CN104526134A - Method for removing surplus height of seam of submerge-arc welded steel pipe - Google Patents
Method for removing surplus height of seam of submerge-arc welded steel pipe Download PDFInfo
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- CN104526134A CN104526134A CN201410645573.XA CN201410645573A CN104526134A CN 104526134 A CN104526134 A CN 104526134A CN 201410645573 A CN201410645573 A CN 201410645573A CN 104526134 A CN104526134 A CN 104526134A
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- cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
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Abstract
The invention discloses a method for removing a surplus height of a seam of a submerge-arc welded steel pipe. A cutting wire is used for cutting a metal in the position of viscous-state seam surplus height, wherein the cutting speed of the cutting wire is controlled in cutting, so that the cutting wire can cut the metal in the position of viscous-state seam surplus height; and the distance between the cutting wire and a submerged-arc welding molten pool is controlled to keep the metal in the position of seam surplus height in a viscous state and to separate the cut metal in the position of the seam surplus height from the metal retained in the position of seam surplus height. The method uses the high-temperature resisting thin wire for cutting and removing the metal in the position of viscous-state seam surplus height after the submerged-arc welding. The method solves the problems of excessive seam surplus height and influence on subsequent corrosion resistant layer construction quality.
Description
Technical field
The invention belongs to Machining Technology field, particularly relate to a kind of method removing submerged arc welding steel pipe seam reinforcement.
Background technology
To oil-gas transportation steel pipe, in order to ensure the life-span of pipeline, often need to adopt the mode of epoxy powder spraying or 3PE to carry out anti-corrosion treatment to steel pipe.
Submerged-arc welding (containing submerged arc overlay welding and ESW etc.) is that a kind of electric arc burns the method for carrying out welding under welding flux layer, its intrinsic welding quality stable, welding productivity be high, without arc light and the flue dust advantage such as seldom, become the main welding method in the important structure steel fabrications such as pressure vessel, pipeline section manufacture, box beam column.In recent years, although successively occurred that many kinds are efficient, the new welding method of high-quality, the application of submerged-arc welding has not still been affected.From the angle of the deposited metal weight portion of various fusion welding method, submerged-arc welding accounts for about 10%, and change is always little for many years.Submerged-arc welding steel pipe, because the reason of weld reinforcement, can cause the anticorrosive coat thickness of weld seam position anticorrosive coat Thickness Ratio steel pipe matrix thin, and affect anticorrosive coat construction quality.
Weld reinforcement (English name: reinforcement; Excess weld metal) definition be part metal height on face of weld two toe of weld line, its source: JGJ18-2012 reinforcement welding and control of acceptance; Weld reinforcement can play the effect of insulation and slow cooling to whole piece weld seam, to crystal grain thinning, reduce welding stress and play a big part, but it also has the place of its deficiency, as equipment can be caused to form shape sudden change herein, causes stress raisers.Specify in AWS D1.1, the weld reinforcement of butt weld should more than 3mm.And popular saying: reinforcement refer to bloat mother metal surface part or fillet welding end (i.e. toe of weld) connecting line with the deposited metal of upper part.Desirable is difficult to obtain without reinforcement and don't recessed weld seam.Reinforcement is comparatively large, and face of weld is protruding, and transition is not round and smooth, easily causes stress to concentrate, unfavorable to Welding Structure carrying dynamic load, therefore will limit reinforcement size.And reduce the height of weld reinforcement, the thickness difference of commissure and steel pipe matrix place anticorrosive coat can be reduced, ensure anticorrosive coat construction quality; Therefore, need to develop a kind of method can removing submerged arc welding steel pipe seam reinforcement.
Summary of the invention
The object of the present invention is to provide a kind of method removing submerged arc welding steel pipe seam reinforcement, the method is easy to use, and implementation cost is cheap, can ensure anti_corrosion construction quality.
In order to achieve the above object, the technical solution used in the present invention is: adopt the metal of cutting wire to viscous state weld reinforcement place to cut; Wherein, during cutting, the cutting speed controlling cutting wire enables cutting wire cut the metal at viscous state weld reinforcement place; The distance controlled between cutting wire and submerged arc welding molten bath makes the metal at weld reinforcement place remain on viscous state, and the metal at the weld reinforcement place be cut is separated with the metal being retained in weld reinforcement place.
The height of the submerged arc welding steel pipe seam reinforcement after cutting remains on 0 ~ 2.5mm.
The cutting speed of described cutting wire when cutting controls at 0.1 ~ 6m/s.
During cutting, the temperature of cutting wire remains on 0 ~ 100 DEG C.
During cutting, the distance between control cutting wire and submerged arc welding molten bath, at 20 ~ 800mm, remains on weld seam to make the temperature of cutting wire cut place metal and is in liquid-solid conversion temperature district.
The temperature range that described weld seam is in liquid-solid conversion temperature district is 1350 ~ 1550 DEG C.
Described cutting wire is fixed on cutting head, and cutting head is made up of the roller that two are fixed with pole, and cutting wire is around on roller.
Described cutting wire adopts molybdenum filament.
Described weld reinforcement and submerged arc welding molten bath are that welding head produces in submerged arc welding steel pipe process.
Compared with prior art, beneficial effect of the present invention is:
The present invention removes by using the metal of resistant to elevated temperatures cutting wire to the weld reinforcement being still in viscous state after submerged-arc welding to carry out cutting, in cutting process, pass through the control to cutting wire cutting speed simultaneously, the temperature of cutting wire is reduced, ensures that cutting wire cuts the weld reinforcement metal being in high temperature at a proper temperature and has the slight and wearability of enough volumes.In addition, the present invention also controls the distance between cutting wire and submerged arc welding molten bath in cutting process, can cut weld reinforcement open easily to make cutting filament and can separate smoothly between the weld reinforcement cut open with weld seam.The present invention is effectively easy to use, and implementation cost is cheap, can ensure anti_corrosion construction quality.
Accompanying drawing explanation
Fig. 1 is using state figure of the present invention;
Wherein, 1, welding head, 2, submerged arc welding molten bath, 3, submerged-arc welding steel pipe, 4, weld seam, 5, weld reinforcement, 6, cutting head, 7, cutting wire.
Detailed description of the invention
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
See Fig. 1, carrying out submerged arc welding process to steel pipe is: start welding head 1, starts welded still pipe, forms submerged arc welding molten bath 2, forms submerged arc welding steel pipe 3, weld seam 4 and weld reinforcement 5 after cooling;
The present invention uses resistant to elevated temperatures cutting wire 7 (such as the molybdenum filament of similar Linear cut), carries out cutting remove the weld reinforcement 5 (now uncolled) being still in viscous state after submerged-arc welding.
The present invention removes the method for submerged arc welding steel pipe seam reinforcement, comprises following concrete steps:
1) cutting wire 7 is fixed on cutting head 6, and cutting head 6 is made up of the roller that two are fixed with pole, and cutting wire 7 on roller be used for support cutting wire 7;
2) adopt cutting wire 7 to cut with the metal of the mode of rectilinear motion to viscous state weld reinforcement 5 place, in addition, after regulating the height of cutting head 5 to ensure cutting, weld reinforcement remains on 0 ~ 2.5mm.
Wherein, during cutting, the cutting speed controlling cutting wire 7, at 0.1 ~ 6m/s, makes the temperature of cutting wire 7 at 0 ~ 100 DEG C, and such cutting wire just can keep enough intensity and wearability when cutting, thus cuts the metal at viscous state weld reinforcement 5 place smoothly;
Distance between control cutting wire 7 and submerged arc welding molten bath 2 is at 20 ~ 800mm; Make the temperature of the metal at weld reinforcement 5 place in liquid-solid conversion temperature district, namely 1350 ~ 1550 DEG C, thus make the metal at weld reinforcement 5 place remain on viscous state, and the metal at weld reinforcement 5 place be cut is separated with the metal being retained in weld reinforcement 5 place.
The present invention is when butt welded seam reinforcement cuts, filament cutting part used carries out rectilinear motion by certain speed, there is measure to cool filament, ensureing that the temperature of filament can not be too high to ensure that it has enough intensity and wearability when cutting the weld reinforcement being in high temperature.During cutting, cutting filament and submerged arc welding molten bath 2 keep suitable distance, can cut weld reinforcement open easily to make cutting filament and can separate smoothly between the weld reinforcement cut open with weld seam.
Embodiment 1:
1) cutting wire 7 is fixed on cutting head 6, and cutting head 6 is made up of the roller that two are fixed with pole, and cutting wire 7 on roller be used for support cutting wire 7;
2) adopt cutting wire 7 to cut with the metal of the mode of rectilinear motion to viscous state weld reinforcement 5 place, in addition, after regulating the height of cutting head 5 to ensure cutting, weld reinforcement remains on 2.5mm.
Wherein, during cutting, the cutting speed controlling cutting wire 7, at 6m/s, makes the temperature of cutting wire 7 at 100 DEG C, and such cutting wire just can keep enough intensity and wearability when cutting, thus cuts the metal at viscous state weld reinforcement 5 place smoothly;
Distance between control cutting wire 7 and submerged arc welding molten bath 2 is at 500mm; Make the temperature of the metal at weld reinforcement 5 place in liquid-solid conversion temperature district, namely 1350 ~ 1550 DEG C, thus make the metal at weld reinforcement 5 place remain on viscous state, and the metal at weld reinforcement 5 place be cut is separated with the metal being retained in weld reinforcement 5 place.
Embodiment 2:
1) cutting wire 7 is fixed on cutting head 6, and cutting head 6 is made up of the roller that two are fixed with pole, and cutting wire 7 on roller be used for support cutting wire 7;
2) adopt cutting wire 7 to cut with the metal of the mode of rectilinear motion to viscous state weld reinforcement 5 place, in addition, after regulating the height of cutting head 5 to ensure cutting, weld reinforcement remains on 1.0mm.
Wherein, during cutting, the cutting speed controlling cutting wire 7, at 0.1m/s, makes the temperature of cutting wire 7 at 0 DEG C, and such cutting wire just can keep enough intensity and wearability when cutting, thus cuts the metal at viscous state weld reinforcement 5 place smoothly;
Distance between control cutting wire 7 and submerged arc welding molten bath 2 is at 20mm; Make the temperature of the metal at weld reinforcement 5 place in liquid-solid conversion temperature district, namely 1350 ~ 1550 DEG C, thus make the metal at weld reinforcement 5 place remain on viscous state, and the metal at weld reinforcement 5 place be cut is separated with the metal being retained in weld reinforcement 5 place.
Embodiment 3:
1) cutting wire 7 is fixed on cutting head 6, and cutting head 6 is made up of the roller that two are fixed with pole, and cutting wire 7 on roller be used for support cutting wire 7;
2) adopt cutting wire 7 to cut with the metal of the mode of rectilinear motion to viscous state weld reinforcement 5 place, in addition, after regulating the height of cutting head 5 to ensure cutting, weld reinforcement remains on 0mm.
Wherein, during cutting, the cutting speed controlling cutting wire 7, at 3m/s, makes the temperature of cutting wire 7 at 60 DEG C, and such cutting wire just can keep enough intensity and wearability when cutting, thus cuts the metal at viscous state weld reinforcement 5 place smoothly;
Distance between control cutting wire 7 and submerged arc welding molten bath 2 is at 800mm; Make the temperature of the metal at weld reinforcement 5 place in liquid-solid conversion temperature district, namely 1350 ~ 1550 DEG C, thus make the metal at weld reinforcement 5 place remain on viscous state, and the metal at weld reinforcement 5 place be cut is separated with the metal being retained in weld reinforcement 5 place.
The present invention is described in detail in preferred embodiment above by concrete; but those skilled in the art should be understood that; the present invention is not limited to the above embodiment; within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement etc., all should be included within protection scope of the present invention.
Claims (9)
1. remove a method for submerged arc welding steel pipe seam reinforcement, it is characterized in that: adopt cutting wire (7) metal to viscous state weld reinforcement (5) place to cut; Wherein, during cutting, the cutting speed controlling cutting wire (7) makes cutting wire (7) can cut the metal at viscous state weld reinforcement (5) place; The distance controlled between cutting wire (7) and submerged arc welding molten bath (2) makes the metal at weld reinforcement (5) place remain on viscous state, and the metal at weld reinforcement (5) place be cut is separated with the metal being retained in weld reinforcement (5) place.
2. the method for removal submerged arc welding steel pipe seam reinforcement according to claim 1, is characterized in that: the height of the submerged arc welding steel pipe seam reinforcement (5) after cutting remains on 0 ~ 2.5mm.
3. the method for removal submerged arc welding steel pipe seam reinforcement according to claim 1, is characterized in that: the cutting speed of described cutting wire (7) when cutting controls at 0.1 ~ 6m/s.
4. the method for the removal submerged arc welding steel pipe seam reinforcement according to claim 1 or 3, is characterized in that: during cutting, the temperature of cutting wire (7) remains on 0 ~ 100 DEG C.
5. the method for removal submerged arc welding steel pipe seam reinforcement according to claim 1, it is characterized in that: during cutting, distance between control cutting wire (7) and submerged arc welding molten bath (2), at 20 ~ 800mm, remains on weld seam to make the temperature of cutting wire cut place metal and is in liquid-solid conversion temperature district.
6. the method for removal submerged arc welding steel pipe seam reinforcement according to claim 1, is characterized in that: the temperature range that described weld seam is in liquid-solid conversion temperature district is 1350 ~ 1550 DEG C.
7. the method for removal submerged arc welding steel pipe seam reinforcement according to claim 1, it is characterized in that: described cutting wire (7) is fixed on cutting head (6), and cutting head (6) is made up of the roller that two are fixed with pole, and cutting wire (7) is around on roller.
8. the method for the removal submerged arc welding steel pipe seam reinforcement according to claim 1 or 7, is characterized in that: described cutting wire (7) adopts molybdenum filament.
9. the method for removal submerged arc welding steel pipe seam reinforcement according to claim 1, is characterized in that: described weld reinforcement (5) and submerged arc welding molten bath (2) are that welding head (1) produces in submerged arc welding steel pipe process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410645573.XA CN104526134A (en) | 2014-11-11 | 2014-11-11 | Method for removing surplus height of seam of submerge-arc welded steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410645573.XA CN104526134A (en) | 2014-11-11 | 2014-11-11 | Method for removing surplus height of seam of submerge-arc welded steel pipe |
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| CN104526134A true CN104526134A (en) | 2015-04-22 |
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| CN201410645573.XA Pending CN104526134A (en) | 2014-11-11 | 2014-11-11 | Method for removing surplus height of seam of submerge-arc welded steel pipe |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200977552Y (en) * | 2006-12-14 | 2007-11-21 | 中国石化集团南京化学工业有限公司化工机械厂 | Device for processing butt-joint pipe weld seam reinforcement |
| CN101934446A (en) * | 2010-08-27 | 2011-01-05 | 宝莱不锈钢科技(昆山)有限公司 | Flattening device for welding seam of welded pipe |
| CN202655772U (en) * | 2012-05-18 | 2013-01-09 | 沈阳飞机工业（集团）有限公司 | Automatic argon welding device |
| JP5120131B2 (en) * | 2008-07-31 | 2013-01-16 | Ｊｆｅスチール株式会社 | Multi-electrode submerged arc welding method |
| CN103624383A (en) * | 2013-12-10 | 2014-03-12 | 北京隆盛泰科石油管科技有限公司 | Welding seam weld reinforcement control device for welding steel pipe |
-
2014
- 2014-11-11 CN CN201410645573.XA patent/CN104526134A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200977552Y (en) * | 2006-12-14 | 2007-11-21 | 中国石化集团南京化学工业有限公司化工机械厂 | Device for processing butt-joint pipe weld seam reinforcement |
| JP5120131B2 (en) * | 2008-07-31 | 2013-01-16 | Ｊｆｅスチール株式会社 | Multi-electrode submerged arc welding method |
| CN101934446A (en) * | 2010-08-27 | 2011-01-05 | 宝莱不锈钢科技(昆山)有限公司 | Flattening device for welding seam of welded pipe |
| CN202655772U (en) * | 2012-05-18 | 2013-01-09 | 沈阳飞机工业（集团）有限公司 | Automatic argon welding device |
| CN103624383A (en) * | 2013-12-10 | 2014-03-12 | 北京隆盛泰科石油管科技有限公司 | Welding seam weld reinforcement control device for welding steel pipe |
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Application publication date: 20150422 |
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