How are fusion welds created in geomembrane applications?

Fusion welds in geomembrane applications are created by melting two surfaces of high-density polyethylene (HDPE) together using heat. This process involves applying controlled heat to the edges of the HDPE sheets until they reach a molten state, after which the two edges are pressed together. This method ensures a strong bond as the materials fuse at a molecular level, creating a continuous and impermeable barrier, which is essential in applications such as landfill liners, where preventing leakage is critical to protecting the environment.

The other techniques mentioned do not achieve the same results as fusion welding. Using chemical adhesives may provide surface bonding but does not offer the same structural integrity or impermeability that a fusion weld provides. Stitching the materials together can lead to potential weaknesses and leaks, as the stitching does not create a seamless barrier. Similarly, using a high-pressure water jet is more appropriate for cutting or cleaning surfaces than for creating a durable bond, as it does not involve the melting or joining of materials.