Thermoplastics welding method

摘要: A welding method for joining self-supporting structures made of thermoplastics by assembling said to form an area mutual overlap, generating heat in produce a zone having elevated temperature and containing at least plastic state coalescence area; expanding agent is provided the generate gas pressure therein promoting weld. The invention particularly suitable tubes other pipeline elements, such as fittings or sleeves, produces tumescent weld which fills any macroscopic voids while including plurality minute closed cell voids.