The welding is performed from the underside of the joint.
Identical to 6G, but with a restriction ring placed near the weld joint to limit access. This simulates tight spaces in refineries or nuclear plants. It is widely considered the hardest welding test to pass. weld positions chart
The pipe is horizontal and rotates while the welder stays in one spot (essentially a flat weld). The welding is performed from the underside of the joint
A welding position is the orientation of the weld joint relative to the welder and the ground. Because gravity is a constant force, the position of the metal dictates how the molten weld pool behaves. weld positions chart