Workshop Technology
In welding magnesium with TIG arc welding, direct current with ________ is used.

Straight polarity
None of these
Both (A) and (B)
Reversed polarity

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Workshop Technology
Lancing is the operation of

Removal of metal to the desired shape from the edge of a plate
Bending a sheet of metal along a curved axis
Cutting a sheet of metal through part of its length and then bending the cut portion
Cutting a sheet of metal in a straight line along the length

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