, Si≤0.40%,
Mn≤1.35%, P≤0.002%, S≤0.003%, Cu≤0.20%, Ni≤0.30%, Cr≤0.30%, Mo
≤ 0.15%, Al≤0.060%, Ti≤0.04%, B≤0.0005%, Ca≤0.006%, N≤0.012%, remaining is Fe
With inevitable impurity；The deposited metal composition of the I class wlding include: by mass percentage C:0.06%~
0.15%, Mn≤1.35%, Si:0.45%~0.75%, S≤0.008%, P≤0.020%,
Cr≤0.15%, Ni≤0.15%, Cu≤0.50%；The deposited metal composition of the II class wlding presses quality
Percentage meter includes: C≤0.10%, Mn≤1.20%, Si≤0.90%, S≤0.005%, P≤0.012%, and Cr≤
0.20%, Ni≤0.30%, Mo≤0.30%, V≤0.08%.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the I class wlding is bent
Taking intensity is 400MPa~484MPa, and tensile strength is 480MPa~570MPa, and the yield strength of the II class wlding is
330MPa~380MPa, tensile strength are 420MPa~500MPa.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the groove can be
Double V-groove, the root face of the groove can be 0.5mm~1.5mm, and bevel angle can be 60 °~70 °, and root gap can be with
For 2.5mm~3.5mm.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the temperature of the preheating
It can be 100 DEG C~150 DEG C, the width of preheating can be each 90mm~110mm in weld seam two sides.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the root bead can be adopted
With argon arc welding up hill welding, the flow of protective gas can be 10L/min~15L/min.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the hot weld can be adopted
With welding electrode arc welding, weld interpass temperature can be 100 DEG C~200 DEG C.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the root bead with it is described
The weld interval time between hot weld can be no more than 10min；
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, filling weldering can be with
It is connect using welding rod arc up hill welding, weld interpass temperature can be 100 DEG C~200 DEG C.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the cover welding can
To be connect using welding rod arc up hill welding.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the non-destructive testing is opened
Beginning the time can be greater than for 24 hours with the interval for welding the deadline.
In an exemplary embodiment of acidic environment carbon steel piping welding method of the invention, the post weld heat treatment
It may include being warming up to 610~640 DEG C after being warming up to 380 DEG C~430 DEG C with the heating rate no more than 200 DEG C/h, heat preservation
50min~70min is cooled to 380 DEG C~430 DEG C with the cooling rate no more than 260 DEG C/h, is cooled to room temperature.
Compared with prior art, beneficial effects of the present invention include at least one in the following contents: being able to solve acidity
Weld Performance intensity height, hardness are high after carbon steel piping welding, cause weld seam easily due to SSC sensitivity the problem of corrosion cracking；It can
It solves the problem of to lead to hydrogen induced cracking (HIC) because hydrogen blister causes weld seam hydrogen embrittlement in weld seam after acid carbon steel piping welding；It can solve
Local tensile stress is generated because of stress raisers or residual stress concentrations after certainly acid carbon steel piping welding, is situated between in sulfide hydrogen
The problem of inducing sulfide-stress cracking under matter effect；Be able to solve after the welding of acid carbon steel piping S, P in seam organization,
O content is higher, generates oxide, sulfide etc. and is mingled with the problem of seriously affecting weld seam degree of purity, welding seam toughness is caused to decline.
Detailed description of the invention
By the description carried out with reference to the accompanying drawing, above and other purpose of the invention and feature will become more clear
Chu, in which:
Fig. 1 shows the welding point of an exemplary embodiment of acidic environment carbon steel piping welding method of the invention
Design diagram.
Fig. 2 shows the heat treatment works of an exemplary embodiment of acidic environment carbon steel piping welding method of the invention
Skill curve synoptic diagram.
Specific embodiment
Hereinafter, a kind of acidic environment carbon steel piping that the present invention will be described in detail will be carried out in conjunction with exemplary embodiment to weld
Method.
The present invention provides a kind of acidic environment carbon steel piping welding methods, weld in acidic environment carbon steel piping of the invention
It connects in an exemplary embodiment of method, the welding method may include:
Step S01 controls the chemical component of main pipe, and carries out retaining wall on slope and group pair to main pipe.
In order to improve the ability of acid carbon steel hydrogen sulfide corrosion resistant, pipeline service life is improved, maintenance is reduced, then needs to control
The chemical component of main pipe processed.The chemical component of the main pipe can be with according to mass percentage are as follows: and C≤0.14%, Si≤
0.40%, Mn≤1.35%, P≤0.002%, S≤0.003%, Cu≤0.20%, Ni≤0.30%, Cr≤0.30%, Mo≤
0.15%, Al≤0.060%, Ti≤0.04%, B≤0.0005%, Ca≤0.006%, N≤0.012%, remaining be Fe and
Inevitable impurity.Preferably, the chemical component of the main pipe can be with according to mass percentage are as follows: and C≤0.12%, Si≤
0.36%, Mn≤1.35%, P≤0.002%, S≤0.003%, Cu≤0.20%, Ni≤0.30%, Cr≤0.30%, Mo≤
0.15%, Al≤0.060%, Ti≤0.04%, B≤0.0005%, Ca≤0.006%, N≤0.012%, remaining be Fe and
Inevitable impurity.The yield strength of the main pipe can be 245MPa~450MPa, tensile strength can for 415MPa~
760MPa；Hardness can be≤248MPa.The microscopic metallographic structure of the main pipe is the pearlite and ferrite of small grains.For
Acid pipeline-weld hydrogen sulfide corrosion resistant ability is improved, needs to control wlding with good welds, controls weld strength, power
It learns performance and chemical component matches with main pipe, the content of S, P, O in wlding are controlled, to improve weld seam degree of purity, to improve
Welding seam toughness and plasticity improve weld seam sulfur resistive resistant to hydrogen corrosion cracking ability.
In the present embodiment, as shown in Figure 1, the groove can be double V-groove.The root face a of the groove can be 0.5
~1.5mm, further, root face can be 0.75~1.25mm.Bevel angle β can be 60 °~70 °, further, groove
Angle can be 62 °~68 °.Root gap b can be 2.5~3.5mm, further, root gap can for 2.75~
3.25mm.Be arranged above-mentioned root face be advantageous in that can either prevent in root bead occur burn phenomenon, be also avoided that root bead does not weld
Thoroughly.If it is less than the lower limit that it is arranged, root bead is likely to occur burning phenomenon, is likely to out if it is greater than its upper limit value being arranged
Existing lack of penetration phenomenon.Above-mentioned bevel angle, which is arranged, to be advantageous in that, both can guarantee that weld seam penetrates, has been increased intensity, is reduced technique and is lacked
It falls into, and can control deposited metal dosage and dilution rate and the accessibility of guarantee welding gun welding to base material.If set lower than it
Set the lower limit value of bevel angle, not only welding gun can not reach root carry out welding, but also increase deposited metal dilution rate and
It is easy to produce defective workmanship；If being higher than its upper limit value, increases the loading of deposited metal and make increased costs.
Step S02, groove group preheat butt welding mouth after the completion.
In the present embodiment, the temperature of the preheating can be 100 DEG C~150 DEG C, and further, the temperature of preheating can be with
It is 115 DEG C~135 DEG C.Weld preheating for temperature of the present invention is arranged is advantageous in that pre- thermal energy slows down postwelding cooling velocity and has
Overflowed conducive to diffusible hydrogen in weld seam, avoid generate hydrogen induced cracking, moreover it is possible to prevent weld dimensions generate hardened structure and it is crisp
It is disconnected.It is unobvious to the further welding point effect that improves if exceeding the temperature range of above-mentioned setting, weldering is not only resulted in instead
Seam and heat affected area metal grain are coarse, or even generate Widmannstatten structure, also will cause greatly increasing for heating cost, make its economy
Decline in benefits.The preheating should should prevent hot-spot in weld bond two sides and circumferential uniformly progress.The width of preheating can be weldering
Stitch each 90mm~110mm in two sides.Further, the width can be each 100mm in weld seam two sides.The range of above-mentioned setting has been covered
Heat affected areas when having covered welding, i.e. weld seam, heat affected area, base material preheat the range and have been able to satisfy welding point
Diffusible hydrogen overflows and prevents from generating the requirement of hardened structure.If unknown to further improvement welding point effect beyond the range
It is aobvious, it is coarse that Seam and heat effected zone metal grain is not only resulted in instead, or even generate Widmannstatten structure, also will cause heating cost
Greatly increase, make its economic benefit decline.It, can be using the temperature of temperature measurer detection preheating during preheating.
Step S03, after the completion of preheating, butt welding mouth carries out root bead.
In the present embodiment, keeping preheating temperature is 100 DEG C~150 DEG C, I class wlding can be used, using in argon arc welding
Root bead is carried out to weldering.The flow of protective gas when root bead can be 10L/min~15L/min.Under certain condition, gas stream
Amount and nozzle diameter have an optimum range, and gas shield effect is best at this time, and effective protection region is maximum, the stream of above-mentioned setting
It is strong that amount range not only can guarantee that air-flow stiffness excludes well surrounding air ability, but also avoiding generation turbulent flow is involved in air, drops
Low protecting effect.If flow is too low, the bad exclusion surrounding air ability of air-flow stiffness is poor；Flow is excessively high, can generate turbulent volume
Entering air reduces protecting effect.The protective gas can be argon gas (99.99%), certainly, the protective gas that the present invention uses
It is without being limited thereto.When the present invention carries out root bead, multistage welding should be divided into, and be symmetrically and evenly distributed, to reduce welding stress.
The deposited metal composition of the I class wlding includes: C:0.06%~0.15%, Mn by mass percentage
≤ 1.35%, Si:0.45%~0.75%, S≤0.008%, P≤0.020%, Cr≤0.15%, Ni≤0.15%, Cu≤
0.50%, remaining is iron and inevitable impurity.Further, the deposited metal composition of the I class wlding presses matter
Amount percentage meter includes: C:0.06%~0.12%, Mn≤1.30%, Si:0.45%~0.69%, and S≤0.005%, P≤
0.014%, Cr≤0.15%, Ni≤0.15%, Cu≤0.50%.
The yield strength of the I class wlding can be 400MPa~484MPa, tensile strength can for 480MPa~
570MPa.Further, the yield strength of I class wlding can be 421~463MPa, and tensile strength can be 502~548MPa.
The I class wlding is mainly used for root bead, using above-mentioned wlding than strength of parent more slightly higher grade, can be avoided and is carrying out root weldering
Weld seam is very fragile when connecing is easy to generate stress because of external action or even the hidden danger that cracks, and weld corrosion can be increased under acidic environment
Cracking risk.If the yield strength and tensile strength of not up to above-mentioned setting, can make the plasticity toughness of weld seam by a relatively large margin under
Drop considerably increases the risk that weld seam generates hydrogen induced cracking (HIC) and sulfide cracking under acidic environment.
In the present embodiment, during root bead, root bead joint can be polished gentle shape, to guarantee back of weld
Molding is good.
Step S04, butt welding mouth carry out hot weld and filling weldering.
In the present embodiment, hot weld is carried out using II class wlding butt welding mouth and filling is welded.The deposition gold of the II class wlding
Belong to chemical component includes: C≤0.10%, Mn≤1.20%, Si≤0.90% by mass percentage, and S≤0.005%, P≤
0.012%, Cr≤0.20%, Ni≤0.30%, Mo≤0.30%, V≤0.08%, remaining for iron and inevitably it is miscellaneous
Matter.Further, the deposited metal composition of the II class wlding includes: C≤0.08% by mass percentage, and Mn≤
1.15%, Si≤0.70%, S≤0.003%, P≤0.012%, Cr≤0.20%, Ni≤0.30%, Mo≤0.30%, V≤
0.08%.
The yield strength of the II class wlding is 330MPa~380MPa, and tensile strength is 420MPa~500MPa.Into one
Step, the yield strength of the II class wlding can be 342MPa~368MPa, and tensile strength can be 440MPa~480MPa.
Above-mentioned II class wlding intensity, which is arranged, to be advantageous in that, meet and base material equal strength matching, be conducive in this way increase plastic property of weld bead and
Toughness, to improve the performance of weld seam resistance against hydrogen cracking and resisting sulfide cracking under acidic environment.If exceeding above-mentioned setting
Range, may cause weld seam plasticity toughness decline, to reduce weld seam resistance against hydrogen cracking and sulfur resistive under acidic environment
The performance of compound cracking.
In the present embodiment, should start to carry out hot weld as early as possible after the completion of root bead.For example, root bead and heat weldable time interval are not
More than 10min.The hot weld can use welding electrode arc welding, and interlayer temperature can be 100 DEG C~200 DEG C, can use infrared ray
Temperature measurer detects interlayer temperature.
More than, the control of butt welding mouth preheating temperature and interlayer temperature can prevent the shape of heat affected area high rigidity microscopic structure
At the plasticity and toughness of weld seam being improved, to increase the ability of its hydrogen sulfide corrosion resistant.
In the present embodiment, filling weldering can be connect using welding rod arc up hill welding.Interlayer temperature when welding can control
It is 100 DEG C~200 DEG C.Interlayer temperature is controlled in above range, is equal to one layer of welding bead and is played preheating to next layer of welding bead
Effect not only contributes to diffusible hydrogen spilling, reduces cooling velocity and avoids generating hardened structure, and prevents from making because temperature is excessively high again
Seam and heat effected zone metal grain is coarse, or even generates Widmannstatten structure.Lower than the lower range limit, weld seam is easy to produce temperature
Internal stress, while cooling velocity increases, and is also easy to produce hardened structure；Higher than the range higher limit, Seam and heat effected zone metal is brilliant
Grain is coarse, or even generates Widmannstatten structure.
In the present embodiment, when pipeline wall thickness is thicker, the filling weldering can swing welding using multiple tracks, to ensure to melt
Pond can be effectively protected, and good knitting is answered in groove two sides.
In the present embodiment, when the discovery II class wlding is rubescent or inclined arc, welding rod should be replaced immediately.
Step S05, butt welding mouth carry out cosmetic welding.
In the present embodiment, cosmetic welding is carried out using the II class wlding butt welding mouth.The cosmetic welding can use welding rod
Electric arc up hill welding connects.Filling weldering deadline and interval time cosmetic welding time started do not have specific requirement, meet interlayer temperature
It is 100 DEG C~200 DEG C.
In the present embodiment, when groove is wider, for example, the cosmetic welding can be welded using row when width is more than 14mm,
And rear one of weld seam will at least cover the 1/3 of preceding one of weld seam, and should ensure that weld seam and base material rounding off, as much as possible
Reduce the defects of welding stress concentration will at least cover the 1/3 of preceding one of weld seam, can not only be conducive to stomata in preceding one of weld seam
It detaches, moreover it is possible to play the role of heat treatment to it, to improve the plasticity and toughness of weld seam.If before cannot covering together
The 1/3 of weld seam, then the defects of cannot making stomata in preceding one of weld seam, detach, and the effect being heat-treated to it is also unobvious.Lid
After the completion of the weldering of face, the slag of weld seam and the splash of weld seam two sides can be removed using wire brush, and check weld seam with weldering dipping
Presentation quality, if there is excessive defect, timely repairing treatment.
Step S06, carries out non-destructive testing weld seam.
In the present embodiment, consider and arrive weld seam delayed crack, after welding completion for 24 hours, weld seam can be carried out non-destructive testing, it is described
Non-destructive testing can use 100%RT and 100%UT.
In the present embodiment, root bead must not in undercut, ray detection should carry out interior undercut judgement.
In the present embodiment, detection method can use ray detection and ultrasound examination simultaneously.It is examined simultaneously using ray
It surveys and ultrasound examination is in order to detect all kinds of defects such as the three peacekeeping two dimensions generated in weld seam to greatest extent, thus as much as possible
Avoid the ability that weld seam anti-H 2 S is reduced because of the missing inspection of defect.
Step S07, is heat-treated weld seam.
In the present embodiment, can 3 times of weld width regions each to weld seam and its two sides be heat-treated.The work of heat treatment
With being in order to reduce welding line joint residual stress and increase plastic property of weld bead toughness, to improve weld seam hydrogen sulfide corrosion resistant ability.
As shown in Fig. 2, post weld heat treatment may include after being warming up to 380 DEG C~430 DEG C, such as after 400 DEG C, to be not more than 200 DEG C/h
Heating rate be warming up to 610~640 DEG C,；Such as after 610 DEG C, 50min~70min is kept the temperature, to be not more than the drop of 260 DEG C/h
Warm speed is cooled to 380 DEG C~430 DEG C, such as 400 DEG C, is cooled to room temperature.
More than, the holding temperature that heat treatment is arranged, which is 610 DEG C~640 DEG C, is advantageous in that the range belongs to high tempering,
Tempered sorbite can be obtained, as ferrite+fine grained cementite mixture, can not only reduce weld seam residualinternal stress, and
Plastic property of weld bead and toughness can also be improved.If exceeding above range, it may occur that tissue and phase transformation, to change the power of weld seam
Learn performance.Further, holding temperature can be 620~630 DEG C, and further, holding temperature can be 625 DEG C.
Soaking time can be 50~70min.Above-mentioned soaking time, which is arranged, so that carbon atom is uniformly diffuseed to form
Statenchyma phase, and coarse grains can also be prevented.If soaking time is too short, carbon atom cannot effectively be spread, formation group
It knits also uneven；Time is too long, and grain structure may be made coarse.Further, soaking time can be 55~65min, more
Further, soaking time can be 60min.
Heat treatment is to be warming up to 380 DEG C~430 DEG C heating rates below unlimited, because the temperature following temperature is to carbon original
Sub- diffusion velocity influence is smaller, so the tissue effect to formation is also little.380 DEG C~430 DEG C or more of heating rate can be with
For less than 200 DEG C/h, for example, can be 50 DEG C/h~150 DEG C/h.Be arranged above-mentioned heating rate be conducive to carbon atom diffusion more fill
Point, keep grain structure ingredient more uniform, and reduce the defect of grain structure, residual stress is reduced, to improve weld seam
Plasticity and toughness.If temperature rises too fast, carbon atom diffusion is insufficient in crystal grain, and it is uneven to will cause structural constituent in this way,
Cannot achieve reduces weld stress effect, so that the plasticity of weld seam and toughness cannot be made to improve.In temperature-fall period, 380 DEG C~
430 DEG C or more of cooling rate can be less than 260 DEG C/h, for example, can be 65~195 DEG C/h.Above-mentioned cooling rate is set
It is advantageous in that, is conducive to generate the ferrite and pearlite tissue with preferable plasticity and toughness, improves the anticorrosive of weld seam
Ability.If cooling velocity is too fast, it has been even more than metal critical cooling velocity, hardness and the biggish horse of brittleness may be generated
Family name's body tissue, this can be such that weld metal acid-resisting corrosive power substantially reduces.For 380 DEG C~430 DEG C cooling rates below
It is unlimited, because 380 DEG C~430 DEG C or less cooling rates are smaller to carbon atom diffusion and tissue morphology and stress influence,
Its cooling rate is not controlled to be conducive to control construction cost, is increased economic efficiency.
In the present embodiment, the heat treatment can use crawler type or rope type electric heating, for example, Equipment for Heating Processing model
It can be WDK-FS-612060T, which, which belongs to automatically control, selects the control of programmable input mode to set
Standby, temperature control and heating power supply input use intelligent temperature control device, entire heat treated after inputting heat treatment process parameter
Journey is automatically performed by the parameter of input, and heat treatment temperature data and the printable output of curve, can effectively guarantee to be heat-treated
Accuracy.
In conclusion by means of the present invention, welding point can be made in HIC the and SSC performance detection of standard solution
In hydrogen induced cracking (HIC) (HIC) test, crack length rate average value, crack thickness rate average value and crack-sensitivity rate average value are full
Sufficient standard and design requirement；It can make welding point in sulfide stress cracking (SSC) (SSC) test, test specimen is split without any surface
Line；The anti-corrosion effects of acidic environment carbon steel piping can be made significantly to be improved, pipeline in production application
Because the probability of corrosion leakage reduces；The cost of maintenance and maintenance can be reduced.
Although having been combined attached drawing above and exemplary embodiment describing the present invention, those of ordinary skill in the art
It will be apparent to the skilled artisan that can be carry out various modifications to above-described embodiment in the case where not departing from spirit and scope of the claims.
Claims (10)
1. a kind of acidic environment carbon steel piping welding method, which is characterized in that the described method includes:
Main pipe chemical component is controlled, retaining wall on slope and group pair are carried out to main pipe；
Main pipe weld bond of the group to after is preheated；
Root bead is carried out to the weld bond after preheating using I class wlding；
Hot weld, filling weldering and cosmetic welding are carried out using II class wlding butt welding mouth；
Post weld heat treatment is carried out after non-destructive testing, completes carbon steel piping welding, wherein
The chemical component of the main pipe is by mass percentage are as follows: and C≤0.14%, Si≤0.40%, Mn≤1.35%, P≤
0.002%, S≤0.003%, Cu≤0.20%, Ni≤0.30%, Cr≤0.30%, Mo≤0.15%, Al≤0.060%, Ti
≤ 0.04%, B≤0.0005%, Ca≤0.006%, N≤0.012%, remaining is Fe and inevitable impurity；
The deposited metal composition of the I class wlding includes: C:0.06%~0.15% by mass percentage, and Mn≤
1.35%, Si:0.45%~0.75%, S≤0.008%, P≤0.020%, Cr≤0.15%, Ni≤0.15%, Cu≤
0.50%；
The deposited metal composition of the II class wlding includes: C≤0.10%, Mn≤1.20%, Si by mass percentage
≤ 0.90%, S≤0.005%, P≤0.012%, Cr≤0.20%, Ni≤0.30%, Mo≤0.30%, V≤0.08%.
2. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the I class wlding surrender
Intensity is 400MPa~484MPa, and tensile strength is 480MPa~570MPa, and the yield strength of the II class wlding is 330MPa
~380MPa, tensile strength are 420MPa~500MPa.
3. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the groove is V-type slope
Mouthful, the root face of the groove is 0.5mm~1.5mm, and bevel angle is 60 °~70 °, and root gap is 2.5mm~3.5mm.
4. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the temperature of the preheating is
100 DEG C~150 DEG C, the width of preheating is each 90mm~110mm in weld seam two sides.
5. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the root bead uses argon arc
Up hill welding is welded, the flow of protective gas is 10L/min~15L/min.
6. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the hot weld uses welding rod
Arc welding, weld interpass temperature are 100 DEG C~200 DEG C, and the weld interval time between the root bead and the hot weld is no more than
10min。
7. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the filling weldering is using weldering
Electric arc up hill welding connects, and weld interpass temperature is 100 DEG C~200 DEG C.
8. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the cover welding uses
Welding rod arc up hill welding connects.
9. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the non-destructive testing starts
The interval of time and welding deadline are greater than for 24 hours.
10. acidic environment carbon steel piping welding method according to claim 1, which is characterized in that the post weld heat treatment
After being warming up to 380 DEG C~430 DEG C, 610~640 DEG C are warming up to the heating rate no more than 200 DEG C/h, keeps the temperature 50min
~70min is cooled to 380 DEG C~430 DEG C with the cooling rate no more than 260 DEG C/h, is cooled to room temperature.
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