Welder Red Seal · Question
A pressure vessel requires a full penetration groove weld on a 20 mm thick carbon steel pipe in the 5G position. The root pass will be done with an E6010 electrode, and subsequent passes with E7018. Which polarity is typically used for each of these electrodes in this application?
Both E6010 and E7018 electrodes are typically used with DCEP (Direct Current Electrode Positive) for their deep penetration and good arc stability characteristi
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Question: A pressure vessel requires a full penetration groove weld on a 20 mm thick carbon steel pipe in the 5G position. The root pass will be done with an E6010 electrode, and subsequent passes with E7018. Which polarity is typically used for each of these electrodes in this application?
Answer options:
- E6010: DCEN, E7018: DCEN ✅ E6010: DCEP, E7018: DCEP
- E6010: AC, E7018: DCEP
- E6010: DCEP, E7018: DCEN
Correct answer: E6010: DCEP, E7018: DCEP
Explanation: Both E6010 and E7018 electrodes are typically used with DCEP (Direct Current Electrode Positive) for their deep penetration and good arc stability characteristics, especially in out-of-position welding and for structural applications. DCEN would result in shallower penetration and a cooler weld.
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Question explanations
- A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies
- A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The weld
- A structural steel fabricator is using FCAW-S (E71T-8 wire) to weld heavy sections of structural steel in an o
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