Lincoln TIG Welders

TIG welding — formally Gas Tungsten Arc Welding (GTAW) — uses a non-consumable tungsten electrode to generate the arc while filler metal is added separately by hand, shielded by 100% argon gas. Because the electrode doesn't melt, the operator controls heat input, puddle size, and filler addition independently, making TIG the most precise common arc process. See the full TIG welder buyer's guide for AC/DC selection and model comparisons.

A TIG welder is a constant-current power source built for precise low-amperage GTAW output. DC-only machines weld steel, stainless, and most non-ferrous alloys; AC/DC machines add aluminum and magnesium capability. Professional inverter-based TIG welders add high-frequency arc start, pulse, and adjustable AC balance for fine aluminum control.

TIG welding aluminum requires AC output to break down the refractory oxide layer that forms on the surface before the arc can fuse the base metal. Use 100% argon shielding gas at 18–25 CFH, ER4043 or ER5356 TIG filler rod, and pure or 2% ceriated tungsten balled at the tip. Push the torch rather than dragging it, and preheat aluminum thicker than 3/16" to offset its high thermal conductivity.