FremgangsmÕte for sveising av overveiende stangformede konstruksjoner av fluorinneholdende plastmateriale i en buttsveis

摘要

A method of butt welding two generally rod-shaped structures of a fluorine-containing plastic material includes the steps of placing end faces of the structures in a contacting relationship by supporting each structure in a clamping device, applying heat to the end parts of the structures that project from the clamping device, and pressing the end faces together by moving the clamping devices towards each other to apply a welding pressure of between 0.05 and 0.5 Nmm-2 perpendicular to the end faces. The heating element surrounds the end parts along a substantially closed contour, and may comprise two segments which can be hinged into an open or closed position to be removed from the completed weld. The heating element may be energized in accordance with a predetermined heating profile, wherein the temperature of the weld area is measured and the heating operation of the heat generating member is increased or decreased to transmit and absorb heat from and into the heat reservoir member such that the temperature of the weld area is maintained within a predetermined margin around the heating profile.