For MIG welding of steel, what flow rate range is recommended for shielding gas?

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Multiple Choice

For MIG welding of steel, what flow rate range is recommended for shielding gas?

Explanation:
Shielding gas flow rate is about how thickly the protective gas blankets the weld pool during MIG welding of steel. The best range to keep the weld safe from air contamination while avoiding problems from too much gas is 20–30 CFH. Too little gas allows air to contaminate the molten pool, causing porosity and oxidation; too much gas can create turbulence, drafts, or arc instability that can blow the shielding away and introduce defects. This 20–30 CFH window is a common general guideline, with adjustments only as needed for nozzle size, joint position, and gas mixture.

Shielding gas flow rate is about how thickly the protective gas blankets the weld pool during MIG welding of steel. The best range to keep the weld safe from air contamination while avoiding problems from too much gas is 20–30 CFH. Too little gas allows air to contaminate the molten pool, causing porosity and oxidation; too much gas can create turbulence, drafts, or arc instability that can blow the shielding away and introduce defects. This 20–30 CFH window is a common general guideline, with adjustments only as needed for nozzle size, joint position, and gas mixture.

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