WELDING METHOD OF ELECTRIC WELDING JOINT

PURPOSE:To reduce production cost and to easily correspond to a joint of a different kind or a joint different in caliber by stopping the supply of a current at a point of time when the resistance value of a heating element becomes a predetermined value during the supply of a current. CONSTITUTION:A...

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Bibliographische Detailangaben
Hauptverfasser:	OSHIMO SHINZABURO, TANABE ISAMU, INOUE TOSHIO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BLASTING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PIPES SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To reduce production cost and to easily correspond to a joint of a different kind or a joint different in caliber by stopping the supply of a current at a point of time when the resistance value of a heating element becomes a predetermined value during the supply of a current. CONSTITUTION:A pipe 14 composed of polyethylene or the like is inserted in the receiving port of an electric welding joint 10 and the wire 34 from the terminal 32 of a current supply device 22 is connected to the terminal of the electric welding joint 10. When a power supply is turned ON, the initial resistance value R0 of a resistance wire 18 is detected by the resistance value detection circuit 30 of the current supply device 22 to be applied to a current supply control circuit 26. When a current is supplied to the resistance wire 18 by a current supply circuit 28, the temp. of the resistance wire 18 rises and the resistance value R of the resistance wire 18 increases and the resistance value detection circuit 30 detects the resistance value R of the resistance wire 18 any time and the value R is applied to the current supply control circuit 26 and the current supply control circuit 26 compares the resistance value R with the value R1 stored in a memory and stops the supply of a current at the time of R=R1.