Model 8 Series Narrow Weld Heads

The Model 8 series weld heads are orbital weld heads for fusion (GTAW) welding of fittings, tubing and thin wall pipe. The narrow width of these heads 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 autogenously weldable alloys.

A key feature of the Model 8 series weld heads is its unique cooling design, allowing high duty-cycle welding. When connected to an AMI cooling unit, all components of this weld head are liquid-cooled, including cables, clamp housings and electrode rotor.

A variety of clamps are available to perfectly suit every welding application. For fitting-to-fitting or tube-to-fitting welds the standard (narrow) clamps require the least amount of stick-out.

Compatible with all AMI Power Supplies.

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Weld Schedule Development Quick Reference Guide

  • Water Cooling

Quick Specs

  Model 8-2000 Model 8-4000 Model 8-6625
Tube/Pipe OD Range 0.25" - 2.00"
6,3 mm - 52 mm
0.50" - 4.094"
12,7 mm - 104 mm
2.00" - 6.625"
51 mm - 169 mm
Travel Motor D.C., P.M., D.C. Tachometer
Head Weight 6 lbs. (2,7 kg) 10 lbs. (4,5 kg) 17 lbs. (7,7 kg)
Electrode Size 1/16" and 3/32" (1,59 mm and 2,38 mm)
Rotor RPM 0.1 - 10.0 0.1 - 10.0 0.1 - 2.0
Cable Length 25 ft. (7,6 m) when connected to adapter cable (included with Power Supply)
Water Cooling Allows high duty-cycle for heavy wall applications
Model 8 Series

8-2000 8-4000 8-6625
Tube/Pipe
OD Range
0.25" - 2.00"
6,35mm - 52mm
0.50" - 4.000"
12,7mm - 104mm
2.00" - 6.625"
51mm - 169mm
A 13.44"
341,4mm
16.25"
412,9mm
20.26"
515mm
B 2.81"
72mm
3.87"
97mm
5.42"
138mm
C 2.75"
70mm
3.75"
95mm
5.50"
140mm
D 5.50"
140mm
7.50"
190mm
11.00"
280mm
E* 0.85"
21,6mm
0.85"
21,6mm
0.85"
21,6mm
F* 1.75"
43,2mm
1.75"
44,5mm
1.75"
44,5mm

* "E, and F" dimensions with standard Model 8 (narrow) clamp inserts.