A welder is conducting a fillet weld using FCAW-S in the vertical-down (3F-down) position on 6 mm (1/4 in) steel plate. To control the molten weld puddle and ensure proper fusion, which adjustment technique is most critical?

Question: A welder is conducting a fillet weld using FCAW-S in the vertical-down (3F-down) position on 6 mm (1/4 in) steel plate. To control the molten weld puddle and ensure proper fusion, which adjustment technique is most critical?

Answer options:

• Maintaining a consistent push angle of 10-15 degrees
• Using a slightly higher voltage setting than flat position welding
• Increasing the wire stick-out to cool the puddle ✅ A fast travel speed coupled with a steep electrode angle

Correct answer: A fast travel speed coupled with a steep electrode angle

Explanation: For vertical-down welding with FCAW-S, a fast travel speed combined with a steep electrode angle (dragging the gun, sometimes referred to as 'peep-show' welding) is critical to control the rapidly moving puddle and prevent slag inclusions or lack of fusion. A push angle is typically for vertical-up or flat, and a short stick-out is generally preferred for FCAW-S.