Workshop Technology
Spot welding is used for welding

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

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Workshop Technology
A progressive limit gauge has

'Go' member at one end and 'Not go' member at the other end
'Go' and 'Not go' member on the same side of the gauge
None of the listed here
Separate 'Go' and 'Not go' members

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