EP0470170A1 - Sleeve-shaped weld connecting piece of thermoplastic material with weld indicator element, and welded joint formed therewith - Google Patents

Sleeve-shaped weld connecting piece of thermoplastic material with weld indicator element, and welded joint formed therewith

Info

Publication number
EP0470170A1
EP0470170A1 EP90907516A EP90907516A EP0470170A1 EP 0470170 A1 EP0470170 A1 EP 0470170A1 EP 90907516 A EP90907516 A EP 90907516A EP 90907516 A EP90907516 A EP 90907516A EP 0470170 A1 EP0470170 A1 EP 0470170A1
Authority
EP
European Patent Office
Prior art keywords
weld
connecting piece
sleeve
indicator element
shaped
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.)
Withdrawn
Application number
EP90907516A
Other languages
German (de)
French (fr)
Inventor
Berend Jan Van Dijk
Jan Anne Van Houten
Bernhard Lodder
Henk Jan Regeling
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.)
Wavin BV
Original Assignee
Wavin BV
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
Priority claimed from NL8901086A external-priority patent/NL8901086A/en
Priority claimed from NL8902561A external-priority patent/NL8902561A/en
Application filed by Wavin BV filed Critical Wavin BV
Publication of EP0470170A1 publication Critical patent/EP0470170A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • 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
    • B29C65/34—Joining 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"
    • B29C65/3404—Joining 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" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining 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" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • 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
    • B29C66/11—Joint 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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/50—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
    • B29C66/5229—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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91218—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods using colour change, e.g. using separate colour indicators
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91221—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the parts to be joined
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/976—Checking completion of joining or correct joining by using indications on at least one of the joined parts by the use of an indicator pin, e.g. being integral with one of the parts to be joined
    • 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
    • F16L47/03—Welded joints with an electrical resistance incorporated in the joint
    • 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
    • B29C65/34—Joining 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"
    • B29C65/3472—Joining 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" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining 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" characterised by the composition of the heated elements which remain in the joint being metallic
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/972—Checking completion of joining or correct joining by using indications on at least one of the joined parts by extrusion of molten material

Definitions

  • the invention relates to a sleeve-shaped weld connecting piece of thermoplastic material for connecting thermoplastic pipes comprising a heating element embedded near the inside wall, and also a pin- shaped weld indicator element which is disposed in a bore in the wall and retained therein.
  • the weld indicator element comprises a pin which is retained in a bore and has a flange-shaped element at its bottom side.
  • This known sleeve-shaped weld connecting piece has the disadvantage that only an extremely small difference in size between the internal dimensions of the weld connecting piece and the external dimensions of the pipe is permitted, since with greater play between weld connecting piece and pipe the gap between the two parts is not always closed by shrinkage of the weld connecting piece, and one cannot therefore be sure of the required pressure build-up for moving the pin, while welding still takes place.
  • this known weld indicator element therefore often does not meet the requirements set.
  • this known colour changeable indicator element presents the disadvantage that due to the rather great wall thickness of the connecting piece a long time is required before the small temperature increase generated during welding reaches the colour changeable indicator element.
  • the object of the invention is now to provide a weld connecting piece of the type mentioned at the beginning with which, even where there is greater play between weld connecting piece and pipe to be connected thereto, or where there is a great wall thickness between the actual welding site and the outer side of the connecting piece a faultless indication is given by the weld indicator element when the weld is produced.
  • the weld indicator element is provided with additional means enhancing the visibility of the welding action at the outer side of the connecting piece and said additional means being activatable by heat generated during welding.
  • the weld indicator element is provided with additional means in the form of pressure means which subject the weld indicator element to an outward-directed pressure at least during welding together of the weld connecting piece and the pipe part, so that the weld indicator element is thereby pressed out.
  • the pressure means particularly advantageously subject the weld indicator element constantly to an outward-directed pressure force. With the presence of such pressure means the weld indicator element is subjected constantly to an outward-directed pressure force, so that immediately after softening of the bottom part of the bore the weld indicator element is no longer retained and is pressed out by the pressure means.
  • the pressure means prefferably contains a spring means placed in a bore part, said spring means interacting with a projecting part of the weld indicator element, in particular a flange provided on the top side of the weld indicator element.
  • the weld connecting piece is constantly subjected to an outward-directed pressure force, but through the retention of the weld indicator element in the bore, it cannot move outwards.
  • the weld indicator element is no longer retained, due to the softening of the plastic mass, the element will be pressed out immediately in order to indicate that a welding operation has taken place.
  • the pressure means expediently comprise a coil spring which is integral with the weld indicator element and is connected to the top side of the weld indicator element.
  • the coil spring can be made of the same material as the weld indicator element, for example plastic, since the coil spring lies a great distance away from the heated part of the weld connecting piece.
  • the pressure means can expediently comprise a leaf spring, in which case one can use a pin carrying at its top side a curved plate which is pressed flat when the pin is placed in the bore and is held like this by the pin until during welding the retaining means for the pin can no longer make up for the tension in the deformed plate.
  • This design has the advantage that the weld indicator element can be formed in one operation.
  • the weld indicator element expediently has a container which is open at the top side and contains an expandable solid medium.
  • the expandable medium is a foa able medium, more particularly a foamable plastic compound.
  • the container for the expandable medium is expediently a metal container.
  • the pin-shaped weld indicator element is advantageously made of a plastic, more particularly of polyoxymethylene.
  • weld indicator element With the use of such a material for the weld indicator element, it can immediately be made integral with a leaf spring or with a coil spring.
  • the weld indicator element is a well heat conducting element extending to the vicinity of the heating element and engages a colour changeable element changing its colour at elevated temperature.
  • this temperature in the welding zone is substantially higher than the temperature as reached during storage and/or transport, it is possible to use a colour which will not change at temperatures occurring during transport and/or storage.
  • the well heat conducting metal element is broadened at its upper and/or lower side so that the colour changeable element is subjected to the temperature in the welding zone as strong as possible.
  • the weld indicator element comprises a metal pin engaging a colour changeable element at its upper side. In this manner an optimal quantity of heat is supplied to the colour changeable element.
  • the sleeve-shaped weld connecting piece of thermoplastic material is advantageously a polyolefin, for example polyethylene or polypropylene, while the thermoplastic pipes to be welded thereto are also made of a polyolefin.
  • the sleeve-shaped weld connecting piece is in particular suitable for the production of pipelines for carrying gas, but the invention is not limited to this.
  • the invention also relates to a welded joint of a sleeve-shaped weld connecting piece with at least one pipe accommodated therein and connected thereto by welding, which is characterized in that a sleeve- shaped weld connecting piece according to the invention is used.
  • Fig. 1 shows a longitudinal section of a first embodiment of a sleeve-shaped weld connecting piece according to the invention
  • Fig. la shows a cross-section of a variant of a weld connecting piece according to Fig. 1;
  • Fig. lb shows the same cross-section as that in Fig. la, but after the welded joint has been produced;
  • Fig. 2 shows a view of a variant of a sleeve-shaped weld connecting piece according to the invention
  • Fig. 2a shows the same view as that of Fig. 2 after the welded joint has been produced
  • Fig. 3 shows a longitudinal section of yet another embodiment of a sleeve-shaped weld connecting piece according to the invention
  • Fig. 3a shows the same cross-section as that in Fig. 3, but after the welded joint has been provided;
  • Fig. 4 shows a part of another sleeve-shaped weld connecting piece according to the invention with a foamable medium in a container;
  • Fig. 4a shows the same longitudinal section as that in Fig. 4 after a welded joint has been formed.
  • Fig. 5 shows a longitudinal section of still another weld connecting piece of the invention with a colour change element and Fig. 6 a detail of a variant of a weld connecting piece according to Fig. 5.
  • Fig. 1 shows a longitudinal section of a polypropylene welding sleeve 1 for connecting polypropylene pipes 2 by means of a welded joint. Embedded near the inside wall 3 of the welding sleeve
  • a metal heating element 4 which at its ends bears connecting parts 9, 9a accommodated in connecting chambers 10 and 10a.
  • the welding sleeve 1 also has two bores 5 in the wall 6 which extend with their bottom 8 to near the heating element 4.
  • the bottom 8 contains a recess 11 in which is clamped a narrowed part 22 of a weld indicator element in the form of a polyoxymethylene pin 7 which at its top side bears a flange 13 formed of polyoxymethylene material.
  • the flange 13 is accommodated in a circular bore part 5' in the outside wall of the welding sleeve.
  • the bore 5 has near its top side a circular boundary edge 17, while the pin can bear near its bottom side a circular collar 18' which has greater dimensions than the edge 17.
  • the opening formed by the circular edge 17 is greater than the dimension of the pin 7, so that the latter can pass the edge 17 during the outward movement.
  • the latter in order to ensure a particularly good fixing of the pin 7 in the bore 5, can also bear near its bottom 8 a circular recess 12 into which a projecting rib 16 of the pin 7 snaps.
  • the plastic begins to melt in the region of the circular recess 11, with the result that the pin 7 is no longer retained in the circular recess 12, and therefore through the compression being removed the spring 15 presses the pin 7 upwards.
  • Such a design has the great advantage that the weld indicator element is easy to manufacture, very reliable, and creep-resistant, while damage does not affect the reliability, and the weld indicator element does not depend on the welding pressure.
  • Fig. 2 shows another embodiment in which the weld indicator element again comprises a pin 7 of polyoxymethylene material retained in a bore 5.
  • This pin 7 is integral with a coiled strip 23, also made of polyoxymethylene material.
  • This coiled strip which is connected at a point 24a to an outer closed circular strip 24, forms a coil spring 18 which is retained in a bore 5.
  • the circle is fixed by a circular collar 26 in a widened part 25 of bore part 5'.
  • Fig. 2a it can be seen how the coil spring 18 has developed after the welded joint has been produced and the pin 7 is therefore pressed out.
  • the helical, line decreases upwards, so that the strip 23 can be deformed to the flat coil shown in Fig. 2.
  • the strip 23 is connected at 26 to the polyoxymethylene pin 7.
  • This weld indicator element is also simple to manufacture and easy to install, and damage does not have any influence on the reliability of the element.
  • Fixing coil spring 18 in bore part 5' in the outside wall of the welding sleeve means that the indicator can be prevented from being pressed fully out of the recess or bore 5.
  • Fig. 3 shows another embodiment, comprising a pin 7 having a leaf spring 19 integral therewith.
  • the leaf spring 19 in its original state has a curved shape. After positioning the pin 7 in the bore 5, the leaf spring 19 is, however, pressed flat, so that it adapts to the shape of the outside wall of the welding sleeve and is accommodated in bore part 5'.
  • Fig. 4 shows another embodiment, in which the weld indicator element comprises a metal box 21 filled with non-expanded polystyrene foam 20.
  • the temperature increases, causing heat to spread through the metal box 21 over the non-expanded polystyrene foam compound.
  • the polystyrene then expands, so that the material will move out of the box and forms indicator element 7'.
  • the container or the metal box 21 is anchored in the wall of the weld connecting piece in order to prevent plastic flowing through this bore 5 during welding from running out.
  • Such a weld indicator element has the great advantage of small dimensions.
  • weld indicator element made from two boxes which are bonded together, for example by polyethylene, and which contain a compression spring. Through the heat of a weld, the adhesive join is then broken, and one of the boxes is pressed out.
  • FIG. 5 shows another embodiment of the invention.
  • the bores 5 contain a metal pin 7 supporting at its upper side a sticker 27 of colour changeable material, which changes its colour at elevated temperatures, such as temperatures near the welding temperature generated by heating element 4.
  • the pin 7 may be provided with a broadened foot 9a.
  • the bore 8 is provided with an enlarged chamber 11 near the welding sleeve outer wall. The chamber 11 accommodates a head 12 of pin 9 bearing an enlarged sticker 10' of colour changeable material (vide fig. 6) .

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

Abstract

Est décrite une pièce de raccordement soudé en forme de manchon (1) et en matériau thermoplastique pour raccorder des tuyaux thermoplastiques (2) au moyen d'un assemblage soudé. La pièce de raccordement comprend un élément de chauffage (4) noyé à proximité de la paroi intérieure (3) et supportant des parties de raccordement (9, 9a) logées dans des chambres (10, 10a). Un indicateur de soudage en forme d'axe (7, 7') s'étendant jusqu'à la région de l'élément chauffant (4) est disposé dans un alésage (5) ménagé dans la paroi (6) de ladite pièce de raccordement. Cet indicateur est pourvu de moyens supplémentaires (15, 18, 19, 20, 21, 27 et 27') améliorant la visibilité d'une action de soudage, par l'intermédiaire de l'élément chauffant (4), au niveau de la face extérieure de la pièce de raccordement, lesdits moyens supplémentaires étant activés par la chaleur produite durant le soudage. L'élément en forme d'axe (7) peut être constitué d'un axe métallique (7) s'étendant du voisinage de l'élément chauffant (4) au voisinage de la paroi extérieure de la pièce de raccordement, ledit élément en forme d'axe (7) portant au niveau de sa face supérieure une étiquette adhésive (27, 27') réalisée dans un matériau qui change de couleur sous l'effet de la chaleur produite pendant le soudage.A connection piece welded in the form of a sleeve (1) and made of thermoplastic material is described for connecting thermoplastic pipes (2) by means of a welded assembly. The connection piece comprises a heating element (4) embedded near the interior wall (3) and supporting connection parts (9, 9a) housed in chambers (10, 10a). An axis-shaped welding indicator (7, 7 ') extending to the region of the heating element (4) is arranged in a bore (5) formed in the wall (6) of said piece of connection. This indicator is provided with additional means (15, 18, 19, 20, 21, 27 and 27 ') improving the visibility of a welding action, via the heating element (4), at the level of the outer face of the connecting piece, said additional means being activated by the heat produced during welding. The axis-shaped element (7) may consist of a metal axis (7) extending from the vicinity of the heating element (4) to the vicinity of the outer wall of the connecting piece, said element in form of axis (7) carrying at its upper face an adhesive label (27, 27 ') made of a material which changes color under the effect of the heat produced during welding.

Description

Sleeve-shaped weld connecting piece of thermoplastic material with weld indicator element, and welded joint formed therewith.
The invention relates to a sleeve-shaped weld connecting piece of thermoplastic material for connecting thermoplastic pipes comprising a heating element embedded near the inside wall, and also a pin- shaped weld indicator element which is disposed in a bore in the wall and retained therein.
Such a sleeve-shaped weld connecting piece provided with a pin-shaped weld indicator element by means of which it can be seen from the outside whether a welding operation has actually produced a weld is known.
In this known sleeve-shaped weld connecting piece the weld indicator element comprises a pin which is retained in a bore and has a flange-shaped element at its bottom side. During the production of the weld plastic softens around the bottom of the bore, so that as a result of shrinkage of the sleeve and thermal expansion of the material in the welding zone plastic is pressed into the bore and the flange with pin is moved upwards.
This known sleeve-shaped weld connecting piece has the disadvantage that only an extremely small difference in size between the internal dimensions of the weld connecting piece and the external dimensions of the pipe is permitted, since with greater play between weld connecting piece and pipe the gap between the two parts is not always closed by shrinkage of the weld connecting piece, and one cannot therefore be sure of the required pressure build-up for moving the pin, while welding still takes place. In the case of weld connecting pieces with wide tolerances required in practice, this known weld indicator element therefore often does not meet the requirements set. On the other hand it is known to provide the outer wall of a weld connecting piece with a colour changeable indicator element in the form of a sticker showing a colour change at a certain temperature and the resulting colour remains after cooling. However, this known colour changeable indicator element presents the disadvantage that due to the rather great wall thickness of the connecting piece a long time is required before the small temperature increase generated during welding reaches the colour changeable indicator element.
Furthermore due to the low heat conductibility of the wall of the connecting piece it is necessary to use a colour changeable element showing a colour change at rather low temperature. Often this low temperature is reached during storage and transport of the connecting piece so that the colour of the colour changeable element already changes before its use and becomes unusable.
The object of the invention is now to provide a weld connecting piece of the type mentioned at the beginning with which, even where there is greater play between weld connecting piece and pipe to be connected thereto, or where there is a great wall thickness between the actual welding site and the outer side of the connecting piece a faultless indication is given by the weld indicator element when the weld is produced.
This object is achieved according to the invention in that the weld indicator element is provided with additional means enhancing the visibility of the welding action at the outer side of the connecting piece and said additional means being activatable by heat generated during welding. Very preferably the weld indicator element is provided with additional means in the form of pressure means which subject the weld indicator element to an outward-directed pressure at least during welding together of the weld connecting piece and the pipe part, so that the weld indicator element is thereby pressed out.
It will be clear that, as a result of the presence of the above-mentioned pressure means, the movement of the weld indicator element is no longer dependent on a build-up of pressure in the welding zone, but is purely dependent on the heat supply which occurs during the formation of the weld and, for example, softens the part of the weld connecting piece which ensures that the weld indicator element is retained, so that the weld indicator element is no longer retained and the pressure means can press the weld indicator element out.
The pressure means particularly advantageously subject the weld indicator element constantly to an outward-directed pressure force. With the presence of such pressure means the weld indicator element is subjected constantly to an outward-directed pressure force, so that immediately after softening of the bottom part of the bore the weld indicator element is no longer retained and is pressed out by the pressure means.
It is particularly advantageous for the pressure means to contain a spring means placed in a bore part, said spring means interacting with a projecting part of the weld indicator element, in particular a flange provided on the top side of the weld indicator element. Through the presence of the preferably metal compression spring, the weld connecting piece is constantly subjected to an outward-directed pressure force, but through the retention of the weld indicator element in the bore, it cannot move outwards. However, as soon as the weld indicator element is no longer retained, due to the softening of the plastic mass, the element will be pressed out immediately in order to indicate that a welding operation has taken place. According to another embodiment, the pressure means expediently comprise a coil spring which is integral with the weld indicator element and is connected to the top side of the weld indicator element. In this embodiment the coil spring can be made of the same material as the weld indicator element, for example plastic, since the coil spring lies a great distance away from the heated part of the weld connecting piece. The pressure means can expediently comprise a leaf spring, in which case one can use a pin carrying at its top side a curved plate which is pressed flat when the pin is placed in the bore and is held like this by the pin until during welding the retaining means for the pin can no longer make up for the tension in the deformed plate.
This design has the advantage that the weld indicator element can be formed in one operation.
According to an entirely different embodiment, the weld indicator element expediently has a container which is open at the top side and contains an expandable solid medium.
During carrying out of the welding operation heat is produced and swells up the expandable medium, and therefore a part of the compound in the container is pressed outwards as an indicator showing that the welding operation has taken place. It is particularly advantageous for the expandable medium to be a foa able medium, more particularly a foamable plastic compound. The container for the expandable medium is expediently a metal container.
The pin-shaped weld indicator element is advantageously made of a plastic, more particularly of polyoxymethylene.
With the use of such a material for the weld indicator element, it can immediately be made integral with a leaf spring or with a coil spring.
In another advantageous embodiment the weld indicator element is a well heat conducting element extending to the vicinity of the heating element and engages a colour changeable element changing its colour at elevated temperature.
By using a well heat conducting weld indicator the heat generated during welding is rapidly conveyed to the colour changeable element and reaches rapidly a temperature near the temperature in the welding zone.
As this temperature in the welding zone is substantially higher than the temperature as reached during storage and/or transport, it is possible to use a colour which will not change at temperatures occurring during transport and/or storage.
Appropriately the well heat conducting metal element is broadened at its upper and/or lower side so that the colour changeable element is subjected to the temperature in the welding zone as strong as possible. In a preferred embodiment the weld indicator element comprises a metal pin engaging a colour changeable element at its upper side. In this manner an optimal quantity of heat is supplied to the colour changeable element. The sleeve-shaped weld connecting piece of thermoplastic material is advantageously a polyolefin, for example polyethylene or polypropylene, while the thermoplastic pipes to be welded thereto are also made of a polyolefin.
The sleeve-shaped weld connecting piece is in particular suitable for the production of pipelines for carrying gas, but the invention is not limited to this.
The invention also relates to a welded joint of a sleeve-shaped weld connecting piece with at least one pipe accommodated therein and connected thereto by welding, which is characterized in that a sleeve- shaped weld connecting piece according to the invention is used.
The invention will now be illustrated with reference to embodiments of the invention shown in the drawing, in which:
Fig. 1 shows a longitudinal section of a first embodiment of a sleeve-shaped weld connecting piece according to the invention; Fig. la shows a cross-section of a variant of a weld connecting piece according to Fig. 1;
Fig. lb shows the same cross-section as that in Fig. la, but after the welded joint has been produced;
Fig. 2 shows a view of a variant of a sleeve-shaped weld connecting piece according to the invention;
Fig. 2a shows the same view as that of Fig. 2 after the welded joint has been produced;
Fig. 3 shows a longitudinal section of yet another embodiment of a sleeve-shaped weld connecting piece according to the invention;
Fig. 3a shows the same cross-section as that in Fig. 3, but after the welded joint has been provided;
Fig. 4 shows a part of another sleeve-shaped weld connecting piece according to the invention with a foamable medium in a container;
Fig. 4a shows the same longitudinal section as that in Fig. 4 after a welded joint has been formed.
Fig. 5 shows a longitudinal section of still another weld connecting piece of the invention with a colour change element and Fig. 6 a detail of a variant of a weld connecting piece according to Fig. 5.
Fig. 1 shows a longitudinal section of a polypropylene welding sleeve 1 for connecting polypropylene pipes 2 by means of a welded joint. Embedded near the inside wall 3 of the welding sleeve
1 is a metal heating element 4 which at its ends bears connecting parts 9, 9a accommodated in connecting chambers 10 and 10a.
The welding sleeve 1 also has two bores 5 in the wall 6 which extend with their bottom 8 to near the heating element 4. The bottom 8 contains a recess 11 in which is clamped a narrowed part 22 of a weld indicator element in the form of a polyoxymethylene pin 7 which at its top side bears a flange 13 formed of polyoxymethylene material. The flange 13 is accommodated in a circular bore part 5' in the outside wall of the welding sleeve.
A compressed spring 15, which is supported at one side by a bottom 14 of bore part 5' and at the other side interacts with the flange 13 of the pin 7, exerts a constant outward-directed pressure force on the pin 7 of the weld indicator element. Through the clamping of the narrowed part 22 of the polyoxymethylene pin 7 in the recess 11 of the polypropylene welding sleeve, the pin 7 cannot, however, move outwards. Such a clamping is ensured by the fact that the polyoxymethylene material of the pin 7 has a greater modulus of elasticity than the polypropylene of the welding sleeve. The bore 5 has near its top side a circular boundary edge 17, while the pin can bear near its bottom side a circular collar 18' which has greater dimensions than the edge 17. The opening formed by the circular edge 17 is greater than the dimension of the pin 7, so that the latter can pass the edge 17 during the outward movement.
Advantageously, in a variant such as that shown in Fig. la and Fig. lb, in order to ensure a particularly good fixing of the pin 7 in the bore 5, the latter can also bear near its bottom 8 a circular recess 12 into which a projecting rib 16 of the pin 7 snaps.
Once the welded connection has been produced, the plastic begins to melt in the region of the circular recess 11, with the result that the pin 7 is no longer retained in the circular recess 12, and therefore through the compression being removed the spring 15 presses the pin 7 upwards.
Through a circular boundary edge or projections 17, the outward movement of the pin 7 is now also limited, since the collar 18' hits the edge 17 and stops the outward movement of the pin. Any plastic which might flow, through a build-up of pressure, into the bore 5 after the outward movement of the pin 7 cannot flow out, since the edge 17 and collar 18 shut off the bore 5 at the top side. A suitable tension of the spring 15 lies at approximately 15 to 30 N.
Such a design has the great advantage that the weld indicator element is easy to manufacture, very reliable, and creep-resistant, while damage does not affect the reliability, and the weld indicator element does not depend on the welding pressure.
Fig. 2 shows another embodiment in which the weld indicator element again comprises a pin 7 of polyoxymethylene material retained in a bore 5. This pin 7 is integral with a coiled strip 23, also made of polyoxymethylene material. This coiled strip, which is connected at a point 24a to an outer closed circular strip 24, forms a coil spring 18 which is retained in a bore 5. The circle is fixed by a circular collar 26 in a widened part 25 of bore part 5'. In Fig. 2a it can be seen how the coil spring 18 has developed after the welded joint has been produced and the pin 7 is therefore pressed out. As can be seen, the helical, line decreases upwards, so that the strip 23 can be deformed to the flat coil shown in Fig. 2. The strip 23 is connected at 26 to the polyoxymethylene pin 7.
This weld indicator element is also simple to manufacture and easy to install, and damage does not have any influence on the reliability of the element. Fixing coil spring 18 in bore part 5' in the outside wall of the welding sleeve means that the indicator can be prevented from being pressed fully out of the recess or bore 5.
Fig. 3 shows another embodiment, comprising a pin 7 having a leaf spring 19 integral therewith. The leaf spring 19 in its original state has a curved shape. After positioning the pin 7 in the bore 5, the leaf spring 19 is, however, pressed flat, so that it adapts to the shape of the outside wall of the welding sleeve and is accommodated in bore part 5'.
After a weld has been produced, softening of the plastic near the bottom of the bore 5 allows the pin 7 to move upwards, as a result of which the leaf spring 19 assumes its original curved position. The bore 5 is here again provided with a boundary edge 17, so that the pin 7 cannot move all the way out, and therefore during welding any molten or fluid polyethylene cannot run out though the bore 5. This weld indicator element 7, 19 is also easy to manufacture and has the advantage that it is in one piece, while the reliability of the indicator is not affected by damage .
Finally, Fig. 4 shows another embodiment, in which the weld indicator element comprises a metal box 21 filled with non-expanded polystyrene foam 20. During welding the temperature increases, causing heat to spread through the metal box 21 over the non-expanded polystyrene foam compound. At a particular temperature the polystyrene then expands, so that the material will move out of the box and forms indicator element 7'.
The container or the metal box 21 is anchored in the wall of the weld connecting piece in order to prevent plastic flowing through this bore 5 during welding from running out. Such a weld indicator element has the great advantage of small dimensions.
Instead of the embodiments shown, it is also possible to choose a weld indicator element made from two boxes which are bonded together, for example by polyethylene, and which contain a compression spring. Through the heat of a weld, the adhesive join is then broken, and one of the boxes is pressed out.
Another possibility is to support the pin 7 by a liquid placed in a deformable container and expandable under the influence of welding heat, so that during welding the pin is pressed out through deformation of said container. Fig. 5 shows another embodiment of the invention. The bores 5 contain a metal pin 7 supporting at its upper side a sticker 27 of colour changeable material, which changes its colour at elevated temperatures, such as temperatures near the welding temperature generated by heating element 4. In order to obtain an excellent heat absorbing capacity the pin 7 may be provided with a broadened foot 9a. Advantageously the bore 8 is provided with an enlarged chamber 11 near the welding sleeve outer wall. The chamber 11 accommodates a head 12 of pin 9 bearing an enlarged sticker 10' of colour changeable material (vide fig. 6) .

Claims

C L I M S
1. Sleeve-shaped weld connecting piece (1) of thermoplastic material for connecting thermoplastic pipes (2) comprising a heating element (4) embedded near the inside wall (3) , and also a pin-shaped weld indicator element (7, 7*) which is disposed in a bore (5) in the wall (6) and retained therein, characterized in that the weld indicator element (7, 7') is provided with additional means (15; 18, 19, 20, 21; 27 and 27') enhancing the visibility of the welding action at the outer side of the connecting piece and said additional means being activatable by heat generated during welding.
2. Sleeve-shaped weld connecting piece according to Claim 1, characterized in that the weld indicator element (7) is provided with additional means in the form of pressure means (15; 18, 19, 20, 21) which subject the weld indicator element (7) to an outward- directed pressure at least during welding together of the weld connecting piece and the pipe part, so that the weld indicator element is thereby pressed out.
3. Sheeve-shaped weld connecting piece according to Claim 2, characterized in that the pressure means (15, 19) subject the weld indicator element (7) constantly to an outward-directed pressure force.
4. Sleeve-shaped weld connecting piece according to Claim 2 or 3, characterized in that the pressure means contain a spring means (15) placed in a bore part (5'), said spring means interacting with a projecting part of the weld indicator element (7) .
5. Sleeve-shaped weld connecting piece according to Claim 3, characterized in that the projecting part comprises a flange (13) provided on the top side of the weld indicator element.
6. Sleeve-shaped weld connecting piece according to Claim 2, characterized in that the pressure means comprise a coil spring (18) which is connected to the weld indicator element, which spring is connected to the top side of the weld indicator element (7) .
7. Sleeve-shaped weld connecting piece according to Claim 2 or 3, characterized in that the pressure means comprise a leaf spring (19) connected to the top side of the weld formation indicator element (7) .
8. Sleeve-shaped weld connecting piece according to Claim 1, characterized in that the additional means (20, 21) comprise a container (21) which is open at the top side and contains a medium which is expandable under the influence of heat.
9. Sleeve-shaped weld connecting piece according to Claim 8, characterized in that the expandable medium is foamable.
10. Sleeve-shaped weld connecting piece according to Claim 8 or 9, characterized in that the expandable medium is a foamable plastic composition.
11. Sleeve shaped weld connecting piece according to Claim 1, characterized in that, the weld indicator element (7) is a well heat conducting element extending to the vicinity of the heating element (4) and engages a colour changeable element (27, 27') changing its colour at elevated temperature.
12. Sleeve-shaped weld connecting piece according to Claim 10, characterized in that the well heat conducting element (7) is broadened at its upper and/or lower side.
13. Welded joint of a sleeve-shaped weld connecting piece with at least one pipe accommodated therein and connected thereto by welding, characterized in that a sleeve-shaped weld connecting piece according to one or more of the preceding claims is used.
EP90907516A 1989-04-28 1990-04-27 Sleeve-shaped weld connecting piece of thermoplastic material with weld indicator element, and welded joint formed therewith Withdrawn EP0470170A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL8901086A NL8901086A (en) 1989-04-28 1989-04-28 Weld indicating weld connecting sleeve for thermoplastic pipes - having thermally released spring element or colour changing element
NL8901086 1989-04-28
NL8902561A NL8902561A (en) 1989-10-16 1989-10-16 Weld indicating weld connecting sleeve for thermoplastic pipes - having thermally released spring element or colour changing element
NL8902561 1989-10-16

Publications (1)

Publication Number Publication Date
EP0470170A1 true EP0470170A1 (en) 1992-02-12

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Application Number Title Priority Date Filing Date
EP90907516A Withdrawn EP0470170A1 (en) 1989-04-28 1990-04-27 Sleeve-shaped weld connecting piece of thermoplastic material with weld indicator element, and welded joint formed therewith

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EP (1) EP0470170A1 (en)
AU (1) AU5569890A (en)
WO (1) WO1990013411A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2742691B1 (en) * 1995-12-22 1998-01-23 Etex De Rech Tech Soc THERMOPLASTIC CONNECTING ELEMENT FOR JOINING PARTS BY WELDING ACCORDING TO AN OPEN JUNCTION SURFACE
DE29619326U1 (en) 1996-01-04 1997-02-20 Geberit Technik Ag, Jona Welding socket
DE19746105C2 (en) * 1997-10-17 2001-04-19 Kunststoff Zentrum Leipzig Sweat indicator
DE50312989D1 (en) 2002-06-25 2010-09-30 Friatec Ag Welding fitting with a welding indicator
DE102008032884B4 (en) 2008-07-14 2018-09-20 Mahle International Gmbh Valve device, heat exchanger and charging system for charging an internal combustion engine with a charging fluid
CN109140102B (en) * 2018-08-29 2023-09-01 临海伟星新型建材有限公司 Electric smelting pipe fitting with welding quality indicating device

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1694871A (en) * 1927-07-23 1928-12-11 Ac Spark Plug Co Heat indicator for internal-combustion engines
US3053092A (en) * 1956-06-12 1962-09-11 Antioch College Thermal element
US3724360A (en) * 1971-02-25 1973-04-03 Dun Rite Mfg Corp Thermal indicator
US3834226A (en) * 1971-08-16 1974-09-10 Becton Dickinson Co Disposable temperature indicator
US3872822A (en) * 1973-08-20 1975-03-25 Becton Dickinson Co Disposable temperature indicator
US3965849A (en) * 1975-03-17 1976-06-29 Minnesota Mining And Manufacturing Company Coiled edge guide for rod-tube signal device and method
CH612489A5 (en) * 1977-01-21 1979-07-31 Geberit Ag Electrically heatable welding collar
CH632078A5 (en) * 1978-09-12 1982-09-15 Von Roll Ag Collar for connecting line elements
US4325254A (en) * 1980-01-29 1982-04-20 Staodynamics, Inc. Temperature indicative hotpack
DE3125393A1 (en) * 1981-06-27 1983-01-13 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Connection of at least two walls
AU581014B2 (en) * 1984-08-28 1989-02-09 Von Roll Ag Weldable connecting member for connecting or joining thermoplastic pipe elements
ZA873462B (en) * 1986-05-19 1988-11-14 Rastech, Inc. Hot bearing warning bolt
JP2513757B2 (en) * 1988-01-07 1996-07-03 日立金属株式会社 How to connect electric fusion type plastic pipes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9013411A1 *

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WO1990013411A1 (en) 1990-11-15

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