CA1309470C - Welding complex - Google Patents
Welding complexInfo
- Publication number
- CA1309470C CA1309470C CA000578861A CA578861A CA1309470C CA 1309470 C CA1309470 C CA 1309470C CA 000578861 A CA000578861 A CA 000578861A CA 578861 A CA578861 A CA 578861A CA 1309470 C CA1309470 C CA 1309470C
- Authority
- CA
- Canada
- Prior art keywords
- pipeline
- pipe section
- pipe
- welded
- welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
WELDING COMPLEX
ABSTRACT
A welding complex in accordance with the invention comprises a machine for resistance butt welding, means for supporting the end part of the pipeline and holding means including a platform reciprocable axially of the pipeline and a plate with a device for carrying the pipe section to be welded, rotatable by a drive between the positions of loading a pipe section and aligning it with the pipeline. for loading the holding means with the plate rotated into the loading position, by longi-tudinally displacing a pipe section from the accumulator, the latter is arranged alongside the platform, so that the pipe section it delivers extends at an acute angle relative to the end of the pipeline.
ABSTRACT
A welding complex in accordance with the invention comprises a machine for resistance butt welding, means for supporting the end part of the pipeline and holding means including a platform reciprocable axially of the pipeline and a plate with a device for carrying the pipe section to be welded, rotatable by a drive between the positions of loading a pipe section and aligning it with the pipeline. for loading the holding means with the plate rotated into the loading position, by longi-tudinally displacing a pipe section from the accumulator, the latter is arranged alongside the platform, so that the pipe section it delivers extends at an acute angle relative to the end of the pipeline.
Description
1 30947~
Field o~ the Invention ~ he invention relates to weldi~g teohnolo6ies, and more partioularly it relates to arrangem~nts for resistance butt welding of annular joints of pipes in construction of continuous underwater pipeline~.
Description of the Prior Art The construction of continuous underwater pipe-lines involves the p~oblem of performi~g the procedure of welding of annular joints of successive pipes in the limited space o$ a water-borne vessel eventually subjected to roll and pitch, where the pipe-welding equipment is mounted.
There is known an installation of laser-beam wel-ding of pipelines accommodated on a stationary supportdevice fast with the deck of the pipeline-laying ship, the device supporting the means for holding, aligning and retaining in the working position the pipeline and the pipe to b~ welded thereto (DE, B, 2515925).
Field o~ the Invention ~ he invention relates to weldi~g teohnolo6ies, and more partioularly it relates to arrangem~nts for resistance butt welding of annular joints of pipes in construction of continuous underwater pipeline~.
Description of the Prior Art The construction of continuous underwater pipe-lines involves the p~oblem of performi~g the procedure of welding of annular joints of successive pipes in the limited space o$ a water-borne vessel eventually subjected to roll and pitch, where the pipe-welding equipment is mounted.
There is known an installation of laser-beam wel-ding of pipelines accommodated on a stationary supportdevice fast with the deck of the pipeline-laying ship, the device supporting the means for holding, aligning and retaining in the working position the pipeline and the pipe to b~ welded thereto (DE, B, 2515925).
2~ The installation offers high productivity of the pipe construction process; however, the laser-beam welding technology it employs is significan~ly costly, to say nothing of its requ~g a considerable amount o~ the auxiliary equipment and numerous operating per-sonnel.
~ore cost-conscious is a known welding complex y ~
1 3~q470 employing electric-arc welding for construction of an underwater pipeline (Weldin~ Journal, September, 1978, pp. 15-21, R.~.Jones et ~l., "U9inæ the ~a8 metal arc process speeds pipelaying and reduoes construotlon time of ~orth Sea Pipeline"). ~he co~plex is intended for installation on the deck of a barge-type vessel and includes a device ~or supporting the end part of the ` pipeline, a machine ~or gas-shielded electric-arc wel-ding, arranged in the workin~ position in the area o~
10 the joint of the pipeline with the pipe to be welded thereto, burr-removing trimmers arranged in the working position coaxially with the pipeline along the path o~ its motion relative to the barge as the latter moves into its successive working position, and a stationary 15 holding device for setting, holding and retaining the pipe to be welded, the abovementioned weldi~g machine and the trimmers in their working position, aligned with the device for supporting the end part of the pipe-line. Laterally offset from the comnlon axis o~ the 20 pipeline and the pipe to be welded thereto is a store or accumulator operated for storing pipes to be welded and successively delivering them at the loading position.
The pipes are stacked in the accumula~or to extend pa-rallel with the pipeline, their loadin~ being e~fected 25 by a pipe-handling device moving a successive pipe into the position of abutting against the pipelins in a _~_ flat-parallel motion horizontally and vertically. The stability of the relative positions o~ the end of the pipeline and the pipe being welded thereto i9 main-tained throughout the weldin~ operation by the speoific deæign features of the barge and the procedure of its retaini~g relative to the bottom of the water re-servoir in question.
However, the productivity of the welding process performed by the last-described weldi~g complex is not 10 adequately high, as the electric-arc welding technology is characterized by a high input of manual labor and a considerable amount of the required auxiliary equip-ment whose accommodation in the limited workinæ space presents serious problems.
Resistance butt weldi~g as a technology signi-ficantly ~ore productive, providing for fine quality of welds and requiiing less bulky equipment has not been employed as yet in the environment of laying under-water pipelines.
However, the use of resistance butt welding mach-ine in the last-described complex of the prior art would have been ~ndered by the complexity of the task of ensuring strict axial alignment of the pipes bein~
joined under roll and pitch conditions, and also 25 by the fact that the insertion of a relatively elongaæed inter-pipe welding machine or of an internal b~rr-removing trimmer into the pipe to be welded requires additional worklnæ area which is at least equal to the respective lengths of the inter-pipe welding machine or of the internal triulmer lenKthwise of the oarrler Summarg of tbe Inv~tio~
It is the main object of the present invention to create an economioal and ef~icient welding complex for constructing continuous underwater pipelines, providing for fine quality of the welds.
It is a specific object of the present invention 10 to provide prerequisites for implementing the highly ef~icient technology of resistance butt welding of pipe sections in a limited ~pace of the carrier vessol sus-ceptible to roll and pitch.
~he term `'a pipe section" used here and herein-15 below is meant to describe a length of the pipe to bewelded to the pipeline at a single go. It may be a single pipe length or several pipe lengths pre-welded to~ether in advance for further handling.
~hese and other objects are attained in a welding 20 complex for construction of a continuous underwater pipeline, adapted to be installed aboard a ship, comp-riSing a welding machine positionable at a joint of the pipeline with a pipe section to be welded~ thereto~
burr-removingtrimmers positionable coaxially with the 25 pipeline for displacement relative thereto in the joint area, a support device for the end part of the pipeline, a rotatably mounted holding device for setting, Il 30q~70 holdlng and retaining the pipe section to be welded, the welding machine and the trimmers, axially aligned with the end part of the pipeline, an accumulator for storing and deliverlng su¢aessive pipe sections at a loadinæ position, laterally o~f~et ~rom the aommon axis of the pipeline and of the pipe section to be welded thereto~
In the welding complex in acoordance with the invention the holding device includes a platYorm movable along the common axis of the pipeline and o~ the pipe section to be welded thereto by the machine for resistan-`aé butt welding and a plate with a means for carrying the pipe section to be welded, mounted on a pivot car-ried by the platform for rotation between the loading 15 po9ition and the position of aligni~g the pipe section to be welded, and operatively connected with a drive for its rotation, the accumulator being mounted so that a pipe section bein~ delivered extends at anaDsle re-lative to the end part of the pipeline, for its longi-20 tudinal displacement from the accumula~or into the holding device upon the latter's plate havin~ been rota-ted into the loading position.
The disclosed structure of the welding comple~
provides for implementing resistance butt welding in 25 construction of continuous underwater pipelines, as the mobility of the platform carrying the whole welding equipment involved in the weldiLg operation enables 1 30947~
it to ~ollow the moving end o~ the pipelinR in combi-nation with the loading of successive pipe sections from the joint side, faasiblo owin~ to the dis¢losed arrangement o~ the accumulator and the desi~n of the rotatable plate, ensuring the accuraoy o~ the alignment and permanence of the gap between the edges being welded, and that with a reduced overall length of the equipment of the welding complex. ~urthermore, the diss-losed structure allows to handle longer pipe sections, ~hiah additionally enhances the efficienoy o~ the pipe-line construction procedure by reducing the number o~
the joints to be welded "on the site".
Depending on the len~th and diameter of pipe sec-tions to be welded, the resistance butt welding machine incorporated in the welding complex of the invention can be either an inter-pipe machine, i.e. a machine insertable into the pipes bein~ welded, or a machine for mounting externally on the pipes. In the ~irst-mentioned case it is preferably mounted on the rota-table plate, and in the second case, on the plat~ormof the holding device.
~ o simplify the structure o~ the holdin~ de~ice, it is expedient that the pivot for rotation of the plate of the holdi~g device should include the piston rod of a hydraulic cylinder mounted on the platform in axial alignment wi-th the common a~is of the pipe-line and o~ the pipe section to be welded thereto, at the side of th~ end o~ ~he pipe section opposit8 to itsend to be welded, there being preferably mounted at the side of the end to be welded on the platform at least one more hydraulic cylinder adapted to ooope-rate wi~h the plate in the position o~ ali~nin~ thepipe section to be welded, for assisting the first-men-tioned hydraulic cylinder in aligning the axis of the pipe section to be welded ~ith the axis of the pipeline in one and the same horizontal plane.
Brief Description of the Drawings The present invention will be further described in connection with its embodiments, with reference being made to the accompanying drawings, wherein:
FIG. 1 shows schematically a pipelaying barge having mounted thereon a welding complex embodying the inve~tion;
FIG. 2 shows schematically in more detail the ge-neral view of the weldin~ complex;
FIGS 3 and 4 show a view in plan of the welding complex, respectively, in the working and loading posi-tions;
FIG. 5 is a sec-tional view -taken on line V-V of FIG. 2;
FIG. 6 is a sectional view taken on li~e VI-VI
of FIG. 2;
FIG. 7 shows s~hematically the general ~iew of a modified e~bodiment of the welding complex in accor-dance with the invention.
_~_ Desoription o~ the Preferred ~mbodiments Referring now in particular to the appe~ded dra-wings, a welding complex 1 (FIG. 1) for constructing a continuous und~rwater pipeline 2 i~ mounted on the deck 3 of a barge 4. ~he complex 1 comprises a device 5 for supporting the end part of the pipeline 2, in the form of a roller table installed on the deck 3, and a holdin~ device 6 carrying an inter-pipe welding machine 7 (~IG. 2) for resiætance butt welding, clamping 1~ mechanisms 8 and 9, and an external burr-removin~
trimmer 10~ Laterally offset from the device 6 is an accumulator 11 (~IGS 3, 4) for storage and successive delivery of pipe sections 12 to be welded, each sec-tion being either a single pipe length or several pipe lengths pre-welded together for further handling.
The weldi~g complex 1 (~IG. 1) is supplied with power from a power station 13 (FIGS 3 and 4) mounted jointly with a control unit (not shown) on the deck 3 (~IG. 1) of the barge 4 and electrically connected with the inter-pipe welding machine ? via a rotatable boom 14 (FIG. 2) supporting a supply of power cable 15.
In accordance with the invention, the holding de-vice 6 includes a platform 16 mounted for reciprocation on the deck 3 along rails 17 extending axially of the pipeline 2. The platform 16 is associated ~ith an actu-ator 18 in the form of a power cylinder pivotally moun-_~_ 1 3(~9~7~
ted on th~ d~ck 3 ~nd having it~ pisto~ rod pivotallyconnected to the underside of the plat~orm 16 in the area of its wheels 19. Mounted for rota~ion on the plat~orm 16 about a vertiaal pivot 20 is a pl~te 21 with a ~ulde roller 22 mou~ted on its distal end for rolli~g along an arcuate rail 23 (FIG. 4) provided on the platform 16, as the plate 21 is rotated about the pivot 20. The plate 21 is associated with a drive 24 for its rotation in the form of a double-acting 10 hydraulic cylinder havin~ its housing pivotally mounted on the platform 16 and its piston rod pivo-tally joined to the plate 21.
Mounted on the plate 21 (FIG. 5) in the area of its pivot 20 is the motion mechanism 25 operatively 15 connected with a rod 26 carrying the inter-pipe welding machine 7 which can be any suitable known inter-pipe machine for resistance butt welding of pipes (D~,B, 2918082).
~he motion mechanism 25 o~ the present embodiment 2~ is a rack-and-pinion mechanism; however, it can be any other suitable mechanism for driving a member through a reciprocating motion, e.~. a hydraulic cy-linder. ~verlying the opposite, distal end of the plate 21 is a clamping mechanism 8 ~IG. 2) supported by 25 the platform 16 for retaining the pipe section 12 re-ceived about the welding machine 7 in its position of alignment with the pipeline 2, relative to ~he plat-form 16. The clampi~g meohanism 8 can be any 5Ui-table know~ appaxatus, 8. ~ an apparatus of the 9US-pension trolley type incorporated ln the k~own welding complex (SU, A, 904244), having its housi~g fast with the platform 16.
Mounted intermediate the motion mecha~ism 25 a~d the clamping mechanism 8 on the plate 21 is a device 27 ~or carryin~ the pipe section 12 to be welded, which 1~ in the presently described embodiment is in the form o~ a driven roller table facilitating axial adjustment of the pipe section 12.
In the preferred embodiment of the present in~e~-tion, the vertical pivot 20 of the plate is the piston rod of a hydraulic cylinder 28 (FIG. 5) fastened o~
the platform 16.
Underlyi~g the distal end of the plate 21 are hydraulio cylinders 29 (FIG. 6) and 30 mounted on the platform 16 and supporting the arcuate rail 23 on their 2~ piston rods. In their combination, the cylinders 28 to 30 present an arrangement for adjusting and cor-recting the position of the axis of the pipe section 12 to be welded relative to the axis of the end of the pipeline 2, i.e. for positive alignment of these two axes in one and the same horizontal plane. Positive alignment of these two axos in one and the same ver-tical plane is proYided for by the h~draulio o~linder 24 oapable of rotati~g the plate 21 (FIGS 3 and 4) and a mechanism ~1 (FIG 5) for its horizontal di3plaooment, including two h~draulic o~linder~ 32 ~d 33 mou~tod on the plate 21 and havi~g thoir pi~ton rods abuttiD3 against th~ housing of the mochanism 25 to the opposite sid~s of th~ rod 26.
The clamping meohanism 9 tFIGS 2 and 3) mou~ted on the platform 16 beyond tho outlin~ -o~ the plat~ 21 . .
10 is intanded for rctaining the platiorm 16 with ro~peot to tho end oi the pipeline 2 in the worki~g p~sition ~he me¢hanism 9 is preierabl~ o~ the same dosign as the clamping mechanism 8, its housing supporting ior axial raoiprocatio~ the ~xternal burr-romovin~ trimrur 10 15 oi a~ suitabl~ ~n~wn struoture` (US, A, 3657962).
The acoumulator 11 for atorage a~d suocessive de-li~er~ of pipe sections 12 to be welded, i an~sùitable ~nown structure ~DE,A~2364502), is iixedl~ secured on the deck 3 ~f the barge 4 alo~gside the platform 16 20 (FIGS 3 a~d 4) for the axis of the pipe seoti-n 12 being delivered, which is the l-ading p-sition of the welding complex 1, to extend at a~ anele ~C t- the axis of the pipeli~e 2 ~he vertex of the angle oC bel-~æs to the imaginar~ extensisn of ~he pipeline 2! be~-nd 25 its elld The actual ~lalue of the an~le o~ is selaoted from the ~erall l~;~out considerat~ s, to provide f-r 1 3`09~70 the m~nimum required ~paoe and mi~imized ~troke o~ the h~draulic c~linder 24 e~erahle ~or rotating the plate 21 throu~h thi~ angle; ho~ever, $n principle, this value oan be varied ln a fairl~ broad range.
~he acoumulat~r 11 is equipped with aorapi~ t-ol~
34 fer prèpari~ the e~ds ~ a pipe secti-n 12 i-r wel-ding.
FIG. 7 o~ the appended dra~lnæs illustratesschema-tlc~ a mo`d~gied embodiment cf the in~ention, with an e~ternall~ mountsd machine 35 ~or res$stance butt weldi~e incorporated in the welding complex 1 ins~ead of an in-ter-pipe machiue. ~he machine 35 can be of a~ suitable known structure (~Ej B~ 2332006).
~he eYternall~ mo~nted resistance butt ~eld~n~ maoh-15 .ine 35 is operativel~/ connected to the plat~orm 16 through the clampin~ mechani~m 8~ ~ith the motion mecha-nism 25 oi thig embodiment havin~ operati~elJ connected thereto a rod 36 ~ith an inter~lburr-remo~in~ trimmer 37 oi an~ suitable ~no~n structure (USj ~, 3745319~.
20 In other respects? this embodiment o~ the welding complex 1 is similar to the embodiment described herei~-above.
The ~eldinæ complex 1 of the pre~nt invention i9 operated, as follows.
~ pipe section 12 ~ith its ends treated in advanc~
b~ the scrapin~ tools 34 is deli~ered b~ th~ accumu-lator 11 (FIGS 3 and 4) to the Ioadi~position. Tbs - 1 3~9~7`0 dri~o 24 i~ onergizod to rotate the plate 21 ~ointl~
~ith the intor-pipe ~elding maohine 7 through the angle about the pivot 20 from the inltlal pooitio~ of allgnment of ths 6eometrio a~i~ o~ the lnter-pipe maohlne 7 ~lth the asi~ Or the pipeline 2. With the plate 21 thu~
robating, its rollor 22 19 guided b~ the arcuate rail 23.
Alternati~el~, ~hen the ~eldi~c compie~ 1 in¢orpo-rates the eYtornAll~ mounted ~oldl~g maohine 35, the lattor remain~ on the plat~orm 16 ~ith the plate 21 ro-10 tatin~, and the internal trimmer ~7 rotatos ~ointlywith the`plate 21.
In the loading position, the inter-pipe welding machine 7 (or, oo~respondinsl~; the internal trimmer ~7) i9 ¢oasial ~ith tho pipe section 12 ~hich i~ fsd b~
15 the dri~on roller tablo (not sho~n) underl~ing the-pipe section 12 on the accumulator 11 to movo onto the lnter-pips maahine 7 (or the internal trimmer 37).
The drive 24 is acti~ated in the re~erse direc-tlon, and the plate 21 jointl~ with the inter-pipe ~el-20 ding machine 7 (or thë-internal trimmer 37) and the pipe seotion 12 recelved thereabout i8 rotats~d into t~e in~tial position of alignment, abutting agaiD~t the hou-9ing of tho clamping mechanism 8.
~ho pipe section 12 i8 mo~ed aYiall~, ~ointl~
25 ~ith the inter-pipo ~eldiDæ machine 7 (or the internal trimmer 37) to~ards the pipeline 2 to abut again6t it8 end ~ace~ and l~ pre-clamped b~ the mochani~m 8, whereafter th~ro i9 ~ r~ormed positivo alignment of the aYls of the pipe se¢tion 12 with the axis oi the pipeline 2 in one a~d the ~qme horizontal plane by ~ointl~ operatins in ooordination the h~draullo c~-linders 28 to 30~ and ln one and the ~ame ~rtioalplane b~ ~o~ntl~ oparating in coordination the mecha-ni~m 31 ior horizontal displacoment oi the plat~ 21 and its rotation drivo 24. In the emhodiment with the inter-pip~ weldin6 machin~ 7, the motion meohani~m 25 i9 10 operated to project this ma¢hine 7 partly into the p~peli~e 2 b~ the regulred e~tent, to acqulre its wor~lng position with re~pect to the ~o~nt o~ the pipe-line 2 with the pipe aect~on 12, as sho~n in FI~S 2 and 31 wheroa~ter the corresponding mechanisms oi the 15 intor-pipe ~eldi~3 maohine 7 aro operatod ~or final centor~n~ and clamping Or the pipo seation 12 to be ~eldod ~ith respe¢t to the pipeline 2. Simultaneousl~, the olampin6 mechanism 8 i9 operated to release bhe pipe seetion 12.
In the embodiment with the e~ternally mountod wel-ding machine 35 (FIG. 7), the mechanism 25 is operated to pro3ect the internaI trimmer37 ~tothe pipeline 2 by the required o~tent, while the pipe section 12 i~ moved into the externally mounted pips-weldiDæ machine 35 25 ~or its ~inal centering and ¢lamping ~rom outside. ~he clampi~g mechanism 8 is operated to releaso the pipe seGbion 12, with the olamping mechani~m 9 beins in itswor~in6 ~tate o~ retainin6 the plat~orm 16 with respe¢t to the e~d o~ the pipeline 2.
Should a roll and/or pitoh 6ituatlon ma~e th~
barse ~ ~haft rclative to the pipeline 2, th~ latter in its oooperation with the platiorm 16 throu6h the clampi~æ-mechanl~m 9 and the clamp6 o~ elther the inter-pipe weldiDg machine 7 or the externally mounted welding machine 35 would ma~e the plat~orm 16 roll alo~6 the rails 17 jointly with the entire equipment of the welding complex 1 en6aged in the weldin~ prooe-dure. ~hus, the mobility of the platiorm 16 guarantee~
the reliability and accura¢y o~ the alisnme~t and per-manence o~ the pres~t relative aYlal positions o~ the weldsd ed6es o~ the pipe seotion 12 and pipeline 2.
Ii the plat~orm 16 is displaced in its wor~lng position from ~ts substantially ce~tral position length-wise of the rails 17, the actuator 18 is operated to reatore the plat~orm 10 to its central position provi-20 din6 the necessary latitude ~or welding on tolerablyrough seas. Otherwi~e, t~e actuator 18 func~ions as a hydraulic shoc~-absorber.
In the abovedeacribed wor~in~ position of the wel-din~ comple~ 1 either the inter-pipe machine 7 or the 25 èYternallg mounted welding machine 35 i8 operated to periorm the weldins o~ the joint in the speci~ied proce-dure.
With the weldin~ prooedure completed, the mecha-nism 25 i9 operated to retract oither the inter~pe weldlng machine ? or the inter~al trimmsr ~7 beyond the welded joint, remo~ing the in~ernal burrs (~lash).
External burrs (~lash) are removod by the external tri~mer 10, or else, in the embodiment with the ex-~ernally mounted welding machine 35, by a trimming device incorporated in the maohine 35.
~he clampiLg mechanism 9 is operated then for its 10 rollers to relea~e the pipeline 2 (and in th* embodi-ment with the e~ternally mounted weldinæ machine 35 the latte~ i9 also operated to release the pipeline 2), and the barge 4 is ad~anced through a rsquirèd distance relative to the pipeline 2 (with the last-mentioned pipe 15 section 12 welded thereto) whioh freely rolls along the roller table of the support de~ic~ 5, until the remote ; (iree) end of the last-welded pipe section 12 aoquires the position which is initial ior welding the ne~t aoint.
With the barge 4 arrested, the pipeline 2 is retained 20 once again relative to the platform 16 by the clamping meahanism 9, and the abovedescribed operating cycle i~
repeatèd.
It can be seen irom the abo~e description ~that the disclosed weldins oompleY is compact and reliable in operation. Its layou~ allows to reduce the length of the fipace occupied b~ the welding equipment and to cut down 1 3;~9~0 the amount o~ auxiliary equlpm~nt.
Considering that the incorporation of the rotatableplate has eliminated the neoesslty o~ retraotin6 the inter-pipe welding maohine (or the inter~l trlmmer) from the joint by the ~ull length of the successive pipe ~e¢tion to bs welded, the length of the lstter oan be stepped up, which provides for ha~g less 30ints to be welded "on the site". The abo~esa~d enhances the productivity o~ pipeline construction in addition to 10 the essentially higher ef~iciency attained o~i~g to the implementatio~ of resistanc~ butt weldiLg o~ pipes u~der offshore conditions. -
~ore cost-conscious is a known welding complex y ~
1 3~q470 employing electric-arc welding for construction of an underwater pipeline (Weldin~ Journal, September, 1978, pp. 15-21, R.~.Jones et ~l., "U9inæ the ~a8 metal arc process speeds pipelaying and reduoes construotlon time of ~orth Sea Pipeline"). ~he co~plex is intended for installation on the deck of a barge-type vessel and includes a device ~or supporting the end part of the ` pipeline, a machine ~or gas-shielded electric-arc wel-ding, arranged in the workin~ position in the area o~
10 the joint of the pipeline with the pipe to be welded thereto, burr-removing trimmers arranged in the working position coaxially with the pipeline along the path o~ its motion relative to the barge as the latter moves into its successive working position, and a stationary 15 holding device for setting, holding and retaining the pipe to be welded, the abovementioned weldi~g machine and the trimmers in their working position, aligned with the device for supporting the end part of the pipe-line. Laterally offset from the comnlon axis o~ the 20 pipeline and the pipe to be welded thereto is a store or accumulator operated for storing pipes to be welded and successively delivering them at the loading position.
The pipes are stacked in the accumula~or to extend pa-rallel with the pipeline, their loadin~ being e~fected 25 by a pipe-handling device moving a successive pipe into the position of abutting against the pipelins in a _~_ flat-parallel motion horizontally and vertically. The stability of the relative positions o~ the end of the pipeline and the pipe being welded thereto i9 main-tained throughout the weldin~ operation by the speoific deæign features of the barge and the procedure of its retaini~g relative to the bottom of the water re-servoir in question.
However, the productivity of the welding process performed by the last-described weldi~g complex is not 10 adequately high, as the electric-arc welding technology is characterized by a high input of manual labor and a considerable amount of the required auxiliary equip-ment whose accommodation in the limited workinæ space presents serious problems.
Resistance butt weldi~g as a technology signi-ficantly ~ore productive, providing for fine quality of welds and requiiing less bulky equipment has not been employed as yet in the environment of laying under-water pipelines.
However, the use of resistance butt welding mach-ine in the last-described complex of the prior art would have been ~ndered by the complexity of the task of ensuring strict axial alignment of the pipes bein~
joined under roll and pitch conditions, and also 25 by the fact that the insertion of a relatively elongaæed inter-pipe welding machine or of an internal b~rr-removing trimmer into the pipe to be welded requires additional worklnæ area which is at least equal to the respective lengths of the inter-pipe welding machine or of the internal triulmer lenKthwise of the oarrler Summarg of tbe Inv~tio~
It is the main object of the present invention to create an economioal and ef~icient welding complex for constructing continuous underwater pipelines, providing for fine quality of the welds.
It is a specific object of the present invention 10 to provide prerequisites for implementing the highly ef~icient technology of resistance butt welding of pipe sections in a limited ~pace of the carrier vessol sus-ceptible to roll and pitch.
~he term `'a pipe section" used here and herein-15 below is meant to describe a length of the pipe to bewelded to the pipeline at a single go. It may be a single pipe length or several pipe lengths pre-welded to~ether in advance for further handling.
~hese and other objects are attained in a welding 20 complex for construction of a continuous underwater pipeline, adapted to be installed aboard a ship, comp-riSing a welding machine positionable at a joint of the pipeline with a pipe section to be welded~ thereto~
burr-removingtrimmers positionable coaxially with the 25 pipeline for displacement relative thereto in the joint area, a support device for the end part of the pipeline, a rotatably mounted holding device for setting, Il 30q~70 holdlng and retaining the pipe section to be welded, the welding machine and the trimmers, axially aligned with the end part of the pipeline, an accumulator for storing and deliverlng su¢aessive pipe sections at a loadinæ position, laterally o~f~et ~rom the aommon axis of the pipeline and of the pipe section to be welded thereto~
In the welding complex in acoordance with the invention the holding device includes a platYorm movable along the common axis of the pipeline and o~ the pipe section to be welded thereto by the machine for resistan-`aé butt welding and a plate with a means for carrying the pipe section to be welded, mounted on a pivot car-ried by the platform for rotation between the loading 15 po9ition and the position of aligni~g the pipe section to be welded, and operatively connected with a drive for its rotation, the accumulator being mounted so that a pipe section bein~ delivered extends at anaDsle re-lative to the end part of the pipeline, for its longi-20 tudinal displacement from the accumula~or into the holding device upon the latter's plate havin~ been rota-ted into the loading position.
The disclosed structure of the welding comple~
provides for implementing resistance butt welding in 25 construction of continuous underwater pipelines, as the mobility of the platform carrying the whole welding equipment involved in the weldiLg operation enables 1 30947~
it to ~ollow the moving end o~ the pipelinR in combi-nation with the loading of successive pipe sections from the joint side, faasiblo owin~ to the dis¢losed arrangement o~ the accumulator and the desi~n of the rotatable plate, ensuring the accuraoy o~ the alignment and permanence of the gap between the edges being welded, and that with a reduced overall length of the equipment of the welding complex. ~urthermore, the diss-losed structure allows to handle longer pipe sections, ~hiah additionally enhances the efficienoy o~ the pipe-line construction procedure by reducing the number o~
the joints to be welded "on the site".
Depending on the len~th and diameter of pipe sec-tions to be welded, the resistance butt welding machine incorporated in the welding complex of the invention can be either an inter-pipe machine, i.e. a machine insertable into the pipes bein~ welded, or a machine for mounting externally on the pipes. In the ~irst-mentioned case it is preferably mounted on the rota-table plate, and in the second case, on the plat~ormof the holding device.
~ o simplify the structure o~ the holdin~ de~ice, it is expedient that the pivot for rotation of the plate of the holdi~g device should include the piston rod of a hydraulic cylinder mounted on the platform in axial alignment wi-th the common a~is of the pipe-line and o~ the pipe section to be welded thereto, at the side of th~ end o~ ~he pipe section opposit8 to itsend to be welded, there being preferably mounted at the side of the end to be welded on the platform at least one more hydraulic cylinder adapted to ooope-rate wi~h the plate in the position o~ ali~nin~ thepipe section to be welded, for assisting the first-men-tioned hydraulic cylinder in aligning the axis of the pipe section to be welded ~ith the axis of the pipeline in one and the same horizontal plane.
Brief Description of the Drawings The present invention will be further described in connection with its embodiments, with reference being made to the accompanying drawings, wherein:
FIG. 1 shows schematically a pipelaying barge having mounted thereon a welding complex embodying the inve~tion;
FIG. 2 shows schematically in more detail the ge-neral view of the weldin~ complex;
FIGS 3 and 4 show a view in plan of the welding complex, respectively, in the working and loading posi-tions;
FIG. 5 is a sec-tional view -taken on line V-V of FIG. 2;
FIG. 6 is a sectional view taken on li~e VI-VI
of FIG. 2;
FIG. 7 shows s~hematically the general ~iew of a modified e~bodiment of the welding complex in accor-dance with the invention.
_~_ Desoription o~ the Preferred ~mbodiments Referring now in particular to the appe~ded dra-wings, a welding complex 1 (FIG. 1) for constructing a continuous und~rwater pipeline 2 i~ mounted on the deck 3 of a barge 4. ~he complex 1 comprises a device 5 for supporting the end part of the pipeline 2, in the form of a roller table installed on the deck 3, and a holdin~ device 6 carrying an inter-pipe welding machine 7 (~IG. 2) for resiætance butt welding, clamping 1~ mechanisms 8 and 9, and an external burr-removin~
trimmer 10~ Laterally offset from the device 6 is an accumulator 11 (~IGS 3, 4) for storage and successive delivery of pipe sections 12 to be welded, each sec-tion being either a single pipe length or several pipe lengths pre-welded together for further handling.
The weldi~g complex 1 (~IG. 1) is supplied with power from a power station 13 (FIGS 3 and 4) mounted jointly with a control unit (not shown) on the deck 3 (~IG. 1) of the barge 4 and electrically connected with the inter-pipe welding machine ? via a rotatable boom 14 (FIG. 2) supporting a supply of power cable 15.
In accordance with the invention, the holding de-vice 6 includes a platform 16 mounted for reciprocation on the deck 3 along rails 17 extending axially of the pipeline 2. The platform 16 is associated ~ith an actu-ator 18 in the form of a power cylinder pivotally moun-_~_ 1 3(~9~7~
ted on th~ d~ck 3 ~nd having it~ pisto~ rod pivotallyconnected to the underside of the plat~orm 16 in the area of its wheels 19. Mounted for rota~ion on the plat~orm 16 about a vertiaal pivot 20 is a pl~te 21 with a ~ulde roller 22 mou~ted on its distal end for rolli~g along an arcuate rail 23 (FIG. 4) provided on the platform 16, as the plate 21 is rotated about the pivot 20. The plate 21 is associated with a drive 24 for its rotation in the form of a double-acting 10 hydraulic cylinder havin~ its housing pivotally mounted on the platform 16 and its piston rod pivo-tally joined to the plate 21.
Mounted on the plate 21 (FIG. 5) in the area of its pivot 20 is the motion mechanism 25 operatively 15 connected with a rod 26 carrying the inter-pipe welding machine 7 which can be any suitable known inter-pipe machine for resistance butt welding of pipes (D~,B, 2918082).
~he motion mechanism 25 o~ the present embodiment 2~ is a rack-and-pinion mechanism; however, it can be any other suitable mechanism for driving a member through a reciprocating motion, e.~. a hydraulic cy-linder. ~verlying the opposite, distal end of the plate 21 is a clamping mechanism 8 ~IG. 2) supported by 25 the platform 16 for retaining the pipe section 12 re-ceived about the welding machine 7 in its position of alignment with the pipeline 2, relative to ~he plat-form 16. The clampi~g meohanism 8 can be any 5Ui-table know~ appaxatus, 8. ~ an apparatus of the 9US-pension trolley type incorporated ln the k~own welding complex (SU, A, 904244), having its housi~g fast with the platform 16.
Mounted intermediate the motion mecha~ism 25 a~d the clamping mechanism 8 on the plate 21 is a device 27 ~or carryin~ the pipe section 12 to be welded, which 1~ in the presently described embodiment is in the form o~ a driven roller table facilitating axial adjustment of the pipe section 12.
In the preferred embodiment of the present in~e~-tion, the vertical pivot 20 of the plate is the piston rod of a hydraulic cylinder 28 (FIG. 5) fastened o~
the platform 16.
Underlyi~g the distal end of the plate 21 are hydraulio cylinders 29 (FIG. 6) and 30 mounted on the platform 16 and supporting the arcuate rail 23 on their 2~ piston rods. In their combination, the cylinders 28 to 30 present an arrangement for adjusting and cor-recting the position of the axis of the pipe section 12 to be welded relative to the axis of the end of the pipeline 2, i.e. for positive alignment of these two axes in one and the same horizontal plane. Positive alignment of these two axos in one and the same ver-tical plane is proYided for by the h~draulio o~linder 24 oapable of rotati~g the plate 21 (FIGS 3 and 4) and a mechanism ~1 (FIG 5) for its horizontal di3plaooment, including two h~draulic o~linder~ 32 ~d 33 mou~tod on the plate 21 and havi~g thoir pi~ton rods abuttiD3 against th~ housing of the mochanism 25 to the opposite sid~s of th~ rod 26.
The clamping meohanism 9 tFIGS 2 and 3) mou~ted on the platform 16 beyond tho outlin~ -o~ the plat~ 21 . .
10 is intanded for rctaining the platiorm 16 with ro~peot to tho end oi the pipeline 2 in the worki~g p~sition ~he me¢hanism 9 is preierabl~ o~ the same dosign as the clamping mechanism 8, its housing supporting ior axial raoiprocatio~ the ~xternal burr-romovin~ trimrur 10 15 oi a~ suitabl~ ~n~wn struoture` (US, A, 3657962).
The acoumulator 11 for atorage a~d suocessive de-li~er~ of pipe sections 12 to be welded, i an~sùitable ~nown structure ~DE,A~2364502), is iixedl~ secured on the deck 3 ~f the barge 4 alo~gside the platform 16 20 (FIGS 3 a~d 4) for the axis of the pipe seoti-n 12 being delivered, which is the l-ading p-sition of the welding complex 1, to extend at a~ anele ~C t- the axis of the pipeli~e 2 ~he vertex of the angle oC bel-~æs to the imaginar~ extensisn of ~he pipeline 2! be~-nd 25 its elld The actual ~lalue of the an~le o~ is selaoted from the ~erall l~;~out considerat~ s, to provide f-r 1 3`09~70 the m~nimum required ~paoe and mi~imized ~troke o~ the h~draulic c~linder 24 e~erahle ~or rotating the plate 21 throu~h thi~ angle; ho~ever, $n principle, this value oan be varied ln a fairl~ broad range.
~he acoumulat~r 11 is equipped with aorapi~ t-ol~
34 fer prèpari~ the e~ds ~ a pipe secti-n 12 i-r wel-ding.
FIG. 7 o~ the appended dra~lnæs illustratesschema-tlc~ a mo`d~gied embodiment cf the in~ention, with an e~ternall~ mountsd machine 35 ~or res$stance butt weldi~e incorporated in the welding complex 1 ins~ead of an in-ter-pipe machiue. ~he machine 35 can be of a~ suitable known structure (~Ej B~ 2332006).
~he eYternall~ mo~nted resistance butt ~eld~n~ maoh-15 .ine 35 is operativel~/ connected to the plat~orm 16 through the clampin~ mechani~m 8~ ~ith the motion mecha-nism 25 oi thig embodiment havin~ operati~elJ connected thereto a rod 36 ~ith an inter~lburr-remo~in~ trimmer 37 oi an~ suitable ~no~n structure (USj ~, 3745319~.
20 In other respects? this embodiment o~ the welding complex 1 is similar to the embodiment described herei~-above.
The ~eldinæ complex 1 of the pre~nt invention i9 operated, as follows.
~ pipe section 12 ~ith its ends treated in advanc~
b~ the scrapin~ tools 34 is deli~ered b~ th~ accumu-lator 11 (FIGS 3 and 4) to the Ioadi~position. Tbs - 1 3~9~7`0 dri~o 24 i~ onergizod to rotate the plate 21 ~ointl~
~ith the intor-pipe ~elding maohine 7 through the angle about the pivot 20 from the inltlal pooitio~ of allgnment of ths 6eometrio a~i~ o~ the lnter-pipe maohlne 7 ~lth the asi~ Or the pipeline 2. With the plate 21 thu~
robating, its rollor 22 19 guided b~ the arcuate rail 23.
Alternati~el~, ~hen the ~eldi~c compie~ 1 in¢orpo-rates the eYtornAll~ mounted ~oldl~g maohine 35, the lattor remain~ on the plat~orm 16 ~ith the plate 21 ro-10 tatin~, and the internal trimmer ~7 rotatos ~ointlywith the`plate 21.
In the loading position, the inter-pipe welding machine 7 (or, oo~respondinsl~; the internal trimmer ~7) i9 ¢oasial ~ith tho pipe section 12 ~hich i~ fsd b~
15 the dri~on roller tablo (not sho~n) underl~ing the-pipe section 12 on the accumulator 11 to movo onto the lnter-pips maahine 7 (or the internal trimmer 37).
The drive 24 is acti~ated in the re~erse direc-tlon, and the plate 21 jointl~ with the inter-pipe ~el-20 ding machine 7 (or thë-internal trimmer 37) and the pipe seotion 12 recelved thereabout i8 rotats~d into t~e in~tial position of alignment, abutting agaiD~t the hou-9ing of tho clamping mechanism 8.
~ho pipe section 12 i8 mo~ed aYiall~, ~ointl~
25 ~ith the inter-pipo ~eldiDæ machine 7 (or the internal trimmer 37) to~ards the pipeline 2 to abut again6t it8 end ~ace~ and l~ pre-clamped b~ the mochani~m 8, whereafter th~ro i9 ~ r~ormed positivo alignment of the aYls of the pipe se¢tion 12 with the axis oi the pipeline 2 in one a~d the ~qme horizontal plane by ~ointl~ operatins in ooordination the h~draullo c~-linders 28 to 30~ and ln one and the ~ame ~rtioalplane b~ ~o~ntl~ oparating in coordination the mecha-ni~m 31 ior horizontal displacoment oi the plat~ 21 and its rotation drivo 24. In the emhodiment with the inter-pip~ weldin6 machin~ 7, the motion meohani~m 25 i9 10 operated to project this ma¢hine 7 partly into the p~peli~e 2 b~ the regulred e~tent, to acqulre its wor~lng position with re~pect to the ~o~nt o~ the pipe-line 2 with the pipe aect~on 12, as sho~n in FI~S 2 and 31 wheroa~ter the corresponding mechanisms oi the 15 intor-pipe ~eldi~3 maohine 7 aro operatod ~or final centor~n~ and clamping Or the pipo seation 12 to be ~eldod ~ith respe¢t to the pipeline 2. Simultaneousl~, the olampin6 mechanism 8 i9 operated to release bhe pipe seetion 12.
In the embodiment with the e~ternally mountod wel-ding machine 35 (FIG. 7), the mechanism 25 is operated to pro3ect the internaI trimmer37 ~tothe pipeline 2 by the required o~tent, while the pipe section 12 i~ moved into the externally mounted pips-weldiDæ machine 35 25 ~or its ~inal centering and ¢lamping ~rom outside. ~he clampi~g mechanism 8 is operated to releaso the pipe seGbion 12, with the olamping mechani~m 9 beins in itswor~in6 ~tate o~ retainin6 the plat~orm 16 with respe¢t to the e~d o~ the pipeline 2.
Should a roll and/or pitoh 6ituatlon ma~e th~
barse ~ ~haft rclative to the pipeline 2, th~ latter in its oooperation with the platiorm 16 throu6h the clampi~æ-mechanl~m 9 and the clamp6 o~ elther the inter-pipe weldiDg machine 7 or the externally mounted welding machine 35 would ma~e the plat~orm 16 roll alo~6 the rails 17 jointly with the entire equipment of the welding complex 1 en6aged in the weldin~ prooe-dure. ~hus, the mobility of the platiorm 16 guarantee~
the reliability and accura¢y o~ the alisnme~t and per-manence o~ the pres~t relative aYlal positions o~ the weldsd ed6es o~ the pipe seotion 12 and pipeline 2.
Ii the plat~orm 16 is displaced in its wor~lng position from ~ts substantially ce~tral position length-wise of the rails 17, the actuator 18 is operated to reatore the plat~orm 10 to its central position provi-20 din6 the necessary latitude ~or welding on tolerablyrough seas. Otherwi~e, t~e actuator 18 func~ions as a hydraulic shoc~-absorber.
In the abovedeacribed wor~in~ position of the wel-din~ comple~ 1 either the inter-pipe machine 7 or the 25 èYternallg mounted welding machine 35 i8 operated to periorm the weldins o~ the joint in the speci~ied proce-dure.
With the weldin~ prooedure completed, the mecha-nism 25 i9 operated to retract oither the inter~pe weldlng machine ? or the inter~al trimmsr ~7 beyond the welded joint, remo~ing the in~ernal burrs (~lash).
External burrs (~lash) are removod by the external tri~mer 10, or else, in the embodiment with the ex-~ernally mounted welding machine 35, by a trimming device incorporated in the maohine 35.
~he clampiLg mechanism 9 is operated then for its 10 rollers to relea~e the pipeline 2 (and in th* embodi-ment with the e~ternally mounted weldinæ machine 35 the latte~ i9 also operated to release the pipeline 2), and the barge 4 is ad~anced through a rsquirèd distance relative to the pipeline 2 (with the last-mentioned pipe 15 section 12 welded thereto) whioh freely rolls along the roller table of the support de~ic~ 5, until the remote ; (iree) end of the last-welded pipe section 12 aoquires the position which is initial ior welding the ne~t aoint.
With the barge 4 arrested, the pipeline 2 is retained 20 once again relative to the platform 16 by the clamping meahanism 9, and the abovedescribed operating cycle i~
repeatèd.
It can be seen irom the abo~e description ~that the disclosed weldins oompleY is compact and reliable in operation. Its layou~ allows to reduce the length of the fipace occupied b~ the welding equipment and to cut down 1 3;~9~0 the amount o~ auxiliary equlpm~nt.
Considering that the incorporation of the rotatableplate has eliminated the neoesslty o~ retraotin6 the inter-pipe welding maohine (or the inter~l trlmmer) from the joint by the ~ull length of the successive pipe ~e¢tion to bs welded, the length of the lstter oan be stepped up, which provides for ha~g less 30ints to be welded "on the site". The abo~esa~d enhances the productivity o~ pipeline construction in addition to 10 the essentially higher ef~iciency attained o~i~g to the implementatio~ of resistanc~ butt weldiLg o~ pipes u~der offshore conditions. -
Claims (4)
1. A welding complex for construction of a con-tinuous underwater pipeline, adapted to be installed on the deck of a carrier vessel, comprising:
- means for supporting the end part of the pipeline;
- a machine for resistance butt welding positionable in the area of a joint of the pipeline with a pipe section to be molded thereto;
- trimming means positionable coaxially with the pipeline for motion relative thereto toward the joint area;
- rotatable holding means operable for setting, holding and retaining a pipe section to be welded, said resistance butt welding machine and said trimming means in axial alignment with the end part of the pipeline, including:
a platform reciprocable along the common axis of the pipeline and the pipe section to be welded thereto;
a plate mounted on a pivot means for rotation between a loading position and a pipe section aligning position, associated with a drive for its rotation;
means for carrying a pipe section to be welded, mounted on said plate;
- accumulating means adapted for storage and successive delivery of pipe sections at the loading position, laterally offset from the common axis of the pipeline and the pipe section aligned therewith, so that a pipe section being delivered extends at an angle relative to the end part of the pipeline for its longitudinal displacement from said accumulating means into said holding means, with said plate of said holding means having been rotated into the loading position.
- means for supporting the end part of the pipeline;
- a machine for resistance butt welding positionable in the area of a joint of the pipeline with a pipe section to be molded thereto;
- trimming means positionable coaxially with the pipeline for motion relative thereto toward the joint area;
- rotatable holding means operable for setting, holding and retaining a pipe section to be welded, said resistance butt welding machine and said trimming means in axial alignment with the end part of the pipeline, including:
a platform reciprocable along the common axis of the pipeline and the pipe section to be welded thereto;
a plate mounted on a pivot means for rotation between a loading position and a pipe section aligning position, associated with a drive for its rotation;
means for carrying a pipe section to be welded, mounted on said plate;
- accumulating means adapted for storage and successive delivery of pipe sections at the loading position, laterally offset from the common axis of the pipeline and the pipe section aligned therewith, so that a pipe section being delivered extends at an angle relative to the end part of the pipeline for its longitudinal displacement from said accumulating means into said holding means, with said plate of said holding means having been rotated into the loading position.
2. A welding complex according to claim 1, wherein said machine for resistance butt welding is a machine adapted to be received internally of the pipe to be wel-ded, mounted on said rotatable plate of said holding means.
3. A welding complex according to claim 1, wherein said machine for resistance butt welding is a machine adapted to be received externally on the pipe to be wel-ded, mounted on said reciprocable platform of said holding means.
4. A welding complex according to claim 1, comprising a hydraulic cylinder aligned with the common axis of the pipeline and the pipe section to be welded thereto at the side of the free end of said pipe section, having its piston rod affording said pivot means of said rotatable plate, and at least one more hydraulic cylinder mounted on said platform at the side of the joint end of said pipe section to be welded, having its piston rod cooperating with said rotatable plate in the posi-tion of aligning said pipe section to be welded, for as-sisting said first-mentioned hydraulic cylinder in aligning the axis of said pipe section to be welded with the axis of the pipeline in one and the same horizontal plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000578861A CA1309470C (en) | 1988-09-29 | 1988-09-29 | Welding complex |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000578861A CA1309470C (en) | 1988-09-29 | 1988-09-29 | Welding complex |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1309470C true CA1309470C (en) | 1992-10-27 |
Family
ID=4138815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000578861A Expired - Fee Related CA1309470C (en) | 1988-09-29 | 1988-09-29 | Welding complex |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1309470C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109822236A (en) * | 2019-04-04 | 2019-05-31 | 中国工程物理研究院机械制造工艺研究所 | It is a kind of for pipe cutting and the device of welding |
-
1988
- 1988-09-29 CA CA000578861A patent/CA1309470C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109822236A (en) * | 2019-04-04 | 2019-05-31 | 中国工程物理研究院机械制造工艺研究所 | It is a kind of for pipe cutting and the device of welding |
| CN109822236B (en) * | 2019-04-04 | 2023-11-28 | 中国工程物理研究院机械制造工艺研究所 | Device for cutting and welding pipeline |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100449097C (en) | Tower or silo frame section pairing method and pairing platform | |
| CA2312364C (en) | Rail welding apparatus incorporating rail restraining device, weld containment device and weld delivery unit | |
| DE2559532C3 (en) | Device for aligning and fixing the end of a pipeline and a pipe section to be welded to it | |
| EP3359329B1 (en) | Pipe crawling welding device with a rotatably coupled welding module ; method of welding pipes with such pipe crawling device | |
| CN115815950A (en) | Pipeline welding robot with distance adjusting function and pipeline welding method | |
| CN112139748A (en) | Rotatable steel pipe welding equipment | |
| CA1309470C (en) | Welding complex | |
| CN110883451A (en) | Four-gun intelligent welding equipment for straight pipe flange | |
| US4143801A (en) | Multiple welding head system for fabricating pipe | |
| US4910374A (en) | Welding complex | |
| CN208840759U (en) | Steel-pipe welding auxiliary processing device | |
| US10625345B1 (en) | Method and apparatus for repair drill pipe and other tubular goods, including threaded connections thereof | |
| US4015086A (en) | Hinged welding machine | |
| CN214816242U (en) | Clamp for auxiliary overturning of pipe joint | |
| CN210908432U (en) | Automatic brazing system of solar panel core frame | |
| DE3030421A1 (en) | Tractor jig for butt welding pipelines - where tractor has cardan mounting for frame used to align and rotate pipes and fitted with internal and external welding burners | |
| CN117862727B (en) | Automatic welding equipment for machine tool machining pipe fitting | |
| RU2478460C1 (en) | Universal tube assembly production unit | |
| CN217799758U (en) | Automatic welding device for butt joint of LNG (liquefied Natural gas) conveying pipelines | |
| CN215658361U (en) | Wind power tower cylinder concatenation inner joint welding processingequipment | |
| CN115008056B (en) | Welding device for mounting water-stop steel plate | |
| CN115283794B (en) | Welding equipment and welding method | |
| CN218946722U (en) | Flat top guide wheel for pre-welding machine | |
| CA1079815A (en) | Machine for the resistance butt welding of pipes | |
| CN211162537U (en) | Four-gun welding equipment for straight pipe flange |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |