Welder Red Seal · Question
In a complete joint penetration (CJP) groove weld on a butt joint, what is the purpose of a root opening?
The root opening is a specified gap between the parts at the bottom of the groove. It is essential for achieving complete joint penetration by allowing the elec
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Question: In a complete joint penetration (CJP) groove weld on a butt joint, what is the purpose of a root opening?
Answer options:
- To decrease the amount of filler metal required
- To provide a space for slag to be trapped ✅ To ensure the electrode can reach the bottom of the joint for full fusion
- To reduce the overall width of the weld
Correct answer: To ensure the electrode can reach the bottom of the joint for full fusion
Explanation: The root opening is a specified gap between the parts at the bottom of the groove. It is essential for achieving complete joint penetration by allowing the electrode and arc to reach the root of the joint and ensure fusion through the full thickness of the base metal.
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