CN108890087A - A kind of welding method of S32750 super-duplex stainless steel welded tube - Google Patents
A kind of welding method of S32750 super-duplex stainless steel welded tube Download PDFInfo
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- CN108890087A CN108890087A CN201810686899.5A CN201810686899A CN108890087A CN 108890087 A CN108890087 A CN 108890087A CN 201810686899 A CN201810686899 A CN 201810686899A CN 108890087 A CN108890087 A CN 108890087A
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- steel pipe
- welding
- stainless steel
- briquetting
- welded tube
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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
- B23K9/235—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The present invention relates to a kind of welding methods of S32750 super-duplex stainless steel welded tube.It includes the following steps：I installs a pair of of briquetting roller additional on argon tungsten-arc welding production line, and briquetting roller has arc-shaped forming tank, and the forming tank of two briquetting rollers is clipped in the two sides of steel pipe；Steel pipe drives briquetting roller rotation；II welding gun welds groove to be welded in the top of steel pipe, after welding pool is formed, using the molten bath rear end of thermal imaging system searching argon tungsten-arc welding, and the region that temperature is 800 ~ 1200 DEG C, and by the line at two briquetting roller centers, adjust mobile so far region；The distance between III two briquetting rollers of adjustment make protrusion control in weld seam upper surface after extruding to the 5% ~ 20% of thickness of steel pipe to squeezing in the range areas of 800 ~ 1200 DEG C of molten bath rear end.The intensity for the S32750 two phase stainless steel welded tube longitudinal seam that the present invention welds, greater than the intensity of S32750 two phase stainless steel welded tube base material.
Description
Technical field
The present invention relates to a kind of steel-pipe welding method, in particular to a kind of weldering of S32750 super-duplex stainless steel welded tube
Connect method.
Background technique
S32750 super-duplex stainless steel due to Cr, Mo with higher and N content, while in room temperature texture austenite with
Ratio of ferrite is according to about 1:1 coexists, therefore has high intensity（Its yield strength is generally twice of austenitic stainless steel）, it is good
Outstanding advantages of resistance to Cl- spot corrosion well, anticorrosion stress-resistant and welding performance, in fields such as petrochemical industry, salt manufacturing, water conservancy project, shipbuildings
It is used widely.Compared with the super austenitic stainless steel 254SMO of same level, resistance to spot corrosion indices P REN is suitable, is more than
40, but the content of its Ni only has 7%, and far below the 18% of 254SMO, yield strength is about twice of 254SMO, is guaranteeing to make in this way
Under the premise of the service life, material can be further thinned, economical more significant.
When soldering diphasic stainless steel, it is preferred that emphasis is guarantee its two-phase proportion and avoid the occurrence of harmful phase.For fillable
The welding method of metal can cross the wlding of alloying by using Ni to guarantee the two-phase proportion of weld metal.Meanwhile passing through
Thermal weld stress is controlled to control weld metal and welding heat affected zone（HAZ）Two-phase proportion, and avoid the analysis of harmful phase
Out.And for tubulation industry, it would be desirable that use efficient, the inexpensive argon tungsten-arc welding not filled silk（TIG）.S32750 is super double
Alloy content of the weld seam of phase stainless steel welded pipe after overfill N is identical as base material, but the mechanical property of as-cast structure is stitched from melting welding
It is still poor compared to the mill-annealed tissue of base material, easily there is the case where welding joint mechanical property is lower than base material.
Summary of the invention
In order to overcome existing S32750 super-duplex stainless steel welded tube welding method above-mentioned shortcoming, the present invention mentions
For a kind of welding method of S32750 super-duplex stainless steel welded tube that welded tube longitudinal joint intensity is high, welded using the present invention
The intensity of S32750 two phase stainless steel welded tube longitudinal seam, greater than the intensity of S32750 two phase stainless steel welded tube base material.
The weight percent of S32750 super-duplex stainless steel ingredient of the present invention is：
The Cr of < S≤0.020% of the < P of the < Mn of the < Si of 0 < C≤0.030% 0≤0.80% 0≤1.20% 0≤0.035% 0：
24.00%~26.00%, Ni：6.00%~8.00%, Mo：3.00%~5.00%, N：0.24%~0.32%, remaining
For iron and inevitable impurity.
The step of welding method of this S32750 super-duplex stainless steel welded tube is next coming in order：
I installs a pair of of briquetting roller additional on argon tungsten-arc welding production line, and briquetting roller has arc-shaped forming tank, the radius of grooving
It is equal with the radius of steel pipe；The forming tank of two briquetting rollers is clipped in the two sides of steel pipe；Steel pipe drives briquetting roller rotation.
II welding gun welds groove to be welded in the top of steel pipe, after welding pool is formed, finds tungsten argon arc using thermal imaging system
The molten bath rear end of weldering, the region that temperature is 800 ~ 1200 DEG C, and by briquetting roller center, that is, two forming wheel center line, it adjusts
The mobile so far region of section.
III adjustment the distance between two briquetting rollers, to being squeezed in the range areas of 800 ~ 1200 DEG C of molten bath rear end,
Make protrusion control in weld seam upper surface after extruding to the 5% ~ 20% of thickness of steel pipe, to increase the sectional area of weld seam.
The welding method of above-mentioned S32750 super-duplex stainless steel welded tube, it is characterized in that：In step II, thermal imagery used
Instrument is fluke TiX640 thermal imaging system.
Advantageous effect of the invention
The present invention passes through the extruding at Welded Pipe longitudinal seam, so that the 5 ~ 20% of weld seam upper surface protrusion mother metal thickness, lower surface
Also weld seam mechanical property is improved so that section of weld joint product increases by 10% or more relative to base material in the 5 ~ 20% of respective bump mother metal thickness
Can, so that the bearing capacity of weld seam is higher than base material, so that welded tube be protected not to be broken prior to base material when loaded.Method of the present invention
It can be realized by installing briquetting roller additional from molten welded pipe product line in TIG, it is easy to operate, it is economical and practical.
Detailed description of the invention
Fig. 1 is the schematic front view of embodiment.
Fig. 2 is embodiment every the schematic top plan view for crossing welding gun.
In above-mentioned figure
1. briquetting roller, 2. forming tanks, 3. steel pipes, 4. weld seams, 5. welding guns, 6. protrusions, 7.800 DEG C of thermoisopleths, 8. molten baths, 9. to
Weld groove.
Specific embodiment
By embodiment and its Detailed description of the invention a specific embodiment of the invention, but a specific embodiment of the invention is unlimited
In embodiment disclosed below.
Embodiment
The weight percent of the chemical component of the S32750 super-duplex stainless steel of the present embodiment is：
C：0.023% Si：0.55% Mn：0.95% P：0.021% S：0.001% Cr：25.23% Ni：7.04%
Mo：4.11% N：0.2547%, remaining is Fe and inevitable impurity.
The present embodiment be welding be diameter of phi 150mm, the steel 3 of 1.2mm thickness.Material used is S32750 super double
Phase stainless steel belt, operating procedure are as follows：
I installs a pair of of briquetting roller 1 additional on argon tungsten-arc welding production line, and briquetting roller 1 has arc-shaped forming tank 2, grooving 2
Radius R75mm, is shown in Fig. 1 and Fig. 2.The forming tank 2 of two briquetting rollers 1 is clipped in the two sides of steel pipe 3；Steel pipe 3 into Fig. 2 along arrow
Direction movement is moved downwards, and steel pipe 3 drives briquetting roller 1 to rotate；
II welding gun 6 welds groove 9 to be welded after welding pool 8 is formed in the top of steel pipe 3 and uses fluke TiX640 thermal imaging system
8 rear end of molten bath of argon tungsten-arc welding is found, temperature is 800 ~ 1200 DEG C of region, and by 1 center of briquetting roller, that is, two forming
The line at 1 center is taken turns, mobile so far region is adjusted.
III adjustment the distance between two briquetting rollers 1, to being squeezed in the range areas of 800 ~ 1200 DEG C of 8 rear end in molten bath,
Make 4 upper surface protrusion of weld seam control after extruding to the 18% of 3 wall thickness of steel pipe.
The distance between two step I of the invention, step II and adjustment briquetting rollers are repeated, to the molten bath rear end of steel pipe 3
It is squeezed in 800 ~ 1200 DEG C of range areas, makes weld seam upper surface protrusion after extruding, to increase the sectional area of weld seam.It does
Test of many times is divided into three groups.Making weld seam upper surface protrusion respectively is 5% or less, 5 ~ 20% and 20% or more of 3 wall thickness of steel pipe, such as
Shown in Fig. 1.The present invention chooses 5% ~ 20% that weld seam upper surface protrusion is 3 wall thickness of steel pipe.Weld properties are improved, steel pipe 3 is made
In flaring test constantly in weld seam.
After the completion of above-mentioned welding, Welded Joints carry out the flaring performance detection perpendicular to weld seam.It the results are shown in Table 1：
Table 1
| Test specimen number | Upper surface height of projection（mm） | Fracture position |
| 1 | 0.04 | Weld pipe mill |
| 2 | 0.18 | Base material |
| 3 | 0.30 | Toe of weld |
To Coiling Welded Pipe thickness 1.2mm,
Number 1 height of projection 0.04mm, 0.04/1.2<5%, squeezing effect is bad, breaks in weld seam.
Number 2 height of projection 0.18mm, 0.18/1.2 are exactly between 5 ~ 20%, and effect is good, breaks in base material
Number 3 height of projection 0.30mm, 0.30/1.2>20%, effect is bad, breaks in toe of weld.
Claims (2)
1. a kind of welding method of S32750 super-duplex stainless steel welded tube, it include the steps that it is following successively：
I installs a pair of of briquetting roller additional on argon tungsten-arc welding production line, and briquetting roller has arc-shaped forming tank, the radius of grooving
It is equal with the radius of steel pipe；The forming tank of two briquetting rollers is clipped in the two sides of steel pipe；Steel pipe drives briquetting roller rotation；
II welding gun welds groove to be welded in the top of steel pipe, after welding pool is formed, finds argon tungsten-arc welding using thermal imaging system
Molten bath rear end, the region that temperature is 800 ~ 1200 DEG C, and by the line at two briquetting roller centers, adjust mobile so far region；
The distance between III two briquetting rollers of adjustment, to squeezing in the range areas of 800 ~ 1200 DEG C of molten bath rear end, make to squeeze
Weld seam upper surface protrusion after pressure is controlled to the 5% ~ 20% of thickness of steel pipe, to increase the sectional area of weld seam.
2. the welding method of S32750 super-duplex stainless steel welded tube according to claim 1, it is characterized in that：Step II
In, thermal imaging system used is fluke TiX640 thermal imaging system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810686899.5A CN108890087A (en) | 2018-06-28 | 2018-06-28 | A kind of welding method of S32750 super-duplex stainless steel welded tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810686899.5A CN108890087A (en) | 2018-06-28 | 2018-06-28 | A kind of welding method of S32750 super-duplex stainless steel welded tube |
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| CN108890087A true CN108890087A (en) | 2018-11-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110238485A (en) * | 2019-05-14 | 2019-09-17 | 江苏圣珀新材料科技有限公司 | A kind of welding method of tubular material inside weld |
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|---|---|---|---|---|
| JPH03133575A (en) * | 1989-07-24 | 1991-06-06 | Kawasaki Heavy Ind Ltd | Continuous manufacture and equipment for metallic welded pipe combining high-frequency preheating with high density energy melting and welding process |
| JPH04182070A (en) * | 1990-11-15 | 1992-06-29 | Nisshin Steel Co Ltd | Bead thickness control method for thin-walled welded pipe |
| CN2647496Y (en) * | 2003-08-05 | 2004-10-13 | 攀钢集团钢城企业总公司冷弯型钢厂 | Welding extruding device for welding pipe |
| CN201151041Y (en) * | 2008-01-29 | 2008-11-19 | 上海华钢不锈钢有限公司 | Device for compactly extruding brazing seam of welded tube |
| KR100994986B1 (en) * | 2010-10-26 | 2010-11-17 | 박영기 | Pipe welding device and method thereof |
| CN102962560A (en) * | 2012-10-24 | 2013-03-13 | 洛阳双瑞精铸钛业有限公司 | Welding method of titanium welded tube for petrochemical engineering |
| CN103470873A (en) * | 2013-09-18 | 2013-12-25 | 无锡天龙钢管有限公司 | Special steel pipe for CO2 (carbon dioxide) air conditioner compressor casing and processing process of special steel pipe |
| CN104388663A (en) * | 2014-11-21 | 2015-03-04 | 宝鸡石油钢管有限责任公司 | Thermomechanical treatment method of tube longitudinal welding seam |
| CN104607773A (en) * | 2014-12-11 | 2015-05-13 | 云南昆钢新型复合材料开发有限公司 | Tubulation welding method of stainless steel outer composite tube |
| CN104625366A (en) * | 2015-01-08 | 2015-05-20 | 上海昕良不锈钢管业有限公司 | Pipe welding unit welding device |
-
2018
- 2018-06-28 CN CN201810686899.5A patent/CN108890087A/en active Pending
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|---|---|---|---|---|
| JPH03133575A (en) * | 1989-07-24 | 1991-06-06 | Kawasaki Heavy Ind Ltd | Continuous manufacture and equipment for metallic welded pipe combining high-frequency preheating with high density energy melting and welding process |
| JPH04182070A (en) * | 1990-11-15 | 1992-06-29 | Nisshin Steel Co Ltd | Bead thickness control method for thin-walled welded pipe |
| CN2647496Y (en) * | 2003-08-05 | 2004-10-13 | 攀钢集团钢城企业总公司冷弯型钢厂 | Welding extruding device for welding pipe |
| CN201151041Y (en) * | 2008-01-29 | 2008-11-19 | 上海华钢不锈钢有限公司 | Device for compactly extruding brazing seam of welded tube |
| KR100994986B1 (en) * | 2010-10-26 | 2010-11-17 | 박영기 | Pipe welding device and method thereof |
| CN102962560A (en) * | 2012-10-24 | 2013-03-13 | 洛阳双瑞精铸钛业有限公司 | Welding method of titanium welded tube for petrochemical engineering |
| CN103470873A (en) * | 2013-09-18 | 2013-12-25 | 无锡天龙钢管有限公司 | Special steel pipe for CO2 (carbon dioxide) air conditioner compressor casing and processing process of special steel pipe |
| CN104388663A (en) * | 2014-11-21 | 2015-03-04 | 宝鸡石油钢管有限责任公司 | Thermomechanical treatment method of tube longitudinal welding seam |
| CN104607773A (en) * | 2014-12-11 | 2015-05-13 | 云南昆钢新型复合材料开发有限公司 | Tubulation welding method of stainless steel outer composite tube |
| CN104625366A (en) * | 2015-01-08 | 2015-05-20 | 上海昕良不锈钢管业有限公司 | Pipe welding unit welding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110238485A (en) * | 2019-05-14 | 2019-09-17 | 江苏圣珀新材料科技有限公司 | A kind of welding method of tubular material inside weld |
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Application publication date: 20181127 |
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