CN119589295A - Welding method for carbon steel continuous pipe butting dissimilar metal 20CrMo tool cylinder - Google Patents
Welding method for carbon steel continuous pipe butting dissimilar metal 20CrMo tool cylinder Download PDFInfo
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Abstract
The invention discloses a welding method of a 20CrMo tool cylinder for butt jointing of carbon steel continuous pipes, which comprises the steps of 1, annealing the tool cylinder, 2, straightening, cutting and fixing the continuous pipes, 3, cleaning the inner surface and the outer surface of the edges, beveling, 4, pipe end pairing and positioning welding, 5, clamping cooling blocks and heat insulation cotton, 6, welding, and 7, and performing welding seam treatment. According to the method, the positions of a plurality of gas lifting tools are preset in advance according to the condition in the well, and the gas lifting tools are welded and fixed, so that a 'continuous pipe and tool' welding integrated product can be provided for oilfield clients, the original continuous pipe gas lifting operation process of the oilfield is improved, the continuous pipe can be completely put into the well at one time, the gas lifting at the designed position of the continuous pipe is realized in a sectionalized manner, the wellhead pressure is reduced, the liquid discharge amount is increased, and the gas lifting operation construction cost is reduced.
Description
Technical Field
The invention belongs to the technical field of welding, and relates to a welding method of a 20CrMo tool cylinder for butt joint of carbon steel continuous pipes.
Background
The coiled pipe (Coiled Tubing, CT for short) is also called coiled oil pipe, coiled pipe or coiled pipe, is a continuous welded steel pipe with high strength and good plasticity produced by adopting special microalloy materials and unique manufacturing process, the single length can reach tens of thousands of meters, and the finished product is wound on a winding drum for transportation and delivery, and is mainly used in the operation fields of oil and gas field well repair, well logging, well drilling, well completion, oil and gas transportation and the like.
The existing continuous pipe gas lifting operation lifting method comprises the steps of firstly lifting production liquid from a continuous pipe to the ground through an annular space between the continuous pipe and a production oil pipe by injection gas and secondly lifting the production liquid from the annular space between the continuous pipe and the production oil pipe to the ground through injection of the injection gas. Both gas lifting methods are to lower the continuous pipe below the static liquid level in the well, and the continuous pipe needs to be lowered into the well for multiple times, and single-section gas lifting has the problems of long operation time, high operation cost and increased fatigue degree of the continuous pipe. The multi-section gas lift process refers to the process that a single-disc continuous pipe is welded at different positions, and a gas lift tool is additionally arranged for gas lift operation. The gas lifting tool is welded and fixed in sections, and a product welded by a continuous pipe and the tool can be directly applied to the well in the later period, so that single well descending multi-section gas lifting operation is realized, and the problems of long operation time, high wellhead pressure and the like of the current single-section gas lifting operation are solved.
When the coiled tubing product is delivered to a customer, the existence of a circumferential weld is not allowed in the middle of the whole coiled tubing, because the coiled tubing is subjected to severe tests of complex environments such as pulling, pressing, bending, corrosion and the like in the use process of the coiled tubing, the requirement on the weld is quite severe, and the conventional welding mode is difficult to meet.
Disclosure of Invention
The invention aims to provide a welding method for a 20CrMo tool cylinder for butt jointing dissimilar metals of a carbon steel continuous pipe, which solves the problems of long operation time, high wellhead pressure, particularly high processing and manufacturing difficulty and difficulty in meeting the requirements of a conventional welding mode in the prior art.
The technical scheme adopted by the invention is that the welding method of the dissimilar metal 20CrMo tool cylinder for butt joint of the carbon steel continuous pipe is implemented according to the following steps:
step 1, annealing the tool cylinder;
Step 2, straightening, cutting and fixing the continuous pipe;
Step3, cleaning the inner and outer surfaces of the opening edge and processing a groove;
step 4, pipe end assembly and positioning welding are carried out;
Step 5, clamping the cooling block and the heat-preserving cotton;
step 6, welding;
and 7, processing welding seams.
The method has the advantages that the method can preset a plurality of gas lifting tool positions in advance according to the condition in the well, and weld and fix the gas lifting tool positions, can provide a 'continuous pipe and tool' welding integrated product for oilfield clients, improves the original continuous pipe gas lifting operation process of the oilfield, can fully lower the continuous pipe into the well at one time, realizes segmented gas lifting at the design position of the continuous pipe, reduces wellhead pressure, increases liquid discharge amount, and reduces gas lifting operation construction cost.
Drawings
FIG. 1 is a schematic illustration of the preset position of a workpiece during welding in accordance with the method of the present invention;
FIG. 2 is a flow chart of a welding process of the method of the present invention;
FIG. 3 is a radiographic inspection photograph I of example 1 of the present invention;
FIG. 4 is a second radiographic inspection of example 1 of the present invention;
FIG. 5 is a radiographic inspection photograph I of example 2 of the present invention;
FIG. 6 is a second radiographic inspection of example 2 of the present invention;
FIG. 7 is a radiographic inspection photograph I of example 3 of the present invention;
FIG. 8 is a second radiographic inspection of example 3 of the present invention;
FIG. 9 is a radiographic inspection photograph I of example 4 of the present invention;
Fig. 10 is a radiographic inspection photograph two of embodiment 4 of the present invention.
In the figure, 1 is a continuous pipe and 2 is a tool cylinder.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
Referring to fig. 1, when the welding method of the invention is implemented, a continuous pipe 1 and a tool cylinder 2 are connected end to end in turn, the material of the continuous pipe 1 is CT80 steel grade carbon steel, the material of the tool cylinder 2 is dissimilar metal 20CrMo, the requirement of a welding seam at the joint of the continuous pipe 1 and the tool cylinder 2 is quite strict, the conventional welding mode is difficult to meet the requirement, and the welding is needed by the method of the invention.
Referring to fig. 2, the welding method of the dissimilar metal 20CrMo tool barrel for butt joint of the carbon steel continuous pipe of the present invention mainly comprises the steps of annealing the tool barrel 2, straightening the continuous pipe 1 at a predetermined welding position, cutting off at the predetermined position, polishing the pipe end, beveling, assembling and welding, water cooling the continuous pipe end, heat preservation of the tool barrel end, welding, external weld repairing, ray detection, and delivering to a customer after passing the qualification, and specifically comprises the following steps:
Step 1, annealing the tool cylinder 2;
the tool cylinder 2 made of 20CrMo material is annealed before welding, so that the material strength of the tool cylinder 2 is reduced, and the strength of the tool cylinder is matched with that of the continuous tube 1 made of CT80 material.
Step 2, straightening, cutting and fixing the continuous pipe 1;
Firstly, straightening operation within 3 meters of the pipe end of a preset position of the continuous pipe 1 (oil pipe) is completed by using straightening equipment, the straightening operation requires that the straightness B of the continuous pipe 1 within 1.5 meters is less than 2mm, and the continuous pipe 1 is cut by using pipe cutting equipment.
Step3, cleaning the inner and outer surfaces of the opening edge and processing a groove;
Firstly, oil stains are cleaned in the range of 15mm along the inner surface and 25mm along the outer surface of the port of the butt joint port of the continuous pipe 1 and the tool cylinder 2 by using an internal grinder and an angle grinder until the pipe ends of the continuous pipe 1 and the tool cylinder 2 are exposed out of metallic luster, wherein the internal grinder adopts an 80-100-mesh internal grinder head, and the angle grinder adopts 120-150-mesh angle grinding sheets;
then, the mechanical beveling machine is used for respectively beveling the butt joint ports of the continuous pipe 1 and the tool cylinder 2, and the angle of the bevels after the beveling is 37 degrees;
step 4, pipe end assembly and positioning welding are carried out;
Clamping the port of the continuous tube 1 and the port of the tool cylinder 2 to be welded on a welding assembly bench, adjusting the positions of the two opposite ports to enable the tube orifice assembly to be straight, enabling the assembly gap to be 2.2-2.5 mm, measuring the vertical direction and the horizontal direction of the tube end by adopting a ruler and a level meter, and ensuring that the continuous tube 1 and the tool cylinder 2 are welded in a positioning manner at 3 points, 9 points and 12 points of a welding seam respectively.
Step 5, clamping the cooling block and the heat-preserving cotton;
Clamping water-cooled copper blocks at the position 10-15mm away from the welding groove at one end of the continuous pipe 1 to be welded, and clamping heat-insulating cotton at the position 10-15mm away from the welding groove at one end of the tool cylinder 2 to be welded;
step 6, welding;
Firstly, manual argon tungsten-arc welding is adopted, the welding position is 5G full-position welding, and three-point positioning welding is respectively carried out at 12 points, 3 points and 9 points of a welding line;
then adopting a two-layer multi-section welding mode, backing welding current 65A, covering welding current 80A, and preserving heat for 5 minutes for the tool cylinder 2;
then cleaning the interlayer by using a steel wire brush until the metallic luster is exposed;
step7, welding line treatment;
And after finishing the cover surface welding, taking down the water-cooled copper block, firstly carrying out rough grinding by using an elastic abrasive disc with 80-100 meshes, then carrying out fine grinding by using an elastic abrasive disc with 120-150 meshes, and carrying out grinding until the welding seam is parallel to the base metal, wherein the grinding direction is parallel to the axial direction of the pipe body.
And a subsequent step, namely performing ray detection on the welding seam position of the finished product, and executing Q/SY BG 1023-2022 in a standard way.
Example 1
The material of the continuous pipe 1 is CT80 steel grade carbon steel, the material of the tool cylinder 2 is dissimilar metal 20CrMo, and the method is implemented according to the following steps:
step 1, annealing a 20CrMo tool cylinder;
Annealing the 20CrMo tool cylinder before welding to improve various tissue defects and residual stress caused in the welding process;
Step2, straightening, cutting and fixing the pipe ends;
Firstly, straightening operation within the range of 3 meters of the pipe end at the preset position of the continuous pipe 1 (oil pipe) is completed by using straightening equipment, and the straightening operation requires that the straightness B of the continuous pipe 1 within 1.5m is less than 2mm;
cutting the continuous pipe 1, and placing the cut continuous pipe 1 and the tool cylinder 2 on a welding assembly pair rack to be fixed reliably;
Step 3, surface cleaning and groove processing;
Firstly, oil stains are cleaned in the range of 15mm along the inner surface and 25mm along the outer surface of the port of the butt joint port of the continuous pipe 1 and the tool cylinder 2 by using an internal grinder and an angle grinder until the pipe ends of the continuous pipe 1 and the tool cylinder 2 are exposed out of metallic luster, wherein the internal grinder adopts an 80-mesh internal grinder head, and the angle grinder adopts a 120-mesh angle grinder plate;
then, the mechanical beveling machine is used for respectively beveling the butt joint ports of the continuous pipe 1 and the tool cylinder 2, and the angle of the bevels after the beveling is 37 degrees;
Step 4, performing pipe end group pairing;
Clamping the port of the continuous tube 1 and the port of the tool cylinder 2 to be welded on a welding assembly rack, adjusting the positions of the two opposite ports to enable the tube orifice assembly to be straight, enabling the assembly clearance to be 2.2mm, measuring the vertical direction and the horizontal direction of the tube end by adopting a ruler and a level meter, and ensuring that the assembly of the continuous tube 1 and the tool cylinder 2 is free from edge misalignment;
step 5, clamping the cooling block and the heat-insulating cotton;
Clamping a water cooling copper block at the position 10mm away from a welding groove at one end of a continuous pipe 1 to be welded, and clamping heat preservation cotton at the position 10mm away from the welding groove at one end of a tool cylinder 2 to be welded;
Step 6, welding is implemented;
Firstly, manual argon tungsten-arc welding is adopted, the welding position is 5G full-position welding, and three-point positioning welding is respectively carried out at 12 points, 3 points and 9 points of a welding line;
then adopting two layers of multi-section welding, backing welding current 65A, covering welding current 80A, and preserving heat of the tool cylinder 2 after welding for 5 minutes;
cleaning the interlayer by using a steel wire brush until the metallic luster is exposed;
step7, welding line treatment;
And after finishing the cover surface welding, taking down the water-cooled copper block, carrying out rough grinding by using an elastic abrasive disc with 80 meshes, carrying out fine grinding by using an elastic abrasive disc with 120 meshes, and polishing the welding seam to be level with the base metal, wherein the polishing direction is parallel to the axial direction of the pipe body.
And (3) performing ray detection on the welding line position of the finished product, and performing Q/SY BG 1023-2022 in a standard mode.
The data and results of the measurements relating to example 1 are shown in Table 1.
Example 2
The material of the continuous pipe 1 is CT80 steel grade carbon steel, the material of the tool cylinder 2 is dissimilar metal 20CrMo, and the method is implemented according to the following steps:
step 1, annealing a 20CrMo tool cylinder;
Annealing the 20CrMo tool cylinder before welding to improve various tissue defects and residual stress caused in the welding process;
Step2, straightening, cutting and fixing the pipe ends;
Firstly, straightening operation within the range of 3 meters of the pipe end at the preset position of the continuous pipe 1 (oil pipe) is completed by using straightening equipment, and the straightening operation requires that the straightness B of the continuous pipe 1 within 1.5m is less than 2mm;
cutting the continuous pipe 1, and placing the cut continuous pipe 1 and the tool cylinder 2 on a welding assembly pair rack to be fixed reliably;
Step 3, surface cleaning and groove processing;
Firstly, oil stains are cleaned in the range of 15mm along the inner surface and 25mm along the outer surface of the mouth of a butt joint port of a continuous pipe 1 and a tool cylinder 2 by using an internal grinder and an angle grinder until the pipe ends of the continuous pipe 1 and the tool cylinder 2 are exposed out of metallic luster, wherein the internal grinder adopts a 100-mesh internal grinder head, and the angle grinder adopts a 150-mesh angle grinder plate;
then, the mechanical beveling machine is used for respectively beveling the butt joint ports of the continuous pipe 1 and the tool cylinder 2, and the angle of the bevels after the beveling is 37 degrees;
Step 4, performing pipe end group pairing;
Clamping the port of the continuous tube 1 and the port of the tool cylinder 2 to be welded on a welding assembly rack, adjusting the positions of the two opposite ports to enable the tube orifice assembly to be straight, enabling the assembly clearance to be 2.5mm, measuring the vertical direction and the horizontal direction of the tube end by adopting a ruler and a level meter, and ensuring that the assembly of the continuous tube 1 and the tool cylinder 2 is free from edge misalignment;
step 5, clamping the cooling block and the heat-insulating cotton;
clamping a water cooling copper block at the position 15mm away from a welding groove at one end of a continuous pipe 1 to be welded, and clamping heat preservation cotton at the position 15mm away from the welding groove at one end of a tool cylinder 2 to be welded;
step 6, welding;
Firstly, manual argon tungsten-arc welding is adopted, the welding position is 5G full-position welding, and three-point positioning welding is respectively carried out at 12 points, 3 points and 9 points of a welding line;
then adopting two layers of multi-section welding, backing welding current 65A, covering welding current 80A, and preserving heat of the tool cylinder 2 after welding for 5 minutes;
cleaning the interlayer by using a steel wire brush until the metallic luster is exposed;
step7, welding line treatment;
And after the cover surface welding is finished, taking down the water-cooled copper block, carrying out rough grinding by using an elastic grinding disc with 100 meshes, carrying out fine grinding by using an elastic grinding disc with 150 meshes, and polishing the welding seam to be level with the base metal, wherein the polishing direction is parallel to the axial direction of the pipe body.
And (3) performing ray detection on the welding line position of the finished product, and performing Q/SY BG 1023-2022 in a standard mode.
The data and test results for example 2 are shown in Table 1.
Example 3
The material of the continuous pipe 1 is CT80 steel grade carbon steel, the material of the tool cylinder 2 is dissimilar metal 20CrMo, and the method is implemented according to the following steps:
step 1, annealing a 20CrMo tool cylinder;
Annealing the 20CrMo tool cylinder before welding to improve various tissue defects and residual stress caused in the welding process;
Step2, straightening, cutting and fixing the pipe ends;
Firstly, straightening operation within the range of 3 meters of the pipe end at the preset position of the continuous pipe 1 (oil pipe) is completed by using straightening equipment, and the straightening operation requires that the straightness B of the continuous pipe 1 within 1.5m is less than 2mm;
cutting the continuous pipe 1, and placing the cut continuous pipe 1 and the tool cylinder 2 on a welding assembly pair rack to be fixed reliably;
Step 3, surface cleaning and groove processing;
Firstly, oil stains are cleaned in the range of 15mm along the inner surface and 25mm along the outer surface of the port of the butt joint port of the continuous pipe 1 and the tool cylinder 2 by using an internal grinder and an angle grinder until the pipe ends of the continuous pipe 1 and the tool cylinder 2 are exposed out of metallic luster, wherein the internal grinder adopts a 90-mesh internal grinder head, and the angle grinder adopts 140-mesh angle grinding sheets;
then, the mechanical beveling machine is used for respectively beveling the butt joint ports of the continuous pipe 1 and the tool cylinder 2, and the angle of the bevels after the beveling is 37 degrees;
Step 4, performing pipe end group pairing;
Clamping the port of the continuous tube 1 and the port of the tool cylinder 2 to be welded on a welding assembly rack, adjusting the positions of the two opposite ports to enable the tube orifice assembly to be straight, enabling the assembly clearance to be 2.4mm, measuring the vertical direction and the horizontal direction of the tube end by adopting a ruler and a level meter, and ensuring that the assembly of the continuous tube 1 and the tool cylinder 2 is free from edge misalignment;
step 5, clamping the cooling block and the heat-insulating cotton;
Clamping a water cooling copper block at the position 12mm away from a welding groove at one end of a continuous pipe 1 to be welded, and clamping heat preservation cotton at the position 12mm away from the welding groove at one end of a tool cylinder 2 to be welded;
step 6, welding;
Firstly, manual argon tungsten-arc welding is adopted, the welding position is 5G full-position welding, and three-point positioning welding is respectively carried out at 12 points, 3 points and 9 points of a welding line;
then adopting two layers of multi-section welding, backing welding current 65A, covering welding current 80A, and preserving heat of the tool cylinder 2 after welding for 5 minutes;
cleaning the interlayer by using a steel wire brush until the metallic luster is exposed;
step7, welding line treatment;
and after the cover surface welding is finished, taking down the water-cooled copper block, firstly carrying out rough grinding by using a 90-mesh elastic abrasive disc, then carrying out fine grinding by using a 130-mesh elastic abrasive disc, and carrying out grinding on the welding seam until the welding seam is parallel to the base metal, wherein the grinding direction is parallel to the axial direction of the pipe body.
And (3) performing ray detection on the welding line position of the finished product, and performing Q/SY BG 1023-2022 in a standard mode.
The data and test results for example 3 are shown in Table 1.
Example 4
The material of the continuous pipe 1 is CT80 steel grade carbon steel, the material of the tool cylinder 2 is dissimilar metal 20CrMo, and the method is implemented according to the following steps:
step 1, annealing a 20CrMo tool cylinder;
Annealing the 20CrMo tool cylinder before welding to improve various tissue defects and residual stress caused in the welding process;
Step2, straightening, cutting and fixing the pipe ends;
Firstly, straightening operation within the range of 3 meters of the pipe end at the preset position of the continuous pipe 1 (oil pipe) is completed by using straightening equipment, and the straightening operation requires that the straightness B of the continuous pipe 1 within 1.5m is less than 2mm;
cutting the continuous pipe 1, and placing the cut continuous pipe 1 and the tool cylinder 2 on a welding assembly pair rack to be fixed reliably;
Step 3, surface cleaning and groove processing;
Firstly, oil stains are cleaned in the range of 15mm along the inner surface and 25mm along the outer surface of the port of the butt joint port of the continuous pipe 1 and the tool cylinder 2 by using an internal grinder and an angle grinder until the pipe ends of the continuous pipe 1 and the tool cylinder 2 are exposed out of metallic luster, wherein the internal grinder adopts an 80-mesh internal grinder head, and the angle grinder adopts an angle grinder with 150 meshes;
then, the mechanical beveling machine is used for respectively beveling the butt joint ports of the continuous pipe 1 and the tool cylinder 2, and the angle of the bevels after the beveling is 37 degrees;
Step 4, performing pipe end group pairing;
Clamping the port of the continuous tube 1 and the port of the tool cylinder 2 to be welded on a welding assembly rack, adjusting the positions of the two opposite ports to enable the tube orifice assembly to be straight and the assembly clearance to be 2.3mm, and measuring the vertical direction and the horizontal direction of the tube end by adopting a ruler and a level gauge to ensure that the assembly of the continuous tube 1 and the tool cylinder 2 is free from edge misalignment;
Step 5, clamping the cooling block and the heat preservation cotton,
Clamping a water cooling copper block at a position 15mm away from a welding groove at one end of a continuous pipe 1 to be welded, and clamping heat preservation cotton at a position 10mm away from the welding groove at one end of a tool cylinder 2 to be welded;
Step 6, welding is implemented;
Firstly, manual argon tungsten-arc welding is adopted, the welding position is 5G full-position welding, and three-point positioning welding is respectively carried out at 12 points, 3 points and 9 points of a welding line;
then adopting two layers of multi-section welding, backing welding current 65A, covering welding current 80A, and preserving heat of the tool cylinder 2 after welding for 5 minutes;
cleaning the interlayer by using a steel wire brush until the metallic luster is exposed;
step7, welding line treatment;
And after the cover surface welding is finished, taking down the water-cooled copper block, carrying out rough grinding by using an elastic grinding disc with 100 meshes, carrying out fine grinding by using an elastic grinding disc with 120 meshes, and polishing the welding seam to be level with the base metal, wherein the polishing direction is parallel to the axial direction of the pipe body.
And (3) performing ray detection on the welding line position of the finished product, and performing Q/SY BG 1023-2022 in a standard mode.
The data and test results for example 4 are shown in Table 1.
Table 1, comparative table of related data for four examples
Radiographs of example 1 are shown in fig. 3 and 4, radiographs of example 2 are shown in fig. 5 and 6, radiographs of example 3 are shown in fig. 7 and 8, and radiographs of example 4 are shown in fig. 9 and 10.
According to the four embodiments shown in table 1, the welding method of the present invention is adopted to successfully weld the 20CrMo tool cylinder of the carbon steel coiled tubing and complete the well running operation, and the method of connecting the 20CrMo tool cylinder to the coiled tubing by adopting the welding method is the first national example.
Claims (8)
1. The welding method of the dissimilar metal 20CrMo tool cylinder for butt joint of the carbon steel continuous pipe is characterized by comprising the following steps of:
step 1, annealing the tool cylinder;
Step 2, straightening, cutting and fixing the continuous pipe;
Step3, cleaning the inner and outer surfaces of the opening edge and processing a groove;
step 4, pipe end assembly and positioning welding are carried out;
Step 5, clamping the cooling block and the heat-preserving cotton;
step 6, welding;
and 7, processing welding seams.
2. The welding method of the carbon steel continuous tube butt-joint dissimilar metal 20CrMo tool barrel according to claim 1, wherein in the step1, the specific process is as follows:
And annealing the tool cylinder made of the 20CrMo material before welding, and reducing the material strength of the tool cylinder to enable the material strength of the tool cylinder to be matched with the strength of the continuous tube made of the CT80 material.
3. The welding method of the carbon steel continuous tube butt-joint dissimilar metal 20CrMo tool barrel according to claim 1, wherein in the step 2, the specific process is as follows:
Firstly, straightening operation of the pipe end of a preset position of the continuous pipe within 3 meters is completed by using straightening equipment, the straightness B of the continuous pipe within 1.5 meters is required to be less than 2mm after the straightening operation, and the continuous pipe is cut by using pipe cutting equipment.
4. The welding method of the carbon steel continuous tube butt-joint dissimilar metal 20CrMo tool barrel according to claim 1, wherein in the step 3, the specific process is as follows:
Firstly, oil stains are cleaned in the range of 15mm on the inner surface of the mouth edge and 25mm on the outer surface of the mouth edge of a butt joint port of a continuous pipe and a tool cylinder by using an internal grinder and an angle grinder until the pipe ends of the continuous pipe and the tool cylinder are exposed out of metallic luster, wherein the internal grinder adopts an 80-100-mesh internal grinder head, and the angle grinder adopts 120-150-mesh angle grinding sheets;
Then, the mechanical beveling machine is used for beveling the butt joint ports of the continuous pipe and the tool cylinder respectively, and the bevel angles after the beveling are 37 degrees.
5. The welding method of the carbon steel continuous tube butt-joint dissimilar metal 20CrMo tool barrel according to claim 1, wherein in the step 4, the specific process is as follows:
And clamping the port of the continuous pipe and the port of the tool cylinder to be welded on a welding assembly bench, adjusting the positions of the two opposite ports to enable the pipe orifice assembly to be straight, measuring the assembly clearance to be 2.2-2.5 mm in the vertical direction and the horizontal direction of the pipe end by adopting a ruler and a level meter, and ensuring that the continuous pipe and the tool cylinder assembly are free from wrong edges and are respectively welded at 3 points, 9 points and 12 points of a welding seam in a positioning way.
6. The welding method of the carbon steel continuous tube butt-joint dissimilar metal 20CrMo tool barrel according to claim 1, wherein in the step 5, the specific process is as follows:
and clamping water-cooled copper blocks at the position 10-15mm away from the welding groove at one end of the continuous pipe to be welded, and clamping heat-insulating cotton at the position 10-15mm away from the welding groove at one end of the tool cylinder to be welded.
7. The welding method of the carbon steel continuous tube butt-joint dissimilar metal 20CrMo tool barrel according to claim 1, wherein in the step 6, the specific process is as follows:
Firstly, manual argon tungsten-arc welding is adopted, the welding position is 5G full-position welding, and three-point positioning welding is respectively carried out at 12 points, 3 points and 9 points of a welding line;
then adopting a two-layer multi-section welding mode, backing welding current 65A, covering welding current 80A, and preserving heat for 5 minutes;
Then, the interlayer was cleaned with a wire brush until metallic luster was exposed.
8. The welding method of the carbon steel continuous tube butt-joint dissimilar metal 20CrMo tool barrel according to claim 1, wherein in the step7, the specific process is as follows:
After the cover surface welding is finished, the water-cooled copper block is taken down, firstly, an elastic abrasive disc with 80-100 meshes is used for rough grinding, then an elastic abrasive disc with 120-150 meshes is used for fine grinding, the welding seam is polished to be level with the base metal, and the polishing direction is parallel to the axial direction of the pipe body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311132975.5A CN119589295A (en) | 2023-09-04 | 2023-09-04 | Welding method for carbon steel continuous pipe butting dissimilar metal 20CrMo tool cylinder |
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| CN202311132975.5A CN119589295A (en) | 2023-09-04 | 2023-09-04 | Welding method for carbon steel continuous pipe butting dissimilar metal 20CrMo tool cylinder |
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