Im using Outershield® 71M (E71T-1) flux-cored wire with 75Ar/25CO2. Why am I getting gas marks on the weld surface?
The fast freezing rutile slag on an E71T-1 Outershield® wire gives it excellent out-of-position characteristics, but can also trap gases under the slag as the weld solidifies, resulting in gas marks. Gas marks are more commonly observed welding at high procedures under a high Argon blend shielding gas.
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