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Although fairly straight, for carbon steel those welds will not be strong. You need to weld with your wrist, not your elbow. Think of the torch tip like that of a pencil or a crayon and that you are coloring in the void, use your wrist. Turn the heat up and turn the wire speed up on those welds. That's what I would want to see with a silicon bronze weld there.Rattler, did you turn the drive roller around? It's designed to clamp on the .023"-.025" only on the opposing side.
All a flux core welder is good for is the scrap metal pile!