Abstract
This chapter provides an overview on extrusion welding that is a reliable technique developed from hot gas welding. In extrusion welding, a thermoplastic filler identical to the material being welded is extruded into a groove in the preheated weld area. It is commonly used in apparatus engineering and in laying waterproofing membranes for ground water protection applications, using extruded sheet and profiles made of polyolefins. Extrusion welding has also been used to join corrosion-resistant steel pipe lined by a thermoplastic layer, either in the shop or in the field, for use in the oil, gas, chemical, marine, and mining industries. The filler material fills the groove and forms a weld after cooling. Extrusion welding is usually performed manually, although it can be automated. It is a cost effective process that can be used to weld parts of varying geometries, and thick polyolefin parts can be welded in one step. The extrusion welding process is depicted through a diagram in the chapter for a V-type seam.
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