the question of lincoln L56 wire

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my company uses L56 wire of lincoln .I=260-310A,U=28-32V, there are tawny things appeared after welding .my opinion they are SIO2 or others oxide .if dont grind it ,then the weld bead cant pass ut,so i want to ask what is it ? how to appear?
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Reply:It's the copperLast edited by Burpee; 02-14-2014 at 06:31 AM.Bubble gumTooth pixDuct tapeBlack glueGBMF hammerScrew gun --bad battery (see above)