CN108994430B - Welding method of nickel-based alloy steel and carbon steel dissimilar material pipeline - Google Patents
Welding method of nickel-based alloy steel and carbon steel dissimilar material pipeline Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 273
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 49
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 26
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 26
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 24
- 239000010962 carbon steel Substances 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 title claims abstract description 12
- 230000004927 fusion Effects 0.000 claims abstract description 23
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 239000011324 bead Substances 0.000 claims description 13
- 210000001503 joint Anatomy 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 230000035515 penetration Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 11
- 230000007547 defect Effects 0.000 description 7
- 239000002893 slag Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 2
- CFQGDIWRTHFZMQ-UHFFFAOYSA-N argon helium Chemical compound [He].[Ar] CFQGDIWRTHFZMQ-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- IADRPEYPEFONML-UHFFFAOYSA-N [Ce].[W] Chemical compound [Ce].[W] IADRPEYPEFONML-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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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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Abstract
The invention belongs to the technical field of dissimilar steel welding, and particularly relates to a welding method of a nickel-based alloy steel and carbon steel dissimilar material pipeline. The invention provides a method for welding a nickel-based alloy steel and carbon steel dissimilar material pipeline, and aims to solve the problem that when the nickel-based alloy steel and the carbon steel with small pipe diameter and large pipe wall are subjected to pipeline assembly welding, a bulge with the thickness of more than 0.45mm exists on the back surface of a welding line. The welding method comprises the following steps: step S1, carrying out pairing between pipelines to be welded, controlling a pairing gap to be 0-1 mm, and filling protective gas into the back of a pairing groove; step S2, backing welding the pipelines in group; step S3, filling and welding the pipelines by group; in step S4, the facing between the pipes is welded. In the method, the sectional fusion welding is adopted for backing welding, and the welding parameters are adaptively adjusted, so that the distribution of heat input quantity in the backing welding is controlled, and the projection of the back surface of the welding line is controlled within 0.45 mm.
Description
Technical Field
The invention belongs to the technical field of dissimilar steel welding, and particularly relates to a welding method of a nickel-based alloy steel and carbon steel dissimilar material pipeline.
Background
The high temperature gas cooled reactor is a fourth generation nuclear reactor type with good safety characteristics. The heat transfer pipe is a key component of a steam generator of the high-temperature gas cooled reactor, plays a role in carrying fluid and directly exchanging heat, and has a great influence on the performance, safety and reliability of the whole high-temperature gas cooled reactor.
At present, when an Incoloy800H nickel-based alloy steel with the outer diameter of 19mm and the wall thickness of 3mm and a T22 carbon steel dissimilar material pipeline are adopted for welding in a heat transfer pipe, the welding performance of the Incoloy800H nickel-based alloy steel is poor, and the Incoloy800H nickel-based alloy steel is subjected to assembly welding aiming at the dissimilar material pipeline with the small pipe diameter and the large pipe wall, the bulge phenomenon that the inner surface of a welding seam is higher than 0.45mm is easily generated after the welding is completed, the standard requirement that the bulge of the inner wall is not more than 0.45mm of the inner surface can not be met, the quality and the performance of a welding joint of the heat transfer pipe are influenced, and the smooth proceeding of the.
Disclosure of Invention
The invention provides a method for welding a dissimilar material pipeline of nickel-based alloy steel and carbon steel, and aims to solve the problem that when the Incoloy800H nickel-based alloy steel and the T22 carbon steel with small pipe diameters and large pipe walls are subjected to pipeline assembly welding, a bulge with the thickness of more than 0.45mm exists on the back surface of a welded seam. The welding method comprises the following steps:
step S1, carrying out pairing between pipelines to be welded, controlling a pairing gap to be 0-1 mm, and filling protective gas into the back of a pairing groove;
step S2, backing welding the pipelines in group; carrying out segmented fusion welding on the truncated edge of the groove along the circumferential direction to form a penetration weld bead, and gradually reducing welding current in the whole fusion welding process;
step S3, filling and welding the pipelines by group; after backing welding is finished, filling welding is carried out on the backing weld bead until the filling welding on the whole circumference is finished;
step S4, performing cover surface welding between the paired pipelines; and after the filling welding is finished, performing one or more cap welding processes to form a cap welding bead until the whole welding operation is finished.
Preferably, in step S1, a single V-shaped groove is used between the pipes to be welded, and the single slope of the groove is 15 ° to 25 °.
Preferably, in the step S1, after completing the assembly of the pipes to be welded, a plurality of fixing points are provided between the assembly gaps to fix the positions of the pipes.
Further preferably, in step S1, 3 fixed points are set between the pair-pairing gaps of the pair-paired pipes, respectively at the 0 °, 135 ° and 225 ° positions of the butt joint.
Preferably, in the step S2, the fusion welding is performed in four sections, namely, a 0-90 ° section, a 90-180 ° section, a 180-270 ° section, and a 270-0 ° section in the butt joint; wherein,
fusion welding is carried out between 0 and 90 degrees, the peak value range of welding current is 95 to 115A, the base value range is 42 to 62A, the peak value time is 0.20 to 0.26s, and the base value time is 0.36 to 0.42 s; melting welding at 90-180 degrees, wherein the peak value range of welding current is 88-108A, the base value range is 39-59A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s; melting welding at 180-270 degrees, wherein the peak value range of welding current is 83-103A, the base value range is 36-56A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s; and (3) melting welding between 270 and 0 degrees, wherein the peak value range of welding current is 82-102A, the base value range is 36-56A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s.
More preferably, in the four-stage fusion welding process, when the peak value and the base value of the welding current are concomitantly adjusted in stages, the welding current value is reduced by 1 to 5A after each stage of adjustment.
Preferably, in the step S3, the segmented filling welding is adopted, and the welding current is gradually reduced in the whole filling welding process.
More preferably, in step S3, filling welding is performed in four sections, namely, a 45 ° section to 135 ° section, a 135 ° section to 225 ° section, a 225 ° section to 315 ° section, and a 315 ° section to 45 ° section in the butt joint; wherein,
filling and welding at 45-135 degrees, wherein the peak value range of welding current is 86-106A, the base value range is 33-53A, the voltage range is 9.0-10.0V, the welding speed is 63-67 mm/min, and the wire feeding speed is 325-335 mm/min; filling welding at 135-225 degrees, wherein the peak value range of welding current is 82-102A, the base value range is 28-48A, the voltage range is 8.7-9.7V, the welding speed is 63-67 mm/min, and the wire feeding speed is 325-335 mm/min; filling and welding between 225 and 315 degrees, wherein the peak value range of welding current is 79-99A, the base value range is 28-48A, the voltage range is 8.5-9.5V, the welding speed is 63-67 mm/min, and the wire feeding speed is 325-335 mm/min; and (3) filling welding between 315 and 45 degrees, wherein the peak value range of welding current is 76 to 96A, the base value range is 26 to 46A, the voltage range is 8.5 to 9.5V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 325 to 335 mm/min.
Preferably, in step S4, segmented facing welding is used, and the welding current is gradually reduced throughout the facing welding process.
More preferably, in step S4, the cover surface welding is performed in four sections, which are a 315 ° section to 45 °, a 45 ° section to 135 °, a 135 ° section to 225 ° section, and a 225 ° section in the butt joint, respectively; wherein,
welding the cover surface between 315 and 45 degrees, wherein the peak value range of welding current is 88 to 108A, the base value range is 35 to 55A, the voltage range is 8.6 to 9.7V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 315 to 325 mm/min; the welding is carried out on the cover surface between 45 degrees and 135 degrees, the peak value range of the welding current is 85-105A, the base value range is 32-52A, the voltage range is 8.5-9.5V, the welding speed is 63-67 mm/min, and the wire feeding speed is 315-325 mm/min; the welding is carried out on the cover surface between 135 and 225 degrees, the peak value range of the welding current is 83 to 103A, the base value range is 33 to 53A, the voltage range is 8.5 to 9.5V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 315 to 325 mm/min; and (3) cover surface welding between 225 and 315 degrees, wherein the peak value range of welding current is 82-102A, the base value range is 30-50A, the voltage range is 8.7-9.7V, the welding speed is 63-67 mm/min, and the wire feeding speed is 315-325 mm/min.
By adopting the welding method of the nickel-based alloy steel and the carbon steel dissimilar material pipeline, the Incoloy800H nickel-based alloy steel with the outer diameter of 19mm and the wall thickness of 3mm and the T22 carbon steel dissimilar material pipeline are assembled and welded, and the welding method has the following beneficial effects:
1. when the method is adopted, the backing welding in the whole circumferential direction is performed by segmented fusion welding, and welding parameters are adaptively adjusted along with the welding, so that the distribution of heat input quantity in the whole backing welding process is controlled, and welding molten drops generated in the welding process reach the balance of the gravity borne by the welding molten drops and the blunt edge supporting force borne by the groove, so that the back surface projection quantity of the welding seam is effectively controlled under the condition of ensuring the quality of the welding seam between the nickel-based alloy steel pipeline with small pipe diameter and large wall thickness and the carbon steel pipeline, the standard requirement that the projection height is lower than 4.5mm is met, the quality and performance requirements of a heat transfer pipe welding joint are met, and the smooth progress of the whole construction progress is ensured.
2. In the method, the filling welding and the cover surface welding in the whole circumferential direction are respectively in sectional type welding, and the welding parameters and the welding arc starting positions in different areas are correspondingly adjusted and controlled, so that the effect on the backing weld bead in the filling welding and the cover surface welding processes is accurately controlled, the phenomenon that the backing weld bead generates excessive acting force to form the invagination of the weld bead is avoided, and the quality of the final weld bead is further ensured.
Drawings
FIG. 1 is a schematic flow chart of assembly welding of Incoloy800H nickel-based alloy steel pipes and T22 carbon steel pipes by using the method of the invention;
FIG. 2 is a schematic view of the assembly between pipes to be welded in the method of the present invention;
FIG. 3 is a schematic view of the distribution of points in a pairing gap in the method of the present invention;
FIG. 4 is a schematic view of a welding sequence for a segmented backing weld performed in the method of the present invention;
FIG. 5 is a schematic view of a welding sequence for performing a step-fill weld in the method of the present invention;
fig. 6 is a schematic view of a welding sequence when performing segmented facing welding in the method of the invention.
Detailed Description
The technical scheme of the invention is described in detail in the following with reference to the accompanying drawings
Referring to fig. 1, when the welding method of the nickel-based alloy steel and carbon steel dissimilar material pipeline of the invention is used for butt welding an Incoloy800H nickel-based alloy steel pipeline and a T22 carbon steel pipeline with the outer diameter dimension of 19mm, the wall thickness of 3mm and the groove truncated edge thickness of 0.5mm, the specific operation steps are as follows:
and step S1, carrying out pairing between the pipelines to be welded, controlling the pairing gap to be 0-1 mm, and filling protective gas into the back of the pairing groove.
And (3) combining the Incoloy800H nickel-based alloy steel pipe and the T22 carbon steel pipe in opposite pairing mode to form a single V-shaped groove, wherein the single slope of the groove is 20 degrees, and the pairing gap in the whole circumferential direction is controlled to be 0-1 mm.
Preferably, after the Incoloy800H nickel-based alloy steel pipe and the T22 carbon steel pipe are assembled, a plurality of point fixing points can be arranged between assembly gaps and used for fixing the position relation between the Incoloy800H nickel-based alloy steel pipe and the T22 carbon steel pipe, so that the stability of the assembly gaps is guaranteed, and the quality and the effect of later-stage welding are guaranteed.
As shown in fig. 3, three point fixing points are arranged along the circumferential direction of the paired gaps, namely a first point fixing point 1 located at 0 ° of the butt joint, a second point fixing point 2 located at 135 ° of the butt joint, and a third point fixing point 3 located at 225 ° of the pipeline to be welded. Through carrying out the symmetry setting with three point fixed points in whole circumference to guarantee to treat welded pipe and carry out the evenly distributed of effort when spot welding is fixed, guarantee to treat welded pipe fixed connection's stability. Similarly, a larger number of point fixing points can be arranged at other positions according to the diameter size, the group gap size and the groove size of the pipeline to be welded, so that the stability of fixing the pipeline to be welded is ensured.
In addition, as the back protective gas for the group to the groove, argon-helium mixed gas with the volume ratio of 3:7 can be adopted to protect the back of the groove in the welding process, and also pure argon can be selected as the back protective gas according to the condition of a construction site and the welding requirement.
And step S2, backing welding the pipelines by group. The truncated edge of the groove is subjected to sectional fusion welding to form a penetration weld bead, welding current is gradually reduced in the whole fusion welding process, and the distribution condition of heat input in the whole backing welding process is effectively controlled, so that the gravity and the supporting force borne by a molten pool are balanced, and the size of the projection on the back of the weld joint is controlled.
Preferably, the backing fusion weld is performed in a segmented fashion. Referring to fig. 4, the assembly gap is divided into a 0-90 degree section, a 90-180 degree section, a 180-270 degree section and a 270-0 degree section along the circumferential direction, and the backing weld on the whole circumference is completed by welding according to the division sequence.
Wherein, in the fusion welding between 0 DEG and 90 DEG, the peak value range of the welding current is 95-115A, the base value range is 42-62A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s. In the fusion welding between 90 DEG and 180 DEG, the peak value range of the welding current is 88 to 108A, the base value range is 39 to 59A, the peak value time is 0.20 to 0.26s, and the base value time is 0.36 to 0.42 s. In the fusion welding between 180 DEG and 270 DEG, the peak value range of welding current is 83-103A, the base value range is 36-56A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s. In the fusion welding between 270 DEG and 0 DEG, the peak value range of the welding current is 82-102A, the base value range is 36-56A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s.
Preferably, in the four-stage fusion welding process, when the peak value and the base value of the welding current are adjusted concomitantly in sections, the welding current value is reduced by 1-5A after each section of adjustment, so that the heat input quantity in each section of welding is optimally and reasonably distributed, and the forming quality of the welding seam in the whole circumferential direction is ensured. Similarly, when the nickel-based alloy steel and the carbon steel with other diameter sizes and wall thickness sizes are subjected to group butt welding, the number of the sectional welding and the magnitude relation between the current values of different welding positions and the current values of different sections can be adjusted according to specific conditions, so that the optimal welding seam forming effect for welding pipelines with different sizes is achieved.
And step S3, filling and welding the pipelines by group. After the backing welding in step S2 is completed, filler welding is performed on the backing bead until the filler welding in the entire circumferential direction is completed.
Preferably, the fill welding is performed in stages, and the welding current is gradually reduced throughout the fill welding process. As shown in fig. 5, the pair-fitting gap is divided into a 45 ° to 135 ° section, a 135 ° to 225 ° section, a 225 ° to 315 ° section, and a 315 ° to 45 ° section in the circumferential direction, and the filling welding on the entire circumference is completed by welding in this order.
Wherein, in the filling welding between 45 degrees and 135 degrees, the peak value range of the welding current is 86-106A, the base value range is 33-53A, the voltage range is 9.0-10.0V, the welding speed is 63-67 mm/min, and the wire feeding speed is 325-335 mm/min. In filling welding between 135 and 225 degrees, the peak value range of welding current is 82-102A, the base value range is 28-48A, the voltage range is 8.7-9.7V, the welding speed is 63-67 mm/min, and the wire feeding speed is 325-335 mm/min. In filling welding between 225 and 315 degrees, the peak value range of welding current is 79 to 99A, the base value range is 28 to 48A, the voltage range is 8.5 to 9.5V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 325 to 335 mm/min. In filling welding between 315 and 45 degrees, the peak value range of welding current is 76 to 96A, the base value range is 26 to 46A, the voltage range is 8.5 to 9.5V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 325 to 335 mm/min.
In step S4, the facing between the pipes is welded. And after the filling welding is finished, performing one or more cap welding processes to form a cap welding bead until the whole welding operation is finished.
Preferably, the facing welding is performed in stages, and the welding current is gradually reduced throughout the facing welding process. As shown in fig. 6, the pair-fitting gap is divided into 315 ° to 45 ° sections, 45 ° to 135 ° sections, 135 ° to 225 ° sections, and 225 ° to 315 ° sections in the circumferential direction, and welding is performed in this order to complete the cover surface welding on the entire circumference.
In the cover surface welding between 315 degrees and 45 degrees, the peak value range of welding current is 88-108A, the base value range is 35-55A, the voltage range is 8.6-9.7V, the welding speed is 63-67 mm/min, and the wire feeding speed is 315-325 mm/min. In the cover surface welding between 45 degrees and 135 degrees, the peak value range of welding current is 85-105A, the base value range is 32-52A, the voltage range is 8.5-9.5V, the welding speed is 63-67 mm/min, and the wire feeding speed is 315-325 mm/min. In the cover surface welding between 135 degrees and 225 degrees, the peak value range of welding current is 83-103A, the base value range is 33-53A, the voltage range is 8.5-9.5V, the welding speed is 63-67 mm/min, and the wire feeding speed is 315-325 mm/min. In the cover surface welding between 225 and 315 degrees, the peak value range of welding current is 82 to 102A, the base value range is 30 to 50A, the voltage range is 8.7 to 9.7V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 315 to 325 mm/min.
The following examples and comparative examples are combined to further compare the effects of the technical scheme of the invention
Example one
Firstly, V-shaped groove machining with 20-degree unilateral gradient is carried out on an Incoloy800H nickel-based alloy steel pipe and a T22 carbon steel pipe which are located at a 2G position and have the outer diameter size of 19mm, the wall thickness of 3mm and the groove blunt edge thickness of 0.5mm, two sections of pipes are paired, and the pairing gap in the circumferential direction is controlled to be 0-1 mm. And then, three point-fixed points are arranged between the pairing gaps to fix the positions of the pairing pipelines, the three point-fixed points are respectively positioned at three positions of 0 degree, 135 degrees and 225 degrees in the circumferential direction, and meanwhile, argon-helium mixed gas with the volume ratio of 3:7 is filled into the back of the pairing groove to serve as back protection gas. Then, backing welding, filling welding and cover welding were sequentially performed on the pair of pipes using the welding parameters shown in table 1. The method comprises the steps of selecting a PS406 full-position automatic welding machine of the French PolySoude company, configuring a closed machine head and a clamp type machine head for the machine head, and respectively using for bottoming welding and filling cover surface welding, wherein the tungsten electrode adopts a polished cerium tungsten electrode, the diameter of the tungsten electrode is 2.0mm, the taper is 30 degrees, the diameter of a platform is 0-0.8 mm, an ERNiCr-3 welding wire is selected as the welding wire, the diameter of the welding wire is 0.8mm, and argon with the purity of 99.99% is selected as welding protective gas.
TABLE 1
After all the welds were completed, the welded joint obtained in the first example was subjected to a test. Wherein, the front and the back of the welding seam have no defects of cracks, air holes, undercut, unfused and slag inclusion, and the like, and the inside of the welding seam has no defects of exceeding standards such as cracks, slag inclusion, air holes and the like, and meets the requirement of mechanical property. Meanwhile, a ball passing test is carried out by utilizing a ball passing with the outer diameter of 12.1mm, and the test ball passing can smoothly pass through the back welding seam, so that the standard requirement that the bulge of the back of the welding seam is lower than 0.45mm is met.
Example two
The Incoloy800H nickel-based alloy steel pipe and the T22 carbon steel pipe with the outer diameter of 19mm, the wall thickness of 3mm and the groove truncated edge thickness of 0.5mm are subjected to butt welding by the same method as the first embodiment, and the difference is that: the pipe to be welded was in the 5G position and the backing weld, fill weld and cap weld were respectively made using the weld parameters shown in table 2.
TABLE 2
After all the welds were completed, the welded joints obtained in example two were subjected to a test. Wherein, the front and the back of the welding seam have no defects of cracks, air holes, undercut, unfused and slag inclusion, and the like, and the inside of the welding seam has no defects of exceeding standards such as cracks, slag inclusion, air holes and the like, and meets the requirement of mechanical property. Meanwhile, a ball passing test is carried out by utilizing a ball passing with the outer diameter of 12.1mm, and the test ball passing can smoothly pass through the back welding seam, so that the standard requirement that the bulge of the back of the welding seam is lower than 0.45mm is met.
Comparative example 1
The Incoloy800H nickel-based alloy steel pipe and the T22 carbon steel pipe with the outer diameter of 19mm, the wall thickness of 3mm and the groove blunt edge thickness of 0.5mm are subjected to butt welding by the same method as the embodiment, and the difference is that: the backing weld, fill weld and cap weld were performed respectively using the welding parameters shown in table 3.
TABLE 3
After all welding is completed, the welded joint obtained in comparative example one is inspected. Although a ball passing test is carried out by utilizing a ball passing test with the outer diameter size of 12.1mm, the test ball can quickly pass through a back weld joint, in the whole backing weld, the peak current value of a 0-90-degree section is lower than 95A, the base current value is lower than 42A, the peak current value of a 90-180-degree section is lower than 88A, the base current value is lower than 39A, the peak current value of a 180-270-degree section is lower than 83A, the base current value is lower than 36A, the peak current value of a 270-0-degree section is lower than 82A, and the base current value is lower than 36A, so that the local non-fusion phenomenon can not be completely realized in the melting welding process of backing weld, and the non-fusion defect exists on the back of the weld joint.
Comparative example No. two
The Incoloy800H nickel-based alloy steel pipe and the T22 carbon steel pipe with the outer diameter of 19mm, the wall thickness of 3mm and the groove blunt edge thickness of 0.5mm are subjected to butt welding by the same method as the embodiment, and the difference is that: the backing weld, fill weld and cap weld were performed using the welding parameters shown in table 4, respectively.
TABLE 4
And after all welding is finished, observing and detecting the welding joint obtained in the second comparative example. Although the front side and the back side of the welding line do not have the defects of cracks, air holes, undercut, incomplete fusion, slag inclusion and the like, the inside of the welding line does not have the defects of exceeding standards such as cracks, slag inclusion, air holes and the like, and the mechanical property requirement is met. However, in the whole backing weld, the peak current value of the 0-90 ° section is higher than 115A, the base current value is higher than 62A, the peak current value of the 90-180 ° section is higher than 108A, the base current value is higher than 59A, the peak current value of the 180-270 ° section is higher than 103A, the base current value is higher than 56A, the peak current value of the 270-0 ° section is higher than 102A, and the base current value is higher than 56A, so that a large-size bulge is formed on the back of the weld joint, a through ball with the outer diameter of 12.1mm cannot pass through the back weld joint, namely the bulge on the back of the weld joint is higher than 0.45mm, and the standard requirement is not met.
Claims (6)
1. A welding method of a nickel-based alloy steel and carbon steel dissimilar material pipeline is characterized by comprising the following steps:
step S1, carrying out pairing between pipelines to be welded, controlling a pairing gap to be 0-1 mm, and filling protective gas into the back of a pairing groove;
step S2, backing welding the pipelines in group; carrying out segmented fusion welding on the truncated edge of the groove along the circumferential direction to form a penetration weld bead, and gradually reducing welding current in the whole fusion welding process;
step S3, filling and welding the pipelines by group; after backing welding is finished, filling welding is carried out on the backing weld bead until the filling welding on the whole circumference is finished;
step S4, performing cover surface welding between the paired pipelines; after the filling welding is finished, one or more cap welding is carried out to form a cap welding bead until the whole welding operation is finished;
in the step S1, a single V-shaped groove is adopted between the pipes to be welded, and the single-side slope of the groove is 15 to 25 degrees;
in step S1, after completing the assembly of the pipes to be welded, a plurality of fixing points are set between the assembly gaps to fix the positions of the pipes;
in the step S1, 3 fixed points are set between the pair-pairing gaps of the pair-pairing pipes, which are respectively located at the 0 °, 135 ° and 225 ° positions of the butt joint;
in the step S2, fusion welding is performed in four sections, namely, a 0-90 ° section, a 90-180 ° section, a 180-270 ° section, and a 270-0 ° section in the butt joint; wherein,
fusion welding is carried out between 0 and 90 degrees, the peak value range of welding current is 95 to 115A, the base value range is 42 to 62A, the peak value time is 0.20 to 0.26s, and the base value time is 0.36 to 0.42 s; melting welding at 90-180 degrees, wherein the peak value range of welding current is 88-108A, the base value range is 39-59A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s; melting welding at 180-270 degrees, wherein the peak value range of welding current is 83-103A, the base value range is 36-56A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s; and (3) melting welding between 270 and 0 degrees, wherein the peak value range of welding current is 82-102A, the base value range is 36-56A, the peak value time is 0.20-0.26 s, and the base value time is 0.36-0.42 s.
2. The welding method according to claim 1, wherein, when the peak value and the base value of the welding current are concomitantly adjusted in sections during the four-section fusion welding, the welding current value is reduced by 1 to 5A after each section of adjustment.
3. The welding method according to claim 2, characterized in that in step S3, segmented filling welding is employed, and the welding current is gradually reduced throughout the filling welding process.
4. The welding method according to claim 3, characterized in that in step S3, filling welding is performed in four sections, namely a 45-135 ° section, a 135-225 ° section, a 225-315 ° section and a 315-45 ° section in a butt joint; wherein,
filling and welding at 45-135 degrees, wherein the peak value range of welding current is 86-106A, the base value range is 33-53A, the voltage range is 9.0-10.0V, the welding speed is 63-67 mm/min, and the wire feeding speed is 325-335 mm/min; filling welding at 135-225 degrees, wherein the peak value range of welding current is 82-102A, the base value range is 28-48A, the voltage range is 8.7-9.7V, the welding speed is 63-67 mm/min, and the wire feeding speed is 325-335 mm/min; filling and welding between 225 and 315 degrees, wherein the peak value range of welding current is 79-99A, the base value range is 28-48A, the voltage range is 8.5-9.5V, the welding speed is 63-67 mm/min, and the wire feeding speed is 325-335 mm/min; and (3) filling welding between 315 and 45 degrees, wherein the peak value range of welding current is 76 to 96A, the base value range is 26 to 46A, the voltage range is 8.5 to 9.5V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 325 to 335 mm/min.
5. The welding method according to claim 4, characterized in that in step S4, segmented facing welding is adopted and the welding current is gradually reduced throughout the facing welding process.
6. The welding method according to claim 5, characterized in that in step S4, the cover surface welding is performed in four sections, namely 315-45 ° section, 45-135 ° section, 135-225 ° section and 225-315 ° section in the butt joint; wherein,
welding the cover surface between 315 and 45 degrees, wherein the peak value range of welding current is 88 to 108A, the base value range is 35 to 55A, the voltage range is 8.6 to 9.7V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 315 to 325 mm/min; the welding is carried out on the cover surface between 45 degrees and 135 degrees, the peak value range of the welding current is 85-105A, the base value range is 32-52A, the voltage range is 8.5-9.5V, the welding speed is 63-67 mm/min, and the wire feeding speed is 315-325 mm/min; the welding is carried out on the cover surface between 135 and 225 degrees, the peak value range of the welding current is 83 to 103A, the base value range is 33 to 53A, the voltage range is 8.5 to 9.5V, the welding speed is 63 to 67mm/min, and the wire feeding speed is 315 to 325 mm/min; and (3) cover surface welding between 225 and 315 degrees, wherein the peak value range of welding current is 82-102A, the base value range is 30-50A, the voltage range is 8.7-9.7V, the welding speed is 63-67 mm/min, and the wire feeding speed is 315-325 mm/min.
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| CN114762908B (en) * | 2021-01-13 | 2024-06-04 | 宝山钢铁股份有限公司 | One-step forming welding method for thin-wall low-alloy high-strength steel butt joint |
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