DE2426578C3

DE2426578C3 - Process for welding two clad workpieces to one another, using both an explosion welding process and a fusion welding process

Info

Publication number: DE2426578C3
Application number: DE19742426578
Authority: DE
Inventors: Nicolaas Abraham Roosendaal Zondag (Niederlande)
Original assignee: Explosive Metal Working Holland B.V, Roosendaal (Niederlande)
Priority date: 1973-06-08
Filing date: 1974-05-31
Publication date: 1978-01-26

Description

rangen beider Rohrstücke, sondern auch zwischen dem Endteil des Plattieningsrohres und dem Außenrohr jedes einzelnen Rohrstückes und zwischen beiden AuBenrohren eine gasdichte, spaltlose Verbindung. Es hat sich gezeigt, daß dieser günstige Erfolg nahezu unabhängig von den verwendeten Metallen der Plattierung und der AuBenrohrstücke ist, so daß auch die mit dem Schmelzschweißverfahren schwierigst schweißbaren Metalle für die Plattierungen verwendet werden können. Die in der üblichen Weise mit dem Schmelzschweißverfahren, d. h. elektrisch oder autogen, in der Umfaiigsnut zwischen den Außenrohren der Rohrstücke gebildete Schweißnaht dient nicht der gasdichten Abdichtung, sondern der gegenseitigen mechanischen Verbindung der Rohrstücke.wrestled both pipe pieces, but also between the end part of the Plattieningsrohres and the outer tube of each individual pipe section and a gas-tight, gap-free connection between the two outer pipes. It it has been shown that this favorable success is almost independent of the metals used Plating and the outer pipe pieces is so that too the metals, which are difficult to weld with the fusion welding process, are used for the cladding can be. In the usual way with the fusion welding process, i. H. electric or autogenous, The weld seam formed in the circumferential groove between the outer pipes of the pipe sections is not used gastight seal, but the mutual mechanical connection of the pipe sections.

Bemerkt wird, daß der US-PS 36 45 435 die Maßnahme zu entnehmen ist, daß die Enden der durch ein Sprengschweißverfahren miteinander zu verschweißenden Rohrstücke passend abgeschrägt werden können. Zur Ausführung dieses bekannten Verfahrens werden die Rohrenden über die ganze Wandstärke der Rohrstücke abgeschrägt Die Verbindung der Rohrstükke wird nur durch die Explosion einer Sprengladung hergestellt Auf die Sprengschweißung folgt keine Schmelzschweißung zur Erhaltung einer mechanisch sehr festen Verbindung.It is noted that the US-PS 36 45 435 the measure can be found that the ends of the through an explosion welding process to be beveled to match pipe sections to be welded together be able. To carry out this known method, the pipe ends over the entire wall thickness of the Pipe sections beveled The connection of the pipe sections is only possible by the explosion of an explosive charge produced No fusion welding follows the explosion welding in order to maintain a mechanical one very solid connection.

Aus der DT-PS 8 19 939 ist ein Verfahren zum Aneinanderschweißen zweier plattenförmiger nicht plattierter Werkstücke bekannt Nach diesem Verfahren werden die einander zugekehrten und aufeinander gedrückten Ränder dieser Werkstücke so abgeschrägt, daß an beiden Seiten der Naht zwischen den Werkstücken V-förmige Nuten gebildet werden, die durch ein Schmelzschweißverfahren gefüllt werden.From DT-PS 8 19 939 a method for welding two plate-shaped ones to one another is not clad workpieces known According to this process, the facing and one another pressed edges of these workpieces beveled so that on both sides of the seam between the Workpieces V-shaped grooves are formed, which are filled by a fusion welding process.

Die Erfindung wird anhand der Zeichnung eines Ausführungsbeispieles näher erläutert werden. In der Zeichnung zeigtThe invention will be explained in more detail with reference to the drawing of an exemplary embodiment. In the Drawing shows

F i g. 1 teilweise eine Ansicht, teilweise einen Axialschnitt eines Teiles einer aus aneinandergeschweißten Rohrstücken bestehenden Rohrleitung in kleinem Maßstabe,F i g. 1 partly a view, partly an axial section a part of a pipe consisting of pipe sections welded together in small Scale,

Fig.2 in natürlicher Größe einen Teil eines Axialschnittes zweier koaxial zueinander angeordneter Rohrstücke mit Innenplattierung, gerade bevor diese Rohrstücke erfindungsgemäß miteinander verbunden werden, und2 in natural size a part of an axial section of two coaxially arranged to one another Pipe pieces with inner plating, just before these pipe pieces are connected to one another according to the invention be, and

F i g. 3 in natürlicher Größe den Teil des Axialschnittes nach Fig. 1, nachdem die Rohrstücke miteinander verbunden worden find.F i g. 3 the part of the axial section in natural size according to Fig. 1, after the pipe pieces have been connected to one another find.

In F i g. 1 sind 1, 2 und 3 bei 4 und 5 aneinandergeschweißte Rohrstücke einer Rohrleitung, z. B. einer Leitung für den Transport von Mineralöl von Quellen im Meer zum trockenen Land. Solche Rohrstücke bestehen im Ausführungsbeispiel je aus einem verhältnismäßig starkwandigen Außenrohr 6 aus Stahl (z. B. bei einer Leitung mit einem Innendurchmesser von 150 mm aus einem Rohr mit einer Wandstärke von etwa 25 mm) und aus einem dünnwandigen Innenrohr 7 für die innere Plattierung der Rohrleitung, z. B. einem Innenrohr mit einer Wandstärke von 1 bis 2 mm. Dieses Plattierungsrohr 7 kann aus korrosionsfestem Metall, wie Chromstahl mit hohem Chromgehalt, Tantal, Titan, Zirkon, Legierungen solcher Metalle, usw. hergestellt sein.In Fig. 1 are 1, 2 and 3 at 4 and 5 welded pipe sections of a pipeline, z. B. one Pipeline for the transport of mineral oil from sources in the sea to dry land. Such pieces of pipe exist in the exemplary embodiment each made of a relatively thick-walled outer tube 6 made of steel (e.g. in the case of a Line with an inner diameter of 150 mm from a pipe with a wall thickness of about 25 mm) and from a thin-walled inner tube 7 for the inner plating of the pipeline, e.g. B. an inner tube with a wall thickness of 1 to 2 mm. This cladding tube 7 can be made of corrosion-resistant metal such as chrome steel with a high chromium content, tantalum, titanium, zirconium, alloys of such metals, etc.

For connecting the clad inside Pipe pieces with each other go in the from Fig.2

ersichtlichen Weise vor: Das linke Rohrstück 8,9 wird an seh.em rechten Ende mit einem kegelstumpfförmigen, nach außen sich erweiternden Hohlraum 10, der sich nur über die ganze Stärke des Plattieningsrohres 9apparent way: The left pipe section 8.9 is at the right end with a frustoconical, outwardly widening cavity 10, which extends only over the entire thickness of the plate tube 9

ίο und über einen kleinen Teil der Stärke des Außenrohresίο and about a small part of the thickness of the outer tube

8 erstreckt versehen und bei 11 abgeschrägt Das rechte Rohrstück 12,13 wird mit einem in diesem Hohlraum 10 passenden kegelstumpfförmigen Endteil 14, der sich über die ganze Stärke des Plattierungsrohres 13 und über einen kleinen Teil der Stärke des Außenrohres 12 erstreckt versehen und bei 15 abgeschrägt8 extends provided and beveled at 11 the right Pipe section 12,13 is provided with a frustoconical end part 14 which fits in this cavity 10 and which is over the entire thickness of the cladding tube 13 and over a small part of the thickness of the outer tube 12 extends provided and beveled at 15

Nachdem eine sich auf einen ringförmigen Träger 16 befindliche ringförmige explosive Ladung 17 mit einer Zündvorrichtung 18 und einer dünnen Deckschicht 19, von welcher Ladung die Länge gleich derjenigen des kegelförmigen Hohlraumes 10 und des kegelförmigen Endteiles 14 ist, in diesen Endteil eingeführt worden ist, werden die Rohrstücke 8,9 und 12,13 in einen aus zwei mit Löchern 20 für Verbindungsbolzen versehenenAfter a ring-shaped explosive charge 17 located on an annular carrier 16 with a Ignition device 18 and a thin cover layer 19, the length of which is equal to that of the charge conical cavity 10 and the conical end part 14 has been introduced into this end part, the pipe sections 8,9 and 12,13 become one of two provided with holes 20 for connecting bolts

2s Hälften bestehenden Stützblock 21 gefaßt. Dabei kommen die schrägen Flächen 11 und 15 gegen eine Innenrippe 22 mit dreieckigem Querschnitt des Blockes 21 zu liegen, und zwar so, daß zwischen der kegelförmigen Fläche des Hohlraumes 10 und der des2s halves existing support block 21 taken. Included come the inclined surfaces 11 and 15 against an inner rib 22 with a triangular cross-section of the block 21 to lie in such a way that between the conical surface of the cavity 10 and that of the

End part 14 a narrow gap 23 remains free

Weiter wird empfohlen, die Außenrohre 8, 12 im voraus bei 24 und 25 ein wenig auszudrehen, so daß an diesen Stellen Spalte zwischen den Plattierungsrohren 9,13 und den Außenrohren 8,12 entstehen.It is also recommended to screw out the outer tubes 8, 12 a little in advance at 24 and 25, so that on These places create gaps between the cladding tubes 9, 13 and the outer tubes 8, 12.

If the pipe sections 8,

9 und 12,13 die Ladung 17 gezündet so wird zwischen beiden Plattierungsrohren 9 und 13, zwischen dem Plattierungsrohr 9 und dem Außenrohr 8, zwischen dem Plattierungsrohr 13 und dem Außenrohr 12 und zwischen beiden Außenrohren 8 und 12 eine Verbindung 26, 27, 28 bzw. 29 hergestellt (Fig.3). Diese vier durch eine einzige Explosion hergestellten Verbindungen gewährleisten eine gasdichte Barriere zwischen dem Inneren der Rohrleitung und den Fugen zwischen den Plattierungsrohren 9,13 und den Außenrohren 8,12 und sie bilden gleichzeitig eine Grundverbindung zwischen den Rohrstücken 8,9 und 12,13.9 and 12,13 the charge 17 is ignited so between the two plating tubes 9 and 13, between the Cladding tube 9 and the outer tube 8, between the cladding tube 13 and the outer tube 12 and A connection 26, 27, 28 and 29 is established between the two outer tubes 8 and 12 (FIG. 3). These four Connections made by a single explosion ensure a gas-tight barrier between the interior of the pipeline and the joints between the cladding tubes 9, 13 and the outer tubes 8, 12 and at the same time they form a basic connection between the pipe sections 8,9 and 12,13.

Nach der Zündung der explosiven Ladung 17 wird der Stützblock 21, 22 entfernt und die durch die schrägen Flächen 11,15 begrenzte Umfangsnut wird danach mit einem Schmelzschweißverfahren, d.h. elektrisch oder autogen, mit Schweißmaterial 30 gefüllt. Dieses Schweißmaterial dient nur der mechanischen Verbindung beider Rohrstücke 8,9 und 12,13.After the detonation of the explosive charge 17, the support block 21, 22 is removed and the through the inclined Areas 11,15 limited circumferential groove is then with a fusion welding process, i.e. electrically or autogenous, filled with welding material 30. This welding material is only used for the mechanical connection both pipe sections 8,9 and 12,13.

Je spitzer der Scheitelwinkel des kegelförmigen Hohlraumes 10 und des kegelförmigen Endteiles 14 ist, um so länger sind die mit dem Sprengschweißverfahren aneinander zu schweißenden Überlappungen und um so leichter kann man die Verbindungen 26, 27, 28, 29 herstellen.The more acute the apex angle of the conical cavity 10 and the conical end part 14, the longer are the overlaps to be welded to one another with the explosion welding process and so Connections 26, 27, 28, 29 can be made more easily.

1 sheet of drawings

Claims

Patent claim:

Method for welding two workpieces with their end edges to one another, which workpieces each from a metal part with a relatively large wall thickness and from one the one The surface of this part covering, relatively thin plating made of corrosion-resistant Made of metal, the cladding of both workpieces by an explosion welding process with each other and with the first-mentioned workpiece parts and this TeDe by a fusion welding process be connected to each other, thereby characterized in that for the connection of two tubular pieces, each consisting of an outer tube (8, 12) with inner plating (9, 13) existing work pieces the one or first pipe section (8, 9) on his the other or second pipe section (12, 13) facing end and in the vicinity of the same with one connected to its cylindrical cavity coaxially, extends over the entire strength of its Plating and extending over part of the thickness of its outer tube to this end provided at this end widening, frustoconical cavity (10) and from its outer surface beveled from the outer edge of this cavity (at 11), the second pipe section (12,13) at its the first pipe section (8,9) facing end and in the vicinity of the same with a frustoconical in the Matching cavity of the first pipe piece, spread over part of the thickness of its outer pipe (12) and over the entire thickness of its cladding (13) extending, coaxial, frustoconical End part (14) provided and from its outer surface to the foot of this frustoconical end part beveled (at 15), in the cylindrical cavity of the conical end part of the second pipe section an explosive charge (17) with sufficient force to produce an explosive weld joint between all in itself after the introduction of this end part (14) in this conical cavity (10) between the ends of this cavity (10) and this end part (14) extending line part arranged adjacent surfaces of the outer tubes and the claddings and the second Pipe section with its frustoconical end part (14) into the frustoconical cavity of the first pipe section is introduced, the pipe sections so executed and with respect to each other placed that between the faces of each pair by the explosion welding process together There is a narrow gap (23) to be connected to the surfaces, both pipe sections, if necessary, at the Place the connection in a composed of parts support block (21) are taken, the Explosive charge (17) detonated, this support block, if used, removed and the bevelled through the Parts (U, 15) of the outer tubes (8, 12) of both tube pieces limited U.nfangsnut by means of a Fusion welding process is fully welded.

The invention relates to a method for welding two workpieces with their end edges each other, which workpieces each consist of a metal part with a relatively large wall thickness and from a relatively thin, corrosion-resistant plating that covers one surface of this part Made of metal, the cladding of both workpieces by an explosion welding process with each other and with the first-mentioned workpiece parts and these parts by a fusion welding process be connected to each other.

Such a method is from the journal "Schweiß und Schneid", 25 (1973), issue 2, pages 58, 59, known This well-known combined explosion and fusion welding process is only used for connection Flat clad plates applied. Pipe sections of a pipeline with corrosion-resistant inner cladding are welded to one another, there is a risk of leaking weld seams the leaked medium in the joint between the corrosion-resistant inner cladding and the outer pipe a high pressure is generated, which when the pressure in the pipeline is removed, the thin-walled cladding pipe can compress locally.

The invention is now based on the object of the combined explosion and fusion welding process for connecting two tubular pieces, each consisting of an outer tube with inner cladding

2s pieces to carry out that the risk mentioned completely is eliminated. According to the invention this is achieved in that the one or first piece of pipe on his the other or second pipe section facing end and in the vicinity of the same with one at his cylindrical cavity connected coaxially, extending over the whole thickness of its plating and over a Part of the strength of its outer tube extending to this end, widening to this end, provided frustoconical cavity and from its outer surface to the outer edge of this cavity beveled, the second pipe section at its end facing the first pipe section and in the vicinity the same with a fitting in the frustoconical cavity of the first pipe section over part of the thickness of its outer tube and over the entire thickness of its cladding extending, coaxial, provided frustoconical end portion and from its outer surface to the foot of this frustoconical End part beveled, in the cylindrical hollow

_4S space of the conical end part of the second pipe section an explosive charge with sufficient force to produce an explosive weld connection between all of the adjoining surfaces of the outer pipes and the cladding arranged after the introduction of this end part in this conical cavity between the ends of this cavity and this end part, and the second pipe section with its frustoconical end part into the frustoconical cavity of the first pipe

S ₅ piece is inserted, the pipe pieces are designed and placed in relation to one another that there is a narrow gap between the surfaces of each pair of surfaces to be connected by the explosion welding process, both pipe pieces, if necessary, at the point of connection into one Parts assembled support block are taken, the explosive charge detonated, this support block, if used, removed and the circumferential groove delimited by the beveled parts of the outer tubes of both tube pieces is fully welded by means of a fusion welding process. The explosion of the explosive charge used in the blast welding process not only creates between the tubular plate