Tag: TIG shielding gas
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TIG Post-Flow Setting Troubleshooting: Black Tungsten, Porosity, Gas Waste, and Torch Cooling
TIG post-flow is the shielding gas that keeps flowing after the arc stops. If it is too short, the hot tungsten and cooling weld crater are exposed to air, causing black, blue,…
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TIG Shielding Gas Coverage Troubleshooting: Porosity, Soot, Tungsten Color, and Cup Setup
Poor TIG shielding gas coverage shows up as porosity, gray or black weld color, dirty tungsten, unstable arc starts, sugaring on stainless, and oxidation around the bead. The most common causes are…
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Why TIG Tungsten Turns Black Even When the Weld Looks Clean
TIG tungsten turning black is usually a shielding problem, not a mystery tungsten problem. The weld may still look acceptable at first, but a darkened electrode, unstable arc, dull bead edge, or…