Welder Red Seal · Question
A welder is setting up for a DC SMAW weld. To achieve deep penetration for a root pass on thick material and to direct the heat primarily into the base metal, which polarity should be selected?
DCEN (Direct Current Electrode Negative), also known as straight polarity, concentrates approximately two-thirds of the arc heat on the workpiece, promoting dee
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Question: A welder is setting up for a DC SMAW weld. To achieve deep penetration for a root pass on thick material and to direct the heat primarily into the base metal, which polarity should be selected?
Answer options: ✅ Direct Current Electrode Negative (DCEN) / Straight Polarity
- Direct Current Electrode Positive (DCEP) / Reverse Polarity
- Alternating Current (AC)
- Pulsed Direct Current (PDC)
Correct answer: Direct Current Electrode Negative (DCEN) / Straight Polarity
Explanation: DCEN (Direct Current Electrode Negative), also known as straight polarity, concentrates approximately two-thirds of the arc heat on the workpiece, promoting deep penetration, which is ideal for root passes. DCEP (Direct Current Electrode Positive) concentrates two-thirds of the heat on the electrode, resulting in less penetration.
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