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Questions and Answers
What is the area where the liquid metal mixes called in welding?
What is the area where the liquid metal mixes called in welding?
- Oxide layer
- Heat affected zone
- Weld pool (correct)
- Crystal structure
What happens to the grain size in the heat affected zone when the heat provided exceeds the recrystallization temperature?
What happens to the grain size in the heat affected zone when the heat provided exceeds the recrystallization temperature?
- It increases (correct)
- It becomes irregular
- It decreases
- It remains the same
What protects the weld pool in the weld bead?
What protects the weld pool in the weld bead?
- Weld pool
- Crystal structure
- Heat affected zone
- Oxide layer (correct)
What is the initial grain size of the base plate compared to the grain size in the heat affected zone?
What is the initial grain size of the base plate compared to the grain size in the heat affected zone?
What is the area surrounding the weld pool where the temperature gradually increases called?
What is the area surrounding the weld pool where the temperature gradually increases called?
What is the historical development of different welding power units?
What is the historical development of different welding power units?
What is the advantage of using AC for welding?
What is the advantage of using AC for welding?
What is the minimum Open Circuit Voltage (OCV) required for re-igniting the arc in AC welding?
What is the minimum Open Circuit Voltage (OCV) required for re-igniting the arc in AC welding?
What complication arises when introducing AC in welding?
What complication arises when introducing AC in welding?
What type of power unit is used at sites without a supply of mains electricity?
What type of power unit is used at sites without a supply of mains electricity?
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