Arc Machinesâ introduces the Model 8-2000 weld head, an orbital weld head used for fusion TIG (GTAW) welding of fittings, tubing and thin wall pipe. The narrow width of the head makes it ideal for limited clearance applications, such as welding fitting-to-fitting or fitting-to-valve body assemblies. Welds materials such as stainless steel, titanium, Hastelloy, and other weldable alloys. When connected to an AMI cooling unit, all components of this weld head are liquid-cooled, including cables, clamp housings and electrode rotor (patent pending). The Model 8-2000 size ranges from 0.25â? O.D. to 2.00â? O.D. (6.35mm to 52mm O.D.). This model is ideal for food, dairy, beverage industries and fabrication shops as well as biomedical and pharmaceutical installations.