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

Upset butt welding
Seam welding
Spot welding
Flash butt welding

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Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder to the positive terminal

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