Position welding refers to depositing weld metal around the circumference of a pipe that cannot be rolled or rotated. The welder must work in multiple orientations (flat, horizontal, vertical, and overhead) as they move around the pipe.
In position welding, heat input must be carefully controlled. Excessive heat in the overhead position causes the pool to fall out, while insufficient heat in the vertical position leads to lack of penetration. The welder must balance voltage and amperage ("tuning the machine") based on the specific arc length and manipulation required for that specific clock position on the pipe. position welding pipe