CN106514030A - Application method for X groove in thick-wall pipe high frequency induction welding - Google Patents
Application method for X groove in thick-wall pipe high frequency induction welding Download PDFInfo
- Publication number
- CN106514030A CN106514030A CN201610900011.4A CN201610900011A CN106514030A CN 106514030 A CN106514030 A CN 106514030A CN 201610900011 A CN201610900011 A CN 201610900011A CN 106514030 A CN106514030 A CN 106514030A
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- China
- Prior art keywords
- welding
- thick
- high frequency
- frequency induction
- groove
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Classifications
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- 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
Abstract
The invention discloses an application method for an X groove in thick-wall pipe high frequency induction welding. The application method is characterized by comprising the following steps of (1) loading and flattening, (2) edge milling of the X type groove, (3) forming by entering a forming unit, and (4) high frequency welding; according to edge milling of the X type groove in the step (2), the X type groove is machined by an edge milling machine, overall length machining is conducted through the edge milling machine, the upper and lower groove angle a is equal to 30 degrees to 40 degrees, and the upper and lower groove height h1/h2 is equal to 0.15 t to 0.35 t mm. The problems that in the prior art, during production of a thick-wall high frequency induction welding pipe, the heating temperature is nonuniform, and the edges of the inner wall and the outer wall is overheated and is melted in advance are solved.
Description
Technical field
The present invention relates to a kind of X grooves application process in thick-walled pipe high frequency induction welding, belongs to high-frequency welding technical field.
Background technology
High-frequency welding（HFW) technology is heated rapidly mother metal edge using the kelvin effect and kindred effect of high frequency electric
Carry out extruding to after welding temperature, weld technology so as to realize material connection.High-frequency straight seam induction pipe welding system speed of production
Height, welding process are stable, and quality is good, is widely used to Welded tube production.In recent years, with the development of HFW welded tube technologies, in oil
The fields such as letter shoot road, building structure pipe, low-pressure fluid delivery pipe are applied, and gradually develop to heavy caliber, thick-walled pipe direction.
General producer is directly entered high-frequency welding after slitting, and its groove is all " I "-shape.When steel band enters welded tube mill
Group after the shaping of format roll, guide roller orientation is formed with the round steel pipe pipe of opened gap, adjusts the extruding of compression roller
Amount adjustment weld gap so that the interface two ends of welding are as far as possible concordant, reduce misalignment, in actual production due to pipe thickness not
Together, docking when HFW welded tube welding seams are molded typically has three kinds：That is V-type docking, the docking of I types and reverse V-shaped docking；When V-type is docked,
Due to first contacting seam on the inside of steel pipe, inner side welding current is higher than outside weldings electric current so that inner side temperature is welded higher than outer wall
Temperature, V-type docking are needed with many heat inputs, while inner burr is big.I types docking steel pipe inside and outside wall is contacted simultaneously, and temperature compares
With.Reverse V-shaped docking and V-type dock contrast, and outer wall of steel pipe first contacts seam, and outer wall welding current is higher than interior welds electricity
Stream so that outside wall temperature is higher than inner side temperature.Due to into steel band before closed type outer side stretching, inboard compression, into closing
After pass, tube reducing acts on and is formed the combined cause of interior outer perimeter difference after pipe, and easily the contact of formation V-type, causes interior dispatch from foreign news agency
Stream, temperature contrast are larger, easily produce weld defect.In present induction welding production process, typically all control as far as possible
Docking pattern is I types.
During ratio-frequency welded tube, high frequency induction current is acted on steel pipe except skin effect, kindred effect also have wedge angle
Effect, when induced-current passes through whole heating surface, the current density at wedge angle position is higher than other positions, so herein
Temperature wants high many.When production heating thick-walled pipe, the inside and outside wall wedge angle position heating-up temperature of pipe will be far above centre
Temperature, is heated to melting state in advance, and middle part temperature not yet reaches welding temperature.When welding material thickness is more than 13mm
During the tubing of the above, if adopting this " I " shape groove, because the relation of bending circular arc, and the wedge angle of high frequency induction current
Effect, causes inside and outside wall temperature high, is accomplished by melting and falls the inside and outside boundary layer that pipe is first contacted during welding, formed it is very high it is interior,
Outer burr, and sheet material central core underheat is easily caused, Weld pipe mill cold welding is caused, the welding for having influence on high frequency weld seam is strong
Degree, inside and outside wedge angle are melted in advance, form molten iron molten drop, and inwall molten drop is dropped down onto on impedor, damage bar magnet, and outer wall molten drop is being deposited
It is weld edge, welded compression roller extruding produces pit on weld edge mother metal, affects welding quality.So giving birth to
When producing thick-walled pipe high-frequency welding, pipe preferably through plane while or processes during milling, remove inside and outside wedge angle, make groove in X-shaped.
When thick-walled pipe high-frequency welding is produced, the equal of edges of boards how is controlled with heating（Skin effect）, it is to avoid half of wedge angle
It is overheated in advance（Sharp angle effect）, become the key technology of thick-walled pipe ratio-frequency welded tube.My company state's architectural engineering order aborning
φ 610*22mm/S355J0H thick walled steel tubes, speed of production are 6 ~ 8 meters/min, and input power 1050KW, high frequency induction welding are welded
During, can substantially find that inside and outside wall edge has reached welding temperature, this phase when apart from 100 ~ 150mm of pad, just
It is still kermesinus to edges of boards center temperature color, when apart from pad 30mm or so, molten drop occurs in inside and outside wall edge,
Into upper compression roller, after compression roller welding, striking off inside and outside burr, outer surface occurs continuous in the range of weld edge 10mm
Pit, has substantial amounts of molten iron slag to pile up, magnetic rod sleeve and bar magnet is burnt, affect weldering on the bar magnet of impedor below compression roller
Connect quality.After production terminates per coiled strip, molten slag removal is required for, while changing the bar magnet for damaging.Therefore, in equipment speed of production
When being close to the capacity of equipment upper limit with power, a kind of effective ways are needed to solve heating-up temperature during thick-walled pipe HFI welding
It is uneven, the overheated problem melted in advance in inside and outside wall edge.
The content of the invention
The present invention is exactly for technical problem present in prior art, there is provided a kind of X grooves are in thick-walled pipe high-frequency induction
Application process in weldering, solves prior art in production heavy wall high-frequency induction welded tube process, and heating-up temperature is uneven, inside and outside wall side
The overheated problem melted in advance of edge.
To achieve these goals, technical scheme is as follows, and a kind of X grooves should in thick-walled pipe high frequency induction welding
With method, X grooves application process in thick-walled pipe high frequency induction welding, it is characterised in that methods described is as follows：1）Feeding leveling,
2）X-type groove milling side, 3）Shaping, 4）High-frequency welding.
As a modification of the present invention, the step 2）Middle X-type groove milling side, processes X-type groove by edge milling machines, adopts
Processed with edge milling machines total length, upper and lower bevel angle a=30 ° ~ 40 °, uphill, downhill open height h1/h2=0.15t ~ 0.35tmm (t:For
Steel plate wall thickness）.
Relative to prior art, the invention has the advantages that, the technical scheme in milling crack approach, using X groove cutters,
Edges of boards are milled out into X-type groove so that after steel pipe forming, avoid " sharp angle effect " from affecting welding matter in high frequency induction welding termination process
Amount, the coil of strip behind X groove millings side enter welding compression roller by forming machine shaping, after being oriented to roller guide, are closed by adjusting
After suitable amount of compression, eliminate and the mother metal lack part of inside and outside wall is produced because of milling X grooves, while aligning heating power, welding speed
Degree, in welding process, sharp angle effect greatly reduces, and solder side temperature is uniform, and it is little to produce inside and outside burr, low without a large amount of slags
The qualified thick-walled pipe high-frequency induction welded tube of impedor and the outward appearance of falling；The technical scheme solves the welding that central temperature deficiency is caused
The unstable problem of quality, improves welding production speed, reduces and drips scaling loss impedor because of welding slag, affects welding, improves
Production efficiency.
Description of the drawings
Fig. 1 is retaining wall on slope schematic diagram.
Specific embodiment：
In order to deepen the understanding of the present invention, below in conjunction with the accompanying drawings the present embodiment is described in detail.
Embodiment 1：Referring to Fig. 1, a kind of X grooves application process in thick-walled pipe high frequency induction welding, X grooves are high in thick-walled pipe
Application process in frequency induction welding, methods described are as follows：1）Feeding leveling, 2）X-type groove milling side, 3）Shaping, 4）High-frequency welding.
The step 2）Middle X-type groove milling side, processes X-type groove by edge milling machines, is processed using edge milling machines total length, upper,
Lower bevel angle a=30 ° ~ 40 °, uphill, downhill open height h1/h2=0.15t ~ 0.35tmm.
Concrete application example：
1st, I groove high frequency induction weldings are adopted in production φ 610*22, material 355J0H.
2nd, φ 457*17.5/355.6*14.2, material L415M adopt X groove high frequency induction weldings.Technological process is routinely given birth to
Product mode feeding uncoiling, milling side slope mouth are set to 40 ° of upper and lower groove, upper groove depth 2.5/2.3mm, root face height 13/8mm,
In production process, coil of strip total length leveling prevents edges of boards wave, causes groove cause not of uniform size in milling crack approach, affects welding
Quality.Concrete processing parameter is shown in the welding parameter table of comparisons.
The welding parameter table of comparisons
The advantage of X groove high-frequency induction welded tube production technologies：
1st, after X grooves are improved, " sharp angle effect " is reduced, and solder side temperature homogeneous heating, speed of welding can be improved to 10 ~ 12m/
Min, improves raw speed；
2nd, Jing Non-Destructive Testings, Physicochemical test, welding quality stable are learned performance and meet technical standard requirement
3rd, there are not a large amount of slag drip impedors in whole production process, cause impedor to damage and change.
It should be noted that above-described embodiment, not for limiting protection scope of the present invention, in above-mentioned technical proposal
On the basis of done equivalents or replacement each fall within the scope protected by the claims in the present invention.
Claims (3)
1. a kind of X grooves application process in thick-walled pipe high frequency induction welding, it is characterised in that methods described is as follows：1）Feeding is rectified
It is flat, 2）X-type groove milling side, 3）Shaping, is molded into shaping machine set, 4）High-frequency welding.
2. X grooves according to claim 1 application process in thick-walled pipe high frequency induction welding, it is characterised in that the step
Rapid 2）Middle X-type groove milling side, processes X-type groove by edge milling machines, is processed using edge milling machines total length, upper and lower bevel angle a=30 °
~ 40 °, uphill, downhill open height h1/h2=0.15t ~ 0.35tmm.
3. X grooves according to claim 1 application process in thick-walled pipe high frequency induction welding, it is characterised in that the step
Rapid 4）Double V-shaped groove welding is adopted during high-frequency welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610900011.4A CN106514030A (en) | 2016-10-17 | 2016-10-17 | Application method for X groove in thick-wall pipe high frequency induction welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610900011.4A CN106514030A (en) | 2016-10-17 | 2016-10-17 | Application method for X groove in thick-wall pipe high frequency induction welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106514030A true CN106514030A (en) | 2017-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610900011.4A Pending CN106514030A (en) | 2016-10-17 | 2016-10-17 | Application method for X groove in thick-wall pipe high frequency induction welding |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54126656A (en) * | 1978-03-24 | 1979-10-02 | Sumitomo Metal Ind Ltd | Electric welded steel pipe superior in groove corrosion resistance |
| SU718239A1 (en) * | 1978-08-15 | 1980-02-29 | Уральский научно-исследовательский институт трубной промышленности | Roller for high-frequency welding of pipes |
| 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 |
| CN103286527A (en) * | 2013-03-29 | 2013-09-11 | 常州钢劲型钢有限公司 | Production process for extra-large aperture super wall thickness square steel pipe |
| CN104384678A (en) * | 2014-11-14 | 2015-03-04 | 番禺珠江钢管（连云港）有限公司 | Novel welding technology of SSAW (Spirally Submerged Arc Welding) pipe |
| CN104439672A (en) * | 2014-11-14 | 2015-03-25 | 番禺珠江钢管（连云港）有限公司 | High frequency prewelding technology of longitudinal submerged arc welded pipe |
-
2016
- 2016-10-17 CN CN201610900011.4A patent/CN106514030A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54126656A (en) * | 1978-03-24 | 1979-10-02 | Sumitomo Metal Ind Ltd | Electric welded steel pipe superior in groove corrosion resistance |
| SU718239A1 (en) * | 1978-08-15 | 1980-02-29 | Уральский научно-исследовательский институт трубной промышленности | Roller for high-frequency welding of pipes |
| 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 |
| CN103286527A (en) * | 2013-03-29 | 2013-09-11 | 常州钢劲型钢有限公司 | Production process for extra-large aperture super wall thickness square steel pipe |
| CN104384678A (en) * | 2014-11-14 | 2015-03-04 | 番禺珠江钢管（连云港）有限公司 | Novel welding technology of SSAW (Spirally Submerged Arc Welding) pipe |
| CN104439672A (en) * | 2014-11-14 | 2015-03-25 | 番禺珠江钢管（连云港）有限公司 | High frequency prewelding technology of longitudinal submerged arc welded pipe |
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Application publication date: 20170322 |