DE1014803B - Socket weld connection for plastic pipes - Google Patents

Description

GERMAN

The butt weld connections and are used as connections for pipes made of weldable plastics known the socket weld joint. In the case of the butt weld connection, the two pipe ends brought to welding temperature by means of a heating plate and then pressed together and so with each other welded (Fig. 1). In the case of the socket weld connection, the two pipe ends are opened the outer surface is heated to sweat temperature and with a sleeve pushed over it, the inner surface of which has been heated to welding temperature, connected, whereby the necessary pressure is applied by means of appropriately shaped pliers (Fig. 2 and 3). According to a further known method, the necessary Welding heat an electric heating wire spiral inserted into the socket is used.

In the case of the known butt-welded connection, the durability is sufficient despite proper execution often does not meet the requirements, especially if the pipes expand and with moderate heating buckle and thereby maintain the welded connections under alternating bending stress. The reason for this disadvantage is the relatively small load-bearing connecting surface. At socket welding the load-bearing surface is larger and the durability is better. However, this is disadvantageous the deflection of the force flow and the notch effect at the socket end as a result of the stiffening by the Sleeve.

To avoid the disadvantages indicated, it is proposed according to the invention to combine the butt welding with the socket connection (Fig. 4) in such a way that both the end faces and the outer surfaces of the socket and pipe are welded to one another. The necessary welding heat can be generated using known methods, such as heating by means of a mandrel, electrical heating wire spiral, etc. This combination reduces the sharp deflection of the force flow of the socket connection, while its advantages - enlargement of the load-bearing surface - are retained. To further reduce the unfavorable notch effect caused by the sudden transition from the flexible pipe to the stiffer socket, the socket can be flattened conically towards both ends (Fig. 5). The end faces can also be kept conical, which results in a better interlocking of the socket weld joint
for plastic pipes

Applicant:

Farbwerke Hoechst Aktiengesellschaft

formerly Master Lucius & Brüning,

Frankfurt / M.

Dr.-Ing, Kurt Richard, Bad Soden (Taunus),

Georg Diedrich, Neuenhain (Taunus),

and Dipl.-Ing. Erwin Gaube, Kelsterbach / M.,

have been named as inventors

is enough. A modified form of this connection is the training as an inner sleeve (Fig. 6 and 7), the is particularly suitable for solidified pipes. It can, however, also be used for unconsolidated pipes will. With this connection, the pipe ends can be widened somewhat if the flow cross-section of the pipe should be preserved in its full height.

Claims (3)

PATENT CLAIMS: 1. Socket weld connection for plastic pipes, in which the on their outer surfaces with the A socket welded to pipes has a central web, characterized in that the socket (1) except on the lateral surfaces (5) also on the end faces (6) of the central web (2) or the Pipe ends. (3, 4) is welded, the generation of the welding heat in a per se known Way done. 2. Socket weld connection according to claim 1, characterized by a conical, extending on both sides Sleeve (1) and straight or conical, executed. Middle day (2). 3. socket welded joint according to claim 1, characterized in that the socket as an inner socket is executed.