foerfarande foer reglering av svetsningsfoerloppet vid framstaellning av i muffoerbindning foer vaermeisolerade ledningsroer.

摘要

A process for controlling the welding operation in the production of a socket joint for thermally insulated line pipes by means of resistance heating, where the temperature of the resistance wire is constantly measured during current passage. At a second measuring point, the temperature of the welding pool is measured between two windings of the wire. At first, the wire temperature, the maximum value of which is limited, is used as a controlled variable, and subsequently the welding pool temperature is used as a controlled variable, for the heating power. IMAGE