What challenges arise when welding polyethylene sheets for curved sculpture surfaces?

Welding polyethylene sheets for curved sculpture surfaces presents several unique challenges. First, polyethylene's low surface energy makes adhesion difficult, requiring specialized welding techniques like hot gas or extrusion welding. Second, the material's high thermal expansion coefficient can lead to warping or distortion when heated, complicating precision work on curved forms. Third, achieving consistent heat distribution across uneven surfaces is tricky, often resulting in weak joints or burn-through. Additionally, polyethylene's flexibility can cause alignment issues during welding, especially for large or complex curves. Finally, ensuring structural integrity while maintaining artistic integrity demands careful planning and skilled execution. These challenges require artists and fabricators to adapt their methods, often combining mechanical fastening with welding for optimal results.