Hot Extrusion Process

The Hot Extrusion Process

Our patented hot extruded manufacturing process produces wire products that are unsurpassed in quality. This process technology allows us to manufacture small diameter solid welding wire from alloys with very limited ductility. The hot extruded process consists of assembling a billet housing that contains coated alloyed rods of desired chemical composition. The billet is then prepared for the extrusion process. It is heated to a high temperature, above the material’s re-crystallization temperature, to prohibit hardening and allow for an easier extrusion. The material is then extruded to a predetermined size.

Afterwards, the billet is split, revealing long strands of small diameter wire, and can be further processed with center-less grinding to reach the final size. The wire is then cut to length for TIG wire or butt welded together and spooled. During final processing the wires are passed through a rigorous cleaning procedure that ensures the welds are free from contamination.

Polymet’s hot extruded wire products are available in nickel and cobalt-based alloys, many of which are are held to the highest quality standard of specifications in the industry (General Electric, Pratt & Whitney, Rolls Royce, and Honeywell). Products that are produced through this manufacturing process can range from .012″ – .093″ diameter. These solid wire products are primarily used in the aerospace industry but are also used in lumber and valve applications.