Welder Red Seal · Question
What is the primary function of the slag produced by the flux on an SMAW electrode like an E7018?
The slag solidifies over the molten weld pool, forming a barrier that shields it from oxygen and nitrogen in the atmosphere as it cools, preventing porosity and
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Question: What is the primary function of the slag produced by the flux on an SMAW electrode like an E7018?
Answer options:
- To add alloy elements to the weld pool ✅ To protect the cooling weld metal from atmospheric contamination
- To increase the electrical conductivity of the arc
- To create a visible guide for the welder to follow
Correct answer: To protect the cooling weld metal from atmospheric contamination
Explanation: The slag solidifies over the molten weld pool, forming a barrier that shields it from oxygen and nitrogen in the atmosphere as it cools, preventing porosity and embrittlement.
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