CN108620716A - A kind of welding procedure of reburner pipeline - Google Patents
A kind of welding procedure of reburner pipeline Download PDFInfo
- Publication number
- CN108620716A CN108620716A CN201810383478.5A CN201810383478A CN108620716A CN 108620716 A CN108620716 A CN 108620716A CN 201810383478 A CN201810383478 A CN 201810383478A CN 108620716 A CN108620716 A CN 108620716A
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- pipeline
- welding
- wall pipe
- reburner
- welded
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a kind of welding procedures of reburner pipeline, include the following steps：a）Pipeline is cut；b）Preweld cleaning and protection；c）Group uses positioning fixture to pipeline；d）The boiler tube of reburner is welded；e）The hot wall pipe of reburner is welded with cold wall pipe.The characteristics of present invention is generally directed to MAN900 materials, a set of new welding procedure is provided, it grows up with the HOT CRACK FOR WELDING P and superheat region crystal grain for solving the problems, such as MAN900 materials, the qualified water equality of base metals is not achieved in " equal strength " of welding point, reheat crack(ing), the intensity of Seam and heat effected zone and plasticity, ensure that welding point has excellent creep-resistant property and higher thermal shock resistance, the service life of MAN900 tubing is greatly improved, it is ensured that multiple advantages such as equipment safety production.
Description
Technical field
The invention belongs to pipeline welding technology fields, more particularly to a kind of reburner suitable for petroleum and petrochemical industry chemical field
Pipeline welding process.
Background technology
Nickel base superalloy not only has good mechanical behavior under high temperature, while also having good corrosion resistance,
There is better creep-resistant property and higher heat resistanceheat resistant to rush for improvement of the MAN900 as high-temperature nickel-based material 25Cr-32Ni materials
Hit performance, good extension property after timeliness is widely used in petrochemical plant hydrogen manufacturing conversion furnace, and solves MAN900 materials
The HOT CRACK FOR WELDING P and superheat region crystal grain of material grow up, welding point " equal strength ", reheat crack(ing), Seam and heat effected zone
The qualified water equality problem of base metals is not achieved in intensity and plasticity, always is producer of various countries primary study problem.
Invention content
It is an object of the invention to：In view of the above problems, a kind of welding mainly for MAN900 materials is provided,
It can effectively avoid generating fire check, it is ensured that obtain the welding procedure of the reburner pipeline of excellent welding point.
The technical proposal of the invention is realized in this way：A kind of welding procedure of reburner pipeline, it is characterised in that：Including
Following steps：
a）Pipeline is cut, according to the difference of duct thickness, unilateral double V-groove or unilateral double V-shaped groove is respectively adopted；
b）Preweld cleaning and protection, clear up a certain range of region of groove and both sides, and brush and protect before welding
Protect agent；
c）It includes snap ring and the positioning regulating structure that is connect with snap ring that group uses positioning fixture, the positioning fixture to pipeline,
The snap ring is used to be fixed on the end of any pipeline to be welded in welding, and the positioning regulating structure is used for group
Positioning clamping is carried out to another pipeline to be welded in welding；
d）The boiler tube of reburner is welded, the boiler tube is MAN900 materials, is arranged first in the supervisor of hot wall pipe stifled
Plate arranges more inflations by the way that the space of relative closure is integrally formed between the orifice plate in closure plate and each boiler tube in hot wall pipe
Pipeline, more gas ductings pass through closure plate, for being filled with protection gas into enclosure space, when being welded to boiler tube and hot wall pipe boss
The back side is protected, and after the completion of all welding of tubes, will be arranged by the traction piece being connected on closure plate and is responsible in hot wall pipe
Interior closure plate takes out；
e）The hot wall pipe of reburner is welded with cold wall pipe, is respectively set closure plate in hot wall pipe and cold wall pipe first, two
A closure plate is arranged in the group weld seam both sides to be welded to pipeline, and relatively closed sky is formed in the pipeline between two closure plates
Between, protection gas is filled with into sealing space by gas tip, the back side is protected when being welded with cold wall pipe to hot wall pipe, works as weldering
After the completion of connecing, the closure plate being arranged in hot wall pipe and cold wall pipe is taken out by the traction piece being connected on closure plate.
The welding procedure of reburner pipeline of the present invention, in the step a）In, the groove of pipeline uses line slope
Mouth cutting machine cuts into double V-groove, and as pipeline wall thickness T≤19mm, the groove uses unilateral double V-groove, bevel angle
It is 37.5 ° ± 2.5；As pipeline wall thickness T ＞ 19, the groove is using unilateral double V-shaped groove, first order bevel angle
37.5 ° ± 2.5, second level bevel angle is 10 ° ± 1.
The welding procedure of reburner pipeline of the present invention, in the step b）In, with stainless steel wire brush or special
Abrasive machine is cleared up, and cleaning area is to correspond within the scope of groove and each 100mm in both sides, then cleaned up with acetone, welding rod electricity
When arc-welding, within the scope of each 100mm in groove both sides, using before welding brushing protective agent prevent spatter object from staiing weldment surface
Measure.
The welding procedure of reburner pipeline of the present invention, in the step c）In, when pipe string, weldment application
Ground is isolated in sleeper or rubber slab place mat, uses material for MAN900 or the block that is located by connecting of austenitic stainless steel, using tungsten electrode
Argon arc welding technique of spot welding stainless steel built-up welding link block on the inside of groove is grouped, and each link block spot welding position must be
The same side, group should not exceed the 10% of wall thickness to the inner wall misalignment of pipeline, and must not exceed 0.5mm, if inner wall unfitness of butt joint is more than rule
Definite value should open 1：4 taper internal groove.
The welding procedure of reburner pipeline of the present invention, in the step c）In, the positioning regulating structure packet
Include linking arm and at least three along clamped pipeline radial arrangement positioning head, the snap ring and positioning head are located at group pair
The weld seam both sides that pipeline is formed afterwards, the linking arm are fixedly connected across the weld seam, one end of the linking arm with snap ring,
The other end is flexibly connected with positioning head, and each positioning head can be moved radially relative to linking arm, and the positioning head is used for will
Another pipeline to be welded carries out positioning clamping in welding.
The welding procedure of reburner pipeline of the present invention, the snap ring are made of at least two parts, and pass through company
Connected components link together, and hold the periphery for being fixed on corresponding pipeline to be welded tightly, the positioning heads of at least three radial arrangements with
The axial centre of clamped pipeline is uniformly distributed, and each positioning head is connect by corresponding linking arm with snap ring respectively, institute
Welded pipe line formation positioning clamping is treated in the common cooperation in end face for stating the positioning head of at least three radial arrangements.
The welding procedure of reburner pipeline of the present invention, in the step d）In, the more gas ducting edges
Arrangement in hot wall pipe, the outlet ports of the more gas ductings are located at different location in hot wall pipe, and from middle part to
Periphery is sequentially arranged, wherein each gas ducting at least corresponds to three boiler tubes, the gas ducting can will correspond in boiler tube
Air is replaced completely, and the traction piece extends along pipeline and extend out to pipeline external, and the traction piece is used for after the completion of welding,
Closure plate in hot wall pipe is taken out.
The welding procedure of reburner pipeline of the present invention, in the step e）In, between described two closure plates
It is provided with connector, the connector both ends are joined together to form overall structure with corresponding closure plate respectively, and the connector is used
In the maximum relative distance for limiting two closure plates.
The welding procedure of reburner pipeline of the present invention, the closure plate is by cavernous body and is arranged in cavernous body two
The metal skin of side end face forms, and cavernous body is clipped in the middle and forms overall structure, the closure plate periphery and pipe by the metal skin
Road inner wall fits closely, and the diameter of the cavernous body is more than the internal diameter of pipeline, when the cavernous body periphery and inner wall of the pipe are close
When fitting, for the cavernous body there are certain compressive deformation, the metal skin diameter of the cavernous body both ends of the surface is less than the internal diameter of pipeline.
The welding procedure of reburner pipeline of the present invention, when pipeline welds, filled with certain pressure in pipeline
Argon gas protects gas, is completed until pipeline welds；Wherein when boiler tube and hot wall pipe boss weld, using two welders simultaneously from heat
Wall pipe both ends toward intermediate primer weld, first pass fill to most four welders when cover welding simultaneously welding, every welder,
Per pass weld bond can only weld together, then weld down one of weld bond every time, in cycles；When hot wall pipe and cold wall pipe weld, beat
By welder's welding when bottom and first of filling welding, third layer is filled to the welding of capping by two welders simultaneously, in the same direction
Welding.
The characteristics of present invention is generally directed to MAN900 materials provides a set of new welding procedure, has and solves MAN900 materials
The HOT CRACK FOR WELDING P and superheat region crystal grain of material grow up, " equal strength " of welding point, reheat crack(ing), Seam and heat effected zone
The qualified water equality problem of base metals is not achieved in intensity and plasticity, it is ensured that welding point have excellent creep-resistant property and compared with
The service life of MAN900 tubing is greatly improved in high thermal shock resistance, it is ensured that multiple advantages such as equipment safety production.
Description of the drawings
Fig. 1 and Fig. 2 is the structural schematic diagram of two kinds of double V-grooves in the present invention.
Fig. 3 and Fig. 4 is the structural schematic diagram of positioning fixture in the present invention.
Fig. 5 is the welding schematic diagram of block of being located by connecting in the present invention.
Fig. 6 is the structural schematic diagram of welding of tubes in the present invention.
Fig. 7 is the portions A enlarged drawing in Fig. 6.
Fig. 8 is hot wall pipe welded structure schematic diagram in the present invention.
Fig. 9 is the portions B enlarged drawing in Fig. 8.
It is marked in figure：1 is snap ring, and 2 be linking arm, and 3 be positioning head, and 4 be stud, and 5 be locking nut, and 6 be groove,
7 be the block that is located by connecting, and 8 be boiler tube, and 9 be hot wall pipe, and 10 be supervisor, and 11 be closure plate, and 12 be orifice plate, and 13 be gas ducting, and 14 are
Traction piece, 15 be weld seam, and 16 be gas tip, and 17 be connector, and 18 be cold wall pipe, and 19 be cavernous body, and 20 be metal skin.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The technology of the present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain this hair
It is bright, it is not used to limit invention.
Embodiment：A kind of welding procedure of reburner pipeline, includes the following steps：
a）Pipeline is cut, the groove 6 of pipeline cuts into double V-groove using line groove cutting machine, according to duct thickness
Unilateral double V-groove or unilateral double V-shaped groove is respectively adopted in difference.As shown in Figure 1, as pipeline wall thickness T≤19mm, the slope
It is 37.5 ° ± 2.5 that mouth, which uses unilateral double V-groove, bevel angle,；As shown in Fig. 2, as pipeline wall thickness T ＞ 19, the groove
Using unilateral double V-shaped groove, first order bevel angle is 37.5 ° ± 2.5, and second level bevel angle is 10 ° ± 1.For pipe
Trepanning on road should use the mechanical means such as bench drill or angle grinder to carry out trepanning and reconditioning groove, and grinder buffing must be special, beats
The grinding wheel of honed other materials cannot use, when polishing, it should be noted that groove and its uniformity of cooperation, and polishing hair should be removed
Thorn.
b）Preweld cleaning and protection, are cleared up with stainless steel wire brush or special grinding wheel machine, and cleaning area is corresponding groove
And oxide skin, grease, dust and other pollutants etc. within the scope of each 100mm in both sides, then cleaned up with acetone, welding rod electricity
When arc-welding, within the scope of each 100mm in groove both sides, using before welding brushing protective agent prevent spatter object from staiing weldment surface
Measure.
c）Group uses positioning fixture to pipeline, when pipe string, weldment application sleeper or rubber slab place mat isolation ground, such as
It shown in Fig. 5, uses material for MAN900 or the block 7 that is located by connecting of austenitic stainless steel, is welded on the inside of groove using tungsten argon arc
The technique of spot welding stainless steel built-up welding link block is grouped, and each link block spot welding position must be in the same side, and group is to pipeline
Inner wall misalignment should not exceed the 10% of wall thickness, and must not exceed 0.5mm, if inner wall unfitness of butt joint is more than specified value, 1 should be opened：4
Taper internal groove；Base material surface does not allow to leave crator and trace, in order to avoid damaging base material in the welding of base material surface, using special
Positioning fixture first positions.
As shown in Figures 3 and 4, the positioning fixture includes snap ring 1 and the positioning regulating structure that is connect with snap ring 1, described
Positioning regulating structure includes the positioning head 3 of L-shaped linking arm 2 and at least three along clamped pipeline radial arrangement, described
One end of linking arm 2 is fixedly connected with snap ring 1, and the other end is flexibly connected with positioning head 3, and the snap ring 1 is distinguished with positioning head 3
Positioned at the weld seam both sides that group forms rear pipeline, the linking arm 2 across the weld seam, and both ends respectively with snap ring 1 and corresponding
Positioning head 3 connects, wherein each positioning head 3 can be moved radially relative to linking arm 2, the snap ring 1 is for connecting and fixing
The end of any pipeline to be welded in welding, the snap ring 1 is made of at least two parts, and is connected by connection component
Together, and the periphery for being fixed on corresponding pipeline to be welded is held tightly, the connection component includes stud 4 and locking nut 5,
The stud 4 passes through the through-hole of 1 end set of snap ring, and is locked together each section of snap ring by locking nut 5,
The positioning head 3 is used to another pipeline to be welded in welding carrying out positioning clamping.
Wherein, the positioning head 3 of at least three radial arrangements is uniformly distributed with the axial centre for being clamped pipeline, described each
Positioning head 3 is connect by corresponding linking arm 2 with snap ring 1 respectively, and the end face of the positioning head 3 of at least three radial arrangement is total
Welded pipe line is treated with cooperation and forms positioning clamping, and the positioning head 3 is connect with 2 end thread of linking arm, passes through rotational positioning
First 3 can adjust its diametrical position, in order to adjust the pipeline being matched for clamping tightly by multiple positioning heads with group pair it is another
Pipeline location centering.
d）The boiler tube of reburner is welded, the boiler tube is MAN900 materials, as shown in Figures 6 and 7, first in hot wall
Closure plate 11 is set in the supervisor 10 of pipe 9, by the sky that relative closure is integrally formed between the orifice plate 12 in closure plate 11 and each boiler tube 8
Between, to ensure that each boiler tube and the weld seam 15 of hot wall pipe boss welding are in sealing space, more inflations of arrangement in hot wall pipe 9
Pipeline 13, more gas ductings 13 pass through closure plate 11, for being filled with the argon gas of purity >=99.999% into enclosure space, to boiler tube 8
The back side is protected when being welded with 9 boss of hot wall pipe, after the completion of all welding of tubes, passes through the traction being connected on closure plate 11
Part 14 takes out the closure plate 11 being arranged in the supervisor 10 of hot wall pipe 9.
Wherein, the more gas ductings 13 arrangement in hot wall pipe 9, the outlet port point of the more gas ductings 13
Not Wei Yu different location in hot wall pipe 9, and be sequentially arranged from middle part to periphery, so that the outlet port of gas ducting can use up
Amount covers all boiler tube positions, wherein each gas ducting 13 at least corresponds to three boiler tubes 8, the gas ducting 13 can
Air in corresponding boiler tube 8 is replaced completely, the traction piece 14 extends along pipeline and extend out to pipeline external, the traction piece
14 for after the completion of welding, the closure plate in hot wall pipe to be taken out.
e）The hot wall pipe 9 and cold wall pipe 18 of reburner are welded, as shown in FIG. 8 and 9, first in hot wall pipe 9 and cold
Closure plate 11 is respectively set in wall pipe 18, two closure plates 11 are arranged in group weld seam 15 both sides to be welded to pipeline, and two closure plates
Relatively closed space is formed in pipeline between 11, and purity >=99.999% is filled with into sealing space by gas tip 16
Argon gas, the back side is protected when being welded with cold wall pipe 18 to hot wall pipe 9, when the welding is completed, by being connected on closure plate 11
Traction piece 14 takes out the closure plate 11 being arranged in hot wall pipe 9 and cold wall pipe 18.
Wherein, connector 17 is provided between described two closure plates 11, the connector uses galvanized wire, the company
17 both ends of fitting are joined together to form overall structure with corresponding closure plate 11 respectively, and the connector 17 is for limiting two closure plates
11 maximum relative distance.
In step d）With step e）In, the closure plate 11 is by cavernous body 19 and gold in 19 both sides of the face of cavernous body is arranged
Belong to skin 20 to form, the metal skin uses galvanized iron sheet, the metal skin 20 cavernous body 19 to be clipped in the middle and by galvanized screw
Connection forms overall structure, and 11 periphery of the closure plate is fitted closely with inner wall of the pipe, and the diameter of the cavernous body 19 is more than pipeline
Internal diameter, when 19 periphery of the cavernous body and inner wall of the pipe fit closely, the cavernous body 19 there are certain compressive deformation, with
Ensure certain leakproofness, 20 diameter of metal skin of 19 both ends of the surface of the cavernous body is less than the internal diameter of pipeline, in order to closure plate energy
Enough it is taken out conveniently；In addition, in order to ensure that argon gas protection is abundant, the present invention is converted into gas argon using liquid argon, then passes through distributor
To each welding position, this not only increases construction efficiency, decrease argon gas usage amount, cost-effective.
In the present embodiment, as 5 DEG C of environment temperature ＜, it is preheated to >=5 DEG C, then welding, when pipeline welds, pipe
The argon gas filled with certain pressure protects gas in road, is completed until pipeline welds；Wherein when boiler tube and hot wall pipe boss weld, adopt
It is welded from hot wall pipe both ends toward intermediate primer with two welders, is filled to most four welders when cover welding in first pass simultaneously
Welding simultaneously, every welder, per pass weld bond can only weld together, then weld down one of weld bond every time, in cycles；In hot wall
When pipe is welded with cold wall pipe, by welder's welding when bottoming and first of filling are welded, third layer is filled to the welding of capping
By two welders simultaneously, welding in the same direction.
During welding, root run cross sectional shape is controlled as far as possible, and position among welding bead is avoided to form protrusion, shunting weldering
It is welded from groove both sides toward centre when connecing, when welding blow-out, arc crater is filled up, the generation of defect is prevented, every time when welding all
Polishing joint should be clean by crackle polishing immediately if occurring fire check at arc crater, and per pass has been welded face of weld
It is welded again after polishing metallic luster.
When carrying out root layer welding, by two welders respectively inside and outside workpiece from bottom to top while the manual tungsten electrode that carries out
Argon arc welding, the outer welding gun elder generation striking of pipeline, in pipeline welder see steel plate it is rubescent when, at 5mm below striking keep up with, two rifles want base
This synchronization, two rifle spacing keep a molten bath length, and back side welding gun cannot be advanced, when centre stops arc or changes welding wire, to accuse in time
Other side is told, until root layer welding terminates.
The present invention is directed to the welding procedure of MAN900, and pipeline inner and outer welding is once-forming, which is to keep away
The generation for having exempted from fire check, improves quality of weld joint, it is ensured that welding quality, it is ensured that the safe operation of device extends
The service life of device meets the national policy of energy-saving and emission-reduction.Have solder yield high simultaneously, reduces Weld Seam Repairation amount, section
It saves and largely reprocesses expense, improve welding work efficiency, shorten the engineering construction period, accelerate construction progress, be a kind of energy-efficient, excellent
Matter, economic welding technique.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. a kind of welding procedure of reburner pipeline, it is characterised in that：Include the following steps：
a）Pipeline is cut, according to the difference of duct thickness, unilateral double V-groove or unilateral double V-shaped groove is respectively adopted；
b）Preweld cleaning and protection, clear up a certain range of region of groove and both sides, and brush and protect before welding
Protect agent；
c）It includes snap ring and the positioning regulating structure that is connect with snap ring that group uses positioning fixture, the positioning fixture to pipeline,
The snap ring is used to be fixed on the end of any pipeline to be welded in welding, and the positioning regulating structure is used for group
Positioning clamping is carried out to another pipeline to be welded in welding；
d）The boiler tube of reburner is welded, the boiler tube is MAN900 materials, is arranged first in the supervisor of hot wall pipe stifled
Plate arranges more inflations by the way that the space of relative closure is integrally formed between the orifice plate in closure plate and each boiler tube in hot wall pipe
Pipeline, more gas ductings pass through closure plate, for being filled with protection gas into enclosure space, when being welded to boiler tube and hot wall pipe boss
The back side is protected, and after the completion of all welding of tubes, will be arranged by the traction piece being connected on closure plate and is responsible in hot wall pipe
Interior closure plate takes out；
e）The hot wall pipe of reburner is welded with cold wall pipe, is respectively set closure plate in hot wall pipe and cold wall pipe first, two
A closure plate is arranged in the group weld seam both sides to be welded to pipeline, and relatively closed sky is formed in the pipeline between two closure plates
Between, protection gas is filled with into sealing space by gas tip, the back side is protected when being welded with cold wall pipe to hot wall pipe, works as weldering
After the completion of connecing, the closure plate being arranged in hot wall pipe and cold wall pipe is taken out by the traction piece being connected on closure plate.
2. the welding procedure of reburner pipeline according to claim 1, it is characterised in that：In the step a）In, pipeline
Groove double V-groove is cut into using line groove cutting machine, as pipeline wall thickness T≤19mm, the groove use unilateral V-type slope
Mouthful, bevel angle is 37.5 ° ± 2.5；As pipeline wall thickness T ＞ 19, the groove use unilateral double V-shaped groove, first
Grade bevel angle is 37.5 ° ± 2.5, and second level bevel angle is 10 ° ± 1.
3. the welding procedure of reburner pipeline according to claim 1, it is characterised in that：In the step b）In, with not
Rust wire brush or special grinding wheel machine are cleared up, and cleaning area is within the scope of corresponding groove and each 100mm in both sides, then clear with acetone
Wash clean, when welding electrode arc welding, within the scope of each 100mm in groove both sides, using before welding brushing protective agent prevent spatter
Object stains the measure on weldment surface.
4. the welding procedure of reburner pipeline according to claim 1, it is characterised in that：In the step c）In, pipeline
Ground is isolated in group clock synchronization, weldment application sleeper or rubber slab place mat, uses material for the positioning of MAN900 or austenitic stainless steel
Link block, the technique that spot welding stainless steel built-up welding link block on the inside of groove is welded in using tungsten argon arc are grouped, each link block
Spot welding position all must be in the same side, and group should not exceed the 10% of wall thickness to the inner wall misalignment of pipeline, and must not exceed 0.5mm, if
Inner wall unfitness of butt joint is more than specified value, should open 1：4 taper internal groove.
5. the welding procedure of reburner pipeline according to claim 1, it is characterised in that：In the step c）In, it is described
Positioning regulating structure include linking arm and at least three along clamped pipeline radial arrangement positioning head, the snap ring with positioning
Head is located at the weld seam both sides that group forms rear pipeline, the linking arm across the weld seam, one end of the linking arm and
Snap ring is fixedly connected, and the other end is flexibly connected with positioning head, and each positioning head can be moved radially relative to linking arm, institute
Positioning head is stated for another pipeline to be welded in welding to be carried out positioning clamping.
6. the welding procedure of reburner pipeline according to claim 5, it is characterised in that：The snap ring is by least two parts
Composition, and linked together by connection component, and hold the periphery for being fixed on corresponding pipeline to be welded tightly, at least three is radial
The positioning head of arrangement is uniformly distributed with the axial centre for being clamped pipeline, and each positioning head passes through corresponding linking arm respectively
It is connect with snap ring, welded pipe line formation locating clip is treated in cooperation jointly for the end face of the positioning head of at least three radial arrangement
It holds.
7. the welding procedure of reburner pipeline according to claim 1, it is characterised in that：In the step d）In, it is described
More gas ductings arrange that the outlet port of the more gas ductings is located in hot wall pipe different positions along hot wall pipe
It sets, and is sequentially arranged from middle part to periphery, wherein each gas ducting at least corresponds to three boiler tubes, the gas ducting can
Air in corresponding boiler tube is replaced completely, the traction piece extends along pipeline and extend out to pipeline external, and the traction piece is used
In after the completion of welding, the closure plate in hot wall pipe is taken out.
8. the welding procedure of reburner pipeline according to claim 1, it is characterised in that：In the step e）In, institute
It states and is provided with connector between two closure plates, the connector both ends are joined together to form whole knot with corresponding closure plate respectively
Structure, the connector are used to limit the maximum relative distance of two closure plates.
9. the welding procedure of reburner pipeline according to claim 7 or 8, it is characterised in that：The closure plate is by cavernous body
And the metal skin composition in cavernous body both sides of the face is set, cavernous body is clipped in the middle and forms whole knot by the metal skin
Structure, the closure plate periphery are fitted closely with inner wall of the pipe, and the diameter of the cavernous body is more than the internal diameter of pipeline, when the cavernous body
When periphery is fitted closely with inner wall of the pipe, there are certain compressive deformation, the metal skins of the cavernous body both ends of the surface for the cavernous body
Diameter is less than the internal diameter of pipeline.
10. the welding procedure of reburner pipeline according to claim 9, it is characterised in that：When pipeline welds, in pipeline
Argon gas filled with certain pressure protects gas, is completed until pipeline welds；Wherein when boiler tube and hot wall pipe boss weld, using two
Name welder welds from hot wall pipe both ends toward intermediate primer simultaneously, is filled to most four welders when cover welding simultaneously in first pass
Welding, every welder, per pass weld bond can only weld together, then weld down one of weld bond every time, in cycles；Hot wall pipe with
When cold wall pipe welds, by welder's welding when bottoming and first of filling are welded, third layer fills the welding to capping by two
Name welder simultaneously, welding in the same direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810383478.5A CN108620716B (en) | 2018-04-26 | 2018-04-26 | Welding process of reformer pipeline |
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|---|---|---|---|
| CN201810383478.5A CN108620716B (en) | 2018-04-26 | 2018-04-26 | Welding process of reformer pipeline |
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| CN108620716A true CN108620716A (en) | 2018-10-09 |
| CN108620716B CN108620716B (en) | 2021-02-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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