Patent ID: 8430145

Claim:
A hot gas nozzle adapted for heating an end section of a double tube, where the double tube comprises a first tube and a second tube, the hot gas nozzle comprising: a first inner nozzle insert and a second inner nozzle insert, where the inner nozzle inserts comprises a plurality of outlet openings adapted to heat an internally located section of the first tube and the second tube with hot air, wherein the hot gas nozzle further comprises a first outer nozzle insert and a second outer nozzle insert, where the outer nozzle inserts comprise a plurality of outlet openings adapted to heat an external section and between the first tube and the second tube located section of the double tube, which section after a sealing of the double tube will join the first tube and the second tube; wherein the hot gas nozzle further comprises a cooling ring adapted to cooperate with the hot gas nozzle; and wherein the cooling ring comprises two openings in which the first inner nozzle insert and the second inner nozzle insert fits.