Weld heads · micro heads

Specifications

Process	GTAW (TIG), autogenous fusion butt welding
Model 9-250	0.093″ – 0.250″ OD (2.3 – 6.3 mm) — extreme clearance limits
Model 9-500	0.093″ – 0.500″ OD (2.3 – 12.7 mm), air cooled, 1.75 lbs
Model 9-500C	Same range and tooling as the 9-500, air or water cooled, higher duty cycle
Quick Release Kit	Available on the 9-500C — remote loading of the clamp inserts
9-250 dimensions	10.00″ L, 0.83″ × 0.66″ × 1.31″ head envelope
9-500 dimensions	9.60″ L, 0.96″ × 1.29″ × 2.58″ head envelope
Cable length	9-500: 20 ft (6 m) · 9-500C: 10 ft (3 m)
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

• 9-500 and 9-500C are the same size and share the same tooling — the difference is cooling and duty cycle
• 1.75 lbs means the operator can hold position all shift
• The head that fits inside a gas cabinet

On our bench

Micro heads live hard: dropped, run without coolant, cables pinched in a cabinet. Rotors, motors, encoders, clamp inserts and cables are all rebuildable, and calibration comes back with the repair.

Technically these are 9 Series heads — see the full 9 Series range if you need something larger than 1/2 inch.