The fill and cap passes (F4) in a 4G SMAW weld use which electrode?

The fill and cap passes (F4) in a 4G SMAW weld use which electrode?

• A. 7018
• B. 6010
• C. 6011
• D. 7024

Answer: (A)

In the overhead position, you want an electrode that minimizes hydrogen in the weld and gives a stable, controllable bead for filling and shaping the cap. A low-hydrogen electrode fits this need well: it produces a ductile, strong weld and clean slag removal, which helps you build up the fill and finish the cap reliably in the 4G (overhead) weld. Other electrode types are less ideal for overhead fill and cap. Deep-penetrating, fast-freeze electrodes are great for root passes and all-position work, but they can leave slag and cracking risks higher in the overhead when you’re doing the final passes. Rutile-based, high-deposition electrodes are designed more for flat or horizontal work and can be harder to control and clean in overhead welds.

In the overhead position, you want an electrode that minimizes hydrogen in the weld and gives a stable, controllable bead for filling and shaping the cap. A low-hydrogen electrode fits this need well: it produces a ductile, strong weld and clean slag removal, which helps you build up the fill and finish the cap reliably in the 4G (overhead) weld.

Other electrode types are less ideal for overhead fill and cap. Deep-penetrating, fast-freeze electrodes are great for root passes and all-position work, but they can leave slag and cracking risks higher in the overhead when you’re doing the final passes. Rutile-based, high-deposition electrodes are designed more for flat or horizontal work and can be harder to control and clean in overhead welds.