Specifying a TIG Welding Machine for Steel Construction: 2026 Selection Map
For structural steel fabrication, specify an inverter DC or AC/DC TIG machine at 200–375 A with 40–60% duty cycle, HF arc start, and 99.99% argon shielding, matching the thicker base metal via the 1 A per 0.001 in. rule. Pick water-cooled torches above 200 A sustained and prefer AC/DC for shops hand
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