CN113634853B - Method for welding composite steel pipeline with material of 1-1/4Cr-1/2Mo +410S - Google Patents
Method for welding composite steel pipeline with material of 1-1/4Cr-1/2Mo +410S Download PDFInfo
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- CN113634853B CN113634853B CN202110992379.9A CN202110992379A CN113634853B CN 113634853 B CN113634853 B CN 113634853B CN 202110992379 A CN202110992379 A CN 202110992379A CN 113634853 B CN113634853 B CN 113634853B
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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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
- B23K9/0052—Welding of pipe panels
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- 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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/328—Cleaning of weld torches, i.e. removing weld-spatter; Preventing weld-spatter, e.g. applying anti-adhesives
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- Arc Welding In General (AREA)
Abstract
The invention relates to a method for welding a composite steel pipeline made of 1-1/4Cr-1/2Mo +410S, wherein a V-shaped groove is selected for welding, the welding sequence is changed into the welding sequence of firstly welding a multi-layer, then welding a transition layer and finally welding a base layer. Manual tungsten argon arc welding is adopted for multilayer welding, and flux-cored wire TGF-309L is used for welding once; manual argon tungsten-arc welding is adopted for welding the transition layer, and S309L welding wires are used for welding once and are welded to the transition layer; the base layer filling cover surface adopts manual electric arc welding, and an ENi6625 nickel-based welding rod is used, so that the welding seam can be subjected to no heat treatment, one-time nondestructive detection is carried out after the welding is finished, and the welding operation is completely finished outside the pipeline, so that the condition that a welder enters the pipeline for operation is avoided, and the problems of poor welding environment, high labor intensity of the welder and the like are solved.
Description
Technical Field
The invention belongs to the field of petrochemical device process pipeline construction, and particularly relates to a welding method of a composite steel pipeline made of 1-1/4Cr-1/2Mo + 410S.
Background
The composite steel pipeline related to the flexible coking device is made of 1-1/4Cr-1/2Mo +410S, the base layer is made of 1-1/4Cr-1/2Mo, and the composite layer is made of 410S. The design pressure is 0.39MPa, and the design temperature is 538 ℃. The composite steel pipeline is formed by rolling composite steel plates, so the pipe diameter is larger. According to the regulations of SHT 3527-2009 composite stainless steel welding regulations for petrochemical engineering, manual arc welding is adopted for welding the composite steel pipeline, and the groove is X-shaped, as shown in the attached drawing 1. The sequence is that firstly welding a base layer, welding a transition layer and finally welding a multiple layer after the base layer is subjected to back chipping, heat treatment and qualified specified nondestructive testing items, and performing nondestructive testing again according to specified welding seams after welding is finished. R307 welding rods are used for base layer welding, R309 welding rods are used for transition layer welding, and E410 welding rods are used for multilayer welding. This welding method has the following disadvantages: (1) the field processing of the V-shaped groove is easy, labor-consuming and time-consuming; (2) carrying out heat treatment after the welding of the base layer is finished; (3) The nondestructive detection of the welding seam needs to be carried out twice, wherein the welding is finished on the base layer once, and the welding seam is completely welded another time; (4) The welding of the transition layer and the compound layer is carried out in the pipeline, the welding environment is poor, and the labor intensity is high.
Disclosure of Invention
The invention aims to provide a method for welding a composite steel pipeline made of 1-1/4Cr-1/2Mo +410S, wherein the welding operation is completely finished outside the pipeline, so that a welder is prevented from entering the pipeline for operation, and the problems of poor welding environment, high labor intensity of the welder and the like are solved.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for welding a composite steel pipeline made of 1-1/4Cr-1/2Mo +410S comprises the following steps:
firstly, cutting and beveling a composite steel pipe, wherein a V-shaped bevel is selected as the bevel;
step two, assembling the composite steel pipes;
step three, welding the composite steel pipe; firstly welding a cladding layer, then welding a transition layer and finally welding a base layer, wherein the cladding layer is welded by adopting manual tungsten argon arc welding and welding once by using flux-cored wire TGF-309L; manual argon tungsten-arc welding is adopted for welding the transition layer, and S309L welding wires are used for welding once to be welded above the transition layer; the substrate fill cap was arc welded by hand using an ENi6625 nickel based electrode.
Further, in the first step, the angle of the V-shaped crevasse is 55-65 degrees.
Further, in the first step, surface cleaning is carried out on the groove and the two sides of the groove within the range of 20mm respectively.
Furthermore, in the second step, when the welded junctions of the composite steel pipes are paired, the staggered edge amount of the paired junctions is less than or equal to 2mm by taking the multiple layers as a reference.
Furthermore, in the third step, the welding of the multiple layers and the transition layer uses small-line energy for multi-pass welding, and the temperature between welding passes is less than or equal to 100 ℃.
Further, in the third step, the preheating temperature is 80-100 ℃ before welding the base layer, and the preheating temperature is kept until the welding is finished, wherein the preheating range is within the range of more than or equal to 100mm on each of the two sides of the welding bead.
Furthermore, in the third step, the thickness of each filling metal of the welding line is less than or equal to 2mm.
Furthermore, in the third step, the thickness of the weld metal of the transition layer at the base layer is 1.5 mm-2.5 mm, and the thickness at the composite layer is 0.5 mm-2 mm.
And further, in the third step, PT coloring detection is carried out after the welding of the composite layer and the transition layer is finished, and RT ray detection is carried out on the welding seam after the welding of the base layer is finished.
Compared with the prior art, the V-shaped groove is selected, the groove is easy to process, and the construction efficiency can be obviously improved. The welding sequence is changed into welding the multiple layers firstly, then welding the transition layer and finally welding the base layer, and the welding operation is completely finished outside the pipeline, so that the problem that a welder enters the pipeline for operation is avoided, and the problems of poor welding environment, high labor intensity of the welder and the like are solved.
Manual tungsten argon arc welding is adopted for multilayer welding, and flux-cored wire TGF-309L is used for welding once; manual argon tungsten-arc welding is adopted for welding the transition layer, and S309L welding wires are used for welding once and are welded to the transition layer; and manual arc welding is adopted for the base layer filling cover surface, and an ENi6625 nickel-based welding rod is used, so that the welding seam can be subjected to no heat treatment, and one-time nondestructive testing is performed after the welding is finished.
Drawings
FIG. 1 is a schematic diagram of welding a composite steel pipe with an X-shaped groove in the prior art.
FIG. 2 is a schematic view of a V groove according to the present invention.
FIG. 3 is a schematic cross-sectional view of a weld in the welding method of the present invention.
Fig. 4 is a flow chart of a welding method of the present invention.
In the figure, A is a base layer and B is a multilayer.
Detailed Description
As will be further clearly and completely explained in the following technical scheme claimed by the present invention, the material of the composite steel pipeline is 1-1/4Cr-1/2Mo +410S in the embodiment, the material of the base layer is 1-1/4Cr-1/2Mo, the material of the clad layer is 410S, the thickness of the base layer is 12mm, and the thickness of the clad layer is 3 mm.
Cutting and beveling composite steel pipe
The cutting and the groove processing of the composite steel pipe adopt a mechanical method, and the cutting surface is smooth. The machined groove is subjected to appearance inspection, and cracks and delamination cannot occur. The groove is a V-shaped groove, and as shown in FIG. 2, the angle theta of the V-shaped break is 55-65 degrees. And cleaning the surfaces of the groove and the two sides of the groove within the range of 20mm respectively to remove dirt such as oil stain, water, rust, oxide skin and the like.
(II) assembling the composite steel pipes
The composite steel pipe weld crater group takes the composite layer as a reference correspondingly, and the butt joint misalignment amount is not more than 50% of the thickness of the composite layer and is not more than 2mm at most. In the embodiment, the distance a between the staggered edges is 2-3mm, and the staggered edge amount b is 0.5-1.5.
In the assembly process of the composite steel pipe, the tool clamp is welded on one side of the base layer, the tool clamp cannot be welded on the composite layer, and the welding material which is the same as the welding base layer metal is adopted. When the fixture is removed, the base metal is prevented from being damaged, and the welding position is polished smoothly.
(III) requirements for solder materials
Welding rods and welding wires have to have a delivery quality certificate (the welding materials meet the requirements of NB/T47018-2017 welding material ordering technical conditions for pressure-bearing equipment). The quality certification includes chemical components and mechanical performance of deposited metal, and all indexes meet relevant regulations. Before the welding material is put in storage, the quality certificate must be checked carefully, appearance inspection is strictly carried out, and whether the welding material is affected with damp needs to be noticed; the welding materials are put in storage in a classified mode, and the marks are complete. The coating of the welding rod can not fall off or has obvious cracks, argon gas adopted by argon arc welding meets the regulations of the current national standard argon GB/T4842-2017, the purity is not lower than 99.99 percent, and the water content is less than 50mg/L.
The welding rod is baked before use according to requirements, and the purpose of baking the welding rod is to remove moisture in the coating of the welding rod and reduce or eliminate the harm of hydrogen to weld metal. The welding rod ENi6625 is baked at 300 deg.C for 1 hr, and dried and stored at 100-150 deg.C.
Welding method for (IV) composite steel pipe
The welding sequence is that the multi-layer is welded firstly, then the transition layer is welded, and finally the base layer is welded.
The multilayer welding adopts manual argon tungsten-arc welding and uses flux-cored wire TGF-309L for welding once. The clad layer material is 410S, if the clad layer is welded by adopting a common welding wire, argon must be filled in the tube, the argon filling difficulty in the tube is high, a large amount of argon is consumed, the argon filling effect is not good, and in order to ensure the welding quality, the flux-cored wire TGF-309L is selected according to a welding process evaluation report and relevant specifications under the condition that the argon is not filled in the tube. The transition layer is welded by manual argon tungsten-arc welding and welding wires S309L to be above the transition layer. The base layer filling cover surface adopts manual arc welding, an ENi6625 nickel-based welding rod is used, the ENi6625 nickel-based welding rod has high temperature resistance, and heat treatment can be avoided on site.
The section of the welding line is shown in figure 3, the welding of the composite layer and the transition layer uses small-line energy multi-pass welding, and the temperature between welding passes is less than or equal to 100 ℃.
The preheating temperature of the welding opening before welding is 80-100 ℃, and the preheating temperature is kept until the welding is finished, wherein the preheating ranges are respectively not less than 5 times of the wall thickness of the two sides of the welding bead, and the minimum preheating range is not less than 100mm. The preheating is slow and uniform, and local temperature overheating is prevented. During preheating, an infrared thermometer is used for measuring temperature, and measuring points are uniformly distributed. Preheating can reduce the cooling rate of the welding joint, is favorable for the diffusion hydrogen in the welding seam metal to escape, and can avoid hydrogen induced cracks. And (2) preheating can reduce welding stress.
The thickness of each filling metal of the welding line is not more than 2mm, the thickness of the welding metal of the transition layer at the base layer is 1.5 mm-2.5 mm, and the thickness of the welding metal of the compound layer is O.5mm-2 mm. The residual height of the inner wall welding leg is not more than 2mm. And (4) immediately carrying out appearance inspection after welding, wherein the forming is required to be good, the surface cannot have defects such as cracks, craters, splashes and the like, and the defects are found and removed immediately.
The welding adopts multilayer multi-pass welding, as shown in fig. 3 1-6, the interlayer joints are staggered, each welding seam is welded with more than two layers, after one layer of welding is finished, interlayer slag is cleaned in time, and then the next layer of welding is carried out. And welding the weldment in time after the preheating temperature is reached, and continuously welding each welding line once under the condition of keeping the preheating temperature.
And for the pipeline welding with the diameter larger than DN500, two-person symmetrical welding, sectional step-back welding and welding deformation control are adopted.
And performing PT coloring detection after the welding of the composite layer and the transition layer is finished, and performing RT ray detection on a welding seam after the welding of the base layer is finished.
The above embodiment has been applied to 1-1/4Cr-1/2Mo +410S composite steel pipe welding in a constant elegance (Wenley) PMB petrochemical project 100 ten thousand tons/year flexible coking device which is responsible for construction by the applicant, the whole construction scheme is shown in FIG. 4, and the application of the method has positive effects on improving construction efficiency, improving construction environment of workers and reducing labor intensity of the workers.
Claims (6)
1. A method for welding a composite steel pipeline made of 1-1/4Cr-1/2Mo +410S is characterized by comprising the following steps:
firstly, cutting and processing a groove of the composite steel pipe, wherein the groove is a V-shaped groove;
step two, assembling the composite steel pipes;
step three, welding the composite steel pipe; firstly welding a cladding layer, then welding a transition layer and finally welding a base layer, wherein the cladding layer is welded by adopting manual tungsten argon arc welding and welding once by using flux-cored wire TGF-309L; manual argon tungsten-arc welding is adopted for welding the transition layer, and S309L welding wires are used for welding once and are welded to the transition layer; adopting manual arc welding on the base layer filling cover surface, and using an ENi6625 nickel-based welding rod;
the welding of the compound layer and the transition layer uses small linear energy for multi-pass welding, and the temperature between welding passes is less than or equal to 100 ℃; the thickness of each filling metal of the welding line is less than or equal to 2mm; the thickness of the weld metal of the transition layer at the base layer is 1.5 mm-2.5 mm, and the thickness at the compound layer is 0.5 mm-2 mm.
2. The method of claim 1, wherein: in the first step, the angle of the V-shaped groove is 55-65 degrees.
3. The method according to claim 1 or 2, characterized in that: in the first step, the groove and the two sides of the groove are subjected to surface cleaning within the range of 20mm respectively.
4. The method of claim 3, wherein: in the second step, when the welding seams of the composite steel pipe are paired, the staggered edge amount of the paired seams is less than or equal to 2mm by taking the composite layer as a reference.
5. The method according to claim 1 or 4, characterized in that: in the third step, the preheating temperature is 80-100 ℃ before welding the base layer, and the preheating temperature is kept until the welding is finished, and the preheating range is within the range of more than or equal to 100mm on both sides of the welding bead.
6. The method of claim 5, wherein: and in the third step, PT coloring detection is carried out after the welding of the composite layer and the transition layer is finished, and RT ray detection is carried out on the welding seam after the welding of the base layer is finished.
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| CN202110992379.9A CN113634853B (en) | 2021-08-27 | 2021-08-27 | Method for welding composite steel pipeline with material of 1-1/4Cr-1/2Mo +410S |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362249A (en) * | 2008-09-12 | 2009-02-11 | 西安向阳航天材料股份有限公司 | Girth welding method of duplex stainless steel bimetal composite pipe |
| CN101633074A (en) * | 2009-07-16 | 2010-01-27 | 西安交通大学 | Welding method of girth weld of inner cladding thin-walled stainless steel composite tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101850460A (en) * | 2010-05-21 | 2010-10-06 | 中国石化集团第五建设公司 | Welding process of 12Cr1MoV high-pressure pipeline CO2 semiautomatic or automatic gas shielded welding |
| CN101972878B (en) * | 2010-10-12 | 2012-08-22 | 中国化学工程第七建设有限公司 | Process for welding duplex stainless steel |
| CN108788405A (en) * | 2018-06-21 | 2018-11-13 | 天津大学 | The tungsten argon arc welding method of austenitic heat-resistance steel |
| CN109530883A (en) * | 2018-11-16 | 2019-03-29 | 上海盛剑环境系统科技股份有限公司 | A kind of stainless steel 310S welding procedure |
| CN110560844A (en) * | 2019-09-16 | 2019-12-13 | 中国化学工程第六建设有限公司 | Welding method of nickel-based material pipeline |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362249A (en) * | 2008-09-12 | 2009-02-11 | 西安向阳航天材料股份有限公司 | Girth welding method of duplex stainless steel bimetal composite pipe |
| CN101633074A (en) * | 2009-07-16 | 2010-01-27 | 西安交通大学 | Welding method of girth weld of inner cladding thin-walled stainless steel composite tube |
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