A process model has been developed with the aim of improving quality control for hot wedge weld seams using a data-assisted system (Lueders 2000). Based on a functional relationship between a quality criterion and suitable process parameters a numerical quality standard is identified. Whether it is satisfied can be checked relying solely on parameters provided by the welding machine on the construction site. This paper will explain the way the model can be used for direct selection of the correct weld parameters and for providing assurance of seam quality on construction sites. The results of an extensive testing project, sponsored by geomembrane manufacturers and installation companies through their joint Ground Water Protection Working Group (Arbeitskreis Grundwasserschutz -AK GWS), will demonstrate the practical advantages for the welder, for maintenance requirements and for quality management.
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