Point the tungsten directly into the root at a 45-degree work angle. Introduce the filler rod from the leading edge of the puddle.
A weld made in a groove between two members to be joined.
According to AWS A3.0 :
Use a foot pedal or torch amperage control to constantly back off the heat as the base metal saturates. 4f welding position full
One of the most interesting aspects of overhead stick welding (SMAW) is how the electrode behaves.
Stand to the side of the weld path rather than directly under it to avoid the "line of fire" for falling molten metal. 5. Common Issues and Fixes Problem Likely Cause Undercut Voltage too high or travel speed too fast Lower your heat; pause slightly at the edges of your weave. Overlap (Cold Lap) Travel speed too slow
Molten metal overflowing onto the base metal without actually fusing to it. Technical Specifications & Parameters Point the tungsten directly into the root at
In a 4F setup, the upper plate is typically positioned horizontally above the welder's head, while the intersecting plate hangs vertically downward, creating a 90-degree T-joint or lap joint. The welder must deposit metal upward into the joint. 4F vs. Other Positions
A 5 to 15-degree drag (backhand) angle is standard to help push the metal into the root. 3. Step-by-Step Execution Guide
: The study established a mathematical correlation between heat input and the resulting weld bead geometry (size, penetration, and dilution). According to AWS A3
To achieve high-quality welds in the 4F position, follow these best practices:
An interesting and highly relevant research paper on the 4F (overhead fillet) welding position is by Yaakub et al..
MIG welding in the 4F position requires precise control over wire feed speed and gas shielding.
The is officially defined as an Overhead Fillet Weld . This means the welder performs the weld from the underside of the joint, with the weld axis roughly horizontal, and the face of the weld lying in a horizontal plane. Gravity is the welder's primary enemy here, as molten metal wants to drip, sag, or fall onto the workpiece or the welder.
Horizontal plate (overhead, above welder)