CN104084672A - Titanium pipe welding process of seawater lift pump system - Google Patents
Titanium pipe welding process of seawater lift pump system Download PDFInfo
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- CN104084672A CN104084672A CN201410294644.6A CN201410294644A CN104084672A CN 104084672 A CN104084672 A CN 104084672A CN 201410294644 A CN201410294644 A CN 201410294644A CN 104084672 A CN104084672 A CN 104084672A
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- welding
- welding process
- pump system
- titanium pipe
- lift pump
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/164—Arc welding or cutting making use of shielding gas making use of a moving fluid
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
Abstract
The invention relates to a titanium pipe welding process of a seawater lift pump system. The titanium pipe welding process comprises the following steps of step 1, selecting the closed welding environment; step 2, cleaning welds of a titanium pipe and welding wires to be utilized through the acetone before the titanium pipe is assembled; step 3, performing the equal wall thickness V-shaped groove abutting joint on the titanium pipe, performing alignment on a pipeline and adopting a grinding or machining mode during groove machining, wherein the angle of a groove is 50 to 70 degrees, a root gap is 2 to 4 mm, and the blunt edge is 0 to 1 mm; step 4, implementing back side protection and drag covert protection after the assembly is achieved, wherein the 99.999% high-purity canned argon gas is selected to serve as the protection gas and the pressure is not less than 25 bar; step 5, performing welding in a two-person piecewise symmetric welding mode; step 6, performing arc blow-out and performing continuous protection through the protection gas until the surface temperature drops to below 100 DEG C. According to the titanium pipe welding process of the seawater lift pump system, the welding quality of the titanium pipe can meet the use requirements of the seawater lift pump system, the welding process is stable, the control is convenient, the practicability is high, and the large economic and social benefits can be produced.
Description
Technical field
The present invention relates to Ship Building and Repairing field, relate in particular to seawater lift pump system titanium tube welding process.
Background technology
Titanium or titanium alloy has good toughness, elevated temperature strength, a corrosion-resistant and processing characteristics so that its density is little, and these excellent performances are applied in the industry of high-end product widely.But because the speed of the fusing of titanium alloy in welding process absorption oxygen, nitrogen, hydrogen, carbon is fast, (titanium is at 250 ℃ of above hydrogen of inhaling, 400 ℃ of above oxygen uptakes, 600 ℃ of above nitrogen of inhaling), the intensity of alloy and hardness are increased, and plasticity and toughness drop, easily there is brittle fracture in weld seam; In addition, be easy to produce pore in welding process, pore has larger baneful influence to plasticity, fracture toughness, impact flexibility and fatigue strength aspect, yet has the defects such as oxidation, impurity simultaneously, and these problems have all been brought certain difficulty to welding.Control Welding Process requirement is high, difficulty is large, causes the quality of welding to be difficult to reach requirement.
For the FPSO (abbreviation of Floating Production Storage & Offloading, Chinese translation is " floating type production, storage and offloading device ") welding of seawater lift pump pollutant-removing system, this system pipes based material is titanium alloy (ASTM B861GR2), working environment more complicated due to this system, from seawater through excessive storehouse again to the open-air atmosphere of deck plane, each environment has different media and different temperature, material in pipe also has certain corrosivity, and FPSO stores landing platform for a long time in operation at sea as the large-scale Floating Production in sea, maintenance difficulty and cost is once very high, so this system is higher to the requirement of mother metal and welding quality.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, seawater lift pump system titanium tube welding process is provided, its control flow is reasonable, makes the welding quality of titanium pipe reach the instructions for use of seawater lift pump system.
The present invention is achieved by the following technical solutions:
Seawater lift pump system titanium tube welding process, is characterized in that comprising the following steps: (1) selects the welding surroundings of sealing, and this welding surroundings is clean, independent, and the humidity of air is no more than 60%, and temperature is not less than 15 ℃; (2), before the assembling of titanium pipe, with acetone, clear up on titanium pipe weld seam and near all scales, slag, oxide or other external metals, the welding wire of cleaning titanium pipe and will using; (3) the wall thickness double V-groove such as titanium pipe employing docking, pipeline centering, alignment deviation can not surpass 0.75mm, groove adds man-hour, adopts polishing or mach mode, and cut edge is guaranteed smooth, 50～70 ° of bevel angles, root gap 2～4mm, root face 0～1mm; (4) after titanium pipe has assembled, implement back-protective and drag cover protection, protection gas is selected 99.999% canned high-purity argon, and pressure is not less than 25bar; (5) protect overleaf and drag cover to weld under guard mode, welding protection region wind speed is no more than 1 meter per second, takes the mode that segmentation is symmetrically welded to carry out; (6) blow-out, protection gas continues protection, until surface temperature is reduced to below 100 ℃.
Further, described (2) step comprises: before the assembling of titanium pipe, by cleaning near all scales, slag, oxide or other the external metals on weld seam and weld seam with the clean of acetone without cotton, inside and outside titanium pipe in 100mm region, weld seam two ends, all use acetone scrub, the welding wire that will use also passes through same cleaning, in above cleaning course, operator all dresses white cotton gloves, forbids directly contacting pipe fitting and wlding with hand.
Further, described (3) step also comprises: groove adds man-hour, check cut edge, guarantee smooth, the defect that there is no crackle, breach and other influences welding quality, the processing of groove defect is by polishing off with hand-operated tools or directly surperficial polishing vestige, crackle, irregular place being melted away with tungsten electrode, and then polishing, absolutely not allows repair welding.
Preferably, described drag cover protection to refer to drag cover contact closely with titanium pipe, welding gun with drag cover by special messenger, to be responsible for respectively, drag the mobile and corresponding movement of covering with welding gun to guarantee the gas shield of welding process.
Further, back-protective is 25L/min with the gas flow that drags cover to protect.
Preferably, before the welding of described (5) step starts, with oxygen analyser, measure the oxygen content of titanium pipe inside, when oxygen content keeps within least 10 minutes, just starting to weld in lower than 0.002% situation.
Preferably, in described (5) step welding process, the width of each welding bead is no more than 10mm.
Preferably, the diverse location of the starting point and ending point of each layer in circumference in described (5) step welding process.
Preferably, the welding parameter of described (5) step welding process is as follows: prime coat adopts the welding method of GTAW, selecting diameter is that the rank of 2.4mm is that ERTi-2, the trade mark are the wldings of TI-2, current polarity is DCEN, current range 65～79A, voltage range 8～10V, speed of welding is 35-45mm/min, heat input is 0.7-1.4kj/mm; Packed layer adopts the welding method of GTAW, and selecting diameter is that the rank of 2.4mm is that ERTi-2, the trade mark are the wldings of TI-2, and current polarity is DCEN, current range 73～86A, voltage range 8～10V, speed of welding is 44-70mm/min, heat input is 0.5-1.2kj/mm; Capping layer adopts the welding method of GTAW, and selecting diameter is that the rank of 2.4mm is that ERTi-2, the trade mark are the wldings of TI-2, and current polarity is DCEN, current range 75～85A, voltage range 8～10V, speed of welding is 36-45mm/min, heat input is 0.8-1.4kj/mm.
Further, in the welding process of described (5) step, with some temperature meter, continue detection layers temperature, guarantee that interlayer temperature is up to 100 ℃.
By titanium tube welding process of the present invention, can effectively avoid the absorption to oxygen, nitrogen, hydrogen, carbon etc. in titanium pipe welding process, and avoid the pore of welding process to produce, reach high-quality welding effect, make the welding quality of titanium pipe reach the instructions for use of seawater lift pump system, welding process is stable, is convenient to control, practical, can produce larger economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is seawater lift pump system titanium pipe bevel for welding structural representation;
Fig. 2 a is the seawater lift pump system titanium tube welding process segmentation welding schematic diagram one of embodiment 1;
Fig. 2 b is the seawater lift pump system titanium tube welding process segmentation welding schematic diagram two of embodiment 1;
Fig. 3 is the testing position schematic diagram of embodiment 3, and the unit that indicates position in figure is mm;
Wherein, the implication that each mark represents is:
A, B, C, D represent respectively each tack welding solder joint; E, F represent respectively to test position;
α-bevel angle, b-root gap, c-root face.
The specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
Embodiment 1
The seawater lift pump system titanium tube welding process of the present embodiment, is characterized in that comprising the following steps:
(1) select the welding surroundings of a sealing, this welding surroundings is full clean, independent, and the humidity of air is no more than 60%, and temperature is not less than 15 ℃, must avoid the impact of other air-flows in the process of welding.
(2) before the assembling of titanium pipe, by cleaning near all scales, slag, oxide or other the external metals on weld seam and weld seam with the clean of acetone without cotton, inside and outside titanium pipe in 100mm region, weld seam two ends, all use acetone scrub, the welding wire that will use also passes through same cleaning, in above cleaning course, operator all dresses white cotton gloves, forbids directly contacting pipe fitting and wlding with hand.
(3) the wall thickness double V-groove such as titanium pipe employing docking, pipeline centering, alignment deviation can not surpass 0.75mm, groove adds man-hour, adopt polishing or mach mode, check cut edge, guarantee smoothly, there is no the defect of crackle, breach and other influences welding quality, with hand-operated tools or with tungsten electrode directly by the polishing vestige of groove end surface, crackle and irregular local removal, then polishing, absolutely not allow repair welding, bevel angle α is 50～70 °, root gap b=2～4mm, root face c=0～1mm, as shown in Figure 1.
(4) after titanium pipe has assembled, implement back-protective and drag cover protection, protection gas is selected 99.999% canned high-purity argon; pressure is not less than 25bar, and gas flow is 25L/min, for dragging cover protection; can, by dragging cover to be fixed on welding gun, also can be responsible for dragging by special messenger the movement of cover.Preferably, drag cover contact closely with titanium pipe, welding gun with drag cover by special messenger, to be responsible for respectively, drag the mobile and corresponding movement of covering with welding gun to guarantee the gas shield of welding process.
(5) protect overleaf and drag cover to weld under guard mode; welding protection region wind speed is no more than 1 meter per second; take the mode that segmentation is symmetrically welded to carry out; as shown in Fig. 2 a or Fig. 2 b; first carry out tack welding (tack weld is respectively ABC or ABCD), then two people carry out balanced welding from 6 positions to 12 positions respectively.Preferably, before welding starts, with oxygen analyser, measure the oxygen content of titanium pipe inside, when oxygen content keeps within least 10 minutes, just starting to weld in lower than 0.002% situation.During welding, the width of each welding bead is no more than 10mm, and the diverse location of the starting point and ending point of each layer in circumference, further improves welding quality.The selected welding parameter of the present embodiment, as following table 1, continues a detection layers temperature with some temperature meter during welding, guarantees that interlayer temperature is up to 100 ℃.
Table 1 welding parameter table
(6) blow-out, protection gas continues protection, until surface temperature is reduced to below 100 ℃.
Adopt the titanium pipe of the seawater lift pump system titanium tube welding process welding of the present embodiment for two FPSO of YuSBM company of You Wo company cooperation, to reequip the marine elevator pump system of projects, because the welding quality of titanium pipe has obtained good control, obtained SBM shipowner and ABS marine surveyor's consistent approval.
Embodiment 2
Titanium pipe (specification ф 60.3 * 5.54mm, trade mark B861Gr.2) to embodiment 1 welding carries out Mechanics Performance Testing, and the environment temperature of test is 24 ℃, and result is as following table 2:
Titanium pipe mechanical experimental results after table 2 welding
Using ASME as examination criteria, and above Mechanics Performance Testing is qualified.
Embodiment 3
Titanium pipe (specification ф 60.3 * 5.54mm, trade mark B861Gr.2) to embodiment 1 welding carries out Mechanics Performance Testing, and the environment temperature of test is 25 ℃, and result of the test hardness (HV10) is as following table 3:
Titanium pipe hardness test result after table 3 welding
Using ASME as examination criteria, and above hardness test is qualified.
Embodiment 4
Titanium pipe (the specification ф 60.3 * 5.54mm of embodiment 1 welding, trade mark B861Gr.2) carry out metallographic detection, the environment temperature of test is 24 ℃, test method is as follows: on test tube, intercept 2 of macroscopical metallographic specimens, sample is polished, after polishing, with hydrofluoric acid (0.5mL), hydrochloric acid (1.5mL), nitric acid (2.5mL) and water (95.5mL) solution, corrode, then clean, dry up, visually observe.On inspection, do not find obvious weld defect.Using ASME as examination criteria, and it is qualified that metallographic detects.
Finally it should be noted that: these are only the preferred embodiments of the present invention; be not limited to the present invention; although the present invention is had been described in detail with reference to embodiment; for a person skilled in the art; its technical scheme that still can record previous embodiment is modified; or part technical characterictic is wherein equal to replacement; but within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (10)
1. seawater lift pump system titanium tube welding process, is characterized in that comprising the following steps:
(1) select the welding surroundings of sealing, this welding surroundings is clean, independent, and the humidity of air is no more than 60%, and temperature is not less than 15 ℃;
(2), before the assembling of titanium pipe, with acetone, clear up on titanium pipe weld seam and near all scales, slag, oxide or other external metals, the welding wire of cleaning titanium pipe and will using;
(3) the wall thickness double V-groove such as titanium pipe employing docking, pipeline centering, alignment deviation can not surpass 0.75mm, groove adds man-hour, adopts polishing or mach mode, and cut edge is guaranteed smooth, 50～70 ° of bevel angles, root gap 2～4mm, root face 0.5～1mm;
(4) after titanium pipe has assembled, implement back-protective and drag cover protection, protection gas is selected 99.999% canned high-purity argon, and pressure is not less than 25bar;
(5) protect overleaf and drag cover to weld under guard mode, welding protection region wind speed is no more than 1 meter per second, takes the mode that segmentation is symmetrically welded to carry out;
(6) blow-out, protection gas continues protection, until surface temperature is reduced to below 100 ℃.
2. seawater lift pump system titanium tube welding process according to claim 1, it is characterized in that, described (2) step comprises: before the assembling of titanium pipe, by cleaning near all scales, slag, oxide or other the external metals on weld seam and weld seam with the clean of acetone without cotton, inside and outside titanium pipe in 100mm region, weld seam two ends, all use acetone scrub, the welding wire that will use also passes through same cleaning, in above cleaning course, operator all dresses white cotton gloves, forbids directly contacting pipe fitting and wlding with hand.
3. seawater lift pump system titanium tube welding process according to claim 1, it is characterized in that, described (3) step also comprises: groove adds man-hour, check cut edge, guarantee smoothly, there is no the defect of crackle, breach and other influences welding quality, the processing of groove defect is by polishing off with hand-operated tools or directly surperficial polishing vestige, crackle, irregular place being melted away with tungsten electrode, and then polishing, absolutely not allow repair welding.
4. seawater lift pump system titanium tube welding process according to claim 1; it is characterized in that; described drag cover protection to refer to drag cover contact closely with titanium pipe, welding gun with drag cover by special messenger, to be responsible for respectively, drag the mobile and corresponding movement of covering with welding gun to guarantee the gas shield of welding process.
5. seawater lift pump system titanium tube welding process according to claim 1, is characterized in that, back-protective and the gas flow that drags cover to protect are 25L/min.
6. seawater lift pump system titanium tube welding process according to claim 1, it is characterized in that, before the welding of described (5) step starts, with oxygen analyser, measure the oxygen content of titanium pipe inside, when oxygen content keeps within least 10 minutes, just starting to weld in lower than 0.002% situation.
7. seawater lift pump system titanium tube welding process according to claim 1, is characterized in that, in described (5) step welding process, the width of each welding bead is no more than 10mm.
8. seawater lift pump system titanium tube welding process according to claim 1, is characterized in that, the diverse location of the starting point and ending point of each layer in circumference in described (5) step welding process.
9. seawater lift pump system titanium tube welding process according to claim 1, it is characterized in that, the welding parameter of described (5) step welding process is as follows: prime coat adopts the welding method of GTAW, selecting diameter is that the rank of 2.4mm is that ERTi-2, the trade mark are the wldings of TI-2, current polarity is DCEN, current range 65～79A, voltage range 8～10V, speed of welding is 35-45mm/min, and heat input is 0.7-1.4kj/mm; Packed layer adopts the welding method of GTAW, and selecting diameter is that the rank of 2.4mm is that ERTi-2, the trade mark are the wldings of TI-2, and current polarity is DCEN, current range 73～86A, voltage range 8～10V, speed of welding is 44-70mm/min, heat input is 0.5-1.2kj/mm; Capping layer adopts the welding method of GTAW, and selecting diameter is that the rank of 2.4mm is that ERTi-2, the trade mark are the wldings of TI-2, and current polarity is DCEN, current range 75～85A, voltage range 8～10V, speed of welding is 36-45mm/min, heat input is 0.8-1.4kj/mm.
10. seawater lift pump system titanium tube welding process according to claim 9, is characterized in that, in the welding process of described (5) step, with some temperature meter, continues detection layers temperature, guarantees that interlayer temperature is up to 100 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410294644.6A CN104084672A (en) | 2014-06-26 | 2014-06-26 | Titanium pipe welding process of seawater lift pump system |
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| CN201410294644.6A CN104084672A (en) | 2014-06-26 | 2014-06-26 | Titanium pipe welding process of seawater lift pump system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107738026A (en) * | 2017-11-21 | 2018-02-27 | 山西焦化股份有限公司 | A kind of titanium method for welding pipeline and device |
| CN113070598A (en) * | 2021-03-30 | 2021-07-06 | 广州文冲船舶修造有限公司 | Manufacturing and mounting method of oil transportation platform I-shaped pipe under FPSO |
| CN114029596A (en) * | 2021-12-10 | 2022-02-11 | 中国化学工程第六建设有限公司 | Titanium pipeline welding method |
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| JPH08197243A (en) * | 1995-01-24 | 1996-08-06 | Nippon Steel Corp | Gas metal arc welding method |
| JP2000218391A (en) * | 1999-02-02 | 2000-08-08 | Nippon Steel Corp | Gas shield arc welding wire for line pipe, and gas shield arc welding method of line pipe perimeter |
| CN101804500A (en) * | 2010-04-01 | 2010-08-18 | 中国建筑第七工程局有限公司 | Titanium tube welding process |
| CN102266998A (en) * | 2011-07-25 | 2011-12-07 | 中国石化集团第四建设公司 | Automatic argon tungsten-arc welding method for small-bore titanium pipeline |
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2014
- 2014-06-26 CN CN201410294644.6A patent/CN104084672A/en active Pending
Patent Citations (4)
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| JPH08197243A (en) * | 1995-01-24 | 1996-08-06 | Nippon Steel Corp | Gas metal arc welding method |
| JP2000218391A (en) * | 1999-02-02 | 2000-08-08 | Nippon Steel Corp | Gas shield arc welding wire for line pipe, and gas shield arc welding method of line pipe perimeter |
| CN101804500A (en) * | 2010-04-01 | 2010-08-18 | 中国建筑第七工程局有限公司 | Titanium tube welding process |
| CN102266998A (en) * | 2011-07-25 | 2011-12-07 | 中国石化集团第四建设公司 | Automatic argon tungsten-arc welding method for small-bore titanium pipeline |
Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107738026A (en) * | 2017-11-21 | 2018-02-27 | 山西焦化股份有限公司 | A kind of titanium method for welding pipeline and device |
| CN113070598A (en) * | 2021-03-30 | 2021-07-06 | 广州文冲船舶修造有限公司 | Manufacturing and mounting method of oil transportation platform I-shaped pipe under FPSO |
| CN114029596A (en) * | 2021-12-10 | 2022-02-11 | 中国化学工程第六建设有限公司 | Titanium pipeline welding method |
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Address after: 511462 Nansha District, Guangzhou, No. sailing Road, No. 10, self made by the author of the 4 (office building), No. 1 Applicant after: The ship dengxi shipyard (Guangzhou) Co. Ltd. Address before: 511462 Guangdong city of Guangzhou province Nansha District Longxue Street Longxue Road Applicant before: The ship sailing ship in Chengxi (Guangzhou) Co. Ltd. |
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Application publication date: 20141008 |