Was trying to weld in a patch on a fender for the first time. Took my time and skipped around. I thought it was going well but when finished there was some major shrinkage along a vertical seam; I guess I didn't wait long enough. I tried tapping out the shrinkage but the mig welds cracked in a couple of spots. tried annealing them to stretch out the damage but it really didn't improve hte situation much. So I'm sending pout an SOS for advice. I have access to oxy/actelyne once my bottle comes back from a free fill up. Help "Oh Masters of Metal".