In the 2G position, the pipe axis is vertical, and the pipe is fixed. The welder deposits metal horizontally around the pipe. The primary challenge here is the tendency for the weld pool to sag due to gravity, potentially causing undercut at the top edge of the weld and overlap at the bottom.
| Process | Suitability | |---------|--------------| | | Excellent for field position welding; works well in 5G, 6G. | | GTAW (TIG) | Preferred for root pass in critical pipe (e.g., high-purity, alloy). | | GMAW (MIG) | Used with pulsed spray or short-circuit transfer; less common in difficult positions. | | FCAW | Good for vertical-up and overhead; high deposition. | position welding pipe
The 6G position is generally regarded as the most difficult test in pipe welding. The pipe axis is fixed at a 45-degree angle. The welder must combine the skills of 2G, 5G, and vertical plate welding. Because gravity acts on the weld pool at a complex angle, the welder must constantly adjust the torch angle and travel speed. Successfully passing a 6G test typically qualifies a welder to weld in all other positions. In the 2G position, the pipe axis is