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How long should the post-flow of shielding gas run?

Gas run SHIELDING
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How long should the post-flow of shielding gas run?

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(top) The post flow should last a second for every 10 amps of welding current. So if you are welding at 150 amps you should have approximately 15 seconds of post flow. The tungsten should be shiny or silvery in color after welding and not have a blue or black color.

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