7014 vs 7018 and surface prep.

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Hi allPlease forgive me if this question has been answered to many times or if it is a nonsensical question.Clearly we would want to have the surface as clean as possible with any type of electrodeBut i seem to have picked up that 7014 demands clean well prepared surfaces for a good weld But 7018 is more forgiving. Is this true?And what of 7024? is it also "forgiving" when it comes to surface prep?
Reply:No they are all about the same, and they are all somewhat tolerant of scale. However for best results you should clean off the mill scale with a grinder. No other cleaning is needed and no need for acetone or anything crazy.Miller Multimatic 255
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