DE2363727A1 - Plastic pipe fittings for weld connection - have radial and axial contact faces to form welding seam - Google Patents

Plastic pipe fittings for weld connection - have radial and axial contact faces to form welding seam

Info

Publication number
DE2363727A1
DE2363727A1 DE2363727A DE2363727A DE2363727A1 DE 2363727 A1 DE2363727 A1 DE 2363727A1 DE 2363727 A DE2363727 A DE 2363727A DE 2363727 A DE2363727 A DE 2363727A DE 2363727 A1 DE2363727 A1 DE 2363727A1
Authority
DE
Germany
Prior art keywords
pipe
welding
welding seam
radial
plastic pipe
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.)
Pending
Application number
DE2363727A
Other languages
German (de)
Inventor
Richard Schneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAENNINGER GmbH
Original Assignee
BAENNINGER GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BAENNINGER GmbH filed Critical BAENNINGER GmbH
Priority to DE2363727A priority Critical patent/DE2363727A1/en
Publication of DE2363727A1 publication Critical patent/DE2363727A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5223—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces
    • B29C66/52231—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces with a right angle, e.g. for making L-shaped pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

To connect plastic pipes and fittings by means of welding, a heating element comes into contact with the two areas which form the welding seam. In order to form a uniform welding seam between a pipe and a fitting, the fitting has a stepped location which after having been brought into a molten state, receives the pipe which is in the same plastic state. The internal and external welding seams which are obtained when the two parts are pressed together prevent the formation of cracks when the welding is subjected to bending stresses.

Description

PatentanwältePatent attorneys

DipL-ing. Helmut Missling 63 Giessen 19.12.1973 _ , , _. , , ο ι ι _ Bismarcketraese 43DipL-ing. Helmut Missling 63 Giessen December 19, 1973 _,, _. ,, ο ι ι _ Bismarcketraese 43

DipUng. Richard Schlee Telefon: (0641) 71019DipUng. Richard Schlee Telephone: (0641) 71019

Dr.-lng. Joachim BoeckerDr.-lng. Joachim Boecker

Mi/K 11.833Wed / K 11,833

Bänninger GmbH. 6300 Gießen, Erdkauterweg 17 Bänninger GmbH. 6300 Giessen, Erdkauterweg 17

Schweißbare Rohrfitting aus KunststoffWeldable pipe fittings made of plastic

Die Erfindung betrifft ein Verbindungsstück (Fitting) aus schweißbarem Kunststoff für das Zusammenfügen von Rohren.The invention relates to a connection piece (fitting) made of weldable plastic for joining pipes.

Das Zusammenfügen zweiter Rohrleitungen aus Kunststoff bzw. eines Fittings und einer Rohrleitung durch Stumpfschweißungen ist bekannt und wird üblicherweise so ausgeführt, daß die Stirnflächen der beiden zu verbindenden Enden mit Hilfe eines Heizelementes aufgeschmolzen und anschließend unter Druck zusammengefügt werden. Dabei bilden sich an der Rohrwand innen und außen mehr oder woniger ausgeprägte Schweißwülste aus.The joining of two pipes made of plastic or one Fittings and a pipeline by butt welding is known and is usually carried out so that the end faces of the two ends to be connected with the help of a heating element melted and then joined together under pressure. In the process, more form on the inside and outside of the pipe wall or more pronounced weld beads.

Die Groiie und Form dieser Schweißwülste hängt von den eingehaltenen Verfahrensbedingungen ab und von den Abmessungstoleranzen der beiden zu verschweißenden Bauteile, sowie von deren fertigungsbedingten Materialorientierungen. Das an den Stirnflächen aufgeschmolzene Material kann nach innen oder nach außen abgedrängt v/erden und so ungleiche Schweißwülste bilden. Als besonders nachteilig, insbesondere für die Zeitstandfestigkeit,The size and shape of these weld beads depend on the adhered to Process conditions from and on the dimensional tolerances of the two components to be welded, as well as their production-related material orientations. That on the front faces Melted material can be displaced inwards or outwards and thus form uneven weld beads. as particularly disadvantageous, especially for the creep rupture strength,

509826/0 U3 _2-509826/0 U3 _ 2 -

23G372723G3727

hat sich herausgestellt, daß sich in den Randzonen der Schweißwülste Kerben ausbilden, die bei Biegebeanspruchung Spannungsrisse auslösen können. Hinzu kommt, daß diese Schweißverbindungen zumeist im Freien ausgeführt werden und deshalb nicht immer die optimalen Schweißbedingungen eingehalten werden können. Die Folge ist, daß die Zeitstandsfestigkeit der verlegten Rohrleitungen in erheblichem Maße durch die Schweißnähte verringert werden kann.it has been found that in the edge zones of the weld beads Form notches that can trigger stress cracks when subjected to bending. In addition, these welded joints are mostly carried out outdoors and therefore the optimal welding conditions cannot always be maintained. the The result is that the creep strength of the pipelines laid is reduced to a considerable extent by the weld seams can be.

Der Erfindung liegt die Aufgabe zugrunde, die Festigkeit der Schweißverbindungen von Rohren untereinander oder von Rohren und Fittings aus schweißbarem Kunststoff gegenüber den bekannten Schweißverbindungen wesentlich zu erhöhen.The invention is based on the object of improving the strength of the welded joints between pipes or pipes and Fittings made of weldable plastic to increase significantly compared to the known welded connections.

Diese Aufgabe wird erfindungsgemäß durch ein Verbindungsstück aus schweißbarem Kunststoff gelöst, das dadurch gekennzeichnet ist, daß zumindest eine Stirnfläche des Verbindungsstückes eine Schulter mit zwei ringförmigen Anschweißflächen bildet. Diese Anschweißflächen liegen vorzugsweise zueinander.senkrecht und grenzen aneinander.According to the invention, this object is achieved by a connecting piece made of weldable plastic, which is characterized by is that at least one end face of the connecting piece forms a shoulder with two annular welding surfaces. These Welding surfaces are preferably perpendicular to one another and adjoin one another.

Bei einem Verbindungsstück gemäß der Erfindung werden aii.o nicht nur die Stirnflächen aufgeschmolzen und miteinander verbunden, sondern auch die Enden der überfläche des Ronres und die Innenfläche des entsprechenden Teiles dec Verbmdungs-In a connector according to the invention, aii.o Not only the end faces melted and connected to one another, but also the ends of the surface of the Ronres and the inner surface of the corresponding part of the connection

-3--3-

ORiGiNAL INSPECTED 509826/0U3ORiGiNAL INSPECTED 509826 / 0U3

stückes. Durch diese überlappende Schweißung wird einmal eine mögliche Verringerung des SchweißquerSchnitts, infolge ungünstiger Lage der Toleranzfelder, wie er beim bekannten Stumpfschweißverfahren auftreten kann, ausgeglichen und zum anderen werden Kerbausbildungen an der Außennaht, die zu Rissen führen können, vermieden.piece. As a result of this overlapping weld, a possible reduction in the weld cross-section is, as a result, less favorable Position of the tolerance fields, as can occur in the known butt welding process, balanced and on the other hand notches on the outer seam, which can lead to cracks, are avoided.

Die Erfindung betrifft weiter ein "Verfahren zur Verbindung von Rohren aus schweißbarem Kunststoff mit Hilfe von gleichfalls
aus schweißbarem Kunststoff bestehenden Verbindungsstücken. Das Verfahren ist erfindungsgemäß dadurch gekennzeichnet, daß das Rohr einmal in bekannter Weise mit seinen Stirnflächen und
zum anderen mit einem vorderen Teil seines Umfanges mit dem
Verbindungsstück verschweißt wird.The invention further relates to a "method for connecting pipes made of weldable plastic with the aid of likewise
connectors made of weldable plastic. The method according to the invention is characterized in that the pipe once in a known manner with its end faces and
on the other hand with a front part of its circumference with the
Connector is welded.

Ein Ausführungsbeispiel der Erfindung ist im folgenden anhand der Zeichnung näher beschrieben, in dieser zeigen:An exemplary embodiment of the invention is described in more detail below with reference to the drawing, in which:

Fig. 1 ein erfindungsgemäßes Verbindungsstück und ein
Ende eines mit diesem zu verschweißenden Rohres
teilweise im Schnitt,Fig. 1 shows a connector according to the invention and a
End of a pipe to be welded to this
partly in section,

Fig. 2 zwei mit Hilfe eines erfindungsgemäßen Verbindungsstückes verbundene Rohre undFig. 2 two pipes connected by means of a connector according to the invention and

50982 6/014 3 -4-50982 6/014 3 -4-

Fig. 3 das Aufschmelzen der Anschweißflächen mit Hilfe eines Heizelementes teilweise im Schnitt.3 shows the melting of the welding surfaces with the aid of a heating element, partially in section.

In Fig. 1 ist mit 1 ein Verbindungsstück insgesamt und mit 2 ein mit dem Verbindungsstück 1 zu verbindendes Rohr bezeichnet. Das Verbindungsstück 1 ist maßlich mit dem Rohr 2 abgestimmt. Der mittlere Teil 3 des Verbindungsstückes 1 besteht aus einem Abschnitt mit einer etwas größeren Wanddicke als das Rohr 2. An diesem Abschnitt sind zu beiden Seiten zwei Schultern 4, 5 angeformt, deren Innendurchmesser gleich oder etwas größer als der Außendurchmesser des Rohres 2 sind. Es sind jedoch auch Fittings mit mehr als zwei Schultern denkbar. Die Stirnfläche 6 des mittleren Teiles 3 des Verbindungsstückes 1 und die innere Mantelfläche 7 der Schultern 4, 5 bilden zwei Anschweißflächen, die mit dem Rohr 2 verbunden werden.In Fig. 1, 1 is a connecting piece as a whole and 2 is a pipe to be connected to the connecting piece 1 designated. The dimensions of the connecting piece 1 are matched to the pipe 2. The middle part 3 of the connector 1 consists of a section with a slightly larger wall thickness than pipe 2. At this section are on both sides two shoulders 4, 5 are integrally formed, the inner diameter of which is equal to or slightly larger than the outer diameter of the tube 2. However, fittings with more than two shoulders are also conceivable. The end face 6 of the central part 3 of the connector 1 and the inner jacket surface 7 of the shoulders 4, 5 form two weld-on surfaces that are connected to the pipe 2.

Die Anschweißflächen 6 und 7 der Schulter 4 und die Stirnfläche 8 und ein Teil 9 der Außenfläche des Rohres 2 sind mit einem in Fig. 3 gezeigten Heizelement 10 aufgeschmolzen worden. Beim Zusammenfügen der Schweißflächen 6, 7 und 8, 9 erhält man im Bereich der Schweißnaht eine Wanddicke, die größer ist als die Wanddicke des Rohres 2. Durch diese Ausbildung der Schweißnaht wird eine Kerbenbildung in der Biegezone der Naht verhindert.The welding surfaces 6 and 7 of the shoulder 4 and the end face 8 and a part 9 of the outer surface of the tube 2 are with a Heating element 10 shown in FIG. 3 has been melted. When joining the welding surfaces 6, 7 and 8, 9 is obtained one in the area of the weld seam a wall thickness that is greater than the wall thickness of the pipe 2. By this formation of the The weld seam prevents the formation of notches in the bending zone of the seam.

In Fig. 2 sind zwei mit Hilfe eines Verbindungsstückes 1 mit-In Fig. 2, two with the help of a connecting piece 1 are

509826/0143509826/0143

-5--5-

einander verbundene Rohre 2 gezeigt. Durch die überlappende Schweißung ist die Schweißnaht überdimensioniert, so daß im Bereich der Schweißnaht keine Schwächung 'der untereinander verbundenen Rohrleitungsteile eintritt. Da weiter sowohl die Stirnfläche des Rohres als auch ein Teil seiner Oberfläche mit dem Verbindungsstück 1 verschweißt ist, wird eine Kerbenbildung in der Biegezone der Schweißnaht verhindert. Darüber hinaus führt die vergrößerte Schweißnaht auch zu einer erhöhten Festigkeit.tubes 2 connected to one another are shown. Due to the overlapping weld, the weld seam is oversized, so that in the area of the weld seam there is no weakening of each other connected pipe parts occurs. As further both the end face of the pipe and part of its surface is welded to the connecting piece 1, the formation of notches in the bending zone of the weld seam is prevented. About that In addition, the enlarged weld also leads to increased strength.

In Fig. 3 ist ein Heizelement 10 für das gleichzeitige Aufschmelzen der Schweißflächen des Rohres 2 und des Verbindungsstückes 1 gezeigt. Das Heizelement 10 hat einen Heizkörper 11, der mit auswechselbaren Heizbüchsen 12, 13 versehen ist, die in Abhängigkeit der zu verschweißenden Rohre und Verbindungsstücke geformt sind. Die beiden Heizbüchsen 12, 13 haben eine kurze Baulänge, damit das Wärmegefälle innerhalb der Büchsen gering bleibt. Das vordere Ende 14 der Büchse 12 ist ringförmig und bildet zwei Anlageflächen 15, 16, die zur Anlage an der Schulter 4 des Verbindungsstückes 1 gelangen und dort die Flächen 6, 7 aufschmelzen. Das Verbindungsstück 13 bildet an seinen Enden eine Schulter 17 mit zwei Schweißflächen 18, 19, die zur Anlage an den Flächen 8, 9 des Rohres kommen. Nachdem die Schweißflächen des Rohres 2 und des Verbindungsstückes 1 ausreichend aufgeschmolzen sind, wird das Heizelement entfernt undIn Fig. 3 there is a heating element 10 for simultaneous melting of the welding surfaces of the pipe 2 and the connecting piece 1 are shown. The heating element 10 has a heating element 11, which is provided with exchangeable heating sleeves 12, 13, which depend on the pipes and connecting pieces to be welded are shaped. The two heating sleeves 12, 13 have a short overall length so that the heat gradient within the sleeves remains low. The front end 14 of the sleeve 12 is ring-shaped and forms two contact surfaces 15, 16, which for contact with the Get shoulder 4 of the connecting piece 1 and melt the surfaces 6, 7 there. The connector 13 forms its ends a shoulder 17 with two welding surfaces 18, 19 which come to rest on the surfaces 8, 9 of the pipe. after the Welding surfaces of the pipe 2 and the connecting piece 1 are sufficiently melted, the heating element is removed and

509 8-26/014 3 -6-509 8-26 / 014 3 -6-

di'e Rohrleitungsteile gegeneinander gedrüdt, wodurch in bekannter Weise eine Schweißung erzielt wird. Diese Schweißungen können bis zu einem Rohrdurchmesser von ca. 70 mm ohne Schwierigkeiten von Hand ausgeführt werden, darüber hinaus ist es jedoch vorteilhaft, eine Schweißvorrichtung zu benutzen. Das Material der Verbindungsstücke sollte dem der zu verschweißenden Rohre entsprechen.di'e pipeline parts pressed against each other, resulting in a well-known Way a weld is achieved. These welds can be made up to a pipe diameter of approx. 70 mm without difficulty be done by hand, but it is also advantageous to use a welding device. The material the connecting pieces should correspond to that of the pipes to be welded.

Das Verbindungsstück selbst kann im Gegensatz zu dem gezeigten Ausführungsbeispiel auch T-förmig oder winklig ausgeführt
sein oder jede andere geeignete Form haben. Voraussetzung ist nur, daß zumindest eine Stirnfläche des Verbindungsstückes
eine Schulter mit zwei ringförmigen Anschlußflächen bildet.In contrast to the exemplary embodiment shown, the connecting piece itself can also be T-shaped or angled
or any other suitable shape. The only requirement is that at least one end face of the connecting piece
forms a shoulder with two annular pads.

609826/01.43609826 / 01.43

Claims (3)

236372?236372? Patentansprüche:Patent claims: Verbindungsstück (Fitting) aus schweißbarem Kunststoff für das Zusammenfügen von Rohren, dadurch gekennzeichnet, daß zumindest eine Stirnfläche des Verbindungsstückes eine Schulter (4, 5) mit zwei ringförmigen Anschlußflächen (6, 7) bildeteConnection piece (fitting) made of weldable plastic for joining pipes, characterized in that at least one end face of the connecting piece has a Shoulder (4, 5) with two annular connecting surfaces (6, 7) formed 2. Verbindungsstück nach Anspruch 1, dadurch gekennzeichnet, daß die Anschlußflächen (6, 7) senkrecht zueinander liegen und aneinander angrenzen.2. Connection piece according to claim 1, characterized in that the connecting surfaces (6, 7) are perpendicular to one another and adjoin each other. 3. Verfahren zum Verbinden von Rohren aus schweißbarem Kunststoff mit Hilfe von gleichfalls aus schweißbarem Kunststoff bestehenden Verbindungsstücken, dadurch gekennzeichnet, daß das Rohr einmal in bekannter Weise mit seiner Stirnfläche und zum anderen mit einem vorderen Teil seines Umfanges mit dem Verbindungsstück verschweißt wird.3. Method for connecting pipes made of weldable plastic with the aid of likewise made of weldable plastic existing connecting pieces, characterized in that the pipe once in a known manner with its end face and on the other hand, a front part of its circumference is welded to the connecting piece. 50982 6 /0U350982 6 / 0U3
DE2363727A 1973-12-21 1973-12-21 Plastic pipe fittings for weld connection - have radial and axial contact faces to form welding seam Pending DE2363727A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2363727A DE2363727A1 (en) 1973-12-21 1973-12-21 Plastic pipe fittings for weld connection - have radial and axial contact faces to form welding seam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2363727A DE2363727A1 (en) 1973-12-21 1973-12-21 Plastic pipe fittings for weld connection - have radial and axial contact faces to form welding seam

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DE2363727A1 true DE2363727A1 (en) 1975-06-26

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245858A (en) * 1978-07-20 1981-01-20 Phillips Petroleum Company Conduit structure
US4326327A (en) * 1978-07-20 1982-04-27 Phillips Petroleum Company Method of assembling a conduit joint
DE4307704A1 (en) * 1993-03-11 1994-09-15 Wilhelm Hegler Process for welding pipe sections made of thermoplastic material
CN102606814A (en) * 2012-03-01 2012-07-25 汪仕斌 Novel reducing-preventive pipe fitting

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245858A (en) * 1978-07-20 1981-01-20 Phillips Petroleum Company Conduit structure
US4326327A (en) * 1978-07-20 1982-04-27 Phillips Petroleum Company Method of assembling a conduit joint
DE4307704A1 (en) * 1993-03-11 1994-09-15 Wilhelm Hegler Process for welding pipe sections made of thermoplastic material
CN102606814A (en) * 2012-03-01 2012-07-25 汪仕斌 Novel reducing-preventive pipe fitting

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