Lincoln Invertec STT II Multi Process Welder

Lincoln Invertec STT II Multi Process Welder

The Invertec STT II® is a revolutionary welding power source that uses Surface Tension Transfer® (STT) technology to achieve precise control of heat, penetration, and weld quality. Unlike traditional MIG, the STT process controls current rather than voltage, ensuring consistent welds with minimal spatter, smoke, and distortion.

Perfect for open root pipe welding, pressure vessels, stainless tanks, automotive, furniture, and thin material fabrication, the STT II offers a faster, more economical alternative to TIG—delivering welds up to three times faster without sacrificing quality. Its compatibility with mild steel, stainless steel, nickel alloys, and silicon bronze makes it an extremely versatile choice for both semi-automatic and automated applications.

Key Features

Surface Tension Transfer® (STT) Technology
Provides outstanding control of penetration, heat input, and weld bead profile — ideal for open root passes and thin materials with no burnthrough.

Low Spatter and Fume
By optimising current flow, STT reduces spatter and fumes significantly, even when using larger diameter wires and 100% CO₂ shielding gas.

Multi-Material Capability
Suitable for a wide range of consumables including mild steel, stainless steel, nickel alloys, and silicon bronze, providing flexibility across industries.

TIG Replacement Performance
Achieves TIG-like weld quality at up to 3x the travel speed, making it more productive and cost-efficient in many applications.

Heat Input Control
Independent control of background, peak, tailout, and hot start currents allows fine-tuning of weld quality, distortion, and penetration.

Cost Savings
Enables the use of 100% CO₂ shielding gas for carbon steel, reducing operating costs without compromising weld quality.

Open Root Welding Excellence
Delivers superior sidewall fusion, consistent back beads, and X-ray quality welds for applications such as pipelines and pressure vessels.

Durable and Reliable
Built with inverter technology and protected components, with electronic and thermostatic protection, backed by a three-year Lincoln warranty.