Title:
ELECTRIC WELDING BUSH
Document Type and Number:
Japanese Patent JPS55126416
Kind Code:
A
Abstract:
A heating wire (6) is inserted in turns, which are at a distance (7) from the adjacent turns and whose ends are connected to contacts (8) for connection to a welding apparatus, in a collar body (4), in the vicinity of the inner wall (5). The heating wire has a thermal coefficient of expansion of less than 10 x 10<-6>. In order to produce welded connections, the collar (3) is pushed onto pipe connecting stubs (1, 2) and heat is produced in the heating wire (6), as a result of which heat the collar body (4) and the pipe connecting stubs (1, 2) are partially softened. Since the collar body (4) has a shrinkage reserve which is released when the material is softened, it rests against the connecting stubs (1, 2), cancelling out an assembly gap (10). As a result of the low thermal coefficient of expansion, winding shorts or other deformations of the heating wire (6) before the thermoplastic material softens are prevented.
Inventors:
HAINTSU NIFUERAA
RUDORUFU BUURI
RUDORUFU BUURI
Application Number:
JP3419480A
Publication Date:
September 30, 1980
Filing Date:
March 19, 1980
Export Citation:
Assignee:
VON ROLL AG
International Classes:
B29C65/00; B29C53/00; B29C65/20; B29C65/34; F16L47/03; (IPC1-7): B29C27/06
Domestic Patent References:
| JPS3419773Y1 | ||||
| JPS471990A | ||||
| JPS5237984A | 1977-03-24 | |||
| JPS5147065A | 1976-04-22 |
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