Don't lock your knees. Stay loose. You need to be able to slide your body around the pipe smoothly. If you stop to reposition your body in the middle of the weld, you risk a "stop/start" defect. Move your feet before you run out of reach.
: A variant called 6GR adds a restriction ring near the weld, simulating real-world obstacles like walls or brackets, making it even harder by limiting the welder's reach. General Procedure (Uphill) position 6g welding
Most 6G certifications are done using or GTAW (TIG) , though FCAW is also common in structural settings. Here are the universal tips for success: Don't lock your knees