TIG Welding Machines

TIG welding machines (GTAW) strike an arc from a non-consumable tungsten electrode, with filler added separately, and give the cleanest and most controllable arc of the manual processes. Seven Star LLC supplies TIG welders in Oman from Miller, Kemppi, Migatronic and OTC Daihen. The listing includes DC machines for steel, stainless and nickel alloys, and AC/DC machines that also weld aluminum. Several of them double as stick welding power sources.

DC and AC/DC TIG welding machines

DC TIG with the electrode negative is used for carbon steel, stainless, duplex, nickel alloys, copper and titanium. It is the standard process for root passes on process piping and for thin-wall tube. Aluminum and magnesium need alternating current, because the electrode-positive half cycle breaks up the surface oxide while the negative half cycle provides penetration. AC/DC machines let the welder adjust the balance between cleaning and penetration, and usually the AC frequency as well, to narrow or widen the arc.

Features worth comparing on a TIG welder

Look at the minimum stable current for thin material and the maximum current at the duty cycle you need. High-frequency starting ignites the arc without touching the work. Lift starting avoids high-frequency interference and is preferred near sensitive electronics and instrumentation. Pulse reduces heat input and helps positional welding. Slope-up, slope-down and post-flow gas settings protect the weld start, the crater and the tungsten. Above a certain current, a water-cooled torch and cooler are more comfortable for continuous work.

What to send for a TIG machine quotation

Tell us the materials and thickness range, whether aluminum is included, the current and duty cycle required, the site supply, and the torch type, length and cooling. Mention remote controls such as a foot pedal. For projects elsewhere in the GCC, give the destination and any client specification.