I attended a hammer in last June and watched Steve King use sand as flux on a damascus billet. It welded fine and didn't seem to affect the pattern so I know it's possible. Trattoclip, I'm not sure why you would use silica sand, we mix silica sand with brick cement for chimney flews and such because it won't melt and break down the mortar. It is available at Lowe's and other home improvement stores with the cement products.
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