Position Welding Pipe Now

Position welds are subject to rigorous non-destructive testing (NDT), specifically Radiographic Testing (RT) or Ultrasonic Testing (UT). Common defects specific to position welding include:

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

| Defect | Cause | Prevention | |--------|-------|-------------| | Sagging (overhead) | Excessive heat or fast travel | Reduce amperage; short arc length | | Lack of fusion (vertical) | Poor angle or excessive weave | Use stringer beads; maintain sidewall dwell | | Undercut | Excessive speed or high current | Reduce travel speed; adjust angle | | Slag inclusion | Inadequate cleaning between passes | Chip/grind thoroughly | The welder must balance voltage and amperage ("tuning

Unlike 1G welding, position welding demands physical agility. The welder must pivot around the pipe without disturbing the gun or electrode angle. Improper body positioning leads to "pushing" the angle in the overhead (causing lack of fusion) or "dragging" too much in the vertical (causing slag inclusions). Improper body positioning leads to "pushing" the angle

In the 5G position, the pipe axis is horizontal, but the pipe is fixed (cannot be rotated). The welder must weld around the entire circumference. This requires transitioning through three distinct gravitational planes: