What are the best practices for welding seams in polyethylene outdoor trash cans?

Welding seams in polyethylene outdoor trash cans requires specific techniques to ensure durability and weather resistance. The best practices begin with proper surface preparation, which involves thoroughly cleaning the area around the seam with isopropyl alcohol to remove contaminants that could weaken the bond. For high-density polyethylene (HDPE) trash cans, use a poly welding rod specifically designed for polyethylene materials rather than generic plastic welding rods.

The welding temperature should be carefully controlled between 300-350°C (572-662°F) using a specialized plastic welding gun. Move the welder in a consistent, slow motion while applying steady pressure to the welding rod to ensure complete fusion with the base material. For extra strength in high-stress areas, consider implementing a double-weld technique where you create an initial seam followed by a reinforcing weld bead.

After welding, allow the seam to cool naturally without forced cooling methods, as rapid temperature changes can create stress points in the polyethylene. Finally, inspect the weld for consistency and smoothness, ensuring there are no gaps or weak points that could compromise the trash can's integrity when exposed to outdoor elements and heavy use.