Welder Red Seal · Question
The '18' in the E7018 SMAW electrode classification primarily indicates what characteristic?
In the E7018 designation, the '1' indicates it is an all-position electrode, and the '8' specifies its coating type (low-hydrogen, iron powder) and the appropri
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Question: The '18' in the E7018 SMAW electrode classification primarily indicates what characteristic?
Answer options:
- The electrode contains 18% iron powder in its coating. ✅ It can be used with AC and DCEP polarities and has a low-hydrogen coating.
- The weld deposit has a minimum tensile strength of 180,000 psi.
- It is suitable for welding in the flat and horizontal positions only.
Correct answer: It can be used with AC and DCEP polarities and has a low-hydrogen coating.
Explanation: In the E7018 designation, the '1' indicates it is an all-position electrode, and the '8' specifies its coating type (low-hydrogen, iron powder) and the appropriate current (AC or DCEP). Low-hydrogen is the critical property for welding critical structures.
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