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Hello, we need more info to give informed advice. If your using MIG your gun angles and how clean the base metal could be a place to start. Are you pushing or dragging your puddle ? What shielding gas are you using? How thick of base metal are you trying to weld. I assume your welding a lap joint or a inside corner ? all of these variables will have an effect on how good of a job you will be able to do.
I have a welding addiction
...the only stupid question is the one you didn't ask
Thats the one thing all of the welding vids that show how to weld alum don't show. They all show nice flat welds and how easy it is. Now you have a non textbook weld. If with mig and you have cleaned the alum and have enough heat to do the weld. I hold my gun just like welding in the flat at a 45 to the corner and tipped back about 10 degrees then i make little circles to keep everything flowing. Just my thought and how i do it yours may vary...Bob