Is It Possible To Weld Sheet Metal With A Wire Welder

I have a flux core wire welder. It has about 5 or 6 amperage settings. I tried welding some sheet metal together at the lowest setting, but it just blew a hole in the metal. I was just trying to practice, and it was really thin metal, but is my machine just going to be too strong to do it? I want to weld in rocker panels and cab corners on my truck.
I should add that I welded some 1/8 or 1/4 inch steel with it recently, and it worked fine. I barely touched the sheet metal and it blew right through it.

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