Due to the complexity of the position, specific defects are common in specific quadrants:

The root pass is the most scrutinized part of the 6G test.

As the welder progresses from the bottom (6 o'clock) to the top (12 o'clock) and around the sides, the weld joint orientation changes relative to the ground:

Because the pipe is inclined, the effective weld angle changes continuously as you orbit around. The welder must constantly adjust:

Success in 6G welding is determined by the welder's ability to execute the Root Pass, Hot Pass, Fill, and Cap in a fixed constraint.