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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?
1. Surface Porosity Clusters
2. Bead Starts
3. High Points
4. All of the above
5. None of the above
What is an active flux?
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