Hi qa
I assume you are referring to ASME IX welder qualifications. (Let me know if I am wrong!)
Firstly, 6G is only a pipe test position. There is no plate 6G position. Also, welding in one of the test positions (1G, 2G - 6G) does not qualify you for welding any other test position. Rather, a test position qualifies the welder to weld in certain production positions. Thes positions are: Flat(F), Horizontal(H), Vertical(V), and Overhead(O) If you are qualified in a 6G position, you are able to weld all production positions on pipe or plate.
In ASME IX, there is not really a differentiation between full and partial penetration welds where welder qualification is concerned. The only real differentiation is between groove and fillet welds. If a groove weld is to be welded, (see the definition in the definitions section of ASME IX) the welder will be qualified to weld to the deposited thickness he qualified. If he has a thicker base metal than his deposited metal thickness, but he only needs to deposit a partial penetration weld, then he would be qualified to do this as long as this deposited thickness falls within the range qualified.
Hope this helps.
Regards
Niekie Jooste
Fabristruct Solutions
6G qualification on pipe qualifies the welder to all position plate. Plate positions are as follows 1G, 2G, 3G, and 4G. There is no 6G plate qualification. (Doesn't exist) Just watch the thicknesses used.
My understanding is that full penetration welds qualify for both full and partial penetration welds while partial penetration welds only qualify for partial penetration welds. (Welder qualification only) My knowlege of D1.1 is a bit limited because I use a Canadian standard. (W47.1 and W59) They are very similar, but not the same.
Somebody correct me if I'm wrong.