If a welder be qualified with plate, he will be qualified to weld on pipes with 2 ⅞ O.D. and over in the related welding position according to ASME IX QW-461.9 – note 2.
Now, if a welder weld on 3 plates in 2G, 3G, and 4G positions, to be an ALL POSITION qualified welder, is he qualified to weld on 5G or 6G pipes with diameter 2 ⅞ O.D. and over?