CN1190037A - Residual stress eliminating method for welding seam in welded thin-wall pipe - Google Patents
Residual stress eliminating method for welding seam in welded thin-wall pipe Download PDFInfo
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- CN1190037A CN1190037A CN98104987A CN98104987A CN1190037A CN 1190037 A CN1190037 A CN 1190037A CN 98104987 A CN98104987 A CN 98104987A CN 98104987 A CN98104987 A CN 98104987A CN 1190037 A CN1190037 A CN 1190037A
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Abstract
By utilizing a pair of combined rolling wheel and rolling spindle with proper curvature corresponding to the pipe to extract downward pressure at the welding seam area, the welding seam area produces continuous plastic deformation and residual drawing stress is changed into pressure stress. This can improve greatly the internal quality of welding seam area, raise effectively the stress corrosion resistance and anti-fatigue capacity of welded thin-wall pipe, and raise the roughness grade of welding seam.
Description
The invention belongs to the processing method of weld seam, be specifically related to a kind of method of eliminating the welding seam in welded thin-wall pipe residual stress.
The process that is used to both at home and abroad at present to eliminate or reduces the welded tube weld residual stress roughly has following several: (1) integral high-temperature tempering, the tempering of (2) localized hyperthermia, (3) mechanical stretching method, (4) thermal tension method, (5) vibratory drilling method.These methods all have its advantage, also have certain limitation simultaneously.High tempering can eliminate stress or reduce stress, but is difficult to accomplish weld seam and base metal non-oxidation.Mechanical stretching method, thermal tension method and vibratory drilling method owing to equipment complexity, cost height, are promoted the use of and are limited to.
In addition, the method for some rectification welding deformation also can play the effect that eliminates stress.A kind of " thin-wall part weld seam pointwise extruding straightening method and device " disclosed as Chinese patent CN86108866A, this method adopts the identical a pair of cylindrical pressure head in center, weld seam or nearly seam district to orthopedic workpiece impose quiet extruding force pointwise extruding, when the local contraction that welding is caused is orthopedic, also can eliminate the part welding stress.But required static pressure is higher, for aluminium alloy element or plane institution movement still can, if it is relatively poor to be used for other metalwork effect, particularly just more inapplicable for the thin-walled welding pipe of the coherence request strictness of eliminating welding stress.Therefore, orthopedic after this method generally also only is used to weld.
Thin-walled welding pipe for the special occasions use, as the stainless steel thin-wall welded tube of using on the nuclear power plant equipment, anticorrosion and surface roughness there is strict requirement, for the ability that improves the product stress corrosion resistant must guarantee the product welding residual stress is compression, and the domestic various processes that adopt all can't be guaranteed at present.
At above situation, the present invention proposes a kind of method of new elimination welding seam in welded thin-wall pipe residual stress, is intended to strengthen stress corrosion resistant ability, the fatigue resistance of welded seam area, and the roughness grade number that improves face of weld.
Technical solution of the present invention is: a pair of combination rolling wheel set and the roll-in supporting mandrel that adopt curved surface, radius of curvature to adapt with the pipe fitting radius, pipe fitting weld metal zone and nearly weld metal zone are applied vertically downward pressure, rolling wheel set is the weld seam uniform roll longitudinally, make the positive and negative profile uniform-compression that is welded into of weld seam produce plastic deformation, make welding vestige stress become compression, finally make welded seam area obtain the same smooth even curface with the matrix mother metal.
It is P=KF σ that the roller pressure that is adopted calculates empirical equation
3
Wherein: P---roller pressure (kgf)
K---coefficient gets 2～3
F---roll-in weld seam contact area (mm
2)
σ
3---material yield intensity (kgf/mm
2)
The rolling wheel set concave curved surface changes with the thin-wall pipe radius is different with supporting mandrel convex surface radius of curvature in this method.General supporting mandrel convex surface radius is got the pipe fitting radius, and rolling wheel set concave curved surface radius is got 1.1～1.5 times of pipe fitting radius.Roller diameter and supporting mandrel's diameter then calculate respectively according to tube wall thickness, pipe fitting length, satisfy the intensity and toughness requirement and get final product to guarantee roller, mandrel.
Further describe the present invention below in conjunction with drawings and Examples:
Fig. 1 is a roll-in principle schematic of the present invention;
Fig. 2 is the side view of Fig. 1.
Wherein: 1, rolling wheel set 2, supporting mandrel 3, weld-end fittings
Require to make the thin-walled welding pipe of φ 284 * 2 * 4300, φ 289 * 0.8 * 3800A, two kinds of specifications of B in the nuclear power plant equipment, specification requirement is high, the imported product quotation is expensive, the domestic process that does not have maturation again, and we have successfully made above-mentioned stainless steel thin-wall welded tube to adopt the present invention.
During making, at first weld-end fittings 3 supportings are got up, and make the pipe fitting weld seam vertically upward by supporting mandrel 2.By rolling wheel set 1 to weld seam apply vertically downward pressure and along the bead direction roll-in.Rolling wheel set, the heat treatment hardness HRC58 of supporting mandrel～62, rolling wheel set longitudinally weld movement speed are 0～4m/min, and the roll-in selection of times scope of each workpiece is 1～4 time, and roller pressure A manages P=11064kgf, and B manages P=9220kgf.Make the complex stress in pipe fitting welded seam area or nearly seam zone become compression by continuous rolling, thereby eliminate the welded tube welding residual stress effectively, improve the stress corrosion resistant ability and the fatigue resistance of thin-walled welding pipe.
After tested, according to the thin walled welds pipe that this method is handled, the face of weld roughness grade number can reach the 2B surface quality among the GB3280-92; The stress corrosion resistant ability meets GB4334.5-84 weld seam corrosion resistance test standard; The comparable preceding raising about 25% of being untreated of fatigue resistance, product quality reaches standard-required fully, can compare with imported product fully.
Process of the present invention successfully applies to the production of thin-walled welding pipe, makes thin-walled weldering in the nuclear power plant equipment Jointed tubular workpieces is become domestic by import, saved a large amount of foreign exchanges, obtains significant Social benefit and economic benefit. Major advantage of the present invention is:
1, welding vestige stress is become compression, greatly improved the inherent quality of welded seam area, can Satisfy the thin-walled welding pipe great surface quality of different size, material and purposes, the requirement of high anti-stress-corrosion ability.
2, process is simple, applied widely, production efficiency is high.
3, equipment investment is few, processing cost is low, good product quality.
Claims (4)
1, a kind of method of eliminating the welding seam in welded thin-wall pipe residual stress, it is characterized in that a pair of combination rolling wheel set and the roll-in supporting mandrel that adopt curved surface, radius of curvature to adapt with the pipe fitting radius, pipe fitting weld metal zone and nearly weld metal zone are applied vertically downward pressure, rolling wheel set is the weld seam uniform roll longitudinally, make the positive and negative profile uniform-compression that is welded into of weld seam produce plastic deformation, make welding vestige stress become compression, finally make welded seam area obtain the same smooth even curface with the matrix mother metal, it is P=KF σ that the roller pressure that is adopted calculates empirical equation
3
Wherein: P---roller pressure (kgf)
K---coefficient gets 2～3
F---roll-in weld seam contact area (mm
2)
σ
3---material yield intensity (kgf/mm
2)
2, the method for elimination welding seam in welded thin-wall pipe residual stress according to claim 1 is characterized in that supporting mandrel's convex surface radius gets the pipe fitting radius, and rolling wheel set concave curved surface radius is got 1.1～1.5 times of pipe fitting radius.
3, the method for elimination welding seam in welded thin-wall pipe residual stress according to claim 1, it is characterized in that rolling wheel set longitudinally weld movement speed be 0～4m/min.
4, the method for elimination welding seam in welded thin-wall pipe residual stress according to claim 1 is characterized in that the roll-in selection of times scope of each workpiece is 1～4 time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98104987A CN1057482C (en) | 1998-02-11 | 1998-02-11 | Residual stress eliminating method for welding seam in welded thin-wall pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98104987A CN1057482C (en) | 1998-02-11 | 1998-02-11 | Residual stress eliminating method for welding seam in welded thin-wall pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1190037A true CN1190037A (en) | 1998-08-12 |
| CN1057482C CN1057482C (en) | 2000-10-18 |
Family
ID=5218616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98104987A Expired - Lifetime CN1057482C (en) | 1998-02-11 | 1998-02-11 | Residual stress eliminating method for welding seam in welded thin-wall pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1057482C (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100406190C (en) * | 2001-11-02 | 2008-07-30 | 波音公司 | Apparatus and method for forming weld joints having compressive residual stress patterns |
| CN102528410A (en) * | 2011-11-07 | 2012-07-04 | 杭州钻虎金刚石工具有限公司 | Process for manufacturing base body of engineering thin-walled drill |
| CN103017955A (en) * | 2012-11-29 | 2013-04-03 | 北京理工大学 | Manufacturing process and protection method for constant value residual stress welding test piece |
| CN103551425A (en) * | 2013-10-23 | 2014-02-05 | 沈阳黎明航空发动机(集团)有限责任公司 | Deformation correcting method of circumferential weld of thin-wall titanium alloy welding casing |
| CN104097019A (en) * | 2014-07-08 | 2014-10-15 | 河南理工大学 | Fixture for laser welding machine for large-diameter thin-walled parts |
| CN107557549A (en) * | 2017-10-19 | 2018-01-09 | 吴谦 | A kind of method for eliminating welding residual stress |
| CN108817622A (en) * | 2018-08-13 | 2018-11-16 | 南京工程学院 | Ultrasonic electric arc fitting rolling thin-wall steel tube welder and welding method |
| CN109940568A (en) * | 2019-05-05 | 2019-06-28 | 南通普瑞特机械有限公司 | A kind of rectangular tube repair platform |
| CN110724889A (en) * | 2019-09-24 | 2020-01-24 | 徐州轩辕铝业有限公司 | Device for eliminating stress of aluminum alloy pipe |
| CN111187892A (en) * | 2019-12-31 | 2020-05-22 | 东莞材料基因高等理工研究院 | Process for reducing residual stress of butt weld of dissimilar metal thick-wall cylinder |
| CN113909678A (en) * | 2021-11-18 | 2022-01-11 | 哈焊国创(青岛)焊接工程创新中心有限公司 | Welding system for aluminum alloy laser welding and surface treatment method |
| CN114043227A (en) * | 2021-12-13 | 2022-02-15 | 天津大学 | Mechanical rolling device and method for strengthening root of friction stir welding seam |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU764765A1 (en) * | 1976-04-01 | 1980-09-23 | Институт Электросварки Им. Е.О.Патона Ан Украинской Сср | Apparatus for welding straight-seam tubes |
| CN1019510B (en) * | 1989-03-30 | 1992-12-16 | 营口盐场 | A kind of method for annealing of eliminating unrelieved stress in the steel |
| DE4124689A1 (en) * | 1991-07-22 | 1993-01-28 | Mannesmann Ag | Removing form errors and relieving adverse internal stresses in longitudinal seam welded pipes - by continuous expansion with internal expander plug and plug mandrel |
-
1998
- 1998-02-11 CN CN98104987A patent/CN1057482C/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100406190C (en) * | 2001-11-02 | 2008-07-30 | 波音公司 | Apparatus and method for forming weld joints having compressive residual stress patterns |
| CN102528410A (en) * | 2011-11-07 | 2012-07-04 | 杭州钻虎金刚石工具有限公司 | Process for manufacturing base body of engineering thin-walled drill |
| CN102528410B (en) * | 2011-11-07 | 2014-07-16 | 杭州钻虎金刚石工具有限公司 | Process for manufacturing base body of engineering thin-walled drill |
| CN103017955A (en) * | 2012-11-29 | 2013-04-03 | 北京理工大学 | Manufacturing process and protection method for constant value residual stress welding test piece |
| CN103551425A (en) * | 2013-10-23 | 2014-02-05 | 沈阳黎明航空发动机(集团)有限责任公司 | Deformation correcting method of circumferential weld of thin-wall titanium alloy welding casing |
| CN103551425B (en) * | 2013-10-23 | 2015-04-08 | 沈阳黎明航空发动机(集团)有限责任公司 | Deformation correcting method of circumferential weld of thin-wall titanium alloy welding casing |
| CN104097019A (en) * | 2014-07-08 | 2014-10-15 | 河南理工大学 | Fixture for laser welding machine for large-diameter thin-walled parts |
| CN104097019B (en) * | 2014-07-08 | 2016-03-30 | 河南理工大学 | Large-diameter thin-wall piece laser weld machine clamp |
| CN107557549A (en) * | 2017-10-19 | 2018-01-09 | 吴谦 | A kind of method for eliminating welding residual stress |
| CN108817622A (en) * | 2018-08-13 | 2018-11-16 | 南京工程学院 | Ultrasonic electric arc fitting rolling thin-wall steel tube welder and welding method |
| CN108817622B (en) * | 2018-08-13 | 2020-11-24 | 南京工程学院 | Ultrasonic arc laminating and rolling thin-wall steel pipe welding device and welding method |
| CN109940568A (en) * | 2019-05-05 | 2019-06-28 | 南通普瑞特机械有限公司 | A kind of rectangular tube repair platform |
| CN110724889A (en) * | 2019-09-24 | 2020-01-24 | 徐州轩辕铝业有限公司 | Device for eliminating stress of aluminum alloy pipe |
| CN111187892A (en) * | 2019-12-31 | 2020-05-22 | 东莞材料基因高等理工研究院 | Process for reducing residual stress of butt weld of dissimilar metal thick-wall cylinder |
| CN113909678A (en) * | 2021-11-18 | 2022-01-11 | 哈焊国创(青岛)焊接工程创新中心有限公司 | Welding system for aluminum alloy laser welding and surface treatment method |
| CN114043227A (en) * | 2021-12-13 | 2022-02-15 | 天津大学 | Mechanical rolling device and method for strengthening root of friction stir welding seam |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1057482C (en) | 2000-10-18 |
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Effective date of registration: 20170818 Address after: 030800 No. 108, 66 National Road, Taigu County, Jinzhong, Shanxi Patentee after: Shanxi Zhongtong High-Tech Co.,Ltd. Address before: Is the host of 030800 Shanxi County of Taigu province Shanxi No. 101 Tong Industrial and Trading Company high technology consulting firm Patentee before: Wang Baodong |
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Granted publication date: 20001018 |
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