CN117020759A - Girth weld treatment method for TIG welding butt-joint steel pipes - Google Patents
Girth weld treatment method for TIG welding butt-joint steel pipes Download PDFInfo
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- CN117020759A CN117020759A CN202311225948.2A CN202311225948A CN117020759A CN 117020759 A CN117020759 A CN 117020759A CN 202311225948 A CN202311225948 A CN 202311225948A CN 117020759 A CN117020759 A CN 117020759A
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- 238000003466 welding Methods 0.000 title claims abstract description 154
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000002161 passivation Methods 0.000 claims abstract description 35
- 238000005498 polishing Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 210000001503 joint Anatomy 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000009991 scouring Methods 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 230000001680 brushing effect Effects 0.000 claims abstract description 9
- 239000004576 sand Substances 0.000 claims abstract description 4
- 238000005554 pickling Methods 0.000 claims description 31
- 238000000137 annealing Methods 0.000 claims description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- 230000007797 corrosion Effects 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 11
- 239000003112 inhibitor Substances 0.000 claims description 11
- 239000002562 thickening agent Substances 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- -1 hydrogen ions Chemical class 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000004677 Nylon Substances 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 5
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 5
- 238000005491 wire drawing Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract 1
- 238000011010 flushing procedure Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 8
- 230000007704 transition Effects 0.000 description 8
- 239000010953 base metal Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical group C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- 235000021355 Stearic acid Nutrition 0.000 description 4
- 239000011324 bead Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 235000019359 magnesium stearate Nutrition 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 4
- 239000008117 stearic acid Substances 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- IADRPEYPEFONML-UHFFFAOYSA-N [Ce].[W] Chemical compound [Ce].[W] IADRPEYPEFONML-UHFFFAOYSA-N 0.000 description 1
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- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- FAYUQEZUGGXARF-UHFFFAOYSA-N lanthanum tungsten Chemical compound [La].[W] FAYUQEZUGGXARF-UHFFFAOYSA-N 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- WLTSUBTXQJEURO-UHFFFAOYSA-N thorium tungsten Chemical compound [W].[Th] WLTSUBTXQJEURO-UHFFFAOYSA-N 0.000 description 1
- 150000003657 tungsten Chemical class 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/02—Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
- B24B29/04—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for rotationally symmetrical workpieces, e.g. ball-, cylinder- or cone-shaped workpieces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/085—Iron or steel solutions containing HNO3
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a girth weld treatment method, in particular to a girth weld treatment method for a TIG welding butt joint steel pipe, and belongs to the technical field of TIG post-welding treatment. The technical scheme for solving the problems is as follows: s1, coating acid washing passivation paste on an annular welding seam of TIG welding; s2, brushing the oxide skin clean by using a brush; s3, cleaning by using water; s4, polishing the annular weld joint by using a fine sand belt; s5, polishing by using a scouring pad. The invention processes the annular welding seam, so that the outer welding seam has no oxide film, and the annular welding seam is difficult to find without special attention, thereby having the advantage of attractive welding seam.
Description
Technical Field
The invention relates to a girth weld treatment method, in particular to a girth weld treatment method for a TIG welding butt joint steel pipe, and belongs to the technical field of TIG post-welding treatment.
Background
Soldering is one of the most common metal connection means. Welding also has a number of specific ways, and the skilled man usually uses TIG welding (Tungsten Inert Gas, abbreviated TIG) when joining two stainless steel pipes. TIG welding generally refers to tungsten inert gas welding, and specifically includes: pure tungsten or activated tungsten (thorium tungsten, cerium tungsten, zirconium tungsten, lanthanum tungsten) is used as the inert gas shielded arc welding of the non-melting electrode. The principle is as follows: melting the added welding wire by using an arc between the tungsten electrode and the workpiece as a heat source to form a weld; the tungsten electrode is not melted in the welding process and only plays a role of an electrode; while being protected by argon or helium fed through the nozzle of the torch.
Subsequent processing of the weld is also typically required after the pipe is welded. The post-welding treatment standard and the requirements of the pipeline mainly comprise the following steps:
1. cleaning the surface of the welding line in time;
2. appearance inspection is qualified: the appearance of the welding seam is well molded, and the welding seam should be smoothly transited; the surface of the welding line is not lower than the surface of the base metal; the surface of the welding line is not allowed to have the defects of cracks, unfused, air holes, slag inclusion, splashing and the like;
3. cleaning welded junctions, cleaning the inside of a tube bore, closing tube orifices, and sorting and arranging the tube orifices in order;
4. the assembly of the butt welded junctions of the pipelines must be realized that the inner walls are flush, and the offset of the inner walls cannot exceed the standard.
In the TIG welding butt-joint steel pipes, a non-negligible problem is that a layer of oxide film is formed on the surface of the girth weld after TIG welding is adopted between the stainless steel pipes. Because the appearance of the outer weld seam is convex, the joint position of the weld seam and the steel pipe is a processing dead angle, and the oxide skin at the dead angle position cannot be removed cleanly by common abrasive belt polishing and the like. Even if the abrasive belt with larger cutting amount is adopted for polishing, after the condition that the outer welding seam is flush with the substrate is formed, a large amount of oxide skin is not cleaned at the original dead angle position.
However, reports on how to solve such problems do not appear in the prior art.
Disclosure of Invention
The invention aims to solve the problems, and provides a girth weld treatment method for TIG welding butt-joint steel pipes.
The invention has the characteristics of no oxide film at the outer welding seam and attractive welding seam by carrying out multi-step treatment on dead angle positions.
The technical scheme for solving the problems is as follows:
s1, coating pickling passivation paste on the annular welding seam of the TIG welded butt joint steel pipe, and keeping for more than 3 minutes;
s2, brushing the annular welding seam and the oxide skin around the annular welding seam by using a brush;
s3, cleaning the annular welding seam by using water;
s4, polishing the annular weld joint by using a fine sand belt; the polishing treatment is carried out, the part, protruding out of the outer peripheral surface of the steel pipe, of the annular welding seam is polished, and the annular welding seam is enabled to be flush with the steel pipes at the two ends of the annular welding seam and smoothly transited;
s5, polishing the annular welding seam by using a scouring pad.
According to the technical scheme, firstly, the pickling passivation paste is used for smearing the surface of the annular welding seam, then a brush is used for brushing oxide skin corroded by the pickling passivation paste, the brush can comprehensively clean the original dead angle position without dead angle, and then water is used for cleaning; then, polishing is carried out by using a fine sand belt, and the part of the welding seam, which is higher than the base metal, is polished off, so that the welding seam is flush with the base metal at the two ends of the welding seam and smoothly transits, and the annular welding seam of the butt joint steel pipe has the advantage of attractive appearance; divided by the above, the invention polishes the annular weld with the scouring pad, so that the annular weld and the surrounding area thereof are not only flush and smooth, but also approximate in visual effect, thereby achieving the effect that the annular weld is difficult to find without special attention.
As a preferable mode of the above technical solution, the step S1 of applying the pickling passivation paste, specifically, using the pickling passivation paste to fully cover the annular weld bead, and ensuring that the thickness of the pickling passivation paste is above 0.8mm.
As a further preferable aspect of the above-described method, the thickness of the paste applied by the acid-washing passivation paste is 0.8 to 2.0mm.
Preferably, according to the above technical scheme, the bristles of the brush are metal wires.
As a further preferable aspect of the above technical solution, the bristles of the brush are stainless steel.
As a preferable mode of the above technical solution, in step S3, water is used to clean the annular weld, specifically, a high-pressure water gun is used to flush the annular weld and the surrounding area thereof.
As a preferable mode of the above technical solution, in step S4, the polishing treatment of the annular weld bead using a fine abrasive belt, specifically, polishing treatment of the annular weld bead using a polishing machine whose execution part is a fine abrasive belt, so that the surplus Gao mm of the annular weld bead is equal to or larger than 200 mesh abrasive belt.
As a preferable mode of the above technical solution, in step S5, the scouring pad is a nylon scouring pad with silicon carbide suitable for stainless steel wire drawing.
As the optimization of the technical scheme, the pickling passivation paste comprises nitric acid, hydrofluoric acid, a corrosion inhibitor and a thickening agent, and the density is 1.28-1.30 g/cm & lt 3 > the concentration of hydrogen ions is 5 x 10 x 3-8.5 x 10 x 3mmol/kg.
As the preferable choice of the technical scheme, the corrosion inhibitor is one or more selected from molybdate, silicate, phosphate, polyphosphate, benzotriazole and amine substances.
As a preferable mode of the technical scheme, the amine substance is urotropine.
Preferably, the thickener is stearate.
As the optimization of the technical scheme, the method further comprises the step S6 after the step S5, wherein the step S6 is to perform stress relief annealing on the TIG welding butt joint steel pipe, and the temperature of the stress relief annealing is 540-640 ℃.
In summary, the invention has the following beneficial effects:
1. the invention processes the annular welding seam, so that the outer welding seam has no oxide film, and the annular welding seam is difficult to find without special attention, thereby having the advantage of beautiful welding seam;
2. the method is convenient to operate, does not need to input expensive equipment, and has simple and clear operation steps and high treatment efficiency;
3. the invention is suitable for the external welding seam treatment of butt welding seams of various steel pipes with different sizes, and has wide applicability.
Detailed Description
The present embodiments are merely illustrative of the invention and not limiting of the invention, and any changes made by those skilled in the art after reading the specification of the invention will be protected by the patent laws within the scope of the claims.
Example 1
A girth weld treatment method for TIG welding butt-joint steel pipes comprises the following steps:
s1, coating pickling passivation paste on an annular welding seam of a TIG welded butt joint steel pipe, wherein the thickness of the coating paste is 1.5mm, and keeping for about 5min; the density of the pickling passivation paste is 1.28-1.30 g/cm < 3 >; the concentration of hydrogen ions is 5 x 10 x 3-8.5 x 10 x 3mmol/kg; the pickling passivation paste comprises nitric acid, hydrofluoric acid, a corrosion inhibitor and a thickening agent; the corrosion inhibitor is urotropine; the thickening agent is a mixture of stearic acid and magnesium stearate;
s2, brushing the annular welding seam and the oxide skin around the annular welding seam by using a brush; the bristles of the brush are stainless steel;
s3, cleaning the annular welding seam by using water; the method specifically comprises the steps of flushing the annular welding seam and the surrounding area by adopting a high-pressure water gun; wiping off water stains after flushing;
s4, polishing the annular welding seam by adopting a polishing machine with an execution part being a fine abrasive belt, and polishing out the part of the annular welding seam protruding out of the outer circumferential surface of the steel pipe, so that the annular welding seam is flush with the steel pipes at the two ends of the annular welding seam and smoothly transits, and the surplus Gao mm of the annular welding seam is formed; the fine abrasive belt is an abrasive belt with more than 200 meshes, specifically 240 meshes;
s5, polishing the annular welding seam by using a scouring pad; the scouring pad is a nylon scouring pad with silicon carbide, which is suitable for stainless steel wire drawing.
Example two
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the smearing thickness of the pickling passivation paste is 0.8mm.
Example III
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the smearing thickness of the pickling passivation paste is 1.2mm.
Example IV
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the smearing thickness of the pickling passivation paste is 2.0mm.
Example five
A girth weld treatment method for TIG welding butt-joint steel pipes comprises the following steps:
s1, coating pickling passivation paste on an annular welding seam of a TIG welded butt joint steel pipe, wherein the thickness of the coating paste is 0.8mm, and keeping for about 5min; the density of the pickling passivation paste is 1.28-1.30 g/cm < 3 >; the concentration of hydrogen ions is 5 x 10 x 3-8.5 x 10 x 3mmol/kg; the pickling passivation paste comprises nitric acid, hydrofluoric acid, a corrosion inhibitor and a thickening agent; the corrosion inhibitor is urotropine; the thickening agent is a mixture of stearic acid and magnesium stearate;
s2, brushing the annular welding seam and the oxide skin around the annular welding seam by using a brush; the bristles of the brush are stainless steel;
s3, cleaning the annular welding seam by using water; the method specifically comprises the steps of flushing the annular welding seam and the surrounding area by adopting a high-pressure water gun; wiping off water stains after flushing;
s4, polishing the annular welding seam by adopting a polishing machine with an execution part being a fine abrasive belt, and polishing out the part of the annular welding seam protruding out of the outer circumferential surface of the steel pipe, so that the annular welding seam is flush with the steel pipes at the two ends of the annular welding seam and smoothly transits, and the surplus Gao mm of the annular welding seam is formed; the fine abrasive belt is an abrasive belt with more than 200 meshes, specifically 240 meshes;
s5, polishing the annular welding seam by using a scouring pad; the scouring pad is nylon scouring pad with silicon carbide suitable for stainless steel wire drawing;
s6, carrying out stress relief annealing on the TIG welded butt joint steel pipe, wherein the temperature of the stress relief annealing is 600-620 ℃.
Example six
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the stress relief annealing temperature is 500-520 ℃.
Example seven
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the stress relief annealing temperature is 520-540 ℃.
Example eight
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the stress relief annealing temperature is 540-560 ℃.
Example nine
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the stress relief annealing temperature is 560-580 ℃.
Examples ten
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the stress relief annealing temperature is 580-600 ℃.
Example eleven
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the stress relief annealing temperature is 620-640 ℃.
Example twelve
The girth weld treatment method of the TIG welding butt joint steel pipe is different from the first embodiment only in that: the stress relief annealing temperature is 640-660 ℃.
Comparative example one
A girth weld treatment method for TIG welding butt-joint steel pipes comprises the following steps:
s1, polishing the annular welding seam by adopting a polishing machine with an execution part being a fine abrasive belt, and removing the part of the annular welding seam protruding out of the outer peripheral surface of the steel pipe, so that the annular welding seam is flush with the steel pipes at the two ends of the annular welding seam and smoothly transits, and the surplus Gao mm of the annular welding seam is formed; the fine abrasive belt is an abrasive belt with more than 200 meshes, specifically 240 meshes;
s2, cleaning the annular welding seam by using water; the method specifically comprises the steps of flushing the annular welding seam and the surrounding area by adopting a high-pressure water gun; after flushing, the water stain is wiped off.
Comparative example two
A girth weld treatment method for TIG welding butt-joint steel pipes comprises the following steps:
s1, polishing the annular welding seam by adopting a polishing machine with an execution part being a fine abrasive belt, and removing the part of the annular welding seam protruding out of the outer peripheral surface of the steel pipe, so that the annular welding seam is flush with the steel pipes at the two ends of the annular welding seam and smoothly transits, and the surplus Gao mm of the annular welding seam is formed; the fine abrasive belt is an abrasive belt with more than 200 meshes, specifically 240 meshes;
s2, brushing the annular welding seam and the oxide skin around the annular welding seam by using a brush; the bristles of the brush are stainless steel;
s3, cleaning the annular welding seam by using water; the method specifically comprises the steps of flushing the annular welding seam and the surrounding area by adopting a high-pressure water gun; after flushing, the water stain is wiped off.
Comparative example three
A girth weld treatment method for TIG welding butt-joint steel pipes comprises the following steps:
s1, polishing the annular welding seam by adopting a polishing machine with an execution part being a fine abrasive belt, and removing the part of the annular welding seam protruding out of the outer peripheral surface of the steel pipe, so that the annular welding seam is flush with the steel pipes at the two ends of the annular welding seam and smoothly transits, and the surplus Gao mm of the annular welding seam is formed; the fine abrasive belt is an abrasive belt with more than 200 meshes, specifically 240 meshes;
s2, coating pickling passivation paste on the annular welding seam of the TIG welded butt joint steel pipe, wherein the thickness of the coating paste is 1.5mm, and keeping for about 5min; the density of the pickling passivation paste is 1.28-1.30 g/cm < 3 >; the concentration of hydrogen ions is 5 x 10 x 3-8.5 x 10 x 3mmol/kg; the pickling passivation paste comprises nitric acid, hydrofluoric acid, a corrosion inhibitor and a thickening agent; the corrosion inhibitor is urotropine; the thickening agent is a mixture of stearic acid and magnesium stearate;
s3, brushing the annular welding seam and the oxide skin around the annular welding seam by using a brush; the bristles of the brush are stainless steel;
s4, cleaning the annular welding seam by using water; the method specifically comprises the steps of flushing the annular welding seam and the surrounding area by adopting a high-pressure water gun; after flushing, the water stain is wiped off.
Comparative example four
A girth weld treatment method for TIG welding butt-joint steel pipes comprises the following steps:
s1, polishing the annular welding seam by adopting a polishing machine with an execution part being a fine abrasive belt, and removing the part of the annular welding seam protruding out of the outer peripheral surface of the steel pipe, so that the annular welding seam is flush with the steel pipes at the two ends of the annular welding seam and smoothly transits, and the surplus Gao mm of the annular welding seam is formed; the fine abrasive belt is an abrasive belt with more than 200 meshes, specifically 240 meshes;
s2, coating pickling passivation paste on the annular welding seam of the TIG welded butt joint steel pipe, wherein the thickness of the coating paste is 1.5mm, and keeping for about 5min; the density of the pickling passivation paste is 1.28-1.30 g/cm < 3 >; the concentration of hydrogen ions is 5 x 10 x 3-8.5 x 10 x 3mmol/kg; the pickling passivation paste comprises nitric acid, hydrofluoric acid, a corrosion inhibitor and a thickening agent; the corrosion inhibitor is urotropine; the thickening agent is a mixture of stearic acid and magnesium stearate;
s3, brushing the annular welding seam and the oxide skin around the annular welding seam by using a brush; the bristles of the brush are stainless steel;
s4, cleaning the annular welding seam by using water; the method specifically comprises the steps of flushing the annular welding seam and the surrounding area by adopting a high-pressure water gun; wiping off water stains after flushing;
s5, polishing the annular welding seam by using a scouring pad; the scouring pad is a nylon scouring pad with silicon carbide, which is suitable for stainless steel wire drawing.
The effect of different coating thicknesses on the appearance of the girth weld
| Example 1 | Example two | Example III | Example IV | |
| Evaluation | ◎ | ○ | ◎ | ◎ |
And (3) the following materials: the outer welding seam is attractive, and the transition of the joint of the outer welding seam and the base material is not obvious;
o: the outer welding seam is attractive, the joint of the outer welding seam and the base material is flush but has obvious transition, and no oxide scale residue exists;
delta: the outer weld joint is attractive, the joint of the outer weld joint and the base metal has obvious transition, and a small amount of oxide skin residues exist;
x: the outer weld joint is not attractive, the joint of the outer weld joint and the base metal has obvious transition, and a large amount of oxide skin residues exist.
Influence of the destressing annealing temperature on the appearance of the girth weld
| Evaluation | Evaluation | ||
| Example five | ◎ | Example nine | ○ |
| Example six | △ | Examples ten | ○ |
| Example seven | △ | Example eleven | ○ |
| Example eight | △ | Example twelve | △ |
And (3) the following materials: the outer welding seam is attractive, and the transition of the joint of the outer welding seam and the base material is not obvious;
o: the outer welding seam is attractive, the joint of the outer welding seam and the base material is flush but has obvious transition, and no oxide scale residue exists;
delta: the outer weld joint is attractive, the joint of the outer weld joint and the base metal has obvious transition, and a small amount of oxide skin residues exist;
x: the outer weld joint is not attractive, the joint of the outer weld joint and the base metal has obvious transition, and a large amount of oxide skin residues exist.
Table three effects of process steps on girth weld appearance
| Example 1 | Comparative example one | Comparative example two | Comparative example three | Comparative example four | |
| Evaluation | ◎ | × | × | △ | ○ |
From the above control experiments, it can be seen that:
1) The thickness of the coating film of the pickling passivation paste has obvious influence on the treatment effect of an external welding line, and when the thickness of the coating film of the pickling passivation paste is lower than 0.8mm, the bad effect of incomplete oxide skin removal is generated; when the thickness of the coating film is more than or equal to 1.2mm, the effect of removing the oxide scale is better;
2) The stress relief annealing temperature has a certain influence on the treatment effect of the outer weld, and the temperature is selected to be preferably 540-640 ℃, especially preferably 600-620 ℃; while when the temperature exceeds the above range, both too low and too high adversely affect the effect of the treatment of the weld.
3) The processing steps have obvious influence on the processing effect of the appearance of the girth weld, and the effect is not ideal as long as the pickling passivation paste is not adopted in advance before the abrasive belt processing in comparison with the first embodiment and the fourth embodiment, even if other steps are the same; from the comparison of the second comparative example and the third comparative example, the influence of the acid-washing passivation paste is a main factor, and even if the acid-washing passivation paste is not used in advance, the appearance of the girth weld can be improved to some extent in the later use.
Claims (10)
1. A girth weld treatment method for TIG welding butt-joint steel pipes comprises the following steps:
s1, coating pickling passivation paste on the annular welding seam of the TIG welded butt joint steel pipe, and keeping for more than 3 minutes;
s2, brushing the annular welding seam and the oxide skin around the annular welding seam by using a brush;
s3, cleaning the annular welding seam by using water;
s4, polishing the annular weld joint by using a fine sand belt; the polishing treatment is carried out, the part, protruding out of the outer peripheral surface of the steel pipe, of the annular welding seam is polished, and the annular welding seam is enabled to be flush with the steel pipes at the two ends of the annular welding seam and smoothly transited;
s5, polishing the annular welding seam by using a scouring pad.
2. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 1, wherein: and (3) coating the pickling passivation paste in the step (S1), namely using the pickling passivation paste to fully cover the annular welding seam, and ensuring that the thickness of the coating paste of the pickling passivation paste is more than 0.8mm.
3. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 2, wherein: ensuring the thickness of the coating paste of the pickling passivation paste to be 0.8-2.0 mm.
4. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 1, wherein: the brush hair of the brush is made of metal wires.
5. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 1, wherein: the brush hair of the brush is stainless steel.
6. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 1, wherein: in step S3, water is used to clean the annular weld, specifically, a high-pressure water gun is used to flush the annular weld and the surrounding area thereof.
7. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 1, wherein: in step S4, polishing the annular weld by using a fine abrasive belt, specifically polishing the annular weld by using a polisher with an execution component being a fine abrasive belt, so that the surplus Gao mm of the annular weld is made, and the fine abrasive belt is an abrasive belt with more than 200 meshes.
8. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 1, wherein: in step S5, the scouring pad is a nylon scouring pad with silicon carbide, which is suitable for stainless steel wire drawing.
9. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 1, wherein: the pickling passivation paste comprises nitric acid, hydrofluoric acid, a corrosion inhibitor and a thickening agent, wherein the density is 1.28-1.30 g/cm & lt 3 > the concentration of hydrogen ions is 5 x 10 x 3-8.5 x 10 x 3mmol/kg.
10. The girth weld treatment method for TIG welding butt-jointed steel pipes according to claim 1, wherein: and S6, carrying out stress relief annealing on the TIG welded butt joint steel pipe, wherein the temperature of the stress relief annealing is 540-640 ℃.
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