Weld heads · narrow closed heads

Specifications

Process	GTAW (TIG), autogenous fusion, enclosed chamber
Model 8-2000	0.25″ – 2.00″ OD (6.3 – 52 mm), 6 lbs, 0.1 – 10.0 RPM
Model 8-4000	0.50″ – 4.00″ OD (12.7 – 104 mm), 10 lbs, 0.1 – 10.0 RPM
Model 8-6625	2.00″ – 6.625″ OD (51 – 169 mm), 17 lbs, 0.1 – 2.0 RPM
Clamping	Two-sided precision-machined clamping, adjusts to diameter variation
Cooling	Water cooling recommended for heavy wall or high duty cycle
Drive	All-gear drive mechanism
Compatibility	All AMI power supplies

Specifications from published AMI documentation. Confirm against the manual for your serial number — these machines changed over the years.

Worth knowing

• Narrow body gets into clearances other heads cannot
• Gear drive holds rotation speed under load — which is what holds your bead
• Same tooling logic across the three sizes

On our bench

What comes across our bench: rotors and drive gears, motors and encoders, coolant leaks, worn clamp inserts, cable bundles dragged one job too many, heads that will not home. Heads take the beating — and they rebuild.