FGI Welding Basics  Part 3: Welding Parameters

Welcome to Part 3 of our Online Welding Basics for Geomembranes course, presented by Gus Fauci from DemTech, Eddie Weiser from Leister Technologies, and Dr. Timothy Stark from the University of Illinois at Urbana-Champaign. In this video session, we dive deep into the critical relationship between the three fundamental welding parameters: heat, speed, and pressure. You'll learn how to establish and maintain proper welding windows, understand why even small imbalances in these parameters can lead to weld failures, and see the real-world consequences of poor parameter control. Our presenters will demonstrate trial weld testing procedures, explain how ambient conditions impact welding quality, and show you why manufacturers cannot provide universal welding parameters. This session emphasizes the importance of documentation, proper overlap techniques, and maintaining clean working conditions to ensure long-term geomembrane system integrity.
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Our team

Meet your instructors

Eddie Weiser
Eddie Weiser is an expert in the field of geomembrane welding and is frequently asked to consult with industry professionals and academics in such matters, including the analysis of welding defects. Eddie has been working at Leister Technologies AG since 2013 and has been heavily involved with the development and launch of several geomembrane welding machines. This work has taken Eddie all over the world where valuable insights and knowledge has been exchanged in all aspects of geomembrane welding.
Gus Fauci
Gus Fauci has over 29 years of welding, testing and training experience in the geosynthetic industry. He has more than 10 million square feet of installation experience including geomembranes, geotextiles, and geocomposite. Gus provides testing and technical support with numerous types of materials, such as establishing welding specifications for material manufacturers. Gus has conducted advanced training workshops for thousands of technicians and CQA personnel and proctored hundreds of Certified Welding Technician Certifications for the liner industry.
Dr. Timothy D. Stark
Dr. Timothy D. Stark is a Professor in the Department of Civil and Environmental Engineering at the University of Illinois at Urbana-Champaign with an expertise in Geotechnical Engineering. He is the Technical Director of the FGI, which is an industry sponsored research organization investigating the advantage and disadvantages of geomembranes for containment and seepage applications. His research interests include the performance of geomembranes and stability of geosynthetic lined slopes.

Course Structure

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