Workshop Technology
The welding process used in joining mild steel shanks to high speed drills, is

Flash butt welding
Upset butt welding
Spot welding
Seam welding

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Workshop Technology
Notching is the operation of

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

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