When you combine these elements, the 4F position refers to performing an overhead fillet weld on a joint where two pieces of metal meet at an angle—typically a T-joint, lap joint, or corner joint—positioned directly above the welder's head.

Stands for Fillet weld, which joins two metal pieces at an angle (usually a T-joint or lap joint) 0.5.4 .

The primary challenge of the 4F position is . Unlike flat or horizontal welding, where gravity helps lay the filler metal, in 4F, gravity tries to make the molten metal sag or drip (known as "drooping" or "undercutting") 0.5.3 . Common issues include:

If you are asked to do a weld in the overhead position (technically a 4G position for plate, but often referred to as 4F when involving tube or structural members with root openings), the stakes are higher.

For larger or multi-pass welds, the order in which you lay down beads significantly affects the final result. A recommended sequence for a multi-pass 4F weld is: