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Q:- When automatic or semiautomatic welding is used, which of the following shall be removed by grinding before welding over them?

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1. Surface Porosity Clusters
2. Bead Starts
3. High Points
4. All of the above
5. None of the above

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What is an active flux?

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1. A material used to clean surfaces of the joint through continued chemical reaction
2. A material used to protect the molten weld pool during welding
3. A material used to aid fusion
4. All of the above