Model 79 Series Full-Function Weld Heads

The Arc Machines' Model 79 series weld heads are economical, easy-to-use, sturdy weld heads designed for precision orbital welding - with or without filler wire - of tube, pipe, and fittings.

Each Model 79 weld head features Arc Voltage Control (AVC) for precise arc gap control, programmable oscillation (weaving) and a precision wire feeder and wire entry mechanics. All Model 79 weld heads operate using the GTAW (TIG) process and will accommodate a range of pipe sizes from 0.75" OD to 6.625" OD (19 mm to 170 mm) and wall thicknesses up to 0.75" (19 mm).

Features

  • Precision orbital welding heads - with or without filler wire - of tube, pipe, and fittings.
  • Versatile and compatible with a variety of joint
    designs, such as “V” prep, “J” prep,
    socket and square butt
  • Accommodates tube, pipe and fittings from 0.75” OD to 6.625” OD (19 mm - 170 mm) with wall thicknesses up to 0.750”. (19 mm)
  • Will weld materials ranging from carbon or stainless steels to exotic alloys including Hastelloy®, Inconel®, and Monel® as well as all other TIG weldable materials.

Compatible with the AMI Model 227 and Model 415 Power Supplies.

  • Arc Voltage Control
  • Oscillation
  • Travel Speed
  • Wire Feed

Quick Specs

  Model 79-2375 Model 79-3500 Model 79-4500 Model 79-6625
Wall Thickness up to 0.44"
11 mm
up to 0.44"
11 mm 
up to 0.675"
17 mm
up to 0.75"
19 mm
Rotation Speed 0.1 - 5.0 RPM 0.05 - 2.0 RPM  0.05 - 2.0 RPM  0.05 - 2.0 RPM 
Torch
(water-cooled)
200 A continuous
Duty Cycle
200 A continuous
Duty Cycle
200 A continuous
Duty Cycle
200 A continuous
Duty Cycle
Torch Adjustments:
Lead/lag
+/- 5° +/- 10° +/- 10° +/- 10°
Cross-seam +/- 0.25"
(6,35 mm)
+/- 0.375"
(9,53 mm)
+/- 0.375"
(9,53 mm)
+/- 0.375"
(9,53 mm)
Tilt in / tilt out 15°/45° 15°/45° 15°/45° 15°/45°
Wire Feeder Integral, cable-
mounted
5 - 100 IPM
On-board
5 - 100 IPM
On -board
5 - 100 IPM
On-board
5 - 100 IPM
Wire Spool Size 2 lbs, (4") standard
0,9 kg, (101,6 mm) 
Low-profile standard
2 lbs., (4") optional
0,9 kg, (101,6 mm)
2 lbs, (4") standard
0,9 kg, (101,6 mm)
2 lbs, (4") standard
0,9 kg, (101,6 mm)
Filler Wire Size 0.030" or 0.035"
(0,75 mm or 0,9 mm)
0.030" or 0.035"
(0,75 mm or 0,9 mm)
0.030" or 0.035"
(0,75 mm or 0,9 mm)
0.030" or 0.035"
(0,75 mm or 0,9 mm)
Weight 11 lbs.
5 kg
14 lbs.
6,35 kg
16 lbs.
7,25 kg
22 lbs.
10 kg
Model 79 Series
Weld Head
Model #
Tube / Pipe
OD Range
Dimensions
A * B C R
79-2375 0.750" - 2.375"
19 mm - 61 mm
4.50" *
114 mm
16.25"
413 mm
0.63"
16 mm
3.43"
87 mm
79-3500 1.00" - 3.50"
25 mm - 90 mm
4.50" *
114 mm
19.25"
490 mm
0.63"
16 mm
4.25"
108 mm
79-4500 1.90" - 4.50"
48 mm - 114 mm
4.50" *
114 mm
19.25"
490 mm
0.63"
16 mm
5.25"
133 mm
79-6625 2.00" - 6.625"
50 mm - 170 mm
4.50" *
114 mm
19.25"
490 mm
0.63"
16 mm
6.31"
160 mm
* with cross-seam "in" all the way