CN114309897A - Longitudinal seam welding method for composite steel pipe and method for welding longitudinal seam of composite steel pipe by adopting strip surfacing - Google Patents
Longitudinal seam welding method for composite steel pipe and method for welding longitudinal seam of composite steel pipe by adopting strip surfacing Download PDFInfo
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- CN114309897A CN114309897A CN202111641492.9A CN202111641492A CN114309897A CN 114309897 A CN114309897 A CN 114309897A CN 202111641492 A CN202111641492 A CN 202111641492A CN 114309897 A CN114309897 A CN 114309897A
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- 238000003466 welding Methods 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims abstract description 66
- 239000002131 composite material Substances 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims description 26
- 238000003754 machining Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000012895 dilution Substances 0.000 abstract description 3
- 238000010790 dilution Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
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- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- BQJTUDIVKSVBDU-UHFFFAOYSA-L copper;sulfuric acid;sulfate Chemical compound [Cu+2].OS(O)(=O)=O.[O-]S([O-])(=O)=O BQJTUDIVKSVBDU-UHFFFAOYSA-L 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- ALKZAGKDWUSJED-UHFFFAOYSA-N dinuclear copper ion Chemical compound [Cu].[Cu] ALKZAGKDWUSJED-UHFFFAOYSA-N 0.000 description 1
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Abstract
In order to solve the problems that the problems of dilution, corrosion of welding seams, strength of welding seams and the like in the process of welding the longitudinal seams of the composite pipes in the prior art are difficult to meet the requirements of pipeline steel and the welding efficiency and the economy cannot be ensured, the invention adopts the technical scheme that: the method for welding the longitudinal seam of the composite steel pipe comprises the following steps: welding on the following welding grooves: the V-shaped groove and the V-shaped stepped groove are combined to form a welding groove, and the joint part is a truncated edge; the V-shaped stepped groove is divided into an inner groove and an outer groove according to the number of stepped stages, and the narrower part is the inner groove; the method comprises the following steps: and welding the V-shaped groove by adopting double-wire submerged arc welding, welding the inner groove by adopting single-wire submerged arc welding, and welding the outer groove by adopting stainless steel band electrode slag overlaying welding. Is suitable for the production and manufacture of oil and gas transmission composite pipelines.
Description
Technical Field
The invention belongs to the technical field of welding of oil and gas transmission composite pipes, and particularly relates to a welding process method of longitudinal seams between steel plates in the process of welding a composite steel plate into a steel pipe after being rolled.
Background
With the increasing world energy demand, the maintenance cost of oil, natural gas and other transportation pipelines needs to be reduced, the service life is prolonged, corrosion-resistant alloy and nickel-based alloy can be adopted, but the manufacturing cost is increased, and the resource is greatly wasted. A stainless steel composite pipe is characterized in that a stainless steel layer with the diameter of 1-3mm is added in the inner portion of the pipe diameter in a metallurgical mode on the basis of original pipeline steel, the stainless steel layer mainly has the function of resisting corrosion of media such as petroleum and natural gas, the service life of the pipeline is greatly prolonged, and in recent years, various domestic large manufacturing plants also develop the pipeline steel plate with the composite layer in succession.
Disclosure of Invention
In order to solve the problems that the dilution problem, the corrosion problem of the welding seam, the strength of the welding seam and the like in the process of welding the stainless steel composite layer in the longitudinal seam welding process of the composite pipe in the prior art are difficult to meet the requirements of pipeline steel and the welding efficiency and the economy can not be ensured, the invention adopts the technical scheme that:
the method for welding the longitudinal seam of the composite steel pipe adopts a strip surfacing welding mode, and specifically comprises the following steps:
welding on the following welding grooves:
the welding groove is as follows:
the welding groove is formed by combining a V-shaped groove and a V-shaped stepped groove, and the joint part of the V-shaped groove and the V-shaped stepped groove is a truncated edge;
the V-shaped stepped groove is divided into an inner groove and an outer groove according to the number of the stepped stages, the narrower part is the inner groove, and the other part is the outer groove;
the method comprises the following steps:
welding the V-shaped groove by adopting double-wire submerged arc welding;
welding the inner groove by adopting single-wire submerged-arc welding;
and welding the outer groove by adopting stainless steel band electrode slag overlaying welding.
Further, the V-groove is specifically:
the angle of the V-shaped groove is 75-105 degrees.
Further, the V-shaped stepped groove specifically comprises:
the angle of the V-shaped step groove is 75-105 degrees, the length of the step of the step groove is 3-5mm, the height of the step groove is 3-5mm, and the angle of the step groove is 45-60 degrees.
Further, the thickness of the blunt edge is 2.5 mm.
Further, in the step of welding the outer groove:
the welding strip with the specification of 0.4 multiplied by 30mm is adopted, and the surfacing speed is 250-300 mm/min.
Based on the same inventive concept, the application also provides a method for welding the longitudinal joint of the composite steel pipe by adopting strip surfacing, and the method comprises the following steps:
a processing step of processing a welding groove;
the processing steps are as follows:
processing an outer welding seam on the outer side of the position to be welded, wherein the outer welding seam is a V-shaped groove,
processing an inner welding seam on the inner side of a position to be welded, wherein the processing process of the inner welding seam comprises the following steps: firstly, processing a V-shaped groove, and then processing a V-shaped stepped groove on the V-shaped groove, wherein the narrower part of the V-shaped stepped groove is an inner groove, and the other part of the V-shaped stepped groove is an outer groove;
finally, machining the middle of the welding groove into a truncated edge;
the method further comprises the following steps:
adopting the steps of the longitudinal seam welding method of the composite steel pipe.
Further, the outer weld specifically is as follows:
the angle of the V-shaped groove is 75-105 degrees.
Further, the inner weld specifically comprises:
the angle of the V-shaped step groove is 75-105 degrees, the length of the step of the step groove is 3-5mm, the height of the step of the step groove is 3-5mm, and the angle of the step of the step groove is 45-60 degrees.
Further, the thickness of the truncated edge is 1.5-3.5 mm.
Further, the outer groove welding step specifically comprises:
the welding strip with the specification of 0.4 multiplied by 30mm is adopted, and the surfacing speed is 250-300 mm/min.
The invention has the advantages that:
the welding method provided by the invention overcomes the prejudice of the prior art, in the prior art, strip surfacing is suitable for the inner wall surfacing of the container, and if the strip surfacing is applied to groove welding, the key technical problems of poor fusion, slag inclusion and the like are encountered, so that the problems of poor welding effect, low efficiency, insufficient strength of the welded pipe and the like are caused; therefore, the welding method is generally considered to be unsuitable for being applied to groove welding; the welding method provided by the invention adopts a mode of designing the groove into the V-shaped groove and the V-shaped stepped groove, and solves the problems of the defects caused by shallow molten depth and groove limitation in the process of adopting strip surfacing in the traditional mode.
The welding method provided by the invention adopts a 90-degree V-shaped port and step groove combined form, effectively solves the technical problem of the strip surfacing method in the manufacturing process of the composite steel pipe, realizes the welding of the longitudinal seam of the inner wall of the steel pipe, effectively solves the problems of poor dilution rate and corrosion resistance of a composite layer material and a carbon steel material at a three-phase intersection, avoids the technical problem that the strip surfacing method is easy to have the defects of incomplete fusion, slag inclusion and the like in the welding seam, and realizes the production, the manufacture and the application of products.
The welding method provided by the invention introduces the strip surfacing method on the longitudinal joint of the welded composite pipe for the first time, greatly improves the production efficiency, adopts one-time strip surfacing welding for completing the step groove, shortens the manufacturing period and improves the efficiency by more than 20%.
The composite pipe welded by the welding method provided by the invention realizes the application of a strip surfacing technology in the field of composite pipe manufacturing, the welding process has stable technological performance and performance, the welding bead is attractive in shape, and compared with the traditional welding wire welding, the welding is completed in one step, the surfacing efficiency is greatly improved, the bad defects of undercut, incomplete fusion and the like are avoided, the production and manufacturing period of the composite steel pipe is shortened, and the interactive fusion of a new technology in different fields is promoted.
The groove design and the welding process method provided by the invention are suitable for welding stainless steel with various pipe diameters. Has wide adaptability.
Is suitable for the production and manufacture of oil and gas transmission composite pipelines.
Drawings
Fig. 1 is a schematic cross-sectional view of a welding groove according to a first embodiment;
fig. 2 is a schematic cross-sectional view of a welding groove having an angle of 45 ° in the step mentioned in the third embodiment;
fig. 3 is a schematic cross-sectional view of a welding groove having an angle of 60 ° in the step mentioned in the third embodiment;
FIG. 4 is a diagram of an actually photographed weld joint macro-topography effect;
fig. 5 is a longitudinal seam welding effect diagram actually photographed.
Detailed Description
In order to make the advantages and benefits of the solutions provided by the present invention clearer, several embodiments of the solutions provided by the present application will now be described in detail with reference to the accompanying drawings, but the embodiments described below are only some preferred embodiments of the solutions and are not intended to be limiting on the solutions.
The first embodiment is described with reference to fig. 1 to 3, and the first embodiment provides a method for welding a longitudinal seam of a composite steel pipe by using a strip surfacing welding method, which specifically comprises the following steps:
welding on the following welding grooves:
the welding groove is as follows:
the welding groove is formed by combining a V-shaped groove and a V-shaped stepped groove, and the joint part of the V-shaped groove and the V-shaped stepped groove is a truncated edge;
the V-shaped stepped groove is divided into an inner groove and an outer groove according to the number of the stepped stages, the narrower part is the inner groove, and the other part is the outer groove;
the method comprises the following steps:
welding the V-shaped groove by adopting double-wire submerged arc welding;
welding the inner groove by adopting single-wire submerged-arc welding;
and welding the outer groove by adopting stainless steel band electrode slag overlaying welding.
In the second embodiment, the present embodiment is described with reference to fig. 1 to 3, and the present embodiment further defines the longitudinal seam welding method for a composite steel pipe provided in the first embodiment, and the V-groove specifically includes:
the angle of the V-shaped groove is 75-105 degrees.
In a third embodiment, the present embodiment is described with reference to fig. 1 to 3, and the present embodiment further defines the longitudinal seam welding method for a composite steel pipe provided in the first embodiment, and the V-shaped step groove specifically includes:
the angle of the V-shaped step groove is 75-105 degrees, the length of the step of the step groove is 3-5mm, the height of the step groove is 3-5mm, and the angle of the step groove is 45-60 degrees.
Wherein, the step of the step groove can be processed in a linear or arc transition mode, specifically as shown in fig. 1-3, fig. 1 is a schematic cross-sectional view of a welding groove designed in a linear mode, wherein the angle of the step is 45 degrees; FIG. 2 is a schematic cross-sectional view of a welding groove designed in such a manner that the angle of a step is 45 degrees and the step adopts an arc transition manner; FIG. 3 is a schematic cross-sectional view of a welding groove designed in such a manner that the angle of a step is 60 degrees and the step adopts an arc transition manner;
in the fourth embodiment, the present embodiment is described with reference to fig. 1 to 3, and the present embodiment further defines the longitudinal seam welding method for a composite steel pipe according to the first embodiment, wherein the thickness of the truncated edge is 1.5 to 3.5 mm.
Fifth embodiment, the present embodiment is described with reference to fig. 1 to 3, and the present embodiment is a further limitation of the longitudinal seam welding method for a composite steel pipe according to the first embodiment, wherein in the outer-groove welding step:
the welding strip with the specification of 0.4 multiplied by 30mm is adopted, and the surfacing speed is 250-300 mm/min.
Sixth embodiment, the present embodiment is described with reference to fig. 1 to 3, and the present embodiment provides a method for welding a longitudinal seam of a clad steel pipe by strip overlay welding, the method including:
a processing step of processing a welding groove;
the processing steps are as follows:
processing an outer welding seam on the outer side of the position to be welded, wherein the outer welding seam is a V-shaped groove,
processing an inner welding seam on the inner side of a position to be welded, wherein the processing process of the inner welding seam comprises the following steps: firstly, processing a V-shaped groove, and then processing a V-shaped stepped groove on the V-shaped groove, wherein the narrower part of the V-shaped stepped groove is an inner groove, and the other part of the V-shaped stepped groove is an outer groove;
finally, machining the middle of the welding groove into a truncated edge;
the method further comprises the following steps:
the method for welding the longitudinal seam of the composite steel pipe according to claim 1.
A seventh embodiment is described with reference to fig. 1 to 3, and the present embodiment is further limited to the method for welding a longitudinal seam of a clad steel pipe by strip overlay welding according to the sixth embodiment, wherein the outer bead specifically includes:
the angle of the V-shaped groove is 75-105 degrees.
An eighth embodiment is described with reference to fig. 1 to 3, and the present embodiment is further limited to the method for welding a longitudinal seam of a clad steel pipe by strip overlay welding according to the sixth embodiment, wherein the inner bead specifically includes:
the angle of the V-shaped step groove is 75-105 degrees, the length of the step of the step groove is 3-5mm, the height of the step of the step groove is 3-5mm, and the angle of the step of the step groove is 45-60 degrees.
Ninth embodiment, the present embodiment is described with reference to fig. 1 to 3, and the present embodiment is further limited to the method of welding the longitudinal seam of the clad steel pipe by strip overlay welding according to the sixth embodiment, wherein the thickness of the truncated edge is 1.5 to 3.5 mm.
Embodiment ten and the present embodiment will be described with reference to fig. 1 to 3, and the present embodiment is a further limitation of the method for welding a longitudinal seam of a clad steel pipe by strip overlay welding according to embodiment six, wherein in the outer-groove welding step:
the welding strip with the specification of 0.4 multiplied by 30mm is adopted, and the surfacing speed is 250-300 mm/min.
The eleventh embodiment is described with reference to fig. 1 to 5, and the present embodiment provides a specific example for the method for welding the longitudinal seam of the composite steel pipe by using the step-back welding in the sixth embodiment, specifically:
processing a stainless steel composite pipe with specification phi 508 (17+ 3); the X65 steel grade of the base layer is 17mm, and the material of the multi-layer 316 is 3 mm.
Firstly, processing a groove: machining the stainless steel composite plate into a double-sided groove by adopting a machining mode, wherein the groove of an outer welding seam is 90 degrees, the groove of an inner welding seam is machined into a 90-degree V-shaped opening and a step groove, the height of the step groove is 4mm and is slightly larger than a stainless steel 3mm double layer, the truncated edge is 2.5mm, and the width of the groove is 28 mm; wherein the step groove adopts circular arc transition, the step adopts 45 degrees, and the section of the groove structure is shown in figure 2;
the welding process comprises the following steps: the 90-degree V-shaped groove of the outer welding seam is welded by adopting wire submerged arc welding SAW, the 90-degree V groove of the inner welding seam is welded by adopting wire submerged arc welding, the step groove adopts strip surfacing, the specification of a welding strip is 0.4 multiplied by 30mm, the surfacing speed is 300mm/min, and the high-speed surfacing is completed at one time.
Wherein, the welding strip model is: EQ309 LMo; the welding parameters are as follows: the welding current is 400mm/min, and the welding voltage is 26V.
And (3) detecting welding manufacturability: as shown in FIGS. 4-5, the slag detachability of the weld and the weld surface formation are good, and defects such as unfused, slag inclusion, undercut and the like are avoided as can be seen from FIGS. 4-5.
And (3) testing the corrosion performance of the welding seam:
according to ASTM A262E method copper-copper sulfate-16% sulfuric acid test for susceptibility to intergranular corrosion of austenitic stainless steels, intergranular corrosion tests were conducted and no intergranular corrosion tendency was observed.
An intergranular corrosion test is carried out according to GB/T4334.5 method stainless steel sulfuric acid-copper sulfate corrosion test method, and no intergranular corrosion tendency is found.
The above-described embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, improvements, combinations, equivalents, and the like based on the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The method for welding the longitudinal seam of the composite steel pipe adopts a strip surfacing welding mode and is characterized by comprising the following steps of:
welding on the following welding grooves:
the welding groove is as follows:
the welding groove is formed by combining a V-shaped groove and a V-shaped stepped groove, and the joint part of the V-shaped groove and the V-shaped stepped groove is a truncated edge;
the V-shaped stepped groove is divided into an inner groove and an outer groove according to the number of the stepped stages, the narrower part is the inner groove, and the other part is the outer groove;
the method comprises the following steps:
welding the V-shaped groove by adopting double-wire submerged arc welding;
welding the inner groove by adopting single-wire submerged-arc welding;
and welding the outer groove by adopting stainless steel band electrode slag overlaying welding.
2. The longitudinal seam welding method of the composite steel pipe according to claim 1, wherein the V-shaped groove is specifically:
the angle of the V-shaped groove is 75-105 degrees.
3. The longitudinal seam welding method of the composite steel pipe according to claim 1, wherein the V-shaped stepped groove is specifically:
the angle of the V-shaped step groove is 75-105 degrees, the length of the step of the step groove is 3-5mm, the height of the step groove is 3-5mm, and the angle of the step groove is 45-60 degrees.
4. The longitudinal seam welding method of the composite steel pipe as claimed in claim 1, wherein the thickness of the truncated edge is 1.5-3.5 mm.
5. The method for welding the longitudinal seam of the composite steel pipe as claimed in claim 1, wherein the step of welding the outer groove comprises:
the welding strip with the specification of 0.4 multiplied by 30mm is adopted, and the surfacing speed is 250-300 mm/min.
6. The method for welding the longitudinal seam of the composite steel pipe by adopting strip surfacing is characterized by comprising the following steps of:
a processing step of processing a welding groove;
the processing steps are as follows:
processing an outer welding seam on the outer side of the position to be welded, wherein the outer welding seam is a V-shaped groove,
processing an inner welding seam on the inner side of a position to be welded, wherein the processing process of the inner welding seam comprises the following steps: firstly, processing a V-shaped groove, and then processing a V-shaped stepped groove on the V-shaped groove, wherein the narrower part of the V-shaped stepped groove is an inner groove, and the other part of the V-shaped stepped groove is an outer groove;
finally, machining the middle of the welding groove into a truncated edge;
the method further comprises the following steps:
the method for welding the longitudinal seam of the composite steel pipe according to claim 1.
7. The method for welding the longitudinal joint of the composite steel pipe by adopting strip surfacing welding according to claim 6, wherein the outer welding seam is characterized by comprising the following steps of:
the angle of the V-shaped groove is 75-105 degrees.
8. The method for welding the longitudinal joint of the composite steel pipe by adopting strip surfacing welding according to claim 6, wherein the inner welding seam is characterized by comprising the following steps of:
the angle of the V-shaped step groove is 75-105 degrees, the length of the step of the step groove is 3-5mm, the height of the step of the step groove is 3-5mm, and the angle of the step of the step groove is 45-60 degrees.
9. The method for welding the longitudinal seam of the composite steel pipe by using strip surfacing welding according to claim 6, wherein the thickness of the truncated edge is 1.5-3.5 mm.
10. The method for welding the longitudinal joint of the composite steel pipe by adopting strip surfacing welding according to claim 6, wherein in the step of welding the outer slope, the step of welding the outer slope comprises the following steps:
the welding strip with the specification of 0.4 multiplied by 30mm is adopted, and the surfacing speed is 250-300 mm/min.
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