CH665387A5 - Welding together thermoplastic pipes - using resistance heater circuit with microprocessor controller which checks resistance of element and switches system - Google Patents

Welding together thermoplastic pipes - using resistance heater circuit with microprocessor controller which checks resistance of element and switches system Download PDF

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Publication number
CH665387A5
CH665387A5 CH299/85A CH29985A CH665387A5 CH 665387 A5 CH665387 A5 CH 665387A5 CH 299/85 A CH299/85 A CH 299/85A CH 29985 A CH29985 A CH 29985A CH 665387 A5 CH665387 A5 CH 665387A5
Authority
CH
Switzerland
Prior art keywords
resistance
welding together
welding
thermoplastic pipes
heater circuit
Prior art date
Application number
CH299/85A
Other languages
German (de)
Inventor
Robert Meier
Alfred Streng
Original Assignee
Streng Plastic Ag
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 Streng Plastic Ag filed Critical Streng Plastic Ag
Priority to CH299/85A priority Critical patent/CH665387A5/en
Publication of CH665387A5 publication Critical patent/CH665387A5/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/38—Impulse heating
    • 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
    • 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
    • B29C66/9131—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 heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—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 heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91317—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 heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring the electrical resistance
    • 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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the 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
    • 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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • 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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • 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
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux 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
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G05D23/2401—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor using a heating element as a sensing element
    • 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time

Landscapes

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

Abstract

In welding together thermoplastic pipes with an electric resistance heater element the heating current is supplied at intervals, between which the change in resistance of the element caused is ascertained in order to control the welding process. ADVANTAGE - The process eliminates the disadvantages of methods in which the temp. of the weld area is not watched for a certain time whilst heating current continues to be fed in.

Description

       

  
 



   BESCHREIBUNG



   Die vorliegende Erfindung betrifft ein Verfahren zum Schweissen von thermoplastischen Kunststoffrohrteilen mittels eines elektrischen Widerstandselementes.



   Die Anwendung der elektrischen Widerstandsheizung zum Verbinden von Kunststoffrohrteilen ist bekannt.



   Aus der CH-PS Nr. 529 628 ist ein Verfahren bekannt, bei dem der Heizstrom unter Verwendung eines elektrischen Energiedosiergerätes in zwei Etappen dem Widerstandselement zugeführt wird, wobei die erste Etappe lediglich der Gewährleistung eines guten Kontaktes zwischen den zu verschweissenden Kunststoffteilen dient und die zweite Etappe den eigentlichen Schweissvorgang darstellt. Die Heizenergie wird während der beiden Etappen über das Energiedosiergerät kontinuierlich zugeführt, wobei die Heizenergie während beiden Etappen gleich oder unterschiedlich sein kann.



   Der Nachteil dieses Verfahrens besteht darin, dass während eines bestimmten Zeitraumes eine bestimmte Heizenergie den zu verschweissenden Kunststoffteilen kontinuierlich zugeführt wird und eine Überwachung der Temperatur an der Schweissstelle nicht vorgesehen ist.



   Ziel der vorliegenden Erfindung ist es, ein Verfahren zum Schweissen von Kunststoffrohrteilen so zu verbessern, dass die erwähnten Nachteile nicht auftreten.



   Dieses Ziel wird erfindungsgemäss mit den im   kennzeich-    nenden Teil des Patentanspruches 1 genannten Merkmalen erreicht.



   Bei einer bevorzugten Ausführungsform des Verfahrens werden die Widerstandswerte laufend aufgezeichnet. Die hat den Vorteil, dass aufgrund dieser Aufzeichnung eine Aussage über die Güte der Schweissverbindung gemacht werden kann.



   Im folgenden wird die Erfindung anhand der beiliegenden Zeichnungen erläutert.



   Es zeigen:
Fig. 1 ein Blockschema einer Vorrichtung zur Durchführung des erfindungsgemässen Verfahrens,
Fig. 2 ein Programmlaufplan für das erfindungsgemässe Verfahren, und
Fig. 3 ein Programmlaufplan eines Unterprogrammes des erfindungsgemässen Verfahrens.



   Zur Durchführung des hier in Rede stehenden Verfahrens wird ein in Fig. 1 als Blockschema dargestelltes Ausführungsbeispiel einer Vorrichtung verwendet. Die Vorrichtung ist in einen Starkstromteil und einen Steuerstromteil unterteilt. Der Starkstromteil umfasst ein Netzgerät 1, um die Steuerspannungen für den Steuerteil zu erzeugen, ein erstes elektromagnetisches Schaltelement 2, um ein in den zu verschweissenden Rohrteilen (nicht dargestellt) vorgesehenes elektrisches Widerstandselement 3 mit Strom zu versorgen, und ein zweites elektromagnetisches Schaltelement 4, um den ohmschen Widerstand des Widerstandselementes 3 zu messen.



   Der Steuerteil enthält einen Mikroprozessor 5, der im wesentlichen die Steuerung der Vorrichtung übernimmt, einen Logikschaltkreis 6, der mit dem Mikroprozessor 5 verbunden ist und unter anderem die Schaltelemente 2, 4 ansteuert, einen Anpassschaltkreis 7, der mit dem Mikroprozessor 5 und dem zweiten Schaltelement 4 verbunden ist und die am Widerstandselement 3 gemessenen Widerstandswerte in eine für den Mikroprozessor 5 kompatible Form umwandelt, und einen Drucker 8, der mit dem Mikroprozessor 5 verbunden ist und die gemessenen Widerstandswerte laufend ausdruckt.



   Nachfolgend wird die Funktion der Vorrichtung anhand der Fig. 2 und 3 beschrieben.



   Mit der Betätigung eines  Start -Druckknopfes wird der Widerstandswert des angeschlossenen Widerstandselementes 3 gemessen, wobei die gemessenen   Q-Werte    durch den Anpassschaltkreis 7 in für den Mikroprozessor 5 kompatible Signale umgewandelt werden. Im Mikroprozessor 5 sind eine Mehrzahl von   #-Werten,    die verschiedenen   Ausführungsfor-    men von Widerstandselementen 3 entsprechen, in einer Tabelle gespeichert. Der gemessene   Q-Wert    wird mit den   Q-    Werten in der Tabelle verglichen. Fällt dieser Vergleich negativ aus, wird die an der Vorrichtung angezeigt und das Widerstandselement 3 wird gegen ein anderes ausgetauscht.



  Fällt der Vergleich positiv aus, schaltet die Vorrichtung auf  Vorwärmen .



   Wie Figur 3 zeigt, ist dieses Vorwärmen in einen Heizvorgang und einen Messvorgang unterteilt, die in gleichmässigen Intervallen durchgeführt werden, deren Dauer im Mikroprozessor eingestellt werden kann. Nach Ablauf des Heizvorganges während dem durch das Widerstandselement 3 ein elektrischer Strom fliesst, wird auf den Messvorgang umgeschaltet, während dem der Istwert des   Widerstandswer-    tes des Widerstandselementes 3 gemessen wird. Dieser Istwert wird einerseits von einem Drucker 8 ausgedruckt und andererseits mit einer Vorwärmtemperatur   100       C)    verglichen. Diese Vorgänge werden solange wiederholt, bis die Vorwärmtemperatur erreicht wird.



   Wird die Vorwärmtemperatur erreicht, schaltet die Vorrichtung nach Ablauf einiger Sekunden, die eine Pause darstellen auf  Schweissen . Dieses  Schweissen  läuft nach dem gleichen Muster wie das  Vorwärmen  ab, bis die   Schweisstemperatur 1 180  C) erreicht wird. Beim  Vorwär-    men  und  Schweissen  wird der sich ändernde Widerstandswert als Algorithmus verwendet, um das Rechnerprogramm zu steuern. Der vom Drucker ausgedruckte Temperaturverlauf kann als Graphik oder als alphanumerischer Ausdruck dargestellt werden. Dieser Ausdruck kann als Protokoll für die Güte der Schweissverbindung verwendet werden.



   Nachzutragen wäre noch, dass das Widerstandselement 3 direkt aus dem Netz gespeist wird, d.h. eine Leistungsregulierung z. B. Phasenanschnittsteuerung ist nicht vorgesehen. 



  
 



   DESCRIPTION



   The present invention relates to a method for welding thermoplastic plastic pipe parts by means of an electrical resistance element.



   The use of electrical resistance heating for connecting plastic pipe parts is known.



   From CH-PS No. 529 628 a method is known in which the heating current is supplied to the resistance element in two stages using an electrical energy metering device, the first stage serving only to ensure good contact between the plastic parts to be welded and the second Stage represents the actual welding process. The heating energy is continuously supplied via the energy metering device during the two stages, and the heating energy can be the same or different during the two stages.



   The disadvantage of this method is that a certain heating energy is continuously supplied to the plastic parts to be welded during a certain period of time and the temperature at the welding point is not monitored.



   The aim of the present invention is to improve a method for welding plastic tube parts so that the disadvantages mentioned do not occur.



   This aim is achieved according to the invention with the features mentioned in the characterizing part of patent claim 1.



   In a preferred embodiment of the method, the resistance values are recorded continuously. This has the advantage that, based on this recording, a statement can be made about the quality of the welded joint.



   The invention is explained below with reference to the accompanying drawings.



   Show it:
1 shows a block diagram of a device for carrying out the method according to the invention,
2 shows a program flow chart for the method according to the invention, and
3 shows a program flow chart of a subroutine of the method according to the invention.



   An exemplary embodiment of a device shown as a block diagram in FIG. 1 is used to carry out the method in question here. The device is divided into a heavy current section and a control current section. The heavy current part comprises a power supply unit 1 for generating the control voltages for the control part, a first electromagnetic switching element 2 for supplying current to an electrical resistance element 3 provided in the pipe parts to be welded (not shown) and a second electromagnetic switching element 4 for to measure the ohmic resistance of the resistance element 3.



   The control section contains a microprocessor 5, which essentially takes over the control of the device, a logic circuit 6, which is connected to the microprocessor 5 and controls the switching elements 2, 4, among other things, a matching circuit 7, which is connected to the microprocessor 5 and the second switching element 4 is connected and converts the resistance values measured on the resistance element 3 into a form which is compatible with the microprocessor 5, and a printer 8 which is connected to the microprocessor 5 and continuously prints out the measured resistance values.



   The function of the device is described below with reference to FIGS. 2 and 3.



   With the actuation of a start pushbutton, the resistance value of the connected resistance element 3 is measured, the measured Q values being converted by the matching circuit 7 into signals compatible with the microprocessor 5. A plurality of # values, which correspond to different embodiments of resistance elements 3, are stored in a table in the microprocessor 5. The measured Q value is compared with the Q values in the table. If this comparison is negative, it is displayed on the device and the resistance element 3 is exchanged for another.



  If the comparison is positive, the device switches to preheating.



   As FIG. 3 shows, this preheating is divided into a heating process and a measuring process, which are carried out at regular intervals, the duration of which can be set in the microprocessor. After the heating process, during which an electrical current flows through the resistance element 3, the system switches over to the measurement process during which the actual value of the resistance value of the resistance element 3 is measured. This actual value is printed out on the one hand by a printer 8 and on the other hand compared with a preheating temperature 100 C). These processes are repeated until the preheating temperature is reached.



   If the preheating temperature is reached, the device switches to welding after a few seconds, which represent a pause. This welding follows the same pattern as the preheating until the welding temperature 1 180 C) is reached. During preheating and welding, the changing resistance value is used as an algorithm to control the computer program. The temperature curve printed out by the printer can be displayed as a graphic or as an alphanumeric printout. This printout can be used as a protocol for the quality of the welded joint.



   It would also have to be added that the resistance element 3 is fed directly from the network, i.e. a power regulation z. B. leading edge control is not provided.

Claims (3)

PATENTANSPRÜCHE 1. Verfahren zum Schweissen von thermoplastischen Kunststoffrohrteilen mittels eines elektrischen Widerstandselementes, dadurch gekennzeichnet, dass der Heizstrom in Intervallen zugeführt wird und dass zwischen den Intervallen die durch den zugeführten Heizstrom verursachte Änderung im Widerstandswert des Widerstandselementes zur Steuerung des Schweissvorganges festgestellt wird.  PATENT CLAIMS 1. A method for welding thermoplastic plastic pipe parts by means of an electrical resistance element, characterized in that the heating current is supplied at intervals and that the change in the resistance value of the resistance element for controlling the welding process caused by the heating current supplied is determined between the intervals. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Widerstandswert des Widerstandselementes vor der Heizstromzufuhr gemessen wird, um den Schweissvorgang festzulegen.  2. The method according to claim 1, characterized in that the resistance value of the resistance element is measured before the heating current supply in order to determine the welding process. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Widerstandswerte angezeigt oder aufgezeichnet werden.  3. The method according to claim 1 or 2, characterized in that the resistance values are displayed or recorded.
CH299/85A 1985-01-23 1985-01-23 Welding together thermoplastic pipes - using resistance heater circuit with microprocessor controller which checks resistance of element and switches system CH665387A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH299/85A CH665387A5 (en) 1985-01-23 1985-01-23 Welding together thermoplastic pipes - using resistance heater circuit with microprocessor controller which checks resistance of element and switches system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH299/85A CH665387A5 (en) 1985-01-23 1985-01-23 Welding together thermoplastic pipes - using resistance heater circuit with microprocessor controller which checks resistance of element and switches system

Publications (1)

Publication Number Publication Date
CH665387A5 true CH665387A5 (en) 1988-05-13

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810795A1 (en) * 1988-03-30 1989-10-12 Huerner Gmbh ELECTRIC WELDING MACHINE FOR THE AUTOMATIC WELDING OF HEATING TURN FITTINGS
DE4435393B4 (en) * 1994-09-26 2004-12-23 Toua Kokyu Tugitevarubu Seizo Co., Hirakata Method for automatically controlling the welding of thermoplastic articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810795A1 (en) * 1988-03-30 1989-10-12 Huerner Gmbh ELECTRIC WELDING MACHINE FOR THE AUTOMATIC WELDING OF HEATING TURN FITTINGS
DE4435393B4 (en) * 1994-09-26 2004-12-23 Toua Kokyu Tugitevarubu Seizo Co., Hirakata Method for automatically controlling the welding of thermoplastic articles

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