DE1291109B - Process for welding plastic pipes and welded joint formed according to the process - Google Patents

Process for welding plastic pipes and welded joint formed according to the process

Info

Publication number
DE1291109B
DE1291109B DED44930A DED0044930A DE1291109B DE 1291109 B DE1291109 B DE 1291109B DE D44930 A DED44930 A DE D44930A DE D0044930 A DED0044930 A DE D0044930A DE 1291109 B DE1291109 B DE 1291109B
Authority
DE
Germany
Prior art keywords
wire
connection according
welded connection
welding
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
DED44930A
Other languages
German (de)
Inventor
Gathmann Wilhelm
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.)
Deutsche Tecalemit GmbH
Original Assignee
Deutsche Tecalemit 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 Deutsche Tecalemit GmbH filed Critical Deutsche Tecalemit GmbH
Priority to DED44930A priority Critical patent/DE1291109B/en
Priority to FR37014A priority patent/FR1473009A/en
Publication of DE1291109B publication Critical patent/DE1291109B/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00Producing tubular articles
    • B29D23/001Pipes; Pipe joints
    • B29D23/003Pipe joints, e.g. straight joints
    • B29D23/005Pipe joints, e.g. straight joints provided with electrical wiring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0078Measures or configurations for obtaining anchoring effects in the contact areas between layers
    • B29C37/0082Mechanical anchoring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3628Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding said at least a single wire having a waveform, e.g. a sinusoidal form
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3632Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/364Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a woven or non-woven fabric or being a mesh
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3644Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a ribbon, band or strip
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/565Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits involving interference fits, e.g. force-fits or press-fits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122Joint 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
    • B29C66/1222Joint 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122Joint 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
    • B29C66/1224Joint 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/341Measures for intermixing the material of the joint interlayer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/342Preventing air-inclusions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General 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
    • B29C66/51Joining 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
    • B29C66/52Joining tubular articles, bars or profiled elements
    • B29C66/522Joining tubular articles
    • B29C66/5221Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General 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
    • B29C66/51Joining 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
    • B29C66/52Joining tubular articles, bars or profiled elements
    • B29C66/522Joining tubular articles
    • B29C66/5224Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
    • B29C66/52241Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces with two right angles, e.g. for making T-shaped pieces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General 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
    • B29C66/51Joining 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
    • B29C66/52Joining tubular articles, bars or profiled elements
    • B29C66/522Joining tubular articles
    • B29C66/5229Joining tubular articles involving the use of a socket
    • B29C66/52291Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General 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
    • B29C66/51Joining 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
    • B29C66/52Joining tubular articles, bars or profiled elements
    • B29C66/522Joining tubular articles
    • B29C66/5229Joining tubular articles involving the use of a socket
    • B29C66/52296Joining tubular articles involving the use of a socket said socket comprising sealing elements, e.g. gaskets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3644Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a ribbon, band or strip
    • B29C65/3648Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a ribbon, band or strip said strip being perforated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/303Particular design of joint configurations the joint involving an anchoring effect
    • B29C66/3034Particular design of joint configurations the joint involving an anchoring effect making use of additional elements, e.g. meshes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General 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
    • B29C66/71General 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 composition of the plastics material of the parts to be joined

Description

Die Erfindung bezieht sich auf ein Verfahren zum Verschweißen von Kunststoffrohren und auf eine nach dem Verfahren ausgebildete Schweißverbindung, und zwar insbesondere zur Verbindung von Rohren geringen Durchmessers und geringer Wandstärke. The invention relates to a method for welding Plastic pipes and a welded joint formed according to the process, in particular for the connection of pipes of small diameter and smaller Wall thickness.

Es sind schon verschiedene Methoden bekannt, um Rohre, vorzugsweise Kunststoffrohre, miteinander mit Hilfe von die Rohrenden übergreifenden Verbindungsstücken zu verbinden. Beispielsweise hat man die Verbindung im Wege der Verklebung mit Hilfe geeigneter Lösungsmittel versucht; diese Methode besitzt den Nachteil, daß sie keine ausreichend dichtende Verbindung darstellt, wenn die Kunststoffrohre mit hohen Drücken beaufschlagt werden; außerdem ist auch eine ausreichende Sicherheit gegen Zugbeanspruchung nicht gewährleistet, auch eine sofortige Belastung der Verbindung ist nicht möglich. Eine andere Methode besteht in der Verschweißung der zu verbindenden Rohrteile mittels einer Heißluftpistole, durch die die zu verschweißende Stellung von außen auf den Erweichungspunkt erhitzt werden. Bei dieser Methode muß mit größter Sorgfalt gearbeitet werden, um die erforderlichen Temperaturen in bestimmter Breite und Tiefe genau einzuhalten. Das Verfahren ist zeitraubend und gewährleistet nicht die Erreichung der erforderlichen Festigkeit bei Kunststoffrohren, die großen Innendrücken unterworfen sind; sehr schwierig ist die Anwendung dieser Methode bei dünnwandigen Rohren, da die Gefahr einer nachteiligen Beeinflussung des Gefüges besteht. Various methods are already known to make pipes, preferably Plastic pipes, with the help of connecting pieces that cross the pipe ends connect to. For example, one has the connection by way of gluing with the help tried a suitable solvent; this method has the disadvantage that it does not represents a sufficiently tight connection when the plastic pipes are exposed to high pressures be acted upon; in addition, there is also sufficient security against tensile stress not guaranteed, an immediate load on the connection is not possible. Another method consists in welding the pipe parts to be connected by means of a hot air gun, through which the position to be welded from the outside on the Softening point are heated. Great care must be taken with this method be to the required temperatures in certain latitude and depth exactly to be observed. The procedure is time consuming and does not guarantee achievement the strength required for plastic pipes that are subject to high internal pressures are; It is very difficult to use this method with thin-walled pipes because there is a risk of adversely affecting the structure.

Man hat auch schon vorgeschlagen, die Trennstellen der Kunststoffteile an heißen Metallteilen zu erhitzen und die Verbindung durch nachträgliches Ineinanderschieben zu erreichen, wobei eine Verschweißung der ineinandergeschobenen Teile erfolgen soll. Auch hierbei ist allergrößte Sorgfalt erforderlich, um die notwendigen Temperaturen genau zu erreichen; diese Methode ist ebenfalls zeitraubend und gewährleistet keine ausreichende Festigkeit in der Schweißzone, außerdem besteht bei dünnwandigen Rohren die Gefahr einer nachteiligen Gefügebeeinflussung. Man hat auch schon vorgeschlagen, die miteinander zu verbindenden Teile durch gegenseitige Drehung bis zur Erweichungstemperatur zu erhitzen und verschweißen zu lassen. It has also already been suggested that the separation points of the plastic parts to heat on hot metal parts and the connection by subsequently sliding into one another to achieve, with a welding of the nested parts take place target. Here, too, the greatest care is required to maintain the necessary temperatures to reach exactly; this method is also time consuming and does not guarantee any there is sufficient strength in the weld zone, and there is also thin-walled pipes the risk of a negative influence on the structure. It has already been suggested the parts to be joined by mutual rotation up to the softening temperature to be heated and welded.

Eine derartige Methode ist nur bei kleinen Teilen möglich; die Verschweißung langer Rohre ist wegen der Unhandlichkeit nicht durchführbar; außerdem können Winkelstücke nicht mit Rohren vereinigt werden. Auch dieses Verfahren bietet die gleichen Nachteile wie die vorgenannten. Such a method is only possible for small parts; the welding long pipes are not feasible because of their unwieldiness; you can also use elbows not be associated with pipes. This method also has the same disadvantages like the above.

Ein weiteres bekanntes Verfahren arbeitet mit elektrischer Erhitzung eines Widerstandsdrahtes. Hierbei wird in einem der zu verbindenden Teile eine Drahtwendel eingespritzt, die von außen durch elektrischen Strom erhitzt wird. Durch die Erhitzung der Drahtwendel wird das Material der zu verschweißenden Teile an den Trennflächen erweicht und verschweißt. Another known method uses electrical heating a resistance wire. A wire helix is used in one of the parts to be connected injected, which is heated externally by an electric current. By heating the wire helix becomes the material of the parts to be welded at the parting surfaces softened and welded.

Hierbei ist eine Doppelwendel erforderlich, deren beide Enden nach außen herausgeführt sind, um an eine Stromquelle angeschlossen zu werden. Diese Wendeln sind dem Korrosionsangriff von außen ausgesetzt. Eine Dichtigkeit zwischen den verbundenen Teilen läßt sich hierbei nur dann erreichen, wenn die Schweißzonen der benachbarten Drähte ineinander übergehen. Ist dies nicht der Fall, so besteht zwischen den Drähten ein schraubenlinienförmiger Bereich, in dem die beiden Drähte nicht miteinander verbunden sind, wodurch sich bei Kunststoffleitungen, die unter hohem Druck stehen, eine Leckstelle ergibt. Wenn zuverlässige Dichtigkeit und hohe Festigkeit der Verbindungsstelle erreicht werden soll, ist diese Verbindungsart, insbesondere bei Rohren kleineren Durchmessers, nicht geeignet.A double helix is required here, both ends of which are after are led out to be connected to a power source. These Coils are exposed to corrosion from the outside. A tightness between the connected parts can only be reached if the welding zones of the neighboring wires merge into one another. If this is not the case, then there is between the wires a helical area in which the two wires are not connected to each other, which in the case of plastic pipes that are underneath high pressure results in a leak. If reliable tightness and high Strength of the connection point is to be achieved, this type of connection is especially not suitable for pipes with a smaller diameter.

Es ist auch schon bekannt, miteinander zu verbindende Rohre auf elektroinduktivem Wege zu verschweißen; hier hat man zunächst die stirnseitige Verschweißung vorgeschlagen, bei der ein Metallring oder Metalldraht verwendet wird, der an der Stirnfläche des Rohres anliegt und aus einer auf den zu verschweißenden Kunststoff abgestimmten Metallegierung besteht. Die Metalleinlage wird durch eine Induktionsspule erhitzt und geschmolzen. Nach Erreichen der Schmelztemperatur des Metalls und des Kunststoffes werden die Rohrenden gegeneinandergepreßt, so daß das geschmolzene Metall herausgedrückt wird und die geschmolzenen Stirnflächen fest miteinander verbunden werden. Dieses Verfahren läßt sich nicht für Rohre mit kleinen Durchmessern und hohen Drücken anwenden, da durch die stirnseitige Verschweißung eine für die Belastbarkeit des Rohres nachteilige Gefügeänderung eintritt. Auch die Beseitigung des geschmolzenen Metalls macht Schwierigkeiten, da etwaige Rückstände die Dichtigkeit in Frage stellen. In keinem Fall läßt sich diese Methode bei dünnwandigen Rohren anwenden, bei denen aus naheliegenden Gründen eine stirnseitige Verschweißung wegen der geringen Wandstärke nicht möglich ist. Es ist auch schon bekannt, bei der Verschweißung von Kunststoffrohren die Rohrenden übergreifende Verbindungsstücke vorzusehen, zwischen denen eine in sich geschlossene metallische Einlage angeordnet ist, in der zur Erzeugung der Schweißtemperatur ein Induktionsstoß von geeigneter Frequenz erzeugt wird. Die bekannte metallische Einlage ist hierbei als Ring ausgebildet. Da der Ring auf der Oberfläche des Rohres aufliegt, besteht zwischen Rohr und Verbindungsteil ein nach außen offener beiderseitiger, der Wandstärke des Ringes entsprechender Luftspalt, der durch den verflüssigten Kunststoff beim Schweißvorgang überbrückt werden muß, wobei die Luft zu einem Abbau des Kunststoffes, insbesondere der Polyamide, führt und sich somit nachteilig auswirkt. Ein weiterer Nachteil besteht darin, daß sich an den Kanten des Ringes nur schmale Schweißzonen bilden können, so daß die derart'verbundenen Rohre''nur über eine bestimmte Zugfestigkeit verfügen und auch bei hohen Drücken im Rohrinneren keine ausreichend sichere Dichtwirkung aufweisen. Wenn die bekannten Ring;e mit Durchbrechungen versehen werden, ergibt sich wohl eine gewisse Erhöhung der Zugfestigkeit, jedoch wird die Dichtwirkung bei hohen Drücken praktisch nicht vergrößert, da nur die schmalen Schweißzonen an den Ringkante in sich geschlossene Schweißzonen bilden können. It is also already known to use electroinductive pipes to be connected to one another Ways to weld; Here the frontal welding was initially suggested, in which a metal ring or metal wire is used, which is attached to the face of the Pipe rests and made of a matched to the plastic to be welded Metal alloy. The metal insert is heated by an induction coil and melted. After the melting temperature of the metal and the plastic has been reached the pipe ends are pressed against each other, so that the molten metal is pushed out and the melted end faces are firmly bonded together. This Method cannot be used for pipes with small diameters and high pressures, because the welding at the end is disadvantageous for the load-bearing capacity of the pipe Structural change occurs. The removal of the molten metal is also difficult, since any residues call the tightness into question. In no case can use this method on thin-walled pipes for obvious reasons frontal welding is not possible because of the small wall thickness. It is also already known that the ends of the pipes are used when welding plastic pipes Provide overlapping connecting pieces, between which a self-contained metallic insert is arranged in which to generate the welding temperature Induction shock of suitable frequency is generated. The well-known metallic insert is designed as a ring. Since the ring rests on the surface of the pipe, if there is a bilateral open to the outside between the pipe and the connecting part, the wall thickness of the ring corresponding to the air gap created by the liquefied Plastic must be bridged during the welding process, causing the air to break down of the plastic, in particular the polyamides, leads and thus has a disadvantageous effect. Another disadvantage is that the edges of the ring are only narrow Can form welding zones, so that the pipes connected in this way only over a certain Have tensile strength and even at high pressures inside the pipe it is not sufficient have a secure sealing effect. If the well-known ring; e provided with perforations there is probably a certain increase in tensile strength, but the Sealing effect practically not increased at high pressures, as only the narrow welding zones can form self-contained welding zones at the edge of the ring.

Der Erfindung liegt die Aufgabe zugrunde, diese Nachteile zu vermeiden und eine Verschweißung insbesondere dünnwandiger Rohre zu erreichen, die sowohl hinsichtlich der Zugfestigkeit als auch hinsichtlich der Dichtigkeit bei hohen Zugbeanspruchungen und hohen Innendrücken eine befriedigende feste und dichte Verbindung gewährleistet. Dies wird erfindungsgemäß dadurch erreicht, daß die metallische Einlage bündig mit der inneren Oberfläche des übergreifenden Verbindungsstückes in dessen Innenwand eingebettet wird und das Innenteil luftspaltlos in das übergreifende Teil eingeschoben wird und daß die Länge der Einlage ein Mehrfaches des Umfanges des zu verschweißenden Rohres beträgt. The invention is based on the object of avoiding these disadvantages and to achieve a welding in particular thin-walled pipes, which both in terms of tensile strength as well as in terms of tightness under high tensile loads and high internal pressures ensure a satisfactory, tight and tight connection. This is achieved according to the invention in that the metallic insert is flush with it the inner surface of the overarching Connector in whose inner wall is embedded and the inner part without air gaps in the overarching one Part is inserted and that the length of the insert is a multiple of the circumference of the pipe to be welded.

Durch die bündige Einbettung der Einlage in der Innenwandung des Verbindungsteiles wird ein Luftspalt zwischen Rohr und Verbindungsteil vermieden, so daß beim Schweißvorgang die durch Anwesenheit von Luft gegebenen Nachteile vermieden sind, da sich das Verbindungsteil luftspaltlos über das Rohr schieben läßt. Gleichzeitig entsteht eine doppelte geschlossene Verbindungszone, deren Länge ein Vielfaches des Rohrumfanges beträgt, was zu einer wesentlichen Erhöhung der Zugfestigkeit und auch der Dichtigkeit der Schweißverbindung führt, die allen auftretenden Beanspruchungen genügt. Due to the flush embedding of the insert in the inner wall of the Connecting part, an air gap between pipe and connecting part is avoided, so that the disadvantages caused by the presence of air are avoided during the welding process because the connecting part can be pushed over the pipe without any air gap. Simultaneously a double closed connection zone is created, the length of which is a multiple of the pipe circumference, which leads to a substantial increase in tensile strength and also the tightness of the welded joint leads to all stresses that occur enough.

Ein weiteres Merkmal besteht darin, daß die metallische Einlage unter Vorspannung in das Muffenmaterial eingebettet wird, sich in dem verflüssigten Kunststoffmaterial radial zusammenzieht und in der Rohroberfläche verankert. Bei Erwärmung tritt die Einlage zufolge ihrer Zusammenziehung zum Teil in die Rohroberfläche ein, wodurch eine optimale Verschweißung gewährleistet ist. Another feature is that the metallic insert under Bias is embedded in the sleeve material, in the liquefied plastic material contracts radially and anchored in the pipe surface. When heated, the Due to its contraction, the insert partially enters the pipe surface, whereby an optimal welding is guaranteed.

Weitere Merkmale ergeben sich aus den anderen Unteransprüchen. Further features emerge from the other subclaims.

Durch die erfindungsgemäße Anordnung und Ausbildung des als Einlage dienenden Drahtes wird eine ausreichende breite, durch die Windungsbreite des Drahtes bedingte Schweißzone geschaffen, die auch maximalen Anforderungen an Festigkeit und Dichtigkeit genügt. The inventive arrangement and design of the as an insert Serving wire is sufficiently wide, due to the winding width of the wire conditional welding zone created, which also maximum requirements for strength and tightness is sufficient.

Zur Erzielung einer einwandfreien Schweißverbindung und als Korrosionsschutz der nach innen freiliegenden Einlage ist es vorteilhaft, die Einlage mit einer beispielsweise im Wirbelsinterverfahren aufgebrachten Kunststoffumhüllung zu versehen, Die Zeichnungen zeigen verschiedene Ausführungsformen der zur Durchführung des Verfahrens verwendeten Metalleinlagen, und es bedeutet A b b. 1 Darstellung einer bekannten ringförmigen Metalleinlage im Schnitt, Abt. 2 Darstellung eines erfindungsgemäßen, in Windungen verlaufenden Metalldrahtes als Einlage, A b b. 3 Darstellung eines Drahtes gemäß Ab b. 2 mit abgewandelter Windungsform, A b b. 4 Darstellung eines Drahtes gemäß Abt. 2 in weiterer Abwandlung der Windungsform, Ab b. 5 Darstellung einer Schweißverbindung, bei der zwei Rohre mit einer die metallischen Einlagen enthaltenden Verbindungsmuffe verschweißt sind, A b b. 6 Darstellung eines T-förmigen Verbindungsstückes mit eingespritzten metallischen Einlagen, A b b. 7 Darstellung eines Verbindungsstückes mit einer aus mehreren nebeneinanderliegenden gewundenen Drähten bestehenden metallischen Einlage, A b b. 8 abgewandelte Darstellung gemäß A b b. 7, A b b. 9 eine einseitige Muffe für Stoßverbindungen und Reparaturzwecke mit einem Wellring als metallische Einlage, dessen Wellen senkrecht zur Achse stehen. To achieve a perfect welded connection and as protection against corrosion the inwardly exposed insert, it is advantageous to the insert with a, for example to provide plastic coating applied in the fluidized bed process, the drawings show various embodiments of the one used to carry out the method Metal inserts, and it means A b b. 1 illustration of a known ring-shaped Metal insert in section, Dept. 2 representation of an inventive, in turns running metal wire as an insert, A b b. 3 representation of a wire according to From b. 2 with a modified form of winding, A b b. 4 illustration of a wire according to Dept. 2 in a further modification of the winding shape, Ab b. 5 Representation of a welded connection, in the case of two pipes with a connecting sleeve containing the metallic inserts are welded, A b b. 6 Representation of a T-shaped connector with injected metallic inlays, A b b. 7 illustration of a connector with one from metallic inlay consisting of several coiled wires lying next to one another, A b b. 8 modified representation according to A b b. 7, A b b. 9 a one-sided sleeve for butt joints and repair purposes with a corrugated ring as a metallic insert, whose shafts are perpendicular to the axis.

Die A b b. 1 zeigt eine bekannte metallische, in sich geschlossene Einlage 1, die aus einem ringförmigen Körper besteht. Bei dieser Einlage 1 ergeben sich an den Ringkanten 2 und 3 in sich geschlossene Zonen, in denen die zu vereinigenden Körper miteinander verschweißt sind. Die Breite der Schweißzone ist ver- hältnismäßig gering; damit ist auch die Festigkeit und die Dichtigkeit der Schweiß verbindung begrenzt. Bei der erfindungsgemäßen Schweiß verbindung wird gemäß A b b. 2 ein gewundener Draht 4 verwendet. The A b b. 1 shows a known metallic, self-contained Insert 1, which consists of an annular body. With this deposit 1 result at the ring edges 2 and 3 self-contained zones in which the to be united Bodies are welded together. The width of the welding zone is proportional small amount; This also increases the strength and tightness of the weld limited. In the welding connection according to the invention, according to A b b. 2 a sinuous one Wire 4 used.

Die Verschweißungszone ist hierbei durch die gestrichelten Linien 5 dargestellt.The weld zone is shown here by the dashed lines 5 shown.

Bei der Ausführungsform gemäß A b b. 3 ist der Draht 6 in Windungen geführt, deren Schenkel einander parallel gerichtet sind und sich in einem solchen Abstand voneinander befinden, daß eine in sich geschlossene, durch die gestrichelten Linien gegebene Verschweißungszone 7 ergibt, deren Breite größer ist als die Länge der Windungen des Drahtes 6. Diese Verschweißungszone gewährleistet bei absoluter Dichtigkeit eine hohe Belastbarkeit in Zugrichtung. In the embodiment according to A b b. 3 is the wire 6 in turns out, whose legs are directed parallel to each other and in such a Distance from each other are that one self-contained, indicated by the dashed line Lines given welding zone 7 results, the width of which is greater than the length of the turns of the wire 6. This welding zone ensures with absolute Tightness a high load capacity in the direction of pull.

Bei einer abgewandelten Ausführungsform gemäß A b b. 4 ist der Draht 8 in Windungen geführt, die in ihrem Scheitelbereich 9 achsparallel verlaufen und in ihrem mittleren Bereich 10 schräggerichtet angeordnet sind, so daß sich eine Verschweißungszone besonders großer Breite ergibt, wie sie für hohe Zugbeanspruchungen notwendig ist.In a modified embodiment according to A b b. 4 is the wire 8 out in turns which run parallel to the axis in their apex area 9 and are arranged obliquely in its central region 10, so that a Welding zone results in a particularly large width, as it is for high tensile loads necessary is.

Die Querschnittsform des verwendeten Drahtes kann rund sein; er kann jedoch auch abgeflacht sein, um eine möglichst kleine radiale Erstreckung der Erweichungszone in dem Draht zu erreichen. The cross-sectional shape of the wire used can be round; he can however, it can also be flattened in order to minimize the radial extent of the softening zone in the wire to reach.

Das Verhältnis der Länge zur Breite kann z. B. The ratio of the length to the width can, for. B.

1 : 2 bis 1 : 3 sein, wobei die Breite selbstverständlich parallel zur Achsrichtung der Verbindung liegt.1: 2 to 1: 3, the width of course being parallel to the axial direction of the connection.

Der Vorteil des erfindungsgemäßen Verfahrens liegt darin, daß sich zufolge der Verwendung einer geschlossenen Metalleinlage auch eine geschlossene Verschweißungszone ereichen läßt, die eine absolute Dichtigkeit der Schweißverbindung gewährleistet, wobei durch entsprechende Formgebung und Verwendung eines in Windungen sich erstreckenden Drahtes oder eines geeigneten Lochblechstreifens auch die jeweils gewünschte Breite der Verschweißzone und damit die erforderliche Festigkeit erreicht werden kann. Hierbei ist die Temperatur in der in sich geschlossenen Metalleinlage während des Induktionsstromes überall gleich groß, so daß eine vollkommen gleichmäßige Verschweißung zwangläufig erhalten wird. The advantage of the method according to the invention is that due to the use of a closed metal insert also a closed one Can reach welding zone, which an absolute tightness of the welded joint guaranteed, whereby by appropriate shaping and use of one in turns extending wire or a suitable perforated sheet metal strip also each desired width of the weld zone and thus the required strength is achieved can be. Here is the temperature in the self-contained metal insert during the induction current the same size everywhere, so that a perfectly uniform Welding is inevitably obtained.

Die Abt. 5 zeigt eine nach dem erfindungsgemäßen Verfahren hergestellte Schweißverbindung, bei der die beiden dünnwandigen Kunststoffrohre 11 und 12 durch ein Verbindungsstück 13 miteinander verschweißt sind. In dem Verbindungsstück 13 sind die in sich geschlossenen, aus Draht bestehenden Metalleinlagen 14, 15 eingebettet; sie werden während des Spritzens des Verbindungsstückes 13 auf dem Spritzdorn, der in der Zeichnung nicht dargestellt ist, gehalten. Dieser Spritzdorn verläuft leicht konisch nach außen; es werden zwei Spritzdorne verwendet, von denen der eine die Einlage 14, der andere die Einlage 15 auf sich aufnimmt. Section 5 shows one produced by the method according to the invention Welded connection in which the two thin-walled plastic pipes 11 and 12 through a connecting piece 13 are welded together. In the connector 13 the self-contained metal inserts 14, 15 made of wire are embedded; they are during the spraying of the connector 13 on the spray mandrel, the is not shown in the drawing, held. This spray mandrel runs easily conical outwards; two spray mandrels are used, one of which is the Insert 14, the other the insert 15 takes up.

Zufolge der Konizität werden die Einlagen 14 und 15 auf dem nicht dargestellten, nach außen schwach konisch sich erweiternden Spritzdorn gehalten. Um bei Rohrverbindungen, bei denen auf Dichtigkeit besonderen Wert gelegt wird, eine Verschweißung auch an den Stirnflächen der beiden zu verbindenden Rohre 11 und 12 zu erreichen, ist in der Mitte des Verbindungsstückes 13 ein Ring 16 eingespritzt, an dem die Stirnflächen der Rohre 11 und 12 zur Anlage kommen. Bei Erzeugung eines Induktionsstromes gleichzeitig in den Einlagen 14, 15 und 16 erfolgt also eine gleichzeitige Verschweißung der Rohre 11 und 12 je mit dem Verbindungsstück 13 und eine Verschweißung der Stirnseiten der Rohre 11 und 12 durch die Einlage 16. As a result of the taper, the inserts 14 and 15 are not on the shown, held outwardly slightly conically widening spray mandrel. In order to be able to use pipe connections where tightness is of particular importance, a weld also at the end faces of the two pipes 11 to be connected and 12, a ring 16 is injected in the middle of the connector 13, on which the end faces of the tubes 11 and 12 come to rest. When creating a Induction current takes place simultaneously in the inserts 14, 15 and 16 one simultaneous welding of the tubes 11 and 12 each with the connecting piece 13 and a welding of the end faces of the tubes 11 and 12 through the insert 16.

Die A b b. 6 zeigt ein T-förmiges Verbindungsstück, in dem in der vorbeschriebenen Weise die Metalleinlagen 18, 19, 20 eingespritzt sind. Auch hier kann durch die Einlagen 16 eine zusätzliche Verschweißung der Rohrstirnflächen erfolgen. The A b b. 6 shows a T-shaped connector in which in FIG In the manner described above, the metal inserts 18, 19, 20 are injected. Here too the inserts 16 can be used for additional welding of the pipe end faces.

Die A b b. 7 und 8 zeigen Teile eines Verbindungsstückes 21, in dem in sich geschlossene Einlagen angeordnet sind. Bei der A b b. 7 bestehen diese Einlagen aus mehreren nebeneinanderliegenden, in sich geschlossenen, gewellten Drahtringen, z. B. 22, 23, 24, die, wie die A b b. 7 zeigt, ineinandergreifen. Bei der A b b. 8 sind zwei in sich geschlossene, gewellte Drahtringe 25 und 26 in das Verbindungsstück 21 so eingespritzt, daß sie sich einmal mit ihren Windungsscheiteln annähernd berühren und mit den angrenzenden Windungsscheiteln den größtmöglichen Abstand aufweisen, so daß bei der Verschweißung sowohl nach Abt. 7 als auch nach Abt. 8 eine geschlossene Schweißzone großer Breite entsteht. The A b b. 7 and 8 show parts of a connector 21 in which self-contained deposits are arranged. At the A b b. 7 these deposits exist from several adjacent, self-contained, corrugated wire rings, z. B. 22, 23, 24, which, like the A b b. 7 shows interlock. At the A b b. 8 are two self-contained, corrugated wire rings 25 and 26 in the connector 21 injected in such a way that they almost touch each other once with their apexes and have the greatest possible distance with the adjacent winding apices, so that during the welding both after Dept. 7 and after Dept. 8 a closed Large-width welding zone is created.

Die Abb. 9 zeigt eine einseitige Muffe 27, wie sie für Stoßverbindungen und Reparaturzwecke erforderlich ist. In die Muffe ist die Einlage 28 zur Verbindung mit dem Rohr und auf der Stirnfläche der Muffe die Einlage 29 zur Verbindung mit einer Gegenmuffe eingespritzt. Die stirnseitige Einlage 29 kann aus einem Wellring, dessen Wellen senkrecht zur Achse der Muffe angeordnet sind (linke Darstellung der A b b. 9), oder aus einem scheibenförmigen Ring (rechte Darstellung der Ab b. 9) bestehen. Fig. 9 shows a one-sided sleeve 27, as used for butt joints and repair purposes is required. In the sleeve is the insert 28 for connection with the pipe and on the face of the sleeve, the insert 29 for connection with injected into a mating sleeve. The frontal insert 29 can consist of a corrugated ring, whose shafts are arranged perpendicular to the axis of the socket (left illustration of the A b b. 9), or from a disc-shaped ring (right illustration of Fig. 9) exist.

Claims (8)

Patentansprüche: 1. Verfahren zum Verschweißen von Kunststoffrohren mit die Rohrenden übergreifenden Verbindungsstücken und einer in sich geschlossenen metallischen Einlage, in der zur Erzeugung der Schweißtemperatur ein Induktionsstrom von geeigneter Schwingungsfrequenz erzeugt wird, dadurch gekennzeichnet, daß die metallische Einlage bündig mit der inneren Oberfläche des übergreifenden Verbindungsstückes in dessen Innenwand eingebettet wird und das Innenteil luftspaltlos in das übergreifende Teil eingeschoben wird und daß die Länge der Einlage ein Mehrfaches des Umfanges des zu verschweißenden Rohres beträgt. Claims: 1. Method for welding plastic pipes with the pipe ends overlapping connectors and a self-contained metallic insert in which an induction current is used to generate the welding temperature is generated by a suitable vibration frequency, characterized in that the metallic insert flush with the inner surface of the overlapping connector is embedded in the inner wall and the inner part without air gaps in the overarching one Part is inserted and that the length of the insert is a multiple of the circumference of the pipe to be welded. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die metallische Einlage unter Vorspannung in das Muffenmaterial eingebettet wird, sich in dem verflüssigten Kunststoffmaterial radial zusammenzieht und in der Rohroberfläche verankert. 2. The method according to claim 1, characterized in that the metallic Insert is embedded under prestress in the sleeve material, in the liquefied Plastic material contracts radially and anchored in the pipe surface. 3. Schweißverbindung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die metallische Einlage aus einem Draht von ovalem Querschnitt besteht, um beim Spritzen des übergreifenden Verbindungsstückes den Fließwiderstand des Kunststoffes herabzusetzen und Lufteinschlüsse zu vermeiden. 3. Welded connection according to claim 1 or 2, characterized in that that the metallic insert consists of a wire of oval cross-section to at Injection molding of the overlapping connector reduces the flow resistance of the plastic reduce and avoid air inclusions. 4. Schweißverbindung nach Anspruch 3, dadurch gekennzeichnet, daß der Draht wellenlinienförmig gebogen ist. 4. Welded connection according to claim 3, characterized in that the wire is bent in a wavy line. 5. Schweißverbindung nach Anspruch 4, dadurch gekennzeichnet, daß der gebogene Draht schräggerichtete Schenkel aufweist. 5. Welded connection according to claim 4, characterized in that the bent wire has obliquely directed legs. 6. Schweißverbindung nach Anspruch 4, dadurch gekennzeichnet, daß der gebogene Draht achsparallele Schenkel besitzt. 6. Welded connection according to claim 4, characterized in that the bent wire has axially parallel legs. 7. Schweißverbindung nach Anspruch 4, dadurch gekennzeichnet, daß die Schenkel des gebogenen Drahtes im Bereich ihrer Biegungsscheitel achsparallel und in der Mitte zwischen den Biegungsscheiteln schräg zur Rohrachse verlaufen. 7. Welded connection according to claim 4, characterized in that the legs of the bent wire parallel to the axis in the area of their bend apex and run obliquely to the pipe axis in the middle between the bend vertices. 8. Schweißverbindung nach Anspruch 3, dadurch gekennzeichnet, daß mehrere der gebogenen Drähte so angeordnet sind, daß die einen Windungsscheitel wie ein Geflecht ineinandergreifen und die angrenzenden Windungsscheitel den größtmöglichen Abstand aufweisen. 8. Welded connection according to claim 3, characterized in that a plurality of the bent wires are arranged so that the one turn apex like a mesh intertwine and the adjacent turn vertices the largest possible Have distance.
DED44930A 1964-07-14 1964-07-14 Process for welding plastic pipes and welded joint formed according to the process Pending DE1291109B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DED44930A DE1291109B (en) 1964-07-14 1964-07-14 Process for welding plastic pipes and welded joint formed according to the process
FR37014A FR1473009A (en) 1964-07-14 1965-11-03 Process for welding plastic pipes preferably of small diameter and joint produced according to this process

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Application Number Priority Date Filing Date Title
DED44930A DE1291109B (en) 1964-07-14 1964-07-14 Process for welding plastic pipes and welded joint formed according to the process
FR37014A FR1473009A (en) 1964-07-14 1965-11-03 Process for welding plastic pipes preferably of small diameter and joint produced according to this process

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307162A1 (en) * 1982-03-01 1983-09-08 R & G Sloane Manufacturing Co. Inc., Sun Valley, Calif. PLASTIC PIPE CONNECTION
EP0190810A1 (en) * 1985-02-08 1986-08-13 Dürotan Rör A/S A method of joining plastic pipe ends and a connector sleeve for use therewith
DE3713884A1 (en) * 1987-04-25 1988-11-03 Dornier System Gmbh CONNECTING A METAL SLEEVE TO A PLASTIC SLEEVE IN ITS HOLE
DE3929326A1 (en) * 1989-09-04 1991-03-07 Wirsbo Pex Gmbh PIPE CONNECTION
FR2742691A1 (en) * 1995-12-22 1997-06-27 Etex De Rech Tech Soc Joining element
FR2748415A1 (en) * 1996-05-09 1997-11-14 Etex De Rech Tech Soc Joint part for joining thermoplastic pieces
DE29722603U1 (en) * 1997-12-20 1998-02-26 Manibs Spezialarmaturen Clamp made of thermally weldable material for line pipes
EP1079167A1 (en) * 1999-08-27 2001-02-28 Uponor Innovation Ab Electrofusion fitting
EP2172328A1 (en) * 2008-10-02 2010-04-07 Leister Process Technologies Induction connection sleeve for welding together weldable thermoplastic bodies
WO2010057599A1 (en) * 2008-11-21 2010-05-27 Newfrey Llc Hybrid joining component and production method thereof
EP3254832A1 (en) * 2016-06-10 2017-12-13 Girpi Connection element, connection with such an element and method for manufacturing a connection element
CN109774161A (en) * 2014-06-23 2019-05-21 靳宏杰 Mould plastic tube and plastic three-way welding process in aluminium composite heating radiator aluminium alloy pipeline
DE102019124251A1 (en) * 2019-09-10 2021-03-11 Progress-Werk Oberkirch Ag Method for producing a metal-plastic hybrid component and a metal-plastic hybrid component

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EP0294008A3 (en) * 1984-03-14 1991-04-03 Wavin B.V. An induction weldable socket and a process and apparatus for manufacturing such a socket and a process for connecting said socket to a penetrating pipe part
DE3604972C2 (en) * 1986-02-17 1997-06-19 Kabelmetal Electro Gmbh Socket connection for thermally insulated conduits
US5352871A (en) * 1991-02-20 1994-10-04 Metcal Inc System and method for joining plastic materials
GB2340904B (en) 1998-08-21 2003-05-21 Uponor Bv Method of joining plastics pipes and heat fusion fittings therefor
FR2901173B1 (en) 2006-05-17 2009-02-13 Gaz De France Sa DEVICE AND METHOD FOR WELDING TWO MELT POLYMER PARTS

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DE802282C (en) * 1948-10-02 1951-02-08 Siemens & Halske Akt Ges Process for welding plastic parts together
FR1260490A (en) * 1960-06-23 1961-05-05 Brown Boveri & Compagnie Sa Device for assembling non-metallic parts or parts thereof, preferably of thermoplastic materials
FR1261896A (en) * 1960-01-07 1961-05-26 Specialites P P Z Welding process for low loss angle plastics, such as polystyrene

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE802282C (en) * 1948-10-02 1951-02-08 Siemens & Halske Akt Ges Process for welding plastic parts together
FR1261896A (en) * 1960-01-07 1961-05-26 Specialites P P Z Welding process for low loss angle plastics, such as polystyrene
FR1260490A (en) * 1960-06-23 1961-05-05 Brown Boveri & Compagnie Sa Device for assembling non-metallic parts or parts thereof, preferably of thermoplastic materials

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307162A1 (en) * 1982-03-01 1983-09-08 R & G Sloane Manufacturing Co. Inc., Sun Valley, Calif. PLASTIC PIPE CONNECTION
EP0190810A1 (en) * 1985-02-08 1986-08-13 Dürotan Rör A/S A method of joining plastic pipe ends and a connector sleeve for use therewith
DE3713884A1 (en) * 1987-04-25 1988-11-03 Dornier System Gmbh CONNECTING A METAL SLEEVE TO A PLASTIC SLEEVE IN ITS HOLE
DE3929326A1 (en) * 1989-09-04 1991-03-07 Wirsbo Pex Gmbh PIPE CONNECTION
DE3929326C2 (en) * 1989-09-04 1999-03-25 Wirsbo Pex Gmbh Pipe connection
FR2742691A1 (en) * 1995-12-22 1997-06-27 Etex De Rech Tech Soc Joining element
FR2748415A1 (en) * 1996-05-09 1997-11-14 Etex De Rech Tech Soc Joint part for joining thermoplastic pieces
DE29722603U1 (en) * 1997-12-20 1998-02-26 Manibs Spezialarmaturen Clamp made of thermally weldable material for line pipes
EP1079167A1 (en) * 1999-08-27 2001-02-28 Uponor Innovation Ab Electrofusion fitting
EP2172328A1 (en) * 2008-10-02 2010-04-07 Leister Process Technologies Induction connection sleeve for welding together weldable thermoplastic bodies
US8327900B2 (en) 2008-10-02 2012-12-11 Leister Technologies Ag Induction connecting sleeve for connecting weldable thermoplastic elements by means of fusion
WO2010057599A1 (en) * 2008-11-21 2010-05-27 Newfrey Llc Hybrid joining component and production method thereof
US8556532B2 (en) 2008-11-21 2013-10-15 Newfrey Llc Joining component
CN109774161A (en) * 2014-06-23 2019-05-21 靳宏杰 Mould plastic tube and plastic three-way welding process in aluminium composite heating radiator aluminium alloy pipeline
EP3254832A1 (en) * 2016-06-10 2017-12-13 Girpi Connection element, connection with such an element and method for manufacturing a connection element
FR3052531A1 (en) * 2016-06-10 2017-12-15 Girpi CONNECTING ELEMENT, CONNECTING WITH SUCH A ELEMENT AND METHOD OF MANUFACTURING A CONNECTING ELEMENT
DE102019124251A1 (en) * 2019-09-10 2021-03-11 Progress-Werk Oberkirch Ag Method for producing a metal-plastic hybrid component and a metal-plastic hybrid component

Also Published As

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