In welding, 1G, 2G, 3G, 4G, 5G, and 6G are standardized position codes used to evaluate a welder’s skill. The number identifies the orientation of the joint, while the letter “G” indicates a groove weld.
These positions progress from the simplest flat weld to complex pipe welding positions, ensuring welders can perform quality welds in real-world conditions.
What Does “G” Mean in Welding?
- G = Groove weld
- Used where two metal pieces are joined with a groove joint
- Common in structural steel, pressure vessels, and pipelines
Plate Welding Positions (1G–4G)
1G — Flat Position
Difficulty: Easy
- Workpiece lies flat
- Welding performed from above
- Gravity assists weld pool control
👉 Ideal for beginners.
2G — Horizontal Position
Difficulty: Moderate
- Plate is vertical
- Weld runs horizontally
- Requires control to prevent sagging
3G — Vertical Position
Difficulty: Challenging
- Weld runs vertically
- Requires control of molten metal
- Can be vertical-up or vertical-down
4G — Overhead Position
Difficulty: Advanced
- Welding performed from underside
- Gravity pulls molten metal downward
- Requires strong technique and control
Pipe Welding Positions (5G & 6G)
5G — Horizontal Fixed Pipe
Difficulty: Advanced
- Pipe is horizontal and fixed
- Welder moves around pipe
- Includes flat, vertical, and overhead welding
6G — 45° Fixed Pipe Position
Difficulty: Expert (most challenging)
- Pipe fixed at a 45° angle
- Requires welding in all positions
- Tests complete positional welding ability
👉 Widely used for pipeline and high-pressure systems certification.
Difficulty Progression
| Position | Orientation | Difficulty |
|---|---|---|
| 1G | Flat | Beginner |
| 2G | Horizontal | Intermediate |
| 3G | Vertical | Advanced |
| 4G | Overhead | Advanced |
| 5G | Fixed pipe | Expert |
| 6G | 45° pipe | Master level |
Why Welding Positions Matter
These positions are essential because they:
✔ Test welder skill and certification standards
✔ Prepare welders for real-world job conditions
✔ Ensure strong welds in structural applications
✔ Maintain safety in pipelines and pressure systems
Many industries require certification in multiple positions.
Where These Positions Are Used
- Structural steel construction
- Shipbuilding and fabrication
- Oil & gas pipelines
- Power plants and pressure systems
- Industrial equipment manufacturing
Different projects require different welding positions.
Summary
The welding positions 1G through 6G are standardized codes representing joint orientation and welding difficulty. The number indicates the position, and “G” signifies a groove weld. These positions progress from flat plate welding (1G) to complex inclined pipe welding (6G), ensuring welders can produce strong, high-quality welds across structural, industrial, and pipeline applications.
Mastery of these positions is essential for certification and professional welding competence.