Welded PE fitting PE fittings, often referred to in the industry as butt fusion or electrofusion fittings, represent a critical junction in the modern piping infrastructure that moves water, gas, and industrial chemicals across the globe. At their core, these components are not simple connectors like a threaded elbow or a compression coupling; they are engineered interfaces designed to become one with the pipe itself. The principle hinges on the thermoplastic nature of polyethylene, a material that, when heated to its melting point and pressed together, creates a molecular bond that is as strong as, if not stronger than, the parent pipe material. This process, commonly known as butt fusion welding, involves specialized machinery that clamps the pipe and the fitting, faces off the ends to ensure they are perfectly flat and parallel, heats them with a polished hot plate, and then brings them together under controlled pressure to form a homogeneous joint.