Abstract: The invention relates to a method for producing thermoplastic hollow articles, comprising: producing web-shaped or plate-shaped parisons from melted plastic in such a way that the parisons receive a specific wall thickness profile; cooling the parisons to obtain dimensionally stable semifinished products that still have the same wall thickness profile; heating the semifinished products and shaping the heated semifinished products into parts of a hollow article; and welding the semifinished products together to obtain a substantially closed hollow article.