Which one of the following statements is correct?
Option (A)
No flux is used in gas welding of mild steel
Option (B)
Borax is the commonly used flux coating on welding electrodes
Laser beam welding employs a vacuum chamber and thus avoids use of a shielding method
AC can be used for GTAW process
Correct Option:
Question Solution:
AC can be used GTAW. It is preferred for A1 and Mg because the cleaning action of AC removes oxides and improves weld quality.