Just read a reply from HAWK that stated 6010 1/8 inch rod for first pass, then followed with 7018 1/8 inch rod for filler and cover pass, is the acceptable way to do a pipe weld cert. test. To my understanding, (in the field, natural gas pipe) you are to use 6010 rod, all the way out to the cap weld, using 100% downhand (downhill) welding. 7018 rod would need to be done vertical (uphill). Any feed-back from you experienced pipe welders?
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6010 and 7018 rod for pipe