Model 501 Pipe Welding Power Supply

The Model 501 was designed to supply resistance heated filler wire near melting temperatures to weld pool, thereby increasing the energy available to melt the base metal.

High deposition rate = High productivity

The Model 501 is suitable for welding high-quality stainless steel tanks and vessels that are rotated during welding. The addition of hot wire can optimize the corrosion resistance and/or mechanical properties of the weldment and have a beneficial effect on the material performance in service. The hot wire GTAW process produces a very clean weld with a very low incidence of porosity and increases filler deposition rates similar to GMAW.


  • Constant Voltage (CV) True RMS mode-of-operation
  • Calibrated Precision Closed Loop Servo Output Control
  • Voltage Feedback Sensing at the wire feed tip or internal to the Power Supply
  • True RMS instrumentation Outputs (Amps and Volts)
  • Optional Manual Remote Programming Pendant
  • Control input for connection to an external controller

The Model 501 implements advanced technology with significant competitive advantages. To minimize magnetic interference , the unit uses AC current to preheat the wire. This current is far more precise than competitive machines, being very close to a true sine wave.

The Model 501 Hot-Wire Power Supply can be used:

  • as a stand-alone unit with its own Operator Pendant
  • with the AMI Model 415 Power Supply/Controller
  • or by and external weld process controller programmer
  • 0-17V Hot Wire
  • 250 Amps
  • AC-DC
  • Single Phase

Quick Specs

Input Power: 200 - 240 VAC, 25 A, 1Ø
Output Power: CV Mode 0-10 V True RMS AC, +/- 3% max.
Open Circuit Voltage: 16 VAC
Loop Response: 1.2 sec
Dimensions: Heigth: 23" (585 mm)
Width: 19" (485 mm)
Length: 9.5" (240 mm)
Weight: 135 lbs. (61,5 kg)