Because the pipe is stationary, the welder must move the electrode or torch around the entire circumference of the pipe in a single continuous motion.
Welder qualification tests for 5G (per ASME Section IX, API 1104, or AWS D1.1) typically require: welding 5g position
The "5" indicates the position type (fixed pipe), and the "G" stands for (though it is often used generically for pipe welding). Because the pipe is stationary, the welder must
The pipe is fixed horizontally with a tolerance of +/- 15º. 12 o'clock (Flat) | 3 o'clock--+--9 o'clock (Vertical)
12 o'clock (Flat) | 3 o'clock--+--9 o'clock (Vertical) | 6 o'clock (Overhead)
Due to the changing positions, defects often occur at the transition points (roughly the 2 o'clock and 10 o'clock marks, or at the bottom).
| Clock position | Weld orientation | Technique adjustment | |----------------|------------------|----------------------| | 6:00 – 7:30 | Overhead | Short arc length; fast freeze rod; push slightly. | | 7:30 – 9:00 | Overhead → Vertical | Increase tilt; keep puddle small. | | 9:00 – 10:30 | Vertical | Whip or weave; watch for undercut on edges. | | 10:30 – 12:00 | Vertical → Flat | Widen weave; increase deposition. |