TIG orbital welding machine SX122 AVC / OSC

automaticfor pipesfor stainless steel

Overview
The SX122 AVC / OSC is a prefabrication orbital TIG welding machine engineered for high-precision, repeatable welds on tube assemblies. Integrated Arc Voltage Control (AVC) and Oscillation (OSC) stabilise arc length and enable controlled multi-pass welds on steels and exotic alloys. The system is intended for workshop prefabrication and is compatible with SAXX-210 AVC/OSC and SAXX-300 AVC/OSC power sources to reduce on-site work and installation errors.

Key data

• DESCRIPTION: SX122 AVC / OSC system
• Part No.: SX122-NAOF
• Tube OD range: 0.5″–4.5″ / 12–119 mm
• Cooling system: Water-cooled
• Functions: Orbital TIG welding with AVC / OSC

Product advantages

• Orbital TIG with AVC / OSC for precise arc control and consistent weld quality
• Arc Voltage Control (AVC) maintains constant electrode-to-tube distance automatically
• Oscillation (OSC) enables controlled multi-pass welding and uniform bead profiles
• Suitable for thick-wall tubes up to 12.7 mm (0.5″) for demanding industrial applications
• Motorized axial sweep ±10 mm (0.39″) for accurate electrode positioning
• Concentric clamping system minimises tube distortion and ensures alignment
• Automatic orbital rotation provides uniform penetration around the circumference
• Stainless steel clamping jaws protect internal surfaces and prevent contamination
• Compatible with steels and exotic alloys, including stainless steel and high‑purity materials
• Powered by SAXX sources (SAXX-210 AVC/OSC or SAXX-300 AVC/OSC) for reliable prefabrication welding
• Multi-function: welding, cutting and beveling with fast changeover using two setting screws
• Designed for workshop prefabrication to reduce on-site work, installation time and rework

What is AVC/OSC?
Motorized arc voltage control: AVC
AVC automatically adjusts arc tension to maintain a consistent electrode-to-tube distance during welding. This is critical for multi-pass orbital TIG to preserve arc height and avoid touching the weld pool.

The two most common applications:

• When mechanical OD gauging is not used: AVC provides contactless tracking with higher precision and faster response than mechanical followers.
• When welding with filler wire and deposition under the electrode varies: AVC prevents the electrode from contacting the weld pool.

Orbital TIG with AVC + OSC + filler wire
Mechanised multi-pass sequences combine AVC, torch oscillation and wire feed to fill beveled joints on thicker-walled tubes. Typical sequences include root, one or more fill passes, and a cap pass. Oscillation during rotation improves wire deposition efficiency and uniform fusion on both sides of the joint.

Videos
Product video demonstrates orbital TIG multi-pass welding with AXXAIR's AVC/OSC system.

Technical specifications

• Model: SX122 AVC / OSC system
• Part No.: SX122-NAOF
• Tube OD range: 0.5 – 4.5″ / 12 – 119 mm
• 100% duty cycle: 200 A
• Electrode diameter: 1/16″ or 3/32″ (1.6 or 2.4 mm)
• Cooling: Water-cooled
• Max operating temperature: 40 °C / 104 °F
• Max acoustic radiation: < 70 dB
• Unit weight: 46 kg / 101 lbs
• Motorized axial sweep (OSC): ±10 mm (0.39″)
• Concentric clamping, automatic orbital rotation, stainless steel clamping jaws
• Compatible with steels and exotic alloys