The invention relates to a connecting device (1) for connecting a first part comprising the connecting device (1) with a second part. The connecting device comprises a snap-in element (3) with a bottom (6) on which at least one lateral wall (8) is disposed and which is configured to receive a mating element disposed on the second element by snap-in action. A connecting element (2) produced from a weldable polymer is arranged on the bottom (6) and/or on the at least one lateral wall (8).
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