CN104439672A - High frequency prewelding technology of longitudinal submerged arc welded pipe - Google Patents
High frequency prewelding technology of longitudinal submerged arc welded pipe Download PDFInfo
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- CN104439672A CN104439672A CN201410642797.5A CN201410642797A CN104439672A CN 104439672 A CN104439672 A CN 104439672A CN 201410642797 A CN201410642797 A CN 201410642797A CN 104439672 A CN104439672 A CN 104439672A
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- high frequency
- prewelding
- welding
- steel pipe
- submerged arc
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
-
- 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
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
- B23K13/025—Seam welding for 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Abstract
The invention discloses a high frequency prewelding technology of a longitudinal submerged arc welded pipe. The high frequency prewelding technology of the longitudinal submerged arc welded pipe comprises the following steps: (1) strip steel raw material is delivered to a molding unit for molding processing; (2) prewelding processing is carried out on a steel pipe subjected to molding processing in the step (1), high frequency welding is adopted as the welding manner in prewelding processing, and the steel pipe subjected to frequency welding processing is divided into a plurality of fixed-length pipe bodies; (3) inside submerged arc welding processing and outside submerged arc welding processing are carried out on the fixed-length pipe bodies in the step (2). By means of the technical scheme, the prewelding is conducted on the steel pipe in a high frequency prewelding mode, and production efficiency can be effectively improved. In addition, because no filler metal is involved in a high frequency prewelding process, the purpose of welding is achieved depending on the heating and the pressurization to the edge of steel coil raw material, accordingly generation of arc light can be avoided, and because gas is not used in a high frequency welding process, the cost of material is reduced and the welding environment is improved.
Description
Technical field
The present invention relates to a kind of welding procedure of metal, especially a kind of high frequency tack welding process of straight-line joint submerged arc welding tube.
Background technology
Straight-line joint submerged arc welding tube is widely used in the oil in land and seabed, natural gas, petrochemical industry, mining, electric power, infrastructure project, the field such as steel construction and water supply.The manufacture that straight-line joint submerged arc welding tube is conventional has UOE, JCOE, RBE, HME, COE etc., be suitable for the production of middle major diameter, high material, thick walled steel tube, because raw material adopt steel plate, improve the performance of material by rolling mill practice etc., therefore the performance of steel pipe is more excellent.
The general technology flow process of conventional oil-gas transportation longitudinal submerged arc welded pipe includes: carry out detection and preliminary processing and forming to band steel raw material, and carry out prewelding process to the steel pipe of first-stage success; After completing above-mentioned steps, by outside weld and late detection in the submerged arc of steel pipe, to complete the processing process of steel pipe.
In straight-line joint submerged arc welding tube production process, prewelding, namely tack welding is its critical process, and whether the quality of prewelding quality is directly connected to the quality of final weld seam and steel pipe.In GB/T9711-2011 " industrial gas oil pipeline delivery system steel pipe " 8.4 clauses, specify that acceptable prewelding mode has semiautomatic submerged arc welding (SAW), gas metal-arc welding (GMAW), flux cored wire arc welding (FCAW), low-hydrogen electrode arc welding (SMAW), electric resistance welding, Laser Welding totally six kinds of modes.At home and abroad in straight-line joint submerged arc welding tube production process, using maximum, the most ripe mode to be automatic gas metal-arc welding (GMAW) prewelding continuously, mainly there is following shortcoming in this mode:
In GMAW prewelding process, pre-weld seam easily produces the defect such as pore, current interruption, and simultaneously pre-postwelding exists certain gap, and part producer pipe end can not prewelding continuously, therefore prewelding and current interruption position can not must adopt manual repair welding, to ensure the welding quality of interior weldering;
Owing to adopting gas shield in welding process, therefore can produce a large amount of gas flue dust, GMAW belongs to arc welding simultaneously, also can produce a large amount of arc lights, have a strong impact on the environment in operating environment and workshop;
Owing to existing, above problem is rear inside and outside submerged arc easily produces its more defect such as hole, slag inclusion of gas, especially more outstanding at welding light-wall pipe pore, dreg defect, even domestic producers weld the modes such as grade, mariages in the first outer postwelding of employing and go to reduce ratio of defects in welding thin-walled submerged-arc welded (SAW) pipe process, also become a technical barrier;
Need filler wire in welding process, a large amount of wldings need be consumed every year;
Speed of welding low (general≤4.0m/min), steel pipe's production efficiency is low;
Prewelding edges of boards bevel clean degree requires high.
For above-mentioned technology problem, adopt the mode of automatic gas metal-arc welding to carry out soldering to straight-line joint submerged arc welding tube and be difficult to make steel pipe, and the quality of weld seam is further improved, and then affected the application of steel pipe.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of tack welding process of straight-line joint submerged arc welding tube, and it effectively can improve the welding quality of straight-line joint submerged arc welding tube in prewelding process.
For solving the problems of the technologies described above, the present invention relates to a kind of high frequency tack welding process of straight-line joint submerged arc welding tube, it includes following steps:
1) processing and forming process is carried out by band steel feedstock transportation to shaping machine set;
2) carry out prewelding process to the steel pipe completing processing and forming process in step 1), its welding manner adopted is high-frequency welding, and the steel pipe completing the process of high frequency prewelding is partitioned into multiple scale body;
3) to step 2) in scale body carry out the submerged arc welding process of inner and outer respectively.
As a modification of the present invention, in described step 1), band steel raw material adopts coil of strip, and it adopts the mode of monovolume material loading by coil of strip feedstock transportation to shaping machine set.Adopt such scheme; it passes through coil of strip as raw material; the cost of steel pipe is effectively controlled; simultaneously; its mode by monovolume material loading realizes the continuous prewelding of multiple coil of strip, avoids occurring in welding process shutting down thus affecting efficiency, and can in the prewelding process of steel pipe; avoid occurring gap and cause the defect such as pore, slag inclusion, and then effectively improve lumber recovery.
As a modification of the present invention, in described step 1), before processing and forming process is carried out to band steel raw material, the process of milling limit need be carried out to band steel.Adopt such scheme, it makes band steel edge form the tangent plane of certain angle by the process of milling limit, thus makes to be with steel follow-up shaping with welding process, and its connecting portion can form double V-groove, and then ensure that the pattern coefficient of weld reinforcement and weld seam, effectively improve the quality of welding.
As a modification of the present invention, described step 2) in, concrete grammar steel pipe being carried out to the process of high-frequency welding prewelding is:
2.1) by high frequency induction heater, steel pipe is heated, make the edges of boards position of steel pipe reach plastic period;
2.2) pressurized treatments is carried out to the steel pipe edges of boards being in plastic deformation deformation stage;
2.3) to being in step 2.1) with step 2.2) in heat and pressurized treatments in steel pipe edges of boards carry out prewelding process;
2.4) to step 2.3) in complete prewelding process steel pipe carry out cooling processing.
Adopt such scheme, it is by carrying out high-frequency heating to steel pipe, make the high-frequency induction that the heating part of steel pipe produces, due to kindred effect and the kelvin effect of high-frequency induction, it makes heat concentrate on the weld seam angular aperture position of steel pipe, i.e. the joint place of steel pipe edges of boards, simultaneously, it carries out pressurized treatments by many steel pipes, adopts the soldering mode of heating pressurization, effectively improves the welding precision to steel pipe and welding efficiency.
As a modification of the present invention, described step 2) in, after completing the segmentation of multiple scale body, interior mill processing of rust removing need be carried out to each scale body.Owing to there is the intervention of cooling water in high-frequency welding process, so steel pipe weld joint on inner side has more floating rust; Adopt such scheme, it is by interior mill processing of rust removing, effectively eliminates the floating rust of steel duct, thus guarantees that it can not affect follow-up submerged-arc welding process.
As a modification of the present invention, in described step 3), before scale body being carried out respectively to the submerged arc welding process of inner and outer, arc-extinguishing plate need be drawn in the welding of the commissure of steel pipe.
Adopt the high frequency tack welding process of the straight-line joint submerged arc welding tube of technique scheme, it adopts the mode of high frequency prewelding to carry out the prewelding of steel pipe, and it effectively can improve production efficiency; Meanwhile, owing to staying out of filling metal in high frequency prewelding process, rely on the edge heating to coil of strip raw material and the object reaching welding of pressurizeing, thus avoid the generation of arc light, further, in high-frequency welding process, also gas is not used, so improve welding surroundings while saving material cost.
Accompanying drawing explanation
Fig. 1 is coil of strip milling limit schematic diagram in the present invention;
Fig. 2 is medium-high frequency prewelding shaping schematic view of the present invention.
Detailed description of the invention
Below in conjunction with detailed description of the invention, illustrate the present invention further, following detailed description of the invention should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.It should be noted that, the word "front", "rear" of use is described below, "left", "right", "up" and "down" refer to direction in accompanying drawing, word " interior " and " outward " refer to the direction towards or away from particular elements geometric center respectively.
Embodiment 1
For the steel pipe that processing specification is φ 610 × 11.9 × 12000mm, adopt the high frequency tack welding process of the straight-line joint submerged arc welding tube in the present invention to carry out processing to it and include following steps:
1) the band steel raw material adopting coil of strip to process as steel pipe, sends into feed roller by coil of strip after leveling;
2) carry out the process of milling limit to the coil of strip in step 1), it is for forming double V-groove by connecting portion; Wherein, the specification of coil of strip is 11.9 × 1878 × C millimeter (C can adjust according to the demand of steel pipe length), and the width of steel coil behind milling limit is 1872 ± 1 millimeters, milling corner degree and size as shown in Figure 1,
3) processing and forming process is carried out by band steel feedstock transportation to shaping machine set:
4) to step 2) in complete processing and forming process steel pipe carry out the process of high frequency prewelding, and the steel pipe completing the process of high frequency prewelding is partitioned into multiple scale body; Wherein, to the concrete grammar that steel pipe carries out high frequency prewelding be:
By high frequency induction heater, steel pipe is heated, by under the heating environment of 1400 DEG C, make the edges of boards position of steel pipe reach plastic period; Carry out pressurized treatments by welding compression roller to the steel pipe edges of boards being in plastic deformation deformation stage, amount of compression is 3 millimeters; Prewelding process is carried out to the steel pipe edges of boards be in above-mentioned middle heating and pressurized treatments, and water quench process is carried out to the steel pipe completing prewelding process;
5) to step 2) in scale body carry out the submerged arc welding process of inner and outer respectively, the relevant parameter of submerged arc welding process sees the following form:
Above-mentioned steps 4) in, carry out the shaping picture of material object of the pre-postwelding of high frequency as shown in Figure 2 to steel pipe, can be obtained by Fig. 2, adopt the steel pipe seam after the high frequency prewelding process in step 4) smooth, zero defect produces.
Adopt the high frequency tack welding process of the straight-line joint submerged arc welding tube of technique scheme, it adopts the mode of high frequency prewelding to carry out the prewelding of steel pipe, its prewelding speed improves 3.6 times, simultaneously owing to staying out of filling metal in high frequency prewelding process, rely on the edge heating to coil of strip raw material and the object reaching welding of pressurizeing, thus avoid the generation of arc light, also do not use gas in high-frequency welding process, so improve welding surroundings while saving material cost.The qualification rate of its RT, UT, film making improves close to 6%, improves product quality, decreases the workload of faults repair, and its physicochemical property is good.
Adopt the high frequency tack welding process of the straight-line joint submerged arc welding tube of technique scheme; the steel pipe being 610 × 11.9 millimeters for specification respectively with the gas metal-arc welding in conventional processes is processed, its welding performance with weld after detect Data Comparison and see the following form:
As seen from the above table, the high frequency tack welding process of the straight-line joint submerged arc welding tube in the present invention, its not only in welding efficiency comparatively conventional soldering method there is remarkable lifting, and welding precision with qualitatively, also there is clear superiority.
Embodiment 2
As a modification of the present invention, in described step 1), coil of strip adopts the mode of monovolume material loading by coil of strip feedstock transportation to shaping machine set.Adopt such scheme; it passes through coil of strip as raw material; the cost of steel pipe is effectively controlled; simultaneously; its mode by monovolume material loading realizes the continuous prewelding of multiple coil of strip, avoids occurring in welding process shutting down thus affecting efficiency, and can in the prewelding process of steel pipe; avoid occurring gap and cause the defect such as pore, slag inclusion, and then effectively improve lumber recovery.
All the other feature & benefits of the present embodiment are all identical with embodiment 1.
Embodiment 3
As a modification of the present invention, described 3) in, to the concrete grammar of the processing and forming process of coil of strip be: respectively by empty roll forming, row-roll forming process, fin is shaping makes coil of strip machine-shaping; Wherein, coil of strip is processed into C-type steel by empty roll forming and row-roll forming process to be rolled up, and fin is shaping is processed into O shaped steel volume by C-type steel volume.Adopt such scheme, it can significantly improve the surface quality of steel pipe, and follow-up machining accuracy.
The relevant parameter of above-mentioned processing and forming sees the following form:
All the other feature & benefits of the present embodiment are all identical with embodiment 2.
Embodiment 4
As a modification of the present invention, described step 2) in, after completing the segmentation of multiple scale body, interior mill processing of rust removing need be carried out to each scale body.Owing to there is the intervention of cooling water in high-frequency welding process, so steel pipe weld joint on inner side has more floating rust; Adopt such scheme, it is by interior mill processing of rust removing, effectively eliminates the floating rust of steel duct, thus guarantees that it can not affect follow-up submerged-arc welding process.
All the other feature & benefits of the present embodiment are all identical with embodiment 3
Embodiment 5
As a modification of the present invention, in described step 3), before scale body being carried out respectively to the submerged arc welding process of inner and outer, arc-extinguishing plate need be drawn in the welding of the commissure of steel pipe.
All the other feature & benefits of the present embodiment are all identical with embodiment 4.
Claims (6)
1. a high frequency tack welding process for straight-line joint submerged arc welding tube, is characterized in that, the high frequency tack welding process of described straight-line joint submerged arc welding tube includes following steps:
1) processing and forming process is carried out by band steel feedstock transportation to shaping machine set;
2) carry out prewelding process to the steel pipe completing processing and forming process in step 1), its welding manner adopted is high-frequency welding, and the steel pipe completing the process of high frequency prewelding is partitioned into multiple scale body;
3) to step 2) in scale body carry out the submerged arc welding process of inner and outer respectively.
2. according to the high frequency tack welding process of straight-line joint submerged arc welding tube according to claim 1, it is characterized in that, in described step 1), band steel raw material adopts coil of strip, and it adopts the mode of monovolume material loading by coil of strip feedstock transportation to shaping machine set.
3. according to the high frequency tack welding process of the straight-line joint submerged arc welding tube described in claim 1 or 2, it is characterized in that, in described step 1), before processing and forming process is carried out to band steel raw material, the process of milling limit need be carried out to band steel.
4. according to the high frequency tack welding process of straight-line joint submerged arc welding tube according to claim 3, it is characterized in that, described step 2) in, concrete grammar steel pipe being carried out to the process of high-frequency welding prewelding is:
2.1) by high frequency induction heater, steel pipe is heated, make the edges of boards position of steel pipe reach plastic period;
2.2) pressurized treatments is carried out to the steel pipe edges of boards being in plastic deformation deformation stage;
2.3) to being in step 2.1) with step 2.2) in heat and pressurized treatments in steel pipe edges of boards carry out prewelding process;
2.4) to step 2.3) in complete prewelding process steel pipe carry out cooling processing.
5. according to the high frequency tack welding process of straight-line joint submerged arc welding tube according to claim 4, it is characterized in that, described step 2) in, after completing the segmentation of multiple scale body, interior mill processing of rust removing need be carried out to each scale body.
6. according to the high frequency tack welding process of straight-line joint submerged arc welding tube according to claim 5, it is characterized in that, in described step 3), before scale body being carried out respectively to the submerged arc welding process of inner and outer, arc-extinguishing plate need be drawn in the welding of the commissure of steel pipe.
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| CN201410642797.5A CN104439672A (en) | 2014-11-14 | 2014-11-14 | High frequency prewelding technology of longitudinal submerged arc welded pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880952A (en) * | 2016-06-03 | 2016-08-24 | 合肥紫金钢管股份有限公司 | Production process of longitudinal submerged arc welded pipe for oil and gas transmission |
| CN106239168A (en) * | 2016-08-01 | 2016-12-21 | 葫芦岛市钢管工业有限公司 | A kind of pre-soldering method of the ERW for LSAW steel pipe's production |
| CN106514030A (en) * | 2016-10-17 | 2017-03-22 | 番禺珠江钢管（连云港）有限公司 | Application method for X groove in thick-wall pipe high frequency induction welding |
| CN106624614A (en) * | 2016-10-11 | 2017-05-10 | 武汉钢铁股份有限公司 | Manufacturing process for large-diameter thick-wall high-strength welded tube |
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| CN101214511A (en) * | 2007-12-29 | 2008-07-09 | 番禺珠江钢管有限公司 | Large straight-line joint submerged arc welding tube fast production process |
| CN102172814A (en) * | 2011-01-10 | 2011-09-07 | 崔建立 | Method for manufacturing longitudinal submerged arc welded pipe |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008520443A (en) * | 2004-11-23 | 2008-06-19 | ユー．アイ．ティー． リミテッド ライアビリティ カンパニー | Providing welded joints with novel properties and ultrasonic shock treatment |
| CN101214511A (en) * | 2007-12-29 | 2008-07-09 | 番禺珠江钢管有限公司 | Large straight-line joint submerged arc welding tube fast production process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880952A (en) * | 2016-06-03 | 2016-08-24 | 合肥紫金钢管股份有限公司 | Production process of longitudinal submerged arc welded pipe for oil and gas transmission |
| CN106239168A (en) * | 2016-08-01 | 2016-12-21 | 葫芦岛市钢管工业有限公司 | A kind of pre-soldering method of the ERW for LSAW steel pipe's production |
| CN106624614A (en) * | 2016-10-11 | 2017-05-10 | 武汉钢铁股份有限公司 | Manufacturing process for large-diameter thick-wall high-strength welded tube |
| CN106624614B (en) * | 2016-10-11 | 2019-08-23 | 武汉钢铁有限公司 | A kind of manufacturing process of the high-strength welded tube of heavy caliber thick wall |
| CN106514030A (en) * | 2016-10-17 | 2017-03-22 | 番禺珠江钢管（连云港）有限公司 | Application method for X groove in thick-wall pipe high frequency induction welding |
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Application publication date: 20150325 |