The surface weld may be decent, but I would suspect inferior penetration. If the welds in question are for something where the strength matters , I would grind them out and redo them with correct gas. Its like a MIG weld, they can easily look good, but have insufficient strength due to a lack of pe...

Same kind of question: Material: 1018 and 1026 Electrode: 3/32 Gas lens on WP-17 torch. Filler: 3/32 ER70S-2 Base Thickness: 0.125 to 0.200 Current: Between 100 and 130A DCEN mode Outcome: Arc quickly spreads, doesn't remain a tight egg shape. Lots of brown-sugar around weld. Weld itself comes out g...