I have a Miller 170, am self taught with the help of some coaching from some industrial maintenance friends. I currently run gas with my rig and plan to build a 5 by 8 foot trailer using 2 inch by 3/16 inch angle (will use lap joints for maximum weld surface area). I have been told that I will get better penetration if I switch to flux core for this project. The trailer will carry my motorcycle and the last thing I want to see, is it fall apart going down the road (not to mention otherís safety).

Any suggestions, weld with the gas or switch to flux core? Is there a significant difference in penetration? Any help would be appreciated. Thanks
This will be my first BIG project.