Composite pipe with integral socket

A composite pipe comprising

• a smooth internal pipe (3),
• an external pipe (4) alternately provided with first annular corrugation crests (5) and first annular corrugation troughs (8) each having a bottom (9), the internal pipe (3) and the external pipe (4) being welded together at the bottom (9) of the first corrugation troughs (8), the internal pipe (3) and the external pipe (4) forming a pipe section (1, 2) with a central longitudinal axis (25), and
• a socket (10,10') with a bottom (11), which socket (10,10') is molded on in-line at one end of the pipe section (1) and which
• at its bottom (11), adjoins the internal pipe (3) and the external pipe (4) of the pipe section (1) by an expanded section (12),
• subsequent to the expanded section (12), comprises a smooth-walled and substantially single-walled section (13, 13'), having a length a in the direction of the central longitudinal axis (25) which corresponds at least to the length of one and a half first corrugation crests (5) and one first corrugation trough (8) of the pipe section (1, 2) in the direction of the central longitudinal axis (25),
• subsequent to the smooth-walled section (13, 13'), is formed as a composite pipe section (14) having an internal pipe section (17, 17') and an external pipe section (18) with at least two second annular corrugation crests (19) which are smaller than the first annular corrugation crests (5), and
• subsequent to the composite pipe section (14), comprises an inlet (15).