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Tweco Ultrafeed VAF-4HD

Tweco Roto-Ground is a highly efficient device for grounding weldments while being rotated on turning rolls or positioners . The 2" shaft shoulders up to the steel nut which the user welds to his rotating work or fixture. Tweco Roto-Grounds have no brushes, springs or mercury. A simple adjusting bolt provides maximum efficiency.

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Process Capability: MIG (GMAW), Flux Cored (FCAW)

  • Advanced Adjustable Features for Optimum Welding Performance; Preflow, Run In, Ramp Time, Postflow, Burnback, Crater Control, Spot & Stitch.
  • Heavy Duty 4 Roll Drive System for superior wire feeding
  • Digital Meters: Voltage and Amperage/WFS; Preview and Hold capability.
  • Trigger & Spot Control: 4T (Latch) eliminates operator fatigue, spot welding capability.
  • Weld Schedules: Allows operator to store two optimized welding parameters then digitally recall them with perfect repeatability.
  • Inch & Purge Buttons for advancing wire or purging shielding gas.
  • Circuit Breaker Protection: No fuses required.
  • Indicator Lights to identify power and faults; plus control settings over amps and wire feed speed for IPM or MPM.
Other Features:
  • Robust heavy duty rear spool and coil mounting with lifting eye.
  • Heavy duty base with no slip feet.
  • Standard Tweco No. 4 welding gun quick disconnect.
  • Large 1-5/8" diameter drive rolls. (VAF-4HD)

Welding Process

  • FCAW - Flux Core Arc Welding
  • GMAW (MIG/MAG - Metal Inert Gas / Metal Active Gas)


Input Voltage

Frequency 50/60 Hz
Phase 1
Voltage 115 V


Burnback Time 0-1 sec
Gas post flow 0-30 sec
Gas pre flow 0-5.0 sec
Maximum Pressure 100 psig (7 bar)
MCableX 19 Pin
Spot Weld Time 0-20 sec
Standards IEC 60974-1, CSA E60974-1, UL 60974-1