Esteemed Ron, Howard said:
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just tig the pits, file to surface correction and blue
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He indicates that the welds must be filed down. Evidently, in his experience there is no need to file the pits beforehand as the heat of welding takes care of any iron oxides in the pits. I would think this would be a function of how deep and large the pit is, with some clean up of a larger pit being necessary to assure a clean weld without any cratering or blow out. Just a thought.
Other Ron