Doesn't matter how much you grind it. Its still not good metal.In reality, is the cost of a couple of grinding discs excessive? because by the time you've bodged the job and done it again it will have cost you more in time alone, than the cost of a couple of grinding discs and a few minutes cleaning.
you think 6013 is a bad rod wait till you try 6011 /you will blast holes in everything , then reluctantly take it to the local blacksmith in yer brand new fendt and whinge about the priceIts sorted now. I just seen youtube videos that something like a 6011 would burn into it better than a filler rod like 6013 and wondered would it be worth while getting some for future.