Mastery of 6G means mastery of all welding positions — and the discipline to inspect and adjust continuously, not just react to gravity.
A welder with 6G certification is qualified for all positions and is typically required for:
In welding certification, pipe welding positions are classified from 1G (horizontal rolled) to 6G (inclined fixed). The is widely considered the most difficult and most respected test for a pipe welder. It involves welding a fixed pipe inclined at a 45° angle, requiring the welder to transition through all other positions (flat, horizontal, vertical, and overhead) in a single, continuous weld.
| Defect | Most Likely Location | Cause | |---------|----------------------|--------| | Lack of fusion | 3:00 and 9:00 positions | Incorrect work angle | | Slag inclusion | 4:00–5:00 position (transition) | Puddle leading slag | | Undercut | 10:00–12:00 (overhead) | Excessive heat or fast travel | | Excessive reinforcement | 6:00 (bottom) | Gravity pulling puddle down | | Incomplete penetration | 12:00 (top) | Arc too short, too cold |
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