Welder Red Seal · Question
A welder is setting up for FCAW-G on 10 mm (3/8 in.) thick mild steel using an E71T-1M flux-cored wire. If they notice excessive spatter and an unstable arc, what adjustment is most likely needed to resolve these issues?
Excessive spatter and an unstable arc in FCAW-G often indicate that the voltage is too high for the given wire feed speed (amperage). Decreasing the voltage wil
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Question: A welder is setting up for FCAW-G on 10 mm (3/8 in.) thick mild steel using an E71T-1M flux-cored wire. If they notice excessive spatter and an unstable arc, what adjustment is most likely needed to resolve these issues?
Answer options:
- Increase the wire feed speed (WFS) ✅ Decrease the voltage
- Switch to electrode negative (DCEN) polarity
- Increase the stick-out (electrode extension)
Correct answer: Decrease the voltage
Explanation: Excessive spatter and an unstable arc in FCAW-G often indicate that the voltage is too high for the given wire feed speed (amperage). Decreasing the voltage will help to stabilize the arc and reduce spatter. Increasing WFS or stick-out, or switching polarity, would likely worsen the problem or cause other issues.
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