Workshop Technology
In piercing operation, the clearance is provided on

Either on punch or die depending upon designer's choice
Punch
Die
Half on the punch and half on the die

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Workshop Technology
Spot welding is used for welding

Lap joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having thickness above 3 mm
Butt joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having thickness above 3 mm

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