Welder Red Seal · Question
What does the '1' in the SMAW electrode classification E7018-1 H4R indicate?
The '-1' suffix in an electrode classification like E7018-1 indicates that the weld metal meets requirements for improved impact toughness at lower temperatures
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Question: What does the '1' in the SMAW electrode classification E7018-1 H4R indicate?
Answer options:
- The electrode is suitable for all positions ✅ The electrode offers improved toughness at low temperatures
- The electrode contains 1% molybdenum
- The electrode is designed for flat position only
Correct answer: The electrode offers improved toughness at low temperatures
Explanation: The '-1' suffix in an electrode classification like E7018-1 indicates that the weld metal meets requirements for improved impact toughness at lower temperatures (-46°C) compared to a standard E7018.
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