Lincoln Aspect 375 Ac/Dc TIG Welder (K3945-1)

The Lincoln Aspect 375 AC/DC TIG Welder (K3945-1) is built for shops where TIG welds get tested, not just inspected: aerospace, motorsports, shipbuilding, education, and fabrication work that calls for a wide output range and a repeatable arc on critical joints.

Who it's for

This is a heavy-industrial machine, rated to 375A and set up for both single- and three-phase input from 200 to 600V. At 300A it runs a 60% duty cycle, giving it the stamina for longer production runs rather than occasional repairs. Lincoln's arc control here is tuned for fast response and stability, and Intellistart technology automatically softens the start on thin material while still providing enough heat to strike cleanly on thicker pieces.

Built-in controls

Auto Balance technology manages the mix of cleaning and penetration on aluminum automatically, while AC Wave Shape control lets an operator dial in frequency, balance, and offset by hand for critical aluminum work where the automatic setting isn't quite right. The unit ships as the power source only, at 105 lbs and roughly 21 by 11.8 by 25.5 inches, so a torch, cart, and consumables are sourced separately to match the job.

Common questions

Does this include a torch? No, this listing is the Aspect 375 power source only. What materials does it weld? Aluminum and mild steel, in both auto and manual AC control modes. As with most welding machines sold in California, this one carries a Proposition 65 warning.

Specifications