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We did a few test tacks creating problems you might come across during set up. Starting from the left, this is a good tack. We have good penetration and the weld is nice and flat. Moving right is a low voltage situation; no penetration and the gun handle pushed back against our hand as we welded. Next, we have a no gas problem that you might encounter when you run out of shielding gas or welding outside in the wind. Lastly, we have a too much wire speed issue. The welder is just putting down too much so the weld is very tall above the surface. We still have good penetration, but this will waste wire, grinding discs, and your time.