RedHead Series Orbital Weldhead

Redheads are designed to make pipe-to-pipe and pipe-to-fitting welds with precision and repeatability. Redheads can be used for fusion welding, or with filler wire addition – an integral head mounted feeder is standard on all models.

Three models cover the size range of 12.7 to 168 mm (0.5 to 6.625”) OD. Digital technology forever eliminates the need for periodic calibration – rotation and wire speed remain accurate regardless of wear, and heads can be interchanged without time-consuming recalibration.

Uniform torch rotation is ensured by a chain and sprocket drive using a precision stainless steel bearing assembly that is immune to heat.





  • Extension Cables
  • Fillet/Socket Weld Kit
  • Extended Clamping Range Kit R-2 allows welding down to 21mm (0.84 inch) OD
  • Extended Clamping Range Kit R-3 allows welding down to 50 mm (2 inch) OD


R-1 (MODEL 427A) R-2R-2 (MODEL 428A)R-3 (MODEL 429A)
ApplicationOrbital GTAW welding of pipe-to-pipe, pipe-to-fittings
Pipe (tube) OD size range13 – 38 mm (0.5 – 1.5”)33 – 90 mm (1.315 – 3.5”)90 – 168 mm (3.5 – 6.625”)
Filler wire module CE standards adoptedWire size: 0.8 mm (0.03”) Max. speed capability: 1900 mm/min. (75 IPM) Spool size: 0.16 kg (0.35 lbs)
Arc gap control moduleMechanical, adjustable
Torch propulsion module0 – 4.0 rpm0–1.5 rpm0–0.6 rpm
Water-cooled torch200 A continuous
Torch adjustment capabilityTorch lead/lag adjustment: ± 15 degrees (manual) Torch tilt adjustment: Requires optional socket weld kit
Cable length7.6 m (25’) standard. Extension cables available.
Power supply compatibilityTubemaster 514, Pipemaster 515, Pipemaster 516
Dimensions/weightsR-1 (MODEL 427A) R-2R-2 (MODEL 428A)R-3 (MODEL 429A)
Weight3.9 kg (8.5 lbs.)5.4 kg (12 lbs.)9.0 kg (20 lbs.)
Axial Clearance (Torch C/L to Rear Extremity) (A)127mm (5.0”)10mm (0.41”)127mm (5.0”)
Axial Clearance (Torch C/L to Front Extremity) (B)10mm (0.41”)10mm (0.41”)10mm (0.41”)
Width (C)140mm (5.5”)191mm (7.5”)280mm (11.0”)
Radial Clearance Requirement (D)[140mm (5.5”) – Pipe O.D.] ÷ 2 = Radial Clearance[191mm (7.5”) – Pipe O.D.] ÷ 2 = Radial Clearance[280mm (11”) – Pipe O.D.] ÷ 2 = Radial Clearance