WATERPROOFING AN EXPANSION JOINT expansion joint waterproofing welding process, easily deformed and difficult to corrosion, small cracks. Structural stability, non-porous, high strength, thread clear, glossy texture. Emergency repair and replacement of Expansion Joint at site in a hot or cold condition. Export Hi-Qlty Expansion Bellows. Fast Delivery, Inquiry Now. View Products. Make An Inquiry. Types: Engineering Product, Tailor Make Product.