schweißstreifen for bonding thermoplastic coatings at a junction, and processes for the manufacture of such a schweißstreifens

摘要

The thermoplastic lining at a joint between adjacent lined pipe sections is sealed by means of a preformed elongated flat strip of thermoplastic material having resistance heater elements in spaced parallel relation along either side of the strip. The strip is placed circumferentially around the inside of the joint with the width of the strip bridging the joint and with the heater elements in contact with the respective liners on either side of the joint. Pressure is applied radially outwardly against the strip to urge the strip against the liners, and electric current is then passed through the heater elements to fuse the strip to the respective liners and seal off the joint.