0461235881 - ESAB A6 Mastertrac Twin Wire Submerged Arc Tractor with PEK

The Workhorse for Long Seam Welding

If you are welding heavy plate all day, the ESAB A6 Mastertrac SAW Twin PEK is the machine that takes the back-breaking labor out of the equation. This is a self-propelled Submerged Arc Welding tractor designed to run on tracks or directly on the workpiece, handling the heavy lifting so you can focus on the weld quality. The "Twin" in the name means it feeds two wires at once. This gives you a massive advantage in fill rate—you can lay down metal much faster than with a single wire, which is a game-changer when you are filling deep grooves on thick steel sections.

Controlling the beast is the PEK controller. Unlike older analog boxes with drifting knobs, the PEK is digital and precise. You dial in your amps, volts, and travel speed, and the machine holds them exactly where you want them. It has a clear display that lets you see what's happening even when the arc is buried under flux. The tractor itself is 4-wheel drive, so it doesn't slip or stall if the plate has a bit of a slope or if there's spatter on the track. It pulls the heavy cables and flux load without complaining.

Setup is straightforward. The slides are sturdy and don't wander once you lock them in. You can adjust the head for butt welds or fillet welds easily. The flux recovery system (usually an add-on or integrated) keeps the operation clean. For welders moving from manual or semi-auto MIG to full automation, the A6 Mastertrac is intuitive. It essentially acts as a steady hand that never gets tired, allowing you to produce perfect, uniform beads from one end of a 40-foot beam to the other. It’s reliable, tough, and built for the serious business of heavy fabrication.