| Feature | 6G (Open Root) | 6GR (Restricted Root) | 2G (Horizontal) | | :--- | :--- | :--- | :--- | | | 45° Fixed | 45° Fixed | Horizontal (0°) | | Root Type | Open (Gap) | Restricted Ring | Fixed plate/pipe | | Difficulty | High | Extreme | Moderate | | Failure Point | Lack of fusion/penetration | Burn-through or lack of fusion to ring | Slag inclusion | | Common Use | Structural Pipelines | Refineries & Boilers | Structural plates |
How the test is bent:
A 6GR PDF will have:
When a welder takes a 6GR qualification test, they are typically presented with a specific setup that differs from a standard 6G pipe test. 6gr welding position pdf