Fillet Welding Positions [upd]

Here are the four primary positions you need to know.

[1F] Flat [2F] Horizontal [3F] Vertical [4F] Overhead ___ ___ | | ___ ___ \ | | / | | | | | \ | | / ____|____ ____|____ | ___________\|___|/___________ \ / \ / 1. 1F: Flat Position fillet welding positions

In the 1F position, the weld is made on the upper side of the joint, with the weld face approximately horizontal. Gravity is actually your friend here—it helps hold the molten puddle in place. Here are the four primary positions you need to know

| Position | Key Challenges | Typical Defects | |----------|----------------|------------------| | | Minimal; gravity helps | Undersize, lack of fusion (if poor technique) | | 2F | Uneven leg lengths; slag control | Underfill on vertical leg, overlap | | 3F | Molten metal sagging | Excessive convexity, undercut, cold lap | | 4F | Metal falls out | Burn-through, lack of fusion, drooping | Gravity is actually your friend here—it helps hold

Because the weld isn't "inside" a deep groove, the position of the gun and your body is critical to ensuring the "throat" of the weld is deep enough and the "legs" are even.

Today, we’re zooming in on the most common joint in the industry: the . Let’s break down the positions, the codes, and the techniques you need to master to conquer gravity every time.

Once you know where gravity wants to go, you know exactly how to stop it.