1. Introduction: What is 6G? In the context of pipe welding, positions are standardized by the American Society of Mechanical Engineers (ASME) Section IX and the American Welding Society (AWS). The "G" stands for Groove weld .
| Position | Pipe Axis | Weld Location | Difficulty | | :--- | :--- | :--- | :--- | | (Rotated) | Horizontal | Flat (top only) | Easiest | | 2G (Fixed) | Vertical | Horizontal (side to side) | Moderate | | 5G (Fixed) | Horizontal | Vertical & Overhead | Difficult | | 6G (Fixed) | 45° Incline | All positions (Flat, Horizontal, Vertical, Overhead) | Most Difficult |
A pipe piercing through a wall at a 45° angle, sloping upward from left to right or right to left. The welder must move around the stationary pipe, welding overhead, vertical, horizontal, and flat—all within a single joint. 2. Why "6G"? Understanding the Position Numbering To appreciate 6G, compare it to other positions: