You are right Gerald. The welder must weld using each process he is qualified for within a maximum six month period or lose the qualification. The maximum time that lapses between welding with each process cannot exceed six months. I worked in a shop years ago, and was qualified in the SMAW process, 2G, unlimited thickness. I was eventually moved into a management position in the office, but I didn't want to lose my qualification. From the day I was transferred, I always kept a date on my calendar marked every 5 1/2 months ahead, so I would remember to go out to the shop and get QC to witness me stick welding something so that I wouldn't lose my certification.
Brian: The welder's other qualification lapses unless the welder uses that other process within six months from the last time he used it.