CN114310000A - Composite welding type vinylidene fluoride cracking furnace tube and welding method thereof - Google Patents
Composite welding type vinylidene fluoride cracking furnace tube and welding method thereof Download PDFInfo
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- CN114310000A CN114310000A CN202111655326.4A CN202111655326A CN114310000A CN 114310000 A CN114310000 A CN 114310000A CN 202111655326 A CN202111655326 A CN 202111655326A CN 114310000 A CN114310000 A CN 114310000A
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- 238000003466 welding Methods 0.000 title claims abstract description 202
- 238000005336 cracking Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 9
- 238000005493 welding type Methods 0.000 title claims abstract description 6
- 239000013078 crystal Substances 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 claims description 12
- 230000004927 fusion Effects 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 4
- 229910001055 inconels 600 Inorganic materials 0.000 claims description 4
- 239000006104 solid solution Substances 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 10
- 230000009471 action Effects 0.000 abstract description 2
- 238000011221 initial treatment Methods 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 abstract description 2
- 239000011324 bead Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a composite welding type vinylidene fluoride cracking furnace tube and a welding method thereof, in particular to the technical field of welding, wherein the primary welding after chamfering is adopted, the primary welding adopts a laser heat conduction welding mode and carries out a primary treatment process at the speed of 250-350 mm/min, so that a molten pool is in a shallow depth state under the conditions of slower welding speed and power, and then a secondary welding process is carried out under the action of an auxiliary welding wire, the chamfering position is flattened under the condition of supplementing the auxiliary welding wire, simultaneously, two chamfering surfaces form a larger-area molten pool range, the molten auxiliary welding wire is mixed, the original structure is a columnar crystal structure, the welding layer is an equiaxed crystal structure, the combination part of the original structure and the welding layer is in a combined structure of reticular crystals, and under the condition of keeping the surface of the outer wall to be more flat, the welding firmness is greatly improved, and the integral tensile strength can be kept above 600 MPa.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a composite welding type vinylidene fluoride cracking furnace tube and a welding method thereof.
Background
The cracking furnace is a device for cracking hydrocarbons. The requirement for the cracking furnace is to heat the reactants rapidly to
The method has the advantages that the ethylene balance yield is ensured, heat supply and heat transfer are required to be ensured, meanwhile, the medium retention time is short, the generation of coke in the cracking process is reduced, and when the furnace tube in the cracking furnace is produced, the furnace tube cannot be formed in one step due to the change of the length and the shape of the furnace tube, and the furnace tube needs to be formed in a welding mode.
The conventional composite welding mode has many advantages, however, in the current welding process, in order to ensure the material performance of a welding layer, the welding temperature and the welding strength are controlled within a certain range, so that the depth of a formed molten pool is limited, the solid thickness of the welding bead is always a certain distance away from the wall thickness, and when a melting bridge is connected in the molten pool, the surface of the welding bead is often protruded to a large extent, so that the welding surface is not smooth enough, and the optimal welding strength cannot be achieved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a composite welding type vinylidene fluoride cracking furnace tube and a welding method thereof, and the technical problems to be solved by the invention are as follows: in the current welding process, the depth of a formed molten pool is limited, so that the solid thickness of a welding bead is limited, and the problem that the optimal welding strength cannot be achieved is solved.
In order to achieve the purpose, the invention provides the following technical scheme: a welding method of a vinylidene fluoride cracking furnace tube comprises the following steps:
s1, preparing two vinylidene fluoride cracking furnace tubes required by welding, and grinding and chamfering the welded junctions at the outer sides.
And S2, performing primary welding on one side of the chamfer angle at a speed of 250-350 mm/min by a laser heat conduction welding mode with the power density of less than 10-10W/cm.
And S3, bundling auxiliary welding wires on the surface of the primary welding position, filling the chamfer position, and performing secondary welding.
And S4, carrying out deep fusion welding by laser with the power density larger than 10-10W/cm during secondary welding, and continuously welding the auxiliary welding wire at the welding speed of 250-350 mm/min until the welding surface forms a reticular crystal structure layer.
As a further scheme of the invention: the time interval between the secondary welding and the primary welding is based on that the surface temperature of the workpiece after the primary welding is reduced to be less than or equal to 80 ℃.
As a further scheme of the invention: the auxiliary welding wire is an Inconel600 solid solution strengthening alloy material containing 70% -80% of NI.
As a further scheme of the invention: and after the primary welding is finished, carrying out induction heat treatment on the welding opening position.
As a further scheme of the invention: protective gas is inserted into both the primary welding and the secondary welding, and the protective gas comprises gas with the proportion of more than 60 percent of the total volume of one or more of carbon dioxide, argon, helium and nitrogen.
As a further scheme of the invention: the width of the secondary welding channel is 3.4mm, and the thickness of the reticular crystal structure layer comprises 0.3-0.6 mm.
As a further scheme of the invention: the protective gas is high-heat airflow when being sprayed out, and the airflow flowing direction is opposite to the welding direction.
The invention has the beneficial effects that: the invention adopts a mode of two-time composite welding, combines the integral welding process control under the matching of the chamfer angle and the auxiliary welding wire, ensures that the molten pool at the welding bead position realizes full-wall thickness molten pool formation and is fixed through the liquid bridge, and realizes the maximum improvement of the integral welding strength.
Drawings
FIG. 1 is a cross-sectional view of a composite welding process for a vinylidene fluoride cracking furnace tube according to the present invention;
FIG. 2 is a schematic view showing a welding state in embodiment 1 of the present invention;
FIG. 3 is a schematic view showing a state of completion of one welding in embodiment 2 of the present invention;
FIG. 4 is a schematic view showing a state before welding in embodiment 3 of the present invention;
FIG. 5 is a schematic view showing a state after welding in embodiment 3 of the present invention;
1. a vinylidene fluoride cracking furnace tube; 2. chamfering; 3. auxiliary welding wires; 4. primary welding spots; 5. and (5) secondary welding.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a welding method of a vinylidene fluoride cracking furnace tube comprises the following steps:
s1, preparing two vinylidene fluoride cracking furnace tubes required by welding, and grinding and chamfering the welded junctions at the outer sides.
And S2, performing primary welding on one side of the chamfer angle at a speed of 250-350 mm/min by a laser heat conduction welding mode with the power density of less than 10-10W/cm.
And S3, bundling auxiliary welding wires on the surface of the primary welding position, filling the chamfer position, and performing secondary welding.
And S4, carrying out deep fusion welding by laser with the power density larger than 10-10W/cm during secondary welding, and continuously welding the auxiliary welding wire at the welding speed of 250-350 mm/min until the welding surface forms a reticular crystal structure layer.
The time interval between the secondary welding and the primary welding is based on that the surface temperature of the workpiece after the primary welding is reduced to be less than or equal to 80 ℃. The temperature is reduced to 80 ℃ during welding, so that the whole stability of the welding process can be stabilized and then secondary welding is carried out, and the welding craters are prevented from being secondarily heated for direct stabilization, so that the welding craters are separated from the welding state in sequence.
The auxiliary welding wire is an Inconel600 solid solution strengthening alloy material containing 70% -80% of NI. By arranging the auxiliary welding wire, the auxiliary welding wire is made of the Inconel600 solid solution strengthening alloy with high NI content, so that when the auxiliary welding wire is heated, the formation of a unit cell structure taking Ni element as a core is facilitated.
And after the primary welding is finished, carrying out induction heat treatment on the welding opening position. By arranging the induction heat treatment, after the primary welding, the stress in the induction heat treatment can be reduced, so that the influence of the internal stress is reduced in the secondary welding process.
Protective gas is inserted into both the primary welding and the secondary welding, and the protective gas comprises gas with the proportion of more than 60 percent of the total volume of one or more of carbon dioxide, argon, helium and nitrogen. Through setting up protective gas, protective gas can keep its welding state stable, makes it be difficult for appearing the desoldering and keep the welding bead more regular.
The width of the secondary welding channel is 3.4mm, and the thickness of the reticular crystal structure layer comprises 0.3-0.6 mm. Through setting up secondary welding, the welding bead of secondary welding is 3.4mm and makes its whole welding bead present lessly, can be under the cooperation of once welding, under its less welding bead effect, can keep darker molten bath and liquid bridge connection area.
The protective gas is high-heat airflow when being sprayed out, and the airflow flowing direction is opposite to the welding direction. The protective gas is high-heat airflow, so that the welding bead at the position before welding can be subjected to welding surface heating in advance to improve the stability of subsequent welding under the blowing of the airflow during welding, and the position after welding is subjected to heat preservation to a certain degree, so that the welding surface is maintained in a gradually-cooled state.
Example 2:
s1, preparing and welding the needed two vinylidene fluoride cracking furnace tubes, and polishing and chamfering the outer side of the welding port of the corresponding vinylidene fluoride cracking furnace tube on one side.
And S2, performing primary welding on one side of the chamfer angle at a speed of 250-350 mm/min by a laser heat conduction welding mode with the power density of less than 10-10W/cm.
And S3, bundling auxiliary welding wires on the surface of the primary welding position, filling the chamfer position, and performing secondary welding.
And S4, carrying out deep fusion welding by laser with the power density larger than 10-10W/cm during secondary welding, and continuously welding the auxiliary welding wire at the welding speed of 250-350 mm/min until the welding surface forms a reticular crystal structure layer.
Example 3:
s1, preparing two vinylidene fluoride cracking furnace tubes required by welding, and grinding and chamfering the welded junctions at the outer sides.
And S2, bundling auxiliary welding wires on the surface of the primary welding position, filling the chamfer position and welding.
And S3, continuously welding the auxiliary welding wire position at the welding speed of 250-350 mm/min through laser deep fusion welding with the power density of more than 10-10W/cm during welding until the welding surface forms a reticular crystal structure layer.
Example 4:
s1, preparing two vinylidene fluoride cracking furnace tubes required by welding, and grinding and chamfering the welded junctions at the outer sides.
And S2, performing primary welding on one side of the chamfer angle at a speed of 250-350 mm/min by a laser heat conduction welding mode with the power density of less than 10-10W/cm.
And S3, bundling auxiliary welding wires on the surface of the primary welding position, filling the chamfer position, and performing secondary welding.
And S4, carrying out deep fusion welding by laser with the power density larger than 10-10W/cm during secondary welding, and continuously welding the auxiliary welding wire at the welding speed of 250-350 mm/min until the welding surface forms a reticular crystal structure layer.
And S5, forming a reticular crystal structure layer on the welding surface of the secondary welding, cooling the reticular crystal structure layers on the two sides of the welding path to 80 ℃, matching with an auxiliary welding wire by adopting GMAW automatic surfacing welding, performing two-side extending and welding, forming a molten pool, and continuously mixing with the auxiliary welding wire to form a large-area reticular crystal structure layer.
By adopting the continuous surfacing welding mode on the two sides of the welding bead, a larger-area reticular crystal structure layer can be formed, and the whole body of the reticular crystal structure layer extends in a duct, so that the creep resistance of the vinylidene fluoride cracking furnace tube at high temperature is enhanced.
In conclusion, the present invention: by adopting the primary welding after chamfering, and the primary welding adopts a laser heat conduction welding mode and carries out a primary treatment process at a speed of 250-350 mm/min, the molten pool is in a state of shallow fusion depth under the conditions of slower welding speed and lower power, the deep position welding is carried out on the premise of not influencing the smoothness of the pipe wall, and then a secondary welding process is carried out under the action of an auxiliary welding wire, the chamfering position is flattened under the condition of supplementing the auxiliary welding wire, meanwhile, the two chamfering surfaces form a larger-area molten pool range, the molten pool is mixed with the melted auxiliary welding wire, the original structure is a columnar crystal structure, the welding layer is an equiaxed crystal structure, the combination part of the original structure and the welding layer is in a reticular crystal combination structure, and the welding firmness is greatly improved under the condition of keeping the outer wall surface more smooth, the overall tensile strength can be maintained at 600MPa or higher.
The points to be finally explained are: although the present invention has been described in detail with reference to the general description and the specific embodiments, on the basis of the present invention, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A welding method of a vinylidene fluoride cracking furnace tube is characterized by comprising the following steps:
s1, preparing two vinylidene fluoride cracking furnace tubes required by welding, and polishing and chamfering the welded junctions at the outer sides;
s2, performing primary welding on one side of the chamfer angle in a laser heat conduction welding mode with the power density of less than 10-10W/cm at the speed of 250-350 mm/min;
s3, bundling auxiliary welding wires on the surface of the primary welding position, filling the chamfer position, and performing secondary welding;
and S4, carrying out deep fusion welding by laser with the power density larger than 10-10W/cm during secondary welding, and continuously welding the auxiliary welding wire at the welding speed of 250-350 mm/min until the welding surface forms a reticular crystal structure layer.
2. The welding method of the vinylidene fluoride cracking furnace tube as claimed in claim 1, wherein: the time interval between the secondary welding and the primary welding is based on that the surface temperature of the workpiece after the primary welding is reduced to be less than or equal to 80 ℃.
3. The welding method of the vinylidene fluoride cracking furnace tube as claimed in claim 1, wherein: the auxiliary welding wire is an Inconel600 solid solution strengthening alloy material containing 70% -80% of NI.
4. The welding method of the vinylidene fluoride cracking furnace tube as claimed in claim 1, wherein: and after the primary welding is finished, carrying out induction heat treatment on the welding opening position.
5. The welding method of the vinylidene fluoride cracking furnace tube as claimed in claim 1, wherein: protective gas is inserted into both the primary welding and the secondary welding, and the protective gas comprises gas with the proportion of more than 60 percent of the total volume of one or more of carbon dioxide, argon, helium and nitrogen.
6. The welding method of the vinylidene fluoride cracking furnace tube as claimed in claim 1, wherein: the width of the secondary welding channel is 3.4mm, and the thickness of the reticular crystal structure layer comprises 0.3-0.6 mm.
7. The welding method of the vinylidene fluoride cracking furnace tube as claimed in claim 1, wherein: the protective gas is high-heat airflow when being sprayed out, and the airflow flowing direction is opposite to the welding direction.
8. The welding method of vinylidene fluoride cracking furnace tube according to any one of claims 1 to 7,
the method is characterized in that: and preparing the composite welding type vinylidene fluoride cracking furnace tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111655326.4A CN114310000A (en) | 2021-12-31 | 2021-12-31 | Composite welding type vinylidene fluoride cracking furnace tube and welding method thereof |
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| CN202111655326.4A CN114310000A (en) | 2021-12-31 | 2021-12-31 | Composite welding type vinylidene fluoride cracking furnace tube and welding method thereof |
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