The widest range of orbital welding equipment in the world The Model 8 series orbital weld heads are designed for fusion (TIG) welding of tube, thinwall pipe and fittings through the range of 0.25” (6 mm) to 6.625” (168 mm) OD (outside diameter) and wall thicknesses up to 0.160” (4 mm). The narrow width of these heads makes them ideal for fitting-to-fitting welds and other limited-clearance applications. Model 8-2000 Model 8-6625 The Model 8 series weld heads incorporate a two-sided clamping mechanism - precision machined and designed to compensate for significant diameter variances while ensuring positive clamping force and concentricity. The insert sizes accommodate an extensive range of applications and all Model 8 series weld heads are fitted with water-cooling capability - for heavy wall material welding and/or high duty-cycle requirements. Model 8-4000 Model 8-2000 Tube/Pipe OD Range Model 8-4000 Model 8-6625 0.25” - 2.00” 6,3 - 52 mm 0.50” - 4.00” 12,7 - 104 mm 2.00” - 6.625” 51 - 169 mm Travel Motor Head Weight D.C., P.M., D.C. Tachometer 6 lbs. (2,7 kg) 10 lbs. (4,5 kg) 17 lbs. (7,7 kg) 1/16” and 3/32” (1,59 mm and 2,38 mm) Electrode Size Rotor RPM 0.1 - 10.0 Cable Length 25 ft. (7,6 m) when connected to adapter cable (included with Power Supply) Water Cooling Recommended for heavy wall or high duty-cycle applications Compatible with all AMI Power Supplies. 0.1 - 10.0 0.1 - 2.0

OD RANGE/DIMENSIONS Model No. Dimensions Tube/Pipe OD Range A B C D E* F* 8-2000 0.25” - 2.00” 6,35 - 52 mm 13.44” 341 mm 2.81” 72 mm 2.75” 70 mm 5.50” 140 mm 0.85” 21,6 mm 1.75” 44,5 mm 8-4000 0.25” - 4.00” 6,35 - 104 mm 16.25” 413 mm 3.87” 98.3 mm 3.75” 95 mm 7.50” 190 mm 0.85” 21,6 mm 1.75” 44,5 mm 8-6625 2.00” - 6.625” 51 - 169 mm 20.26” 515 mm 5.42” 138 mm 5.50” 140 mm 11.00” 280 mm 0.85” 21,6 mm 1.75” 44,5 mm * “E, and F” dimensions with standard Model 8 clamp inserts OPTIONAL ACCESSORIES Tungsten extender — to weld short stick-out components Fitting support mandrel — to facilitate the...