Unlike open-root 6G (which uses a 3/32” gap), 6GR often uses a tight gap (1/16" or less). You are welding , not through a gap.

| 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 |

❌ Even skilled 6G welders fail 6GR without practice. ❌ Physical demand: Awkward torch angles cause fatigue. ❌ Limited visibility: The ring blocks the weld puddle from direct view; relies on feel/mirror. ❌ Higher cost: Test coupons and restriction rings add expense.