1G Welding Position Explained

Written By: Liam Bryant

The 1G welding position is the most straightforward, involving a flat welding technique on a horizontal joint. Used predominantly in pipe welding, it requires the least effort and skill. However, the welder must master this position to qualify for more complex tasks.

welding positions

What is 1G Welding Position

A common welding position you’ll often encounter is the 1G welding position. ‘1G’ stands for ‘first position, groove weld.’ In the welding industry, this position involves a joint lying in a flat position. The ‘G’ in the 1G represents ‘groove’, indicating the type of joint to be welded.

In the 1G position, the pipe or plate to be welded lies flat and is not rotated or rolled during welding. The weld is made in the flat, horizontal plane, which is why this welding position is also often referred to as the flat welding position. This type of welding is a common starting point for novice welders because it’s the easiest to learn and master.

Where Do You Use 1G Welding

1G welding is used in a variety of situations. From my personal experience, it’s most commonly used in pipe welding tasks, particularly where the pipe is in a horizontal position and can’t be rotated. Think about pipelines in fixed positions or large pipes that are not easy to manipulate.

It is also commonly used in structural work, where you’re welding plates or other flat surfaces together. For instance, during the construction of bridges or buildings where large metal structures need to be joined, the 1G welding position comes in handy.

Characteristics Of The 1G Welding Position

In the 1G welding position, the welder has a lot of control. You can comfortably manipulate the electrode and make consistent welds due to the flat and stable position of the workpiece. The welding direction in this position is from left to right or right to left along the joint.

The molten metal stays in the joint due to gravity, which assists in creating a neat, uniform bead with less skill than overhead or vertical welding positions. As a welder, I’ve found that maintaining a steady travel speed and angle is critical in achieving a good 1G weld.

What is the Qualification Range for 1G

The 1G position is a basic welding position. As such, when a welder is qualified in this position, it usually only qualifies them for other flat welding positions. It does not qualify them for welding in the vertical or overhead positions, which are more difficult and require additional skills and certification. If you’re beginning your journey as a welder, mastering the 1G welding position is an essential first step towards advancing to other, more complex welding positions.


The 1G welding position has several advantages. I find that it is the easiest to learn and perfect because it requires less physical effort and skill compared to other positions. It also allows for faster welding speed, resulting in increased productivity. The stable position of the workpiece allows for excellent weld quality with little chances of imperfections like slag inclusions or porosity.


While 1G welding has its advantages, there are also some downsides. One of the main disadvantages is its limited application. As I mentioned earlier, this position is not often applicable in real-world scenarios where you can’t always have a flat surface or horizontal pipe to weld. Also, since it’s the easiest position, some welders may not feel challenged enough and might overlook the nuances of this technique, affecting their weld quality.

1G vs 1F Welding Positions

1G and 1F welding positions may seem similar, but they are different in several ways. 1F refers to ‘first position, fillet weld.’ The welder creates a weld at a 90-degree angle or an L-shaped joint between two metal pieces in this position.

In contrast, 1G is a groove weld position where you’re dealing with a joint in a flat position. While both are considered basic welding positions, 1G usually involves welding thicker plates or pipes, and 1F is often used for thinner, smaller pieces of metal.


The 1G welding position is a foundational and essential skill every welder must master. Although it might be basic, mastering this position gives you the grounding to tackle more complex welding positions and tasks.

Whether you’re a seasoned professional or just starting, a good understanding and skill level in 1G welding position is a valuable addition to your welding repertoire. It’s simple, efficient, and perfect for horizontal pipe welding and flat position jobs.

However, it’s essential to remember that it has limitations and is just the first of many positions you’ll need to learn to become a proficient welder.