DE1540497A1 - Method and device for manufacturing electrical conductors - Google Patents

Description

Simplex Wire end Cable Company "Cambridge 39" Msse "/ USA Method and device for manufacturing electrical conductors

The invention relates to a method and an apparatus for manufacturing electrical conductors, in particular a process for the production of Ladders made of alkali and bradalkali metal, primarily of ladders, which consist of sodium, lithium and calcium and their alloys.

Although according to the invention, any conductor made of alkali and alkaline earth metal or corresponding alloys are made * but sodium and its alloys are preferred « and the following description is therefore rededicated to the formation of Hatrium leaders.

Electric conductors made from sodium have been proposed earlier, see the French reference document 361.Io2 (19o5). Conductors made of sodium have also been ₉ at least for experimental purposes, in the United States of America by Dr ₀ H. Ho Dow uses "where in this pail a melted hat *} rlum was poured into tubular steel sticks, which were later connected to one another and formed a long ladder. which considerably increased the • electrical resistance of the conductor "

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The main properties of sodium necessary for its application speaking in electrical conductors are its low cost, easy procurement, and low density; about that in addition, sodium has only a slightly weaker conductivity than copper. Other properties to consider when making a conductor from sodium include its strong responsiveness, which makes it necessary that the sodium conductor is slit against the entry of the atmosphere · The low tensile strength of sodium also limits the length of the conductor that can be used without a bracket or Support can be used and the high coefficient of thermal expansion of sodium also causes sodium with usual Cable sheathing materials not particularly well tolerated is or cooperates.

The task on which the invention is based is data *? derLn, To provide an on-going process for making a jacketed sodium conductor and a reinforced operating conductor to produce that in large ;. " unsupported or supported lengths are used Sheathed sodium conductor can be created, the difference in the coefficient of thermal expansion between the sodium core and the sheathing material

According to the invention, this object is achieved by dafi most consecutive bend from Uamentelungemete ^ lsl duroli consecutive Turning the Läugsr & nder i®a Band 1 »iin Bohr is deformed, Me the S & t ^ SfäiiAer close to each other, whereby

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the resulting iaht fades or eonetwie is connected. Liquid nitrogen is then injected into the borehole lungs of a path which is soldered to the axis of the pipe, and "was at a point that was behind the adhesion". Difficulties due to the differences between the thermal expansion coefficients of the Hatrium and the jacket material are thereby avoided , so that the pipe from the jacketed material is given an oval transverse opening. With such a design, the casing can compensate for the volume changes of the sodium inside by changing its shape to a flatter or very round cross-section, with the casing material and the sodium core remaining in intimate contact with one another from the temperature and the formation of cavities or cavities prevent. is * which increase the electrical resistance »

Because of the high reactivity of the sodium, further measures of the liquid in the sail are introduced into the tube in a protective gas atmosphere. Sas geiichmolsene sodium solidifies rapidly in the molded tube without external cooling _s and the head produced in this catfish can "ur Caution * but this is not necessarily required to be performed by a mold ₉ To Know One? S uniform continuous contact between the Ummantelungemeterial xmd ensure the sodium core "Further subsequent working holes can include the corrugation of the tube in order to increase the flexibility or pliability of the same <>

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For the veil that reinforced ladders are desired, weI a central core with a high tensile strength is provided, the during manufacture in the Bohr along its Däiigeaohse inserted and preferably in the middle of the drill hole in the installation position while the liquid sodium is introduced, "This knows E. B" is relieved by the fact that the nucleus is duroh a central opening is guided in the arrangement that the The sodium feed line is assigned to let »the central core» can with another version euoh at certain intervals have over its length posts that have a central opening, which takes up the core, beeltsen in at least three places that touch the inside of the formed tube »Such a core consists of a material such as steel or another material with a high tensile strength, which with the sodium does not react.

Another design that requires high strength 1st, consists of a multi-pair cable in which, according to the Batrlumlter and wires or cables manufactured in accordance with the invention with a high tensile strength roughly in the same catfish with each other are twisted, as is the case with the steel and aluminum luminescent conductors used today.

The pipe production according to the invention can be done by that the sheathing material initially in the form of a tape is passed through a row of rollers, which in Couples working together and limiting a path for the band " which causes the band to become curved or in increasing MbB

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curved lore, i.e. it has a krelafuralgic cross-section. The final union of dee Bohree can be done in a similar way duroh use of Bollen or by Hlndurohaohloken dea partially finished Bohrea «wipe a pair of coal blocks erreleht verden »the curved or curved, against each other» have overlying planes which the bands of the band su aemmcndrttoken and the Bohr forsjen. With the coal blocks can a peer of orphans who were cross orphaned to create the final ' Fix the Bohree's cross-wedge.

The saw is preventive due to Tertrohweieung under Sohutsgssatomosphere narrowed »To a continuous and even As a matter of fact, it is necessary that the disclaimer eo close as suglloh is brought up to the Labor Absohnitt, while the drill is closed.

The algae XStrius) becomes through a pipeline in the Bohr introduced the direct in the pipe production Tor de «Arbeitsabaohnltt is retired during the the drilling is closed, and the calibrated in the drilling eratreokt beyond the Yersohweieungsstelle along a path that runs parallel to Aohee des Bohree. Bas Bohr is here vorsttgswelse arranged vertically. Bas Sehutsgae can do duKh before parallel lines are introduced which extend into the bore extends to a point immediately above the outlet opening the line for the liquid latrlua lies. It let us not normally require the hatr! redirect within of the fiohrauablldungsberelohes, since duroh the threshold

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Process dta Bohr would be carried out so much that 4 ·· letrium Ubtr et In. WtTohe arrangement trfordtrlloh can evaluate »and dlt line auitrhtlb dt · EohreuablldungBbtvtioht · aufuhtlten depends on the length of the line and tone dtr ambient temperature.

The cladding material can be made of any metal or consist of an internal alloy, since it is completely non-reactive in relation to the atmosphere or another environment, in which the conductor can be inserted, aluminum and copper aind dlt ta btattn give suitable Utamantelunga-Mat ο lead » since dta latrium know how to form an alloy, let for them cases are suitable in which the formation of an eolöhtn Alloy at dtr Brlaßafläohe ewlachen dea Blelaentel and * e »Setrium nloht et or end 1st.

The invention will now also be based on the accompanying figures βuführ11oh described, all eue the Beaohrelbung and the details or features shown in the figures contribute to the solution of the task in accordance with the invention can and old of the villas eur patenting were taken up in the application.

Ea seigent

Pig. 1 unified perspective analogy unite components

sur performing the method according to the invention; Pig. 2 a Tellaneloht of the device shown in Figure 1,

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rig c J a Schnl'taneiaht en $ l:? ii £ '"ter line 3-3 in the Pig", 2; Pig. 4 shows a shell along the lines 4-4 in FIG. 2; Pig »5 a Schntl · isnsfcht esrSlsag dsr ..- inls 5-5 in de: ·: · Fig _e 2;

Pig. 6 a Yergstsssrte T iluneic ^ t - ^ c- ", shown in FIG Device »partly wise Ια

I ¹ Ig.'7 a rergraeerte Ttvilensl-sh '?; oine)? different execution of the device shown in FIG. 6, also partly in a section;

Pig »8 is a line along the line 8-8 in Figure 7 | jflgo 9 a side view oines Kobcls, partly in section, dee a further modified form of afora according to the invention deratellt;

Figure "Io a Sehnittaneiisht dea in Figure 9 geeeigten Kebele along dor Sohnittlinie Xo-Io ₉ which is laid en the point T s is the Utsmantelung verschweieet ä ^f);

3 »ig _o ll a cut easiest of an aueammengeseteten or a lot«

paired _{ladder P of} the hetritam ladder used the genäfi of the invention made

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ff

Aue of the figure 1 shows that an Uraentelunge-Hateriel, dee first has the Torah of a volume 12, and a standing turn 14 downwards through a first pipe threading 16, «Ine Endpipe-Yereohlvorrtehtung 2o and through a hollowness Hindu, which in this order length one vertical path are arranged »between the first Bohr-For» before direction 16 and the Rohr-Vereohluflvoriohtung 2o extends an injection unit 26 for the molten oil on the side In the partially completed tube »and axially downwards to a point above the Schwelßelnheit 22» the completed Conductor 21 is then led to a station 24 and subjected to a shaping process

As can be seen in particular from FIG. 2, the first Rohr-Formvorriehtung 16 a number of horizontal, side by side lying rotating pairs of ζusa-acting roles on, being the different berries of Rc Ilen in relation to one another aligned and with their axes horizontal and perein are stored to each other. The one satε of vertically oriented Rolling the series of horizontally aligned EU88 mi-acting pairs is indicated by the reference numbers 28, 29 and 3o marked while the endere set of vertically oriented Roll the series of pairs by the reference numbers 3i, 32 and 33 is marked «

The first pair of co-operating roles in the series, d.ho the upper roller 28 and the upper roller 31 (see. Figo 3) have a substantially cylindrical Torrn and are mounted on axes 34 and 37, which are in a horizontal plane

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BAD ORiGiNAL

cursing each other in such a way that ei oh the eyl in Irish Surfaces of the rollers 28 and 31 ebwälsen one another.

Bas the middle pair of balls in the row, i.e. reels 29 and 32 (see. Fig. 4) are similarly attached to axles 35 and 38, which are also aligned with each other on a horizontal plane. The pair's roll 29 is flattened or oval, while the roller 32 has a cylindrical shape »

In the case of the lower pair of rollers in the row, the lower one Roller 3o flattened or oval and the lower roller 33 has one sylindriaobe form (see Flg. 5). BIe rollers 3o and 33 are mounted on a pair of axles 36 and 39 which are in one horizontal plane tn Besug are aligned.

Each pair of the cooperating studs in the pipe-forming device 16 is a pair of bearing stoops 4o (cf. β. B. Flg. 3) assigned to the opposite ends of the Aohsenpear « on which in turn the one pair of co-operating roles are attached. Bie individual Legerböok * 4α have a pair of adjustable bearings, In which the ordered axes of the pairs of rollers are stored in such a way that they are correctly aligned with each other are. Bie Lagerböoke 4o are on a common vertical

Base plate 42 attached. Extends along one side of the base plate 42

each of the axes 37, 38 and 39 duroh its associated bearing block

4o to the outside and each Aohse carries a bevel gear 44. On the

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A drive shaft 54 is arranged on the same side of the base plate 42, which are stored in a vertical position in Legern 48, which is attached to the base plate 42 alnd. The drive shaft stretches alongside the row of cooperating Pairs of rollers and carries a number of bevel gears 5o, which are fastened on the shaft 54 and are arranged in such a way that they are in Engagement old the bevel gears 44, which are attached to the ends of the axes 37 to 39 inclusive. Through this Is a common drive for the Inner Hollen 31 to elnsohllesslloh 33 created. It is noted that the rollers are idle rollers up to and including 3o.

A motor 52 is attached to the base plate 42 and is connected to its drive shaft of the shaft 54 in order the soap rolls 31 to elneohlleeslloh 33 Ib are the same Direction of rotation to drive, so a tape that is held by the pairs of rollers E.g. en whose interacting surfaces are recorded, you progressively the pair of rolls 31, 28 sub pair of rolls 29 »32, IUB pair of rolls 3o, 33 and soles reading on the tube-facing device 2o (cf. Fig. 1) is moved on.

As pointed out above, the pipe forming apparatus serves 16 before θIlen to it, a fluffy bind 12 from Copper, aluminum or another suitable metallic UBBentelungsmsterlal and this bend 12 in the longitudinal direction fold into a tube 18 eu. For this purpose, the rollers 28 to 33 are encapsulated on their circumference with putty provided that are congruent in working pairs are arranged. When the tape 12 is folded into a tube 18

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or is to be transferred, which, as shown in Figure 1, the idle rollers apparent _{9 is} a twisted steel 14 rotates elnsohllesst so elnd 28 ₅ 29 and 3o extending with in Ümfengerlohtung grooves 56t 57 and 58 are provided, the sized Bind to receive the steel wire 14 and allow the wire 14, which is received by these grooves 56, 57 and 58, to pass the lobes 28V, 29 and 3o Jramio

The associated driven rollers 31, 32 and 33 are provided with grooves 59 * 6o and 61 running in the circumferential direction. The groove 59 of the roller 31 of the upper roller pair has a flat bottom and is also bornecoen that it engages the band 12 in such a way that when the band 12 and the steel wire 14 pass between the rollers 28 and 31, the lower surface The wire 14 lies centrally and immediately above the upper surface of the belt 12. The groove 6o in the roller 32 of the central pair of cooperating rollers in the pipe former 16 has a curved or concave bottom such that when a Belt 12 passes between the rollers 32 and 29, a slight transverse bending of the belt 12 due to the influence of the vvalen roller 29, which runs in the groove 6o, is achieved _{o The} groove 57 in turn holds the steel wire 14 centrally directly above the belt 12 _o Die Groove 61 in roller 33 corresponds to groove 6o, but si * has a more curved concave bottom to roll up tape 12 more in the transverse direction. The groove 58 in the roller 3o again holds the steel wire 14 centrally

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About the volume 12, the longer borders in this position are bent upwards that the cross-section of the band 12 almost semicircular 1st.

The partially completed pipe 18 becomes the pipe sealing device 2o fed. Such a one. In the figure 1 has a peer of coal BIOoken 7o on, which have opposite concave tellelllptleohe surfaces and are under spring tension, in one to exercise such a large back on the sides of the partially completed tube 18 that the bands of the band 12, the de between passes, are held in mooring. The coal blocks 7o are slidably held in rectangular housings 72, the on both seldom arranged the axis of the partially finished drilling and in the installation position with a pair of screws. 74 adjustable are held, which sit in support arms 75. The Ame 79 are by means of a pair of screws 77 on a rectangular, Plate 76 attached. The final quesehnltt of the drill is driven by a pair of thin rollers 78 and 79 (not shown) determined the calibration at right angles and at the same distance extend to the axis of the semi-finished pipe, with a roller provided on each side of the Eohlenblöoke 7o is. Wheat 78 and 79 are in two rectangular blocks 8o mounted, which in turn are fastened so that they can turn into the screws 74 "By turning the blocks So the offset of the Walssen 78 and 79 to the axis of the semi-finished pipe can be changed while the rollers 78 and 79 are kept at the same distance from this axis.

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ORIGINAL

Blocks 80 are held stationary for the correct setting duroh four screws 82 _f of which each extends through a provided with a threaded bore block 84 of each rare wall of the support arms are secured by a pair of screws 86. 75 in the lower part "

The tube 21 is preferably welded in an argon atmosphere in a light arc welding unit. Since this unit is γοη of the usual design, it is in the Pig. 1 only shown in general »In order to ensure an even seam, it is important that the sealing takes place as close as possible to the pipe closure device 2o ...

Between the Rohr-Formvor device 16 and the closure device An injection unit for the liquid sodium extends into the partially completed tube 18 along its axis to a point below that at which the seam is melted, in ■ de »cases in which the sodium conductor is a central Contains reinforcement elements, such as in Pig. 1 shown 1st, a steel wire 14, can be the unit for that Molten Hatrium can also be used to make the wire 14 to be fixed centrally within the tube 21. you in The molten sodium injection unit shown in Figures 1 and 6 has a series of elliptical, horizontal plates 9o, 91 and 92 running along the axis of the tube are arranged offset from one another, wherein

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.Ue plate 9o above the plate 91 and -the plate 92 below the plate 91 bofladet · BiQ plates 9o, 91 and 92 are in the installation position In Bosug each other through · vl «i? Connecting climga rods 94 Rafcarr fetched the old to the individual fleets 9o, 91 and 92 duroh a pear of hex nuts 96 are vsrbtuiden, Blno Line 99 for the melted ITatriusi era extends from aueoen in don nohr-Hörstollnngoberaloii duroh vertical aligned openings in the individual plates 9o, 91 and 92 to a point within the drill 21 below of the sliding unit 22. The plates 9o and 91 are above the Welding lotion 22 and the plate 92 are located below d '; r unit 22 »lobel the BohrverBChlufls-Torriohtung 2o

don plates % vm & 91 arranged lot. See a wide area, from the outside in the Bohrharatellberoich duroh. The plates 9o and 91 uiid endot en the plate 91 · The line will learn ζην Miifüimmg einea Sohutzgaees in dto zone above the ilatrlum - ^ - uifip ^ r-JtKstolle used, the UiafsngÄer plates 9a _t 91 and 92 is-fe ßo mossed that or the internal thermometer that has been prepared <mi Eohrea ttbö2? sin ~ stiffiBit, so <ia that the formation or formation of eolirs is not impaired. 3) 1 o plate 9o also has an era Io2, which sioh bub the partially finished drilling out • era tr © ok <; and a matching sttitearm Io4 is attached.

A modified ITstrlum-MHSgritzeinineit is shown in FIG. In the arrangement gasä3 of the 5 ¹ IgU? 7 Scan the same as in the Pig. 1-6 shown ¥ or3? Ieirfcung -yerwandet,

909881/0557 " ² ^ - BAD ORIGINAL

and the same defenses are provided for you, with that Exception * that the sodium injection device by a device ersetet 1st, which has a sleeve 110, which again above the Vereehlußvoriohtung 2o comprises a steel wire 14 and itself along the length of the pipe 18 up to a point which lies below the white unit 22. A couple of elliptical plates 112 and 114 are on the outside of the Sleeve Ho offset from one another at a planned distance attached, and ewar to the portion of the sleeve Ho that is below the sole unit 22 lies. They circumferences of plates 112 and and dimensioned so that they old the internal dimensions of the pipe 21 coincide inside and daduroh the Hilae Ho alt the enclosed Rotates 14 in the middle of the tube 21 while holding it. The sleeve Uo has also has an annular channel 116 sloh from the end the sleeve Ho below the sole belt 22 upwards until tight EU extends the upper end of the sleeve Ho, with the channel at this end is connected to a line 118, so that the geeohauLEene Hetriuo eu- and through the annular channel 116 can be inserted into the tube 21. A »wide line 12o extends down into the partially completed pipe length of a path which is aligned with the axis of the pipe, where the line 12o runs out in the plate 112. This line becomes Eur introduction of a protective gas into the formed tube above the Hetrlum injection point.

The Pig. 8 Selgt In a somewhat exaggerated representation Cross section of the conductor manufactured according to the invention ο How erislohtlloh, the conductor has an outer jacket tube 21

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■ It solidified sodium 122 and one centrally in the drill In order to stand up, turn 14 on. In practice it is elliptical Cross-section of the tube is not as strong as shown in FIG. 8 ο

The method according to the invention is carried out using the apparatus shown in Figures 1-8 so that continuously the belt 12 and the steel wire 14 in series through the pipe forvorrlohtung 16, the pipe spooling device 2o and the welding unit 22 are guided while continuously molten material through the lines 98 or 118 and a protective gas is introduced through the lines loo or 12o * External cooling to solidify the sodium is not necessary, as its melting point is 97.5 ° C and the liquid sodium only needs to be brought to this temperature or a few degrees above it in order for it to be the Bohr 18 can be potted o however the space Is limited, common cooling devices can be used. In a Neohfore operation in station 24 the conductor can be guided through a drawing die or with a Filling must be provided to ensure continuous contact between the coating and the sodium. A pulling device can also be provided at station 24, which pulls the finished conductor through the entire device.

The above description of the device shows that

that unlimited lengths of a sodium conductor according to the invention

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BATH ORIGINAL

can be formed, whereby the advantage is achieved dee dee liquid sodium in a closed casing can be introduced while it is towards the atmosphere duroh a protective cover is shielded, the weak one elliptical cross-section in which the casing, i.e. the drill is transferred, allows the sheath to be completely expand or contract the enclosed volume can, i.e. that the elliptical cross-section is more or less is embossed in order to adapt to the same extent or To create contraction of the sodium conductor as its temperature rises or falls. But it can also be a drill with a circular cross-section can be used, where in this case when the liquid cools down and coalesces Sodium the tube assumes an approximately elliptical cross-section. The application «toes pipe with a circular cross-section for a coating brings the risk that when the molten sodium is injected into the pipe, and the Temperature of the sodium inside the tube to a value rises above that at which the sodium is shed has been made possible, the sheathing can be torn open " The arrangement of a corrugated device with which the pipe, in which the sodium was poured, either in a place where the sodium is still liquid, or at one point which it feet let, is corrugated, also enables one Expansion and contraction of the tube to accommodate the expansion and contraction of the sodium Purely the pail that the pipe should be corrugated is therefore the Formation of a tube with an elliptical cross-section required at the point of sodium injection «,

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Another cable design is shown in Figures 9 and Io. In this case, wire posts are fastened to the steel wire 14 when the wire 14 runs from the tube-Porm-Vorriehtung 16 to the Rohrversohluflvorrichtung 20. FIG. 9 shows three such nozzles 13o, which are arranged offset from one another along the wire 14 Support 13o have radial fingers spaced around the open center of the support at equal arcuate intervals. The outer end of the individual fingers corresponds to the inner dimension of the drill 21 and the section of the support ζ wl a ο hen the adjacent fingers misleads the wire 14 and holds it in the middle of the tube 21. The use of devices, ζ .B _{0 of} the plates 9o, 91 and 92, two holding the wire 14 in the center of the drill are therefore superfluous. The wires remain in the conductor because they have little or no electrical resistance.

If, as in Flg. Io shown 1st, rotating supports 13o can be used the introduction of the Hatrium and the protective gas on the catfish erfigen that a pair of Lines are arranged along tracks that are aligned with the axis of the tube 21, the individual lines In the spaces between neighboring fingers of the Supports Γ5ο are arranged for this purpose so on the Rotates 14 are attached that their fingers lengthways

Turned. 14 »Iteinanaer fluohfn. 9 O 9 8 8 1 / O B 5

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BATH ORIGINAL

Although in the course of the above description the application of a central tension member was discussed, but let it be clear what that is Same process can be used to make a jacketed Manufacture sodium cable that does not have a central tension member without a significant change in the used Device required is “The one trained in these catfish Ladder can be used on its own in cases In which no high tensile strength is required, or one Number of such conductors can be in a compound or multi-pair conductors are used, for example around a thicker central wire, e.g. * an aluminum sheathed one Wire (i.e. a Sefeaä steal core with an aluminum shell), as shown in Fig. 11, can be wound. From this figure it can be seen that a twisted conductor with a central strand of wire 2oo is provided, that of six Wires 2ol enclosed 1st, which helically around the twisting cord 2oo are arranged. The wire strand 2oo consists of. an aluminum-coated wire, while the twisted strands 2ol Represent Hatrlum strands from an aluminum tube according to are sheathed as described below, with no wire or equivalent link being used. Other suitable Combinations that act as multi-pair or compound cables can be used are known to the professional world.

Numerous modifications to the above can be made Device can be made without the essence of the invention to change ο It can i;, B. other devices such as the rollers are used to spank the pipe,

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and the present invention is not intended to be limited to that shown in the accompanying drawings The arrangement shown in the drawings restricts "a". Ale one Further modification of the invention, it is also possible to drill Ewei in a double order, one inside the other, eu bring and isu weld aowle the gap with melted He tr ium to fill in «

Further, while the present description focuses on pure sodium, it is noted that binary alloys of sodium and potassium containing small amounts of potassium are well suited "when a sodium conductor with a lower melting point is obtained" sodium and potassium form one low temperatures ohmeise & ndes eutecticura when 22.7 percent by weight of sodium is contained. The reduction of the Scheelc point of raw sodium (97.5 ° C) is strongly promoted on these catfish even by small amounts of potassium. Similarly, seigen binary alloys of sodium and lithium, which only small amounts en Lithium (up au about 3 percentage by weight) containing an abrupt increase of the melting point (162 ⁰ C at 3 Nominal ElitePro ε ent en lithium) "Such alloys are therefore Well-suited for purposes where a sodium conductor with a significant melting point is desired.

In the case of lithium conductors, small amounts of sodium or potassium can be used as the melting point of lithium to degrade ο In the case of calcium ladders can be binary Llthlumleglorangen and Lithlum-sodium-ternary alloys used

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Claims (8)

Claims 1. Method of making a conductor with a conductive one Core made of an alkaline metal, a Brdaltcali-Mexall or Alloys thereof, and with a metallic core coating, d a d u r c h g e k β η η signifies that an unlimited Length of a metallic sheathing material in the The shape of a tape is sucked along a predetermined path and we process it in such a way that the tape passes through one after the other Bending of the longitudinal edges until they rest against each other in any case deformed into a pipe, the resulting mowing is closed ' and the sealed tube is charged with the core material, which is introduced in the molten state along a path, the one with the axis of the pipe's trajectory up to a point is aligned with the length of the axis that lies behind the point at which the seam is melted. 2. The method according to claim 1, characterized in that a steel wire parallel to the belt and aο close to the tape that the wire is fed into the tube lockable, and that the wire is in the middle of the tube is arranged. 3. The method according to claim 2, characterized in that the core material through a pipeline is introduced, and that the steel wire is centrally located within the Pipe is fixed by a device that the pipeline 90988 1/055 7
assigned. 4 · Method according to claims 2 or 3 »characterized in that the steel wire is centrally fixed within the pipe by a number of nozzles is «which are arranged offset from one another along the steel wire» that the supports have fingers that are in radial Stand out in the direction and bring the inner surface of the pipe. 5. The method according to claim 4, characterized in ~ draws that fingers on the neighboring supports be aligned so that a disruptive flow into the pipeline for introducing the core material is avoided. 6. The method according to claims 2-5 »characterized, that the steel wire is fixed centrally within the pipe by being threaded through a sleeve It is carried out along the axis of the stirring path from a point at which the longitudinal edges of the pipe are not yet in contact with one another, to a position that lies behind the one on which the seam is closed is that the sleeve is provided with an annular channel extending from the end of the sleeve that extends over the Point of the weld of the seam extends out, su a point that runs close to the other end of the sleeve and that the molten core material is introduced into the sleeve by means of a feed device. 7. The method according to one or more of the preceding claims, characterized in that 909881/0557 SAD ORJGiNAL 1 5A0497, ■ ■ ■■ ■ - η - ■■ ' Core material consists of sodium, 8. The method according to one or more of the preceding claims »dad u r c h ge ken η ζ e i e h η β t that the sheathing material is made of copper, aluminum or of Alloys thereof. 90988 1/0557 BAD OFUG! ^NAL Blank page