Looks like you are trying to weld through the galvanization, unless you burn it very hot, you will fail. A MIG won't help you either. But I wouldn't recommend welding the galv, as zinc fever sucks!!!! Just grind the parts to bare metal and you'll have better welds instantly. Also the only touch up I would recommend here is grinding everything out and starting over, those jacks need to carry a lot of weight.
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