Welding plastic, including HDPE (High-Density Polyethylene), involves heating the plastic surfaces to a molten state and then pressing them together to create a strong bond as they cool. There are several methods for welding plastic, including heat fusion welding, extrusion welding, and hot gas welding.

Heat fusion welding: This method involves heating the HDPE surfaces using a specialized tool, such as a hot plate or welding iron, until they reach a molten state. The heated surfaces are then pressed together, allowing them to fuse and form a strong bond as they cool.
Extrusion welding: In this technique, a plastic welding rod is heated and extruded onto the joint between the HDPE surfaces. The molten plastic fills the gap between the surfaces, creating a fusion bond upon cooling.
Hot gas welding: This method uses a stream of hot air to heat the HDPE surfaces, which are then pressed together to form a welded joint. Hot gas welding is commonly used for joining large HDPE components or sheets.
HDPE sheet manufacturers often provide guidelines and recommendations for welding their products, including recommended welding techniques and equipment, to ensure proper bonding and optimal performance of welded joints.

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