1F Welding Position Explained

Written By: Liam Bryant

The 1F welding position, or flat fillet weld, is a basic welding position commonly used for joining metal pieces with a fillet weld. It’s typically used where welders have easy access to the joint and can complete the weld in a flat, horizontal position.

welding positions

What is 1F Welding Position

As a certified welder, I’ve dealt with many different welding positions. From the overhead to vertical, each position has its own set of challenges and rewards. The 1F welding position, often known as the flat fillet weld, holds a unique place in this family.

The “1” in 1F indicates that the weld is being made in the flat position. This means that the face of the weld is approximately horizontal, and the axis of the weld is approximately horizontal as well.

The “F” in 1F stands for fillet weld, a triangular weld used to join two surfaces at right angles to each other. This type of weld is prevalent in several applications, including building structures, shipbuilding, and more.

Where Do You Use 1F Welding

1F welding position is commonly used where the welder can easily access the joint and manipulate the welding rod or gun without straining. I’ve found it useful in situations where it’s easiest to lay the piece being welded down flat, such as in automotive work, structural applications, and some types of manufacturing.

This position also comes in handy when working with heavier or larger pieces of metal that cannot be easily moved or tilted. The flat position allows for stable and comfortable welding, which leads to better quality welds.

Characteristics Of The 1F Welding Position

The 1F welding position is one of the simplest and most comfortable positions to work in. From my personal experience, several key characteristics define this position:


With the workpiece lying flat, this position offers excellent stability. It means that your hand and body aren’t strained, which leads to more accurate and higher-quality welds.


The 1F position offers superior access to the joint being welded. It allows for easy manipulation of the welding rod or gun.

Gravity Assistance

The flat position allows gravity to assist in creating the weld pool and forming the fillet weld. This means less worrying about metal drooping or sagging during welding.

What is the Qualification Range for 1F

Welding certification is a way to ensure that a welder is qualified to perform specific types of welds and in certain positions. When it comes to the 1F position, if a welder is certified in this position, they are qualified to weld in the flat (1F and 1G) and horizontal positions (2F and 2G) for fillet and groove welds.


The 1F welding position offers several advantages, particularly for beginners:

As one of the basic welding positions, 1F is relatively easy to learn and master. It’s often the first position taught in welding certification courses.

Since this position is comfortable and easy to work in, welders can usually work faster and more efficiently.

Thanks to the stability and accessibility of the 1F position, it often results in high-quality, strong welds.


However, the 1F welding position isn’t without its drawbacks:

This position is not suitable for all types of welding jobs. For instance, it’s not ideal for vertical or overhead welding positions.

The efficiency of the 1F position is highly dependent on the workspace. This position becomes less practical if the workpiece cannot be laid flat.

1G vs 1F Welding Positions

1G and 1F are both flat welding positions. However, the type of weld is a significant difference between the two. While 1F stands for a fillet weld in the flat position, 1G indicates a groove weld in the same position.

In my experience, both are necessary for different applications. 1G is typically used when fusing two pieces of metal along a common edge, forming a seam. On the other hand, 1F is more commonly used when joining two pieces at right angles.


Understanding the different welding positions and their applications is a must for a welder. The 1F welding position is a fundamental technique that offers a blend of simplicity, efficiency, and quality. While it may have limitations, mastering this position will undoubtedly equip you with a strong foundation in your welding career.