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Workshop Technology

Q1: In welding copper alloys with TIG arc welding

A direct current with straight polarity is used

B direct current with reversed polarity is used

C alternating current is used

D any one of these

ANS:A - direct current with straight polarity is used

Explanation: Direct current with straight polarity (DCEN) is used when TIG welding copper alloys, the electrode is positive and the workpiece is negative. This polarity is preferred when welding copper alloys because it creates a stable arc with a deep and concentrated heat at the point of contact between the electrode and the workpiece, which helps to achieve a consistent weld.



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