I am a novice welder at best but I have learned flux core splatters bad. I am running a Miller Multimatic and had been using flux core because the bottle was on my TIG machine. I was repairing gas caddies and decided I wanted the gas for shielding to help not go BOOM. It surprised me how big of a difference it made in quality and cleanliness of my welds. Flux core is nice where the bottle is very inconvenient to use but I am now a firm believer in using the shielding gas when possible.