My harbor freight welder (vulcan) i have used to mig weld 2 bikes from plans on this site so far. First was all c02 and HF welding wire, the 2nd bike was c02/argon. I did a few different break tests and the welds were good. Apparently the Vulcan line was designed by a former employee from miller or hobart, if i remember.
HF has improved their quality a lot over the years, their prices have gone up also, but with the warranty being a no questions asked not matched by any other manufacturer, they are definitely qork looking into some reviews and watching some videos for opinions. Below is the review that really caught people off guard, its for HF generators vs Honda, which are the gold standard in my opinion.