Device for detecting, during welding, variation in the physical

Details Device for detecting, during welding, variation in the physical Device for detecting, during welding, variation in the physical

1989-12-15

1992-02-04

Wityshyn, Michael G.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

1562742, 1563043, 1563797, 219496, 219541, H05B 348, H05B 358

Patent

active

050862138

ABSTRACT:
The invention concerns a device for detecting variations in the physical state of the plastic material in a coupling piece used for welding pipes and incorporating a heating resistor, cavities which the softened material can enter and sensors for detecting the state of the material within the cavities. According to the invention, in order to obtain a weld of high quality, it is necessary for the distance between the bottom of the cavities and the part of the resistor nearest this bottom on the one hand, and for the linear dimension in the cross-section of these same cavities near their bottom on the other, to be less than or equal to the thickness of the material which is softened during the heating of the pieces. The invention applies to the control of the welding of sections of piping, particularly for the gas industry.

REFERENCES:
patent: 4684417 (1987-08-01), Grandclement
patent: 4703150 (1987-10-01), Kunnecke et al.
patent: 4727242 (1988-02-01), Barfield

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