Which of the following types of electrical currents is commonly used in arc welding?
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A.
Only Alternating Current (AC)
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B.
Only static electricity
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C.
Both AC and DC, depending on the welding process and material
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D.
Only Direct Current (DC)
Correct Answer:
C. Both AC and DC, depending on the welding process and material
Explanation:
Both alternating current (AC) and direct current (DC) are utilized in arc welding, with the choice depending on the specific welding process, the type of electrode, and the properties of the base metal. For instance, processes like Gas Metal Arc Welding (MIG) and Flux-Cored Arc Welding typically employ DC, whereas Shielded Metal Arc Welding (stick) and Gas Tungsten Arc Welding (TIG) can function with either current type. DC generally provides a more stable arc and better penetration, while AC is often preferred for welding non-ferrous metals like aluminum to help break up surface oxides.
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