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FWIW, the sugaring I have seen is from overheating. Overheating causes the carbon to precipitate from the SS. You can see this by taking a coupon of SS and running a bead using a little too much heat. Then run another bead with less heat. Depending on the thickness, you may be under 50 amps. If you can use pulse, you eill run cooler. Also, they make rods with an "L" designation, which designates low carbon.
Thanks for the tips guys, trust me there always welcome. I got more pictures of some tig jobs I just did, stay tuned. I back purged these welds.