A tubing including an overmold is connected to a fitting by welding the overmold to the fitting. Methods for doing the same are also provided. Also provided are methods for forming an overmold on a tubing or on a tubing and fitting assembly.Un tube comprenant un surmoulage est relié à un raccord par soudage du surmoulage audit raccord. L'invention concerne également des procédés pour réaliser ledit moulage modulaire. L'invention concerne par ailleurs des procédés pour former un surmoulage sur un ensemble tube et raccord.