Pipe welding positions like 5G and 6G refer to welding pipes in fixed positions without rotating them.
In 5G, the pipe is horizontal and the welder moves around it, while in 6G the pipe is fixed at an angle (usually 45°).
6G is the most difficult position, requiring high skill and control.

Pipe Welding Positions (5G, 6G)

Pipe welding positions 5G and 6G are advanced welding positions used mainly for cylindrical pipes, especially in industries like oil & gas, power plants, and pipelines. These positions are more complex than plate welding because the welder must work around the pipe.

Let’s understand both in detail.

What does “G” mean?

G = Groove weld
Used for joining pipes with a groove (butt joint)

1. 5G Welding Position (Fixed Horizontal Pipe)

Definition

In 5G position, the pipe is kept horizontal and fixed, and the welder welds around it without rotating the pipe.

Orientation

Pipe axis → horizontal
Pipe → cannot rotate
Welder moves around the pipe

Welding Positions Involved

While welding in 5G, the welder encounters multiple positions:

Bottom → Flat position
Sides → Vertical position
Top → Overhead position

👉 So, 5G is a combination of 1G, 3G, and 4G

Characteristics

Continuous welding around pipe
Position changes during welding
Requires good skill and control

Challenges

Gravity affects molten metal differently at each point
Maintaining uniform weld quality is difficult

Applications

Pipeline welding
Oil and gas industries
Structural pipe systems

2. 6G Welding Position (Inclined Pipe)

Definition

In 6G position, the pipe is fixed at an inclined angle (usually 45°), and welding is done all around it.

Orientation

Pipe axis → inclined (~45°)
Pipe → fixed (cannot rotate)

Welding Positions Involved

Flat
Horizontal
Vertical
Overhead

👉 Combines all welding positions

Characteristics

Most complex welding position
Continuous change in angle and position
Requires full control over welding technique

Challenges

Constant adjustment of hand position and electrode angle
Gravity affects weld pool in every direction
High skill and experience required

Applications

Critical pipelines
Pressure vessels
Offshore and aerospace industries

Importance of 6G Position

Considered the highest level of welding skill
Used for welder certification tests
If a welder qualifies in 6G → can weld in all other positions

Comparison: 5G vs 6G

Feature	5G	6G
Pipe Position	Horizontal	Inclined (45°)
Pipe Movement	Fixed	Fixed
Difficulty	Very high	Extremely high
Positions Involved	Flat + Vertical + Overhead	All positions
Skill Level	Advanced	Expert