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Welding Sleeves

Welding sleeves include an inserted conductor for the link of thermoplastic material pipes are well-known, where the conductor is smallest amount in part made up of a resistance heating wire.


A welding sleeve for linking pipes shaped of thermoplastic material includes an electrical conductor in the form of an electrical resistance wire. The resistance wire extends approximately the sleeve and has a pair of reverse ends for conveying current through the wire. The reverse ends of the wires can be joined directly to a starting place of electrical current, for instance a 220° V.about.line. It is not necessary to give welding transformers or timing relays.

A melting substance material is incorporated into the conductor between its split ends and it melts through when the energy required for welding the sleeve has been developed. After the current is supplied through the sleeves resistance wire, the welding process is finished when the predestined melting material melts through. Such welding sleeves can be artificial in a mass production process, and the welding sleeves are much safer than the conventional devices used to-date.



Welding sleeves generally are shaped of the similar material as the pipes to which they are welded, whether they are constructed as conventional welding sleeves for the manufacture of a unending link between two pipes or are provided at one side with a thread and thus form fittings provide the pipe ending onto which they are welded with a thread. In carrying out the welding sleeves operation, particularly constructed manage devices are used so that the voltage apply to the resistance heating wire and the period of the heating process can be set. Such devices must be available at any building site at which the welding sleeves are used, and generally at big construction sites where more than a few workers are needed for the link of the thermoplastic pipes, more than a few devices are required even though the devices may not be used for days at a time. As a consequence, such devices involve a substantial investment and there is the well-known disadvantage that such devices may be spoiled at a building site or they might become lost or even stolen.

A worker can set the time period for the flow of current necessary for the welding process and in addition also set the required voltage, however, there is the likelihood that if these values are set incorrectly, it could go in front to errors in the welded link. Welding sleeves are variety of disadvantages can be banned by utilizing the welding sleeve embodying the present invention which is characterized in that the conductor includes a predestined melting fabric sized so that it melts around at the time when the energy supplied through the heating conductor, necessary for the welding of the sleeve, has been developed.

It is only required to guarantee that the welding sleeve manufacturer attaches a notice about the voltage to be utilized. Such a device is employed in Europe generally 220° V.about. is used, since such a voltage is available at all building sites. In accordance with the present invention, the only supplementary means wanted is a two-conductor cable with a plug up for the 220° V.about., a deferral switch, and a plug device which can be joined to the conductor and, as a outcome, no operational errors should happen and the price and the risk of improper welding are considerably smaller than in the use of the control devices which have been employed to-date.

The various features of novelty which characterize the creation are sharp out with individuality in the claims annexed to and forming a part of the creation, its operating advantages and particular objects attained by its use, sign should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.




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