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.
| Position Type | Fillet Weld (F) | Groove Weld (G) | | :--- | :--- | :--- | | | 1F | 1G | | Horizontal | 2F | 2G | | Vertical | 3F | 3G | | Overhead | 4F | 4G | | Pipe Fixed Horizontal | N/A | 5G | | Pipe 45-Degree | N/A | 6G |
The system is simple once you break it down:
✅ Procedure qualification – Your WPS must match the position. ✅ Skill assessment – Passing a 3G test proves you’re not a beginner. ✅ Distortion control – Different positions affect heat input and shrinkage.
While the positions (Flat, Horizontal, Vertical, Overhead) remain the same, the designation changes based on the joint type.
The pipe is horizontal and stationary. The welder must perform flat, vertical, and overhead techniques in one continuous pass.
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.
| Position Type | Fillet Weld (F) | Groove Weld (G) | | :--- | :--- | :--- | | | 1F | 1G | | Horizontal | 2F | 2G | | Vertical | 3F | 3G | | Overhead | 4F | 4G | | Pipe Fixed Horizontal | N/A | 5G | | Pipe 45-Degree | N/A | 6G | weld positions chart
The system is simple once you break it down: Identical to 6G, but with a restriction ring
✅ Procedure qualification – Your WPS must match the position. ✅ Skill assessment – Passing a 3G test proves you’re not a beginner. ✅ Distortion control – Different positions affect heat input and shrinkage. | Position Type | Fillet Weld (F) |
While the positions (Flat, Horizontal, Vertical, Overhead) remain the same, the designation changes based on the joint type.
The pipe is horizontal and stationary. The welder must perform flat, vertical, and overhead techniques in one continuous pass.