A CWB certified welder is using a 1.2 mm (0.045 in) E71T-1M flux-cored wire with 75% Ar / 25% CO2 shielding gas for a heavy fabrication project. They observe inconsistent fusion at the toes of the weld and occasional undercut, primarily when welding in the horizontal (2F) position. Which adjustment is most likely to resolve these issues?

Question: A CWB certified welder is using a 1.2 mm (0.045 in) E71T-1M flux-cored wire with 75% Ar / 25% CO2 shielding gas for a heavy fabrication project. They observe inconsistent fusion at the toes of the weld and occasional undercut, primarily when welding in the horizontal (2F) position. Which adjustment is most likely to resolve these issues?

Answer options:

• Increasing the arc voltage
• Decreasing the travel speed
• Increasing the wire feed speed ✅ Adjusting the work angle to direct the arc more towards the vertical member

Correct answer: Adjusting the work angle to direct the arc more towards the vertical member

Explanation: Inconsistent fusion and undercut in a horizontal fillet (2F) with FCAW-G often indicates an improper work angle. Directing more arc energy towards the vertical member, typically by increasing the drag angle or adjusting the work angle slightly upward, helps ensure proper fusion and reduces undercut on the horizontal component by promoting better heat distribution and puddle control. Adjusting voltage or travel speed without addressing the angle may not fully resolve the problem.