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DC makes it easier to weld because of the constant DC level. AC goes from positive to negative 60 times a second, so it makes it harder to strike an arc and for a beginner to make a consistantly good weld. What electrode are you using? Some electrodes are designed for AC use, others are not. For example, 6011 is designed for AC or DC, but 6010 is DC only. Don't know anything about inverter welders. But I do know that for a long time I blamed my little AC crackerbox welder for not being able to make good welds. Then I went to welding school and discovered the problem was between my ears - not my equipment. I can now make as good of welds using my crackerbox AC machine as I can using the schools machine that costs much, much more. Find a competent welding shop (or school) in your area, show them what you're trying to do and ask for pointers. A good welder will be able to show you what you need to do to make good welds. It's possible that the problem is your welding machine or the wrong electrodes, or your technique. There's so many variables that it makes it kinda hard to diagnose over the internet. I hate to see you spend money on something that you don't need. Hope this helps, OK-AL
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